The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/tty_tb.c

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    1 /*      $NetBSD: tty_tb.c,v 1.30 2004/03/23 13:22:05 junyoung Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1982, 1986, 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)tty_tb.c    8.2 (Berkeley) 1/9/95
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __KERNEL_RCSID(0, "$NetBSD: tty_tb.c,v 1.30 2004/03/23 13:22:05 junyoung Exp $");
   36 
   37 #include "tb.h"
   38 
   39 /*
   40  * Line discipline for RS232 tablets;
   41  * supplies binary coordinate data.
   42  */
   43 #include <sys/param.h>
   44 #include <sys/tablet.h>
   45 #include <sys/systm.h>
   46 #include <sys/conf.h>
   47 #include <sys/ioctl.h>
   48 #include <sys/ioctl_compat.h>
   49 #include <sys/tty.h>
   50 #include <sys/proc.h>
   51 
   52 union tbpos {
   53         struct  hitpos hitpos;
   54         struct  gtcopos gtcopos;
   55         struct  polpos polpos;
   56 };
   57 
   58 /*
   59  * Tablet configuration table.
   60  */
   61 struct  tbconf {
   62         short   tbc_recsize;    /* input record size in bytes */
   63         short   tbc_uiosize;    /* size of data record returned user */
   64         int     tbc_sync;       /* mask for finding sync byte/bit */
   65                                 /* decoding routine */
   66         void    (*tbc_decode)(const struct tbconf *, char *, union tbpos *);
   67         u_char  *tbc_run;       /* enter run mode sequence */
   68         u_char  *tbc_point;     /* enter point mode sequence */
   69         u_char  *tbc_stop;      /* stop sequence */
   70         u_char  *tbc_start;     /* start/restart sequence */
   71         int     tbc_flags;
   72 #define TBF_POL         0x1     /* polhemus hack */
   73 #define TBF_INPROX      0x2     /* tablet has proximity info */
   74 };
   75 
   76 static void gtcodecode(const struct tbconf *, char *, union tbpos *);
   77 static void tbolddecode(const struct tbconf *, char *, union tbpos *);
   78 static void tblresdecode(const struct tbconf *, char *, union tbpos *);
   79 static void tbhresdecode(const struct tbconf *, char *, union tbpos *);
   80 static void poldecode(const struct tbconf *, char *, union tbpos *);
   81 
   82 
   83 static const struct     tbconf tbconf[TBTYPE] = {
   84 { 0 },
   85 { 5, sizeof(struct hitpos), 0200, tbolddecode, "6", "4" },
   86 { 5, sizeof(struct hitpos), 0200, tbolddecode, "\1CN", "\1RT", "\2", "\4" },
   87 { 8, sizeof(struct gtcopos), 0200, gtcodecode },
   88 {17, sizeof(struct polpos), 0200, poldecode, 0, 0, "\21", "\5\22\2\23",
   89   TBF_POL },
   90 { 5, sizeof(struct hitpos), 0100, tblresdecode, "\1CN", "\1PT", "\2", "\4",
   91   TBF_INPROX },
   92 { 6, sizeof(struct hitpos), 0200, tbhresdecode, "\1CN", "\1PT", "\2", "\4",
   93   TBF_INPROX },
   94 { 5, sizeof(struct hitpos), 0100, tblresdecode, "\1CL\33", "\1PT\33", 0, 0},
   95 { 6, sizeof(struct hitpos), 0200, tbhresdecode, "\1CL\33", "\1PT\33", 0, 0},
   96 };
   97 
   98 /*
   99  * Tablet state
  100  */
  101 struct tb {
  102         int     tbflags;                /* mode & type bits */
  103 #define TBMAXREC        17      /* max input record size */
  104         char    cbuf[TBMAXREC];         /* input buffer */
  105         int     tbinbuf;
  106         char    *tbcp;
  107         union   tbpos tbpos; 
  108 } tb[NTB];
  109 
  110 
  111 int     tbopen(dev_t, struct tty *);
  112 void    tbclose(struct tty *);
  113 int     tbread(struct tty *, struct uio *);
  114 void    tbinput(int, struct tty *);
  115 int     tbtioctl(struct tty *, u_long, caddr_t, int, struct proc *);
  116 void    tbattach(int);
  117 
  118 /*
  119  * Open as tablet discipline; called on discipline change.
  120  */
  121 /*ARGSUSED*/
  122 int
  123 tbopen(dev, tp)
  124         dev_t dev;
  125         struct tty *tp;
  126 {
  127         struct tb *tbp;
  128 
  129         if (tp->t_linesw->l_no == TABLDISC)
  130                 return (ENODEV);
  131         ttywflush(tp);
  132         for (tbp = tb; tbp < &tb[NTB]; tbp++)
  133                 if (tbp->tbflags == 0)
  134                         break;
  135         if (tbp >= &tb[NTB])
  136                 return (EBUSY);
  137         tbp->tbflags = TBTIGER|TBPOINT;         /* default */
  138         tbp->tbcp = tbp->cbuf;
  139         tbp->tbinbuf = 0;
  140         memset((caddr_t)&tbp->tbpos, 0, sizeof(tbp->tbpos));
  141         tp->t_sc = (caddr_t)tbp;
  142         tp->t_flags |= LITOUT;
  143         return (0);
  144 }
  145 
  146 /*
  147  * Line discipline change or last device close.
  148  */
  149 void
  150 tbclose(tp)
  151         struct tty *tp;
  152 {
  153         int modebits = TBPOINT|TBSTOP;
  154 
  155         tbtioctl(tp, BIOSMODE, (caddr_t) &modebits, 0, curproc);
  156 }
  157 
  158 /*
  159  * Read from a tablet line.
  160  * Characters have been buffered in a buffer and decoded.
  161  */
  162 int
  163 tbread(tp, uio)
  164         struct tty *tp;
  165         struct uio *uio;
  166 {
  167         struct tb *tbp = (struct tb *)tp->t_sc;
  168         const struct tbconf *tc = &tbconf[tbp->tbflags & TBTYPE];
  169         int ret;
  170 
  171         if ((tp->t_state&TS_CARR_ON) == 0)
  172                 return (EIO);
  173         ret = uiomove((caddr_t) &tbp->tbpos, tc->tbc_uiosize, uio);
  174         if (tc->tbc_flags&TBF_POL)
  175                 tbp->tbpos.polpos.p_key = ' ';
  176         return (ret);
  177 }
  178 
  179 /*
  180  * Low level character input routine.
  181  * Stuff the character in the buffer, and decode
  182  * if all the chars are there.
  183  *
  184  * This routine could be expanded in-line in the receiver
  185  * interrupt routine to make it run as fast as possible.
  186  */
  187 void
  188 tbinput(c, tp)
  189         int c;
  190         struct tty *tp;
  191 {
  192         struct tb *tbp = (struct tb *)tp->t_sc;
  193         const struct tbconf *tc = &tbconf[tbp->tbflags & TBTYPE];
  194 
  195         if (tc->tbc_recsize == 0 || tc->tbc_decode == 0)        /* paranoid? */
  196                 return;
  197         /*
  198          * Locate sync bit/byte or reset input buffer.
  199          */
  200         if (c&tc->tbc_sync || tbp->tbinbuf == tc->tbc_recsize) {
  201                 tbp->tbcp = tbp->cbuf;
  202                 tbp->tbinbuf = 0;
  203         }
  204         *tbp->tbcp++ = c&0177;
  205         /*
  206          * Call decode routine only if a full record has been collected.
  207          */
  208         if (++tbp->tbinbuf == tc->tbc_recsize)
  209                 (*tc->tbc_decode)(tc, tbp->cbuf, &tbp->tbpos);
  210 }
  211 
  212 /*
  213  * Decode GTCO 8 byte format (high res, tilt, and pressure).
  214  */
  215 static void
  216 gtcodecode(tc, cp, u)
  217         const struct tbconf *tc;
  218         char *cp;
  219         union tbpos *u;
  220 {
  221         struct gtcopos *pos = &u->gtcopos;
  222         pos->pressure = *cp >> 2;
  223         pos->status = (pos->pressure > 16) | TBINPROX; /* half way down */
  224         pos->xpos = (*cp++ & 03) << 14;
  225         pos->xpos |= *cp++ << 7;
  226         pos->xpos |= *cp++;
  227         pos->ypos = (*cp++ & 03) << 14;
  228         pos->ypos |= *cp++ << 7;
  229         pos->ypos |= *cp++;
  230         pos->xtilt = *cp++;
  231         pos->ytilt = *cp++;
  232         pos->scount++;
  233 }
  234 
  235 /*
  236  * Decode old Hitachi 5 byte format (low res).
  237  */
  238 static void
  239 tbolddecode(tc, cp, u)
  240         const struct tbconf *tc;
  241         char *cp;
  242         union tbpos *u;
  243 {
  244         struct hitpos *pos = &u->hitpos;
  245         char byte;
  246 
  247         byte = *cp++;
  248         pos->status = (byte&0100) ? TBINPROX : 0;
  249         byte &= ~0100;
  250         if (byte > 036)
  251                 pos->status |= 1 << ((byte-040)/2);
  252         pos->xpos = *cp++ << 7;
  253         pos->xpos |= *cp++;
  254         if (pos->xpos < 256)                    /* tablet wraps around at 256 */
  255                 pos->status &= ~TBINPROX;       /* make it out of proximity */
  256         pos->ypos = *cp++ << 7;
  257         pos->ypos |= *cp++;
  258         pos->scount++;
  259 }
  260 
  261 /*
  262  * Decode new Hitach 5-byte format (low res).
  263  */
  264 static void
  265 tblresdecode(tc, cp, u)
  266         const struct tbconf *tc;
  267         char *cp;
  268         union tbpos *u;
  269 {
  270         struct hitpos *pos = &u->hitpos;
  271 
  272         *cp &= ~0100;           /* mask sync bit */
  273         pos->status = (*cp++ >> 2) | TBINPROX;
  274         if (tc->tbc_flags&TBF_INPROX && pos->status&020)
  275                 pos->status &= ~(020|TBINPROX);
  276         pos->xpos = *cp++;
  277         pos->xpos |= *cp++ << 6;
  278         pos->ypos = *cp++;
  279         pos->ypos |= *cp++ << 6;
  280         pos->scount++;
  281 }
  282 
  283 /*
  284  * Decode new Hitach 6-byte format (high res).
  285  */
  286 static void
  287 tbhresdecode(tc, cp, u)
  288         const struct tbconf *tc;
  289         char *cp;
  290         union tbpos *u;
  291 {
  292         struct hitpos *pos = &u->hitpos;
  293         char byte;
  294 
  295         byte = *cp++;
  296         pos->xpos = (byte & 03) << 14;
  297         pos->xpos |= *cp++ << 7;
  298         pos->xpos |= *cp++;
  299         pos->ypos = *cp++ << 14;
  300         pos->ypos |= *cp++ << 7;
  301         pos->ypos |= *cp++;
  302         pos->status = (byte >> 2) | TBINPROX;
  303         if (tc->tbc_flags&TBF_INPROX && pos->status&020)
  304                 pos->status &= ~(020|TBINPROX);
  305         pos->scount++;
  306 }
  307 
  308 /*
  309  * Polhemus decode.
  310  */
  311 static void
  312 poldecode(tc, cp, u)
  313         const struct tbconf *tc;
  314         char *cp;
  315         union tbpos *u;
  316 {
  317         struct polpos *pos = &u->polpos;
  318 
  319         pos->p_x = cp[4] | cp[3]<<7 | (cp[9] & 0x03) << 14;
  320         pos->p_y = cp[6] | cp[5]<<7 | (cp[9] & 0x0c) << 12;
  321         pos->p_z = cp[8] | cp[7]<<7 | (cp[9] & 0x30) << 10;
  322         pos->p_azi = cp[11] | cp[10]<<7 | (cp[16] & 0x03) << 14;
  323         pos->p_pit = cp[13] | cp[12]<<7 | (cp[16] & 0x0c) << 12;
  324         pos->p_rol = cp[15] | cp[14]<<7 | (cp[16] & 0x30) << 10;
  325         pos->p_stat = cp[1] | cp[0]<<7;
  326         if (cp[2] != ' ')
  327                 pos->p_key = cp[2];
  328 }
  329 
  330 /*ARGSUSED*/
  331 int
  332 tbtioctl(tp, cmd, data, flag, p)
  333         struct tty *tp;
  334         u_long cmd;
  335         caddr_t data;
  336         int flag;
  337         struct proc *p;
  338 {
  339         struct tb *tbp = (struct tb *)tp->t_sc;
  340 
  341         switch (cmd) {
  342 
  343         case BIOGMODE:
  344                 *(int *)data = tbp->tbflags & TBMODE;
  345                 break;
  346 
  347         case BIOSTYPE:
  348                 if (tbconf[*(int *)data & TBTYPE].tbc_recsize == 0 ||
  349                     tbconf[*(int *)data & TBTYPE].tbc_decode == 0)
  350                         return (EINVAL);
  351                 tbp->tbflags &= ~TBTYPE;
  352                 tbp->tbflags |= *(int *)data & TBTYPE;
  353                 /* fall thru... to set mode bits */
  354 
  355         case BIOSMODE: {
  356                 const struct tbconf *tc;
  357                 u_char *c;
  358 
  359                 tbp->tbflags &= ~TBMODE;
  360                 tbp->tbflags |= *(int *)data & TBMODE;
  361                 tc = &tbconf[tbp->tbflags & TBTYPE];
  362                 if (tbp->tbflags & TBSTOP) {
  363                         if (tc->tbc_stop)
  364                                 for (c = tc->tbc_stop; *c != '\0'; c++)
  365                                         ttyoutput(*c, tp);
  366                 } else if (tc->tbc_start)
  367                         for (c = tc->tbc_start; *c != '\0'; c++)
  368                                 ttyoutput(*c, tp);
  369                 if (tbp->tbflags & TBPOINT) {
  370                         if (tc->tbc_point)
  371                                 for (c = tc->tbc_point; *c != '\0'; c++)
  372                                         ttyoutput(*c, tp);
  373                 } else if (tc->tbc_run)
  374                         for (c = tc->tbc_run; *c != '\0'; c++)
  375                                 ttyoutput(*c, tp);
  376                 ttstart(tp);
  377                 break;
  378         }
  379 
  380         case BIOGTYPE:
  381                 *(int *)data = tbp->tbflags & TBTYPE;
  382                 break;
  383 
  384         case TIOCSETD:
  385         case TIOCGETD:
  386         case TIOCSLINED:
  387         case TIOCGLINED:
  388         case TIOCGETA:
  389         case TIOCGETP:
  390         case TIOCGETC:
  391                 return (EPASSTHROUGH);  /* pass thru... */
  392 
  393         default:
  394                 /* specifically disallow any other ioctl commands */
  395                 return (ENOTTY);
  396         }
  397         return (0);
  398 }
  399 
  400 void
  401 tbattach(dummy)
  402        int dummy;
  403 {
  404     /* stub to handle side effect of new config */
  405 }

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