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 1.31 2007/08/07 13:14:11 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/ioccom.h>
  76 #include <sys/fcntl.h>
  77 #include <sys/conf.h>
  78 #include <sys/tty.h>
  79 #include <sys/clist.h>
  80 #include <sys/file.h>
  81 #include <sys/select.h>
  82 #include <sys/proc.h>
  83 #include <sys/poll.h>
  84 #include <sys/sysctl.h>
  85 #include <sys/thread2.h>
  86
  87 #include <bus/usb/usb.h>
  88 #include <bus/usb/usbcdc.h>
  89
  90 #include <bus/usb/usbdi.h>
  91 #include <bus/usb/usbdi_util.h>
  92 #include <bus/usb/usbdevs.h>
  93 #include <bus/usb/usb_quirks.h>
  94
  95 #include "ucomvar.h"
  96
  97 #ifdef USB_DEBUG
  98 static int      ucomdebug = 0;
  99 SYSCTL_NODE(_hw_usb, OID_AUTO, ucom, CTLFLAG_RW, 0, "USB ucom");
 100 SYSCTL_INT(_hw_usb_ucom, OID_AUTO, debug, CTLFLAG_RW,
 101            &ucomdebug, 0, "ucom debug level");
 102 #define DPRINTF(x)      do { \
 103                                 if (ucomdebug) \
 104                                         kprintf x; \
 105                         } while (0)
 106
 107 #define DPRINTFN(n, x)  do { \
 108                                 if (ucomdebug > (n)) \
 109                                         kprintf x; \
 110                         } while (0)
 111 #else
 112 #define DPRINTF(x)
 113 #define DPRINTFN(n, x)
 114 #endif
 115
 116 static d_open_t  ucomopen;
 117 static d_close_t ucomclose;
 118 static d_read_t  ucomread;
 119 static d_write_t ucomwrite;
 120 static d_ioctl_t ucomioctl;
 121
 122 #define UCOM_CDEV_MAJOR  138
 123
 124 static struct dev_ops ucom_ops = {
 125         { "ucom", UCOM_CDEV_MAJOR, D_TTY | D_KQFILTER },
 126         .d_open =       ucomopen,
 127         .d_close =      ucomclose,
 128         .d_read =       ucomread,
 129         .d_write =      ucomwrite,
 130         .d_ioctl =      ucomioctl,
 131         .d_poll =       ttypoll,
 132         .d_kqfilter =   ttykqfilter
 133 };
 134
 135 static void ucom_cleanup(struct ucom_softc *);
 136 static int ucomctl(struct ucom_softc *, int, int);
 137 static int ucomparam(struct tty *, struct termios *);
 138 static void ucomstart(struct tty *);
 139 static void ucomstop(struct tty *, int);
 140 static void ucom_shutdown(struct ucom_softc *);
 141 static void ucom_dtr(struct ucom_softc *, int);
 142 static void ucom_rts(struct ucom_softc *, int);
 143 static void ucom_break(struct ucom_softc *, int);
 144 static usbd_status ucomstartread(struct ucom_softc *);
 145 static void ucomreadcb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 146 static void ucomwritecb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 147 static void ucomstopread(struct ucom_softc *);
 148 static void disc_optim(struct tty *, struct termios *, struct ucom_softc *);
 149
 150 devclass_t ucom_devclass;
 151
 152 static moduledata_t ucom_mod = {
 153         "ucom",
 154         NULL,
 155         NULL
 156 };
 157
 158 DECLARE_MODULE(ucom, ucom_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
 159 MODULE_DEPEND(ucom, usb, 1, 1, 1);
 160 MODULE_VERSION(ucom, UCOM_MODVER);
 161
 162 int
 163 ucom_attach(struct ucom_softc *sc)
 164 {
 165         struct tty *tp;
 166         int unit;
 167         cdev_t dev;
 168
 169         unit = device_get_unit(sc->sc_dev);
 170
 171         sc->sc_tty = tp = ttymalloc(sc->sc_tty);
 172         tp->t_oproc = ucomstart;
 173         tp->t_param = ucomparam;
 174         tp->t_stop = ucomstop;
 175
 176         DPRINTF(("ucom_attach: tty_attach tp = %p\n", tp));
 177
 178         DPRINTF(("ucom_attach: make_dev: ucom%d\n", unit));
 179
 180         dev_ops_add(&ucom_ops, UCOMUNIT_MASK, unit);
 181         dev = make_dev(&ucom_ops, unit | UCOM_CALLOUT_MASK,
 182                         UID_UUCP, GID_DIALER, 0660,
 183                         "ucom%d", unit);
 184         dev->si_tty = tp;
 185
 186         return (0);
 187 }
 188
 189 int
 190 ucom_detach(struct ucom_softc *sc)
 191 {
 192         struct tty *tp = sc->sc_tty;
 193         int unit;
 194
 195         DPRINTF(("ucom_detach: sc = %p, tp = %p\n", sc, sc->sc_tty));
 196
 197         sc->sc_dying = 1;
 198
 199         if (sc->sc_bulkin_pipe != NULL)
 200                 usbd_abort_pipe(sc->sc_bulkin_pipe);
 201         if (sc->sc_bulkout_pipe != NULL)
 202                 usbd_abort_pipe(sc->sc_bulkout_pipe);
 203
 204         if (tp != NULL) {
 205                 if (tp->t_state & TS_ISOPEN) {
 206                         device_printf(sc->sc_dev,
 207                                       "still open, forcing close\n");
 208                         (*linesw[tp->t_line].l_close)(tp, 0);
 209                         ttyclose(tp);
 210                 }
 211         } else {
 212                 DPRINTF(("ucom_detach: no tty\n"));
 213                 return (0);
 214         }
 215
 216         crit_enter();
 217         if (--sc->sc_refcnt >= 0) {
 218                 /* Wait for processes to go away. */
 219                 usb_detach_wait(sc->sc_dev);
 220         }
 221         crit_exit();
 222
 223         unit = device_get_unit(sc->sc_dev);
 224         dev_ops_remove(&ucom_ops, UCOMUNIT_MASK, unit);
 225
 226         return (0);
 227 }
 228
 229 static void
 230 ucom_shutdown(struct ucom_softc *sc)
 231 {
 232         struct tty *tp = sc->sc_tty;
 233
 234         DPRINTF(("ucom_shutdown\n"));
 235         /*
 236          * Hang up if necessary.  Wait a bit, so the other side has time to
 237          * notice even if we immediately open the port again.
 238          */
 239         if (ISSET(tp->t_cflag, HUPCL)) {
 240                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 241                 (void)tsleep(sc, 0, "ucomsd", hz);
 242         }
 243 }
 244
 245 static int
 246 ucomopen(struct dev_open_args *ap)
 247 {
 248         cdev_t dev = ap->a_head.a_dev;
 249         int unit = UCOMUNIT(dev);
 250         struct ucom_softc *sc;
 251         usbd_status err;
 252         struct tty *tp;
 253         int error;
 254
 255         sc = devclass_get_softc(ucom_devclass, unit);
 256         if (sc == NULL)
 257                 return (ENXIO);
 258
 259         if (sc->sc_dying)
 260                 return (ENXIO);
 261
 262         tp = sc->sc_tty;
 263
 264         DPRINTF(("%s: ucomopen: tp = %p\n", device_get_nameunit(sc->sc_dev), tp));
 265
 266         if (ISSET(tp->t_state, TS_ISOPEN) &&
 267             ISSET(tp->t_state, TS_XCLUDE) &&
 268             suser_cred(ap->a_cred, 0)
 269         ) {
 270                 return (EBUSY);
 271         }
 272
 273         /*
 274          * Do the following iff this is a first open.
 275          */
 276         crit_enter();
 277         while (sc->sc_opening)
 278                 tsleep(&sc->sc_opening, 0, "ucomop", 0);
 279         sc->sc_opening = 1;
 280
 281         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 282                 struct termios t;
 283
 284                 sc->sc_poll = 0;
 285                 sc->sc_lsr = sc->sc_msr = sc->sc_mcr = 0;
 286
 287                 tp->t_dev = reference_dev(dev);
 288
 289                 /*
 290                  * Initialize the termios status to the defaults.  Add in the
 291                  * sticky bits from TIOCSFLAGS.
 292                  */
 293                 t.c_ispeed = 0;
 294                 t.c_ospeed = TTYDEF_SPEED;
 295                 t.c_cflag = TTYDEF_CFLAG;
 296                 /* Make sure ucomparam() will do something. */
 297                 tp->t_ospeed = 0;
 298                 (void)ucomparam(tp, &t);
 299                 tp->t_iflag = TTYDEF_IFLAG;
 300                 tp->t_oflag = TTYDEF_OFLAG;
 301                 tp->t_lflag = TTYDEF_LFLAG;
 302                 ttychars(tp);
 303                 ttsetwater(tp);
 304
 305                 /*
 306                  * Turn on DTR.  We must always do this, even if carrier is not
 307                  * present, because otherwise we'd have to use TIOCSDTR
 308                  * immediately after setting CLOCAL, which applications do not
 309                  * expect.  We always assert DTR while the device is open
 310                  * unless explicitly requested to deassert it.
 311                  */
 312                 (void)ucomctl(sc, TIOCM_DTR | TIOCM_RTS, DMBIS);
 313
 314                 /* Device specific open */
 315                 if (sc->sc_callback->ucom_open != NULL) {
 316                         error = sc->sc_callback->ucom_open(sc->sc_parent,
 317                                                            sc->sc_portno);
 318                         if (error) {
 319                                 ucom_cleanup(sc);
 320                                 sc->sc_opening = 0;
 321                                 wakeup(&sc->sc_opening);
 322                                 crit_exit();
 323                                 return (error);
 324                         }
 325                 }
 326
 327                 DPRINTF(("ucomopen: open pipes in = %d out = %d\n",
 328                          sc->sc_bulkin_no, sc->sc_bulkout_no));
 329
 330                 /* Open the bulk pipes */
 331                 /* Bulk-in pipe */
 332                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkin_no, 0,
 333                                      &sc->sc_bulkin_pipe);
 334                 if (err) {
 335                         kprintf("%s: open bulk in error (addr %d): %s\n",
 336                                device_get_nameunit(sc->sc_dev), sc->sc_bulkin_no,
 337                                usbd_errstr(err));
 338                         error = EIO;
 339                         goto fail_0;
 340                 }
 341                 /* Bulk-out pipe */
 342                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkout_no,
 343                                      USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
 344                 if (err) {
 345                         kprintf("%s: open bulk out error (addr %d): %s\n",
 346                                device_get_nameunit(sc->sc_dev), sc->sc_bulkout_no,
 347                                usbd_errstr(err));
 348                         error = EIO;
 349                         goto fail_1;
 350                 }
 351
 352                 /* Allocate a request and an input buffer and start reading. */
 353                 sc->sc_ixfer = usbd_alloc_xfer(sc->sc_udev);
 354                 if (sc->sc_ixfer == NULL) {
 355                         error = ENOMEM;
 356                         goto fail_2;
 357                 }
 358
 359                 sc->sc_ibuf = usbd_alloc_buffer(sc->sc_ixfer,
 360                                                 sc->sc_ibufsizepad);
 361                 if (sc->sc_ibuf == NULL) {
 362                         error = ENOMEM;
 363                         goto fail_3;
 364                 }
 365
 366                 sc->sc_oxfer = usbd_alloc_xfer(sc->sc_udev);
 367                 if (sc->sc_oxfer == NULL) {
 368                         error = ENOMEM;
 369                         goto fail_3;
 370                 }
 371
 372                 sc->sc_obuf = usbd_alloc_buffer(sc->sc_oxfer,
 373                                                 sc->sc_obufsize +
 374                                                 sc->sc_opkthdrlen);
 375                 if (sc->sc_obuf == NULL) {
 376                         error = ENOMEM;
 377                         goto fail_4;
 378                 }
 379
 380                 /*
 381                  * Handle initial DCD.
 382                  */
 383                 if (ISSET(sc->sc_msr, UMSR_DCD) ||
 384                     (minor(dev) & UCOM_CALLOUT_MASK))
 385                         (*linesw[tp->t_line].l_modem)(tp, 1);
 386
 387                 ucomstartread(sc);
 388         }
 389
 390         sc->sc_opening = 0;
 391         wakeup(&sc->sc_opening);
 392         crit_exit();
 393
 394         error = ttyopen(dev, tp);
 395         if (error)
 396                 goto bad;
 397
 398         error = (*linesw[tp->t_line].l_open)(dev, tp);
 399         if (error)
 400                 goto bad;
 401
 402         disc_optim(tp, &tp->t_termios, sc);
 403
 404         DPRINTF(("%s: ucomopen: success\n", device_get_nameunit(sc->sc_dev)));
 405
 406         sc->sc_poll = 1;
 407         sc->sc_refcnt++;
 408
 409         return (0);
 410
 411 fail_4:
 412         usbd_free_xfer(sc->sc_oxfer);
 413         sc->sc_oxfer = NULL;
 414 fail_3:
 415         usbd_free_xfer(sc->sc_ixfer);
 416         sc->sc_ixfer = NULL;
 417 fail_2:
 418         usbd_close_pipe(sc->sc_bulkout_pipe);
 419         sc->sc_bulkout_pipe = NULL;
 420 fail_1:
 421         usbd_close_pipe(sc->sc_bulkin_pipe);
 422         sc->sc_bulkin_pipe = NULL;
 423 fail_0:
 424         sc->sc_opening = 0;
 425         wakeup(&sc->sc_opening);
 426         crit_exit();
 427         return (error);
 428
 429 bad:
 430         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 431                 /*
 432                  * We failed to open the device, and nobody else had it opened.
 433                  * Clean up the state as appropriate.
 434                  */
 435                 ucom_cleanup(sc);
 436         }
 437
 438         DPRINTF(("%s: ucomopen: failed\n", device_get_nameunit(sc->sc_dev)));
 439
 440         return (error);
 441 }
 442
 443 static int
 444 ucomclose(struct dev_close_args *ap)
 445 {
 446         cdev_t dev = ap->a_head.a_dev;
 447         struct ucom_softc *sc;
 448         struct tty *tp;
 449
 450         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 451
 452         tp = sc->sc_tty;
 453
 454         DPRINTF(("%s: ucomclose: unit = %d\n",
 455                 device_get_nameunit(sc->sc_dev), UCOMUNIT(dev)));
 456
 457         if (!ISSET(tp->t_state, TS_ISOPEN))
 458                 goto quit;
 459
 460         crit_enter();
 461         (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 462         disc_optim(tp, &tp->t_termios, sc);
 463         ttyclose(tp);
 464         crit_exit();
 465
 466         if (sc->sc_dying)
 467                 goto quit;
 468
 469         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 470                 /*
 471                  * Although we got a last close, the device may still be in
 472                  * use; e.g. if this was the dialout node, and there are still
 473                  * processes waiting for carrier on the non-dialout node.
 474                  */
 475                 ucom_cleanup(sc);
 476         }
 477
 478         if (sc->sc_callback->ucom_close != NULL)
 479                 sc->sc_callback->ucom_close(sc->sc_parent, sc->sc_portno);
 480
 481 quit:
 482         if (tp->t_dev) {
 483                 release_dev(tp->t_dev);
 484                 tp->t_dev = NULL;
 485         }
 486
 487         if (--sc->sc_refcnt < 0)
 488                 usb_detach_wakeup(sc->sc_dev);
 489
 490         return (0);
 491 }
 492
 493 static int
 494 ucomread(struct dev_read_args *ap)
 495 {
 496         cdev_t dev = ap->a_head.a_dev;
 497         struct ucom_softc *sc;
 498         struct tty *tp;
 499         int error;
 500
 501         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 502         tp = sc->sc_tty;
 503
 504         DPRINTF(("ucomread: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 505
 506         if (sc->sc_dying)
 507                 return (EIO);
 508
 509         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 510
 511         DPRINTF(("ucomread: error = %d\n", error));
 512
 513         return (error);
 514 }
 515
 516 static int
 517 ucomwrite(struct dev_write_args *ap)
 518 {
 519         cdev_t dev = ap->a_head.a_dev;
 520         struct ucom_softc *sc;
 521         struct tty *tp;
 522         int error;
 523
 524         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 525         tp = sc->sc_tty;
 526
 527         DPRINTF(("ucomwrite: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 528
 529         if (sc->sc_dying)
 530                 return (EIO);
 531
 532         error = (*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag);
 533
 534         DPRINTF(("ucomwrite: error = %d\n", error));
 535
 536         return (error);
 537 }
 538
 539 static int
 540 ucomioctl(struct dev_ioctl_args *ap)
 541 {
 542         cdev_t dev = ap->a_head.a_dev;
 543         struct ucom_softc *sc;
 544         struct tty *tp;
 545         int error;
 546         int d;
 547
 548         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 549         tp = sc->sc_tty;
 550
 551         if (sc->sc_dying)
 552                 return (EIO);
 553
 554         DPRINTF(("ucomioctl: cmd = 0x%08lx\n", ap->a_cmd));
 555
 556         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 557                                               ap->a_fflag, ap->a_cred);
 558         if (error != ENOIOCTL) {
 559                 DPRINTF(("ucomioctl: l_ioctl: error = %d\n", error));
 560                 return (error);
 561         }
 562
 563         crit_enter();
 564
 565         error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 566         disc_optim(tp, &tp->t_termios, sc);
 567         if (error != ENOIOCTL) {
 568                 crit_exit();
 569                 DPRINTF(("ucomioctl: ttioctl: error = %d\n", error));
 570                 return (error);
 571         }
 572
 573         if (sc->sc_callback->ucom_ioctl != NULL) {
 574                 error = sc->sc_callback->ucom_ioctl(sc->sc_parent,
 575                                                     sc->sc_portno,
 576                                                     ap->a_cmd, ap->a_data,
 577                                                     ap->a_fflag, curthread);
 578                 if (error >= 0) {
 579                         crit_exit();
 580                         return (error);
 581                 }
 582         }
 583
 584         error = 0;
 585
 586         DPRINTF(("ucomioctl: our cmd = 0x%08lx\n", ap->a_cmd));
 587
 588         switch (ap->a_cmd) {
 589         case TIOCSBRK:
 590                 DPRINTF(("ucomioctl: TIOCSBRK\n"));
 591                 ucom_break(sc, 1);
 592                 break;
 593         case TIOCCBRK:
 594                 DPRINTF(("ucomioctl: TIOCCBRK\n"));
 595                 ucom_break(sc, 0);
 596                 break;
 597
 598         case TIOCSDTR:
 599                 DPRINTF(("ucomioctl: TIOCSDTR\n"));
 600                 (void)ucomctl(sc, TIOCM_DTR, DMBIS);
 601                 break;
 602         case TIOCCDTR:
 603                 DPRINTF(("ucomioctl: TIOCCDTR\n"));
 604                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 605                 break;
 606
 607         case TIOCMSET:
 608                 d = *(int *)ap->a_data;
 609                 DPRINTF(("ucomioctl: TIOCMSET, 0x%x\n", d));
 610                 (void)ucomctl(sc, d, DMSET);
 611                 break;
 612         case TIOCMBIS:
 613                 d = *(int *)ap->a_data;
 614                 DPRINTF(("ucomioctl: TIOCMBIS, 0x%x\n", d));
 615                 (void)ucomctl(sc, d, DMBIS);
 616                 break;
 617         case TIOCMBIC:
 618                 d = *(int *)ap->a_data;
 619                 DPRINTF(("ucomioctl: TIOCMBIC, 0x%x\n", d));
 620                 (void)ucomctl(sc, d, DMBIC);
 621                 break;
 622         case TIOCMGET:
 623                 d = ucomctl(sc, 0, DMGET);
 624                 DPRINTF(("ucomioctl: TIOCMGET, 0x%x\n", d));
 625                 *(int *)ap->a_data = d;
 626                 break;
 627
 628         default:
 629                 DPRINTF(("ucomioctl: error: our cmd = 0x%08lx\n", ap->a_cmd));
 630                 error = ENOTTY;
 631                 break;
 632         }
 633
 634         crit_exit();
 635
 636         return (error);
 637 }
 638
 639 static int
 640 ucomctl(struct ucom_softc *sc, int bits, int how)
 641 {
 642         int     mcr;
 643         int     msr;
 644         int     onoff;
 645
 646         DPRINTF(("ucomctl: bits = 0x%x, how = %d\n", bits, how));
 647
 648         if (how == DMGET) {
 649                 SET(bits, TIOCM_LE);            /* always set TIOCM_LE bit */
 650                 DPRINTF(("ucomctl: DMGET: LE"));
 651
 652                 mcr = sc->sc_mcr;
 653                 if (ISSET(mcr, UMCR_DTR)) {
 654                         SET(bits, TIOCM_DTR);
 655                         DPRINTF((" DTR"));
 656                 }
 657                 if (ISSET(mcr, UMCR_RTS)) {
 658                         SET(bits, TIOCM_RTS);
 659                         DPRINTF((" RTS"));
 660                 }
 661
 662                 msr = sc->sc_msr;
 663                 if (ISSET(msr, UMSR_CTS)) {
 664                         SET(bits, TIOCM_CTS);
 665                         DPRINTF((" CTS"));
 666                 }
 667                 if (ISSET(msr, UMSR_DCD)) {
 668                         SET(bits, TIOCM_CD);
 669                         DPRINTF((" CD"));
 670                 }
 671                 if (ISSET(msr, UMSR_DSR)) {
 672                         SET(bits, TIOCM_DSR);
 673                         DPRINTF((" DSR"));
 674                 }
 675                 if (ISSET(msr, UMSR_RI)) {
 676                         SET(bits, TIOCM_RI);
 677                         DPRINTF((" RI"));
 678                 }
 679
 680                 DPRINTF(("\n"));
 681
 682                 return (bits);
 683         }
 684
 685         mcr = 0;
 686         if (ISSET(bits, TIOCM_DTR))
 687                 SET(mcr, UMCR_DTR);
 688         if (ISSET(bits, TIOCM_RTS))
 689                 SET(mcr, UMCR_RTS);
 690
 691         switch (how) {
 692         case DMSET:
 693                 sc->sc_mcr = mcr;
 694                 break;
 695         case DMBIS:
 696                 sc->sc_mcr |= mcr;
 697                 break;
 698         case DMBIC:
 699                 sc->sc_mcr &= ~mcr;
 700                 break;
 701         }
 702
 703         onoff = ISSET(sc->sc_mcr, UMCR_DTR) ? 1 : 0;
 704         ucom_dtr(sc, onoff);
 705
 706         onoff = ISSET(sc->sc_mcr, UMCR_RTS) ? 1 : 0;
 707         ucom_rts(sc, onoff);
 708
 709         return (0);
 710 }
 711
 712 static void
 713 ucom_break(struct ucom_softc *sc, int onoff)
 714 {
 715         DPRINTF(("ucom_break: onoff = %d\n", onoff));
 716
 717         if (sc->sc_callback->ucom_set == NULL)
 718                 return;
 719         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 720                                   UCOM_SET_BREAK, onoff);
 721 }
 722
 723 static void
 724 ucom_dtr(struct ucom_softc *sc, int onoff)
 725 {
 726         DPRINTF(("ucom_dtr: onoff = %d\n", onoff));
 727
 728         if (sc->sc_callback->ucom_set == NULL)
 729                 return;
 730         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 731                                   UCOM_SET_DTR, onoff);
 732 }
 733
 734 static void
 735 ucom_rts(struct ucom_softc *sc, int onoff)
 736 {
 737         DPRINTF(("ucom_rts: onoff = %d\n", onoff));
 738
 739         if (sc->sc_callback->ucom_set == NULL)
 740                 return;
 741         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 742                                   UCOM_SET_RTS, onoff);
 743 }
 744
 745 void
 746 ucom_status_change(struct ucom_softc *sc)
 747 {
 748         struct tty *tp = sc->sc_tty;
 749         u_char old_msr;
 750         int onoff;
 751
 752         if (sc->sc_callback->ucom_get_status == NULL) {
 753                 sc->sc_lsr = 0;
 754                 sc->sc_msr = 0;
 755                 return;
 756         }
 757
 758         old_msr = sc->sc_msr;
 759         sc->sc_callback->ucom_get_status(sc->sc_parent, sc->sc_portno,
 760                                          &sc->sc_lsr, &sc->sc_msr);
 761         if (ISSET((sc->sc_msr ^ old_msr), UMSR_DCD)) {
 762                 if (sc->sc_poll == 0)
 763                         return;
 764                 onoff = ISSET(sc->sc_msr, UMSR_DCD) ? 1 : 0;
 765                 DPRINTF(("ucom_status_change: DCD changed to %d\n", onoff));
 766                 (*linesw[tp->t_line].l_modem)(tp, onoff);
 767         }
 768 }
 769
 770 static int
 771 ucomparam(struct tty *tp, struct termios *t)
 772 {
 773         struct ucom_softc *sc;
 774         int error;
 775         usbd_status uerr;
 776
 777         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 778
 779         if (sc->sc_dying)
 780                 return (EIO);
 781
 782         DPRINTF(("ucomparam: sc = %p\n", sc));
 783
 784         /* Check requested parameters. */
 785         if (t->c_ospeed < 0) {
 786                 DPRINTF(("ucomparam: negative ospeed\n"));
 787                 return (EINVAL);
 788         }
 789         if (t->c_ispeed && t->c_ispeed != t->c_ospeed) {
 790                 DPRINTF(("ucomparam: mismatch ispeed and ospeed\n"));
 791                 return (EINVAL);
 792         }
 793
 794         /*
 795          * If there were no changes, don't do anything.  This avoids dropping
 796          * input and improves performance when all we did was frob things like
 797          * VMIN and VTIME.
 798          */
 799         if (tp->t_ospeed == t->c_ospeed &&
 800             tp->t_cflag == t->c_cflag)
 801                 return (0);
 802
 803         /* And copy to tty. */
 804         tp->t_ispeed = 0;
 805         tp->t_ospeed = t->c_ospeed;
 806         tp->t_cflag = t->c_cflag;
 807
 808         if (sc->sc_callback->ucom_param == NULL)
 809                 return (0);
 810
 811         ucomstopread(sc);
 812
 813         error = sc->sc_callback->ucom_param(sc->sc_parent, sc->sc_portno, t);
 814         if (error) {
 815                 DPRINTF(("ucomparam: callback: error = %d\n", error));
 816                 return (error);
 817         }
 818
 819         ttsetwater(tp);
 820
 821         if (t->c_cflag & CRTS_IFLOW) {
 822                 sc->sc_state |= UCS_RTS_IFLOW;
 823         } else if (sc->sc_state & UCS_RTS_IFLOW) {
 824                 sc->sc_state &= ~UCS_RTS_IFLOW;
 825                 (void)ucomctl(sc, UMCR_RTS, DMBIS);
 826         }
 827
 828         disc_optim(tp, t, sc);
 829
 830         uerr = ucomstartread(sc);
 831         if (uerr != USBD_NORMAL_COMPLETION)
 832                 return (EIO);
 833
 834         return (0);
 835 }
 836
 837 static void
 838 ucomstart(struct tty *tp)
 839 {
 840         struct ucom_softc *sc;
 841         struct cblock *cbp;
 842         usbd_status err;
 843         u_char *data;
 844         int cnt;
 845
 846         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 847         DPRINTF(("ucomstart: sc = %p\n", sc));
 848
 849         if (sc->sc_dying)
 850                 return;
 851
 852         crit_enter();
 853
 854         if (tp->t_state & TS_TBLOCK) {
 855                 if (ISSET(sc->sc_mcr, UMCR_RTS) &&
 856                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 857                         DPRINTF(("ucomstart: clear RTS\n"));
 858                         (void)ucomctl(sc, UMCR_RTS, DMBIC);
 859                 }
 860         } else {
 861                 if (!ISSET(sc->sc_mcr, UMCR_RTS) &&
 862                     tp->t_rawq.c_cc <= tp->t_ilowat &&
 863                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 864                         DPRINTF(("ucomstart: set RTS\n"));
 865                         (void)ucomctl(sc, UMCR_RTS, DMBIS);
 866                 }
 867         }
 868
 869         if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) {
 870                 ttwwakeup(tp);
 871                 DPRINTF(("ucomstart: stopped\n"));
 872                 goto out;
 873         }
 874
 875         if (tp->t_outq.c_cc <= tp->t_olowat) {
 876                 if (ISSET(tp->t_state, TS_SO_OLOWAT)) {
 877                         CLR(tp->t_state, TS_SO_OLOWAT);
 878                         wakeup(TSA_OLOWAT(tp));
 879                 }
 880                 selwakeup(&tp->t_wsel);
 881                 if (tp->t_outq.c_cc == 0) {
 882                         if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
 883                             TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
 884                                 CLR(tp->t_state, TS_SO_OCOMPLETE);
 885                                 wakeup(TSA_OCOMPLETE(tp));
 886                         }
 887                         goto out;
 888                 }
 889         }
 890
 891         /* Grab the first contiguous region of buffer space. */
 892         data = tp->t_outq.c_cf;
 893         cbp = (struct cblock *) ((intptr_t) tp->t_outq.c_cf & ~CROUND);
 894         cnt = min((char *) (cbp+1) - tp->t_outq.c_cf, tp->t_outq.c_cc);
 895
 896         if (cnt == 0) {
 897                 DPRINTF(("ucomstart: cnt == 0\n"));
 898                 goto out;
 899         }
 900
 901         SET(tp->t_state, TS_BUSY);
 902
 903         if (cnt > sc->sc_obufsize) {
 904                 DPRINTF(("ucomstart: big buffer %d chars\n", cnt));
 905                 cnt = sc->sc_obufsize;
 906         }
 907         if (sc->sc_callback->ucom_write != NULL)
 908                 sc->sc_callback->ucom_write(sc->sc_parent, sc->sc_portno,
 909                                             sc->sc_obuf, data, &cnt);
 910         else
 911                 memcpy(sc->sc_obuf, data, cnt);
 912
 913         DPRINTF(("ucomstart: %d chars\n", cnt));
 914         usbd_setup_xfer(sc->sc_oxfer, sc->sc_bulkout_pipe,
 915                         (usbd_private_handle)sc, sc->sc_obuf, cnt,
 916                         USBD_NO_COPY, USBD_NO_TIMEOUT, ucomwritecb);
 917         /* What can we do on error? */
 918         err = usbd_transfer(sc->sc_oxfer);
 919         if (err != USBD_IN_PROGRESS)
 920                 kprintf("ucomstart: err=%s\n", usbd_errstr(err));
 921
 922         ttwwakeup(tp);
 923
 924     out:
 925         crit_exit();
 926 }
 927
 928 static void
 929 ucomstop(struct tty *tp, int flag)
 930 {
 931         struct ucom_softc *sc;
 932
 933         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 934
 935         DPRINTF(("ucomstop: %d\n", flag));
 936
 937         if (flag & FREAD) {
 938                 /*
 939                  * This is just supposed to flush pending receive data,
 940                  * not stop the reception of data entirely!
 941                  */
 942                 DPRINTF(("ucomstop: read\n"));
 943                 ucomstopread(sc);
 944                 ucomstartread(sc);
 945         }
 946
 947         if (flag & FWRITE) {
 948                 DPRINTF(("ucomstop: write\n"));
 949                 crit_enter();
 950                 if (ISSET(tp->t_state, TS_BUSY)) {
 951                         /* XXX do what? */
 952                         if (!ISSET(tp->t_state, TS_TTSTOP))
 953                                 SET(tp->t_state, TS_FLUSH);
 954                 }
 955                 crit_exit();
 956         }
 957
 958         DPRINTF(("ucomstop: done\n"));
 959 }
 960
 961 static void
 962 ucomwritecb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
 963 {
 964         struct ucom_softc *sc = (struct ucom_softc *)p;
 965         struct tty *tp = sc->sc_tty;
 966         u_int32_t cc;
 967
 968         DPRINTF(("ucomwritecb: status = %d\n", status));
 969
 970         if (status == USBD_CANCELLED || sc->sc_dying)
 971                 goto error;
 972
 973         if (status != USBD_NORMAL_COMPLETION) {
 974                 kprintf("%s: ucomwritecb: %s\n",
 975                        device_get_nameunit(sc->sc_dev), usbd_errstr(status));
 976                 if (status == USBD_STALLED)
 977                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
 978                 /*
 979                  * XXX.  We may need a flag to sequence ucomstopread() and
 980                  * ucomstartread() to handle the case where ucomstartread()
 981                  * is called after ucomstopread() but before the request has
 982                  * been properly canceled?
 983                  */
 984                 goto error;
 985         }
 986
 987         usbd_get_xfer_status(xfer, NULL, NULL, &cc, NULL);
 988         DPRINTF(("ucomwritecb: cc = %d\n", cc));
 989         if (cc <= sc->sc_opkthdrlen) {
 990                 kprintf("%s: sent size too small, cc = %d\n",
 991                         device_get_nameunit(sc->sc_dev), cc);
 992                 goto error;
 993         }
 994
 995         /* convert from USB bytes to tty bytes */
 996         cc -= sc->sc_opkthdrlen;
 997
 998         crit_enter();
 999         CLR(tp->t_state, TS_BUSY);
1000         if (ISSET(tp->t_state, TS_FLUSH))
1001                 CLR(tp->t_state, TS_FLUSH);
1002         else
1003                 ndflush(&tp->t_outq, cc);
1004         (*linesw[tp->t_line].l_start)(tp);
1005         crit_exit();
1006
1007         return;
1008
1009   error:
1010         crit_enter();
1011         CLR(tp->t_state, TS_BUSY);
1012         crit_exit();
1013         return;
1014 }
1015
1016 static usbd_status
1017 ucomstartread(struct ucom_softc *sc)
1018 {
1019         usbd_status err;
1020
1021         DPRINTF(("ucomstartread: start\n"));
1022
1023         sc->sc_state &= ~UCS_RXSTOP;
1024
1025         if (sc->sc_bulkin_pipe == NULL)
1026                 return (USBD_NORMAL_COMPLETION);
1027
1028         usbd_setup_xfer(sc->sc_ixfer, sc->sc_bulkin_pipe,
1029                         (usbd_private_handle)sc,
1030                         sc->sc_ibuf, sc->sc_ibufsize,
1031                         USBD_SHORT_XFER_OK | USBD_NO_COPY,
1032                         USBD_NO_TIMEOUT, ucomreadcb);
1033
1034         err = usbd_transfer(sc->sc_ixfer);
1035         if (err != USBD_IN_PROGRESS) {
1036                 DPRINTF(("ucomstartread: err = %s\n", usbd_errstr(err)));
1037                 return (err);
1038         }
1039
1040         return (USBD_NORMAL_COMPLETION);
1041 }
1042
1043 static void
1044 ucomreadcb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1045 {
1046         struct ucom_softc *sc = (struct ucom_softc *)p;
1047         struct tty *tp = sc->sc_tty;
1048         int (*rint) (int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1049         usbd_status err;
1050         u_int32_t cc;
1051         u_char *cp;
1052         int lostcc;
1053
1054         DPRINTF(("ucomreadcb: status = %d\n", status));
1055
1056         if (status != USBD_NORMAL_COMPLETION) {
1057                 if (!(sc->sc_state & UCS_RXSTOP))
1058                         kprintf("%s: ucomreadcb: %s\n",
1059                                device_get_nameunit(sc->sc_dev), usbd_errstr(status));
1060                 if (status == USBD_STALLED)
1061                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1062                 /* XXX we should restart after some delay. */
1063                 return;
1064         }
1065
1066         usbd_get_xfer_status(xfer, NULL, (void **)&cp, &cc, NULL);
1067         DPRINTF(("ucomreadcb: got %d chars, tp = %p\n", cc, tp));
1068         if (cc == 0)
1069                 goto resubmit;
1070
1071         if (sc->sc_callback->ucom_read != NULL) {
1072                 sc->sc_callback->ucom_read(sc->sc_parent, sc->sc_portno,
1073                                            &cp, &cc);
1074         }
1075
1076         if (cc > sc->sc_ibufsize) {
1077                 kprintf("%s: invalid receive data size, %d chars\n",
1078                         device_get_nameunit(sc->sc_dev), cc);
1079                 goto resubmit;
1080         }
1081         if (cc < 1)
1082                 goto resubmit;
1083
1084         crit_enter();
1085         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1086                 if (tp->t_rawq.c_cc + cc > tp->t_ihiwat
1087                     && (sc->sc_state & UCS_RTS_IFLOW
1088                         || tp->t_iflag & IXOFF)
1089                     && !(tp->t_state & TS_TBLOCK))
1090                         ttyblock(tp);
1091                 lostcc = b_to_q((char *)cp, cc, &tp->t_rawq);
1092                 tp->t_rawcc += cc;
1093                 if (sc->hotchar) {
1094                         while (cc) {
1095                                 if (*cp == sc->hotchar)
1096                                         break;
1097                                 --cc;
1098                                 ++cp;
1099                         }
1100                         if (cc)
1101                                 setsofttty();
1102                 }
1103                 ttwakeup(tp);
1104                 if (tp->t_state & TS_TTSTOP
1105                     && (tp->t_iflag & IXANY
1106                         || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1107                         tp->t_state &= ~TS_TTSTOP;
1108                         tp->t_lflag &= ~FLUSHO;
1109                         ucomstart(tp);
1110                 }
1111                 if (lostcc > 0)
1112                         kprintf("%s: lost %d chars\n", device_get_nameunit(sc->sc_dev),
1113                                lostcc);
1114         } else {
1115                 /* Give characters to tty layer. */
1116                 while (cc > 0) {
1117                         DPRINTFN(7, ("ucomreadcb: char = 0x%02x\n", *cp));
1118                         if ((*rint)(*cp, tp) == -1) {
1119                                 /* XXX what should we do? */
1120                                 kprintf("%s: lost %d chars\n",
1121                                        device_get_nameunit(sc->sc_dev), cc);
1122                                 break;
1123                         }
1124                         cc--;
1125                         cp++;
1126                 }
1127         }
1128         crit_exit();
1129
1130 resubmit:
1131         err = ucomstartread(sc);
1132         if (err) {
1133                 kprintf("%s: read start failed\n", device_get_nameunit(sc->sc_dev));
1134                 /* XXX what should we dow now? */
1135         }
1136
1137         if ((sc->sc_state & UCS_RTS_IFLOW) && !ISSET(sc->sc_mcr, UMCR_RTS)
1138             && !(tp->t_state & TS_TBLOCK))
1139                 ucomctl(sc, UMCR_RTS, DMBIS);
1140 }
1141
1142 static void
1143 ucom_cleanup(struct ucom_softc *sc)
1144 {
1145         DPRINTF(("ucom_cleanup: closing pipes\n"));
1146
1147         ucom_shutdown(sc);
1148         if (sc->sc_bulkin_pipe != NULL) {
1149                 usbd_abort_pipe(sc->sc_bulkin_pipe);
1150                 usbd_close_pipe(sc->sc_bulkin_pipe);
1151                 sc->sc_bulkin_pipe = NULL;
1152         }
1153         if (sc->sc_bulkout_pipe != NULL) {
1154                 usbd_abort_pipe(sc->sc_bulkout_pipe);
1155                 usbd_close_pipe(sc->sc_bulkout_pipe);
1156                 sc->sc_bulkout_pipe = NULL;
1157         }
1158         if (sc->sc_ixfer != NULL) {
1159                 usbd_free_xfer(sc->sc_ixfer);
1160                 sc->sc_ixfer = NULL;
1161         }
1162         if (sc->sc_oxfer != NULL) {
1163                 usbd_free_xfer(sc->sc_oxfer);
1164                 sc->sc_oxfer = NULL;
1165         }
1166 }
1167
1168 static void
1169 ucomstopread(struct ucom_softc *sc)
1170 {
1171         usbd_status err;
1172
1173         DPRINTF(("ucomstopread: enter\n"));
1174
1175         if (!(sc->sc_state & UCS_RXSTOP)) {
1176                 sc->sc_state |= UCS_RXSTOP;
1177                 if (sc->sc_bulkin_pipe == NULL) {
1178                         DPRINTF(("ucomstopread: bulkin pipe NULL\n"));
1179                         return;
1180                 }
1181                 err = usbd_abort_pipe(sc->sc_bulkin_pipe);
1182                 if (err) {
1183                         DPRINTF(("ucomstopread: err = %s\n",
1184                                  usbd_errstr(err)));
1185                 }
1186         }
1187
1188         DPRINTF(("ucomstopread: leave\n"));
1189 }
1190
1191 static void
1192 disc_optim(struct tty *tp, struct termios *t, struct ucom_softc *sc)
1193 {
1194         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
1195             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
1196             && (!(t->c_iflag & PARMRK)
1197                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
1198             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
1199             && linesw[tp->t_line].l_rint == ttyinput) {
1200                 DPRINTF(("disc_optim: bypass l_rint\n"));
1201                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
1202         } else {
1203                 DPRINTF(("disc_optim: can't bypass l_rint\n"));
1204                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
1205         }
1206         sc->hotchar = linesw[tp->t_line].l_hotchar;
1207 }