mou_ms3.c

mini gui 1.6.8 lib and source

/*
** $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 */