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/*

 * $Id: stinger.c,v 1.10 2002/01/22 20:29:31 vojtech Exp $

 *

 *  Copyright (c) 2000-2001 Vojtech Pavlik

 *  Copyright (c) 2000 Mark Fletcher

 */

/*

 * 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, Simunkova 1594, 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>

#define DRIVER_DESC     "Gravis Stinger gamepad driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

/*

 * Constants.

 */

#define STINGER_MAX_LENGTH 8

/*

 * Per-Stinger data.

 */

struct stinger {

        struct input_dev *dev;

        int idx;

        unsigned char data[STINGER_MAX_LENGTH];

        char phys[32];

};

/*

 * 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));

        input_sync(dev);

        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 irqreturn_t stinger_interrupt(struct serio *serio,

        unsigned char data, unsigned int flags)

{

        struct stinger *stinger = serio_get_drvdata(serio);

        /* 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 IRQ_HANDLED;

}

/*

 * stinger_disconnect() is the opposite of stinger_connect()

 */

static void stinger_disconnect(struct serio *serio)

{

        struct stinger *stinger = serio_get_drvdata(serio);

        serio_close(serio);

        serio_set_drvdata(serio, NULL);

        input_unregister_device(stinger->dev);

        kfree(stinger);

}

/*

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

 * new serio device that supports Stinger protocol and registers it as

 * an input device.

 */

static int stinger_connect(struct serio *serio, struct serio_driver *drv)

{

        struct stinger *stinger;

        struct input_dev *input_dev;

        int err = -ENOMEM;

        stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL);

        input_dev = input_allocate_device();

        if (!stinger || !input_dev)

                goto fail1;

        stinger->dev = input_dev;

        snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys);

        input_dev->name = "Gravis Stinger";

        input_dev->phys = stinger->phys;

        input_dev->id.bustype = BUS_RS232;

        input_dev->id.vendor = SERIO_STINGER;

        input_dev->id.product = 0x0001;

        input_dev->id.version = 0x0100;

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

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

        input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) |

                BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) |

                BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) |

                BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT);

        input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4);

        input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4);

        serio_set_drvdata(serio, stinger);

        err = serio_open(serio, drv);

        if (err)

                goto fail2;

        err = input_register_device(stinger->dev);

        if (err)

                goto fail3;

        return 0;

 fail3: serio_close(serio);

 fail2: serio_set_drvdata(serio, NULL);

 fail1: input_free_device(input_dev);

        kfree(stinger);

        return err;

}

/*

 * The serio driver structure.

 */

static struct serio_device_id stinger_serio_ids[] = {

        {

                .type   = SERIO_RS232,

                .proto  = SERIO_STINGER,

                .id     = SERIO_ANY,

                .extra  = SERIO_ANY,

        },

        { 0 }

};

MODULE_DEVICE_TABLE(serio, stinger_serio_ids);

static struct serio_driver stinger_drv = {

        .driver         = {

                .name   = "stinger",

        },

        .description    = DRIVER_DESC,

        .id_table       = stinger_serio_ids,

        .interrupt      = stinger_interrupt,

        .connect        = stinger_connect,

        .disconnect     = stinger_disconnect,

};

/*

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

 */

static int __init stinger_init(void)

{

        return serio_register_driver(&stinger_drv);

}

static void __exit stinger_exit(void)

{

        serio_unregister_driver(&stinger_drv);

}

module_init(stinger_init);

module_exit(stinger_exit);