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/*

 * $Id: gamecon.c,v 1.1.1.1 2004-04-15 02:03:31 phoenix Exp $

 *

 *  Copyright (c) 1999-2001 Vojtech Pavlik

 *

 *  Based on the work of:

 *      Andree Borrmann         John Dahlstrom

 *      David Kuder             Nathan Hand

 *

 *  Sponsored by SuSE

 */

/*

 * NES, SNES, N64, Multi1, Multi2, PSX 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@suse.cz>, or by paper mail:

 * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic

 */

#include <linux/kernel.h>

#include <linux/delay.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/parport.h>

#include <linux/input.h>

MODULE_AUTHOR("Vojtech Pavlik <vojtech@suse.cz>");

MODULE_LICENSE("GPL");

MODULE_PARM(gc, "2-6i");

MODULE_PARM(gc_2,"2-6i");

MODULE_PARM(gc_3,"2-6i");

#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_MAX          7

#define GC_REFRESH_TIME HZ/100

struct gc {

        struct pardevice *pd;

        struct input_dev dev[5];

        struct timer_list timer;

        unsigned char pads[GC_MAX + 1];

        int used;

};

static struct gc *gc_base[3];

static int gc[] __initdata = { -1, 0, 0, 0, 0, 0 };

static int gc_2[] __initdata = { -1, 0, 0, 0, 0, 0 };

static int gc_3[] __initdata = { -1, 0, 0, 0, 0, 0 };

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" };

/*

 * 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

 */

        __save_flags(flags);

        __cli();

        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);

        }

        __restore_flags(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.

 */

}

/*

 * 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_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);

        }

}

/*

 * 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;

        }

}

/*

 * 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    60              /* 60 usec */

#define GC_PSX_LENGTH   8               /* talk to the controller in bytes */

#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 1 */

#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)     /* Low nibble is length in words */

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 };

/*

 * gc_psx_command() writes 8bit command and reads 8bit data from

 * the psx pad.

 */

static int gc_psx_command(struct gc *gc, int b)

{

        int i, cmd, data = 0;

        for (i = 0; i < 8; i++, b >>= 1) {

                cmd = (b & 1) ? GC_PSX_COMMAND : 0;

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

                udelay(GC_PSX_DELAY);

                data |= ((parport_read_status(gc->pd->port) ^ 0x80) & gc->pads[GC_PSX]) ? (1 << i) : 0;

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

                udelay(GC_PSX_DELAY);

        }

        return data;

}

/*

 * gc_psx_read_packet() reads a whole psx packet and returns

 * device identifier code.

 */

static int gc_psx_read_packet(struct gc *gc, unsigned char *data)

{

        int i, id;

        unsigned long flags;

        parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_SELECT | GC_PSX_POWER);  /* Select pad */

        udelay(GC_PSX_DELAY * 2);

        parport_write_data(gc->pd->port, GC_PSX_CLOCK | GC_PSX_POWER);                  /* Deselect, begin command */

        udelay(GC_PSX_DELAY * 2);

        __save_flags(flags);

        __cli();

        gc_psx_command(gc, 0x01);                                                       /* Access pad */

        id = gc_psx_command(gc, 0x42);                                                  /* Get device id */

        if (gc_psx_command(gc, 0) == 0x5a) {                                             /* Okay? */

                for (i = 0; i < GC_PSX_LEN(id) * 2; i++)

                        data[i] = gc_psx_command(gc, 0);

        } else id = 0;

        __restore_flags(flags);

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

        return GC_PSX_ID(id);

}

/*

 * gc_timer() reads and analyzes console pads data.

 */

#define GC_MAX_LENGTH GC_N64_LENGTH

static void gc_timer(unsigned long private)

{

        struct gc *gc = (void *) private;

        struct input_dev *dev = gc->dev;

        unsigned char data[GC_MAX_LENGTH];

        int i, j, s;

/*

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

 */

        if (gc->pads[GC_N64]) {

                gc_n64_read_packet(gc, data);

                for (i = 0; i < 5; i++) {

                        s = gc_status_bit[i];

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

                                signed char axes[2];

                                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 + i, ABS_X,  axes[0]);

                                input_report_abs(dev + i, ABS_Y, -axes[1]);

                                input_report_abs(dev + i, ABS_HAT0X, !(s & data[6]) - !(s & data[7]));

                                input_report_abs(dev + i, ABS_HAT0Y, !(s & data[4]) - !(s & data[5]));

                                for (j = 0; j < 10; j++)

                                        input_report_key(dev + i, gc_n64_btn[j], s & data[gc_n64_bytes[j]]);

                        }

                }

        }

/*

 * NES and SNES pads

 */

        if (gc->pads[GC_NES] || gc->pads[GC_SNES]) {

                gc_nes_read_packet(gc, gc->pads[GC_SNES] ? GC_SNES_LENGTH : GC_NES_LENGTH, data);

                for (i = 0; i < 5; i++) {

                        s = gc_status_bit[i];

                        if (s & (gc->pads[GC_NES] | gc->pads[GC_SNES])) {

                                input_report_abs(dev + i, ABS_X, !(s & data[6]) - !(s & data[7]));

                                input_report_abs(dev + i, ABS_Y, !(s & data[4]) - !(s & data[5]));

                        }

                        if (s & gc->pads[GC_NES])

                                for (j = 0; j < 4; j++)

                                        input_report_key(dev + i, 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 + i, gc_snes_btn[j], s & data[gc_snes_bytes[j]]);

                }

        }

/*

 * Multi and Multi2 joysticks

 */

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

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

                for (i = 0; i < 5; i++) {

                        s = gc_status_bit[i];

                        if (s & (gc->pads[GC_MULTI] | gc->pads[GC_MULTI2])) {

                                input_report_abs(dev + i, ABS_X,  !(s & data[2]) - !(s & data[3]));

                                input_report_abs(dev + i, ABS_Y,  !(s & data[0]) - !(s & data[1]));

                                input_report_key(dev + i, BTN_TRIGGER, s & data[4]);

                        }

                        if (s & gc->pads[GC_MULTI2])

                                input_report_key(dev + i, BTN_THUMB, s & data[5]);

                }

        }

/*

 * PSX controllers

 */

        if (gc->pads[GC_PSX]) {

                for (i = 0; i < 5; i++)

                        if (gc->pads[GC_PSX] & gc_status_bit[i])

                                break;

                switch (gc_psx_read_packet(gc, data)) {

                        case GC_PSX_RUMBLE:

                                input_report_key(dev + i, BTN_THUMB,  ~data[0] & 0x04);

                                input_report_key(dev + i, BTN_THUMB2, ~data[0] & 0x02);

                        case GC_PSX_NEGCON:

                        case GC_PSX_ANALOG:

                                for (j = 0; j < 4; j++)

                                        input_report_abs(dev + i, gc_psx_abs[j], data[j + 2]);

                                input_report_abs(dev + i, ABS_HAT0X, !(data[0] & 0x20) - !(data[0] & 0x80));

                                input_report_abs(dev + i, ABS_HAT0Y, !(data[0] & 0x40) - !(data[0] & 0x10));

                                for (j = 0; j < 8; j++)

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

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

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

                                break;

                        case GC_PSX_NORMAL:

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

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

                                for (j = 0; j < 8; j++)

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

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

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

                                break;

                }

        }

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

}

static int gc_open(struct input_dev *dev)

{

        struct gc *gc = dev->private;

        if (!gc->used++) {

                parport_claim(gc->pd);

                parport_write_control(gc->pd->port, 0x04);

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

        }

        return 0;

}

static void gc_close(struct input_dev *dev)

{

        struct gc *gc = dev->private;

        if (!--gc->used) {

                del_timer(&gc->timer);

                parport_write_control(gc->pd->port, 0x00);

                parport_release(gc->pd);

        }

}

static struct gc __init *gc_probe(int *config)

{

        struct gc *gc;

        struct parport *pp;

        int i, j, psx;

        unsigned char data[32];

        if (config[0] < 0)

                return NULL;

        for (pp = parport_enumerate(); pp && (config[0] > 0); pp = pp->next)

                config[0]--;

        if (!pp) {

                printk(KERN_ERR "gamecon.c: no such parport\n");

                return NULL;

        }

        if (!(gc = kmalloc(sizeof(struct gc), GFP_KERNEL)))

                return NULL;

        memset(gc, 0, sizeof(struct gc));

        gc->pd = parport_register_device(pp, "gamecon", NULL, NULL, NULL, PARPORT_DEV_EXCL, NULL);

        if (!gc->pd) {

                printk(KERN_ERR "gamecon.c: parport busy already - lp.o loaded?\n");

                kfree(gc);

                return NULL;

        }

        parport_claim(gc->pd);

        init_timer(&gc->timer);

        gc->timer.data = (long) gc;

        gc->timer.function = gc_timer;

        for (i = 0; i < 5; i++) {

                if (!config[i + 1])

                        continue;

                if (config[i + 1] < 1 || config[i + 1] > GC_MAX) {

                        printk(KERN_WARNING "gamecon.c: Pad type %d unknown\n", config[i + 1]);

                        continue;

                }

                gc->dev[i].private = gc;

                gc->dev[i].open = gc_open;

                gc->dev[i].close = gc_close;

                gc->dev[i].evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);

                for (j = 0; j < 2; j++) {

                        set_bit(ABS_X + j, gc->dev[i].absbit);

                        gc->dev[i].absmin[ABS_X + j] = -1;

                        gc->dev[i].absmax[ABS_X + j] =  1;

                }

                gc->pads[0] |= gc_status_bit[i];

                gc->pads[config[i + 1]] |= gc_status_bit[i];

                switch(config[i + 1]) {

                        case GC_N64:

                                for (j = 0; j < 10; j++)

                                        set_bit(gc_n64_btn[j], gc->dev[i].keybit);

                                for (j = 0; j < 2; j++) {

                                        set_bit(ABS_X + j, gc->dev[i].absbit);

                                        gc->dev[i].absmin[ABS_X + j] = -127;

                                        gc->dev[i].absmax[ABS_X + j] =  126;

                                        gc->dev[i].absflat[ABS_X + j] = 2;

                                        set_bit(ABS_HAT0X + j, gc->dev[i].absbit);

                                        gc->dev[i].absmin[ABS_HAT0X + j] = -1;

                                        gc->dev[i].absmax[ABS_HAT0X + j] =  1;

                                }

                                break;

                        case GC_SNES:

                                for (j = 4; j < 8; j++)

                                        set_bit(gc_snes_btn[j], gc->dev[i].keybit);

                        case GC_NES:

                                for (j = 0; j < 4; j++)

                                        set_bit(gc_snes_btn[j], gc->dev[i].keybit);

                                break;

                        case GC_MULTI2:

                                set_bit(BTN_THUMB, gc->dev[i].keybit);

                        case GC_MULTI:

                                set_bit(BTN_TRIGGER, gc->dev[i].keybit);

                                break;

                        case GC_PSX:

                                psx = gc_psx_read_packet(gc, data);

                                switch(psx) {

                                        case GC_PSX_NEGCON:

                                        case GC_PSX_NORMAL:

                                        case GC_PSX_ANALOG:

                                        case GC_PSX_RUMBLE:

                                                for (j = 0; j < 6; j++) {

                                                        psx = gc_psx_abs[j];

                                                        set_bit(psx, gc->dev[i].absbit);

                                                        if (j < 4) {

                                                                gc->dev[i].absmin[psx] = 4;

                                                                gc->dev[i].absmax[psx] = 252;

                                                                gc->dev[i].absflat[psx] = 2;

                                                        } else {

                                                                gc->dev[i].absmin[psx] = -1;

                                                                gc->dev[i].absmax[psx] = 1;

                                                        }

                                                }

                                                for (j = 0; j < 12; j++)

                                                        set_bit(gc_psx_btn[j], gc->dev[i].keybit);

                                                break;

                                        case 0:

                                                gc->pads[GC_PSX] &= ~gc_status_bit[i];

                                                printk(KERN_ERR "gamecon.c: No PSX controller found.\n");

                                                break;

                                        default:

                                                gc->pads[GC_PSX] &= ~gc_status_bit[i];

                                                printk(KERN_WARNING "gamecon.c: Unsupported PSX controller %#x,"

                                                        " please report to <vojtech@suse.cz>.\n", psx);

                                }

                                break;

                }

                gc->dev[i].name = gc_names[config[i + 1]];

                gc->dev[i].idbus = BUS_PARPORT;

                gc->dev[i].idvendor = 0x0001;

                gc->dev[i].idproduct = config[i + 1];

                gc->dev[i].idversion = 0x0100;

        }

        parport_release(gc->pd);

        if (!gc->pads[0]) {

                parport_unregister_device(gc->pd);

                kfree(gc);