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/*

 * $Id: spaceball.c,v 1.17 2002/01/22 20:29:03 vojtech Exp $

 *

 *  Copyright (c) 1999-2001 Vojtech Pavlik

 *

 *  Based on the work of:

 *      David Thompson

 *      Joseph Krahn

 */

/*

 * SpaceTec SpaceBall 2003/3003/4000 FLX 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 SpaceBall 2003/3003/4000 FLX driver"

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

MODULE_DESCRIPTION(DRIVER_DESC);

MODULE_LICENSE("GPL");

/*

 * Constants.

 */

#define SPACEBALL_MAX_LENGTH    128

#define SPACEBALL_MAX_ID        9

#define SPACEBALL_1003      1

#define SPACEBALL_2003B     3

#define SPACEBALL_2003C     4

#define SPACEBALL_3003C     7

#define SPACEBALL_4000FLX   8

#define SPACEBALL_4000FLX_L 9

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

static char *spaceball_names[] = {

        "?", "SpaceTec SpaceBall 1003", "SpaceTec SpaceBall 2003", "SpaceTec SpaceBall 2003B",

        "SpaceTec SpaceBall 2003C", "SpaceTec SpaceBall 3003", "SpaceTec SpaceBall SpaceController",

        "SpaceTec SpaceBall 3003C", "SpaceTec SpaceBall 4000FLX", "SpaceTec SpaceBall 4000FLX Lefty" };

/*

 * Per-Ball data.

 */

struct spaceball {

        struct input_dev *dev;

        int idx;

        int escape;

        unsigned char data[SPACEBALL_MAX_LENGTH];

        char phys[32];

};

/*

 * spaceball_process_packet() decodes packets the driver receives from the

 * SpaceBall.

 */

static void spaceball_process_packet(struct spaceball* spaceball)

{

        struct input_dev *dev = spaceball->dev;

        unsigned char *data = spaceball->data;

        int i;

        if (spaceball->idx < 2) return;

        switch (spaceball->data[0]) {

                case 'D':                                       /* Ball data */

                        if (spaceball->idx != 15) return;

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

                                input_report_abs(dev, spaceball_axes[i],

                                        (__s16)((data[2 * i + 3] << 8) | data[2 * i + 2]));

                        break;

                case 'K':                                       /* Button data */

                        if (spaceball->idx != 3) return;

                        input_report_key(dev, BTN_1, (data[2] & 0x01) || (data[2] & 0x20));

                        input_report_key(dev, BTN_2, data[2] & 0x02);

                        input_report_key(dev, BTN_3, data[2] & 0x04);

                        input_report_key(dev, BTN_4, data[2] & 0x08);

                        input_report_key(dev, BTN_5, data[1] & 0x01);

                        input_report_key(dev, BTN_6, data[1] & 0x02);

                        input_report_key(dev, BTN_7, data[1] & 0x04);

                        input_report_key(dev, BTN_8, data[1] & 0x10);

                        break;

                case '.':                                       /* Advanced button data */

                        if (spaceball->idx != 3) return;

                        input_report_key(dev, BTN_1, data[2] & 0x01);

                        input_report_key(dev, BTN_2, data[2] & 0x02);

                        input_report_key(dev, BTN_3, data[2] & 0x04);

                        input_report_key(dev, BTN_4, data[2] & 0x08);

                        input_report_key(dev, BTN_5, data[2] & 0x10);

                        input_report_key(dev, BTN_6, data[2] & 0x20);

                        input_report_key(dev, BTN_7, data[2] & 0x80);

                        input_report_key(dev, BTN_8, data[1] & 0x01);

                        input_report_key(dev, BTN_9, data[1] & 0x02);

                        input_report_key(dev, BTN_A, data[1] & 0x04);

                        input_report_key(dev, BTN_B, data[1] & 0x08);

                        input_report_key(dev, BTN_C, data[1] & 0x10);

                        input_report_key(dev, BTN_MODE, data[1] & 0x20);

                        break;

                case 'E':                                       /* Device error */

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

                        printk(KERN_ERR "spaceball: Device error. [%s]\n", spaceball->data + 1);

                        break;

                case '?':                                       /* Bad command packet */

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

                        printk(KERN_ERR "spaceball: Bad command. [%s]\n", spaceball->data + 1);

                        break;

        }

        input_sync(dev);

}

/*

 * Spaceball 4000 FLX packets all start with a one letter packet-type decriptor,

 * and end in 0x0d. It uses '^' as an escape for CR, XOFF and XON characters which

 * can occur in the axis values.

 */

static irqreturn_t spaceball_interrupt(struct serio *serio,

                unsigned char data, unsigned int flags)

{

        struct spaceball *spaceball = serio_get_drvdata(serio);

        switch (data) {

                case 0xd:

                        spaceball_process_packet(spaceball);

                        spaceball->idx = 0;

                        spaceball->escape = 0;

                        break;

                case '^':

                        if (!spaceball->escape) {

                                spaceball->escape = 1;

                                break;

                        }

                        spaceball->escape = 0;

                case 'M':

                case 'Q':

                case 'S':

                        if (spaceball->escape) {

                                spaceball->escape = 0;

                                data &= 0x1f;

                        }

                default:

                        if (spaceball->escape)

                                spaceball->escape = 0;

                        if (spaceball->idx < SPACEBALL_MAX_LENGTH)

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

                        break;

        }

        return IRQ_HANDLED;

}

/*

 * spaceball_disconnect() is the opposite of spaceball_connect()

 */

static void spaceball_disconnect(struct serio *serio)

{

        struct spaceball* spaceball = serio_get_drvdata(serio);

        serio_close(serio);

        serio_set_drvdata(serio, NULL);

        input_unregister_device(spaceball->dev);

        kfree(spaceball);

}

/*

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

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

 * an input device.

 */

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

{

        struct spaceball *spaceball;

        struct input_dev *input_dev;

        int err = -ENOMEM;

        int i, id;

        if ((id = serio->id.id) > SPACEBALL_MAX_ID)

                return -ENODEV;

        spaceball = kmalloc(sizeof(struct spaceball), GFP_KERNEL);

        input_dev = input_allocate_device();

        if (!spaceball || !input_dev)

                goto fail1;

        spaceball->dev = input_dev;

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

        input_dev->name = spaceball_names[id];

        input_dev->phys = spaceball->phys;

        input_dev->id.bustype = BUS_RS232;

        input_dev->id.vendor = SERIO_SPACEBALL;

        input_dev->id.product = id;

        input_dev->id.version = 0x0100;

        input_dev->dev.parent = &serio->dev;

        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);

        switch (id) {

                case SPACEBALL_4000FLX:

                case SPACEBALL_4000FLX_L:

                        input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_9);

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

                                BIT_MASK(BTN_B) | BIT_MASK(BTN_C) |

                                BIT_MASK(BTN_MODE);

                default:

                        input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_2) |

                                BIT_MASK(BTN_3) | BIT_MASK(BTN_4) |

                                BIT_MASK(BTN_5) | BIT_MASK(BTN_6) |

                                BIT_MASK(BTN_7) | BIT_MASK(BTN_8);

                case SPACEBALL_3003C:

                        input_dev->keybit[BIT_WORD(BTN_0)] |= BIT_MASK(BTN_1) |

                                BIT_MASK(BTN_8);

        }

        for (i = 0; i < 3; i++) {

                input_set_abs_params(input_dev, ABS_X + i, -8000, 8000, 8, 40);

                input_set_abs_params(input_dev, ABS_RX + i, -1600, 1600, 2, 8);

        }

        serio_set_drvdata(serio, spaceball);

        err = serio_open(serio, drv);

        if (err)

                goto fail2;

        err = input_register_device(spaceball->dev);

        if (err)

                goto fail3;

        return 0;

 fail3: serio_close(serio);

 fail2: serio_set_drvdata(serio, NULL);

 fail1: input_free_device(input_dev);

        kfree(spaceball);

        return err;

}

/*

 * The serio driver structure.

 */

static struct serio_device_id spaceball_serio_ids[] = {

        {

                .type   = SERIO_RS232,

                .proto  = SERIO_SPACEBALL,

                .id     = SERIO_ANY,

                .extra  = SERIO_ANY,

        },

        { 0 }

};

MODULE_DEVICE_TABLE(serio, spaceball_serio_ids);

static struct serio_driver spaceball_drv = {

        .driver         = {

                .name   = "spaceball",

        },

        .description    = DRIVER_DESC,

        .id_table       = spaceball_serio_ids,

        .interrupt      = spaceball_interrupt,

        .connect        = spaceball_connect,

        .disconnect     = spaceball_disconnect,

};

/*

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

 */

static int __init spaceball_init(void)

{

        return serio_register_driver(&spaceball_drv);

}

static void __exit spaceball_exit(void)

{

        serio_unregister_driver(&spaceball_drv);

}

module_init(spaceball_init);

module_exit(spaceball_exit);