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/*

 * $Id: warrior.c,v 1.14 2002/01/22 20:32:10 vojtech Exp $

 *

 *  Copyright (c) 1999-2001 Vojtech Pavlik

 */

/*

 * Logitech WingMan Warrior joystick 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     "Logitech WingMan Warrior joystick driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

/*

 * Constants.

 */

#define WARRIOR_MAX_LENGTH      16

static char warrior_lengths[] = { 0, 4, 12, 3, 4, 4, 0, 0 };

/*

 * Per-Warrior data.

 */

struct warrior {

        struct input_dev *dev;

        int idx, len;

        unsigned char data[WARRIOR_MAX_LENGTH];

        char phys[32];

};

/*

 * warrior_process_packet() decodes packets the driver receives from the

 * Warrior. It updates the data accordingly.

 */

static void warrior_process_packet(struct warrior *warrior)

{

        struct input_dev *dev = warrior->dev;

        unsigned char *data = warrior->data;

        if (!warrior->idx) return;

        switch ((data[0] >> 4) & 7) {

                case 1:                                 /* Button data */

                        input_report_key(dev, BTN_TRIGGER,  data[3]       & 1);

                        input_report_key(dev, BTN_THUMB,   (data[3] >> 1) & 1);

                        input_report_key(dev, BTN_TOP,     (data[3] >> 2) & 1);

                        input_report_key(dev, BTN_TOP2,    (data[3] >> 3) & 1);

                        break;

                case 3:                                 /* XY-axis info->data */

                        input_report_abs(dev, ABS_X, ((data[0] & 8) << 5) - (data[2] | ((data[0] & 4) << 5)));

                        input_report_abs(dev, ABS_Y, (data[1] | ((data[0] & 1) << 7)) - ((data[0] & 2) << 7));

                        break;

                case 5:                                 /* Throttle, spinner, hat info->data */

                        input_report_abs(dev, ABS_THROTTLE, (data[1] | ((data[0] & 1) << 7)) - ((data[0] & 2) << 7));

                        input_report_abs(dev, ABS_HAT0X, (data[3] & 2 ? 1 : 0) - (data[3] & 1 ? 1 : 0));

                        input_report_abs(dev, ABS_HAT0Y, (data[3] & 8 ? 1 : 0) - (data[3] & 4 ? 1 : 0));

                        input_report_rel(dev, REL_DIAL,  (data[2] | ((data[0] & 4) << 5)) - ((data[0] & 8) << 5));

                        break;

        }

        input_sync(dev);

}

/*

 * warrior_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 warrior_interrupt(struct serio *serio,

                unsigned char data, unsigned int flags)

{

        struct warrior *warrior = serio_get_drvdata(serio);

        if (data & 0x80) {

                if (warrior->idx) warrior_process_packet(warrior);

                warrior->idx = 0;

                warrior->len = warrior_lengths[(data >> 4) & 7];

        }

        if (warrior->idx < warrior->len)

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

        if (warrior->idx == warrior->len) {

                if (warrior->idx) warrior_process_packet(warrior);

                warrior->idx = 0;

                warrior->len = 0;

        }

        return IRQ_HANDLED;

}

/*

 * warrior_disconnect() is the opposite of warrior_connect()

 */

static void warrior_disconnect(struct serio *serio)

{

        struct warrior *warrior = serio_get_drvdata(serio);

        serio_close(serio);

        serio_set_drvdata(serio, NULL);

        input_unregister_device(warrior->dev);

        kfree(warrior);

}

/*

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

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

 * it as an input device.

 */

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

{

        struct warrior *warrior;

        struct input_dev *input_dev;

        int err = -ENOMEM;

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

        input_dev = input_allocate_device();

        if (!warrior || !input_dev)

                goto fail1;

        warrior->dev = input_dev;

        snprintf(warrior->phys, sizeof(warrior->phys), "%s/input0", serio->phys);

        input_dev->name = "Logitech WingMan Warrior";

        input_dev->phys = warrior->phys;

        input_dev->id.bustype = BUS_RS232;

        input_dev->id.vendor = SERIO_WARRIOR;

        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_REL) |

                BIT_MASK(EV_ABS);

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

                BIT_MASK(BTN_THUMB) | BIT_MASK(BTN_TOP) | BIT_MASK(BTN_TOP2);

        input_dev->relbit[0] = BIT_MASK(REL_DIAL);

        input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 8);

        input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 8);

        input_set_abs_params(input_dev, ABS_THROTTLE, -112, 112, 0, 0);

        input_set_abs_params(input_dev, ABS_HAT0X, -1, 1, 0, 0);

        input_set_abs_params(input_dev, ABS_HAT0Y, -1, 1, 0, 0);

        serio_set_drvdata(serio, warrior);

        err = serio_open(serio, drv);

        if (err)

                goto fail2;

        err = input_register_device(warrior->dev);

        if (err)

                goto fail3;

        return 0;

 fail3: serio_close(serio);

 fail2: serio_set_drvdata(serio, NULL);

 fail1: input_free_device(input_dev);

        kfree(warrior);

        return err;

}

/*

 * The serio driver structure.

 */

static struct serio_device_id warrior_serio_ids[] = {

        {

                .type   = SERIO_RS232,

                .proto  = SERIO_WARRIOR,

                .id     = SERIO_ANY,

                .extra  = SERIO_ANY,

        },

        { 0 }

};

MODULE_DEVICE_TABLE(serio, warrior_serio_ids);

static struct serio_driver warrior_drv = {

        .driver         = {

                .name   = "warrior",

        },

        .description    = DRIVER_DESC,

        .id_table       = warrior_serio_ids,

        .interrupt      = warrior_interrupt,

        .connect        = warrior_connect,

        .disconnect     = warrior_disconnect,

};

/*

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

 */

static int __init warrior_init(void)

{

        return serio_register_driver(&warrior_drv);

}

static void __exit warrior_exit(void)

{

        serio_unregister_driver(&warrior_drv);

}

module_init(warrior_init);

module_exit(warrior_exit);