sys/dev/usbmisc/ucom/ucom.c

   1 /*
   2  * $NetBSD: ucom.c,v 1.39 2001/08/16 22:31:24 augustss Exp $
   3  * $NetBSD: ucom.c,v 1.40 2001/11/13 06:24:54 lukem Exp $
   4  * $FreeBSD: src/sys/dev/usb/ucom.c,v 1.35 2003/11/16 11:58:21 akiyama Exp $
   5  * $DragonFly: src/sys/dev/usbmisc/ucom/ucom.c,v 1.32 2007/11/05 19:09:43 hasso Exp $
   6  */
   7 /*-
   8  * Copyright (c) 2001-2002, Shunsuke Akiyama <akiyama@jp.FreeBSD.org>.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
  35  * All rights reserved.
  36  *
  37  * This code is derived from software contributed to The NetBSD Foundation
  38  * by Lennart Augustsson (lennart@augustsson.net) at
  39  * Carlstedt Research & Technology.
  40  *
  41  * Redistribution and use in source and binary forms, with or without
  42  * modification, are permitted provided that the following conditions
  43  * are met:
  44  * 1. Redistributions of source code must retain the above copyright
  45  *    notice, this list of conditions and the following disclaimer.
  46  * 2. Redistributions in binary form must reproduce the above copyright
  47  *    notice, this list of conditions and the following disclaimer in the
  48  *    documentation and/or other materials provided with the distribution.
  49  * 3. All advertising materials mentioning features or use of this software
  50  *    must display the following acknowledgement:
  51  *        This product includes software developed by the NetBSD
  52  *        Foundation, Inc. and its contributors.
  53  * 4. Neither the name of The NetBSD Foundation nor the names of its
  54  *    contributors may be used to endorse or promote products derived
  55  *    from this software without specific prior written permission.
  56  *
  57  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  58  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  59  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  60  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  61  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  62  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  63  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  64  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  65  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  66  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  67  * POSSIBILITY OF SUCH DAMAGE.
  68  */
  69
  70 #include <sys/param.h>
  71 #include <sys/systm.h>
  72 #include <sys/kernel.h>
  73 #include <sys/malloc.h>
  74 #include <sys/bus.h>
  75 #include <sys/fcntl.h>
  76 #include <sys/conf.h>
  77 #include <sys/tty.h>
  78 #include <sys/clist.h>
  79 #include <sys/file.h>
  80 #include <sys/select.h>
  81 #include <sys/proc.h>
  82 #include <sys/priv.h>
  83 #include <sys/sysctl.h>
  84 #include <sys/thread2.h>
  85
  86 #include <bus/usb/usb.h>
  87 #include <bus/usb/usbcdc.h>
  88
  89 #include <bus/usb/usbdi.h>
  90 #include <bus/usb/usbdi_util.h>
  91 #include <bus/usb/usb_quirks.h>
  92
  93 #include "ucomvar.h"
  94
  95 #ifdef USB_DEBUG
  96 static int      ucomdebug = 0;
  97 SYSCTL_NODE(_hw_usb, OID_AUTO, ucom, CTLFLAG_RW, 0, "USB ucom");
  98 SYSCTL_INT(_hw_usb_ucom, OID_AUTO, debug, CTLFLAG_RW,
  99            &ucomdebug, 0, "ucom debug level");
 100 #define DPRINTF(x)      do { \
 101                                 if (ucomdebug) \
 102                                         kprintf x; \
 103                         } while (0)
 104
 105 #define DPRINTFN(n, x)  do { \
 106                                 if (ucomdebug > (n)) \
 107                                         kprintf x; \
 108                         } while (0)
 109 #else
 110 #define DPRINTF(x)
 111 #define DPRINTFN(n, x)
 112 #endif
 113
 114 static d_open_t  ucomopen;
 115 static d_close_t ucomclose;
 116 static d_read_t  ucomread;
 117 static d_write_t ucomwrite;
 118 static d_ioctl_t ucomioctl;
 119
 120 #define UCOM_CDEV_MAJOR  138
 121
 122 static struct dev_ops ucom_ops = {
 123         { "ucom", UCOM_CDEV_MAJOR, D_TTY | D_KQFILTER },
 124         .d_open =       ucomopen,
 125         .d_close =      ucomclose,
 126         .d_read =       ucomread,
 127         .d_write =      ucomwrite,
 128         .d_ioctl =      ucomioctl,
 129         .d_kqfilter =   ttykqfilter,
 130         .d_revoke =     ttyrevoke
 131 };
 132
 133 static void ucom_cleanup(struct ucom_softc *);
 134 static int ucomctl(struct ucom_softc *, int, int);
 135 static int ucomparam(struct tty *, struct termios *);
 136 static void ucomstart(struct tty *);
 137 static void ucomstop(struct tty *, int);
 138 static void ucom_shutdown(struct ucom_softc *);
 139 static void ucom_dtr(struct ucom_softc *, int);
 140 static void ucom_rts(struct ucom_softc *, int);
 141 static void ucom_break(struct ucom_softc *, int);
 142 static usbd_status ucomstartread(struct ucom_softc *);
 143 static void ucomreadcb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 144 static void ucomwritecb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 145 static void ucomstopread(struct ucom_softc *);
 146 static void disc_optim(struct tty *, struct termios *, struct ucom_softc *);
 147
 148 devclass_t ucom_devclass;
 149
 150 static moduledata_t ucom_mod = {
 151         "ucom",
 152         NULL,
 153         NULL
 154 };
 155
 156 DECLARE_MODULE(ucom, ucom_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
 157 MODULE_DEPEND(ucom, usb, 1, 1, 1);
 158 MODULE_VERSION(ucom, UCOM_MODVER);
 159
 160 int
 161 ucom_attach(struct ucom_softc *sc)
 162 {
 163         struct tty *tp;
 164         int unit;
 165         cdev_t dev;
 166
 167         unit = device_get_unit(sc->sc_dev);
 168
 169         sc->sc_tty = tp = ttymalloc(sc->sc_tty);
 170         tp->t_oproc = ucomstart;
 171         tp->t_param = ucomparam;
 172         tp->t_stop = ucomstop;
 173
 174         DPRINTF(("ucom_attach: tty_attach tp = %p\n", tp));
 175
 176         DPRINTF(("ucom_attach: make_dev: ucom%d\n", unit));
 177
 178         dev = make_dev(&ucom_ops, unit | UCOM_CALLOUT_MASK,
 179                         UID_UUCP, GID_DIALER, 0660,
 180                         "ucom%d", unit);
 181         dev->si_tty = tp;
 182
 183         return (0);
 184 }
 185
 186 int
 187 ucom_detach(struct ucom_softc *sc)
 188 {
 189         struct tty *tp = sc->sc_tty;
 190         int unit;
 191
 192         DPRINTF(("ucom_detach: sc = %p, tp = %p\n", sc, sc->sc_tty));
 193
 194         sc->sc_dying = 1;
 195
 196         if (sc->sc_bulkin_pipe != NULL)
 197                 usbd_abort_pipe(sc->sc_bulkin_pipe);
 198         if (sc->sc_bulkout_pipe != NULL)
 199                 usbd_abort_pipe(sc->sc_bulkout_pipe);
 200
 201         if (tp != NULL) {
 202                 if (tp->t_state & TS_ISOPEN) {
 203                         device_printf(sc->sc_dev,
 204                                       "still open, forcing close\n");
 205                         (*linesw[tp->t_line].l_close)(tp, 0);
 206                         ttyclose(tp);
 207                 }
 208         } else {
 209                 DPRINTF(("ucom_detach: no tty\n"));
 210                 return (0);
 211         }
 212
 213         crit_enter();
 214         if (--sc->sc_refcnt >= 0) {
 215                 /* Wait for processes to go away. */
 216                 usb_detach_wait(sc->sc_dev);
 217         }
 218         crit_exit();
 219
 220         unit = device_get_unit(sc->sc_dev);
 221         dev_ops_remove_minor(&ucom_ops, /*UCOMUNIT_MASK, */unit);
 222
 223         return (0);
 224 }
 225
 226 static void
 227 ucom_shutdown(struct ucom_softc *sc)
 228 {
 229         struct tty *tp = sc->sc_tty;
 230
 231         DPRINTF(("ucom_shutdown\n"));
 232         /*
 233          * Hang up if necessary.  Wait a bit, so the other side has time to
 234          * notice even if we immediately open the port again.
 235          */
 236         if (ISSET(tp->t_cflag, HUPCL)) {
 237                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 238                 (void)tsleep(sc, 0, "ucomsd", hz);
 239         }
 240 }
 241
 242 static int
 243 ucomopen(struct dev_open_args *ap)
 244 {
 245         cdev_t dev = ap->a_head.a_dev;
 246         int unit = UCOMUNIT(dev);
 247         struct ucom_softc *sc;
 248         usbd_status err;
 249         struct tty *tp;
 250         int error;
 251
 252         sc = devclass_get_softc(ucom_devclass, unit);
 253         if (sc == NULL)
 254                 return (ENXIO);
 255
 256         if (sc->sc_dying)
 257                 return (ENXIO);
 258
 259         tp = sc->sc_tty;
 260
 261         DPRINTF(("%s: ucomopen: tp = %p\n", device_get_nameunit(sc->sc_dev), tp));
 262
 263         if (ISSET(tp->t_state, TS_ISOPEN) &&
 264             ISSET(tp->t_state, TS_XCLUDE) &&
 265             priv_check_cred(ap->a_cred, PRIV_ROOT, 0)
 266         ) {
 267                 return (EBUSY);
 268         }
 269
 270         /*
 271          * Do the following iff this is a first open.
 272          */
 273         crit_enter();
 274         while (sc->sc_opening)
 275                 tsleep(&sc->sc_opening, 0, "ucomop", 0);
 276         sc->sc_opening = 1;
 277
 278         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 279                 struct termios t;
 280
 281                 sc->sc_poll = 0;
 282                 sc->sc_lsr = sc->sc_msr = sc->sc_mcr = 0;
 283
 284                 tp->t_dev = reference_dev(dev);
 285
 286                 /*
 287                  * Initialize the termios status to the defaults.  Add in the
 288                  * sticky bits from TIOCSFLAGS.
 289                  */
 290                 t.c_ispeed = 0;
 291                 t.c_ospeed = TTYDEF_SPEED;
 292                 t.c_cflag = TTYDEF_CFLAG;
 293                 /* Make sure ucomparam() will do something. */
 294                 tp->t_ospeed = 0;
 295                 (void)ucomparam(tp, &t);
 296                 tp->t_iflag = TTYDEF_IFLAG;
 297                 tp->t_oflag = TTYDEF_OFLAG;
 298                 tp->t_lflag = TTYDEF_LFLAG;
 299                 ttychars(tp);
 300                 ttsetwater(tp);
 301
 302                 /*
 303                  * Turn on DTR.  We must always do this, even if carrier is not
 304                  * present, because otherwise we'd have to use TIOCSDTR
 305                  * immediately after setting CLOCAL, which applications do not
 306                  * expect.  We always assert DTR while the device is open
 307                  * unless explicitly requested to deassert it.
 308                  */
 309                 (void)ucomctl(sc, TIOCM_DTR | TIOCM_RTS, DMBIS);
 310
 311                 /* Device specific open */
 312                 if (sc->sc_callback->ucom_open != NULL) {
 313                         error = sc->sc_callback->ucom_open(sc->sc_parent,
 314                                                            sc->sc_portno);
 315                         if (error) {
 316                                 ucom_cleanup(sc);
 317                                 sc->sc_opening = 0;
 318                                 wakeup(&sc->sc_opening);
 319                                 crit_exit();
 320                                 return (error);
 321                         }
 322                 }
 323
 324                 DPRINTF(("ucomopen: open pipes in = %d out = %d\n",
 325                          sc->sc_bulkin_no, sc->sc_bulkout_no));
 326
 327                 /* Open the bulk pipes */
 328                 /* Bulk-in pipe */
 329                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkin_no, 0,
 330                                      &sc->sc_bulkin_pipe);
 331                 if (err) {
 332                         kprintf("%s: open bulk in error (addr %d): %s\n",
 333                                device_get_nameunit(sc->sc_dev), sc->sc_bulkin_no,
 334                                usbd_errstr(err));
 335                         error = EIO;
 336                         goto fail_0;
 337                 }
 338                 /* Bulk-out pipe */
 339                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkout_no,
 340                                      USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
 341                 if (err) {
 342                         kprintf("%s: open bulk out error (addr %d): %s\n",
 343                                device_get_nameunit(sc->sc_dev), sc->sc_bulkout_no,
 344                                usbd_errstr(err));
 345                         error = EIO;
 346                         goto fail_1;
 347                 }
 348
 349                 /* Allocate a request and an input buffer and start reading. */
 350                 sc->sc_ixfer = usbd_alloc_xfer(sc->sc_udev);
 351                 if (sc->sc_ixfer == NULL) {
 352                         error = ENOMEM;
 353                         goto fail_2;
 354                 }
 355
 356                 sc->sc_ibuf = usbd_alloc_buffer(sc->sc_ixfer,
 357                                                 sc->sc_ibufsizepad);
 358                 if (sc->sc_ibuf == NULL) {
 359                         error = ENOMEM;
 360                         goto fail_3;
 361                 }
 362
 363                 sc->sc_oxfer = usbd_alloc_xfer(sc->sc_udev);
 364                 if (sc->sc_oxfer == NULL) {
 365                         error = ENOMEM;
 366                         goto fail_3;
 367                 }
 368
 369                 sc->sc_obuf = usbd_alloc_buffer(sc->sc_oxfer,
 370                                                 sc->sc_obufsize +
 371                                                 sc->sc_opkthdrlen);
 372                 if (sc->sc_obuf == NULL) {
 373                         error = ENOMEM;
 374                         goto fail_4;
 375                 }
 376
 377                 /*
 378                  * Handle initial DCD.
 379                  */
 380                 if (ISSET(sc->sc_msr, UMSR_DCD) ||
 381                     (minor(dev) & UCOM_CALLOUT_MASK))
 382                         (*linesw[tp->t_line].l_modem)(tp, 1);
 383
 384                 ucomstartread(sc);
 385         }
 386
 387         sc->sc_opening = 0;
 388         wakeup(&sc->sc_opening);
 389         crit_exit();
 390
 391         error = ttyopen(dev, tp);
 392         if (error)
 393                 goto bad;
 394
 395         error = (*linesw[tp->t_line].l_open)(dev, tp);
 396         if (error)
 397                 goto bad;
 398
 399         disc_optim(tp, &tp->t_termios, sc);
 400
 401         DPRINTF(("%s: ucomopen: success\n", device_get_nameunit(sc->sc_dev)));
 402
 403         sc->sc_poll = 1;
 404         sc->sc_refcnt++;
 405
 406         return (0);
 407
 408 fail_4:
 409         usbd_free_xfer(sc->sc_oxfer);
 410         sc->sc_oxfer = NULL;
 411 fail_3:
 412         usbd_free_xfer(sc->sc_ixfer);
 413         sc->sc_ixfer = NULL;
 414 fail_2:
 415         usbd_close_pipe(sc->sc_bulkout_pipe);
 416         sc->sc_bulkout_pipe = NULL;
 417 fail_1:
 418         usbd_close_pipe(sc->sc_bulkin_pipe);
 419         sc->sc_bulkin_pipe = NULL;
 420 fail_0:
 421         sc->sc_opening = 0;
 422         wakeup(&sc->sc_opening);
 423         crit_exit();
 424         return (error);
 425
 426 bad:
 427         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 428                 /*
 429                  * We failed to open the device, and nobody else had it opened.
 430                  * Clean up the state as appropriate.
 431                  */
 432                 ucom_cleanup(sc);
 433         }
 434
 435         DPRINTF(("%s: ucomopen: failed\n", device_get_nameunit(sc->sc_dev)));
 436
 437         return (error);
 438 }
 439
 440 static int
 441 ucomclose(struct dev_close_args *ap)
 442 {
 443         cdev_t dev = ap->a_head.a_dev;
 444         struct ucom_softc *sc;
 445         struct tty *tp;
 446
 447         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 448
 449         tp = sc->sc_tty;
 450
 451         DPRINTF(("%s: ucomclose: unit = %d\n",
 452                 device_get_nameunit(sc->sc_dev), UCOMUNIT(dev)));
 453
 454         if (!ISSET(tp->t_state, TS_ISOPEN))
 455                 goto quit;
 456
 457         crit_enter();
 458         (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 459         disc_optim(tp, &tp->t_termios, sc);
 460         ttyclose(tp);
 461         crit_exit();
 462
 463         if (sc->sc_dying)
 464                 goto quit;
 465
 466         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 467                 /*
 468                  * Although we got a last close, the device may still be in
 469                  * use; e.g. if this was the dialout node, and there are still
 470                  * processes waiting for carrier on the non-dialout node.
 471                  */
 472                 ucom_cleanup(sc);
 473         }
 474
 475         if (sc->sc_callback->ucom_close != NULL)
 476                 sc->sc_callback->ucom_close(sc->sc_parent, sc->sc_portno);
 477
 478 quit:
 479         if (tp->t_dev) {
 480                 release_dev(tp->t_dev);
 481                 tp->t_dev = NULL;
 482         }
 483
 484         if (--sc->sc_refcnt < 0)
 485                 usb_detach_wakeup(sc->sc_dev);
 486
 487         return (0);
 488 }
 489
 490 static int
 491 ucomread(struct dev_read_args *ap)
 492 {
 493         cdev_t dev = ap->a_head.a_dev;
 494         struct ucom_softc *sc;
 495         struct tty *tp;
 496         int error;
 497
 498         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 499         tp = sc->sc_tty;
 500
 501         DPRINTF(("ucomread: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 502
 503         if (sc->sc_dying)
 504                 return (EIO);
 505
 506         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 507
 508         DPRINTF(("ucomread: error = %d\n", error));
 509
 510         return (error);
 511 }
 512
 513 static int
 514 ucomwrite(struct dev_write_args *ap)
 515 {
 516         cdev_t dev = ap->a_head.a_dev;
 517         struct ucom_softc *sc;
 518         struct tty *tp;
 519         int error;
 520
 521         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 522         tp = sc->sc_tty;
 523
 524         DPRINTF(("ucomwrite: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 525
 526         if (sc->sc_dying)
 527                 return (EIO);
 528
 529         error = (*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag);
 530
 531         DPRINTF(("ucomwrite: error = %d\n", error));
 532
 533         return (error);
 534 }
 535
 536 static int
 537 ucomioctl(struct dev_ioctl_args *ap)
 538 {
 539         cdev_t dev = ap->a_head.a_dev;
 540         struct ucom_softc *sc;
 541         struct tty *tp;
 542         int error;
 543         int d;
 544
 545         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 546         tp = sc->sc_tty;
 547
 548         if (sc->sc_dying)
 549                 return (EIO);
 550
 551         DPRINTF(("ucomioctl: cmd = 0x%08lx\n", ap->a_cmd));
 552
 553         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 554                                               ap->a_fflag, ap->a_cred);
 555         if (error != ENOIOCTL) {
 556                 DPRINTF(("ucomioctl: l_ioctl: error = %d\n", error));
 557                 return (error);
 558         }
 559
 560         crit_enter();
 561
 562         error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 563         disc_optim(tp, &tp->t_termios, sc);
 564         if (error != ENOIOCTL) {
 565                 crit_exit();
 566                 DPRINTF(("ucomioctl: ttioctl: error = %d\n", error));
 567                 return (error);
 568         }
 569
 570         if (sc->sc_callback->ucom_ioctl != NULL) {
 571                 error = sc->sc_callback->ucom_ioctl(sc->sc_parent,
 572                                                     sc->sc_portno,
 573                                                     ap->a_cmd, ap->a_data,
 574                                                     ap->a_fflag, curthread);
 575                 if (error >= 0) {
 576                         crit_exit();
 577                         return (error);
 578                 }
 579         }
 580
 581         error = 0;
 582
 583         DPRINTF(("ucomioctl: our cmd = 0x%08lx\n", ap->a_cmd));
 584
 585         switch (ap->a_cmd) {
 586         case TIOCSBRK:
 587                 DPRINTF(("ucomioctl: TIOCSBRK\n"));
 588                 ucom_break(sc, 1);
 589                 break;
 590         case TIOCCBRK:
 591                 DPRINTF(("ucomioctl: TIOCCBRK\n"));
 592                 ucom_break(sc, 0);
 593                 break;
 594
 595         case TIOCSDTR:
 596                 DPRINTF(("ucomioctl: TIOCSDTR\n"));
 597                 (void)ucomctl(sc, TIOCM_DTR, DMBIS);
 598                 break;
 599         case TIOCCDTR:
 600                 DPRINTF(("ucomioctl: TIOCCDTR\n"));
 601                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 602                 break;
 603
 604         case TIOCMSET:
 605                 d = *(int *)ap->a_data;
 606                 DPRINTF(("ucomioctl: TIOCMSET, 0x%x\n", d));
 607                 (void)ucomctl(sc, d, DMSET);
 608                 break;
 609         case TIOCMBIS:
 610                 d = *(int *)ap->a_data;
 611                 DPRINTF(("ucomioctl: TIOCMBIS, 0x%x\n", d));
 612                 (void)ucomctl(sc, d, DMBIS);
 613                 break;
 614         case TIOCMBIC:
 615                 d = *(int *)ap->a_data;
 616                 DPRINTF(("ucomioctl: TIOCMBIC, 0x%x\n", d));
 617                 (void)ucomctl(sc, d, DMBIC);
 618                 break;
 619         case TIOCMGET:
 620                 d = ucomctl(sc, 0, DMGET);
 621                 DPRINTF(("ucomioctl: TIOCMGET, 0x%x\n", d));
 622                 *(int *)ap->a_data = d;
 623                 break;
 624
 625         default:
 626                 DPRINTF(("ucomioctl: error: our cmd = 0x%08lx\n", ap->a_cmd));
 627                 error = ENOTTY;
 628                 break;
 629         }
 630
 631         crit_exit();
 632
 633         return (error);
 634 }
 635
 636 static int
 637 ucomctl(struct ucom_softc *sc, int bits, int how)
 638 {
 639         int     mcr;
 640         int     msr;
 641         int     onoff;
 642
 643         DPRINTF(("ucomctl: bits = 0x%x, how = %d\n", bits, how));
 644
 645         if (how == DMGET) {
 646                 SET(bits, TIOCM_LE);            /* always set TIOCM_LE bit */
 647                 DPRINTF(("ucomctl: DMGET: LE"));
 648
 649                 mcr = sc->sc_mcr;
 650                 if (ISSET(mcr, UMCR_DTR)) {
 651                         SET(bits, TIOCM_DTR);
 652                         DPRINTF((" DTR"));
 653                 }
 654                 if (ISSET(mcr, UMCR_RTS)) {
 655                         SET(bits, TIOCM_RTS);
 656                         DPRINTF((" RTS"));
 657                 }
 658
 659                 msr = sc->sc_msr;
 660                 if (ISSET(msr, UMSR_CTS)) {
 661                         SET(bits, TIOCM_CTS);
 662                         DPRINTF((" CTS"));
 663                 }
 664                 if (ISSET(msr, UMSR_DCD)) {
 665                         SET(bits, TIOCM_CD);
 666                         DPRINTF((" CD"));
 667                 }
 668                 if (ISSET(msr, UMSR_DSR)) {
 669                         SET(bits, TIOCM_DSR);
 670                         DPRINTF((" DSR"));
 671                 }
 672                 if (ISSET(msr, UMSR_RI)) {
 673                         SET(bits, TIOCM_RI);
 674                         DPRINTF((" RI"));
 675                 }
 676
 677                 DPRINTF(("\n"));
 678
 679                 return (bits);
 680         }
 681
 682         mcr = 0;
 683         if (ISSET(bits, TIOCM_DTR))
 684                 SET(mcr, UMCR_DTR);
 685         if (ISSET(bits, TIOCM_RTS))
 686                 SET(mcr, UMCR_RTS);
 687
 688         switch (how) {
 689         case DMSET:
 690                 sc->sc_mcr = mcr;
 691                 break;
 692         case DMBIS:
 693                 sc->sc_mcr |= mcr;
 694                 break;
 695         case DMBIC:
 696                 sc->sc_mcr &= ~mcr;
 697                 break;
 698         }
 699
 700         onoff = ISSET(sc->sc_mcr, UMCR_DTR) ? 1 : 0;
 701         ucom_dtr(sc, onoff);
 702
 703         onoff = ISSET(sc->sc_mcr, UMCR_RTS) ? 1 : 0;
 704         ucom_rts(sc, onoff);
 705
 706         return (0);
 707 }
 708
 709 static void
 710 ucom_break(struct ucom_softc *sc, int onoff)
 711 {
 712         DPRINTF(("ucom_break: onoff = %d\n", onoff));
 713
 714         if (sc->sc_callback->ucom_set == NULL)
 715                 return;
 716         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 717                                   UCOM_SET_BREAK, onoff);
 718 }
 719
 720 static void
 721 ucom_dtr(struct ucom_softc *sc, int onoff)
 722 {
 723         DPRINTF(("ucom_dtr: onoff = %d\n", onoff));
 724
 725         if (sc->sc_callback->ucom_set == NULL)
 726                 return;
 727         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 728                                   UCOM_SET_DTR, onoff);
 729 }
 730
 731 static void
 732 ucom_rts(struct ucom_softc *sc, int onoff)
 733 {
 734         DPRINTF(("ucom_rts: onoff = %d\n", onoff));
 735
 736         if (sc->sc_callback->ucom_set == NULL)
 737                 return;
 738         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 739                                   UCOM_SET_RTS, onoff);
 740 }
 741
 742 void
 743 ucom_status_change(struct ucom_softc *sc)
 744 {
 745         struct tty *tp = sc->sc_tty;
 746         u_char old_msr;
 747         int onoff;
 748
 749         if (sc->sc_callback->ucom_get_status == NULL) {
 750                 sc->sc_lsr = 0;
 751                 sc->sc_msr = 0;
 752                 return;
 753         }
 754
 755         old_msr = sc->sc_msr;
 756         sc->sc_callback->ucom_get_status(sc->sc_parent, sc->sc_portno,
 757                                          &sc->sc_lsr, &sc->sc_msr);
 758         if (ISSET((sc->sc_msr ^ old_msr), UMSR_DCD)) {
 759                 if (sc->sc_poll == 0)
 760                         return;
 761                 onoff = ISSET(sc->sc_msr, UMSR_DCD) ? 1 : 0;
 762                 DPRINTF(("ucom_status_change: DCD changed to %d\n", onoff));
 763                 (*linesw[tp->t_line].l_modem)(tp, onoff);
 764         }
 765 }
 766
 767 static int
 768 ucomparam(struct tty *tp, struct termios *t)
 769 {
 770         struct ucom_softc *sc;
 771         int error;
 772         usbd_status uerr;
 773
 774         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 775
 776         if (sc->sc_dying)
 777                 return (EIO);
 778
 779         DPRINTF(("ucomparam: sc = %p\n", sc));
 780
 781         /* Check requested parameters. */
 782         if (t->c_ospeed < 0) {
 783                 DPRINTF(("ucomparam: negative ospeed\n"));
 784                 return (EINVAL);
 785         }
 786         if (t->c_ispeed && t->c_ispeed != t->c_ospeed) {
 787                 DPRINTF(("ucomparam: mismatch ispeed and ospeed\n"));
 788                 return (EINVAL);
 789         }
 790
 791         /*
 792          * If there were no changes, don't do anything.  This avoids dropping
 793          * input and improves performance when all we did was frob things like
 794          * VMIN and VTIME.
 795          */
 796         if (tp->t_ospeed == t->c_ospeed &&
 797             tp->t_cflag == t->c_cflag)
 798                 return (0);
 799
 800         /* And copy to tty. */
 801         tp->t_ispeed = 0;
 802         tp->t_ospeed = t->c_ospeed;
 803         tp->t_cflag = t->c_cflag;
 804
 805         if (sc->sc_callback->ucom_param == NULL)
 806                 return (0);
 807
 808         ucomstopread(sc);
 809
 810         error = sc->sc_callback->ucom_param(sc->sc_parent, sc->sc_portno, t);
 811         if (error) {
 812                 DPRINTF(("ucomparam: callback: error = %d\n", error));
 813                 return (error);
 814         }
 815
 816         ttsetwater(tp);
 817
 818         if (t->c_cflag & CRTS_IFLOW) {
 819                 sc->sc_state |= UCS_RTS_IFLOW;
 820         } else if (sc->sc_state & UCS_RTS_IFLOW) {
 821                 sc->sc_state &= ~UCS_RTS_IFLOW;
 822                 (void)ucomctl(sc, UMCR_RTS, DMBIS);
 823         }
 824
 825         disc_optim(tp, t, sc);
 826
 827         uerr = ucomstartread(sc);
 828         if (uerr != USBD_NORMAL_COMPLETION)
 829                 return (EIO);
 830
 831         return (0);
 832 }
 833
 834 static void
 835 ucomstart(struct tty *tp)
 836 {
 837         struct ucom_softc *sc;
 838         struct cblock *cbp;
 839         usbd_status err;
 840         u_char *data;
 841         int cnt;
 842
 843         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 844         DPRINTF(("ucomstart: sc = %p\n", sc));
 845
 846         if (sc->sc_dying)
 847                 return;
 848
 849         crit_enter();
 850
 851         if (tp->t_state & TS_TBLOCK) {
 852                 if (ISSET(sc->sc_mcr, UMCR_RTS) &&
 853                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 854                         DPRINTF(("ucomstart: clear RTS\n"));
 855                         (void)ucomctl(sc, UMCR_RTS, DMBIC);
 856                 }
 857         } else {
 858                 if (!ISSET(sc->sc_mcr, UMCR_RTS) &&
 859                     tp->t_rawq.c_cc <= tp->t_ilowat &&
 860                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 861                         DPRINTF(("ucomstart: set RTS\n"));
 862                         (void)ucomctl(sc, UMCR_RTS, DMBIS);
 863                 }
 864         }
 865
 866         if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) {
 867                 ttwwakeup(tp);
 868                 DPRINTF(("ucomstart: stopped\n"));
 869                 goto out;
 870         }
 871
 872         if (tp->t_outq.c_cc <= tp->t_olowat) {
 873                 if (ISSET(tp->t_state, TS_SO_OLOWAT)) {
 874                         CLR(tp->t_state, TS_SO_OLOWAT);
 875                         wakeup(TSA_OLOWAT(tp));
 876                 }
 877                 selwakeup(&tp->t_wsel);
 878                 if (tp->t_outq.c_cc == 0) {
 879                         if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
 880                             TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
 881                                 CLR(tp->t_state, TS_SO_OCOMPLETE);
 882                                 wakeup(TSA_OCOMPLETE(tp));
 883                         }
 884                         goto out;
 885                 }
 886         }
 887
 888         /* Grab the first contiguous region of buffer space. */
 889         data = tp->t_outq.c_cf;
 890         cbp = (struct cblock *) ((intptr_t) tp->t_outq.c_cf & ~CROUND);
 891         cnt = min((char *) (cbp+1) - tp->t_outq.c_cf, tp->t_outq.c_cc);
 892
 893         if (cnt == 0) {
 894                 DPRINTF(("ucomstart: cnt == 0\n"));
 895                 goto out;
 896         }
 897
 898         SET(tp->t_state, TS_BUSY);
 899
 900         if (cnt > sc->sc_obufsize) {
 901                 DPRINTF(("ucomstart: big buffer %d chars\n", cnt));
 902                 cnt = sc->sc_obufsize;
 903         }
 904         if (sc->sc_callback->ucom_write != NULL)
 905                 sc->sc_callback->ucom_write(sc->sc_parent, sc->sc_portno,
 906                                             sc->sc_obuf, data, &cnt);
 907         else
 908                 memcpy(sc->sc_obuf, data, cnt);
 909
 910         DPRINTF(("ucomstart: %d chars\n", cnt));
 911         usbd_setup_xfer(sc->sc_oxfer, sc->sc_bulkout_pipe,
 912                         (usbd_private_handle)sc, sc->sc_obuf, cnt,
 913                         USBD_NO_COPY, USBD_NO_TIMEOUT, ucomwritecb);
 914         /* What can we do on error? */
 915         err = usbd_transfer(sc->sc_oxfer);
 916         if (err != USBD_IN_PROGRESS)
 917                 kprintf("ucomstart: err=%s\n", usbd_errstr(err));
 918
 919         ttwwakeup(tp);
 920
 921     out:
 922         crit_exit();
 923 }
 924
 925 static void
 926 ucomstop(struct tty *tp, int flag)
 927 {
 928         struct ucom_softc *sc;
 929
 930         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 931
 932         DPRINTF(("ucomstop: %d\n", flag));
 933
 934         if (flag & FREAD) {
 935                 /*
 936                  * This is just supposed to flush pending receive data,
 937                  * not stop the reception of data entirely!
 938                  */
 939                 DPRINTF(("ucomstop: read\n"));
 940                 ucomstopread(sc);
 941                 ucomstartread(sc);
 942         }
 943
 944         if (flag & FWRITE) {
 945                 DPRINTF(("ucomstop: write\n"));
 946                 crit_enter();
 947                 if (ISSET(tp->t_state, TS_BUSY)) {
 948                         /* XXX do what? */
 949                         if (!ISSET(tp->t_state, TS_TTSTOP))
 950                                 SET(tp->t_state, TS_FLUSH);
 951                 }
 952                 crit_exit();
 953         }
 954
 955         DPRINTF(("ucomstop: done\n"));
 956 }
 957
 958 static void
 959 ucomwritecb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
 960 {
 961         struct ucom_softc *sc = (struct ucom_softc *)p;
 962         struct tty *tp = sc->sc_tty;
 963         u_int32_t cc;
 964
 965         DPRINTF(("ucomwritecb: status = %d\n", status));
 966
 967         if (status == USBD_CANCELLED || sc->sc_dying)
 968                 goto error;
 969
 970         if (status != USBD_NORMAL_COMPLETION) {
 971                 kprintf("%s: ucomwritecb: %s\n",
 972                        device_get_nameunit(sc->sc_dev), usbd_errstr(status));
 973                 if (status == USBD_STALLED)
 974                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
 975                 /*
 976                  * XXX.  We may need a flag to sequence ucomstopread() and
 977                  * ucomstartread() to handle the case where ucomstartread()
 978                  * is called after ucomstopread() but before the request has
 979                  * been properly canceled?
 980                  */
 981                 goto error;
 982         }
 983
 984         usbd_get_xfer_status(xfer, NULL, NULL, &cc, NULL);
 985         DPRINTF(("ucomwritecb: cc = %d\n", cc));
 986         if (cc <= sc->sc_opkthdrlen) {
 987                 kprintf("%s: sent size too small, cc = %d\n",
 988                         device_get_nameunit(sc->sc_dev), cc);
 989                 goto error;
 990         }
 991
 992         /* convert from USB bytes to tty bytes */
 993         cc -= sc->sc_opkthdrlen;
 994
 995         crit_enter();
 996         CLR(tp->t_state, TS_BUSY);
 997         if (ISSET(tp->t_state, TS_FLUSH))
 998                 CLR(tp->t_state, TS_FLUSH);
 999         else
1000                 ndflush(&tp->t_outq, cc);
1001         (*linesw[tp->t_line].l_start)(tp);
1002         crit_exit();
1003
1004         return;
1005
1006   error:
1007         crit_enter();
1008         CLR(tp->t_state, TS_BUSY);
1009         crit_exit();
1010         return;
1011 }
1012
1013 static usbd_status
1014 ucomstartread(struct ucom_softc *sc)
1015 {
1016         usbd_status err;
1017
1018         DPRINTF(("ucomstartread: start\n"));
1019
1020         sc->sc_state &= ~UCS_RXSTOP;
1021
1022         if (sc->sc_bulkin_pipe == NULL)
1023                 return (USBD_NORMAL_COMPLETION);
1024
1025         usbd_setup_xfer(sc->sc_ixfer, sc->sc_bulkin_pipe,
1026                         (usbd_private_handle)sc,
1027                         sc->sc_ibuf, sc->sc_ibufsize,
1028                         USBD_SHORT_XFER_OK | USBD_NO_COPY,
1029                         USBD_NO_TIMEOUT, ucomreadcb);
1030
1031         err = usbd_transfer(sc->sc_ixfer);
1032         if (err != USBD_IN_PROGRESS) {
1033                 DPRINTF(("ucomstartread: err = %s\n", usbd_errstr(err)));
1034                 return (err);
1035         }
1036
1037         return (USBD_NORMAL_COMPLETION);
1038 }
1039
1040 static void
1041 ucomreadcb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1042 {
1043         struct ucom_softc *sc = (struct ucom_softc *)p;
1044         struct tty *tp = sc->sc_tty;
1045         int (*rint) (int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1046         usbd_status err;
1047         u_int32_t cc;
1048         u_char *cp;
1049         int lostcc;
1050
1051         DPRINTF(("ucomreadcb: status = %d\n", status));
1052
1053         if (status != USBD_NORMAL_COMPLETION) {
1054                 if (!(sc->sc_state & UCS_RXSTOP))
1055                         kprintf("%s: ucomreadcb: %s\n",
1056                                device_get_nameunit(sc->sc_dev), usbd_errstr(status));
1057                 if (status == USBD_STALLED)
1058                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1059                 /* XXX we should restart after some delay. */
1060                 return;
1061         }
1062
1063         usbd_get_xfer_status(xfer, NULL, (void **)&cp, &cc, NULL);
1064         DPRINTF(("ucomreadcb: got %d chars, tp = %p\n", cc, tp));
1065         if (cc == 0)
1066                 goto resubmit;
1067
1068         if (sc->sc_callback->ucom_read != NULL) {
1069                 sc->sc_callback->ucom_read(sc->sc_parent, sc->sc_portno,
1070                                            &cp, &cc);
1071         }
1072
1073         if (cc > sc->sc_ibufsize) {
1074                 kprintf("%s: invalid receive data size, %d chars\n",
1075                         device_get_nameunit(sc->sc_dev), cc);
1076                 goto resubmit;
1077         }
1078         if (cc < 1)
1079                 goto resubmit;
1080
1081         crit_enter();
1082         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1083                 if (tp->t_rawq.c_cc + cc > tp->t_ihiwat
1084                     && (sc->sc_state & UCS_RTS_IFLOW
1085                         || tp->t_iflag & IXOFF)
1086                     && !(tp->t_state & TS_TBLOCK))
1087                         ttyblock(tp);
1088                 lostcc = b_to_q((char *)cp, cc, &tp->t_rawq);
1089                 tp->t_rawcc += cc;
1090                 if (sc->hotchar) {
1091                         while (cc) {
1092                                 if (*cp == sc->hotchar)
1093                                         break;
1094                                 --cc;
1095                                 ++cp;
1096                         }
1097                         if (cc)
1098                                 setsofttty();
1099                 }
1100                 ttwakeup(tp);
1101                 if (tp->t_state & TS_TTSTOP
1102                     && (tp->t_iflag & IXANY
1103                         || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1104                         tp->t_state &= ~TS_TTSTOP;
1105                         tp->t_lflag &= ~FLUSHO;
1106                         ucomstart(tp);
1107                 }
1108                 if (lostcc > 0)
1109                         kprintf("%s: lost %d chars\n", device_get_nameunit(sc->sc_dev),
1110                                lostcc);
1111         } else {
1112                 /* Give characters to tty layer. */
1113                 while (cc > 0) {
1114                         DPRINTFN(7, ("ucomreadcb: char = 0x%02x\n", *cp));
1115                         if ((*rint)(*cp, tp) == -1) {
1116                                 /* XXX what should we do? */
1117                                 kprintf("%s: lost %d chars\n",
1118                                        device_get_nameunit(sc->sc_dev), cc);
1119                                 break;
1120                         }
1121                         cc--;
1122                         cp++;
1123                 }
1124         }
1125         crit_exit();
1126
1127 resubmit:
1128         err = ucomstartread(sc);
1129         if (err) {
1130                 kprintf("%s: read start failed\n", device_get_nameunit(sc->sc_dev));
1131                 /* XXX what should we dow now? */
1132         }
1133
1134         if ((sc->sc_state & UCS_RTS_IFLOW) && !ISSET(sc->sc_mcr, UMCR_RTS)
1135             && !(tp->t_state & TS_TBLOCK))
1136                 ucomctl(sc, UMCR_RTS, DMBIS);
1137 }
1138
1139 static void
1140 ucom_cleanup(struct ucom_softc *sc)
1141 {
1142         DPRINTF(("ucom_cleanup: closing pipes\n"));
1143
1144         ucom_shutdown(sc);
1145         if (sc->sc_bulkin_pipe != NULL) {
1146                 usbd_abort_pipe(sc->sc_bulkin_pipe);
1147                 usbd_close_pipe(sc->sc_bulkin_pipe);
1148                 sc->sc_bulkin_pipe = NULL;
1149         }
1150         if (sc->sc_bulkout_pipe != NULL) {
1151                 usbd_abort_pipe(sc->sc_bulkout_pipe);
1152                 usbd_close_pipe(sc->sc_bulkout_pipe);
1153                 sc->sc_bulkout_pipe = NULL;
1154         }
1155         if (sc->sc_ixfer != NULL) {
1156                 usbd_free_xfer(sc->sc_ixfer);
1157                 sc->sc_ixfer = NULL;
1158         }
1159         if (sc->sc_oxfer != NULL) {
1160                 usbd_free_xfer(sc->sc_oxfer);
1161                 sc->sc_oxfer = NULL;
1162         }
1163 }
1164
1165 static void
1166 ucomstopread(struct ucom_softc *sc)
1167 {
1168         usbd_status err;
1169
1170         DPRINTF(("ucomstopread: enter\n"));
1171
1172         if (!(sc->sc_state & UCS_RXSTOP)) {
1173                 sc->sc_state |= UCS_RXSTOP;
1174                 if (sc->sc_bulkin_pipe == NULL) {
1175                         DPRINTF(("ucomstopread: bulkin pipe NULL\n"));
1176                         return;
1177                 }
1178                 err = usbd_abort_pipe(sc->sc_bulkin_pipe);
1179                 if (err) {
1180                         DPRINTF(("ucomstopread: err = %s\n",
1181                                  usbd_errstr(err)));
1182                 }
1183         }
1184
1185         DPRINTF(("ucomstopread: leave\n"));
1186 }
1187
1188 static void
1189 disc_optim(struct tty *tp, struct termios *t, struct ucom_softc *sc)
1190 {
1191         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
1192             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
1193             && (!(t->c_iflag & PARMRK)
1194                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
1195             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
1196             && linesw[tp->t_line].l_rint == ttyinput) {
1197                 DPRINTF(("disc_optim: bypass l_rint\n"));
1198                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
1199         } else {
1200                 DPRINTF(("disc_optim: can't bypass l_rint\n"));
1201                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
1202         }
1203         sc->hotchar = linesw[tp->t_line].l_hotchar;
1204 }