text: /*-
   * Copyright (c) 1982, 1986, 1991, 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * 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 the University of
   *	California, Berkeley and its contributors.
   * 4. Neither the name of the University nor the names of its contributors
   *    may be used to endorse or promote products derived from this software
   *    without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
   *
   *	@(#)tty_tb.c	8.1 (Berkeley) 6/10/93
   * $Id: tty_tb.c,v 1.2 1994/08/02 07:42:55 davidg Exp $
   */
  
  #include "tb.h"
  #if NTB > 0
  
  /*
   * Line discipline for RS232 tablets;
   * supplies binary coordinate data.
   */
  #include <sys/param.h>
  #include <sys/tablet.h>
  #include <sys/tty.h>
  
  /*
   * Tablet configuration table.
   */
  struct	tbconf {
  	short	tbc_recsize;	/* input record size in bytes */
  	short	tbc_uiosize;	/* size of data record returned user */
  	int	tbc_sync;	/* mask for finding sync byte/bit */
  	int	(*tbc_decode)();/* decoding routine */
  	char	*tbc_run;	/* enter run mode sequence */
  	char	*tbc_point;	/* enter point mode sequence */
  	char	*tbc_stop;	/* stop sequence */
  	char	*tbc_start;	/* start/restart sequence */
  	int	tbc_flags;
  #define	TBF_POL		0x1	/* polhemus hack */
  #define	TBF_INPROX	0x2	/* tablet has proximity info */
  };
  
  static	int tbdecode(), gtcodecode(), poldecode();
  static	int tblresdecode(), tbhresdecode();
  
  struct	tbconf tbconf[TBTYPE] = {
  { 0 },
  { 5, sizeof (struct tbpos), 0200, tbdecode, "6", "4" },
  { 5, sizeof (struct tbpos), 0200, tbdecode, "\1CN", "\1RT", "\2", "\4" },
  { 8, sizeof (struct gtcopos), 0200, gtcodecode },
  {17, sizeof (struct polpos), 0200, poldecode, 0, 0, "\21", "\5\22\2\23",
    TBF_POL },
  { 5, sizeof (struct tbpos), 0100, tblresdecode, "\1CN", "\1PT", "\2", "\4",
    TBF_INPROX },
  { 6, sizeof (struct tbpos), 0200, tbhresdecode, "\1CN", "\1PT", "\2", "\4",
    TBF_INPROX },
  { 5, sizeof (struct tbpos), 0100, tblresdecode, "\1CL\33", "\1PT\33", 0, 0},
  { 6, sizeof (struct tbpos), 0200, tbhresdecode, "\1CL\33", "\1PT\33", 0, 0},
  };
  
  /*
   * Tablet state
   */
  struct tb {
  	int	tbflags;		/* mode & type bits */
  #define	TBMAXREC	17	/* max input record size */
  	char	cbuf[TBMAXREC];		/* input buffer */
  	union {
  		struct	tbpos tbpos;
  		struct	gtcopos gtcopos;
  		struct	polpos polpos;
  	} rets;				/* processed state */
  #define NTBS	16
  } tb[NTBS];
  
  /*
   * Open as tablet discipline; called on discipline change.
   */
  /*ARGSUSED*/
  tbopen(dev, tp)
  	dev_t dev;
  	register struct tty *tp;
  {
  	register struct tb *tbp;
  
  	if (tp->t_line == TABLDISC)
  		return (ENODEV);
  	ttywflush(tp);
  	for (tbp = tb; tbp < &tb[NTBS]; tbp++)
  		if (tbp->tbflags == 0)
  			break;
  	if (tbp >= &tb[NTBS])
  		return (EBUSY);
  	tbp->tbflags = TBTIGER|TBPOINT;		/* default */
  	tp->t_cp = tbp->cbuf;
  	tp->t_inbuf = 0;
  	bzero((caddr_t)&tbp->rets, sizeof (tbp->rets));
  	tp->T_LINEP = (caddr_t)tbp;
  	tp->t_flags |= LITOUT;
  	return (0);
  }
  
  /*
   * Line discipline change or last device close.
   */
  tbclose(tp)
  	register struct tty *tp;
  {
  	register int s;
  	int modebits = TBPOINT|TBSTOP;
  
  	tbioctl(tp, BIOSMODE, &modebits, 0);
  	s = spltty();
  	((struct tb *)tp->T_LINEP)->tbflags = 0;
  	tp->t_cp = 0;
  	tp->t_inbuf = 0;
  	tp->t_rawq.c_cc = 0;		/* clear queues -- paranoid */
  	tp->t_canq.c_cc = 0;
  	tp->t_line = 0;			/* paranoid: avoid races */
  	splx(s);
  }
  
  /*
   * Read from a tablet line.
   * Characters have been buffered in a buffer and decoded.
   */
  tbread(tp, uio)
  	register struct tty *tp;
  	struct uio *uio;
  {
  	register struct tb *tbp = (struct tb *)tp->T_LINEP;
  	register struct tbconf *tc = &tbconf[tbp->tbflags & TBTYPE];
  	int ret;
  
  	if ((tp->t_state&TS_CARR_ON) == 0)
  		return (EIO);
  	ret = uiomove(&tbp->rets, tc->tbc_uiosize, uio);
  	if (tc->tbc_flags&TBF_POL)
  		tbp->rets.polpos.p_key = ' ';
  	return (ret);
  }
  
  /*
   * Low level character input routine.
   * Stuff the character in the buffer, and decode
   * if all the chars are there.
   *
   * This routine could be expanded in-line in the receiver
   * interrupt routine to make it run as fast as possible.
   */
  tbinput(c, tp)
  	register int c;
  	register struct tty *tp;
  {
  	register struct tb *tbp = (struct tb *)tp->T_LINEP;
  	register struct tbconf *tc = &tbconf[tbp->tbflags & TBTYPE];
  
  	if (tc->tbc_recsize == 0 || tc->tbc_decode == 0)	/* paranoid? */
  		return;
  	/*
  	 * Locate sync bit/byte or reset input buffer.
  	 */
  	if (c&tc->tbc_sync || tp->t_inbuf == tc->tbc_recsize) {
  		tp->t_cp = tbp->cbuf;
  		tp->t_inbuf = 0;
  	}
  	*tp->t_cp++ = c&0177;
  	/*
  	 * Call decode routine only if a full record has been collected.
  	 */
  	if (++tp->t_inbuf == tc->tbc_recsize)
  		(*tc->tbc_decode)(tc, tbp->cbuf, &tbp->rets);
  }
  
  /*
   * Decode GTCO 8 byte format (high res, tilt, and pressure).
   */
  static
  gtcodecode(tc, cp, tbpos)
  	struct tbconf *tc;
  	register char *cp;
  	register struct gtcopos *tbpos;
  {
  
  	tbpos->pressure = *cp >> 2;
  	tbpos->status = (tbpos->pressure > 16) | TBINPROX; /* half way down */
  	tbpos->xpos = (*cp++ & 03) << 14;
  	tbpos->xpos |= *cp++ << 7;
  	tbpos->xpos |= *cp++;
  	tbpos->ypos = (*cp++ & 03) << 14;
  	tbpos->ypos |= *cp++ << 7;
  	tbpos->ypos |= *cp++;
  	tbpos->xtilt = *cp++;
  	tbpos->ytilt = *cp++;
  	tbpos->scount++;
  }
  
  /*
   * Decode old Hitachi 5 byte format (low res).
   */
  static
  tbdecode(tc, cp, tbpos)
  	struct tbconf *tc;
  	register char *cp;
  	register struct tbpos *tbpos;
  {
  	register char byte;
  
  	byte = *cp++;
  	tbpos->status = (byte&0100) ? TBINPROX : 0;
  	byte &= ~0100;
  	if (byte > 036)
  		tbpos->status |= 1 << ((byte-040)/2);
  	tbpos->xpos = *cp++ << 7;
  	tbpos->xpos |= *cp++;
  	if (tbpos->xpos < 256)			/* tablet wraps around at 256 */
  		tbpos->status &= ~TBINPROX;	/* make it out of proximity */
  	tbpos->ypos = *cp++ << 7;
  	tbpos->ypos |= *cp++;
  	tbpos->scount++;
  }
  
  /*
   * Decode new Hitach 5-byte format (low res).
   */
  static
  tblresdecode(tc, cp, tbpos)
  	struct tbconf *tc;
  	register char *cp;
  	register struct tbpos *tbpos;
  {
  
  	*cp &= ~0100;		/* mask sync bit */
  	tbpos->status = (*cp++ >> 2) | TBINPROX;
  	if (tc->tbc_flags&TBF_INPROX && tbpos->status&020)
  		tbpos->status &= ~(020|TBINPROX);
  	tbpos->xpos = *cp++;
  	tbpos->xpos |= *cp++ << 6;
  	tbpos->ypos = *cp++;
  	tbpos->ypos |= *cp++ << 6;
  	tbpos->scount++;
  }
  
  /*
   * Decode new Hitach 6-byte format (high res).
   */
  static
  tbhresdecode(tc, cp, tbpos)
  	struct tbconf *tc;
  	register char *cp;
  	register struct tbpos *tbpos;
  {
  	char byte;
  
  	byte = *cp++;
  	tbpos->xpos = (byte & 03) << 14;
  	tbpos->xpos |= *cp++ << 7;
  	tbpos->xpos |= *cp++;
  	tbpos->ypos = *cp++ << 14;
  	tbpos->ypos |= *cp++ << 7;
  	tbpos->ypos |= *cp++;
  	tbpos->status = (byte >> 2) | TBINPROX;
  	if (tc->tbc_flags&TBF_INPROX && tbpos->status&020)
  		tbpos->status &= ~(020|TBINPROX);
  	tbpos->scount++;
  }
  
  /*
   * Polhemus decode.
   */
  static
  poldecode(tc, cp, polpos)
  	struct tbconf *tc;
  	register char *cp;
  	register struct polpos *polpos;
  {
  
  	polpos->p_x = cp[4] | cp[3]<<7 | (cp[9] & 0x03) << 14;
  	polpos->p_y = cp[6] | cp[5]<<7 | (cp[9] & 0x0c) << 12;
  	polpos->p_z = cp[8] | cp[7]<<7 | (cp[9] & 0x30) << 10;
  	polpos->p_azi = cp[11] | cp[10]<<7 | (cp[16] & 0x03) << 14;
  	polpos->p_pit = cp[13] | cp[12]<<7 | (cp[16] & 0x0c) << 12;
  	polpos->p_rol = cp[15] | cp[14]<<7 | (cp[16] & 0x30) << 10;
  	polpos->p_stat = cp[1] | cp[0]<<7;
  	if (cp[2] != ' ')
  		polpos->p_key = cp[2];
  }
  
  /*ARGSUSED*/
  tbioctl(tp, cmd, data, flag)
  	struct tty *tp;
  	caddr_t data;
  {
  	register struct tb *tbp = (struct tb *)tp->T_LINEP;
  
  	switch (cmd) {
  
  	case BIOGMODE:
  		*(int *)data = tbp->tbflags & TBMODE;
  		break;
  
  	case BIOSTYPE:
  		if (tbconf[*(int *)data & TBTYPE].tbc_recsize == 0 ||
  		    tbconf[*(int *)data & TBTYPE].tbc_decode == 0)
  			return (EINVAL);
  		tbp->tbflags &= ~TBTYPE;
  		tbp->tbflags |= *(int *)data & TBTYPE;
  		/* fall thru... to set mode bits */
  
  	case BIOSMODE: {
  		register struct tbconf *tc;
  
  		tbp->tbflags &= ~TBMODE;
  		tbp->tbflags |= *(int *)data & TBMODE;
  		tc = &tbconf[tbp->tbflags & TBTYPE];
  		if (tbp->tbflags&TBSTOP) {
  			if (tc->tbc_stop)
  				ttyout(tc->tbc_stop, tp);
  		} else if (tc->tbc_start)
  			ttyout(tc->tbc_start, tp);
  		if (tbp->tbflags&TBPOINT) {
  			if (tc->tbc_point)
  				ttyout(tc->tbc_point, tp);
  		} else if (tc->tbc_run)
  			ttyout(tc->tbc_run, tp);
  		ttstart(tp);
  		break;
  	}
  
  	case BIOGTYPE:
  		*(int *)data = tbp->tbflags & TBTYPE;
  		break;
  
  	case TIOCSETD:
  	case TIOCGETD:
  	case TIOCGETP:
  	case TIOCGETC:
  		return (-1);		/* pass thru... */
  
  	default:
  		return (ENOTTY);
  	}
  	return (0);
  }
  #endif
  