path: root/usr.sbin/wsmoused/mouse_protocols.c

/* $OpenBSD: mouse_protocols.c,v 1.1 2001/04/14 04:47:40 aaron Exp $ */

/*
 * Copyright (c) 2001 Jean-Baptiste Marchand, Julien Montagne and Jerome Verdon
 * 
 * Copyright (c) 1998 by Kazutaka Yokota
 *
 * Copyright (c) 1995 Michael Smith
 * 
 * Copyright (c) 1993 by David Dawes <dawes@xfree86.org>
 *
 * Copyright (c) 1990,91 by Thomas Roell, Dinkelscherben, Germany.
 *
 * All rights reserved.
 *
 * Most of this code was taken from the FreeBSD moused daemon, written by
 * Michael Smith. The FreeBSD moused daemon already contained code from the 
 * Xfree Project, written by David Dawes and Thomas Roell and Kazutaka Yokota.
 *
 * Adaptation to OpenBSD was done by Jean-Baptiste Marchand, Julien Montagne
 * and Jerome Verdon.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by
 *      David Dawes, Jean-Baptiste Marchand, Julien Montagne, Thomas Roell,
 *      Michael Smith, Jerome Verdon and Kazutaka Yokota.
 * 4. The name authors may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 */

/* Support for non-wsmouse (i.e. serial mice) mice */

/* 
 * Most of this code comes from the Xfree Project and are derived from two files
 * of Xfree86 3.3.6 with the following CVS tags :
 $XFree86: xc/programs/Xserver/hw/xfree86/common/xf86_Mouse.c,v 3.21.2.24 
 1999/12/11 19:00:42 hohndel Exp $ 
 and
 $XFree86: xc/programs/Xserver/hw/xfree86/common/xf86_PnPMouse.c,v 1.1.2.6 
 1999/07/29 09:22:51 hohndel Exp $ 
 */

#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/tty.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <setjmp.h>
#include <signal.h>
#include <poll.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include <varargs.h>

#include "wsmoused.h"
#include "mouse_protocols.h"

extern int debug;
extern int nodaemon;
extern int background; 
extern mouse_t mouse;

/*  Cflags of each mouse protocol, ordered by P_XXX */
static unsigned short mousecflags[] =
{
    (CS7	           | CREAD | CLOCAL | HUPCL ),	/* MicroSoft */
    (CS8 | CSTOPB	   | CREAD | CLOCAL | HUPCL ),	/* MouseSystems */
    (CS8 | CSTOPB	   | CREAD | CLOCAL | HUPCL ),	/* Logitech */
    (CS8 | PARENB | PARODD | CREAD | CLOCAL | HUPCL ),	/* MMSeries */
    (CS7		   | CREAD | CLOCAL | HUPCL ),	/* MouseMan */
    (CS8		   | CREAD | CLOCAL | HUPCL ),	/* MM HitTablet */
    (CS7	           | CREAD | CLOCAL | HUPCL ),	/* GlidePoint */
    (CS7                   | CREAD | CLOCAL | HUPCL ),	/* IntelliMouse */
    (CS7                   | CREAD | CLOCAL | HUPCL ),	/* Thinking Mouse */
};

/* array ordered by P_XXX giving protocol properties */
static unsigned char proto[][7] = {
    /*  hd_mask hd_id   dp_mask dp_id   bytes b4_mask b4_id */
    { 	0x40,	0x40,	0x40,	0x00,	3,   ~0x23,  0x00 }, /* MicroSoft */
    {	0xf8,	0x80,	0x00,	0x00,	5,    0x00,  0xff }, /* MouseSystems */
    {	0xe0,	0x80,	0x80,	0x00,	3,    0x00,  0xff }, /* Logitech */
    {	0xe0,	0x80,	0x80,	0x00,	3,    0x00,  0xff }, /* MMSeries */
    { 	0x40,	0x40,	0x40,	0x00,	3,   ~0x33,  0x00 }, /* MouseMan */
    {	0xe0,	0x80,	0x80,	0x00,	3,    0x00,  0xff }, /* MM HitTablet */
    { 	0x40,	0x40,	0x40,	0x00,	3,   ~0x33,  0x00 }, /* GlidePoint */
    { 	0x40,	0x40,	0x40,	0x00,	3,   ~0x3f,  0x00 }, /* IntelliMouse */
    { 	0x40,	0x40,	0x40,	0x00,	3,   ~0x33,  0x00 }, /* ThinkingMouse */
};

/* array ordered by P_XXX (mouse protocols) giving the protocol corresponding
   to the name of a mouse */
char *mouse_names[] = {
    "microsoft",
    "mousesystems",
    "logitech",
    "mmseries",
    "mouseman",
    "mmhitab",
    "glidepoint",
    "intellimouse",
    "thinkingmouse",
    NULL
};

/* protocol currently used */
static unsigned char cur_proto[7];

/* PnP EISA/product IDs */
static symtab_t pnpprod[] = {
    { "KML0001", P_THINKING},	/* Kensignton ThinkingMouse */
    { "MSH0001", P_IMSERIAL},	/* MS IntelliMouse */
    { "MSH0004", P_IMSERIAL},	/* MS IntelliMouse TrackBall */
    { "KYEEZ00", P_MS}, 	/* Genius EZScroll */
    { "KYE0001", P_MS}, 	/* Genius PnP Mouse */
    { "KYE0003", P_IMSERIAL},	/* Genius NetMouse */
    { "LGI800C", P_IMSERIAL}, 	/* Logitech MouseMan (4 button model) */
    { "LGI8050", P_IMSERIAL}, 	/* Logitech MouseMan+ */
    { "LGI8051", P_IMSERIAL}, 	/* Logitech FirstMouse+ */
    { "LGI8001", P_LOGIMAN},	/* Logitech serial */
    { "PNP0F01", P_MS},		/* MS serial */
    /*
     * XXX EzScroll returns PNP0F04 in the compatible device field; but it
     * doesn't look compatible... 
     */
    { "PNP0F04", P_MSC},	/* MouseSystems */ 
    { "PNP0F05", P_MSC},	/* MouseSystems */ 
    { "PNP0F08", P_LOGIMAN},	/* Logitech serial */
    { "PNP0F09", P_MS},		/* MS BallPoint serial */
    { "PNP0F0A", P_MS},		/* MS PnP serial */
    { "PNP0F0B", P_MS},		/* MS PnP BallPoint serial */
    { "PNP0F0C", P_MS},		/* MS serial comatible */
    { "PNP0F0F", P_MS},		/* MS BallPoint comatible */
    { "PNP0F17", P_LOGIMAN},	/* Logitech serial compat */
    { NULL, -1 },
};
	
static char *
gettokenname(symtab_t *tab, int val)
{
    int i;

    for (i = 0; tab[i].name != NULL; ++i) {
	if (tab[i].val == val)
	    return tab[i].name;
    }
    return NULL;
}

static symtab_t *
gettoken(symtab_t *tab, char *s, int len)
{
    int i;

    for (i = 0; tab[i].name != NULL; ++i) {
	if (strncmp(tab[i].name, s, len) == 0) 
		break;
    }
    return &tab[i];
}

char *
mouse_name(int type)
{
    return ((type == P_UNKNOWN) 
	|| (type > sizeof(mouse_names)/sizeof(mouse_names[0]) - 1))
	? "unknown" : mouse_names[type];
}

void SetMouseSpeed(int old, int new, unsigned int cflag)
{
	struct termios tty;
	char *c;

	if (!IS_SERIAL_DEV(mouse.portname))
		return;

	if (tcgetattr(mouse.mfd, &tty) < 0)
	{
		debug("Warning: %s unable to get status of mouse fd (%s)\n",
		       mouse.portname, strerror(errno));
		return;
	}

	/* this will query the initial baudrate only once */
	if (mouse.old_baudrate < 0) { 
	   switch (cfgetispeed(&tty)) 
	      {
	      case B9600: 
		 mouse.old_baudrate = 9600;
		 break;
	      case B4800: 
		 mouse.old_baudrate = 4800;
		 break;
	      case B2400: 
		 mouse.old_baudrate = 2400;
		 break;
	      case B1200: 
	      default:
		 mouse.old_baudrate = 1200;
		 break;
	      }
	}
	
	tty.c_iflag = IGNBRK | IGNPAR;
	tty.c_oflag = 0;
	tty.c_lflag = 0;
	tty.c_cflag = (tcflag_t)cflag;
	tty.c_cc[VTIME] = 0;
	tty.c_cc[VMIN] = 1;

	switch (old)
	{
	case 9600:
		cfsetispeed(&tty, B9600);
		cfsetospeed(&tty, B9600);
		break;
	case 4800:
		cfsetispeed(&tty, B4800);
		cfsetospeed(&tty, B4800);
		break;
	case 2400:
		cfsetispeed(&tty, B2400);
		cfsetospeed(&tty, B2400);
		break;
	case 1200:
	default:
		cfsetispeed(&tty, B1200);
		cfsetospeed(&tty, B1200);
	}

	if (tcsetattr(mouse.mfd, TCSADRAIN, &tty) < 0) {
		printf("Unable to get mouse status. Exiting...\n");
		exit(1);
	}
	
	switch (new)
	{
	case 9600:
		c = "*q";
		cfsetispeed(&tty, B9600);
		cfsetospeed(&tty, B9600);
		break;
	case 4800:
		c = "*p";
		cfsetispeed(&tty, B4800);
		cfsetospeed(&tty, B4800);
		break;
	case 2400:
		c = "*o";
		cfsetispeed(&tty, B2400);
		cfsetospeed(&tty, B2400);
		break;
	case 1200:
	default:
		c = "*n";
		cfsetispeed(&tty, B1200);
		cfsetospeed(&tty, B1200);
	}

	if (mouse.proto == P_LOGIMAN || mouse.proto == P_LOGI)
	{
		if (write(mouse.mfd, c, 2) != 2) {
			printf("Unable to write to mouse. Exiting...\n");
			exit(1);
		}
	}
	usleep(100000);

	if (tcsetattr(mouse.mfd, TCSADRAIN, &tty) < 0) {
		printf("Unable to get mouse status. Exiting...\n");
		exit(1);
	}
}

int
FlushInput(int fd)
{
	struct pollfd pfd[1];
	char c[4];

	if (tcflush(fd, TCIFLUSH) == 0)
		return 0;

	pfd[0].fd = fd;
	pfd[0].events = POLLIN;

	while (poll(pfd, 1, 0) > 0)
		read(fd, &c, sizeof(c));
	return 0;
}

/*
 * Try to elicit a PnP ID as described in 
 * Microsoft, Hayes: "Plug and Play External COM Device Specification, 
 * rev 1.00", 1995.
 *
 * The routine does not fully implement the COM Enumerator as par Section
 * 2.1 of the document.  In particular, we don't have idle state in which
 * the driver software monitors the com port for dynamic connection or 
 * removal of a device at the port, because `moused' simply quits if no 
 * device is found.
 *
 * In addition, as PnP COM device enumeration procedure slightly has 
 * changed since its first publication, devices which follow earlier
 * revisions of the above spec. may fail to respond if the rev 1.0 
 * procedure is used. XXX
 */

static int
pnpgets(int mouse_fd, char *buf)
{
    struct timeval timeout;
    struct pollfd pfd[1];
    int i;
    char c;

    pfd[0].fd = mouse_fd;
    pfd[0].events = POLLIN;

#if 0
    /* 
     * This is the procedure described in rev 1.0 of PnP COM device spec.
     * Unfortunately, some devices which comform to earlier revisions of
     * the spec gets confused and do not return the ID string...
     */

    /* port initialization (2.1.2) */
    ioctl(mouse_fd, TIOCMGET, &i);
    i |= TIOCM_DTR;		/* DTR = 1 */
    i &= ~TIOCM_RTS;		/* RTS = 0 */
    ioctl(mouse_fd, TIOCMSET, &i);
    usleep(200000);
    if ((ioctl(mouse_fd, TIOCMGET, &i) == -1) || ((i & TIOCM_DSR) == 0))
	goto disconnect_idle;

    /* port setup, 1st phase (2.1.3) */
    SetMouseSpeed(1200, 1200, (CS7 | CREAD | CLOCAL | HUPCL));
    i = TIOCM_DTR | TIOCM_RTS;	/* DTR = 0, RTS = 0 */
    ioctl(mouse_fd, TIOCMBIC, &i);
    usleep(200000);
    i = TIOCM_DTR;		/* DTR = 1, RTS = 0 */
    ioctl(mouse_fd, TIOCMBIS, &i);
    usleep(200000);

    /* wait for response, 1st phase (2.1.4) */
    FlushInput(mouse_fd);
    i = TIOCM_RTS;		/* DTR = 1, RTS = 1 */
    ioctl(mouse_fd, TIOCMBIS, &i);

    /* try to read something */
    if (poll(pfd, 1, 200000/1000) <= 0) {

	/* port setup, 2nd phase (2.1.5) */
        i = TIOCM_DTR | TIOCM_RTS;	/* DTR = 0, RTS = 0 */
        ioctl(mouse_fd, TIOCMBIC, &i);
        usleep(200000);

	/* wait for respose, 2nd phase (2.1.6) */
	FlushInput(mouse_fd);
        i = TIOCM_DTR | TIOCM_RTS;	/* DTR = 1, RTS = 1 */
        ioctl(mouse_fd, TIOCMBIS, &i);

        /* try to read something */
        if (poll(pfd, 1, 200000/1000) <= 0)
	    goto connect_idle;
    }
#else
    
    /*
     * This is a simplified procedure; it simply toggles RTS.
     */
    SetMouseSpeed(1200, 1200, (CS7 | CREAD | CLOCAL | HUPCL));

    ioctl(mouse_fd, TIOCMGET, &i);
    i |= TIOCM_DTR;		/* DTR = 1 */
    i &= ~TIOCM_RTS;		/* RTS = 0 */
    ioctl(mouse_fd, TIOCMSET, &i);
    usleep(200000);

    /* wait for response */
    FlushInput(mouse_fd);
    i = TIOCM_DTR | TIOCM_RTS;	/* DTR = 1, RTS = 1 */
    ioctl(mouse_fd, TIOCMBIS, &i);

    /* try to read something */
    if (poll(pfd, 1, 200000/1000) <= 0)
        goto connect_idle;
#endif

    /* collect PnP COM device ID (2.1.7) */
    i = 0;
    usleep(200000);	/* the mouse must send `Begin ID' within 200msec */
    while (read(mouse_fd, &c, 1) == 1) {
	/* we may see "M", or "M3..." before `Begin ID' */
        if ((c == 0x08) || (c == 0x28)) {	/* Begin ID */
	    buf[i++] = c;
	    break;
        }
    }
    if (i <= 0) {
	/* we haven't seen `Begin ID' in time... */
	goto connect_idle;
    }

    ++c;			/* make it `End ID' */
    for (;;) {
        if (poll(pfd, 1, 200000/1000) <= 0)
	    break;

	read(mouse_fd, &buf[i], 1);
        if (buf[i++] == c)	/* End ID */
	    break;
	if (i >= 256)
	    break;
    }
    if (buf[i - 1] != c)
	goto connect_idle;
    return i;
    
#if 0
    /*
     * According to PnP spec, we should set DTR = 1 and RTS = 0 while 
     * in idle state.  But, `moused' shall set DTR = RTS = 1 and proceed, 
     * assuming there is something at the port even if it didn't 
     * respond to the PnP enumeration procedure.
     */
disconnect_idle:
    i = TIOCM_DTR | TIOCM_RTS;		/* DTR = 1, RTS = 1 */
    ioctl(mouse_fd, TIOCMBIS, &i);
#endif

connect_idle:
    return 0;
}

/* pnpparse : parse a PnP string ID */
static int
pnpparse(pnpid_t *id, char *buf, int len)
{
    char s[3];
    int offset;
    int sum = 0;
    int i, j;

    id->revision = 0;
    id->eisaid = NULL;
    id->serial = NULL;
    id->class = NULL;
    id->compat = NULL;
    id->description = NULL;
    id->neisaid = 0;
    id->nserial = 0;
    id->nclass = 0;
    id->ncompat = 0;
    id->ndescription = 0;

    offset = 0x28 - buf[0];

    /* calculate checksum */
    for (i = 0; i < len - 3; ++i) {
	sum += buf[i];
	buf[i] += offset;
    }
    sum += buf[len - 1];
    for (; i < len; ++i)
	buf[i] += offset;
    debug("Mouse: PnP ID string: '%*.*s'\n", len, len, buf);

    /* revision */
    buf[1] -= offset;
    buf[2] -= offset;
    id->revision = ((buf[1] & 0x3f) << 6) | (buf[2] & 0x3f);
    debug("Mouse: PnP rev %d.%02d\n", id->revision / 100, id->revision % 100);

    /* EISA vender and product ID */
    id->eisaid = &buf[3];
    id->neisaid = 7;

    /* option strings */
    i = 10;
    if (buf[i] == '\\') {
        /* device serial # */
        for (j = ++i; i < len; ++i) {
            if (buf[i] == '\\')
		break;
        }
	if (i >= len)
	    i -= 3;
	if (i - j == 8) {
            id->serial = &buf[j];
            id->nserial = 8;
	}
    }
    if (buf[i] == '\\') {
        /* PnP class */
        for (j = ++i; i < len; ++i) {
            if (buf[i] == '\\')
		break;
        }
	if (i >= len)
	    i -= 3;
	if (i > j + 1) {
            id->class = &buf[j];
            id->nclass = i - j;
        }
    }
    if (buf[i] == '\\') {
	/* compatible driver */
        for (j = ++i; i < len; ++i) {
            if (buf[i] == '\\')
		break;
        }
	/*
	 * PnP COM spec prior to v0.96 allowed '*' in this field, 
	 * it's not allowed now; just ignore it.
	 */
	if (buf[j] == '*')
	    ++j;
	if (i >= len)
	    i -= 3;
	if (i > j + 1) {
            id->compat = &buf[j];
            id->ncompat = i - j;
        }
    }
    if (buf[i] == '\\') {
	/* product description */
        for (j = ++i; i < len; ++i) {
            if (buf[i] == ';')
		break;
        }
	if (i >= len)
	    i -= 3;
	if (i > j + 1) {
            id->description = &buf[j];
            id->ndescription = i - j;
        }
    }

    /* checksum exists if there are any optional fields */
    if ((id->nserial > 0) || (id->nclass > 0)
	|| (id->ncompat > 0) || (id->ndescription > 0)) {
#if 0
        debug("Mouse: PnP checksum: 0x%02X\n", sum); 
#endif
        sprintf(s, "%02X", sum & 0x0ff);
        if (strncmp(s, &buf[len - 3], 2) != 0) {
#if 0
            /* 
	     * Checksum error!!
	     * I found some mice do not comply with the PnP COM device 
	     * spec regarding checksum... XXX
	     */
	    return FALSE;
#endif
        }
    }

    return 1;
}

/* pnpproto : return the prototype used, based on the PnP ID string */
static symtab_t *
pnpproto(pnpid_t *id)
{
    symtab_t *t;
    int i, j;

    if (id->nclass > 0)
	if (strncmp(id->class, "MOUSE", id->nclass) != 0)
	    /* this is not a mouse! */
	    return NULL;

    if (id->neisaid > 0) {
        t = gettoken(pnpprod, id->eisaid, id->neisaid);
	if (t->val != -1)
            return t;
    }
    /*
     * The 'Compatible drivers' field may contain more than one
     * ID separated by ','.
     */
    if (id->ncompat <= 0)
	return NULL;
    for (i = 0; i < id->ncompat; ++i) {
        for (j = i; id->compat[i] != ','; ++i)
            if (i >= id->ncompat)
		break;
        if (i > j) {
            t = gettoken(pnpprod, id->compat + j, i - j);
	    if (t->val != -1)
                return t;
	}
    }

    return NULL;
}

/* mouse_init : init the mouse by writing appropriate sequences */
void
mouse_init(void)
{
    struct pollfd pfd[1];
    char *s;
    char c;
    int i;

    if (IS_WSMOUSE_DEV(mouse.portname)) {
	    wsmouse_init();
	    return ;
    }
	    
    pfd[0].fd = mouse.mfd;
    pfd[0].events = POLLIN;

    /**
     ** This comment is a little out of context here, but it contains 
     ** some useful information...
     ********************************************************************
     **
     ** The following lines take care of the Logitech MouseMan protocols.
     **
     ** NOTE: There are diffrent versions of both MouseMan and TrackMan!
     **       Hence I add another protocol P_LOGIMAN, which the user can
     **       specify as MouseMan in his XF86Config file. This entry was
     **       formerly handled as a special case of P_MS. However, people
     **       who don't have the middle button problem, can still specify
     **       Microsoft and use P_MS.
     **
     ** By default, these mice should use a 3 byte Microsoft protocol
     ** plus a 4th byte for the middle button. However, the mouse might
     ** have switched to a different protocol before we use it, so I send
     ** the proper sequence just in case.
     **
     ** NOTE: - all commands to (at least the European) MouseMan have to
     **         be sent at 1200 Baud.
     **       - each command starts with a '*'.
     **       - whenever the MouseMan receives a '*', it will switch back
     **	 to 1200 Baud. Hence I have to select the desired protocol
     **	 first, then select the baud rate.
     **
     ** The protocols supported by the (European) MouseMan are:
     **   -  5 byte packed binary protocol, as with the Mouse Systems
     **      mouse. Selected by sequence "*U".
     **   -  2 button 3 byte MicroSoft compatible protocol. Selected
     **      by sequence "*V".
     **   -  3 button 3+1 byte MicroSoft compatible protocol (default).
     **      Selected by sequence "*X".
     **
     ** The following baud rates are supported:
     **   -  1200 Baud (default). Selected by sequence "*n".
     **   -  9600 Baud. Selected by sequence "*q".
     **
     ** Selecting a sample rate is no longer supported with the MouseMan!
     ** Some additional lines in xf86Config.c take care of ill configured
     ** baud rates and sample rates. (The user will get an error.)
     */

    switch (mouse.proto) {

    case P_LOGI:
	/* 
	 * The baud rate selection command must be sent at the current
	 * baud rate; try all likely settings 
	 */
	SetMouseSpeed(9600, mouse.baudrate, mousecflags[mouse.proto]);
	SetMouseSpeed(4800, mouse.baudrate, mousecflags[mouse.proto]);
	SetMouseSpeed(2400, mouse.baudrate, mousecflags[mouse.proto]);
	// SetMouseSpeed(1200, mouse.baudrate, mousecflags[mouse.proto]);
	/* select MM series data format */
	write(mouse.mfd, "S", 1);
	SetMouseSpeed(mouse.baudrate, mouse.baudrate,
		      mousecflags[P_MM]);
	/* select report rate/frequency */
	if      (mouse.rate <= 0)   write(mouse.mfd, "O", 1);
	else if (mouse.rate <= 15)  write(mouse.mfd, "J", 1);
	else if (mouse.rate <= 27)  write(mouse.mfd, "K", 1);
	else if (mouse.rate <= 42)  write(mouse.mfd, "L", 1);
	else if (mouse.rate <= 60)  write(mouse.mfd, "R", 1);
	else if (mouse.rate <= 85)  write(mouse.mfd, "M", 1);
	else if (mouse.rate <= 125) write(mouse.mfd, "Q", 1);
	else			     write(mouse.mfd, "N", 1);
	break;

    case P_LOGIMAN:
	/* The command must always be sent at 1200 baud */
	SetMouseSpeed(1200, 1200, mousecflags[mouse.proto]);
	write(mouse.mfd, "*X", 2);
	SetMouseSpeed(1200, mouse.baudrate, mousecflags[mouse.proto]);
	break;

    case P_MMHIT:
	SetMouseSpeed(1200, mouse.baudrate, mousecflags[mouse.proto]);

	/*
	 * Initialize Hitachi PUMA Plus - Model 1212E to desired settings.
	 * The tablet must be configured to be in MM mode, NO parity,
	 * Binary Format.  xf86Info.sampleRate controls the sensativity
	 * of the tablet.  We only use this tablet for it's 4-button puck
	 * so we don't run in "Absolute Mode"
	 */
	write(mouse.mfd, "z8", 2);	/* Set Parity = "NONE" */
	usleep(50000);
	write(mouse.mfd, "zb", 2);	/* Set Format = "Binary" */
	usleep(50000);
	write(mouse.mfd, "@", 1);	/* Set Report Mode = "Stream" */
	usleep(50000);
	write(mouse.mfd, "R", 1);	/* Set Output Rate = "45 rps" */
	usleep(50000);
	write(mouse.mfd, "I\x20", 2);	/* Set Incrememtal Mode "20" */
	usleep(50000);
	write(mouse.mfd, "E", 1);	/* Set Data Type = "Relative */
	usleep(50000);

	/* Resolution is in 'lines per inch' on the Hitachi tablet */
	if      (mouse.resolution == MOUSE_RES_LOW) 		c = 'g';
	else if (mouse.resolution == MOUSE_RES_MEDIUMLOW)	c = 'e';
	else if (mouse.resolution == MOUSE_RES_MEDIUMHIGH)	c = 'h';
	else if (mouse.resolution == MOUSE_RES_HIGH)		c = 'd';
	else if (mouse.resolution <=   40) 			c = 'g';
	else if (mouse.resolution <=  100) 			c = 'd';
	else if (mouse.resolution <=  200) 			c = 'e';
	else if (mouse.resolution <=  500) 			c = 'h';
	else if (mouse.resolution <= 1000) 			c = 'j';
	else                                			c = 'd';
	write(mouse.mfd, &c, 1);
	usleep(50000);

	write(mouse.mfd, "\021", 1);	/* Resume DATA output */
	break;

    case P_THINKING:
	SetMouseSpeed(1200, mouse.baudrate, mousecflags[mouse.proto]);
	/* the PnP ID string may be sent again, discard it */
	usleep(200000);
	i = FREAD;
	ioctl(mouse.mfd, TIOCFLUSH, &i);
	/* send the command to initialize the beast */
	for (s = "E5E5"; *s; ++s) {
	    write(mouse.mfd, s, 1);

	    if (poll(pfd, 1, -1) <= 0)
		break;
	    read(mouse.mfd, &c, 1);
	    debug("%c", c);
	    if (c != *s)
	        break;
	}
	break;

    case P_MSC:
	SetMouseSpeed(1200, mouse.baudrate, mousecflags[mouse.proto]);
#if 0
	if (mouse.flags & ClearDTR) {
	   i = TIOCM_DTR;
	   ioctl(mouse.mfd, TIOCMBIC, &i);
        }
        if (mouse.flags & ClearRTS) {
	   i = TIOCM_RTS;
	   ioctl(mouse.mfd, TIOCMBIC, &i);
        }
#endif
	break;

    default:
	SetMouseSpeed(1200, mouse.baudrate, mousecflags[mouse.proto]);
	break;
    }
}

/* mouse_identify : identify the protocol used by the mouse */
int
mouse_identify(void)
{
	char pnpbuf[256];/* PnP identifier string may be up to 256 bytes long */
	pnpid_t pnpid;
    	symtab_t *t;
	int len;

	/* protocol has been specified with '-t' */
	if (mouse.proto != P_UNKNOWN)
		bcopy(proto[mouse.proto], cur_proto, sizeof(cur_proto));
	else {	
		/* maybe this is an PnP mouse... */
		if (mouse.flags & NoPnP)
			return mouse.proto;
		if (((len = pnpgets(mouse.mfd, pnpbuf)) <= 0) 
				|| !pnpparse(&pnpid, pnpbuf, len))
			return mouse.proto;

		debug("PnP serial mouse: '%*.*s' '%*.*s' '%*.*s'",
				pnpid.neisaid, pnpid.neisaid,
				pnpid.eisaid, pnpid.ncompat, 
				pnpid.ncompat, pnpid.compat, 
				pnpid.ndescription, pnpid.ndescription, 
				pnpid.description);

		/* we have a valid PnP serial device ID */
		t = pnpproto(&pnpid);
		if (t != NULL) {
			mouse.proto = t->val;
			bcopy(proto[mouse.proto], cur_proto, sizeof(cur_proto));
		}
		else 
			mouse.proto = P_UNKNOWN;

	}

	debug("proto params: %02x %02x %02x %02x %d %02x %02x",
			cur_proto[0], cur_proto[1], cur_proto[2], cur_proto[3], 
			cur_proto[4], cur_proto[5], cur_proto[6]);

	return mouse.proto;
}

/* mouse_protocol : decode bytes with the current mouse protocol */
int
mouse_protocol(u_char rBuf, mousestatus_t *act)
{
	/* MOUSE_MSS_BUTTON?DOWN -> MOUSE_BUTTON?DOWN */
    static int butmapmss[4] = {	/* Microsoft, MouseMan, GlidePoint, 
				   IntelliMouse, Thinking Mouse */
	0, 
	MOUSE_BUTTON3DOWN, 
	MOUSE_BUTTON1DOWN, 
	MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN, 
    };
    static int butmapmss2[4] = { /* Microsoft, MouseMan, GlidePoint, 
				    Thinking Mouse */
	0, 
	MOUSE_BUTTON4DOWN, 
	MOUSE_BUTTON2DOWN, 
	MOUSE_BUTTON2DOWN | MOUSE_BUTTON4DOWN, 
    };
    /* MOUSE_INTELLI_BUTTON?DOWN -> MOUSE_BUTTON?DOWN */
    static int butmapintelli[4] = { /* IntelliMouse, NetMouse, Mie Mouse,
				       MouseMan+ */
	0, 
	MOUSE_BUTTON2DOWN, 
	MOUSE_BUTTON4DOWN, 
	MOUSE_BUTTON2DOWN | MOUSE_BUTTON4DOWN, 
    };
    /* MOUSE_MSC_BUTTON?UP -> MOUSE_BUTTON?DOWN */
    static int butmapmsc[8] = {	/* MouseSystems, MMSeries, Logitech, 
				   Bus, sysmouse */
	0, 
	MOUSE_BUTTON3DOWN, 
	MOUSE_BUTTON2DOWN, 
	MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN, 
	MOUSE_BUTTON1DOWN, 
	MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN, 
	MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN,
	MOUSE_BUTTON1DOWN | MOUSE_BUTTON2DOWN | MOUSE_BUTTON3DOWN
    };
    /* for Hitachi tablet */
    static int butmaphit[8] = {	/* MM HitTablet */
	0, 
	MOUSE_BUTTON3DOWN, 
	MOUSE_BUTTON2DOWN, 
	MOUSE_BUTTON1DOWN, 
	MOUSE_BUTTON4DOWN, 
	MOUSE_BUTTON5DOWN, 
	MOUSE_BUTTON6DOWN, 
	MOUSE_BUTTON7DOWN, 
    };
    /* for PS/2 VersaPad */
    static int butmapversaps2[8] = { /* VersaPad */
	0, 
	MOUSE_BUTTON3DOWN, 
	0, 
	MOUSE_BUTTON3DOWN, 
	MOUSE_BUTTON1DOWN, 
	MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN, 
	MOUSE_BUTTON1DOWN, 
	MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN, 
    };
    static int           pBufP = 0;
    static unsigned char pBuf[8];
    static int		 prev_x, prev_y;
    static int		 on = FALSE;
    int			 x, y;

    debug("received char 0x%x",(int)rBuf);

    /*
     * Hack for resyncing: We check here for a package that is:
     *  a) illegal (detected by wrong data-package header)
     *  b) invalid (0x80 == -128 and that might be wrong for MouseSystems)
     *  c) bad header-package
     *
     * NOTE: b) is a voilation of the MouseSystems-Protocol, since values of
     *       -128 are allowed, but since they are very seldom we can easily
     *       use them as package-header with no button pressed.
     * NOTE/2: On a PS/2 mouse any byte is valid as a data byte. Furthermore,
     *         0x80 is not valid as a header byte. For a PS/2 mouse we skip
     *         checking data bytes.
     *         For resyncing a PS/2 mouse we require the two most significant
     *         bits in the header byte to be 0. These are the overflow bits,
     *         and in case of an overflow we actually lose sync. Overflows
     *         are very rare, however, and we quickly gain sync again after
     *         an overflow condition. This is the best we can do. (Actually,
     *         we could use bit 0x08 in the header byte for resyncing, since
     *         that bit is supposed to be always on, but nobody told
     *         Microsoft...)
     */

    if (pBufP != 0 && ((rBuf & cur_proto[2]) != cur_proto[3] || rBuf == 0x80))
    {
	pBufP = 0;		/* skip package */
    }
    
    if (pBufP == 0 && (rBuf & cur_proto[0]) != cur_proto[1])
	return 0;

    /* is there an extra data byte? */
    if (pBufP >= cur_proto[4] && (rBuf & cur_proto[0]) != cur_proto[1])
    {
	/*
	 * Hack for Logitech MouseMan Mouse - Middle button
	 *
	 * Unfortunately this mouse has variable length packets: the standard
	 * Microsoft 3 byte packet plus an optional 4th byte whenever the
	 * middle button status changes.
	 *
	 * We have already processed the standard packet with the movement
	 * and button info.  Now post an event message with the old status
	 * of the left and right buttons and the updated middle button.
	 */

	/*
	 * Even worse, different MouseMen and TrackMen differ in the 4th
	 * byte: some will send 0x00/0x20, others 0x01/0x21, or even
	 * 0x02/0x22, so I have to strip off the lower bits.
         *
         * [JCH-96/01/21]
         * HACK for ALPS "fourth button". (It's bit 0x10 of the "fourth byte"
         * and it is activated by tapping the glidepad with the finger! 8^)
         * We map it to bit bit3, and the reverse map in xf86Events just has
         * to be extended so that it is identified as Button 4. The lower
         * half of the reverse-map may remain unchanged.
	 */

        /*
	 * [KY-97/08/03]
	 * Receive the fourth byte only when preceeding three bytes have
	 * been detected (pBufP >= cur_proto[4]).  In the previous
	 * versions, the test was pBufP == 0; thus, we may have mistakingly
	 * received a byte even if we didn't see anything preceeding 
	 * the byte.
	 */

	if ((rBuf & cur_proto[5]) != cur_proto[6]) {
            pBufP = 0;
	    return 0;
	}

	switch (mouse.proto) {

	/*
	 * IntelliMouse, NetMouse (including NetMouse Pro) and Mie Mouse
	 * always send the fourth byte, whereas the fourth byte is
	 * optional for GlidePoint and ThinkingMouse. The fourth byte 
	 * is also optional for MouseMan+ and FirstMouse+ in their 
	 * native mode. It is always sent if they are in the IntelliMouse 
	 * compatible mode.
	 */ 
	case P_IMSERIAL:	/* IntelliMouse, NetMouse, Mie Mouse,
					   MouseMan+ */
	    act->dx = act->dy = 0;
	    act->dz = (rBuf & 0x08) ? (rBuf & 0x0f) - 16 : (rBuf & 0x0f);
	    act->obutton = act->button;
	    act->button = butmapintelli[(rBuf & MOUSE_MSS_BUTTONS) >> 4]
		| (act->obutton & (MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN));
	    break;

	default:
	    act->dx = act->dy = act->dz = 0;
	    act->obutton = act->button;
	    act->button = butmapmss2[(rBuf & MOUSE_MSS_BUTTONS) >> 4]
		| (act->obutton & (MOUSE_BUTTON1DOWN | MOUSE_BUTTON3DOWN));
	    break;
	}

	act->flags = ((act->dx || act->dy || act->dz) ? MOUSE_POSCHANGED : 0)
	    | (act->obutton ^ act->button);
        pBufP = 0;
	return act->flags;
    }
        
    if (pBufP >= cur_proto[4])
	pBufP = 0;
    pBuf[pBufP++] = rBuf;
    if (pBufP != cur_proto[4])
	return 0;
    
    /*
     * assembly full package
     */

    debug("assembled full packet (len %d) %x,%x,%x,%x,%x,%x,%x,%x",
	cur_proto[4], 
	pBuf[0], pBuf[1], pBuf[2], pBuf[3], 
	pBuf[4], pBuf[5], pBuf[6], pBuf[7]);

    act->dz = 0;
    act->obutton = act->button;
    switch (mouse.proto) 
    {
    case P_MS:		/* Microsoft */
    case P_LOGIMAN:	/* MouseMan/TrackMan */
    case P_GLIDEPOINT:	/* GlidePoint */
    case P_THINKING:		/* ThinkingMouse */
    case P_IMSERIAL:		/* IntelliMouse, NetMouse, Mie Mouse,
					   MouseMan+ */
	act->button = (act->obutton & (MOUSE_BUTTON2DOWN | MOUSE_BUTTON4DOWN))
            | butmapmss[(pBuf[0] & MOUSE_MSS_BUTTONS) >> 4];
	act->dx = (char)(((pBuf[0] & 0x03) << 6) | (pBuf[1] & 0x3F));
	act->dy = (char)(((pBuf[0] & 0x0C) << 4) | (pBuf[2] & 0x3F));
	break;
      
    case P_MSC:		/* MouseSystems Corp */
	act->button = butmapmsc[(~pBuf[0]) & MOUSE_MSC_BUTTONS];
	act->dx =    (char)(pBuf[1]) + (char)(pBuf[3]);
	act->dy = - ((char)(pBuf[2]) + (char)(pBuf[4]));
	break;
      
    case P_MMHIT:		/* MM HitTablet */
	act->button = butmaphit[pBuf[0] & 0x07];
	act->dx = (pBuf[0] & MOUSE_MM_XPOSITIVE) ?   pBuf[1] : - pBuf[1];
	act->dy = (pBuf[0] & MOUSE_MM_YPOSITIVE) ? - pBuf[2] :   pBuf[2];
	break;

    case P_MM:		/* MM Series */
    case P_LOGI:		/* Logitech Mice */
	act->button = butmapmsc[pBuf[0] & MOUSE_MSC_BUTTONS];
	act->dx = (pBuf[0] & MOUSE_MM_XPOSITIVE) ?   pBuf[1] : - pBuf[1];
	act->dy = (pBuf[0] & MOUSE_MM_YPOSITIVE) ? - pBuf[2] :   pBuf[2];
	break;
    
	/* XXX 
	 * removed the code for BusMouse and PS/2 protocols 
	 * which are now handled by wsmouse compatible mouse drivers 
	 * XXX
	 */
	
    default:
	return 0;
    }
    
    /* 
     * We don't reset pBufP here yet, as there may be an additional data
     * byte in some protocols. See above.
     */

    /* has something changed? */
    act->flags = ((act->dx || act->dy || act->dz) ? MOUSE_POSCHANGED : 0)
	| (act->obutton ^ act->button);

    return act->flags;
}