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/*

 * $Id: magellan.c,v 1.16 2002/01/22 20:28:39 vojtech Exp $

 *

 *  Copyright (c) 1999-2001 Vojtech Pavlik

 */

/*

 * 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, 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     "Magellan and SpaceMouse 6dof controller driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

/*

 * 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 };

/*

 * Per-Magellan data.

 */

struct magellan {

        struct input_dev *dev;

        int idx;

        unsigned char data[MAGELLAN_MAX_LENGTH];

        char phys[32];

};

/*

 * 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;

        }

        input_sync(dev);

}

static irqreturn_t magellan_interrupt(struct serio *serio,

                unsigned char data, unsigned int flags)

{

        struct magellan* magellan = serio_get_drvdata(serio);

        if (data == '\r') {

                magellan_process_packet(magellan);

                magellan->idx = 0;

        } else {

                if (magellan->idx < MAGELLAN_MAX_LENGTH)

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

        }

        return IRQ_HANDLED;

}

/*

 * magellan_disconnect() is the opposite of magellan_connect()

 */

static void magellan_disconnect(struct serio *serio)

{

        struct magellan* magellan = serio_get_drvdata(serio);

        serio_close(serio);

        serio_set_drvdata(serio, NULL);

        input_unregister_device(magellan->dev);

        kfree(magellan);

}

/*

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

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

 * an input device.

 */

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

{

        struct magellan *magellan;

        struct input_dev *input_dev;

        int err = -ENOMEM;

        int i;

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

        input_dev = input_allocate_device();

        if (!magellan || !input_dev)

                goto fail1;

        magellan->dev = input_dev;

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

        input_dev->name = "LogiCad3D Magellan / SpaceMouse";

        input_dev->phys = magellan->phys;

        input_dev->id.bustype = BUS_RS232;

        input_dev->id.vendor = SERIO_MAGELLAN;

        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);

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

                set_bit(magellan_buttons[i], input_dev->keybit);

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

                input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0);

        serio_set_drvdata(serio, magellan);

        err = serio_open(serio, drv);

        if (err)

                goto fail2;

        err = input_register_device(magellan->dev);

        if (err)

                goto fail3;

        return 0;

 fail3: serio_close(serio);

 fail2: serio_set_drvdata(serio, NULL);

 fail1: input_free_device(input_dev);

        kfree(magellan);

        return err;

}

/*

 * The serio driver structure.

 */

static struct serio_device_id magellan_serio_ids[] = {

        {

                .type   = SERIO_RS232,

                .proto  = SERIO_MAGELLAN,

                .id     = SERIO_ANY,

                .extra  = SERIO_ANY,

        },

        { 0 }

};

MODULE_DEVICE_TABLE(serio, magellan_serio_ids);

static struct serio_driver magellan_drv = {

        .driver         = {

                .name   = "magellan",

        },

        .description    = DRIVER_DESC,

        .id_table       = magellan_serio_ids,

        .interrupt      = magellan_interrupt,

        .connect        = magellan_connect,

        .disconnect     = magellan_disconnect,

};

/*

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

 */

static int __init magellan_init(void)

{

        return serio_register_driver(&magellan_drv);

}

static void __exit magellan_exit(void)

{

        serio_unregister_driver(&magellan_drv);

}

module_init(magellan_init);

module_exit(magellan_exit);