/*
 * 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);