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gamecon.c

/*
 * NES, SNES, N64, MultiSystem, PSX gamepad driver for Linux
 *
 *  Copyright (c) 1999-2004   Vojtech Pavlik <vojtech@suse.cz>
 *  Copyright (c) 2004        Peter Nelson <rufus-kernel@hackish.org>
 *
 *  Based on the work of:
 *    Andree Borrmann         John Dahlstrom
 *    David Kuder       Nathan Hand
 *    Raphael Assenat
 */

/*
 * 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/kernel.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/parport.h>
#include <linux/input.h>
#include <linux/mutex.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
MODULE_DESCRIPTION("NES, SNES, N64, MultiSystem, PSX gamepad driver");
MODULE_LICENSE("GPL");

#define GC_MAX_PORTS          3
#define GC_MAX_DEVICES        5

struct gc_config {
      int args[GC_MAX_DEVICES + 1];
      unsigned int nargs;
};

static struct gc_config gc_cfg[GC_MAX_PORTS] __initdata;

module_param_array_named(map, gc_cfg[0].args, int, &gc_cfg[0].nargs, 0);
MODULE_PARM_DESC(map, "Describes first set of devices (<parport#>,<pad1>,<pad2>,..<pad5>)");
module_param_array_named(map2, gc_cfg[1].args, int, &gc_cfg[1].nargs, 0);
MODULE_PARM_DESC(map2, "Describes second set of devices");
module_param_array_named(map3, gc_cfg[2].args, int, &gc_cfg[2].nargs, 0);
MODULE_PARM_DESC(map3, "Describes third set of devices");

/* see also gs_psx_delay parameter in PSX support section */

#define GC_SNES         1
#define GC_NES          2
#define GC_NES4         3
#define GC_MULTI  4
#define GC_MULTI2 5
#define GC_N64          6
#define GC_PSX          7
#define GC_DDR          8
#define GC_SNESMOUSE    9

#define GC_MAX          9

#define GC_REFRESH_TIME HZ/100

struct gc {
      struct pardevice *pd;
      struct input_dev *dev[GC_MAX_DEVICES];
      struct timer_list timer;
      unsigned char pads[GC_MAX + 1];
      int used;
      struct mutex mutex;
      char phys[GC_MAX_DEVICES][32];
};

static struct gc *gc_base[3];

static int gc_status_bit[] = { 0x40, 0x80, 0x20, 0x10, 0x08 };

static char *gc_names[] = { NULL, "SNES pad", "NES pad", "NES FourPort", "Multisystem joystick",
                        "Multisystem 2-button joystick", "N64 controller", "PSX controller",
                        "PSX DDR controller", "SNES mouse" };
/*
 * N64 support.
 */

static unsigned char gc_n64_bytes[] = { 0, 1, 13, 15, 14, 12, 10, 11, 2, 3 };
static short gc_n64_btn[] = { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_TL, BTN_TR, BTN_TRIGGER, BTN_START };

#define GC_N64_LENGTH         32          /* N64 bit length, not including stop bit */
#define GC_N64_REQUEST_LENGTH 37          /* transmit request sequence is 9 bits long */
#define GC_N64_DELAY          133         /* delay between transmit request, and response ready (us) */
#define GC_N64_REQUEST        0x1dd1111111ULL /* the request data command (encoded for 000000011) */
#define GC_N64_DWS            3           /* delay between write segments (required for sound playback because of ISA DMA) */
                                    /* GC_N64_DWS > 24 is known to fail */
#define GC_N64_POWER_W        0xe2        /* power during write (transmit request) */
#define GC_N64_POWER_R        0xfd        /* power during read */
#define GC_N64_OUT            0x1d        /* output bits to the 4 pads */
                                    /* Reading the main axes of any N64 pad is known to fail if the corresponding bit */
                                    /* in GC_N64_OUT is pulled low on the output port (by any routine) for more */
                                    /* than 123 us */
#define GC_N64_CLOCK          0x02        /* clock bits for read */

/*
 * gc_n64_read_packet() reads an N64 packet.
 * Each pad uses one bit per byte. So all pads connected to this port are read in parallel.
 */

static void gc_n64_read_packet(struct gc *gc, unsigned char *data)
{
      int i;
      unsigned long flags;

/*
 * Request the pad to transmit data
 */

      local_irq_save(flags);
      for (i = 0; i < GC_N64_REQUEST_LENGTH; i++) {
            parport_write_data(gc->pd->port, GC_N64_POWER_W | ((GC_N64_REQUEST >> i) & 1 ? GC_N64_OUT : 0));
            udelay(GC_N64_DWS);
      }
      local_irq_restore(flags);

/*
 * Wait for the pad response to be loaded into the 33-bit register of the adapter
 */

      udelay(GC_N64_DELAY);

/*
 * Grab data (ignoring the last bit, which is a stop bit)
 */

      for (i = 0; i < GC_N64_LENGTH; i++) {
            parport_write_data(gc->pd->port, GC_N64_POWER_R);
            data[i] = parport_read_status(gc->pd->port);
            parport_write_data(gc->pd->port, GC_N64_POWER_R | GC_N64_CLOCK);
       }

/*
 * We must wait 200 ms here for the controller to reinitialize before the next read request.
 * No worries as long as gc_read is polled less frequently than this.
 */

}

static void gc_n64_process_packet(struct gc *gc)
{
      unsigned char data[GC_N64_LENGTH];
      signed char axes[2];
      struct input_dev *dev;
      int i, j, s;

      gc_n64_read_packet(gc, data);

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

            dev = gc->dev[i];
            if (!dev)
                  continue;

            s = gc_status_bit[i];

            if (s & gc->pads[GC_N64] & ~(data[8] | data[9])) {

                  axes[0] = axes[1] = 0;

                  for (j = 0; j < 8; j++) {
                        if (data[23 - j] & s)
                              axes[0] |= 1 << j;
                        if (data[31 - j] & s)
                              axes[1] |= 1 << j;
                  }

                  input_report_abs(dev, ABS_X,  axes[0]);
                  input_report_abs(dev, ABS_Y, -axes[1]);

                  input_report_abs(dev, ABS_HAT0X, !(s & data[6]) - !(s & data[7]));
                  input_report_abs(dev, ABS_HAT0Y, !(s & data[4]) - !(s & data[5]));

                  for (j = 0; j < 10; j++)
                        input_report_key(dev, gc_n64_btn[j], s & data[gc_n64_bytes[j]]);

                  input_sync(dev);
            }
      }
}

/*
 * NES/SNES support.
 */

#define GC_NES_DELAY          6     /* Delay between bits - 6us */
#define GC_NES_LENGTH         8     /* The NES pads use 8 bits of data */
#define GC_SNES_LENGTH        12    /* The SNES true length is 16, but the
                                 last 4 bits are unused */
#define GC_SNESMOUSE_LENGTH   32    /* The SNES mouse uses 32 bits, the first
                                 16 bits are equivalent to a gamepad */

#define GC_NES_POWER    0xfc
#define GC_NES_CLOCK    0x01
#define GC_NES_LATCH    0x02

static unsigned char gc_nes_bytes[] = { 0, 1, 2, 3 };
static unsigned char gc_snes_bytes[] = { 8, 0, 2, 3, 9, 1, 10, 11 };
static short gc_snes_btn[] = { BTN_A, BTN_B, BTN_SELECT, BTN_START, BTN_X, BTN_Y, BTN_TL, BTN_TR };

/*
 * gc_nes_read_packet() reads a NES/SNES packet.
 * Each pad uses one bit per byte. So all pads connected to
 * this port are read in parallel.
 */

static void gc_nes_read_packet(struct gc *gc, int length, unsigned char *data)
{
      int i;

      parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK | GC_NES_LATCH);
      udelay(GC_NES_DELAY * 2);
      parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK);

      for (i = 0; i < length; i++) {
            udelay(GC_NES_DELAY);
            parport_write_data(gc->pd->port, GC_NES_POWER);
            data[i] = parport_read_status(gc->pd->port) ^ 0x7f;
            udelay(GC_NES_DELAY);
            parport_write_data(gc->pd->port, GC_NES_POWER | GC_NES_CLOCK);
      }
}

static void gc_nes_process_packet(struct gc *gc)
{
      unsigned char data[GC_SNESMOUSE_LENGTH];
      struct input_dev *dev;
      int i, j, s, len;
      char x_rel, y_rel;

      len = gc->pads[GC_SNESMOUSE] ? GC_SNESMOUSE_LENGTH :
                  (gc->pads[GC_SNES] ? GC_SNES_LENGTH : GC_NES_LENGTH);

      gc_nes_read_packet(gc, len, data);

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

            dev = gc->dev[i];
            if (!dev)
                  continue;

            s = gc_status_bit[i];

            if (s & (gc->pads[GC_NES] | gc->pads[GC_SNES])) {
                  input_report_abs(dev, ABS_X, !(s & data[6]) - !(s & data[7]));
                  input_report_abs(dev, ABS_Y, !(s & data[4]) - !(s & data[5]));
            }

            if (s & gc->pads[GC_NES])
                  for (j = 0; j < 4; j++)
                        input_report_key(dev, gc_snes_btn[j], s & data[gc_nes_bytes[j]]);

            if (s & gc->pads[GC_SNES])
                  for (j = 0; j < 8; j++)
                        input_report_key(dev, gc_snes_btn[j], s & data[gc_snes_bytes[j]]);

            if (s & gc->pads[GC_SNESMOUSE]) {
                  /*
                   * The 4 unused bits from SNES controllers appear to be ID bits
                   * so use them to make sure iwe are dealing with a mouse.
                   * gamepad is connected. This is important since
                   * my SNES gamepad sends 1's for bits 16-31, which
                   * cause the mouse pointer to quickly move to the
                   * upper left corner of the screen.
                   */
                  if (!(s & data[12]) && !(s & data[13]) &&
                      !(s & data[14]) && (s & data[15])) {
                        input_report_key(dev, BTN_LEFT, s & data[9]);
                        input_report_key(dev, BTN_RIGHT, s & data[8]);

                        x_rel = y_rel = 0;
                        for (j = 0; j < 7; j++) {
                              x_rel <<= 1;
                              if (data[25 + j] & s)
                                    x_rel |= 1;

                              y_rel <<= 1;
                              if (data[17 + j] & s)
                                    y_rel |= 1;
                        }

                        if (x_rel) {
                              if (data[24] & s)
                                    x_rel = -x_rel;
                              input_report_rel(dev, REL_X, x_rel);
                        }

                        if (y_rel) {
                              if (data[16] & s)
                                    y_rel = -y_rel;
                              input_report_rel(dev, REL_Y, y_rel);
                        }
                  }
            }
            input_sync(dev);
      }
}

/*
 * Multisystem joystick support
 */

#define GC_MULTI_LENGTH       5     /* Multi system joystick packet length is 5 */
#define GC_MULTI2_LENGTH      6     /* One more bit for one more button */

/*
 * gc_multi_read_packet() reads a Multisystem joystick packet.
 */

static void gc_multi_read_packet(struct gc *gc, int length, unsigned char *data)
{
      int i;

      for (i = 0; i < length; i++) {
            parport_write_data(gc->pd->port, ~(1 << i));
            data[i] = parport_read_status(gc->pd->port) ^ 0x7f;
      }
}

static void gc_multi_process_packet(struct gc *gc)
{
      unsigned char data[GC_MULTI2_LENGTH];
      struct input_dev *dev;
      int i, s;

      gc_multi_read_packet(gc, gc->pads[GC_MULTI2] ? GC_MULTI2_LENGTH : GC_MULTI_LENGTH, data);

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

            dev = gc->dev[i];
            if (!dev)
                  continue;

            s = gc_status_bit[i];

            if (s & (gc->pads[GC_MULTI] | gc->pads[GC_MULTI2])) {
                  input_report_abs(dev, ABS_X,  !(s & data[2]) - !(s & data[3]));
                  input_report_abs(dev, ABS_Y,  !(s & data[0]) - !(s & data[1]));
                  input_report_key(dev, BTN_TRIGGER, s & data[4]);
            }

            if (s & gc->pads[GC_MULTI2])
                  input_report_key(dev, BTN_THUMB, s & data[5]);

            input_sync(dev);
      }
}

/*
 * PSX support
 *
 * See documentation at:
 *    http://www.dim.com/~mackys/psxmemcard/ps-eng2.txt
 *    http://www.gamesx.com/controldata/psxcont/psxcont.htm
 *    ftp://milano.usal.es/pablo/
 *
 */

#define GC_PSX_DELAY    25          /* 25 usec */
#define GC_PSX_LENGTH   8           /* talk to the controller in bits */
#define GC_PSX_BYTES    6           /* the maximum number of bytes to read off the controller */

#define GC_PSX_MOUSE    1           /* Mouse */
#define GC_PSX_NEGCON   2           /* NegCon */
#define GC_PSX_NORMAL   4           /* Digital / Analog or Rumble in Digital mode  */
#define GC_PSX_ANALOG   5           /* Analog in Analog mode / Rumble in Green mode */
#define GC_PSX_RUMBLE   7           /* Rumble in Red mode */

#define GC_PSX_CLOCK    0x04        /* Pin 4 */
#define GC_PSX_COMMAND  0x01        /* Pin 2 */
#define GC_PSX_POWER    0xf8        /* Pins 5-9 */
#define GC_PSX_SELECT   0x02        /* Pin 3 */

#define GC_PSX_ID(x)    ((x) >> 4)  /* High nibble is device type */
#define GC_PSX_LEN(x)   (((x) & 0xf) << 1)      /* Low nibble is length in bytes/2 */

static int gc_psx_delay = GC_PSX_DELAY;
module_param_named(psx_delay, gc_psx_delay, uint, 0);
MODULE_PARM_DESC(psx_delay, "Delay when accessing Sony PSX controller (usecs)");

static short gc_psx_abs[] = { ABS_X, ABS_Y, ABS_RX, ABS_RY, ABS_HAT0X, ABS_HAT0Y };
static short gc_psx_btn[] = { BTN_TL, BTN_TR, BTN_TL2, BTN_TR2, BTN_A, BTN_B, BTN_X, BTN_Y,
                        BTN_START, BTN_SELECT, BTN_THUMBL, BTN_THUMBR };
static short gc_psx_ddr_btn[] = { BTN_0, BTN_1, BTN_2, BTN_3 };

/*
 * gc_psx_command() writes 8bit command and reads 8bit data from
 * the psx pad.
 */

static void gc_psx_command(struct gc *gc, int b, unsigned char data[GC_MAX_DEVICES])
{
      int i, j, cmd, read;

      for (i = 0; i < GC_MAX_DEVICES; i++)
            data[i] = 0;

      for (i = 0; i < GC_PSX_LENGTH; i++, b >>= 1) {
            cmd = (b & 1) ? GC_PSX_COMMAND : 0;
            parport_write_data(gc->pd->port, cmd | GC_PSX_POWER);
            udelay(gc_psx_delay);
            read = parport_read_status(gc->pd->port) ^ 0x80;
            for (j = 0; j < GC_MAX_DEVICES; j++)
                  data[j] |= (read & gc_status_bit[j] & (gc->pads[GC_PSX] | gc->pads[GC_DDR])) ? (1 << i) : 0;
            parport_write_data(gc->pd->port, cmd | GC_PSX_CLOCK | GC_PSX_POWER);
            udelay(gc_psx_delay);
      }
}

/*
 * gc_psx_read_packet() reads a whole psx packet and returns
 * device identifier code.
 */

static void gc_psx_read_packet(struct gc *gc, unsigned char data[GC_MAX_DEVICES][GC_PSX_BYTES],
                         unsigned char id[GC_MAX_DEVICES])
{
      int i, j, max_len = 0;
      unsigned long flags;
      unsigned char data2[GC_MAX_DEVICES];

      parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER);      /* Select pad */
      udelay(gc_psx_delay);
      parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_POWER);                /* Deselect, begin command */
      udelay(gc_psx_delay);

      local_irq_save(flags);

      gc_psx_command(gc, 0x01, data2);                                  /* Access pad */
      gc_psx_command(gc, 0x42, id);                                     /* Get device ids */
      gc_psx_command(gc, 0, data2);                                     /* Dump status */

      for (i =0; i < GC_MAX_DEVICES; i++)                                           /* Find the longest pad */
            if((gc_status_bit[i] & (gc->pads[GC_PSX] | gc->pads[GC_DDR]))
                  && (GC_PSX_LEN(id[i]) > max_len)
                  && (GC_PSX_LEN(id[i]) <= GC_PSX_BYTES))
                  max_len = GC_PSX_LEN(id[i]);

      for (i = 0; i < max_len; i++) {                                   /* Read in all the data */
            gc_psx_command(gc, 0, data2);
            for (j = 0; j < GC_MAX_DEVICES; j++)
                  data[j][i] = data2[j];
      }

      local_irq_restore(flags);

      parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER);

      for(i = 0; i < GC_MAX_DEVICES; i++)                                           /* Set id's to the real value */
            id[i] = GC_PSX_ID(id[i]);
}

static void gc_psx_process_packet(struct gc *gc)
{
      unsigned char data[GC_MAX_DEVICES][GC_PSX_BYTES];
      unsigned char id[GC_MAX_DEVICES];
      struct input_dev *dev;
      int i, j;

      gc_psx_read_packet(gc, data, id);

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

            dev = gc->dev[i];
            if (!dev)
                  continue;

            switch (id[i]) {

                  case GC_PSX_RUMBLE:

                        input_report_key(dev, BTN_THUMBL, ~data[i][0] & 0x04);
                        input_report_key(dev, BTN_THUMBR, ~data[i][0] & 0x02);

                  case GC_PSX_NEGCON:
                  case GC_PSX_ANALOG:

                        if (gc->pads[GC_DDR] & gc_status_bit[i]) {
                              for(j = 0; j < 4; j++)
                                    input_report_key(dev, gc_psx_ddr_btn[j], ~data[i][0] & (0x10 << j));
                        } else {
                              for (j = 0; j < 4; j++)
                                    input_report_abs(dev, gc_psx_abs[j + 2], data[i][j + 2]);

                              input_report_abs(dev, ABS_X, 128 + !(data[i][0] & 0x20) * 127 - !(data[i][0] & 0x80) * 128);
                              input_report_abs(dev, ABS_Y, 128 + !(data[i][0] & 0x40) * 127 - !(data[i][0] & 0x10) * 128);
                        }

                        for (j = 0; j < 8; j++)
                              input_report_key(dev, gc_psx_btn[j], ~data[i][1] & (1 << j));

                        input_report_key(dev, BTN_START,  ~data[i][0] & 0x08);
                        input_report_key(dev, BTN_SELECT, ~data[i][0] & 0x01);

                        input_sync(dev);

                        break;

                  case GC_PSX_NORMAL:
                        if (gc->pads[GC_DDR] & gc_status_bit[i]) {
                              for(j = 0; j < 4; j++)
                                    input_report_key(dev, gc_psx_ddr_btn[j], ~data[i][0] & (0x10 << j));
                        } else {
                              input_report_abs(dev, ABS_X, 128 + !(data[i][0] & 0x20) * 127 - !(data[i][0] & 0x80) * 128);
                              input_report_abs(dev, ABS_Y, 128 + !(data[i][0] & 0x40) * 127 - !(data[i][0] & 0x10) * 128);

                              /* for some reason if the extra axes are left unset they drift */
                              /* for (j = 0; j < 4; j++)
                                    input_report_abs(dev, gc_psx_abs[j + 2], 128);
                               * This needs to be debugged properly,
                               * maybe fuzz processing needs to be done in input_sync()
                               *                       --vojtech
                               */
                        }

                        for (j = 0; j < 8; j++)
                              input_report_key(dev, gc_psx_btn[j], ~data[i][1] & (1 << j));

                        input_report_key(dev, BTN_START,  ~data[i][0] & 0x08);
                        input_report_key(dev, BTN_SELECT, ~data[i][0] & 0x01);

                        input_sync(dev);

                        break;

                  case 0: /* not a pad, ignore */
                        break;
            }
      }
}

/*
 * gc_timer() initiates reads of console pads data.
 */

static void gc_timer(unsigned long private)
{
      struct gc *gc = (void *) private;

/*
 * N64 pads - must be read first, any read confuses them for 200 us
 */

      if (gc->pads[GC_N64])
            gc_n64_process_packet(gc);

/*
 * NES and SNES pads or mouse
 */

      if (gc->pads[GC_NES] || gc->pads[GC_SNES] || gc->pads[GC_SNESMOUSE])
            gc_nes_process_packet(gc);

/*
 * Multi and Multi2 joysticks
 */

      if (gc->pads[GC_MULTI] || gc->pads[GC_MULTI2])
            gc_multi_process_packet(gc);

/*
 * PSX controllers
 */

      if (gc->pads[GC_PSX] || gc->pads[GC_DDR])
            gc_psx_process_packet(gc);

      mod_timer(&gc->timer, jiffies + GC_REFRESH_TIME);
}

static int gc_open(struct input_dev *dev)
{
      struct gc *gc = input_get_drvdata(dev);
      int err;

      err = mutex_lock_interruptible(&gc->mutex);
      if (err)
            return err;

      if (!gc->used++) {
            parport_claim(gc->pd);
            parport_write_control(gc->pd->port, 0x04);
            mod_timer(&gc->timer, jiffies + GC_REFRESH_TIME);
      }

      mutex_unlock(&gc->mutex);
      return 0;
}

static void gc_close(struct input_dev *dev)
{
      struct gc *gc = input_get_drvdata(dev);

      mutex_lock(&gc->mutex);
      if (!--gc->used) {
            del_timer_sync(&gc->timer);
            parport_write_control(gc->pd->port, 0x00);
            parport_release(gc->pd);
      }
      mutex_unlock(&gc->mutex);
}

static int __init gc_setup_pad(struct gc *gc, int idx, int pad_type)
{
      struct input_dev *input_dev;
      int i;

      if (!pad_type)
            return 0;

      if (pad_type < 1 || pad_type > GC_MAX) {
            printk(KERN_WARNING "gamecon.c: Pad type %d unknown\n", pad_type);
            return -EINVAL;
      }

      gc->dev[idx] = input_dev = input_allocate_device();
      if (!input_dev) {
            printk(KERN_ERR "gamecon.c: Not enough memory for input device\n");
            return -ENOMEM;
      }

      input_dev->name = gc_names[pad_type];
      input_dev->phys = gc->phys[idx];
      input_dev->id.bustype = BUS_PARPORT;
      input_dev->id.vendor = 0x0001;
      input_dev->id.product = pad_type;
      input_dev->id.version = 0x0100;

      input_set_drvdata(input_dev, gc);

      input_dev->open = gc_open;
      input_dev->close = gc_close;

      if (pad_type != GC_SNESMOUSE) {
            input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

            for (i = 0; i < 2; i++)
                  input_set_abs_params(input_dev, ABS_X + i, -1, 1, 0, 0);
      } else
            input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);

      gc->pads[0] |= gc_status_bit[idx];
      gc->pads[pad_type] |= gc_status_bit[idx];

      switch (pad_type) {

            case GC_N64:
                  for (i = 0; i < 10; i++)
                        set_bit(gc_n64_btn[i], input_dev->keybit);

                  for (i = 0; i < 2; i++) {
                        input_set_abs_params(input_dev, ABS_X + i, -127, 126, 0, 2);
                        input_set_abs_params(input_dev, ABS_HAT0X + i, -1, 1, 0, 0);
                  }

                  break;

            case GC_SNESMOUSE:
                  set_bit(BTN_LEFT, input_dev->keybit);
                  set_bit(BTN_RIGHT, input_dev->keybit);
                  set_bit(REL_X, input_dev->relbit);
                  set_bit(REL_Y, input_dev->relbit);
                  break;

            case GC_SNES:
                  for (i = 4; i < 8; i++)
                        set_bit(gc_snes_btn[i], input_dev->keybit);
            case GC_NES:
                  for (i = 0; i < 4; i++)
                        set_bit(gc_snes_btn[i], input_dev->keybit);
                  break;

            case GC_MULTI2:
                  set_bit(BTN_THUMB, input_dev->keybit);
            case GC_MULTI:
                  set_bit(BTN_TRIGGER, input_dev->keybit);
                  break;

            case GC_PSX:
                  for (i = 0; i < 6; i++)
                        input_set_abs_params(input_dev, gc_psx_abs[i], 4, 252, 0, 2);
                  for (i = 0; i < 12; i++)
                        set_bit(gc_psx_btn[i], input_dev->keybit);

                  break;

            case GC_DDR:
                  for (i = 0; i < 4; i++)
                        set_bit(gc_psx_ddr_btn[i], input_dev->keybit);
                  for (i = 0; i < 12; i++)
                        set_bit(gc_psx_btn[i], input_dev->keybit);

                  break;
      }

      return 0;
}

static struct gc __init *gc_probe(int parport, int *pads, int n_pads)
{
      struct gc *gc;
      struct parport *pp;
      struct pardevice *pd;
      int i;
      int err;

      pp = parport_find_number(parport);
      if (!pp) {
            printk(KERN_ERR "gamecon.c: no such parport\n");
            err = -EINVAL;
            goto err_out;
      }

      pd = parport_register_device(pp, "gamecon", NULL, NULL, NULL, PARPORT_DEV_EXCL, NULL);
      if (!pd) {
            printk(KERN_ERR "gamecon.c: parport busy already - lp.o loaded?\n");
            err = -EBUSY;
            goto err_put_pp;
      }

      gc = kzalloc(sizeof(struct gc), GFP_KERNEL);
      if (!gc) {
            printk(KERN_ERR "gamecon.c: Not enough memory\n");
            err = -ENOMEM;
            goto err_unreg_pardev;
      }

      mutex_init(&gc->mutex);
      gc->pd = pd;
      init_timer(&gc->timer);
      gc->timer.data = (long) gc;
      gc->timer.function = gc_timer;

      for (i = 0; i < n_pads && i < GC_MAX_DEVICES; i++) {
            if (!pads[i])
                  continue;

            snprintf(gc->phys[i], sizeof(gc->phys[i]),
                   "%s/input%d", gc->pd->port->name, i);
            err = gc_setup_pad(gc, i, pads[i]);
            if (err)
                  goto err_unreg_devs;

            err = input_register_device(gc->dev[i]);
            if (err)
                  goto err_free_dev;
      }

      if (!gc->pads[0]) {
            printk(KERN_ERR "gamecon.c: No valid devices specified\n");
            err = -EINVAL;
            goto err_free_gc;
      }

      parport_put_port(pp);
      return gc;

 err_free_dev:
      input_free_device(gc->dev[i]);
 err_unreg_devs:
      while (--i >= 0)
            if (gc->dev[i])
                  input_unregister_device(gc->dev[i]);
 err_free_gc:
      kfree(gc);
 err_unreg_pardev:
      parport_unregister_device(pd);
 err_put_pp:
      parport_put_port(pp);
 err_out:
      return ERR_PTR(err);
}

static void gc_remove(struct gc *gc)
{
      int i;

      for (i = 0; i < GC_MAX_DEVICES; i++)
            if (gc->dev[i])
                  input_unregister_device(gc->dev[i]);
      parport_unregister_device(gc->pd);
      kfree(gc);
}

static int __init gc_init(void)
{
      int i;
      int have_dev = 0;
      int err = 0;

      for (i = 0; i < GC_MAX_PORTS; i++) {
            if (gc_cfg[i].nargs == 0 || gc_cfg[i].args[0] < 0)
                  continue;

            if (gc_cfg[i].nargs < 2) {
                  printk(KERN_ERR "gamecon.c: at least one device must be specified\n");
                  err = -EINVAL;
                  break;
            }

            gc_base[i] = gc_probe(gc_cfg[i].args[0],
                              gc_cfg[i].args + 1, gc_cfg[i].nargs - 1);
            if (IS_ERR(gc_base[i])) {
                  err = PTR_ERR(gc_base[i]);
                  break;
            }

            have_dev = 1;
      }

      if (err) {
            while (--i >= 0)
                  if (gc_base[i])
                        gc_remove(gc_base[i]);
            return err;
      }

      return have_dev ? 0 : -ENODEV;
}

static void __exit gc_exit(void)
{
      int i;

      for (i = 0; i < GC_MAX_PORTS; i++)
            if (gc_base[i])
                  gc_remove(gc_base[i]);
}

module_init(gc_init);
module_exit(gc_exit);

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