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/*

 * $Id: interact.c,v 1.16 2002/01/22 20:28:25 vojtech Exp $

 *

 *  Copyright (c) 2001 Vojtech Pavlik

 *

 *  Based on the work of:

 *      Toby Deshane

 */

/*

 * InterAct digital gamepad/joystick 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/kernel.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/delay.h>

#include <linux/init.h>

#include <linux/gameport.h>

#include <linux/input.h>

#include <linux/jiffies.h>

#define DRIVER_DESC     "InterAct digital joystick driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

#define INTERACT_MAX_START      600     /* 400 us */

#define INTERACT_MAX_STROBE     60      /* 40 us */

#define INTERACT_MAX_LENGTH     32      /* 32 bits */

#define INTERACT_TYPE_HHFX      0        /* HammerHead/FX */

#define INTERACT_TYPE_PP8D      1       /* ProPad 8 */

struct interact {

        struct gameport *gameport;

        struct input_dev *dev;

        int bads;

        int reads;

        unsigned char type;

        unsigned char length;

        char phys[32];

};

static short interact_abs_hhfx[] =

        { ABS_RX, ABS_RY, ABS_X, ABS_Y, ABS_HAT0X, ABS_HAT0Y, -1 };

static short interact_abs_pp8d[] =

        { ABS_X, ABS_Y, -1 };

static short interact_btn_hhfx[] =

        { BTN_TR, BTN_X, BTN_Y, BTN_Z, BTN_A, BTN_B, BTN_C, BTN_TL, BTN_TL2, BTN_TR2, BTN_MODE, BTN_SELECT, -1 };

static short interact_btn_pp8d[] =

        { BTN_C, BTN_TL, BTN_TR, BTN_A, BTN_B, BTN_Y, BTN_Z, BTN_X, -1 };

struct interact_type {

        int id;

        short *abs;

        short *btn;

        char *name;

        unsigned char length;

        unsigned char b8;

};

static struct interact_type interact_type[] = {

        { 0x6202, interact_abs_hhfx, interact_btn_hhfx, "InterAct HammerHead/FX",    32, 4 },

        { 0x53f8, interact_abs_pp8d, interact_btn_pp8d, "InterAct ProPad 8 Digital", 16, 0 },

        { 0 }};

/*

 * interact_read_packet() reads and InterAct joystick data.

 */

static int interact_read_packet(struct gameport *gameport, int length, u32 *data)

{

        unsigned long flags;

        unsigned char u, v;

        unsigned int t, s;

        int i;

        i = 0;

        data[0] = data[1] = data[2] = 0;

        t = gameport_time(gameport, INTERACT_MAX_START);

        s = gameport_time(gameport, INTERACT_MAX_STROBE);

        local_irq_save(flags);

        gameport_trigger(gameport);

        v = gameport_read(gameport);

        while (t > 0 && i < length) {

                t--;

                u = v; v = gameport_read(gameport);

                if (v & ~u & 0x40) {

                        data[0] = (data[0] << 1) | ((v >> 4) & 1);

                        data[1] = (data[1] << 1) | ((v >> 5) & 1);

                        data[2] = (data[2] << 1) | ((v >> 7) & 1);

                        i++;

                        t = s;

                }

        }

        local_irq_restore(flags);

        return i;

}

/*

 * interact_poll() reads and analyzes InterAct joystick data.

 */

static void interact_poll(struct gameport *gameport)

{

        struct interact *interact = gameport_get_drvdata(gameport);

        struct input_dev *dev = interact->dev;

        u32 data[3];

        int i;

        interact->reads++;

        if (interact_read_packet(interact->gameport, interact->length, data) < interact->length) {

                interact->bads++;

        } else {

                for (i = 0; i < 3; i++)

                        data[i] <<= INTERACT_MAX_LENGTH - interact->length;

                switch (interact->type) {

                        case INTERACT_TYPE_HHFX:

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

                                        input_report_abs(dev, interact_abs_hhfx[i], (data[i & 1] >> ((i >> 1) << 3)) & 0xff);

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

                                        input_report_abs(dev, ABS_HAT0Y - i,

                                                ((data[1] >> ((i << 1) + 17)) & 1)  - ((data[1] >> ((i << 1) + 16)) & 1));

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

                                        input_report_key(dev, interact_btn_hhfx[i], (data[0] >> (i + 16)) & 1);

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

                                        input_report_key(dev, interact_btn_hhfx[i + 8], (data[1] >> (i + 20)) & 1);

                                break;

                        case INTERACT_TYPE_PP8D:

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

                                        input_report_abs(dev, interact_abs_pp8d[i],

                                                ((data[0] >> ((i << 1) + 20)) & 1)  - ((data[0] >> ((i << 1) + 21)) & 1));

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

                                        input_report_key(dev, interact_btn_pp8d[i], (data[1] >> (i + 16)) & 1);

                                break;

                }

        }

        input_sync(dev);

}

/*

 * interact_open() is a callback from the input open routine.

 */

static int interact_open(struct input_dev *dev)

{

        struct interact *interact = input_get_drvdata(dev);

        gameport_start_polling(interact->gameport);

        return 0;

}

/*

 * interact_close() is a callback from the input close routine.

 */

static void interact_close(struct input_dev *dev)

{

        struct interact *interact = input_get_drvdata(dev);

        gameport_stop_polling(interact->gameport);

}

/*

 * interact_connect() probes for InterAct joysticks.

 */

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

{

        struct interact *interact;

        struct input_dev *input_dev;

        __u32 data[3];

        int i, t;

        int err;

        interact = kzalloc(sizeof(struct interact), GFP_KERNEL);

        input_dev = input_allocate_device();

        if (!interact || !input_dev) {

                err = -ENOMEM;

                goto fail1;

        }

        interact->gameport = gameport;

        interact->dev = input_dev;

        gameport_set_drvdata(gameport, interact);

        err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW);

        if (err)

                goto fail1;

        i = interact_read_packet(gameport, INTERACT_MAX_LENGTH * 2, data);

        if (i != 32 || (data[0] >> 24) != 0x0c || (data[1] >> 24) != 0x02) {

                err = -ENODEV;

                goto fail2;

        }

        for (i = 0; interact_type[i].length; i++)

                if (interact_type[i].id == (data[2] >> 16))

                        break;

        if (!interact_type[i].length) {

                printk(KERN_WARNING "interact.c: Unknown joystick on %s. [len %d d0 %08x d1 %08x i2 %08x]\n",

                        gameport->phys, i, data[0], data[1], data[2]);

                err = -ENODEV;

                goto fail2;

        }

        gameport_set_poll_handler(gameport, interact_poll);

        gameport_set_poll_interval(gameport, 20);

        snprintf(interact->phys, sizeof(interact->phys), "%s/input0", gameport->phys);

        interact->type = i;

        interact->length = interact_type[i].length;

        input_dev->name = interact_type[i].name;

        input_dev->phys = interact->phys;

        input_dev->id.bustype = BUS_GAMEPORT;

        input_dev->id.vendor = GAMEPORT_ID_VENDOR_INTERACT;

        input_dev->id.product = interact_type[i].id;

        input_dev->id.version = 0x0100;

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

        input_set_drvdata(input_dev, interact);

        input_dev->open = interact_open;

        input_dev->close = interact_close;

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

        for (i = 0; (t = interact_type[interact->type].abs[i]) >= 0; i++) {

                set_bit(t, input_dev->absbit);

                if (i < interact_type[interact->type].b8) {

                        input_dev->absmin[t] = 0;

                        input_dev->absmax[t] = 255;

                } else {

                        input_dev->absmin[t] = -1;

                        input_dev->absmax[t] = 1;

                }

        }

        for (i = 0; (t = interact_type[interact->type].btn[i]) >= 0; i++)

                set_bit(t, input_dev->keybit);

        err = input_register_device(interact->dev);

        if (err)

                goto fail2;

        return 0;

fail2:  gameport_close(gameport);

fail1:  gameport_set_drvdata(gameport, NULL);

        input_free_device(input_dev);

        kfree(interact);

        return err;

}

static void interact_disconnect(struct gameport *gameport)

{

        struct interact *interact = gameport_get_drvdata(gameport);

        input_unregister_device(interact->dev);

        gameport_close(gameport);

        gameport_set_drvdata(gameport, NULL);

        kfree(interact);

}

static struct gameport_driver interact_drv = {

        .driver         = {

                .name   = "interact",

        },

        .description    = DRIVER_DESC,

        .connect        = interact_connect,

        .disconnect     = interact_disconnect,

};

static int __init interact_init(void)

{

        gameport_register_driver(&interact_drv);

        return 0;

}

static void __exit interact_exit(void)

{

        gameport_unregister_driver(&interact_drv);

}

module_init(interact_init);

module_exit(interact_exit);