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/*

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

 *

 *  Copyright (c) 1999-2000 Vojtech Pavlik

 *

 *  Based on the work of:

 *      David Thompson

 *

 *  Sponsored by SuSE

 */

/*

 * SpaceTec SpaceOrb 360 and Avenger 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@suse.cz>, or by paper mail:

 * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic

 */

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/input.h>

#include <linux/serio.h>

/*

 * Constants.

 */

#define SPACEORB_MAX_LENGTH     64

static int spaceorb_buttons[] = { BTN_TL, BTN_TR, BTN_Y, BTN_X, BTN_B, BTN_A, BTN_MODE};

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

static char *spaceorb_name = "SpaceTec SpaceOrb 360";

/*

 * Per-Orb data.

 */

struct spaceorb {

        struct input_dev dev;

        struct serio *serio;

        int idx;

        unsigned char data[SPACEORB_MAX_LENGTH];

};

static unsigned char spaceorb_xor[] = "SpaceWare";

static unsigned char *spaceorb_errors[] = { "EEPROM storing 0 failed", "Receive queue overflow", "Transmit queue timeout",

                "Bad packet", "Power brown-out", "EEPROM checksum error", "Hardware fault" };

/*

 * spaceorb_process_packet() decodes packets the driver receives from the

 * SpaceOrb.

 */

static void spaceorb_process_packet(struct spaceorb *spaceorb)

{

        struct input_dev *dev = &spaceorb->dev;

        unsigned char *data = spaceorb->data;

        unsigned char c = 0;

        int axes[6];

        int i;

        if (spaceorb->idx < 2) return;

        for (i = 0; i < spaceorb->idx; i++) c ^= data[i];

        if (c) return;

        switch (data[0]) {

                case 'R':                               /* Reset packet */

                        spaceorb->data[spaceorb->idx - 1] = 0;

                        for (i = 1; i < spaceorb->idx && spaceorb->data[i] == ' '; i++);

                        printk(KERN_INFO "input%d: %s [%s] on serio%d\n",

                                 spaceorb->dev.number, spaceorb_name, spaceorb->data + i, spaceorb->serio->number);

                        break;

                case 'D':                               /* Ball + button data */

                        if (spaceorb->idx != 12) return;

                        for (i = 0; i < 9; i++) spaceorb->data[i+2] ^= spaceorb_xor[i];

                        axes[0] = ( data[2]       << 3) | (data[ 3] >> 4);

                        axes[1] = ((data[3] & 0x0f) << 6) | (data[ 4] >> 1);

                        axes[2] = ((data[4] & 0x01) << 9) | (data[ 5] << 2) | (data[4] >> 5);

                        axes[3] = ((data[6] & 0x1f) << 5) | (data[ 7] >> 2);

                        axes[4] = ((data[7] & 0x03) << 8) | (data[ 8] << 1) | (data[7] >> 6);

                        axes[5] = ((data[9] & 0x3f) << 4) | (data[10] >> 3);

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

                                input_report_abs(dev, spaceorb_axes[i], axes[i] - ((axes[i] & 0x200) ? 1024 : 0));

                        for (i = 0; i < 8; i++)

                                input_report_key(dev, spaceorb_buttons[i], (data[1] >> i) & 1);

                        break;

                case 'K':                               /* Button data */

                        if (spaceorb->idx != 5) return;

                        for (i = 0; i < 7; i++)

                                input_report_key(dev, spaceorb_buttons[i], (data[2] >> i) & 1);

                        break;

                case 'E':                               /* Error packet */

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

                        printk(KERN_ERR "joy-spaceorb: Device error. [ ");

                        for (i = 0; i < 7; i++) if (data[1] & (1 << i)) printk("%s ", spaceorb_errors[i]);

                        printk("]\n");

                        break;

        }

}

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

{

        struct spaceorb* spaceorb = serio->private;

        if (~data & 0x80) {

                if (spaceorb->idx) spaceorb_process_packet(spaceorb);

                spaceorb->idx = 0;

        }

        if (spaceorb->idx < SPACEORB_MAX_LENGTH)

                spaceorb->data[spaceorb->idx++] = data & 0x7f;

}

/*

 * spaceorb_disconnect() is the opposite of spaceorb_connect()

 */

static void spaceorb_disconnect(struct serio *serio)

{

        struct spaceorb* spaceorb = serio->private;

        input_unregister_device(&spaceorb->dev);

        serio_close(serio);

        kfree(spaceorb);

}

/*

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

 * new serio device. It looks for the SpaceOrb/Avenger, and if found, registers

 * it as an input device.

 */

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

{

        struct spaceorb *spaceorb;

        int i, t;

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

                return;

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

                return;

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

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

        for (i = 0; i < 7; i++)

                set_bit(spaceorb_buttons[i], &spaceorb->dev.keybit);

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

                t = spaceorb_axes[i];

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

                spaceorb->dev.absmin[t] = -508;

                spaceorb->dev.absmax[t] =  508;

        }

        spaceorb->serio = serio;

        spaceorb->dev.private = spaceorb;

        spaceorb->dev.name = spaceorb_name;

        spaceorb->dev.idbus = BUS_RS232;

        spaceorb->dev.idvendor = SERIO_SPACEORB;

        spaceorb->dev.idproduct = 0x0001;

        spaceorb->dev.idversion = 0x0100;

        serio->private = spaceorb;

        if (serio_open(serio, dev)) {

                kfree(spaceorb);

                return;

        }

        input_register_device(&spaceorb->dev);

}

/*

 * The serio device structure.

 */

static struct serio_dev spaceorb_dev = {

        interrupt:      spaceorb_interrupt,

        connect:        spaceorb_connect,

        disconnect:     spaceorb_disconnect,

};

/*

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

 */

int __init spaceorb_init(void)

{

        serio_register_device(&spaceorb_dev);

        return 0;

}

void __exit spaceorb_exit(void)

{

        serio_unregister_device(&spaceorb_dev);

}

module_init(spaceorb_init);

module_exit(spaceorb_exit);

MODULE_LICENSE("GPL");