/*** $Id: mou_ms3.c,v 1.6 2004/07/18 09:23:48 linxs Exp $**** mou_ms3.c: MS3 Mouse Driver**** Copyright (C) 2003 Feynman Software.** Copyright (C) 2001 ~ 2002 Eric Hu and Wei Yongming.*//*** 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*/#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 _MS3_SUPPORT#define SCALE       3    /* default scaling factor for acceleration */#define THRESH      5    /* default threshhold for acceleration */#define PLEN		4    /* mouse data package length */static int  MS3_Open (const char* mdev);static void MS3_Close (void);static int  MS3_GetButtonInfo (void);static void MS3_GetDefaultAccel (int *pscale, int *pthresh);static int  MS3_Read (int *dx, int *dy, int *dz, int *bp);static void MS3_Suspend (void);static int  MS3_Resume (void);MOUSEDEVICE mousedev_MS3 = {    MS3_Open,    MS3_Close,    MS3_GetButtonInfo,    MS3_GetDefaultAccel,    MS3_Read,    MS3_Suspend,    MS3_Resume};static int mouse_fd;/* * Open up the mouse device. * Returns the fd if successful, or negative if unsuccessful. */static int MS3_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 MS3_Close (void){    if (mouse_fd > 0)        close (mouse_fd);    mouse_fd = -1;}/* * Get mouse buttons supported */static int MS3_GetButtonInfo (void){    return BUTTON_L | BUTTON_M | BUTTON_R;}/* * Get default mouse acceleration settings */static void MS3_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 MS3_Read(int *dx, int *dy, int *dz, int *bp){    static unsigned char buf[PLEN];    static int nbytes;    int n;    int buttons[4] = { 0, 1, 4, 5};    while((n = read(mouse_fd, &buf[nbytes], PLEN - nbytes))) {        if(n < 0) {            if (errno == EINTR)                continue;            else                return -1;        }        nbytes += n;        if(nbytes == PLEN) {            /* check header */            if ((buf[0] & 0x40) != 0x40) {                memmove(buf, buf + 1, PLEN-1);                nbytes = PLEN-1;                return -1;            }            *bp = buttons[((buf[0] >> 4) & 0x03)];            if (buf[3] & 0x10)                *bp |= 0x2;            *dx = (signed char)((buf[0] << 6) | (buf[1] & 0x3f));            *dy = (signed char)(((buf[0] << 4) & 0xc0) | (buf[2] & 0x3f));            if (buf[3] & 0x8)                *dz = (signed char)(buf[3] | 0xf0);            else                *dz = buf[3] & 0x7;            nbytes = 0;            return 1;        }    }    return 0;}static void MS3_Suspend(void){    MS3_Close();}static int MS3_Resume(void){    return MS3_Open(IAL_MDev);}#endif /* _MS3_SUPPORT */