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/*

 * ATI XL Bus Mouse Driver for Linux

 * by Bob Harris (rth@sparta.com)

 *

 * Uses VFS interface for linux 0.98 (01OCT92)

 *

 * Modified by Chris Colohan (colohan@eecg.toronto.edu)

 * 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 0.3a

 */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/sched.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 <asm/io.h>

#include <asm/uaccess.h>

#include <asm/system.h>

#include <asm/irq.h>

#include "busmouse.h"

#define ATIXL_MOUSE_IRQ         5 /* H/W interrupt # set up on ATIXL board */

#define ATIXL_BUSMOUSE          3 /* Minor device # (mknod c 10 3 /dev/bm) */

/* ATI XL Inport Busmouse Definitions */

#define ATIXL_MSE_DATA_PORT             0x23d

#define ATIXL_MSE_SIGNATURE_PORT        0x23e

#define ATIXL_MSE_CONTROL_PORT          0x23c

#define ATIXL_MSE_READ_BUTTONS          0x00

#define ATIXL_MSE_READ_X                0x01

#define ATIXL_MSE_READ_Y                0x02

/* Some nice ATI XL macros */

/* Select IR7, HOLD UPDATES (INT ENABLED), save X,Y */

#define ATIXL_MSE_DISABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \

        outb( (0x20 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }

/* Select IR7, Enable updates (INT ENABLED) */

#define ATIXL_MSE_ENABLE_UPDATE() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \

         outb( (0xdf & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }

/* Select IR7 - Mode Register, NO INTERRUPTS */

#define ATIXL_MSE_INT_OFF() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \

        outb( (0xe7 & inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }

/* Select IR7 - Mode Register, DATA INTERRUPTS ENABLED */

#define ATIXL_MSE_INT_ON() { outb( 0x07, ATIXL_MSE_CONTROL_PORT ); \

        outb( (0x08 | inb( ATIXL_MSE_DATA_PORT )), ATIXL_MSE_DATA_PORT ); }

/* Same general mouse structure */

static int msedev;

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

{

        char dx, dy, buttons;

        ATIXL_MSE_DISABLE_UPDATE(); /* Note that interrupts are still enabled */

        outb(ATIXL_MSE_READ_X, ATIXL_MSE_CONTROL_PORT); /* Select IR1 - X movement */

        dx = inb( ATIXL_MSE_DATA_PORT);

        outb(ATIXL_MSE_READ_Y, ATIXL_MSE_CONTROL_PORT); /* Select IR2 - Y movement */

        dy = inb( ATIXL_MSE_DATA_PORT);

        outb(ATIXL_MSE_READ_BUTTONS, ATIXL_MSE_CONTROL_PORT); /* Select IR0 - Button Status */

        buttons = inb( ATIXL_MSE_DATA_PORT);

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

        ATIXL_MSE_ENABLE_UPDATE();

}

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

{

        ATIXL_MSE_INT_OFF(); /* Interrupts are really shut down here */

        free_irq(ATIXL_MOUSE_IRQ, NULL);

        return 0;

}

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

{

        if (request_irq(ATIXL_MOUSE_IRQ, mouse_interrupt, 0, "ATIXL mouse", NULL))

                return -EBUSY;

        ATIXL_MSE_INT_ON(); /* Interrupts are really enabled here */

        return 0;

}

static struct busmouse atixlmouse = {

        ATIXL_BUSMOUSE, "atixl", THIS_MODULE, open_mouse, release_mouse, 0

};

static int __init atixl_busmouse_init(void)

{

        unsigned char a,b,c;

        /*

         *      We must request the resource and claim it atomically

         *      nowdays. We can throw it away on error. Otherwise we

         *      may race another module load of the same I/O

         */

        if (!request_region(ATIXL_MSE_DATA_PORT, 3, "atixlmouse"))

                return -EIO;

        a = inb( ATIXL_MSE_SIGNATURE_PORT );    /* Get signature */

        b = inb( ATIXL_MSE_SIGNATURE_PORT );

        c = inb( ATIXL_MSE_SIGNATURE_PORT );

        if (( a != b ) && ( a == c ))

                printk(KERN_INFO "\nATI Inport ");

        else

        {

                release_region(ATIXL_MSE_DATA_PORT,3);

                return -EIO;

        }

        outb(0x80, ATIXL_MSE_CONTROL_PORT);     /* Reset the Inport device */

        outb(0x07, ATIXL_MSE_CONTROL_PORT);     /* Select Internal Register 7 */

        outb(0x0a, ATIXL_MSE_DATA_PORT);        /* Data Interrupts 8+, 1=30hz, 2=50hz, 3=100hz, 4=200hz rate */

        msedev = register_busmouse(&atixlmouse);

        if (msedev < 0)

        {

                printk("Bus mouse initialisation error.\n");

                release_region(ATIXL_MSE_DATA_PORT,3);  /* Was missing */

        }

        else

                printk("Bus mouse detected and installed.\n");

        return msedev < 0 ? msedev : 0;

}

static void __exit atixl_cleanup (void)

{

        release_region(ATIXL_MSE_DATA_PORT, 3);

        unregister_busmouse(msedev);

}

module_init(atixl_busmouse_init);

module_exit(atixl_cleanup);

MODULE_LICENSE("GPL");