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 1.22 2006/12/22 23:26:25 swildner 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 #if defined(__FreeBSD__) && __FreeBSD_version >= 500014
  82 #include <sys/selinfo.h>
  83 #else
  84 #include <sys/select.h>
  85 #endif
  86 #include <sys/proc.h>
  87 #include <sys/vnode.h>
  88 #include <sys/poll.h>
  89 #include <sys/sysctl.h>
  90 #include <sys/thread2.h>
  91
  92 #include <bus/usb/usb.h>
  93 #include <bus/usb/usbcdc.h>
  94
  95 #include <bus/usb/usbdi.h>
  96 #include <bus/usb/usbdi_util.h>
  97 #include <bus/usb/usbdevs.h>
  98 #include <bus/usb/usb_quirks.h>
  99
 100 #include "ucomvar.h"
 101
 102 #ifdef USB_DEBUG
 103 static int      ucomdebug = 0;
 104 SYSCTL_NODE(_hw_usb, OID_AUTO, ucom, CTLFLAG_RW, 0, "USB ucom");
 105 SYSCTL_INT(_hw_usb_ucom, OID_AUTO, debug, CTLFLAG_RW,
 106            &ucomdebug, 0, "ucom debug level");
 107 #define DPRINTF(x)      do { \
 108                                 if (ucomdebug) \
 109                                         logprintf x; \
 110                         } while (0)
 111
 112 #define DPRINTFN(n, x)  do { \
 113                                 if (ucomdebug > (n)) \
 114                                         logprintf x; \
 115                         } while (0)
 116 #else
 117 #define DPRINTF(x)
 118 #define DPRINTFN(n, x)
 119 #endif
 120
 121 Static d_open_t  ucomopen;
 122 Static d_close_t ucomclose;
 123 Static d_read_t  ucomread;
 124 Static d_write_t ucomwrite;
 125 Static d_ioctl_t ucomioctl;
 126
 127 #define UCOM_CDEV_MAJOR  138
 128
 129 static struct dev_ops ucom_ops = {
 130         { "ucom", UCOM_CDEV_MAJOR, D_TTY | D_KQFILTER },
 131         .d_open =       ucomopen,
 132         .d_close =      ucomclose,
 133         .d_read =       ucomread,
 134         .d_write =      ucomwrite,
 135         .d_ioctl =      ucomioctl,
 136         .d_poll =       ttypoll,
 137         .d_kqfilter =   ttykqfilter
 138 };
 139
 140 Static void ucom_cleanup(struct ucom_softc *);
 141 Static int ucomctl(struct ucom_softc *, int, int);
 142 Static int ucomparam(struct tty *, struct termios *);
 143 Static void ucomstart(struct tty *);
 144 Static void ucomstop(struct tty *, int);
 145 Static void ucom_shutdown(struct ucom_softc *);
 146 Static void ucom_dtr(struct ucom_softc *, int);
 147 Static void ucom_rts(struct ucom_softc *, int);
 148 Static void ucom_break(struct ucom_softc *, int);
 149 Static usbd_status ucomstartread(struct ucom_softc *);
 150 Static void ucomreadcb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 151 Static void ucomwritecb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 152 Static void ucomstopread(struct ucom_softc *);
 153 static void disc_optim(struct tty *, struct termios *, struct ucom_softc *);
 154
 155 devclass_t ucom_devclass;
 156
 157 static moduledata_t ucom_mod = {
 158         "ucom",
 159         NULL,
 160         NULL
 161 };
 162
 163 DECLARE_MODULE(ucom, ucom_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
 164 MODULE_DEPEND(ucom, usb, 1, 1, 1);
 165 MODULE_VERSION(ucom, UCOM_MODVER);
 166
 167 int
 168 ucom_attach(struct ucom_softc *sc)
 169 {
 170         struct tty *tp;
 171         int unit;
 172         cdev_t dev;
 173
 174         unit = device_get_unit(sc->sc_dev);
 175
 176         sc->sc_tty = tp = ttymalloc(sc->sc_tty);
 177         tp->t_oproc = ucomstart;
 178         tp->t_param = ucomparam;
 179         tp->t_stop = ucomstop;
 180
 181         DPRINTF(("ucom_attach: tty_attach tp = %p\n", tp));
 182
 183         DPRINTF(("ucom_attach: make_dev: ucom%d\n", unit));
 184
 185         dev_ops_add(&ucom_ops, UCOMUNIT_MASK, unit);
 186         dev = make_dev(&ucom_ops, unit | UCOM_CALLOUT_MASK,
 187                         UID_UUCP, GID_DIALER, 0660,
 188                         "ucom%d", unit);
 189         dev->si_tty = tp;
 190
 191         return (0);
 192 }
 193
 194 int
 195 ucom_detach(struct ucom_softc *sc)
 196 {
 197         struct tty *tp = sc->sc_tty;
 198         int unit;
 199
 200         DPRINTF(("ucom_detach: sc = %p, tp = %p\n", sc, sc->sc_tty));
 201
 202         sc->sc_dying = 1;
 203
 204         if (sc->sc_bulkin_pipe != NULL)
 205                 usbd_abort_pipe(sc->sc_bulkin_pipe);
 206         if (sc->sc_bulkout_pipe != NULL)
 207                 usbd_abort_pipe(sc->sc_bulkout_pipe);
 208
 209         if (tp != NULL) {
 210                 if (tp->t_state & TS_ISOPEN) {
 211                         device_printf(sc->sc_dev,
 212                                       "still open, forcing close\n");
 213                         (*linesw[tp->t_line].l_close)(tp, 0);
 214                         tp->t_gen++;
 215                         ttyclose(tp);
 216                         ttwakeup(tp);
 217                         ttwwakeup(tp);
 218                 }
 219         } else {
 220                 DPRINTF(("ucom_detach: no tty\n"));
 221                 return (0);
 222         }
 223
 224         crit_enter();
 225         if (--sc->sc_refcnt >= 0) {
 226                 /* Wait for processes to go away. */
 227                 usb_detach_wait(USBDEV(sc->sc_dev));
 228         }
 229         crit_exit();
 230
 231         unit = device_get_unit(sc->sc_dev);
 232         dev_ops_remove(&ucom_ops, UCOMUNIT_MASK, unit);
 233
 234         return (0);
 235 }
 236
 237 Static void
 238 ucom_shutdown(struct ucom_softc *sc)
 239 {
 240         struct tty *tp = sc->sc_tty;
 241
 242         DPRINTF(("ucom_shutdown\n"));
 243         /*
 244          * Hang up if necessary.  Wait a bit, so the other side has time to
 245          * notice even if we immediately open the port again.
 246          */
 247         if (ISSET(tp->t_cflag, HUPCL)) {
 248                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 249                 (void)tsleep(sc, 0, "ucomsd", hz);
 250         }
 251 }
 252
 253 Static int
 254 ucomopen(struct dev_open_args *ap)
 255 {
 256         cdev_t dev = ap->a_head.a_dev;
 257         int unit = UCOMUNIT(dev);
 258         struct ucom_softc *sc;
 259         usbd_status err;
 260         struct tty *tp;
 261         int error;
 262
 263         USB_GET_SC_OPEN(ucom, unit, sc);
 264
 265         if (sc->sc_dying)
 266                 return (ENXIO);
 267
 268         tp = sc->sc_tty;
 269
 270         DPRINTF(("%s: ucomopen: tp = %p\n", USBDEVNAME(sc->sc_dev), tp));
 271
 272         if (ISSET(tp->t_state, TS_ISOPEN) &&
 273             ISSET(tp->t_state, TS_XCLUDE) &&
 274             suser_cred(ap->a_cred, 0)
 275         ) {
 276                 return (EBUSY);
 277         }
 278
 279         /*
 280          * Do the following iff this is a first open.
 281          */
 282         crit_enter();
 283         while (sc->sc_opening)
 284                 tsleep(&sc->sc_opening, 0, "ucomop", 0);
 285         sc->sc_opening = 1;
 286
 287         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 288                 struct termios t;
 289
 290                 sc->sc_poll = 0;
 291                 sc->sc_lsr = sc->sc_msr = sc->sc_mcr = 0;
 292
 293                 tp->t_dev = reference_dev(dev);
 294
 295                 /*
 296                  * Initialize the termios status to the defaults.  Add in the
 297                  * sticky bits from TIOCSFLAGS.
 298                  */
 299                 t.c_ispeed = 0;
 300                 t.c_ospeed = TTYDEF_SPEED;
 301                 t.c_cflag = TTYDEF_CFLAG;
 302                 /* Make sure ucomparam() will do something. */
 303                 tp->t_ospeed = 0;
 304                 (void)ucomparam(tp, &t);
 305                 tp->t_iflag = TTYDEF_IFLAG;
 306                 tp->t_oflag = TTYDEF_OFLAG;
 307                 tp->t_lflag = TTYDEF_LFLAG;
 308                 ttychars(tp);
 309                 ttsetwater(tp);
 310
 311                 /*
 312                  * Turn on DTR.  We must always do this, even if carrier is not
 313                  * present, because otherwise we'd have to use TIOCSDTR
 314                  * immediately after setting CLOCAL, which applications do not
 315                  * expect.  We always assert DTR while the device is open
 316                  * unless explicitly requested to deassert it.
 317                  */
 318                 (void)ucomctl(sc, TIOCM_DTR | TIOCM_RTS, DMBIS);
 319
 320                 /* Device specific open */
 321                 if (sc->sc_callback->ucom_open != NULL) {
 322                         error = sc->sc_callback->ucom_open(sc->sc_parent,
 323                                                            sc->sc_portno);
 324                         if (error) {
 325                                 ucom_cleanup(sc);
 326                                 sc->sc_opening = 0;
 327                                 wakeup(&sc->sc_opening);
 328                                 crit_exit();
 329                                 return (error);
 330                         }
 331                 }
 332
 333                 DPRINTF(("ucomopen: open pipes in = %d out = %d\n",
 334                          sc->sc_bulkin_no, sc->sc_bulkout_no));
 335
 336                 /* Open the bulk pipes */
 337                 /* Bulk-in pipe */
 338                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkin_no, 0,
 339                                      &sc->sc_bulkin_pipe);
 340                 if (err) {
 341                         kprintf("%s: open bulk in error (addr %d): %s\n",
 342                                USBDEVNAME(sc->sc_dev), sc->sc_bulkin_no,
 343                                usbd_errstr(err));
 344                         error = EIO;
 345                         goto fail_0;
 346                 }
 347                 /* Bulk-out pipe */
 348                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkout_no,
 349                                      USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
 350                 if (err) {
 351                         kprintf("%s: open bulk out error (addr %d): %s\n",
 352                                USBDEVNAME(sc->sc_dev), sc->sc_bulkout_no,
 353                                usbd_errstr(err));
 354                         error = EIO;
 355                         goto fail_1;
 356                 }
 357
 358                 /* Allocate a request and an input buffer and start reading. */
 359                 sc->sc_ixfer = usbd_alloc_xfer(sc->sc_udev);
 360                 if (sc->sc_ixfer == NULL) {
 361                         error = ENOMEM;
 362                         goto fail_2;
 363                 }
 364
 365                 sc->sc_ibuf = usbd_alloc_buffer(sc->sc_ixfer,
 366                                                 sc->sc_ibufsizepad);
 367                 if (sc->sc_ibuf == NULL) {
 368                         error = ENOMEM;
 369                         goto fail_3;
 370                 }
 371
 372                 sc->sc_oxfer = usbd_alloc_xfer(sc->sc_udev);
 373                 if (sc->sc_oxfer == NULL) {
 374                         error = ENOMEM;
 375                         goto fail_3;
 376                 }
 377
 378                 sc->sc_obuf = usbd_alloc_buffer(sc->sc_oxfer,
 379                                                 sc->sc_obufsize +
 380                                                 sc->sc_opkthdrlen);
 381                 if (sc->sc_obuf == NULL) {
 382                         error = ENOMEM;
 383                         goto fail_4;
 384                 }
 385
 386                 /*
 387                  * Handle initial DCD.
 388                  */
 389                 if (ISSET(sc->sc_msr, UMSR_DCD) ||
 390                     (minor(dev) & UCOM_CALLOUT_MASK))
 391                         (*linesw[tp->t_line].l_modem)(tp, 1);
 392
 393                 ucomstartread(sc);
 394         }
 395
 396         sc->sc_opening = 0;
 397         wakeup(&sc->sc_opening);
 398         crit_exit();
 399
 400         error = ttyopen(dev, tp);
 401         if (error)
 402                 goto bad;
 403
 404         error = (*linesw[tp->t_line].l_open)(dev, tp);
 405         if (error)
 406                 goto bad;
 407
 408         disc_optim(tp, &tp->t_termios, sc);
 409
 410         DPRINTF(("%s: ucomopen: success\n", USBDEVNAME(sc->sc_dev)));
 411
 412         sc->sc_poll = 1;
 413         sc->sc_refcnt++;
 414
 415         return (0);
 416
 417 fail_4:
 418         usbd_free_xfer(sc->sc_oxfer);
 419         sc->sc_oxfer = NULL;
 420 fail_3:
 421         usbd_free_xfer(sc->sc_ixfer);
 422         sc->sc_ixfer = NULL;
 423 fail_2:
 424         usbd_close_pipe(sc->sc_bulkout_pipe);
 425         sc->sc_bulkout_pipe = NULL;
 426 fail_1:
 427         usbd_close_pipe(sc->sc_bulkin_pipe);
 428         sc->sc_bulkin_pipe = NULL;
 429 fail_0:
 430         sc->sc_opening = 0;
 431         wakeup(&sc->sc_opening);
 432         crit_exit();
 433         return (error);
 434
 435 bad:
 436         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 437                 /*
 438                  * We failed to open the device, and nobody else had it opened.
 439                  * Clean up the state as appropriate.
 440                  */
 441                 ucom_cleanup(sc);
 442         }
 443
 444         DPRINTF(("%s: ucomopen: failed\n", USBDEVNAME(sc->sc_dev)));
 445
 446         return (error);
 447 }
 448
 449 static int
 450 ucomclose(struct dev_close_args *ap)
 451 {
 452         cdev_t dev = ap->a_head.a_dev;
 453         struct ucom_softc *sc;
 454         struct tty *tp;
 455
 456         USB_GET_SC(ucom, UCOMUNIT(dev), sc);
 457
 458         tp = sc->sc_tty;
 459
 460         DPRINTF(("%s: ucomclose: unit = %d\n",
 461                 USBDEVNAME(sc->sc_dev), UCOMUNIT(dev)));
 462
 463         if (!ISSET(tp->t_state, TS_ISOPEN))
 464                 goto quit;
 465
 466         crit_enter();
 467         (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 468         disc_optim(tp, &tp->t_termios, sc);
 469         ttyclose(tp);
 470         crit_exit();
 471
 472         if (sc->sc_dying)
 473                 goto quit;
 474
 475         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 476                 /*
 477                  * Although we got a last close, the device may still be in
 478                  * use; e.g. if this was the dialout node, and there are still
 479                  * processes waiting for carrier on the non-dialout node.
 480                  */
 481                 ucom_cleanup(sc);
 482         }
 483
 484         if (sc->sc_callback->ucom_close != NULL)
 485                 sc->sc_callback->ucom_close(sc->sc_parent, sc->sc_portno);
 486
 487 quit:
 488         if (tp->t_dev) {
 489                 release_dev(tp->t_dev);
 490                 tp->t_dev = NULL;
 491         }
 492
 493         if (--sc->sc_refcnt < 0)
 494                 usb_detach_wakeup(USBDEV(sc->sc_dev));
 495
 496         return (0);
 497 }
 498
 499 static int
 500 ucomread(struct dev_read_args *ap)
 501 {
 502         cdev_t dev = ap->a_head.a_dev;
 503         struct ucom_softc *sc;
 504         struct tty *tp;
 505         int error;
 506
 507         USB_GET_SC(ucom, UCOMUNIT(dev), sc);
 508         tp = sc->sc_tty;
 509
 510         DPRINTF(("ucomread: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 511
 512         if (sc->sc_dying)
 513                 return (EIO);
 514
 515         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 516
 517         DPRINTF(("ucomread: error = %d\n", error));
 518
 519         return (error);
 520 }
 521
 522 static int
 523 ucomwrite(struct dev_write_args *ap)
 524 {
 525         cdev_t dev = ap->a_head.a_dev;
 526         struct ucom_softc *sc;
 527         struct tty *tp;
 528         int error;
 529
 530         USB_GET_SC(ucom, UCOMUNIT(dev), sc);
 531         tp = sc->sc_tty;
 532
 533         DPRINTF(("ucomwrite: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 534
 535         if (sc->sc_dying)
 536                 return (EIO);
 537
 538         error = (*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag);
 539
 540         DPRINTF(("ucomwrite: error = %d\n", error));
 541
 542         return (error);
 543 }
 544
 545 static int
 546 ucomioctl(struct dev_ioctl_args *ap)
 547 {
 548         cdev_t dev = ap->a_head.a_dev;
 549         struct ucom_softc *sc;
 550         struct tty *tp;
 551         int error;
 552         int d;
 553
 554         USB_GET_SC(ucom, UCOMUNIT(dev), sc);
 555         tp = sc->sc_tty;
 556
 557         if (sc->sc_dying)
 558                 return (EIO);
 559
 560         DPRINTF(("ucomioctl: cmd = 0x%08lx\n", ap->a_cmd));
 561
 562         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 563                                               ap->a_fflag, ap->a_cred);
 564         if (error != ENOIOCTL) {
 565                 DPRINTF(("ucomioctl: l_ioctl: error = %d\n", error));
 566                 return (error);
 567         }
 568
 569         crit_enter();
 570
 571         error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 572         disc_optim(tp, &tp->t_termios, sc);
 573         if (error != ENOIOCTL) {
 574                 crit_exit();
 575                 DPRINTF(("ucomioctl: ttioctl: error = %d\n", error));
 576                 return (error);
 577         }
 578
 579         if (sc->sc_callback->ucom_ioctl != NULL) {
 580                 error = sc->sc_callback->ucom_ioctl(sc->sc_parent,
 581                                                     sc->sc_portno,
 582                                                     ap->a_cmd, ap->a_data,
 583                                                     ap->a_fflag, curthread);
 584                 if (error >= 0) {
 585                         crit_exit();
 586                         return (error);
 587                 }
 588         }
 589
 590         error = 0;
 591
 592         DPRINTF(("ucomioctl: our cmd = 0x%08lx\n", ap->a_cmd));
 593
 594         switch (ap->a_cmd) {
 595         case TIOCSBRK:
 596                 DPRINTF(("ucomioctl: TIOCSBRK\n"));
 597                 ucom_break(sc, 1);
 598                 break;
 599         case TIOCCBRK:
 600                 DPRINTF(("ucomioctl: TIOCCBRK\n"));
 601                 ucom_break(sc, 0);
 602                 break;
 603
 604         case TIOCSDTR:
 605                 DPRINTF(("ucomioctl: TIOCSDTR\n"));
 606                 (void)ucomctl(sc, TIOCM_DTR, DMBIS);
 607                 break;
 608         case TIOCCDTR:
 609                 DPRINTF(("ucomioctl: TIOCCDTR\n"));
 610                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 611                 break;
 612
 613         case TIOCMSET:
 614                 d = *(int *)ap->a_data;
 615                 DPRINTF(("ucomioctl: TIOCMSET, 0x%x\n", d));
 616                 (void)ucomctl(sc, d, DMSET);
 617                 break;
 618         case TIOCMBIS:
 619                 d = *(int *)ap->a_data;
 620                 DPRINTF(("ucomioctl: TIOCMBIS, 0x%x\n", d));
 621                 (void)ucomctl(sc, d, DMBIS);
 622                 break;
 623         case TIOCMBIC:
 624                 d = *(int *)ap->a_data;
 625                 DPRINTF(("ucomioctl: TIOCMBIC, 0x%x\n", d));
 626                 (void)ucomctl(sc, d, DMBIC);
 627                 break;
 628         case TIOCMGET:
 629                 d = ucomctl(sc, 0, DMGET);
 630                 DPRINTF(("ucomioctl: TIOCMGET, 0x%x\n", d));
 631                 *(int *)ap->a_data = d;
 632                 break;
 633
 634         default:
 635                 DPRINTF(("ucomioctl: error: our cmd = 0x%08lx\n", ap->a_cmd));
 636                 error = ENOTTY;
 637                 break;
 638         }
 639
 640         crit_exit();
 641
 642         return (error);
 643 }
 644
 645 Static int
 646 ucomctl(struct ucom_softc *sc, int bits, int how)
 647 {
 648         int     mcr;
 649         int     msr;
 650         int     onoff;
 651
 652         DPRINTF(("ucomctl: bits = 0x%x, how = %d\n", bits, how));
 653
 654         if (how == DMGET) {
 655                 SET(bits, TIOCM_LE);            /* always set TIOCM_LE bit */
 656                 DPRINTF(("ucomctl: DMGET: LE"));
 657
 658                 mcr = sc->sc_mcr;
 659                 if (ISSET(mcr, UMCR_DTR)) {
 660                         SET(bits, TIOCM_DTR);
 661                         DPRINTF((" DTR"));
 662                 }
 663                 if (ISSET(mcr, UMCR_RTS)) {
 664                         SET(bits, TIOCM_RTS);
 665                         DPRINTF((" RTS"));
 666                 }
 667
 668                 msr = sc->sc_msr;
 669                 if (ISSET(msr, UMSR_CTS)) {
 670                         SET(bits, TIOCM_CTS);
 671                         DPRINTF((" CTS"));
 672                 }
 673                 if (ISSET(msr, UMSR_DCD)) {
 674                         SET(bits, TIOCM_CD);
 675                         DPRINTF((" CD"));
 676                 }
 677                 if (ISSET(msr, UMSR_DSR)) {
 678                         SET(bits, TIOCM_DSR);
 679                         DPRINTF((" DSR"));
 680                 }
 681                 if (ISSET(msr, UMSR_RI)) {
 682                         SET(bits, TIOCM_RI);
 683                         DPRINTF((" RI"));
 684                 }
 685
 686                 DPRINTF(("\n"));
 687
 688                 return (bits);
 689         }
 690
 691         mcr = 0;
 692         if (ISSET(bits, TIOCM_DTR))
 693                 SET(mcr, UMCR_DTR);
 694         if (ISSET(bits, TIOCM_RTS))
 695                 SET(mcr, UMCR_RTS);
 696
 697         switch (how) {
 698         case DMSET:
 699                 sc->sc_mcr = mcr;
 700                 break;
 701         case DMBIS:
 702                 sc->sc_mcr |= mcr;
 703                 break;
 704         case DMBIC:
 705                 sc->sc_mcr &= ~mcr;
 706                 break;
 707         }
 708
 709         onoff = ISSET(sc->sc_mcr, UMCR_DTR) ? 1 : 0;
 710         ucom_dtr(sc, onoff);
 711
 712         onoff = ISSET(sc->sc_mcr, UMCR_RTS) ? 1 : 0;
 713         ucom_rts(sc, onoff);
 714
 715         return (0);
 716 }
 717
 718 Static void
 719 ucom_break(struct ucom_softc *sc, int onoff)
 720 {
 721         DPRINTF(("ucom_break: onoff = %d\n", onoff));
 722
 723         if (sc->sc_callback->ucom_set == NULL)
 724                 return;
 725         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 726                                   UCOM_SET_BREAK, onoff);
 727 }
 728
 729 Static void
 730 ucom_dtr(struct ucom_softc *sc, int onoff)
 731 {
 732         DPRINTF(("ucom_dtr: onoff = %d\n", onoff));
 733
 734         if (sc->sc_callback->ucom_set == NULL)
 735                 return;
 736         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 737                                   UCOM_SET_DTR, onoff);
 738 }
 739
 740 Static void
 741 ucom_rts(struct ucom_softc *sc, int onoff)
 742 {
 743         DPRINTF(("ucom_rts: onoff = %d\n", onoff));
 744
 745         if (sc->sc_callback->ucom_set == NULL)
 746                 return;
 747         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 748                                   UCOM_SET_RTS, onoff);
 749 }
 750
 751 void
 752 ucom_status_change(struct ucom_softc *sc)
 753 {
 754         struct tty *tp = sc->sc_tty;
 755         u_char old_msr;
 756         int onoff;
 757
 758         if (sc->sc_callback->ucom_get_status == NULL) {
 759                 sc->sc_lsr = 0;
 760                 sc->sc_msr = 0;
 761                 return;
 762         }
 763
 764         old_msr = sc->sc_msr;
 765         sc->sc_callback->ucom_get_status(sc->sc_parent, sc->sc_portno,
 766                                          &sc->sc_lsr, &sc->sc_msr);
 767         if (ISSET((sc->sc_msr ^ old_msr), UMSR_DCD)) {
 768                 if (sc->sc_poll == 0)
 769                         return;
 770                 onoff = ISSET(sc->sc_msr, UMSR_DCD) ? 1 : 0;
 771                 DPRINTF(("ucom_status_change: DCD changed to %d\n", onoff));
 772                 (*linesw[tp->t_line].l_modem)(tp, onoff);
 773         }
 774 }
 775
 776 Static int
 777 ucomparam(struct tty *tp, struct termios *t)
 778 {
 779         struct ucom_softc *sc;
 780         int error;
 781         usbd_status uerr;
 782
 783         USB_GET_SC(ucom, UCOMUNIT(tp->t_dev), sc);
 784
 785         if (sc->sc_dying)
 786                 return (EIO);
 787
 788         DPRINTF(("ucomparam: sc = %p\n", sc));
 789
 790         /* Check requested parameters. */
 791         if (t->c_ospeed < 0) {
 792                 DPRINTF(("ucomparam: negative ospeed\n"));
 793                 return (EINVAL);
 794         }
 795         if (t->c_ispeed && t->c_ispeed != t->c_ospeed) {
 796                 DPRINTF(("ucomparam: mismatch ispeed and ospeed\n"));
 797                 return (EINVAL);
 798         }
 799
 800         /*
 801          * If there were no changes, don't do anything.  This avoids dropping
 802          * input and improves performance when all we did was frob things like
 803          * VMIN and VTIME.
 804          */
 805         if (tp->t_ospeed == t->c_ospeed &&
 806             tp->t_cflag == t->c_cflag)
 807                 return (0);
 808
 809         /* And copy to tty. */
 810         tp->t_ispeed = 0;
 811         tp->t_ospeed = t->c_ospeed;
 812         tp->t_cflag = t->c_cflag;
 813
 814         if (sc->sc_callback->ucom_param == NULL)
 815                 return (0);
 816
 817         ucomstopread(sc);
 818
 819         error = sc->sc_callback->ucom_param(sc->sc_parent, sc->sc_portno, t);
 820         if (error) {
 821                 DPRINTF(("ucomparam: callback: error = %d\n", error));
 822                 return (error);
 823         }
 824
 825         ttsetwater(tp);
 826
 827         if (t->c_cflag & CRTS_IFLOW) {
 828                 sc->sc_state |= UCS_RTS_IFLOW;
 829         } else if (sc->sc_state & UCS_RTS_IFLOW) {
 830                 sc->sc_state &= ~UCS_RTS_IFLOW;
 831                 (void)ucomctl(sc, UMCR_RTS, DMBIS);
 832         }
 833
 834         disc_optim(tp, t, sc);
 835
 836         uerr = ucomstartread(sc);
 837         if (uerr != USBD_NORMAL_COMPLETION)
 838                 return (EIO);
 839
 840         return (0);
 841 }
 842
 843 Static void
 844 ucomstart(struct tty *tp)
 845 {
 846         struct ucom_softc *sc;
 847         struct cblock *cbp;
 848         usbd_status err;
 849         u_char *data;
 850         int cnt;
 851
 852         USB_GET_SC(ucom, UCOMUNIT(tp->t_dev), sc);
 853         DPRINTF(("ucomstart: sc = %p\n", sc));
 854
 855         if (sc->sc_dying)
 856                 return;
 857
 858         crit_enter();
 859
 860         if (tp->t_state & TS_TBLOCK) {
 861                 if (ISSET(sc->sc_mcr, UMCR_RTS) &&
 862                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 863                         DPRINTF(("ucomstart: clear RTS\n"));
 864                         (void)ucomctl(sc, UMCR_RTS, DMBIC);
 865                 }
 866         } else {
 867                 if (!ISSET(sc->sc_mcr, UMCR_RTS) &&
 868                     tp->t_rawq.c_cc <= tp->t_ilowat &&
 869                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 870                         DPRINTF(("ucomstart: set RTS\n"));
 871                         (void)ucomctl(sc, UMCR_RTS, DMBIS);
 872                 }
 873         }
 874
 875         if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) {
 876                 ttwwakeup(tp);
 877                 DPRINTF(("ucomstart: stopped\n"));
 878                 goto out;
 879         }
 880
 881         if (tp->t_outq.c_cc <= tp->t_olowat) {
 882                 if (ISSET(tp->t_state, TS_SO_OLOWAT)) {
 883                         CLR(tp->t_state, TS_SO_OLOWAT);
 884                         wakeup(TSA_OLOWAT(tp));
 885                 }
 886                 selwakeuppri(&tp->t_wsel, TTIPRI);
 887                 if (tp->t_outq.c_cc == 0) {
 888                         if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
 889                             TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
 890                                 CLR(tp->t_state, TS_SO_OCOMPLETE);
 891                                 wakeup(TSA_OCOMPLETE(tp));
 892                         }
 893                         goto out;
 894                 }
 895         }
 896
 897         /* Grab the first contiguous region of buffer space. */
 898         data = tp->t_outq.c_cf;
 899         cbp = (struct cblock *) ((intptr_t) tp->t_outq.c_cf & ~CROUND);
 900         cnt = min((char *) (cbp+1) - tp->t_outq.c_cf, tp->t_outq.c_cc);
 901
 902         if (cnt == 0) {
 903                 DPRINTF(("ucomstart: cnt == 0\n"));
 904                 goto out;
 905         }
 906
 907         SET(tp->t_state, TS_BUSY);
 908
 909         if (cnt > sc->sc_obufsize) {
 910                 DPRINTF(("ucomstart: big buffer %d chars\n", cnt));
 911                 cnt = sc->sc_obufsize;
 912         }
 913         if (sc->sc_callback->ucom_write != NULL)
 914                 sc->sc_callback->ucom_write(sc->sc_parent, sc->sc_portno,
 915                                             sc->sc_obuf, data, &cnt);
 916         else
 917                 memcpy(sc->sc_obuf, data, cnt);
 918
 919         DPRINTF(("ucomstart: %d chars\n", cnt));
 920         usbd_setup_xfer(sc->sc_oxfer, sc->sc_bulkout_pipe,
 921                         (usbd_private_handle)sc, sc->sc_obuf, cnt,
 922                         USBD_NO_COPY, USBD_NO_TIMEOUT, ucomwritecb);
 923         /* What can we do on error? */
 924         err = usbd_transfer(sc->sc_oxfer);
 925         if (err != USBD_IN_PROGRESS)
 926                 kprintf("ucomstart: err=%s\n", usbd_errstr(err));
 927
 928         ttwwakeup(tp);
 929
 930     out:
 931         crit_exit();
 932 }
 933
 934 Static void
 935 ucomstop(struct tty *tp, int flag)
 936 {
 937         struct ucom_softc *sc;
 938
 939         USB_GET_SC(ucom, UCOMUNIT(tp->t_dev), sc);
 940
 941         DPRINTF(("ucomstop: %d\n", flag));
 942
 943         if (flag & FREAD) {
 944                 /*
 945                  * This is just supposed to flush pending receive data,
 946                  * not stop the reception of data entirely!
 947                  */
 948                 DPRINTF(("ucomstop: read\n"));
 949                 ucomstopread(sc);
 950                 ucomstartread(sc);
 951         }
 952
 953         if (flag & FWRITE) {
 954                 DPRINTF(("ucomstop: write\n"));
 955                 crit_enter();
 956                 if (ISSET(tp->t_state, TS_BUSY)) {
 957                         /* XXX do what? */
 958                         if (!ISSET(tp->t_state, TS_TTSTOP))
 959                                 SET(tp->t_state, TS_FLUSH);
 960                 }
 961                 crit_exit();
 962         }
 963
 964         DPRINTF(("ucomstop: done\n"));
 965 }
 966
 967 Static void
 968 ucomwritecb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
 969 {
 970         struct ucom_softc *sc = (struct ucom_softc *)p;
 971         struct tty *tp = sc->sc_tty;
 972         u_int32_t cc;
 973
 974         DPRINTF(("ucomwritecb: status = %d\n", status));
 975
 976         if (status == USBD_CANCELLED || sc->sc_dying)
 977                 goto error;
 978
 979         if (status != USBD_NORMAL_COMPLETION) {
 980                 kprintf("%s: ucomwritecb: %s\n",
 981                        USBDEVNAME(sc->sc_dev), usbd_errstr(status));
 982                 if (status == USBD_STALLED)
 983                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
 984                 /*
 985                  * XXX.  We may need a flag to sequence ucomstopread() and
 986                  * ucomstartread() to handle the case where ucomstartread()
 987                  * is called after ucomstopread() but before the request has
 988                  * been properly canceled?
 989                  */
 990                 goto error;
 991         }
 992
 993         usbd_get_xfer_status(xfer, NULL, NULL, &cc, NULL);
 994         DPRINTF(("ucomwritecb: cc = %d\n", cc));
 995         if (cc <= sc->sc_opkthdrlen) {
 996                 kprintf("%s: sent size too small, cc = %d\n",
 997                         USBDEVNAME(sc->sc_dev), cc);
 998                 goto error;
 999         }
1000
1001         /* convert from USB bytes to tty bytes */
1002         cc -= sc->sc_opkthdrlen;
1003
1004         crit_enter();
1005         CLR(tp->t_state, TS_BUSY);
1006         if (ISSET(tp->t_state, TS_FLUSH))
1007                 CLR(tp->t_state, TS_FLUSH);
1008         else
1009                 ndflush(&tp->t_outq, cc);
1010         (*linesw[tp->t_line].l_start)(tp);
1011         crit_exit();
1012
1013         return;
1014
1015   error:
1016         crit_enter();
1017         CLR(tp->t_state, TS_BUSY);
1018         crit_exit();
1019         return;
1020 }
1021
1022 Static usbd_status
1023 ucomstartread(struct ucom_softc *sc)
1024 {
1025         usbd_status err;
1026
1027         DPRINTF(("ucomstartread: start\n"));
1028
1029         sc->sc_state &= ~UCS_RXSTOP;
1030
1031         if (sc->sc_bulkin_pipe == NULL)
1032                 return (USBD_NORMAL_COMPLETION);
1033
1034         usbd_setup_xfer(sc->sc_ixfer, sc->sc_bulkin_pipe,
1035                         (usbd_private_handle)sc,
1036                         sc->sc_ibuf, sc->sc_ibufsize,
1037                         USBD_SHORT_XFER_OK | USBD_NO_COPY,
1038                         USBD_NO_TIMEOUT, ucomreadcb);
1039
1040         err = usbd_transfer(sc->sc_ixfer);
1041         if (err != USBD_IN_PROGRESS) {
1042                 DPRINTF(("ucomstartread: err = %s\n", usbd_errstr(err)));
1043                 return (err);
1044         }
1045
1046         return (USBD_NORMAL_COMPLETION);
1047 }
1048
1049 Static void
1050 ucomreadcb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1051 {
1052         struct ucom_softc *sc = (struct ucom_softc *)p;
1053         struct tty *tp = sc->sc_tty;
1054         int (*rint) (int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1055         usbd_status err;
1056         u_int32_t cc;
1057         u_char *cp;
1058         int lostcc;
1059
1060         DPRINTF(("ucomreadcb: status = %d\n", status));
1061
1062         if (status != USBD_NORMAL_COMPLETION) {
1063                 if (!(sc->sc_state & UCS_RXSTOP))
1064                         kprintf("%s: ucomreadcb: %s\n",
1065                                USBDEVNAME(sc->sc_dev), usbd_errstr(status));
1066                 if (status == USBD_STALLED)
1067                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1068                 /* XXX we should restart after some delay. */
1069                 return;
1070         }
1071
1072         usbd_get_xfer_status(xfer, NULL, (void **)&cp, &cc, NULL);
1073         DPRINTF(("ucomreadcb: got %d chars, tp = %p\n", cc, tp));
1074         if (cc == 0)
1075                 goto resubmit;
1076
1077         if (sc->sc_callback->ucom_read != NULL) {
1078                 sc->sc_callback->ucom_read(sc->sc_parent, sc->sc_portno,
1079                                            &cp, &cc);
1080         }
1081
1082         if (cc > sc->sc_ibufsize) {
1083                 kprintf("%s: invalid receive data size, %d chars\n",
1084                         USBDEVNAME(sc->sc_dev), cc);
1085                 goto resubmit;
1086         }
1087         if (cc < 1)
1088                 goto resubmit;
1089
1090         crit_enter();
1091         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1092                 if (tp->t_rawq.c_cc + cc > tp->t_ihiwat
1093                     && (sc->sc_state & UCS_RTS_IFLOW
1094                         || tp->t_iflag & IXOFF)
1095                     && !(tp->t_state & TS_TBLOCK))
1096                         ttyblock(tp);
1097                 lostcc = b_to_q((char *)cp, cc, &tp->t_rawq);
1098                 tp->t_rawcc += cc;
1099                 if (sc->hotchar) {
1100                         while (cc) {
1101                                 if (*cp == sc->hotchar)
1102                                         break;
1103                                 --cc;
1104                                 ++cp;
1105                         }
1106                         if (cc)
1107                                 setsofttty();
1108                 }
1109                 ttwakeup(tp);
1110                 if (tp->t_state & TS_TTSTOP
1111                     && (tp->t_iflag & IXANY
1112                         || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1113                         tp->t_state &= ~TS_TTSTOP;
1114                         tp->t_lflag &= ~FLUSHO;
1115                         ucomstart(tp);
1116                 }
1117                 if (lostcc > 0)
1118                         kprintf("%s: lost %d chars\n", USBDEVNAME(sc->sc_dev),
1119                                lostcc);
1120         } else {
1121                 /* Give characters to tty layer. */
1122                 while (cc > 0) {
1123                         DPRINTFN(7, ("ucomreadcb: char = 0x%02x\n", *cp));
1124                         if ((*rint)(*cp, tp) == -1) {
1125                                 /* XXX what should we do? */
1126                                 kprintf("%s: lost %d chars\n",
1127                                        USBDEVNAME(sc->sc_dev), cc);
1128                                 break;
1129                         }
1130                         cc--;
1131                         cp++;
1132                 }
1133         }
1134         crit_exit();
1135
1136 resubmit:
1137         err = ucomstartread(sc);
1138         if (err) {
1139                 kprintf("%s: read start failed\n", USBDEVNAME(sc->sc_dev));
1140                 /* XXX what should we dow now? */
1141         }
1142
1143         if ((sc->sc_state & UCS_RTS_IFLOW) && !ISSET(sc->sc_mcr, UMCR_RTS)
1144             && !(tp->t_state & TS_TBLOCK))
1145                 ucomctl(sc, UMCR_RTS, DMBIS);
1146 }
1147
1148 Static void
1149 ucom_cleanup(struct ucom_softc *sc)
1150 {
1151         DPRINTF(("ucom_cleanup: closing pipes\n"));
1152
1153         ucom_shutdown(sc);
1154         if (sc->sc_bulkin_pipe != NULL) {
1155                 usbd_abort_pipe(sc->sc_bulkin_pipe);
1156                 usbd_close_pipe(sc->sc_bulkin_pipe);
1157                 sc->sc_bulkin_pipe = NULL;
1158         }
1159         if (sc->sc_bulkout_pipe != NULL) {
1160                 usbd_abort_pipe(sc->sc_bulkout_pipe);
1161                 usbd_close_pipe(sc->sc_bulkout_pipe);
1162                 sc->sc_bulkout_pipe = NULL;
1163         }
1164         if (sc->sc_ixfer != NULL) {
1165                 usbd_free_xfer(sc->sc_ixfer);
1166                 sc->sc_ixfer = NULL;
1167         }
1168         if (sc->sc_oxfer != NULL) {
1169                 usbd_free_xfer(sc->sc_oxfer);
1170                 sc->sc_oxfer = NULL;
1171         }
1172 }
1173
1174 Static void
1175 ucomstopread(struct ucom_softc *sc)
1176 {
1177         usbd_status err;
1178
1179         DPRINTF(("ucomstopread: enter\n"));
1180
1181         if (!(sc->sc_state & UCS_RXSTOP)) {
1182                 sc->sc_state |= UCS_RXSTOP;
1183                 if (sc->sc_bulkin_pipe == NULL) {
1184                         DPRINTF(("ucomstopread: bulkin pipe NULL\n"));
1185                         return;
1186                 }
1187                 err = usbd_abort_pipe(sc->sc_bulkin_pipe);
1188                 if (err) {
1189                         DPRINTF(("ucomstopread: err = %s\n",
1190                                  usbd_errstr(err)));
1191                 }
1192         }
1193
1194         DPRINTF(("ucomstopread: leave\n"));
1195 }
1196
1197 static void
1198 disc_optim(struct tty *tp, struct termios *t, struct ucom_softc *sc)
1199 {
1200         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
1201             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
1202             && (!(t->c_iflag & PARMRK)
1203                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
1204             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
1205             && linesw[tp->t_line].l_rint == ttyinput) {
1206                 DPRINTF(("disc_optim: bypass l_rint\n"));
1207                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
1208         } else {
1209                 DPRINTF(("disc_optim: can't bypass l_rint\n"));
1210                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
1211         }
1212         sc->hotchar = linesw[tp->t_line].l_hotchar;
1213 }