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/*

 * $Id: spaceorb.c,v 1.15 2002/01/22 20:29:19 vojtech Exp $

 *

 *  Copyright (c) 1999-2001 Vojtech Pavlik

 *

 *  Based on the work of:

 *      David Thompson

 */

/*

 * 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@ucw.cz>, or by paper mail:

 * Vojtech Pavlik, Simunkova 1594, 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>

#define DRIVER_DESC     "SpaceTec SpaceOrb 360 and Avenger 6dof controller driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

/*

 * Constants.

 */

#define SPACEORB_MAX_LENGTH     64

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

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

/*

 * Per-Orb data.

 */

struct spaceorb {

        struct input_dev *dev;

        int idx;

        unsigned char data[SPACEORB_MAX_LENGTH];

        char phys[32];

};

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: %s [%s] is %s\n",

                                 dev->name, spaceorb->data + i, spaceorb->phys);

                        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 < 6; 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 < 6; 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 "spaceorb: Device error. [ ");

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

                        printk("]\n");

                        break;

        }

        input_sync(dev);

}

static irqreturn_t spaceorb_interrupt(struct serio *serio,

                unsigned char data, unsigned int flags)

{

        struct spaceorb* spaceorb = serio_get_drvdata(serio);

        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;

        return IRQ_HANDLED;

}

/*

 * spaceorb_disconnect() is the opposite of spaceorb_connect()

 */

static void spaceorb_disconnect(struct serio *serio)

{

        struct spaceorb* spaceorb = serio_get_drvdata(serio);

        serio_close(serio);

        serio_set_drvdata(serio, NULL);

        input_unregister_device(spaceorb->dev);

        kfree(spaceorb);

}

/*

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

 * new serio device that supports SpaceOrb/Avenger protocol and registers

 * it as an input device.

 */

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

{

        struct spaceorb *spaceorb;

        struct input_dev *input_dev;

        int err = -ENOMEM;

        int i;

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

        input_dev = input_allocate_device();

        if (!spaceorb || !input_dev)

                goto fail1;

        spaceorb->dev = input_dev;

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

        input_dev->name = "SpaceTec SpaceOrb 360 / Avenger";

        input_dev->phys = spaceorb->phys;

        input_dev->id.bustype = BUS_RS232;

        input_dev->id.vendor = SERIO_SPACEORB;

        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 < 6; i++)

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

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

                input_set_abs_params(input_dev, spaceorb_axes[i], -508, 508, 0, 0);

        serio_set_drvdata(serio, spaceorb);

        err = serio_open(serio, drv);

        if (err)

                goto fail2;

        err = input_register_device(spaceorb->dev);

        if (err)

                goto fail3;

        return 0;

 fail3: serio_close(serio);

 fail2: serio_set_drvdata(serio, NULL);

 fail1: input_free_device(input_dev);

        kfree(spaceorb);

        return err;

}

/*

 * The serio driver structure.

 */

static struct serio_device_id spaceorb_serio_ids[] = {

        {

                .type   = SERIO_RS232,

                .proto  = SERIO_SPACEORB,

                .id     = SERIO_ANY,

                .extra  = SERIO_ANY,

        },

        { 0 }

};

MODULE_DEVICE_TABLE(serio, spaceorb_serio_ids);

static struct serio_driver spaceorb_drv = {

        .driver         = {

                .name   = "spaceorb",

        },

        .description    = DRIVER_DESC,

        .id_table       = spaceorb_serio_ids,

        .interrupt      = spaceorb_interrupt,

        .connect        = spaceorb_connect,

        .disconnect     = spaceorb_disconnect,

};

/*

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

 */

static int __init spaceorb_init(void)

{

        return serio_register_driver(&spaceorb_drv);

}

static void __exit spaceorb_exit(void)

{

        serio_unregister_driver(&spaceorb_drv);

}

module_init(spaceorb_init);

module_exit(spaceorb_exit);