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/*

 * $Id: magellan.c,v 1.1.1.1 2004-04-15 02:03:27 phoenix Exp $

 *

 *  Copyright (c) 1999-2000 Vojtech Pavlik

 *

 *  Sponsored by SuSE

 */

/*

 * Magellan and Space Mouse 6dof controller 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, 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>

/*

 * Definitions & global arrays.

 */

#define MAGELLAN_MAX_LENGTH     32

static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8};

static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ};

static char *magellan_name = "LogiCad3D Magellan";

/*

 * Per-Magellan data.

 */

struct magellan {

        struct input_dev dev;

        int idx;

        unsigned char data[MAGELLAN_MAX_LENGTH];

};

/*

 * magellan_crunch_nibbles() verifies that the bytes sent from the Magellan

 * have correct upper nibbles for the lower ones, if not, the packet will

 * be thrown away. It also strips these upper halves to simplify further

 * processing.

 */

static int magellan_crunch_nibbles(unsigned char *data, int count)

{

        static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";

        do {

                if (data[count] == nibbles[data[count] & 0xf])

                        data[count] = data[count] & 0xf;

                else

                        return -1;

        } while (--count);

        return 0;

}

static void magellan_process_packet(struct magellan* magellan)

{

        struct input_dev *dev = &magellan->dev;

        unsigned char *data = magellan->data;

        int i, t;

        if (!magellan->idx) return;

        switch (magellan->data[0]) {

                case 'd':                               /* Axis data */

                        if (magellan->idx != 25) return;

                        if (magellan_crunch_nibbles(data, 24)) return;

                        for (i = 0; i < 6; i++)

                                input_report_abs(dev, magellan_axes[i],

                                        (data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 |

                                         data[(i << 2) + 3] <<  4 | data[(i << 2) + 4]) - 32768);

                        break;

                case 'k':                               /* Button data */

                        if (magellan->idx != 4) return;

                        if (magellan_crunch_nibbles(data, 3)) return;

                        t = (data[1] << 1) | (data[2] << 5) | data[3];

                        for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1);

                        break;

        }

}

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

{

        struct magellan* magellan = serio->private;

        if (data == '\r') {

                magellan_process_packet(magellan);

                magellan->idx = 0;

        } else {

                if (magellan->idx < MAGELLAN_MAX_LENGTH)

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

        }

}

/*

 * magellan_disconnect() is the opposite of magellan_connect()

 */

static void magellan_disconnect(struct serio *serio)

{

        struct magellan* magellan = serio->private;

        input_unregister_device(&magellan->dev);

        serio_close(serio);

        kfree(magellan);

}

/*

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

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

 * it as an input device.

 */

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

{

        struct magellan *magellan;

        int i, t;

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

                return;

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

                return;

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

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

        for (i = 0; i < 9; i++)

                set_bit(magellan_buttons[i], &magellan->dev.keybit);

        for (i = 0; i < 6; i++) {

                t = magellan_axes[i];

                set_bit(t, magellan->dev.absbit);

                magellan->dev.absmin[t] = -360;

                magellan->dev.absmax[t] =  360;

        }

        magellan->dev.private = magellan;

        magellan->dev.name = magellan_name;

        magellan->dev.idbus = BUS_RS232;

        magellan->dev.idvendor = SERIO_MAGELLAN;

        magellan->dev.idproduct = 0x0001;

        magellan->dev.idversion = 0x0100;

        serio->private = magellan;

        if (serio_open(serio, dev)) {

                kfree(magellan);

                return;

        }

        input_register_device(&magellan->dev);

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

}

/*

 * The serio device structure.

 */

static struct serio_dev magellan_dev = {

        interrupt:      magellan_interrupt,

        connect:        magellan_connect,

        disconnect:     magellan_disconnect,

};

/*

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

 */

int __init magellan_init(void)

{

        serio_register_device(&magellan_dev);

        return 0;

}

void __exit magellan_exit(void)

{

        serio_unregister_device(&magellan_dev);

}

module_init(magellan_init);

module_exit(magellan_exit);

MODULE_LICENSE("GPL");