/*** $Id: mou_ms.c,v 1.5 2003/09/26 08:45:14 snig Exp $**** mou_ms.c: MS Mouse Driver**** Copyright (C) 2003 Feynman Software.*//*** 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 _MS_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  MS_Open (const char* mdev);static void MS_Close (void);static int  MS_GetButtonInfo (void);static void MS_GetDefaultAccel (int *pscale, int *pthresh);static int  MS_Read (int *dx, int *dy, int *dz, int *bp);static void MS_Suspend (void);static int  MS_Resume (void);MOUSEDEVICE mousedev_MS = {    MS_Open,    MS_Close,    MS_GetButtonInfo,    MS_GetDefaultAccel,    MS_Read,    MS_Suspend,    MS_Resume};static int mouse_fd;/* * Open up the mouse device. * Returns the fd if successful, or negative if unsuccessful. */static int MS_Open (const char* mdev){    mouse_fd = open (mdev, O_RDONLY);    if (mouse_fd < 0)        return -1;    return mouse_fd;}/* * Close the mouse device. */static void MS_Close (void){    if (mouse_fd > 0)        close (mouse_fd);    mouse_fd = -1;}/* * Get mouse buttons supported */static int MS_GetButtonInfo (void){    return BUTTON_L | BUTTON_M | BUTTON_R;}/* * Get default mouse acceleration settings */static void MS_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 MS_Read(int *dx, int *dy, int *dz, int *bp){   static unsigned char buf[3];   static int nbytes;   int n;   int buttons[4] = { 0, 1, 4, 5};   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 */           if ((buf[0] & 0x40) != 0x40) {               memmove(buf, buf + 1, 2);               nbytes = 2;               return -1;           }           *bp = buttons[((buf[0] >> 4) & 0x03)];           *dx = (signed char)((buf[0] << 6) | (buf[1] & 0x3f));           *dy = (signed char)(((buf[0] << 4) & 0xc0) | (buf[2] & 0x3f));           *dz = 0;           nbytes = 0;           return 1;       }   }   return 0;}static void MS_Suspend (void){    MS_Close();}static int MS_Resume(void){    return MS_Open (IAL_MDev);}#endif /* _MS_SUPPORT */