/*** $Id: mou_gpm.c,v 1.11 2004/07/18 09:23:48 linxs Exp $**** Copyright (C) 2003 Feynman Software.** Copyright (C) 2000 ~ 2002 Song Lixin and Wei Yongming.**** mou_gpm.c: GPM Mouse Driver**** Create by Song Lixin at 2000/10/17.*//*** 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 <errno.h>#include <unistd.h>#include <fcntl.h>#include <string.h>#include "common.h"#include "ial.h"#include "gal.h"#include "native.h"#ifdef _GPM_SUPPORT#define SCALE           3    /* default scaling factor for acceleration */#define THRESH          5    /* default threshhold for acceleration */static int  GPM_Open(const char* mdev);static void GPM_Close(void);static int  GPM_GetButtonInfo(void);static void GPM_GetDefaultAccel(int *pscale,int *pthresh);static int  GPM_Read(int *dx, int *dy, int *dz, int *bp);static void GPM_Suspend(void);static int  GPM_Resume(void);MOUSEDEVICE mousedev_GPM = {    GPM_Open,    GPM_Close,    GPM_GetButtonInfo,    GPM_GetDefaultAccel,    GPM_Read,    GPM_Suspend,    GPM_Resume};static int mouse_fd;/* * Open up the mouse device. * Returns the fd if successful, or negative if unsuccessful. */static int GPM_Open (const char* mdev){    mouse_fd = open (mdev, O_RDONLY | O_NONBLOCK);    if (mouse_fd < 0)        return -1;    return mouse_fd;}/* * Close the mouse device. */static void GPM_Close(void){    if (mouse_fd > 0)        close(mouse_fd);    mouse_fd = -1;}/* * Get mouse buttons supported */static int GPM_GetButtonInfo(void){    return BUTTON_L | BUTTON_M | BUTTON_R;}/* * Get default mouse acceleration settings */static void GPM_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 GPM_Read(int *dx, int *dy, int *dz, int *bp){    static unsigned char buf[5];    static int nbytes;    int n;    while((n = read (mouse_fd, &buf[nbytes], 5 - nbytes))) {        if(n < 0) {            if (errno == EINTR)                continue;            else                return -1;        }        nbytes += n;        if(nbytes == 5) {            /* check header */            if ((buf[0] & 0xf8) != 0x80) {                memmove(buf, buf + 1, 4);                nbytes = 4;                return -1;            }            *bp = (~buf[0]) & 0x07;                        *dx = (signed char)(buf[1]) + (signed char)(buf[3]);            *dy = -((signed char)(buf[2]) + (signed char)(buf[4]));            *dz = 0;            nbytes = 0;            return 1;        }    }    return 0;}static void GPM_Suspend(void){    GPM_Close();}static int GPM_Resume(void){    return GPM_Open (IAL_MDev);}#endif /* _GPM_SUPPORT */