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/*

 * Microsoft busmouse driver based on Logitech driver (see busmouse.c)

 *

 * Microsoft BusMouse support by Teemu Rantanen (tvr@cs.hut.fi) (02AUG92)

 *

 * Microsoft Bus Mouse support modified by Derrick Cole (cole@concert.net)

 *    8/28/92

 *

 * Microsoft Bus Mouse support folded into 0.97pl4 code

 *    by Peter Cervasio (pete%q106fm.uucp@wupost.wustl.edu) (08SEP92)

 * Changes:  Logitech and Microsoft support in the same kernel.

 *           Defined new constants in busmouse.h for MS mice.

 *           Added int mse_busmouse_type to distinguish busmouse types

 *           Added a couple of new functions to handle differences in using

 *             MS vs. Logitech (where the int variable wasn't appropriate).

 *

 * Modified by Peter Cervasio (address above) (26SEP92)

 * Changes:  Included code to (properly?) detect when a Microsoft mouse is

 *           really attached to the machine.  Don't know what this does to

 *           Logitech bus mice, but all it does is read ports.

 *

 * Modified by Christoph Niemann (niemann@rubdv15.etdv.ruhr-uni-bochum.de)

 * Changes:  Better interrupt-handler (like in busmouse.c).

 *           Some changes to reduce code-size.

 *           Changed detection code to use inb_p() instead of doing empty

 *           loops to delay i/o.

 *

 * Modularised 8-Sep-95 Philip Blundell <pjb27@cam.ac.uk>

 *

 * Converted to use new generic busmouse code.  5 Apr 1998

 *   Russell King <rmk@arm.uk.linux.org>

 *

 * version 0.3b

 */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/ioport.h>

#include <linux/sched.h>

#include <linux/logibusmouse.h>

#include <linux/signal.h>

#include <linux/errno.h>

#include <linux/miscdevice.h>

#include <linux/random.h>

#include <linux/poll.h>

#include <linux/init.h>

#include <asm/io.h>

#include <asm/uaccess.h>

#include <asm/system.h>

#include <asm/irq.h>

#include "busmouse.h"

static int msedev;

static int mouse_irq = MOUSE_IRQ;

MODULE_PARM(mouse_irq, "i");

#ifndef MODULE

static int __init msmouse_setup(char *str)

{

        int ints[4];

        str = get_options(str, ARRAY_SIZE(ints), ints);

        if (ints[0] > 0)

                mouse_irq=ints[1];

        return 1;

}

__setup("msmouse=",msmouse_setup);

#endif /* !MODULE */

static void ms_mouse_interrupt(int irq, void *dev_id, struct pt_regs * regs)

{

        char dx, dy;

        unsigned char buttons;

        outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);

        outb((inb(MS_MSE_DATA_PORT) | 0x20), MS_MSE_DATA_PORT);

        outb(MS_MSE_READ_X, MS_MSE_CONTROL_PORT);

        dx = inb(MS_MSE_DATA_PORT);

        outb(MS_MSE_READ_Y, MS_MSE_CONTROL_PORT);

        dy = inb(MS_MSE_DATA_PORT);

        outb(MS_MSE_READ_BUTTONS, MS_MSE_CONTROL_PORT);

        buttons = ~(inb(MS_MSE_DATA_PORT)) & 0x07;

        outb(MS_MSE_COMMAND_MODE, MS_MSE_CONTROL_PORT);

        outb((inb(MS_MSE_DATA_PORT) & 0xdf), MS_MSE_DATA_PORT);

        /* why did the original have:

         * if (dx != 0 || dy != 0 || buttons != mouse.buttons ||

         *    ((~buttons) & 0x07))

         *    ^^^^^^^^^^^^^^^^^^^ this?

         */

        busmouse_add_movementbuttons(msedev, dx, -dy, buttons);

}

static int release_mouse(struct inode * inode, struct file * file)

{

        MS_MSE_INT_OFF();

        free_irq(mouse_irq, NULL);

        return 0;

}

static int open_mouse(struct inode * inode, struct file * file)

{

        if (request_irq(mouse_irq, ms_mouse_interrupt, 0, "MS Busmouse", NULL))

                return -EBUSY;

        outb(MS_MSE_START, MS_MSE_CONTROL_PORT);

        MS_MSE_INT_ON();

        return 0;

}

static struct busmouse msbusmouse = {

        MICROSOFT_BUSMOUSE, "msbusmouse", THIS_MODULE, open_mouse, release_mouse, 0

};

static int __init ms_bus_mouse_init(void)

{

        int present = 0;

        int mse_byte, i;

        if (check_region(MS_MSE_CONTROL_PORT, 0x04))

                return -ENODEV;

        if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {

                mse_byte = inb_p(MS_MSE_SIGNATURE_PORT);

                for (i = 0; i < 4; i++) {

                        if (inb_p(MS_MSE_SIGNATURE_PORT) == 0xde) {

                                if (inb_p(MS_MSE_SIGNATURE_PORT) == mse_byte)

                                        present = 1;

                                else

                                        present = 0;

                        } else

                                present = 0;

                }

        }

        if (present == 0)

                return -EIO;

        if (!request_region(MS_MSE_CONTROL_PORT, 0x04, "MS Busmouse"))

                return -EIO;

        MS_MSE_INT_OFF();

        msedev = register_busmouse(&msbusmouse);

        if (msedev < 0) {

                printk(KERN_WARNING "Unable to register msbusmouse driver.\n");

                release_region(MS_MSE_CONTROL_PORT, 0x04);

        }

        else

                printk(KERN_INFO "Microsoft BusMouse detected and installed.\n");

        return msedev < 0 ? msedev : 0;

}

static void __exit ms_bus_mouse_exit(void)

{

        unregister_busmouse(msedev);

        release_region(MS_MSE_CONTROL_PORT, 0x04);

}

module_init(ms_bus_mouse_init)

module_exit(ms_bus_mouse_exit)

MODULE_LICENSE("GPL");

EXPORT_NO_SYMBOLS;