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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>

 *

 * version 0.3b

 */

#include <linux/module.h>

#include <linux/kernel.h>

#include <linux/ioport.h>

#include <linux/sched.h>

#include <linux/busmouse.h>

#include <linux/signal.h>

#include <linux/errno.h>

#include <linux/miscdevice.h>

#include <linux/random.h>

#include <asm/io.h>

#include <asm/segment.h>

#include <asm/system.h>

#include <asm/irq.h>

static struct mouse_status mouse;

static int mouse_irq = MOUSE_IRQ;

void msmouse_setup(char *str, int *ints)

{

        if (ints[0] > 0)

                mouse_irq=ints[1];

}

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);

        if (dx != 0 || dy != 0 || buttons != mouse.buttons || ((~buttons) & 0x07)) {

                add_mouse_randomness((buttons << 16) + (dy << 8) + dx);

                mouse.buttons = buttons;

                mouse.dx += dx;

                mouse.dy += dy;

                mouse.ready = 1;

                wake_up_interruptible(&mouse.wait);

                if (mouse.fasyncptr)

                        kill_fasync(mouse.fasyncptr, SIGIO);

        }

}

static int fasync_mouse(struct inode *inode, struct file *filp, int on)

{

        int retval;

        retval = fasync_helper(inode, filp, on, &mouse.fasyncptr);

        if (retval < 0)

                return retval;

        return 0;

}

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

{

        fasync_mouse(inode, file, 0);

        if (--mouse.active)

                return;

        MS_MSE_INT_OFF();

        mouse.ready = 0;

        free_irq(mouse_irq, NULL);

        MOD_DEC_USE_COUNT;

}

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

{

        if (!mouse.present)

                return -EINVAL;

        if (mouse.active++)

                return 0;

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

                mouse.active--;

                return -EBUSY;

        }

        mouse.ready = mouse.dx = mouse.dy = 0;

        mouse.buttons = 0x80;

        outb(MS_MSE_START, MS_MSE_CONTROL_PORT);

        MOD_INC_USE_COUNT;

        MS_MSE_INT_ON();

        return 0;

}

static int write_mouse(struct inode * inode, struct file * file, const char * buffer, int count)

{

        return -EINVAL;

}

static int read_mouse(struct inode * inode, struct file * file, char * buffer, int count)

{

        int i, dx, dy;

        if (count < 3)

                return -EINVAL;

        if (!mouse.ready)

                return -EAGAIN;

        put_user(mouse.buttons | 0x80, buffer);

        dx = mouse.dx < -127 ? -127 : mouse.dx > 127 ?  127 :  mouse.dx;

        dy = mouse.dy < -127 ?  127 : mouse.dy > 127 ? -127 : -mouse.dy;

        put_user((char)dx, buffer + 1);

        put_user((char)dy, buffer + 2);

        for (i = 3; i < count; i++)

                put_user(0x00, buffer + i);

        mouse.dx -= dx;

        mouse.dy += dy;

        mouse.ready = 0;

        return i;

}

static int mouse_select(struct inode *inode, struct file *file, int sel_type, select_table * wait)

{

        if (sel_type != SEL_IN)

                return 0;

        if (mouse.ready)

                return 1;

        select_wait(&mouse.wait,wait);

        return 0;

}

struct file_operations ms_bus_mouse_fops = {

        NULL,           /* mouse_seek */

        read_mouse,

        write_mouse,

        NULL,           /* mouse_readdir */

        mouse_select,   /* mouse_select */

        NULL,           /* mouse_ioctl */

        NULL,           /* mouse_mmap */

        open_mouse,

        release_mouse,

        NULL,

        fasync_mouse,

};

static struct miscdevice ms_bus_mouse = {

        MICROSOFT_BUSMOUSE, "msbusmouse", &ms_bus_mouse_fops

};

int ms_bus_mouse_init(void)

{

        int mse_byte, i;

        mouse.present = mouse.active = mouse.ready = 0;

        mouse.buttons = 0x80;

        mouse.dx = mouse.dy = 0;

        mouse.wait = NULL;

        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)

                                        mouse.present = 1;

                                else

                                        mouse.present = 0;

                        } else

                                mouse.present = 0;

                }

        }

        if (mouse.present == 0)

                return -EIO;

        MS_MSE_INT_OFF();

        request_region(MS_MSE_CONTROL_PORT, 0x04, "MS Busmouse");

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

        misc_register(&ms_bus_mouse);

        return 0;

}

#ifdef MODULE

int init_module(void)

{

        return ms_bus_mouse_init();

}

void cleanup_module(void)

{

        misc_deregister(&ms_bus_mouse);

        release_region(MS_MSE_CONTROL_PORT, 0x04);

}

#endif