/*** $Id: mou_imps2.c,v 1.4 2003/09/26 08:45:14 snig Exp $**** mou_imps2.c: Intelligent PS/2 Mouse Driver**** Copyright (C) 2002, 2003 Feynman Software.**** Create Date: 2002/10/15 *//*** This program is free software; you can redistribute it and/or modify** it under the terms of the GNU General Public License as published by** the Free Software Foundation; either version 2 of the License, or** (at your option) any later version.**** This program is distributed in the hope that it will be useful,** but WITHOUT ANY WARRANTY; without even the implied warranty of** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the** GNU General Public License for more details.**** You should have received a copy of the GNU General Public License** along with this program; if not, write to the Free Software** Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA*//*** TODO:*/#include <stdio.h>#include <string.h>#include <errno.h>#include <unistd.h>#include <fcntl.h>#include "common.h"#include "ial.h"#include "gal.h"#include "native.h"#ifdef _IMPS2_SUPPORT#define SCALE           3       /* default scaling factor for acceleration */#define THRESH          5       /* default threshhold for acceleration *//* The intialization string of imps/2 mouse, comes from * xc/program/Xserver/hw/xfree86/input/mouse/mouse.c */static unsigned char IMPS2_Param [] = {243,200,243,100,243,80};static int  IMPS2_Open (const char* mdev);static void IMPS2_Close (void);static int  IMPS2_GetButtonInfo (void);static void IMPS2_GetDefaultAccel (int *pscale, int *pthresh);static int  IMPS2_Read (int *dx, int *dy, int *dz, int *bp);static void IMPS2_Suspend (void);static int IMPS2_Resume (void);MOUSEDEVICE mousedev_IMPS2 = {    IMPS2_Open,    IMPS2_Close,    IMPS2_GetButtonInfo,    IMPS2_GetDefaultAccel,    IMPS2_Read,    IMPS2_Suspend,    IMPS2_Resume};static int mouse_fd;static int IMPS2_Open (const char* mdev){    mouse_fd = open (mdev, O_RDWR);    if (mouse_fd < 0) {        mouse_fd = open (mdev, O_RDONLY);        if (mouse_fd < 0)            return -1;    }    else {        write (mouse_fd, IMPS2_Param, sizeof (IMPS2_Param));    }    return mouse_fd;}static void IMPS2_Close (void){    if (mouse_fd > 0)        close (mouse_fd);    mouse_fd = -1;}static int IMPS2_GetButtonInfo(void){    return BUTTON_L | BUTTON_M | BUTTON_R | WHEEL_UP | WHEEL_DOWN;}static void IMPS2_GetDefaultAccel(int *pscale, int *pthresh){    *pscale = SCALE;    *pthresh = THRESH;}static int IMPS2_Read (int *dx, int *dy, int *dz, int *bp){    static unsigned char buf[5];    static int buttons[4] = { 0, 4, 1, 5};    static int nbytes;    int n;    while ((n = read (mouse_fd, &buf [nbytes], 4 - nbytes))) {        if (n < 0) {            if (errno == EINTR)                continue;            else                return -1;        }        nbytes += n;        if (nbytes == 4) {            int wheel;            if ((buf[0] & 0xc0) != 0) {                buf[0] = buf[1];                buf[1] = buf[2];                buf[2] = buf[3];                nbytes = 3;                return -1;            }            /* FORM XFree86 4.0.1 */            *bp = buttons[(buf[0] & 0x03)];            *dx = (buf[0] & 0x10) ? buf[1] - 256 : buf[1];            *dy = (buf[0] & 0x20) ? -(buf[2] - 256) : -buf[2];            /* Is a wheel event? */            if ((wheel = buf[3]) != 0) {                if(wheel > 0x7f) {                    *bp = WHEEL_UP;                }                else {                    *bp = WHEEL_DOWN;                }            }                         *dz = 0;            nbytes = 0;            return 1;        }    }    return 0;}static void IMPS2_Suspend (void){    IMPS2_Close();}static int IMPS2_Resume (void){    return IMPS2_Open (IAL_MDev);}#endif /* _IMPS2_SUPPORT */