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Annotation of XNU/bsd/kern/tty_tb.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * The contents of this file constitute Original Code as defined in and
        !             7:  * are subject to the Apple Public Source License Version 1.1 (the
        !             8:  * "License").  You may not use this file except in compliance with the
        !             9:  * License.  Please obtain a copy of the License at
        !            10:  * http://www.apple.com/publicsource and read it before using this file.
        !            11:  * 
        !            12:  * This Original Code and all software distributed under the License are
        !            13:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            14:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            15:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            16:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            17:  * License for the specific language governing rights and limitations
        !            18:  * under the License.
        !            19:  * 
        !            20:  * @APPLE_LICENSE_HEADER_END@
        !            21:  */
        !            22: /* Copyright (c) 1997 Apple Computer, Inc. All Rights Reserved */
        !            23: /*-
        !            24:  * Copyright (c) 1982, 1986, 1991, 1993
        !            25:  *     The Regents of the University of California.  All rights reserved.
        !            26:  *
        !            27:  *     @(#)tty_tb.c    8.1 (Berkeley) 6/10/93
        !            28:  */
        !            29: 
        !            30: #include "tb.h"
        !            31: #if NTB > 0
        !            32: 
        !            33: /*
        !            34:  * Line discipline for RS232 tablets;
        !            35:  * supplies binary coordinate data.
        !            36:  */
        !            37: #include <sys/param.h>
        !            38: #include <sys/tablet.h>
        !            39: #include <sys/tty.h>
        !            40: #if NeXT
        !            41: #include <sys/proc.h>
        !            42: #endif
        !            43: 
        !            44: /*
        !            45:  * Tablet configuration table.
        !            46:  */
        !            47: struct tbconf {
        !            48:        short   tbc_recsize;    /* input record size in bytes */
        !            49:        short   tbc_uiosize;    /* size of data record returned user */
        !            50:        int     tbc_sync;       /* mask for finding sync byte/bit */
        !            51:        int     (*tbc_decode)();/* decoding routine */
        !            52:        char    *tbc_run;       /* enter run mode sequence */
        !            53:        char    *tbc_point;     /* enter point mode sequence */
        !            54:        char    *tbc_stop;      /* stop sequence */
        !            55:        char    *tbc_start;     /* start/restart sequence */
        !            56:        int     tbc_flags;
        !            57: #define        TBF_POL         0x1     /* polhemus hack */
        !            58: #define        TBF_INPROX      0x2     /* tablet has proximity info */
        !            59: };
        !            60: 
        !            61: static int tbdecode(), gtcodecode(), poldecode();
        !            62: static int tblresdecode(), tbhresdecode();
        !            63: 
        !            64: struct tbconf tbconf[TBTYPE] = {
        !            65: { 0 },
        !            66: { 5, sizeof (struct tbpos), 0200, tbdecode, "6", "4" },
        !            67: { 5, sizeof (struct tbpos), 0200, tbdecode, "\1CN", "\1RT", "\2", "\4" },
        !            68: { 8, sizeof (struct gtcopos), 0200, gtcodecode },
        !            69: {17, sizeof (struct polpos), 0200, poldecode, 0, 0, "\21", "\5\22\2\23",
        !            70:   TBF_POL },
        !            71: { 5, sizeof (struct tbpos), 0100, tblresdecode, "\1CN", "\1PT", "\2", "\4",
        !            72:   TBF_INPROX },
        !            73: { 6, sizeof (struct tbpos), 0200, tbhresdecode, "\1CN", "\1PT", "\2", "\4",
        !            74:   TBF_INPROX },
        !            75: { 5, sizeof (struct tbpos), 0100, tblresdecode, "\1CL\33", "\1PT\33", 0, 0},
        !            76: { 6, sizeof (struct tbpos), 0200, tbhresdecode, "\1CL\33", "\1PT\33", 0, 0},
        !            77: };
        !            78: 
        !            79: /*
        !            80:  * Tablet state
        !            81:  */
        !            82: struct tb {
        !            83:        int     tbflags;                /* mode & type bits */
        !            84: #define        TBMAXREC        17      /* max input record size */
        !            85:        char    cbuf[TBMAXREC];         /* input buffer */
        !            86:        union {
        !            87:                struct  tbpos tbpos;
        !            88:                struct  gtcopos gtcopos;
        !            89:                struct  polpos polpos;
        !            90:        } rets;                         /* processed state */
        !            91: #define NTBS   16
        !            92: } tb[NTBS];
        !            93: 
        !            94: /*
        !            95:  * Open as tablet discipline; called on discipline change.
        !            96:  */
        !            97: /*ARGSUSED*/
        !            98: tbopen(dev, tp)
        !            99:        dev_t dev;
        !           100:        register struct tty *tp;
        !           101: {
        !           102:        register struct tb *tbp;
        !           103: 
        !           104:        if (tp->t_line == TABLDISC)
        !           105:                return (ENODEV);
        !           106:        ttywflush(tp);
        !           107:        for (tbp = tb; tbp < &tb[NTBS]; tbp++)
        !           108:                if (tbp->tbflags == 0)
        !           109:                        break;
        !           110:        if (tbp >= &tb[NTBS])
        !           111:                return (EBUSY);
        !           112:        tbp->tbflags = TBTIGER|TBPOINT;         /* default */
        !           113:        tp->t_cp = tbp->cbuf;
        !           114:        tp->t_inbuf = 0;
        !           115:        bzero((caddr_t)&tbp->rets, sizeof (tbp->rets));
        !           116:        tp->T_LINEP = (caddr_t)tbp;
        !           117:        tp->t_flags |= LITOUT;
        !           118:        return (0);
        !           119: }
        !           120: 
        !           121: /*
        !           122:  * Line discipline change or last device close.
        !           123:  */
        !           124: tbclose(tp)
        !           125:        register struct tty *tp;
        !           126: {
        !           127:        register int s;
        !           128:        int modebits = TBPOINT|TBSTOP;
        !           129: 
        !           130: #ifndef NeXT
        !           131:        tbioctl(tp, BIOSMODE, &modebits, 0);
        !           132: #else
        !           133:        tbioctl(tp, BIOSMODE, &modebits, 0, current_proc());
        !           134: #endif
        !           135:        s = spltty();
        !           136:        ((struct tb *)tp->T_LINEP)->tbflags = 0;
        !           137:        tp->t_cp = 0;
        !           138:        tp->t_inbuf = 0;
        !           139:        tp->t_rawq.c_cc = 0;            /* clear queues -- paranoid */
        !           140:        tp->t_canq.c_cc = 0;
        !           141:        tp->t_line = 0;                 /* paranoid: avoid races */
        !           142:        splx(s);
        !           143: }
        !           144: 
        !           145: /*
        !           146:  * Read from a tablet line.
        !           147:  * Characters have been buffered in a buffer and decoded.
        !           148:  */
        !           149: tbread(tp, uio)
        !           150:        register struct tty *tp;
        !           151:        struct uio *uio;
        !           152: {
        !           153:        register struct tb *tbp = (struct tb *)tp->T_LINEP;
        !           154:        register struct tbconf *tc = &tbconf[tbp->tbflags & TBTYPE];
        !           155:        int ret;
        !           156: 
        !           157:        if ((tp->t_state&TS_CARR_ON) == 0)
        !           158:                return (EIO);
        !           159:        ret = uiomove(&tbp->rets, tc->tbc_uiosize, uio);
        !           160:        if (tc->tbc_flags&TBF_POL)
        !           161:                tbp->rets.polpos.p_key = ' ';
        !           162:        return (ret);
        !           163: }
        !           164: 
        !           165: /*
        !           166:  * Low level character input routine.
        !           167:  * Stuff the character in the buffer, and decode
        !           168:  * if all the chars are there.
        !           169:  *
        !           170:  * This routine could be expanded in-line in the receiver
        !           171:  * interrupt routine to make it run as fast as possible.
        !           172:  */
        !           173: tbinput(c, tp)
        !           174:        register int c;
        !           175:        register struct tty *tp;
        !           176: {
        !           177:        register struct tb *tbp = (struct tb *)tp->T_LINEP;
        !           178:        register struct tbconf *tc = &tbconf[tbp->tbflags & TBTYPE];
        !           179: 
        !           180:        if (tc->tbc_recsize == 0 || tc->tbc_decode == 0)        /* paranoid? */
        !           181:                return;
        !           182:        /*
        !           183:         * Locate sync bit/byte or reset input buffer.
        !           184:         */
        !           185:        if (c&tc->tbc_sync || tp->t_inbuf == tc->tbc_recsize) {
        !           186:                tp->t_cp = tbp->cbuf;
        !           187:                tp->t_inbuf = 0;
        !           188:        }
        !           189:        *tp->t_cp++ = c&0177;
        !           190:        /*
        !           191:         * Call decode routine only if a full record has been collected.
        !           192:         */
        !           193:        if (++tp->t_inbuf == tc->tbc_recsize)
        !           194:                (*tc->tbc_decode)(tc, tbp->cbuf, &tbp->rets);
        !           195: }
        !           196: 
        !           197: /*
        !           198:  * Decode GTCO 8 byte format (high res, tilt, and pressure).
        !           199:  */
        !           200: static
        !           201: gtcodecode(tc, cp, tbpos)
        !           202:        struct tbconf *tc;
        !           203:        register char *cp;
        !           204:        register struct gtcopos *tbpos;
        !           205: {
        !           206: 
        !           207:        tbpos->pressure = *cp >> 2;
        !           208:        tbpos->status = (tbpos->pressure > 16) | TBINPROX; /* half way down */
        !           209:        tbpos->xpos = (*cp++ & 03) << 14;
        !           210:        tbpos->xpos |= *cp++ << 7;
        !           211:        tbpos->xpos |= *cp++;
        !           212:        tbpos->ypos = (*cp++ & 03) << 14;
        !           213:        tbpos->ypos |= *cp++ << 7;
        !           214:        tbpos->ypos |= *cp++;
        !           215:        tbpos->xtilt = *cp++;
        !           216:        tbpos->ytilt = *cp++;
        !           217:        tbpos->scount++;
        !           218: }
        !           219: 
        !           220: /*
        !           221:  * Decode old Hitachi 5 byte format (low res).
        !           222:  */
        !           223: static
        !           224: tbdecode(tc, cp, tbpos)
        !           225:        struct tbconf *tc;
        !           226:        register char *cp;
        !           227:        register struct tbpos *tbpos;
        !           228: {
        !           229:        register char byte;
        !           230: 
        !           231:        byte = *cp++;
        !           232:        tbpos->status = (byte&0100) ? TBINPROX : 0;
        !           233:        byte &= ~0100;
        !           234:        if (byte > 036)
        !           235:                tbpos->status |= 1 << ((byte-040)/2);
        !           236:        tbpos->xpos = *cp++ << 7;
        !           237:        tbpos->xpos |= *cp++;
        !           238:        if (tbpos->xpos < 256)                  /* tablet wraps around at 256 */
        !           239:                tbpos->status &= ~TBINPROX;     /* make it out of proximity */
        !           240:        tbpos->ypos = *cp++ << 7;
        !           241:        tbpos->ypos |= *cp++;
        !           242:        tbpos->scount++;
        !           243: }
        !           244: 
        !           245: /*
        !           246:  * Decode new Hitach 5-byte format (low res).
        !           247:  */
        !           248: static
        !           249: tblresdecode(tc, cp, tbpos)
        !           250:        struct tbconf *tc;
        !           251:        register char *cp;
        !           252:        register struct tbpos *tbpos;
        !           253: {
        !           254: 
        !           255:        *cp &= ~0100;           /* mask sync bit */
        !           256:        tbpos->status = (*cp++ >> 2) | TBINPROX;
        !           257:        if (tc->tbc_flags&TBF_INPROX && tbpos->status&020)
        !           258:                tbpos->status &= ~(020|TBINPROX);
        !           259:        tbpos->xpos = *cp++;
        !           260:        tbpos->xpos |= *cp++ << 6;
        !           261:        tbpos->ypos = *cp++;
        !           262:        tbpos->ypos |= *cp++ << 6;
        !           263:        tbpos->scount++;
        !           264: }
        !           265: 
        !           266: /*
        !           267:  * Decode new Hitach 6-byte format (high res).
        !           268:  */
        !           269: static
        !           270: tbhresdecode(tc, cp, tbpos)
        !           271:        struct tbconf *tc;
        !           272:        register char *cp;
        !           273:        register struct tbpos *tbpos;
        !           274: {
        !           275:        char byte;
        !           276: 
        !           277:        byte = *cp++;
        !           278:        tbpos->xpos = (byte & 03) << 14;
        !           279:        tbpos->xpos |= *cp++ << 7;
        !           280:        tbpos->xpos |= *cp++;
        !           281:        tbpos->ypos = *cp++ << 14;
        !           282:        tbpos->ypos |= *cp++ << 7;
        !           283:        tbpos->ypos |= *cp++;
        !           284:        tbpos->status = (byte >> 2) | TBINPROX;
        !           285:        if (tc->tbc_flags&TBF_INPROX && tbpos->status&020)
        !           286:                tbpos->status &= ~(020|TBINPROX);
        !           287:        tbpos->scount++;
        !           288: }
        !           289: 
        !           290: /*
        !           291:  * Polhemus decode.
        !           292:  */
        !           293: static
        !           294: poldecode(tc, cp, polpos)
        !           295:        struct tbconf *tc;
        !           296:        register char *cp;
        !           297:        register struct polpos *polpos;
        !           298: {
        !           299: 
        !           300:        polpos->p_x = cp[4] | cp[3]<<7 | (cp[9] & 0x03) << 14;
        !           301:        polpos->p_y = cp[6] | cp[5]<<7 | (cp[9] & 0x0c) << 12;
        !           302:        polpos->p_z = cp[8] | cp[7]<<7 | (cp[9] & 0x30) << 10;
        !           303:        polpos->p_azi = cp[11] | cp[10]<<7 | (cp[16] & 0x03) << 14;
        !           304:        polpos->p_pit = cp[13] | cp[12]<<7 | (cp[16] & 0x0c) << 12;
        !           305:        polpos->p_rol = cp[15] | cp[14]<<7 | (cp[16] & 0x30) << 10;
        !           306:        polpos->p_stat = cp[1] | cp[0]<<7;
        !           307:        if (cp[2] != ' ')
        !           308:                polpos->p_key = cp[2];
        !           309: }
        !           310: 
        !           311: /*ARGSUSED*/
        !           312: #ifndef NeXT
        !           313: tbioctl(tp, cmd, data, flag)
        !           314:        struct tty *tp;
        !           315:        caddr_t data;
        !           316: #else
        !           317: tbtioctl(tp, cmd, data, flag, p)
        !           318:        struct tty *tp;
        !           319:        u_long cmd;
        !           320:        caddr_t data;
        !           321:        int flag;
        !           322:        struct proc *p;
        !           323: #endif /* !NeXT */
        !           324: {
        !           325:        register struct tb *tbp = (struct tb *)tp->T_LINEP;
        !           326: 
        !           327:        switch (cmd) {
        !           328: 
        !           329:        case BIOGMODE:
        !           330:                *(int *)data = tbp->tbflags & TBMODE;
        !           331:                break;
        !           332: 
        !           333:        case BIOSTYPE:
        !           334:                if (tbconf[*(int *)data & TBTYPE].tbc_recsize == 0 ||
        !           335:                    tbconf[*(int *)data & TBTYPE].tbc_decode == 0)
        !           336:                        return (EINVAL);
        !           337:                tbp->tbflags &= ~TBTYPE;
        !           338:                tbp->tbflags |= *(int *)data & TBTYPE;
        !           339:                /* fall thru... to set mode bits */
        !           340: 
        !           341:        case BIOSMODE: {
        !           342:                register struct tbconf *tc;
        !           343: 
        !           344:                tbp->tbflags &= ~TBMODE;
        !           345:                tbp->tbflags |= *(int *)data & TBMODE;
        !           346:                tc = &tbconf[tbp->tbflags & TBTYPE];
        !           347:                if (tbp->tbflags&TBSTOP) {
        !           348:                        if (tc->tbc_stop)
        !           349:                                ttyout(tc->tbc_stop, tp);
        !           350:                } else if (tc->tbc_start)
        !           351:                        ttyout(tc->tbc_start, tp);
        !           352:                if (tbp->tbflags&TBPOINT) {
        !           353:                        if (tc->tbc_point)
        !           354:                                ttyout(tc->tbc_point, tp);
        !           355:                } else if (tc->tbc_run)
        !           356:                        ttyout(tc->tbc_run, tp);
        !           357:                ttstart(tp);
        !           358:                break;
        !           359:        }
        !           360: 
        !           361:        case BIOGTYPE:
        !           362:                *(int *)data = tbp->tbflags & TBTYPE;
        !           363:                break;
        !           364: 
        !           365:        case TIOCSETD:
        !           366:        case TIOCGETD:
        !           367:        case TIOCGETP:
        !           368:        case TIOCGETC:
        !           369:                return (-1);            /* pass thru... */
        !           370: 
        !           371:        default:
        !           372:                return (ENOTTY);
        !           373:        }
        !           374:        return (0);
        !           375: }
        !           376: #endif /* NTB > 0 */

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