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/*

 * $Id: tmdc.c,v 1.31 2002/01/22 20:29:52 vojtech Exp $

 *

 *  Copyright (c) 1998-2001 Vojtech Pavlik

 *

 *   Based on the work of:

 *      Trystan Larey-Williams

 */

/*

 * ThrustMaster DirectConnect (BSP) 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/slab.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/gameport.h>

#include <linux/input.h>

#include <linux/jiffies.h>

#define DRIVER_DESC     "ThrustMaster DirectConnect joystick driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

#define TMDC_MAX_START          600     /* 600 us */

#define TMDC_MAX_STROBE         60      /* 60 us */

#define TMDC_MAX_LENGTH         13

#define TMDC_MODE_M3DI          1

#define TMDC_MODE_3DRP          3

#define TMDC_MODE_AT            4

#define TMDC_MODE_FM            8

#define TMDC_MODE_FGP           163

#define TMDC_BYTE_ID            10

#define TMDC_BYTE_REV           11

#define TMDC_BYTE_DEF           12

#define TMDC_ABS                7

#define TMDC_ABS_HAT            4

#define TMDC_BTN                16

static const unsigned char tmdc_byte_a[16] = { 0, 1, 3, 4, 6, 7 };

static const unsigned char tmdc_byte_d[16] = { 2, 5, 8, 9 };

static const signed char tmdc_abs[TMDC_ABS] =

        { ABS_X, ABS_Y, ABS_RUDDER, ABS_THROTTLE, ABS_RX, ABS_RY, ABS_RZ };

static const signed char tmdc_abs_hat[TMDC_ABS_HAT] =

        { ABS_HAT0X, ABS_HAT0Y, ABS_HAT1X, ABS_HAT1Y };

static const signed char tmdc_abs_at[TMDC_ABS] =

        { ABS_X, ABS_Y, ABS_RUDDER, -1, ABS_THROTTLE };

static const signed char tmdc_abs_fm[TMDC_ABS] =

        { ABS_RX, ABS_RY, ABS_X, ABS_Y };

static const short tmdc_btn_pad[TMDC_BTN] =

        { BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z, BTN_START, BTN_SELECT, BTN_TL, BTN_TR };

static const short tmdc_btn_joy[TMDC_BTN] =

        { BTN_TRIGGER, BTN_THUMB, BTN_TOP, BTN_TOP2, BTN_BASE, BTN_BASE2, BTN_THUMB2, BTN_PINKIE,

          BTN_BASE3, BTN_BASE4, BTN_A, BTN_B, BTN_C, BTN_X, BTN_Y, BTN_Z };

static const short tmdc_btn_fm[TMDC_BTN] =

        { BTN_TRIGGER, BTN_C, BTN_B, BTN_A, BTN_THUMB, BTN_X, BTN_Y, BTN_Z, BTN_TOP, BTN_TOP2 };

static const short tmdc_btn_at[TMDC_BTN] =

        { BTN_TRIGGER, BTN_THUMB2, BTN_PINKIE, BTN_THUMB, BTN_BASE6, BTN_BASE5, BTN_BASE4,

          BTN_BASE3, BTN_BASE2, BTN_BASE };

static const struct {

        int x;

        int y;

} tmdc_hat_to_axis[] = {{ 0, 0}, { 1, 0}, { 0,-1}, {-1, 0}, { 0, 1}};

static const struct tmdc_model {

        unsigned char id;

        const char *name;

        char abs;

        char hats;

        char btnc[4];

        char btno[4];

        const signed char *axes;

        const short *buttons;

} tmdc_models[] = {

        {   1, "ThrustMaster Millenium 3D Inceptor",      6, 2, { 4, 2 }, { 4, 6 }, tmdc_abs, tmdc_btn_joy },

        {   3, "ThrustMaster Rage 3D Gamepad",            2, 0, { 8, 2 }, { 0, 0 }, tmdc_abs, tmdc_btn_pad },

        {   4, "ThrustMaster Attack Throttle",            5, 2, { 4, 6 }, { 4, 2 }, tmdc_abs_at, tmdc_btn_at },

        {   8, "ThrustMaster FragMaster",                 4, 0, { 8, 2 }, { 0, 0 }, tmdc_abs_fm, tmdc_btn_fm },

        { 163, "Thrustmaster Fusion GamePad",             2, 0, { 8, 2 }, { 0, 0 }, tmdc_abs, tmdc_btn_pad },

        {   0, "Unknown %d-axis, %d-button TM device %d", 0, 0, { 0, 0 }, { 0, 0 }, tmdc_abs, tmdc_btn_joy }

};

struct tmdc_port {

        struct input_dev *dev;

        char name[64];

        char phys[32];

        int mode;

        const signed char *abs;

        const short *btn;

        unsigned char absc;

        unsigned char btnc[4];

        unsigned char btno[4];

};

struct tmdc {

        struct gameport *gameport;

        struct tmdc_port *port[2];

#if 0

        struct input_dev *dev[2];

        char name[2][64];

        char phys[2][32];

        int mode[2];

        signed char *abs[2];

        short *btn[2];

        unsigned char absc[2];

        unsigned char btnc[2][4];

        unsigned char btno[2][4];

#endif

        int reads;

        int bads;

        unsigned char exists;

};

/*

 * tmdc_read_packet() reads a ThrustMaster packet.

 */

static int tmdc_read_packet(struct gameport *gameport, unsigned char data[2][TMDC_MAX_LENGTH])

{

        unsigned char u, v, w, x;

        unsigned long flags;

        int i[2], j[2], t[2], p, k;

        p = gameport_time(gameport, TMDC_MAX_STROBE);

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

                t[k] = gameport_time(gameport, TMDC_MAX_START);

                i[k] = j[k] = 0;

        }

        local_irq_save(flags);

        gameport_trigger(gameport);

        w = gameport_read(gameport) >> 4;

        do {

                x = w;

                w = gameport_read(gameport) >> 4;

                for (k = 0, v = w, u = x; k < 2; k++, v >>= 2, u >>= 2) {

                        if (~v & u & 2) {

                                if (t[k] <= 0 || i[k] >= TMDC_MAX_LENGTH) continue;

                                t[k] = p;

                                if (j[k] == 0) {                          /* Start bit */

                                        if (~v & 1) t[k] = 0;

                                        data[k][i[k]] = 0; j[k]++; continue;

                                }

                                if (j[k] == 9) {                                /* Stop bit */

                                        if (v & 1) t[k] = 0;

                                        j[k] = 0; i[k]++; continue;

                                }

                                data[k][i[k]] |= (~v & 1) << (j[k]++ - 1);      /* Data bit */

                        }

                        t[k]--;

                }

        } while (t[0] > 0 || t[1] > 0);

        local_irq_restore(flags);

        return (i[0] == TMDC_MAX_LENGTH) | ((i[1] == TMDC_MAX_LENGTH) << 1);

}

static int tmdc_parse_packet(struct tmdc_port *port, unsigned char *data)

{

        int i, k, l;

        if (data[TMDC_BYTE_ID] != port->mode)

                return -1;

        for (i = 0; i < port->absc; i++) {

                if (port->abs[i] < 0)

                        return 0;

                input_report_abs(port->dev, port->abs[i], data[tmdc_byte_a[i]]);

        }

        switch (port->mode) {

                case TMDC_MODE_M3DI:

                        i = tmdc_byte_d[0];

                        input_report_abs(port->dev, ABS_HAT0X, ((data[i] >> 3) & 1) - ((data[i] >> 1) & 1));

                        input_report_abs(port->dev, ABS_HAT0Y, ((data[i] >> 2) & 1) - ( data[i]       & 1));

                        break;

                case TMDC_MODE_AT:

                        i = tmdc_byte_a[3];

                        input_report_abs(port->dev, ABS_HAT0X, tmdc_hat_to_axis[(data[i] - 141) / 25].x);

                        input_report_abs(port->dev, ABS_HAT0Y, tmdc_hat_to_axis[(data[i] - 141) / 25].y);

                        break;

        }

        for (k = l = 0; k < 4; k++) {

                for (i = 0; i < port->btnc[k]; i++)

                        input_report_key(port->dev, port->btn[i + l],

                                ((data[tmdc_byte_d[k]] >> (i + port->btno[k])) & 1));

                l += port->btnc[k];

        }

        input_sync(port->dev);

        return 0;

}

/*

 * tmdc_poll() reads and analyzes ThrustMaster joystick data.

 */

static void tmdc_poll(struct gameport *gameport)

{

        unsigned char data[2][TMDC_MAX_LENGTH];

        struct tmdc *tmdc = gameport_get_drvdata(gameport);

        unsigned char r, bad = 0;

        int i;

        tmdc->reads++;

        if ((r = tmdc_read_packet(tmdc->gameport, data)) != tmdc->exists)

                bad = 1;

        else {

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

                        if (r & (1 << i) & tmdc->exists) {

                                if (tmdc_parse_packet(tmdc->port[i], data[i]))

                                        bad = 1;

                        }

                }

        }

        tmdc->bads += bad;

}

static int tmdc_open(struct input_dev *dev)

{

        struct tmdc *tmdc = input_get_drvdata(dev);

        gameport_start_polling(tmdc->gameport);

        return 0;

}

static void tmdc_close(struct input_dev *dev)

{

        struct tmdc *tmdc = input_get_drvdata(dev);

        gameport_stop_polling(tmdc->gameport);

}

static int tmdc_setup_port(struct tmdc *tmdc, int idx, unsigned char *data)

{

        const struct tmdc_model *model;

        struct tmdc_port *port;

        struct input_dev *input_dev;

        int i, j, b = 0;

        int err;

        tmdc->port[idx] = port = kzalloc(sizeof (struct tmdc_port), GFP_KERNEL);

        input_dev = input_allocate_device();

        if (!port || !input_dev) {

                err = -ENOMEM;

                goto fail;

        }

        port->mode = data[TMDC_BYTE_ID];

        for (model = tmdc_models; model->id && model->id != port->mode; model++)

                /* empty */;

        port->abs = model->axes;

        port->btn = model->buttons;

        if (!model->id) {

                port->absc = data[TMDC_BYTE_DEF] >> 4;

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

                        port->btnc[i] = i < (data[TMDC_BYTE_DEF] & 0xf) ? 8 : 0;

        } else {

                port->absc = model->abs;

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

                        port->btnc[i] = model->btnc[i];

        }

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

                port->btno[i] = model->btno[i];

        snprintf(port->name, sizeof(port->name), model->name,

                 port->absc, (data[TMDC_BYTE_DEF] & 0xf) << 3, port->mode);

        snprintf(port->phys, sizeof(port->phys), "%s/input%d", tmdc->gameport->phys, i);

        port->dev = input_dev;

        input_dev->name = port->name;

        input_dev->phys = port->phys;

        input_dev->id.bustype = BUS_GAMEPORT;

        input_dev->id.vendor = GAMEPORT_ID_VENDOR_THRUSTMASTER;

        input_dev->id.product = model->id;

        input_dev->id.version = 0x0100;

        input_dev->dev.parent = &tmdc->gameport->dev;

        input_set_drvdata(input_dev, tmdc);

        input_dev->open = tmdc_open;

        input_dev->close = tmdc_close;

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

        for (i = 0; i < port->absc && i < TMDC_ABS; i++)

                if (port->abs[i] >= 0)

                        input_set_abs_params(input_dev, port->abs[i], 8, 248, 2, 4);

        for (i = 0; i < model->hats && i < TMDC_ABS_HAT; i++)

                input_set_abs_params(input_dev, tmdc_abs_hat[i], -1, 1, 0, 0);

        for (i = 0; i < 4; i++) {

                for (j = 0; j < port->btnc[i] && j < TMDC_BTN; j++)

                        set_bit(port->btn[j + b], input_dev->keybit);

                b += port->btnc[i];

        }

        err = input_register_device(port->dev);

        if (err)

                goto fail;

        return 0;

 fail:  input_free_device(input_dev);

        kfree(port);

        return err;

}

/*

 * tmdc_probe() probes for ThrustMaster type joysticks.

 */

static int tmdc_connect(struct gameport *gameport, struct gameport_driver *drv)

{

        unsigned char data[2][TMDC_MAX_LENGTH];

        struct tmdc *tmdc;

        int i;

        int err;

        if (!(tmdc = kzalloc(sizeof(struct tmdc), GFP_KERNEL)))

                return -ENOMEM;

        tmdc->gameport = gameport;

        gameport_set_drvdata(gameport, tmdc);

        err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);

        if (err)

                goto fail1;

        if (!(tmdc->exists = tmdc_read_packet(gameport, data))) {

                err = -ENODEV;

                goto fail2;

        }

        gameport_set_poll_handler(gameport, tmdc_poll);

        gameport_set_poll_interval(gameport, 20);

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

                if (tmdc->exists & (1 << i)) {

                        err = tmdc_setup_port(tmdc, i, data[i]);

                        if (err)

                                goto fail3;

                }

        }

        return 0;

 fail3: while (--i >= 0) {

                if (tmdc->port[i]) {

                        input_unregister_device(tmdc->port[i]->dev);

                        kfree(tmdc->port[i]);

                }

        }

 fail2: gameport_close(gameport);

 fail1: gameport_set_drvdata(gameport, NULL);

        kfree(tmdc);

        return err;

}

static void tmdc_disconnect(struct gameport *gameport)

{

        struct tmdc *tmdc = gameport_get_drvdata(gameport);

        int i;

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

                if (tmdc->port[i]) {

                        input_unregister_device(tmdc->port[i]->dev);

                        kfree(tmdc->port[i]);

                }

        }

        gameport_close(gameport);

        gameport_set_drvdata(gameport, NULL);

        kfree(tmdc);

}

static struct gameport_driver tmdc_drv = {

        .driver         = {

                .name   = "tmdc",

                .owner  = THIS_MODULE,

        },

        .description    = DRIVER_DESC,

        .connect        = tmdc_connect,

        .disconnect     = tmdc_disconnect,

};

static int __init tmdc_init(void)

{

        gameport_register_driver(&tmdc_drv);

        return 0;

}

static void __exit tmdc_exit(void)

{

        gameport_unregister_driver(&tmdc_drv);

}

module_init(tmdc_init);

module_exit(tmdc_exit);