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sidewinder.c

/*
 *  Copyright (c) 1998-2005 Vojtech Pavlik
 */

/*
 * Microsoft SideWinder joystick family 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/slab.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/gameport.h>
#include <linux/jiffies.h>

#define DRIVER_DESC     "Microsoft SideWinder joystick family driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * These are really magic values. Changing them can make a problem go away,
 * as well as break everything.
 */

#undef SW_DEBUG
#undef SW_DEBUG_DATA

#define SW_START  600   /* The time we wait for the first bit [600 us] */
#define SW_STROBE 60    /* Max time per bit [60 us] */
#define SW_TIMEOUT      6     /* Wait for everything to settle [6 ms] */
#define SW_KICK         45    /* Wait after A0 fall till kick [45 us] */
#define SW_END          8     /* Number of bits before end of packet to kick */
#define SW_FAIL         16    /* Number of packet read errors to fail and reinitialize */
#define SW_BAD          2     /* Number of packet read errors to switch off 3d Pro optimization */
#define SW_OK           64    /* Number of packet read successes to switch optimization back on */
#define SW_LENGTH 512   /* Max number of bits in a packet */

#ifdef SW_DEBUG
#define dbg(format, arg...) printk(KERN_DEBUG __FILE__ ": " format "\n" , ## arg)
#else
#define dbg(format, arg...) do {} while (0)
#endif

/*
 * SideWinder joystick types ...
 */

#define SW_ID_3DP 0
#define SW_ID_GP  1
#define SW_ID_PP  2
#define SW_ID_FFP 3
#define SW_ID_FSP 4
#define SW_ID_FFW 5

/*
 * Names, buttons, axes ...
 */

static char *sw_name[] = {    "3D Pro", "GamePad", "Precision Pro", "Force Feedback Pro", "FreeStyle Pro",
                        "Force Feedback Wheel" };

static char sw_abs[][7] = {
      { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
      { ABS_X, ABS_Y },
      { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
      { ABS_X, ABS_Y, ABS_RZ, ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
      { ABS_X, ABS_Y,         ABS_THROTTLE, ABS_HAT0X, ABS_HAT0Y },
      { ABS_RX, ABS_RUDDER,   ABS_THROTTLE }};

static char sw_bit[][7] = {
      { 10, 10,  9, 10,  1,  1 },
      {  1,  1                 },
      { 10, 10,  6,  7,  1,  1 },
      { 10, 10,  6,  7,  1,  1 },
      { 10, 10,  6,  1,  1     },
      { 10,  7,  7,  1,  1     }};

static short sw_btn[][12] = {
      { BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_MODE },
      { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE },
      { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
      { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4, BTN_SELECT },
      { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_START, BTN_MODE, BTN_SELECT },
      { BTN_TRIGGER, BTN_TOP, BTN_THUMB, BTN_THUMB2, BTN_BASE, BTN_BASE2, BTN_BASE3, BTN_BASE4 }};

static struct {
      int x;
      int y;
} sw_hat_to_axis[] = {{ 0, 0}, { 0,-1}, { 1,-1}, { 1, 0}, { 1, 1}, { 0, 1}, {-1, 1}, {-1, 0}, {-1,-1}};

struct sw {
      struct gameport *gameport;
      struct input_dev *dev[4];
      char name[64];
      char phys[4][32];
      int length;
      int type;
      int bits;
      int number;
      int fail;
      int ok;
      int reads;
      int bads;
};

/*
 * sw_read_packet() is a function which reads either a data packet, or an
 * identification packet from a SideWinder joystick. The protocol is very,
 * very, very braindamaged. Microsoft patented it in US patent #5628686.
 */

static int sw_read_packet(struct gameport *gameport, unsigned char *buf, int length, int id)
{
      unsigned long flags;
      int timeout, bitout, sched, i, kick, start, strobe;
      unsigned char pending, u, v;

      i = -id;                                  /* Don't care about data, only want ID */
      timeout = id ? gameport_time(gameport, SW_TIMEOUT * 1000) : 0; /* Set up global timeout for ID packet */
      kick = id ? gameport_time(gameport, SW_KICK) : 0;     /* Set up kick timeout for ID packet */
      start = gameport_time(gameport, SW_START);
      strobe = gameport_time(gameport, SW_STROBE);
      bitout = start;
      pending = 0;
      sched = 0;

        local_irq_save(flags);                              /* Quiet, please */

      gameport_trigger(gameport);                     /* Trigger */
      v = gameport_read(gameport);

      do {
            bitout--;
            u = v;
            v = gameport_read(gameport);
      } while (!(~v & u & 0x10) && (bitout > 0));           /* Wait for first falling edge on clock */

      if (bitout > 0)
            bitout = strobe;                    /* Extend time if not timed out */

      while ((timeout > 0 || bitout > 0) && (i < length)) {

            timeout--;
            bitout--;                           /* Decrement timers */
            sched--;

            u = v;
            v = gameport_read(gameport);

            if ((~u & v & 0x10) && (bitout > 0)) {          /* Rising edge on clock - data bit */
                  if (i >= 0)                   /* Want this data */
                        buf[i] = v >> 5;        /* Store it */
                  i++;                          /* Advance index */
                  bitout = strobe;              /* Extend timeout for next bit */
            }

            if (kick && (~v & u & 0x01)) {                  /* Falling edge on axis 0 */
                  sched = kick;                       /* Schedule second trigger */
                  kick = 0;                     /* Don't schedule next time on falling edge */
                  pending = 1;                        /* Mark schedule */
            }

            if (pending && sched < 0 && (i > -SW_END)) {    /* Second trigger time */
                  gameport_trigger(gameport);         /* Trigger */
                  bitout = start;                     /* Long bit timeout */
                  pending = 0;                        /* Unmark schedule */
                  timeout = 0;                        /* Switch from global to bit timeouts */
            }
      }

      local_irq_restore(flags);                             /* Done - relax */

#ifdef SW_DEBUG_DATA
      {
            int j;
            printk(KERN_DEBUG "sidewinder.c: Read %d triplets. [", i);
            for (j = 0; j < i; j++) printk("%d", buf[j]);
            printk("]\n");
      }
#endif

      return i;
}

/*
 * sw_get_bits() and GB() compose bits from the triplet buffer into a __u64.
 * Parameter 'pos' is bit number inside packet where to start at, 'num' is number
 * of bits to be read, 'shift' is offset in the resulting __u64 to start at, bits
 * is number of bits per triplet.
 */

#define GB(pos,num) sw_get_bits(buf, pos, num, sw->bits)

static __u64 sw_get_bits(unsigned char *buf, int pos, int num, char bits)
{
      __u64 data = 0;
      int tri = pos % bits;                                 /* Start position */
      int i   = pos / bits;
      int bit = 0;

      while (num--) {
            data |= (__u64)((buf[i] >> tri++) & 1) << bit++;      /* Transfer bit */
            if (tri == bits) {
                  i++;                                /* Next triplet */
                  tri = 0;
            }
      }

      return data;
}

/*
 * sw_init_digital() initializes a SideWinder 3D Pro joystick
 * into digital mode.
 */

static void sw_init_digital(struct gameport *gameport)
{
      int seq[] = { 140, 140+725, 140+300, 0 };
      unsigned long flags;
      int i, t;

        local_irq_save(flags);

      i = 0;
        do {
                gameport_trigger(gameport);                 /* Trigger */
            t = gameport_time(gameport, SW_TIMEOUT * 1000);
            while ((gameport_read(gameport) & 1) && t) t--; /* Wait for axis to fall back to 0 */
                udelay(seq[i]);                             /* Delay magic time */
        } while (seq[++i]);

      gameport_trigger(gameport);                     /* Last trigger */

      local_irq_restore(flags);
}

/*
 * sw_parity() computes parity of __u64
 */

static int sw_parity(__u64 t)
{
      int x = t ^ (t >> 32);

      x ^= x >> 16;
      x ^= x >> 8;
      x ^= x >> 4;
      x ^= x >> 2;
      x ^= x >> 1;
      return x & 1;
}

/*
 * sw_ccheck() checks synchronization bits and computes checksum of nibbles.
 */

static int sw_check(__u64 t)
{
      unsigned char sum = 0;

      if ((t & 0x8080808080808080ULL) ^ 0x80)               /* Sync */
            return -1;

      while (t) {                               /* Sum */
            sum += t & 0xf;
            t >>= 4;
      }

      return sum & 0xf;
}

/*
 * sw_parse() analyzes SideWinder joystick data, and writes the results into
 * the axes and buttons arrays.
 */

static int sw_parse(unsigned char *buf, struct sw *sw)
{
      int hat, i, j;
      struct input_dev *dev;

      switch (sw->type) {

            case SW_ID_3DP:

                  if (sw_check(GB(0,64)) || (hat = (GB(6,1) << 3) | GB(60,3)) > 8)
                        return -1;

                  dev = sw->dev[0];

                  input_report_abs(dev, ABS_X,        (GB( 3,3) << 7) | GB(16,7));
                  input_report_abs(dev, ABS_Y,        (GB( 0,3) << 7) | GB(24,7));
                  input_report_abs(dev, ABS_RZ,       (GB(35,2) << 7) | GB(40,7));
                  input_report_abs(dev, ABS_THROTTLE, (GB(32,3) << 7) | GB(48,7));

                  input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
                  input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);

                  for (j = 0; j < 7; j++)
                        input_report_key(dev, sw_btn[SW_ID_3DP][j], !GB(j+8,1));

                  input_report_key(dev, BTN_BASE4, !GB(38,1));
                  input_report_key(dev, BTN_BASE5, !GB(37,1));

                  input_sync(dev);

                  return 0;

            case SW_ID_GP:

                  for (i = 0; i < sw->number; i ++) {

                        if (sw_parity(GB(i*15,15)))
                              return -1;

                        input_report_abs(sw->dev[i], ABS_X, GB(i*15+3,1) - GB(i*15+2,1));
                        input_report_abs(sw->dev[i], ABS_Y, GB(i*15+0,1) - GB(i*15+1,1));

                        for (j = 0; j < 10; j++)
                              input_report_key(sw->dev[i], sw_btn[SW_ID_GP][j], !GB(i*15+j+4,1));

                        input_sync(sw->dev[i]);
                  }

                  return 0;

            case SW_ID_PP:
            case SW_ID_FFP:

                  if (!sw_parity(GB(0,48)) || (hat = GB(42,4)) > 8)
                        return -1;

                  dev = sw->dev[0];
                  input_report_abs(dev, ABS_X,        GB( 9,10));
                  input_report_abs(dev, ABS_Y,        GB(19,10));
                  input_report_abs(dev, ABS_RZ,       GB(36, 6));
                  input_report_abs(dev, ABS_THROTTLE, GB(29, 7));

                  input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
                  input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);

                  for (j = 0; j < 9; j++)
                        input_report_key(dev, sw_btn[SW_ID_PP][j], !GB(j,1));

                  input_sync(dev);

                  return 0;

            case SW_ID_FSP:

                  if (!sw_parity(GB(0,43)) || (hat = GB(28,4)) > 8)
                        return -1;

                  dev = sw->dev[0];
                  input_report_abs(dev, ABS_X,        GB( 0,10));
                  input_report_abs(dev, ABS_Y,        GB(16,10));
                  input_report_abs(dev, ABS_THROTTLE, GB(32, 6));

                  input_report_abs(dev, ABS_HAT0X, sw_hat_to_axis[hat].x);
                  input_report_abs(dev, ABS_HAT0Y, sw_hat_to_axis[hat].y);

                  for (j = 0; j < 6; j++)
                        input_report_key(dev, sw_btn[SW_ID_FSP][j], !GB(j+10,1));

                  input_report_key(dev, BTN_TR,     !GB(26,1));
                  input_report_key(dev, BTN_START,  !GB(27,1));
                  input_report_key(dev, BTN_MODE,   !GB(38,1));
                  input_report_key(dev, BTN_SELECT, !GB(39,1));

                  input_sync(dev);

                  return 0;

            case SW_ID_FFW:

                  if (!sw_parity(GB(0,33)))
                        return -1;

                  dev = sw->dev[0];
                  input_report_abs(dev, ABS_RX,       GB( 0,10));
                  input_report_abs(dev, ABS_RUDDER,   GB(10, 6));
                  input_report_abs(dev, ABS_THROTTLE, GB(16, 6));

                  for (j = 0; j < 8; j++)
                        input_report_key(dev, sw_btn[SW_ID_FFW][j], !GB(j+22,1));

                  input_sync(dev);

                  return 0;
      }

      return -1;
}

/*
 * sw_read() reads SideWinder joystick data, and reinitializes
 * the joystick in case of persistent problems. This is the function that is
 * called from the generic code to poll the joystick.
 */

static int sw_read(struct sw *sw)
{
      unsigned char buf[SW_LENGTH];
      int i;

      i = sw_read_packet(sw->gameport, buf, sw->length, 0);

      if (sw->type == SW_ID_3DP && sw->length == 66 && i != 66) {       /* Broken packet, try to fix */

            if (i == 64 && !sw_check(sw_get_bits(buf,0,64,1))) {        /* Last init failed, 1 bit mode */
                  printk(KERN_WARNING "sidewinder.c: Joystick in wrong mode on %s"
                        " - going to reinitialize.\n", sw->gameport->phys);
                  sw->fail = SW_FAIL;                             /* Reinitialize */
                  i = 128;                                  /* Bogus value */
            }

            if (i < 66 && GB(0,64) == GB(i*3-66,64))              /* 1 == 3 */
                  i = 66;                                         /* Everything is fine */

            if (i < 66 && GB(0,64) == GB(66,64))                        /* 1 == 2 */
                  i = 66;                                         /* Everything is fine */

            if (i < 66 && GB(i*3-132,64) == GB(i*3-66,64)) {            /* 2 == 3 */
                  memmove(buf, buf + i - 22, 22);                       /* Move data */
                  i = 66;                                         /* Carry on */
            }
      }

      if (i == sw->length && !sw_parse(buf, sw)) {                      /* Parse data */

            sw->fail = 0;
            sw->ok++;

            if (sw->type == SW_ID_3DP && sw->length == 66               /* Many packets OK */
                  && sw->ok > SW_OK) {

                  printk(KERN_INFO "sidewinder.c: No more trouble on %s"
                        " - enabling optimization again.\n", sw->gameport->phys);
                  sw->length = 22;
            }

            return 0;
      }

      sw->ok = 0;
      sw->fail++;

      if (sw->type == SW_ID_3DP && sw->length == 22 && sw->fail > SW_BAD) {   /* Consecutive bad packets */

            printk(KERN_INFO "sidewinder.c: Many bit errors on %s"
                  " - disabling optimization.\n", sw->gameport->phys);
            sw->length = 66;
      }

      if (sw->fail < SW_FAIL)
            return -1;                                      /* Not enough, don't reinitialize yet */

      printk(KERN_WARNING "sidewinder.c: Too many bit errors on %s"
            " - reinitializing joystick.\n", sw->gameport->phys);

      if (!i && sw->type == SW_ID_3DP) {                          /* 3D Pro can be in analog mode */
            mdelay(3 * SW_TIMEOUT);
            sw_init_digital(sw->gameport);
      }

      mdelay(SW_TIMEOUT);
      i = sw_read_packet(sw->gameport, buf, SW_LENGTH, 0);              /* Read normal data packet */
      mdelay(SW_TIMEOUT);
      sw_read_packet(sw->gameport, buf, SW_LENGTH, i);                  /* Read ID packet, this initializes the stick */

      sw->fail = SW_FAIL;

      return -1;
}

static void sw_poll(struct gameport *gameport)
{
      struct sw *sw = gameport_get_drvdata(gameport);

      sw->reads++;
      if (sw_read(sw))
            sw->bads++;
}

static int sw_open(struct input_dev *dev)
{
      struct sw *sw = input_get_drvdata(dev);

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

static void sw_close(struct input_dev *dev)
{
      struct sw *sw = input_get_drvdata(dev);

      gameport_stop_polling(sw->gameport);
}

/*
 * sw_print_packet() prints the contents of a SideWinder packet.
 */

static void sw_print_packet(char *name, int length, unsigned char *buf, char bits)
{
      int i;

      printk(KERN_INFO "sidewinder.c: %s packet, %d bits. [", name, length);
      for (i = (((length + 3) >> 2) - 1); i >= 0; i--)
            printk("%x", (int)sw_get_bits(buf, i << 2, 4, bits));
      printk("]\n");
}

/*
 * sw_3dp_id() translates the 3DP id into a human legible string.
 * Unfortunately I don't know how to do this for the other SW types.
 */

static void sw_3dp_id(unsigned char *buf, char *comment, size_t size)
{
      int i;
      char pnp[8], rev[9];

      for (i = 0; i < 7; i++)                               /* ASCII PnP ID */
            pnp[i] = sw_get_bits(buf, 24+8*i, 8, 1);

      for (i = 0; i < 8; i++)                               /* ASCII firmware revision */
            rev[i] = sw_get_bits(buf, 88+8*i, 8, 1);

      pnp[7] = rev[8] = 0;

      snprintf(comment, size, " [PnP %d.%02d id %s rev %s]",
            (int) ((sw_get_bits(buf, 8, 6, 1) << 6) |       /* Two 6-bit values */
                  sw_get_bits(buf, 16, 6, 1)) / 100,
            (int) ((sw_get_bits(buf, 8, 6, 1) << 6) |
                  sw_get_bits(buf, 16, 6, 1)) % 100,
             pnp, rev);
}

/*
 * sw_guess_mode() checks the upper two button bits for toggling -
 * indication of that the joystick is in 3-bit mode. This is documented
 * behavior for 3DP ID packet, and for example the FSP does this in
 * normal packets instead. Fun ...
 */

static int sw_guess_mode(unsigned char *buf, int len)
{
      int i;
      unsigned char xor = 0;

      for (i = 1; i < len; i++)
            xor |= (buf[i - 1] ^ buf[i]) & 6;

      return !!xor * 2 + 1;
}

/*
 * sw_connect() probes for SideWinder type joysticks.
 */

static int sw_connect(struct gameport *gameport, struct gameport_driver *drv)
{
      struct sw *sw;
      struct input_dev *input_dev;
      int i, j, k, l;
      int err = 0;
      unsigned char *buf = NULL;    /* [SW_LENGTH] */
      unsigned char *idbuf = NULL;  /* [SW_LENGTH] */
      unsigned char m = 1;
      char comment[40];

      comment[0] = 0;

      sw = kzalloc(sizeof(struct sw), GFP_KERNEL);
      buf = kmalloc(SW_LENGTH, GFP_KERNEL);
      idbuf = kmalloc(SW_LENGTH, GFP_KERNEL);
      if (!sw || !buf || !idbuf) {
            err = -ENOMEM;
            goto fail1;
      }

      sw->gameport = gameport;

      gameport_set_drvdata(gameport, sw);

      err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);
      if (err)
            goto fail1;

      dbg("Init 0: Opened %s, io %#x, speed %d",
            gameport->phys, gameport->io, gameport->speed);

      i = sw_read_packet(gameport, buf, SW_LENGTH, 0);            /* Read normal packet */
      msleep(SW_TIMEOUT);
      dbg("Init 1: Mode %d. Length %d.", m , i);

      if (!i) {                                       /* No data. 3d Pro analog mode? */
            sw_init_digital(gameport);                      /* Switch to digital */
            msleep(SW_TIMEOUT);
            i = sw_read_packet(gameport, buf, SW_LENGTH, 0);      /* Retry reading packet */
            msleep(SW_TIMEOUT);
            dbg("Init 1b: Length %d.", i);
            if (!i) {                                 /* No data -> FAIL */
                  err = -ENODEV;
                  goto fail2;
            }
      }

      j = sw_read_packet(gameport, idbuf, SW_LENGTH, i);          /* Read ID. This initializes the stick */
      m |= sw_guess_mode(idbuf, j);                         /* ID packet should carry mode info [3DP] */
      dbg("Init 2: Mode %d. ID Length %d.", m, j);

      if (j <= 0) {                                         /* Read ID failed. Happens in 1-bit mode on PP */
            msleep(SW_TIMEOUT);
            i = sw_read_packet(gameport, buf, SW_LENGTH, 0);      /* Retry reading packet */
            m |= sw_guess_mode(buf, i);
            dbg("Init 2b: Mode %d. Length %d.", m, i);
            if (!i) {
                  err = -ENODEV;
                  goto fail2;
            }
            msleep(SW_TIMEOUT);
            j = sw_read_packet(gameport, idbuf, SW_LENGTH, i);    /* Retry reading ID */
            dbg("Init 2c: ID Length %d.", j);
      }

      sw->type = -1;
      k = SW_FAIL;                                          /* Try SW_FAIL times */
      l = 0;

      do {
            k--;
            msleep(SW_TIMEOUT);
            i = sw_read_packet(gameport, buf, SW_LENGTH, 0);      /* Read data packet */
            dbg("Init 3: Mode %d. Length %d. Last %d. Tries %d.", m, i, l, k);

            if (i > l) {                                    /* Longer? As we can only lose bits, it makes */
                                                      /* no sense to try detection for a packet shorter */
                  l = i;                                    /* than the previous one */

                  sw->number = 1;
                  sw->gameport = gameport;
                  sw->length = i;
                  sw->bits = m;

                  dbg("Init 3a: Case %d.\n", i * m);

                  switch (i * m) {
                        case 60:
                              sw->number++;
                        case 45:                      /* Ambiguous packet length */
                              if (j <= 40) {                /* ID length less or eq 40 -> FSP */
                        case 43:
                                    sw->type = SW_ID_FSP;
                                    break;
                              }
                              sw->number++;
                        case 30:
                              sw->number++;
                        case 15:
                              sw->type = SW_ID_GP;
                              break;
                        case 33:
                        case 31:
                              sw->type = SW_ID_FFW;
                              break;
                        case 48:                      /* Ambiguous */
                              if (j == 14) {                /* ID length 14*3 -> FFP */
                                    sw->type = SW_ID_FFP;
                                    sprintf(comment, " [AC %s]", sw_get_bits(idbuf,38,1,3) ? "off" : "on");
                              } else
                                    sw->type = SW_ID_PP;
                              break;
                        case 66:
                              sw->bits = 3;
                        case 198:
                              sw->length = 22;
                        case 64:
                              sw->type = SW_ID_3DP;
                              if (j == 160)
                                    sw_3dp_id(idbuf, comment, sizeof(comment));
                              break;
                  }
            }

      } while (k && sw->type == -1);

      if (sw->type == -1) {
            printk(KERN_WARNING "sidewinder.c: unknown joystick device detected "
                  "on %s, contact <vojtech@ucw.cz>\n", gameport->phys);
            sw_print_packet("ID", j * 3, idbuf, 3);
            sw_print_packet("Data", i * m, buf, m);
            err = -ENODEV;
            goto fail2;
      }

#ifdef SW_DEBUG
      sw_print_packet("ID", j * 3, idbuf, 3);
      sw_print_packet("Data", i * m, buf, m);
#endif

      gameport_set_poll_handler(gameport, sw_poll);
      gameport_set_poll_interval(gameport, 20);

      k = i;
      l = j;

      for (i = 0; i < sw->number; i++) {
            int bits, code;

            snprintf(sw->name, sizeof(sw->name),
                   "Microsoft SideWinder %s", sw_name[sw->type]);
            snprintf(sw->phys[i], sizeof(sw->phys[i]),
                   "%s/input%d", gameport->phys, i);

            sw->dev[i] = input_dev = input_allocate_device();
            if (!input_dev) {
                  err = -ENOMEM;
                  goto fail3;
            }

            input_dev->name = sw->name;
            input_dev->phys = sw->phys[i];
            input_dev->id.bustype = BUS_GAMEPORT;
            input_dev->id.vendor = GAMEPORT_ID_VENDOR_MICROSOFT;
            input_dev->id.product = sw->type;
            input_dev->id.version = 0x0100;
            input_dev->dev.parent = &gameport->dev;

            input_set_drvdata(input_dev, sw);

            input_dev->open = sw_open;
            input_dev->close = sw_close;

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

            for (j = 0; (bits = sw_bit[sw->type][j]); j++) {
                  code = sw_abs[sw->type][j];
                  set_bit(code, input_dev->absbit);
                  input_dev->absmax[code] = (1 << bits) - 1;
                  input_dev->absmin[code] = (bits == 1) ? -1 : 0;
                  input_dev->absfuzz[code] = ((bits >> 1) >= 2) ? (1 << ((bits >> 1) - 2)) : 0;
                  if (code != ABS_THROTTLE)
                        input_dev->absflat[code] = (bits >= 5) ? (1 << (bits - 5)) : 0;
            }

            for (j = 0; (code = sw_btn[sw->type][j]); j++)
                  set_bit(code, input_dev->keybit);

            dbg("%s%s [%d-bit id %d data %d]\n", sw->name, comment, m, l, k);

            err = input_register_device(sw->dev[i]);
            if (err)
                  goto fail4;
      }

 out: kfree(buf);
      kfree(idbuf);

      return err;

 fail4:     input_free_device(sw->dev[i]);
 fail3:     while (--i >= 0)
            input_unregister_device(sw->dev[i]);
 fail2:     gameport_close(gameport);
 fail1:     gameport_set_drvdata(gameport, NULL);
      kfree(sw);
      goto out;
}

static void sw_disconnect(struct gameport *gameport)
{
      struct sw *sw = gameport_get_drvdata(gameport);
      int i;

      for (i = 0; i < sw->number; i++)
            input_unregister_device(sw->dev[i]);
      gameport_close(gameport);
      gameport_set_drvdata(gameport, NULL);
      kfree(sw);
}

static struct gameport_driver sw_drv = {
      .driver           = {
            .name = "sidewinder",
            .owner      = THIS_MODULE,
      },
      .description      = DRIVER_DESC,
      .connect    = sw_connect,
      .disconnect = sw_disconnect,
};

static int __init sw_init(void)
{
      gameport_register_driver(&sw_drv);
      return 0;
}

static void __exit sw_exit(void)
{
      gameport_unregister_driver(&sw_drv);
}

module_init(sw_init);
module_exit(sw_exit);

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