amimouse.c

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/*
 *  Amiga mouse driver for Linux/m68k
 *
 *  Copyright (c) 2000-2002 Vojtech Pavlik
 *
 *  Based on the work of:
 *  Michael Rausch      James Banks
 *  Matther Dillon      David Giller
 *  Nathan Laredo       Linus Torvalds
 *  Johan Myreen        Jes Sorensen
 *  Russell King
 */

/*
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published by
 * the Free Software Foundation
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>

#include <asm/irq.h>
#include <asm/setup.h>
#include <asm/uaccess.h>
#include <asm/amigahw.h>
#include <asm/amigaints.h>

MODULE_AUTHOR("Vojtech Pavlik <[email protected]>");
MODULE_DESCRIPTION("Amiga mouse driver");
MODULE_LICENSE("GPL");

static int amimouse_lastx, amimouse_lasty;

static irqreturn_t amimouse_interrupt(int irq, void *data)
{
    struct input_dev *dev = data;
    unsigned short joy0dat, potgor;
    int nx, ny, dx, dy;

    joy0dat = amiga_custom.joy0dat;

    nx = joy0dat & 0xff;
    ny = joy0dat >> 8;

    dx = nx - amimouse_lastx;
    dy = ny - amimouse_lasty;

    if (dx < -127) dx = (256 + nx) - amimouse_lastx;
    if (dx >  127) dx = (nx - 256) - amimouse_lastx;
    if (dy < -127) dy = (256 + ny) - amimouse_lasty;
    if (dy >  127) dy = (ny - 256) - amimouse_lasty;

    amimouse_lastx = nx;
    amimouse_lasty = ny;

    potgor = amiga_custom.potgor;

    input_report_rel(dev, REL_X, dx);
    input_report_rel(dev, REL_Y, dy);

    input_report_key(dev, BTN_LEFT,   ciaa.pra & 0x40);
    input_report_key(dev, BTN_MIDDLE, potgor & 0x0100);
    input_report_key(dev, BTN_RIGHT,  potgor & 0x0400);

    input_sync(dev);

    return IRQ_HANDLED;
}

static int amimouse_open(struct input_dev *dev)
{
    unsigned short joy0dat;
    int error;

    joy0dat = amiga_custom.joy0dat;

    amimouse_lastx = joy0dat & 0xff;
    amimouse_lasty = joy0dat >> 8;

    error = request_irq(IRQ_AMIGA_VERTB, amimouse_interrupt, 0, "amimouse",
                dev);
    if (error)
        dev_err(&dev->dev, "Can't allocate irq %d\n", IRQ_AMIGA_VERTB);

    return error;
}

static void amimouse_close(struct input_dev *dev)
{
    free_irq(IRQ_AMIGA_VERTB, dev);
}

static int __init amimouse_probe(struct platform_device *pdev)
{
    int err;
    struct input_dev *dev;

    dev = input_allocate_device();
    if (!dev)
        return -ENOMEM;

    dev->name = pdev->name;
    dev->phys = "amimouse/input0";
    dev->id.bustype = BUS_AMIGA;
    dev->id.vendor = 0x0001;
    dev->id.product = 0x0002;
    dev->id.version = 0x0100;

    dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REL);
    dev->relbit[0] = BIT_MASK(REL_X) | BIT_MASK(REL_Y);
    dev->keybit[BIT_WORD(BTN_LEFT)] = BIT_MASK(BTN_LEFT) |
        BIT_MASK(BTN_MIDDLE) | BIT_MASK(BTN_RIGHT);
    dev->open = amimouse_open;
    dev->close = amimouse_close;
    dev->dev.parent = &pdev->dev;

    err = input_register_device(dev);
    if (err) {
        input_free_device(dev);
        return err;
    }

    platform_set_drvdata(pdev, dev);

    return 0;
}

static int __exit amimouse_remove(struct platform_device *pdev)
{
    struct input_dev *dev = platform_get_drvdata(pdev);

    platform_set_drvdata(pdev, NULL);
    input_unregister_device(dev);
    return 0;
}

static struct platform_driver amimouse_driver = {
    .remove = __exit_p(amimouse_remove),
    .driver   = {
        .name   = "amiga-mouse",
        .owner  = THIS_MODULE,
    },
};

static int __init amimouse_init(void)
{
    return platform_driver_probe(&amimouse_driver, amimouse_probe);
}

module_init(amimouse_init);

static void __exit amimouse_exit(void)
{
    platform_driver_unregister(&amimouse_driver);
}

module_exit(amimouse_exit);

MODULE_ALIAS("platform:amiga-mouse");