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/*

 * Amiga Mouse Driver for Linux 68k by Michael Rausch

 * based upon:

 *

 * Logitech Bus Mouse Driver for Linux

 * by James Banks

 *

 * Mods by Matthew Dillon

 *   calls verify_area()

 *   tracks better when X is busy or paging

 *

 * Heavily modified by David Giller

 *   changed from queue- to counter- driven

 *   hacked out a (probably incorrect) mouse_poll

 *

 * Modified again by Nathan Laredo to interface with

 *   0.96c-pl1 IRQ handling changes (13JUL92)

 *   didn't bother touching poll code.

 *

 * Modified the poll() code blindly to conform to the VFS

 *   requirements. 92.07.14 - Linus. Somebody should test it out.

 *

 * Modified by Johan Myreen to make room for other mice (9AUG92)

 *   removed assignment chr_fops[10] = &mouse_fops; see mouse.c

 *   renamed mouse_fops => bus_mouse_fops, made bus_mouse_fops public.

 *   renamed this file mouse.c => busmouse.c

 *

 * Modified for use in the 1.3 kernels by Jes Sorensen.

 *

 * Moved the isr-allocation to the mouse_{open,close} calls, as there

 *   is no reason to service the mouse in the vertical blank isr if

 *   the mouse is not in use.             Jes Sorensen

 *

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

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

 */

#include <linux/module.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/mm.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 <linux/ioport.h>

#include <linux/logibusmouse.h>

#include <asm/setup.h>

#include <asm/system.h>

#include <asm/uaccess.h>

#include <asm/irq.h>

#include <asm/amigahw.h>

#include <asm/amigaints.h>

#include "busmouse.h"

#if AMIGA_OLD_INT

#define AMI_MSE_INT_ON()        mouseint_allowed = 1

#define AMI_MSE_INT_OFF()       mouseint_allowed = 0

static int mouseint_allowed;

#endif

static int msedev;

static void mouse_interrupt(int irq, void *dummy, struct pt_regs *fp)

{

        static int lastx=0, lasty=0;

        int dx, dy;

        int nx, ny;

        unsigned char buttons;

        unsigned short joy0dat, potgor;

#if AMIGA_OLD_INT

        if(!mouseint_allowed)

                return;

        AMI_MSE_INT_OFF();

#endif

        /*

         *  This routine assumes, just like Kickstart, that the mouse

         *  has not moved more than 127 ticks since last VBL.

         */

        joy0dat = custom.joy0dat;

        nx = joy0dat & 0xff;

        ny = joy0dat >> 8;

        dx = nx - lastx;

        if (dx < - 127)

                dx = (256 + nx) - lastx;

        if (dx > 127)

                dx = (nx - 256) - lastx;

        dy = ny - lasty;

        if (dy < - 127)

                dy = (256 + ny) - lasty;

        if (dy > 127)

                dy = (ny - 256) - lasty;

        lastx = nx;

        lasty = ny;

#if 0

        dx = -lastdx;

        dx += (lastdx = joy0dat & 0xff);

        if (dx < -127)

            dx = -255-dx;               /* underrun */

        else

        if (dx > 127)

            dx = 255-dx;                /* overflow */

        dy = -lastdy;

        dy += (lastdy = joy0dat >> 8);

        if (dy < -127)

            dy = -255-dy;

        else

        if (dy > 127)

            dy = 255-dy;

#endif

        potgor = custom.potgor;

        buttons = (ciaa.pra & 0x40 ? 4 : 0) |    /* left button; note that the bits are low-active, as are the expected results -> double negation */

#if 1

                  (potgor & 0x0100 ? 2 : 0) |    /* middle button; emulation goes here */

#endif

                  (potgor & 0x0400 ? 1 : 0);     /* right button */

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

#if AMIGA_OLD_INT

        AMI_MSE_INT_ON();

#endif

}

/*

 * close access to the mouse

 */

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

{

        free_irq(IRQ_AMIGA_VERTB, mouse_interrupt);

#if AMIGA_OLD_INT

        AMI_MSE_INT_OFF();

#endif

        return 0;

}

/*

 * open access to the mouse, currently only one open is

 * allowed.

 */

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

{

        /*

         *  use VBL to poll mouse deltas

         */

        if(request_irq(IRQ_AMIGA_VERTB, mouse_interrupt, 0,

                       "Amiga mouse", mouse_interrupt)) {

                printk(KERN_INFO "Installing Amiga mouse failed.\n");

                return -EIO;

        }

#if AMIGA_OLD_INT

        AMI_MSE_INT_ON();

#endif

        return 0;

}

static struct busmouse amigamouse = {

        AMIGAMOUSE_MINOR, "amigamouse", THIS_MODULE, open_mouse, release_mouse, 7

};

static int __init amiga_mouse_init(void)

{

        if (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(AMI_MOUSE))

                return -ENODEV;

        if (!request_mem_region(CUSTOM_PHYSADDR+10, 2, "amigamouse [Denise]"))

                return -EBUSY;

        custom.joytest = 0;      /* reset counters */

#if AMIGA_OLD_INT

        AMI_MSE_INT_OFF();

#endif

        msedev = register_busmouse(&amigamouse);

        if (msedev < 0)

                printk(KERN_WARNING "Unable to install Amiga mouse driver.\n");

        else

                printk(KERN_INFO "Amiga mouse installed.\n");

        return msedev < 0 ? msedev : 0;

}

static void __exit amiga_mouse_exit(void)

{

        unregister_busmouse(msedev);

        release_mem_region(CUSTOM_PHYSADDR+10, 2);

}

module_init(amiga_mouse_init);

module_exit(amiga_mouse_exit);

MODULE_LICENSE("GPL");