/*** $Id: mou_ps2.c,v 1.16 2003/09/26 08:45:14 snig Exp $**** mou_ps2.c: PS/2 mouse driver.**** Copyright (C) 2003 Feynman Software.** Copyright (C) 2000 ~ 2002 Song Lixin and Wei Yongming.**** Created by Song Lixin at 2000/11/17 *//*** 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 _PS2_SUPPORT#define SCALE           3    /* default scaling factor for acceleration */#define THRESH          5    /* default threshhold for acceleration */#define PS2_SCALE11     230    /* Set 1:1 scale factor */#define PS2_SCALE21     231    /* Set 2:1 scale factor */#define PS2_SETRES      232    /* Set resolution */#define PS2_GETSCALE    233    /* Get scale factor */#define PS2_SETSTREAM   234    /* Set stream mode */#define PS2_SETSAMPLE   243    /* Set sample rate */#define PS2_ENABLE      244    /* Enable PS/2 device */#define PS2_DISABLE     245    /* Disable PS/2 device */#define PS2_DEFAULT     246    /* Set default settings */#define PS2_RESET       255    /* Reset PS/2 device */static gal_uint8 initdata_ps2[] = /* Make sure the mouse is enabled and in a sane state */{ PS2_DEFAULT, PS2_SCALE11, PS2_ENABLE };static int  PS2_Open(const char* mdev);static void PS2_Close(void);static int  PS2_GetButtonInfo(void);static void PS2_GetDefaultAccel(int *pscale,int *pthresh);static int  PS2_Read(int *dx, int *dy, int *dz, int *bp);static void PS2_Suspend(void);static int  PS2_Resume(void);MOUSEDEVICE mousedev_PS2 = {    PS2_Open,    PS2_Close,    PS2_GetButtonInfo,    PS2_GetDefaultAccel,    PS2_Read,    PS2_Suspend,    PS2_Resume};static int mouse_fd;/* * Open up the mouse device. * Returns the fd if successful, or negative if unsuccessful. */static int PS2_Open(const char* mdev){    mouse_fd = open (mdev, O_RDWR);    if (mouse_fd < 0) {        /* try to open read only again. */        mouse_fd = open (mdev, O_RDONLY);        if (mouse_fd < 0)            return -1;    }    else {        write (mouse_fd, initdata_ps2, sizeof(initdata_ps2));    }    return mouse_fd;}/* * Close the mouse device. */static void PS2_Close(void){    if (mouse_fd > 0)        close(mouse_fd);    mouse_fd = -1;}/* * Get mouse buttons supported */static int PS2_GetButtonInfo(void){    return BUTTON_L | BUTTON_M | BUTTON_R;}/* * Get default mouse acceleration settings */static void PS2_GetDefaultAccel(int *pscale,int *pthresh){    *pscale = SCALE;    *pthresh = THRESH;}/* * Attempt to read bytes from the mouse and interpret them. * Returns -1 on error, 0 if either no bytes were read or not enough * was read for a complete state, or 1 if the new state was read. * When a new state is read, the current buttons and x and y deltas * are returned.  This routine does not block. */static int PS2_Read(int *dx, int *dy, int *dz, int *bp){    static unsigned char buf[3];    static int buttons[4] = { 0, 4, 1, 5};    static int nbytes;    int n;    while((n = read (mouse_fd, &buf[nbytes], 3 - nbytes))) {        if(n < 0) {            if (errno == EINTR)                continue;            else                return -1;        }        nbytes += n;        if(nbytes == 3) {            /* Check header byte. */            if ((buf[0] & 0xc0) != 0) {                buf[0] = buf[1];                buf[1] = buf[2];                nbytes = 2;                return -1;            }            *bp = buttons[(buf[0] & 0x03)];            *dx = (buf[0] & 0x10) ? buf[1] - 256 : buf[1];            *dy = (buf[0] & 0x20) ? -(buf[2] - 256) : -buf[2];            *dz = 0;            nbytes = 0;            return 1;        }    }    return 0;}static void PS2_Suspend(void){    PS2_Close();}static int PS2_Resume(void){    return PS2_Open(IAL_MDev);}#endif /* PS2_SUPPORT */