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/*

 * $Id: stinger.c,v 1.1.1.1 2004-04-15 02:03:30 phoenix Exp $

 *

 *  Copyright (c) 2000-2001 Vojtech Pavlik

 *  Copyright (c) 2000 Mark Fletcher

 *

 *  Sponsored by SuSE

 */

/*

 * Gravis Stinger gamepad driver for Linux

 */

/*

 * This program is free warftware; 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, Ucitelska 1576, Prague 8, 182 00 Czech Republic

 */

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/input.h>

#include <linux/serio.h>

#include <linux/init.h>

/*

 * Constants.

 */

#define STINGER_MAX_LENGTH 8

static char *stinger_name = "Gravis Stinger";

/*

 * Per-Stinger data.

 */

struct stinger {

        struct input_dev dev;

        int idx;

        unsigned char data[STINGER_MAX_LENGTH];

};

/*

 * stinger_process_packet() decodes packets the driver receives from the

 * Stinger. It updates the data accordingly.

 */

static void stinger_process_packet(struct stinger *stinger)

{

        struct input_dev *dev = &stinger->dev;

        unsigned char *data = stinger->data;

        if (!stinger->idx) return;

        input_report_key(dev, BTN_A,      ((data[0] & 0x20) >> 5));

        input_report_key(dev, BTN_B,      ((data[0] & 0x10) >> 4));

        input_report_key(dev, BTN_C,      ((data[0] & 0x08) >> 3));

        input_report_key(dev, BTN_X,      ((data[0] & 0x04) >> 2));

        input_report_key(dev, BTN_Y,      ((data[3] & 0x20) >> 5));

        input_report_key(dev, BTN_Z,      ((data[3] & 0x10) >> 4));

        input_report_key(dev, BTN_TL,     ((data[3] & 0x08) >> 3));

        input_report_key(dev, BTN_TR,     ((data[3] & 0x04) >> 2));

        input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1));

        input_report_key(dev, BTN_START,   (data[3] & 0x01));

        input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6));

        input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F));

        return;

}

/*

 * stinger_interrupt() is called by the low level driver when characters

 * are ready for us. We then buffer them for further processing, or call the

 * packet processing routine.

 */

static void stinger_interrupt(struct serio *serio, unsigned char data, unsigned int flags)

{

        struct stinger* stinger = serio->private;

        /* All Stinger packets are 4 bytes */

        if (stinger->idx < STINGER_MAX_LENGTH)

                stinger->data[stinger->idx++] = data;

        if (stinger->idx == 4) {

                stinger_process_packet(stinger);

                stinger->idx = 0;

        }

        return;

}

/*

 * stinger_disconnect() is the opposite of stinger_connect()

 */

static void stinger_disconnect(struct serio *serio)

{

        struct stinger* stinger = serio->private;

        input_unregister_device(&stinger->dev);

        serio_close(serio);

        kfree(stinger);

}

/*

 * stinger_connect() is the routine that is called when someone adds a

 * new serio device. It looks for the Stinger, and if found, registers

 * it as an input device.

 */

static void stinger_connect(struct serio *serio, struct serio_dev *dev)

{

        struct stinger *stinger;

        int i;

        if (serio->type != (SERIO_RS232 | SERIO_STINGER))

                return;

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

                return;

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

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

        stinger->dev.keybit[LONG(BTN_A)] = BIT(BTN_A) | BIT(BTN_B) | BIT(BTN_C) | BIT(BTN_X) | \

                                           BIT(BTN_Y) | BIT(BTN_Z) | BIT(BTN_TL) | BIT(BTN_TR) | \

                                           BIT(BTN_START) | BIT(BTN_SELECT);

        stinger->dev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y);

        stinger->dev.name = stinger_name;

        stinger->dev.idbus = BUS_RS232;

        stinger->dev.idvendor = SERIO_STINGER;

        stinger->dev.idproduct = 0x0001;

        stinger->dev.idversion = 0x0100;

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

                stinger->dev.absmax[ABS_X+i] =  64;

                stinger->dev.absmin[ABS_X+i] = -64;

                stinger->dev.absflat[ABS_X+i] = 4;

        }

        stinger->dev.private = stinger;

        serio->private = stinger;

        if (serio_open(serio, dev)) {

                kfree(stinger);

                return;

        }

        input_register_device(&stinger->dev);

        printk(KERN_INFO "input%d: %s on serio%d\n", stinger->dev.number, stinger_name, serio->number);

}

/*

 * The serio device structure.

 */

static struct serio_dev stinger_dev = {

        interrupt:      stinger_interrupt,

        connect:        stinger_connect,

        disconnect:     stinger_disconnect,

};

/*

 * The functions for inserting/removing us as a module.

 */

int __init stinger_init(void)

{

        serio_register_device(&stinger_dev);

        return 0;

}

void __exit stinger_exit(void)

{

        serio_unregister_device(&stinger_dev);

}

module_init(stinger_init);

module_exit(stinger_exit);

MODULE_LICENSE("GPL");