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 1.19 2005/06/10 23:11:54 dillon 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 cdevsw ucom_cdevsw = {
 130         /* name */      "ucom",
 131         /* maj */       UCOM_CDEV_MAJOR,
 132         /* flags */     D_TTY | D_KQFILTER,
 133         /* port */      NULL,
 134         /* clone */     NULL,
 135
 136         /* open */      ucomopen,
 137         /* close */     ucomclose,
 138         /* read */      ucomread,
 139         /* write */     ucomwrite,
 140         /* ioctl */     ucomioctl,
 141         /* poll */      ttypoll,
 142         /* mmap */      nommap,
 143         /* strategy */  nostrategy,
 144         /* dump */      nodump,
 145         /* psize */     nopsize,
 146         /* kqfilter */  ttykqfilter
 147 };
 148
 149 Static void ucom_cleanup(struct ucom_softc *);
 150 Static int ucomctl(struct ucom_softc *, int, int);
 151 Static int ucomparam(struct tty *, struct termios *);
 152 Static void ucomstart(struct tty *);
 153 Static void ucomstop(struct tty *, int);
 154 Static void ucom_shutdown(struct ucom_softc *);
 155 Static void ucom_dtr(struct ucom_softc *, int);
 156 Static void ucom_rts(struct ucom_softc *, int);
 157 Static void ucom_break(struct ucom_softc *, int);
 158 Static usbd_status ucomstartread(struct ucom_softc *);
 159 Static void ucomreadcb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 160 Static void ucomwritecb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 161 Static void ucomstopread(struct ucom_softc *);
 162 static void disc_optim(struct tty *, struct termios *, struct ucom_softc *);
 163
 164 devclass_t ucom_devclass;
 165
 166 static moduledata_t ucom_mod = {
 167         "ucom",
 168         NULL,
 169         NULL
 170 };
 171
 172 DECLARE_MODULE(ucom, ucom_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
 173 MODULE_DEPEND(ucom, usb, 1, 1, 1);
 174 MODULE_VERSION(ucom, UCOM_MODVER);
 175
 176 int
 177 ucom_attach(struct ucom_softc *sc)
 178 {
 179         struct tty *tp;
 180         int unit;
 181         dev_t dev;
 182
 183         unit = device_get_unit(sc->sc_dev);
 184
 185         sc->sc_tty = tp = ttymalloc(sc->sc_tty);
 186         tp->t_oproc = ucomstart;
 187         tp->t_param = ucomparam;
 188         tp->t_stop = ucomstop;
 189
 190         DPRINTF(("ucom_attach: tty_attach tp = %p\n", tp));
 191
 192         DPRINTF(("ucom_attach: make_dev: ucom%d\n", unit));
 193
 194         cdevsw_add(&ucom_cdevsw, UCOMUNIT_MASK, unit);
 195         dev = make_dev(&ucom_cdevsw, unit | UCOM_CALLOUT_MASK,
 196                         UID_UUCP, GID_DIALER, 0660,
 197                         "ucom%d", unit);
 198         dev->si_tty = tp;
 199
 200         return (0);
 201 }
 202
 203 int
 204 ucom_detach(struct ucom_softc *sc)
 205 {
 206         struct tty *tp = sc->sc_tty;
 207         int unit;
 208
 209         DPRINTF(("ucom_detach: sc = %p, tp = %p\n", sc, sc->sc_tty));
 210
 211         sc->sc_dying = 1;
 212
 213         if (sc->sc_bulkin_pipe != NULL)
 214                 usbd_abort_pipe(sc->sc_bulkin_pipe);
 215         if (sc->sc_bulkout_pipe != NULL)
 216                 usbd_abort_pipe(sc->sc_bulkout_pipe);
 217
 218         if (tp != NULL) {
 219                 if (tp->t_state & TS_ISOPEN) {
 220                         device_printf(sc->sc_dev,
 221                                       "still open, forcing close\n");
 222                         (*linesw[tp->t_line].l_close)(tp, 0);
 223                         tp->t_gen++;
 224                         ttyclose(tp);
 225                         ttwakeup(tp);
 226                         ttwwakeup(tp);
 227                 }
 228         } else {
 229                 DPRINTF(("ucom_detach: no tty\n"));
 230                 return (0);
 231         }
 232
 233         crit_enter();
 234         if (--sc->sc_refcnt >= 0) {
 235                 /* Wait for processes to go away. */
 236                 usb_detach_wait(USBDEV(sc->sc_dev));
 237         }
 238         crit_exit();
 239
 240         unit = device_get_unit(sc->sc_dev);
 241         cdevsw_remove(&ucom_cdevsw, UCOMUNIT_MASK, unit);
 242
 243         return (0);
 244 }
 245
 246 Static void
 247 ucom_shutdown(struct ucom_softc *sc)
 248 {
 249         struct tty *tp = sc->sc_tty;
 250
 251         DPRINTF(("ucom_shutdown\n"));
 252         /*
 253          * Hang up if necessary.  Wait a bit, so the other side has time to
 254          * notice even if we immediately open the port again.
 255          */
 256         if (ISSET(tp->t_cflag, HUPCL)) {
 257                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 258                 (void)tsleep(sc, 0, "ucomsd", hz);
 259         }
 260 }
 261
 262 Static int
 263 ucomopen(dev_t dev, int flag, int mode, usb_proc_ptr td)
 264 {
 265         int unit = UCOMUNIT(dev);
 266         struct ucom_softc *sc;
 267         usbd_status err;
 268         struct tty *tp;
 269         int error;
 270
 271         KKASSERT(td != NULL);
 272
 273         USB_GET_SC_OPEN(ucom, unit, sc);
 274
 275         if (sc->sc_dying)
 276                 return (ENXIO);
 277
 278         tp = sc->sc_tty;
 279
 280         DPRINTF(("%s: ucomopen: tp = %p\n", USBDEVNAME(sc->sc_dev), tp));
 281
 282         if (ISSET(tp->t_state, TS_ISOPEN) &&
 283             ISSET(tp->t_state, TS_XCLUDE) &&
 284             suser(td)
 285         ) {
 286                 return (EBUSY);
 287         }
 288
 289         /*
 290          * Do the following iff this is a first open.
 291          */
 292         crit_enter();
 293         while (sc->sc_opening)
 294                 tsleep(&sc->sc_opening, 0, "ucomop", 0);
 295         sc->sc_opening = 1;
 296
 297         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 298                 struct termios t;
 299
 300                 sc->sc_poll = 0;
 301                 sc->sc_lsr = sc->sc_msr = sc->sc_mcr = 0;
 302
 303                 tp->t_dev = reference_dev(dev);
 304
 305                 /*
 306                  * Initialize the termios status to the defaults.  Add in the
 307                  * sticky bits from TIOCSFLAGS.
 308                  */
 309                 t.c_ispeed = 0;
 310                 t.c_ospeed = TTYDEF_SPEED;
 311                 t.c_cflag = TTYDEF_CFLAG;
 312                 /* Make sure ucomparam() will do something. */
 313                 tp->t_ospeed = 0;
 314                 (void)ucomparam(tp, &t);
 315                 tp->t_iflag = TTYDEF_IFLAG;
 316                 tp->t_oflag = TTYDEF_OFLAG;
 317                 tp->t_lflag = TTYDEF_LFLAG;
 318                 ttychars(tp);
 319                 ttsetwater(tp);
 320
 321                 /*
 322                  * Turn on DTR.  We must always do this, even if carrier is not
 323                  * present, because otherwise we'd have to use TIOCSDTR
 324                  * immediately after setting CLOCAL, which applications do not
 325                  * expect.  We always assert DTR while the device is open
 326                  * unless explicitly requested to deassert it.
 327                  */
 328                 (void)ucomctl(sc, TIOCM_DTR | TIOCM_RTS, DMBIS);
 329
 330                 /* Device specific open */
 331                 if (sc->sc_callback->ucom_open != NULL) {
 332                         error = sc->sc_callback->ucom_open(sc->sc_parent,
 333                                                            sc->sc_portno);
 334                         if (error) {
 335                                 ucom_cleanup(sc);
 336                                 sc->sc_opening = 0;
 337                                 wakeup(&sc->sc_opening);
 338                                 crit_exit();
 339                                 return (error);
 340                         }
 341                 }
 342
 343                 DPRINTF(("ucomopen: open pipes in = %d out = %d\n",
 344                          sc->sc_bulkin_no, sc->sc_bulkout_no));
 345
 346                 /* Open the bulk pipes */
 347                 /* Bulk-in pipe */
 348                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkin_no, 0,
 349                                      &sc->sc_bulkin_pipe);
 350                 if (err) {
 351                         printf("%s: open bulk in error (addr %d): %s\n",
 352                                USBDEVNAME(sc->sc_dev), sc->sc_bulkin_no,
 353                                usbd_errstr(err));
 354                         error = EIO;
 355                         goto fail_0;
 356                 }
 357                 /* Bulk-out pipe */
 358                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkout_no,
 359                                      USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
 360                 if (err) {
 361                         printf("%s: open bulk out error (addr %d): %s\n",
 362                                USBDEVNAME(sc->sc_dev), sc->sc_bulkout_no,
 363                                usbd_errstr(err));
 364                         error = EIO;
 365                         goto fail_1;
 366                 }
 367
 368                 /* Allocate a request and an input buffer and start reading. */
 369                 sc->sc_ixfer = usbd_alloc_xfer(sc->sc_udev);
 370                 if (sc->sc_ixfer == NULL) {
 371                         error = ENOMEM;
 372                         goto fail_2;
 373                 }
 374
 375                 sc->sc_ibuf = usbd_alloc_buffer(sc->sc_ixfer,
 376                                                 sc->sc_ibufsizepad);
 377                 if (sc->sc_ibuf == NULL) {
 378                         error = ENOMEM;
 379                         goto fail_3;
 380                 }
 381
 382                 sc->sc_oxfer = usbd_alloc_xfer(sc->sc_udev);
 383                 if (sc->sc_oxfer == NULL) {
 384                         error = ENOMEM;
 385                         goto fail_3;
 386                 }
 387
 388                 sc->sc_obuf = usbd_alloc_buffer(sc->sc_oxfer,
 389                                                 sc->sc_obufsize +
 390                                                 sc->sc_opkthdrlen);
 391                 if (sc->sc_obuf == NULL) {
 392                         error = ENOMEM;
 393                         goto fail_4;
 394                 }
 395
 396                 /*
 397                  * Handle initial DCD.
 398                  */
 399                 if (ISSET(sc->sc_msr, UMSR_DCD) ||
 400                     (minor(dev) & UCOM_CALLOUT_MASK))
 401                         (*linesw[tp->t_line].l_modem)(tp, 1);
 402
 403                 ucomstartread(sc);
 404         }
 405
 406         sc->sc_opening = 0;
 407         wakeup(&sc->sc_opening);
 408         crit_exit();
 409
 410         error = ttyopen(dev, tp);
 411         if (error)
 412                 goto bad;
 413
 414         error = (*linesw[tp->t_line].l_open)(dev, tp);
 415         if (error)
 416                 goto bad;
 417
 418         disc_optim(tp, &tp->t_termios, sc);
 419
 420         DPRINTF(("%s: ucomopen: success\n", USBDEVNAME(sc->sc_dev)));
 421
 422         sc->sc_poll = 1;
 423         sc->sc_refcnt++;
 424
 425         return (0);
 426
 427 fail_4:
 428         usbd_free_xfer(sc->sc_oxfer);
 429         sc->sc_oxfer = NULL;
 430 fail_3:
 431         usbd_free_xfer(sc->sc_ixfer);
 432         sc->sc_ixfer = NULL;
 433 fail_2:
 434         usbd_close_pipe(sc->sc_bulkout_pipe);
 435         sc->sc_bulkout_pipe = NULL;
 436 fail_1:
 437         usbd_close_pipe(sc->sc_bulkin_pipe);
 438         sc->sc_bulkin_pipe = NULL;
 439 fail_0:
 440         sc->sc_opening = 0;
 441         wakeup(&sc->sc_opening);
 442         crit_exit();
 443         return (error);
 444
 445 bad:
 446         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 447                 /*
 448                  * We failed to open the device, and nobody else had it opened.
 449                  * Clean up the state as appropriate.
 450                  */
 451                 ucom_cleanup(sc);
 452         }
 453
 454         DPRINTF(("%s: ucomopen: failed\n", USBDEVNAME(sc->sc_dev)));
 455
 456         return (error);
 457 }
 458
 459 static int
 460 ucomclose(dev_t dev, int flag, int mode, usb_proc_ptr p)
 461 {
 462         struct ucom_softc *sc;
 463         struct tty *tp;
 464
 465         USB_GET_SC(ucom, UCOMUNIT(dev), sc);
 466
 467         tp = sc->sc_tty;
 468
 469         DPRINTF(("%s: ucomclose: unit = %d\n",
 470                 USBDEVNAME(sc->sc_dev), UCOMUNIT(dev)));
 471
 472         if (!ISSET(tp->t_state, TS_ISOPEN))
 473                 goto quit;
 474
 475         crit_enter();
 476         (*linesw[tp->t_line].l_close)(tp, flag);
 477         disc_optim(tp, &tp->t_termios, sc);
 478         ttyclose(tp);
 479         crit_exit();
 480
 481         if (sc->sc_dying)
 482                 goto quit;
 483
 484         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 485                 /*
 486                  * Although we got a last close, the device may still be in
 487                  * use; e.g. if this was the dialout node, and there are still
 488                  * processes waiting for carrier on the non-dialout node.
 489                  */
 490                 ucom_cleanup(sc);
 491         }
 492
 493         if (sc->sc_callback->ucom_close != NULL)
 494                 sc->sc_callback->ucom_close(sc->sc_parent, sc->sc_portno);
 495
 496 quit:
 497         if (tp->t_dev) {
 498                 release_dev(tp->t_dev);
 499                 tp->t_dev = NULL;
 500         }
 501
 502         if (--sc->sc_refcnt < 0)
 503                 usb_detach_wakeup(USBDEV(sc->sc_dev));
 504
 505         return (0);
 506 }
 507
 508 static int
 509 ucomread(dev_t dev, struct uio *uio, int flag)
 510 {
 511         struct ucom_softc *sc;
 512         struct tty *tp;
 513         int error;
 514
 515         USB_GET_SC(ucom, UCOMUNIT(dev), sc);
 516         tp = sc->sc_tty;
 517
 518         DPRINTF(("ucomread: tp = %p, flag = 0x%x\n", tp, flag));
 519
 520         if (sc->sc_dying)
 521                 return (EIO);
 522
 523         error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
 524
 525         DPRINTF(("ucomread: error = %d\n", error));
 526
 527         return (error);
 528 }
 529
 530 static int
 531 ucomwrite(dev_t dev, struct uio *uio, int flag)
 532 {
 533         struct ucom_softc *sc;
 534         struct tty *tp;
 535         int error;
 536
 537         USB_GET_SC(ucom, UCOMUNIT(dev), sc);
 538         tp = sc->sc_tty;
 539
 540         DPRINTF(("ucomwrite: tp = %p, flag = 0x%x\n", tp, flag));
 541
 542         if (sc->sc_dying)
 543                 return (EIO);
 544
 545         error = (*linesw[tp->t_line].l_write)(tp, uio, flag);
 546
 547         DPRINTF(("ucomwrite: error = %d\n", error));
 548
 549         return (error);
 550 }
 551
 552 static int
 553 ucomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, usb_proc_ptr p)
 554 {
 555         struct ucom_softc *sc;
 556         struct tty *tp;
 557         int error;
 558         int d;
 559
 560         USB_GET_SC(ucom, UCOMUNIT(dev), sc);
 561         tp = sc->sc_tty;
 562
 563         if (sc->sc_dying)
 564                 return (EIO);
 565
 566         DPRINTF(("ucomioctl: cmd = 0x%08lx\n", cmd));
 567
 568         error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
 569         if (error != ENOIOCTL) {
 570                 DPRINTF(("ucomioctl: l_ioctl: error = %d\n", error));
 571                 return (error);
 572         }
 573
 574         crit_enter();
 575
 576         error = ttioctl(tp, cmd, data, flag);
 577         disc_optim(tp, &tp->t_termios, sc);
 578         if (error != ENOIOCTL) {
 579                 crit_exit();
 580                 DPRINTF(("ucomioctl: ttioctl: error = %d\n", error));
 581                 return (error);
 582         }
 583
 584         if (sc->sc_callback->ucom_ioctl != NULL) {
 585                 error = sc->sc_callback->ucom_ioctl(sc->sc_parent,
 586                                                     sc->sc_portno,
 587                                                     cmd, data, flag, p);
 588                 if (error >= 0) {
 589                         crit_exit();
 590                         return (error);
 591                 }
 592         }
 593
 594         error = 0;
 595
 596         DPRINTF(("ucomioctl: our cmd = 0x%08lx\n", cmd));
 597
 598         switch (cmd) {
 599         case TIOCSBRK:
 600                 DPRINTF(("ucomioctl: TIOCSBRK\n"));
 601                 ucom_break(sc, 1);
 602                 break;
 603         case TIOCCBRK:
 604                 DPRINTF(("ucomioctl: TIOCCBRK\n"));
 605                 ucom_break(sc, 0);
 606                 break;
 607
 608         case TIOCSDTR:
 609                 DPRINTF(("ucomioctl: TIOCSDTR\n"));
 610                 (void)ucomctl(sc, TIOCM_DTR, DMBIS);
 611                 break;
 612         case TIOCCDTR:
 613                 DPRINTF(("ucomioctl: TIOCCDTR\n"));
 614                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 615                 break;
 616
 617         case TIOCMSET:
 618                 d = *(int *)data;
 619                 DPRINTF(("ucomioctl: TIOCMSET, 0x%x\n", d));
 620                 (void)ucomctl(sc, d, DMSET);
 621                 break;
 622         case TIOCMBIS:
 623                 d = *(int *)data;
 624                 DPRINTF(("ucomioctl: TIOCMBIS, 0x%x\n", d));
 625                 (void)ucomctl(sc, d, DMBIS);
 626                 break;
 627         case TIOCMBIC:
 628                 d = *(int *)data;
 629                 DPRINTF(("ucomioctl: TIOCMBIC, 0x%x\n", d));
 630                 (void)ucomctl(sc, d, DMBIC);
 631                 break;
 632         case TIOCMGET:
 633                 d = ucomctl(sc, 0, DMGET);
 634                 DPRINTF(("ucomioctl: TIOCMGET, 0x%x\n", d));
 635                 *(int *)data = d;
 636                 break;
 637
 638         default:
 639                 DPRINTF(("ucomioctl: error: our cmd = 0x%08lx\n", cmd));
 640                 error = ENOTTY;
 641                 break;
 642         }
 643
 644         crit_exit();
 645
 646         return (error);
 647 }
 648
 649 Static int
 650 ucomctl(struct ucom_softc *sc, int bits, int how)
 651 {
 652         int     mcr;
 653         int     msr;
 654         int     onoff;
 655
 656         DPRINTF(("ucomctl: bits = 0x%x, how = %d\n", bits, how));
 657
 658         if (how == DMGET) {
 659                 SET(bits, TIOCM_LE);            /* always set TIOCM_LE bit */
 660                 DPRINTF(("ucomctl: DMGET: LE"));
 661
 662                 mcr = sc->sc_mcr;
 663                 if (ISSET(mcr, UMCR_DTR)) {
 664                         SET(bits, TIOCM_DTR);
 665                         DPRINTF((" DTR"));
 666                 }
 667                 if (ISSET(mcr, UMCR_RTS)) {
 668                         SET(bits, TIOCM_RTS);
 669                         DPRINTF((" RTS"));
 670                 }
 671
 672                 msr = sc->sc_msr;
 673                 if (ISSET(msr, UMSR_CTS)) {
 674                         SET(bits, TIOCM_CTS);
 675                         DPRINTF((" CTS"));
 676                 }
 677                 if (ISSET(msr, UMSR_DCD)) {
 678                         SET(bits, TIOCM_CD);
 679                         DPRINTF((" CD"));
 680                 }
 681                 if (ISSET(msr, UMSR_DSR)) {
 682                         SET(bits, TIOCM_DSR);
 683                         DPRINTF((" DSR"));
 684                 }
 685                 if (ISSET(msr, UMSR_RI)) {
 686                         SET(bits, TIOCM_RI);
 687                         DPRINTF((" RI"));
 688                 }
 689
 690                 DPRINTF(("\n"));
 691
 692                 return (bits);
 693         }
 694
 695         mcr = 0;
 696         if (ISSET(bits, TIOCM_DTR))
 697                 SET(mcr, UMCR_DTR);
 698         if (ISSET(bits, TIOCM_RTS))
 699                 SET(mcr, UMCR_RTS);
 700
 701         switch (how) {
 702         case DMSET:
 703                 sc->sc_mcr = mcr;
 704                 break;
 705         case DMBIS:
 706                 sc->sc_mcr |= mcr;
 707                 break;
 708         case DMBIC:
 709                 sc->sc_mcr &= ~mcr;
 710                 break;
 711         }
 712
 713         onoff = ISSET(sc->sc_mcr, UMCR_DTR) ? 1 : 0;
 714         ucom_dtr(sc, onoff);
 715
 716         onoff = ISSET(sc->sc_mcr, UMCR_RTS) ? 1 : 0;
 717         ucom_rts(sc, onoff);
 718
 719         return (0);
 720 }
 721
 722 Static void
 723 ucom_break(struct ucom_softc *sc, int onoff)
 724 {
 725         DPRINTF(("ucom_break: onoff = %d\n", onoff));
 726
 727         if (sc->sc_callback->ucom_set == NULL)
 728                 return;
 729         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 730                                   UCOM_SET_BREAK, onoff);
 731 }
 732
 733 Static void
 734 ucom_dtr(struct ucom_softc *sc, int onoff)
 735 {
 736         DPRINTF(("ucom_dtr: onoff = %d\n", onoff));
 737
 738         if (sc->sc_callback->ucom_set == NULL)
 739                 return;
 740         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 741                                   UCOM_SET_DTR, onoff);
 742 }
 743
 744 Static void
 745 ucom_rts(struct ucom_softc *sc, int onoff)
 746 {
 747         DPRINTF(("ucom_rts: onoff = %d\n", onoff));
 748
 749         if (sc->sc_callback->ucom_set == NULL)
 750                 return;
 751         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 752                                   UCOM_SET_RTS, onoff);
 753 }
 754
 755 void
 756 ucom_status_change(struct ucom_softc *sc)
 757 {
 758         struct tty *tp = sc->sc_tty;
 759         u_char old_msr;
 760         int onoff;
 761
 762         if (sc->sc_callback->ucom_get_status == NULL) {
 763                 sc->sc_lsr = 0;
 764                 sc->sc_msr = 0;
 765                 return;
 766         }
 767
 768         old_msr = sc->sc_msr;
 769         sc->sc_callback->ucom_get_status(sc->sc_parent, sc->sc_portno,
 770                                          &sc->sc_lsr, &sc->sc_msr);
 771         if (ISSET((sc->sc_msr ^ old_msr), UMSR_DCD)) {
 772                 if (sc->sc_poll == 0)
 773                         return;
 774                 onoff = ISSET(sc->sc_msr, UMSR_DCD) ? 1 : 0;
 775                 DPRINTF(("ucom_status_change: DCD changed to %d\n", onoff));
 776                 (*linesw[tp->t_line].l_modem)(tp, onoff);
 777         }
 778 }
 779
 780 Static int
 781 ucomparam(struct tty *tp, struct termios *t)
 782 {
 783         struct ucom_softc *sc;
 784         int error;
 785         usbd_status uerr;
 786
 787         USB_GET_SC(ucom, UCOMUNIT(tp->t_dev), sc);
 788
 789         if (sc->sc_dying)
 790                 return (EIO);
 791
 792         DPRINTF(("ucomparam: sc = %p\n", sc));
 793
 794         /* Check requested parameters. */
 795         if (t->c_ospeed < 0) {
 796                 DPRINTF(("ucomparam: negative ospeed\n"));
 797                 return (EINVAL);
 798         }
 799         if (t->c_ispeed && t->c_ispeed != t->c_ospeed) {
 800                 DPRINTF(("ucomparam: mismatch ispeed and ospeed\n"));
 801                 return (EINVAL);
 802         }
 803
 804         /*
 805          * If there were no changes, don't do anything.  This avoids dropping
 806          * input and improves performance when all we did was frob things like
 807          * VMIN and VTIME.
 808          */
 809         if (tp->t_ospeed == t->c_ospeed &&
 810             tp->t_cflag == t->c_cflag)
 811                 return (0);
 812
 813         /* And copy to tty. */
 814         tp->t_ispeed = 0;
 815         tp->t_ospeed = t->c_ospeed;
 816         tp->t_cflag = t->c_cflag;
 817
 818         if (sc->sc_callback->ucom_param == NULL)
 819                 return (0);
 820
 821         ucomstopread(sc);
 822
 823         error = sc->sc_callback->ucom_param(sc->sc_parent, sc->sc_portno, t);
 824         if (error) {
 825                 DPRINTF(("ucomparam: callback: error = %d\n", error));
 826                 return (error);
 827         }
 828
 829         ttsetwater(tp);
 830
 831         if (t->c_cflag & CRTS_IFLOW) {
 832                 sc->sc_state |= UCS_RTS_IFLOW;
 833         } else if (sc->sc_state & UCS_RTS_IFLOW) {
 834                 sc->sc_state &= ~UCS_RTS_IFLOW;
 835                 (void)ucomctl(sc, UMCR_RTS, DMBIS);
 836         }
 837
 838         disc_optim(tp, t, sc);
 839
 840         uerr = ucomstartread(sc);
 841         if (uerr != USBD_NORMAL_COMPLETION)
 842                 return (EIO);
 843
 844         return (0);
 845 }
 846
 847 Static void
 848 ucomstart(struct tty *tp)
 849 {
 850         struct ucom_softc *sc;
 851         struct cblock *cbp;
 852         usbd_status err;
 853         u_char *data;
 854         int cnt;
 855
 856         USB_GET_SC(ucom, UCOMUNIT(tp->t_dev), sc);
 857         DPRINTF(("ucomstart: sc = %p\n", sc));
 858
 859         if (sc->sc_dying)
 860                 return;
 861
 862         crit_enter();
 863
 864         if (tp->t_state & TS_TBLOCK) {
 865                 if (ISSET(sc->sc_mcr, UMCR_RTS) &&
 866                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 867                         DPRINTF(("ucomstart: clear RTS\n"));
 868                         (void)ucomctl(sc, UMCR_RTS, DMBIC);
 869                 }
 870         } else {
 871                 if (!ISSET(sc->sc_mcr, UMCR_RTS) &&
 872                     tp->t_rawq.c_cc <= tp->t_ilowat &&
 873                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 874                         DPRINTF(("ucomstart: set RTS\n"));
 875                         (void)ucomctl(sc, UMCR_RTS, DMBIS);
 876                 }
 877         }
 878
 879         if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) {
 880                 ttwwakeup(tp);
 881                 DPRINTF(("ucomstart: stopped\n"));
 882                 goto out;
 883         }
 884
 885         if (tp->t_outq.c_cc <= tp->t_olowat) {
 886                 if (ISSET(tp->t_state, TS_SO_OLOWAT)) {
 887                         CLR(tp->t_state, TS_SO_OLOWAT);
 888                         wakeup(TSA_OLOWAT(tp));
 889                 }
 890                 selwakeuppri(&tp->t_wsel, TTIPRI);
 891                 if (tp->t_outq.c_cc == 0) {
 892                         if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
 893                             TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
 894                                 CLR(tp->t_state, TS_SO_OCOMPLETE);
 895                                 wakeup(TSA_OCOMPLETE(tp));
 896                         }
 897                         goto out;
 898                 }
 899         }
 900
 901         /* Grab the first contiguous region of buffer space. */
 902         data = tp->t_outq.c_cf;
 903         cbp = (struct cblock *) ((intptr_t) tp->t_outq.c_cf & ~CROUND);
 904         cnt = min((char *) (cbp+1) - tp->t_outq.c_cf, tp->t_outq.c_cc);
 905
 906         if (cnt == 0) {
 907                 DPRINTF(("ucomstart: cnt == 0\n"));
 908                 goto out;
 909         }
 910
 911         SET(tp->t_state, TS_BUSY);
 912
 913         if (cnt > sc->sc_obufsize) {
 914                 DPRINTF(("ucomstart: big buffer %d chars\n", cnt));
 915                 cnt = sc->sc_obufsize;
 916         }
 917         if (sc->sc_callback->ucom_write != NULL)
 918                 sc->sc_callback->ucom_write(sc->sc_parent, sc->sc_portno,
 919                                             sc->sc_obuf, data, &cnt);
 920         else
 921                 memcpy(sc->sc_obuf, data, cnt);
 922
 923         DPRINTF(("ucomstart: %d chars\n", cnt));
 924         usbd_setup_xfer(sc->sc_oxfer, sc->sc_bulkout_pipe,
 925                         (usbd_private_handle)sc, sc->sc_obuf, cnt,
 926                         USBD_NO_COPY, USBD_NO_TIMEOUT, ucomwritecb);
 927         /* What can we do on error? */
 928         err = usbd_transfer(sc->sc_oxfer);
 929         if (err != USBD_IN_PROGRESS)
 930                 printf("ucomstart: err=%s\n", usbd_errstr(err));
 931
 932         ttwwakeup(tp);
 933
 934     out:
 935         crit_exit();
 936 }
 937
 938 Static void
 939 ucomstop(struct tty *tp, int flag)
 940 {
 941         struct ucom_softc *sc;
 942
 943         USB_GET_SC(ucom, UCOMUNIT(tp->t_dev), sc);
 944
 945         DPRINTF(("ucomstop: %d\n", flag));
 946
 947         if (flag & FREAD) {
 948                 /*
 949                  * This is just supposed to flush pending receive data,
 950                  * not stop the reception of data entirely!
 951                  */
 952                 DPRINTF(("ucomstop: read\n"));
 953                 ucomstopread(sc);
 954                 ucomstartread(sc);
 955         }
 956
 957         if (flag & FWRITE) {
 958                 DPRINTF(("ucomstop: write\n"));
 959                 crit_enter();
 960                 if (ISSET(tp->t_state, TS_BUSY)) {
 961                         /* XXX do what? */
 962                         if (!ISSET(tp->t_state, TS_TTSTOP))
 963                                 SET(tp->t_state, TS_FLUSH);
 964                 }
 965                 crit_exit();
 966         }
 967
 968         DPRINTF(("ucomstop: done\n"));
 969 }
 970
 971 Static void
 972 ucomwritecb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
 973 {
 974         struct ucom_softc *sc = (struct ucom_softc *)p;
 975         struct tty *tp = sc->sc_tty;
 976         u_int32_t cc;
 977
 978         DPRINTF(("ucomwritecb: status = %d\n", status));
 979
 980         if (status == USBD_CANCELLED || sc->sc_dying)
 981                 goto error;
 982
 983         if (status != USBD_NORMAL_COMPLETION) {
 984                 printf("%s: ucomwritecb: %s\n",
 985                        USBDEVNAME(sc->sc_dev), usbd_errstr(status));
 986                 if (status == USBD_STALLED)
 987                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
 988                 /*
 989                  * XXX.  We may need a flag to sequence ucomstopread() and
 990                  * ucomstartread() to handle the case where ucomstartread()
 991                  * is called after ucomstopread() but before the request has
 992                  * been properly canceled?
 993                  */
 994                 goto error;
 995         }
 996
 997         usbd_get_xfer_status(xfer, NULL, NULL, &cc, NULL);
 998         DPRINTF(("ucomwritecb: cc = %d\n", cc));
 999         if (cc <= sc->sc_opkthdrlen) {
1000                 printf("%s: sent size too small, cc = %d\n",
1001                         USBDEVNAME(sc->sc_dev), cc);
1002                 goto error;
1003         }
1004
1005         /* convert from USB bytes to tty bytes */
1006         cc -= sc->sc_opkthdrlen;
1007
1008         crit_enter();
1009         CLR(tp->t_state, TS_BUSY);
1010         if (ISSET(tp->t_state, TS_FLUSH))
1011                 CLR(tp->t_state, TS_FLUSH);
1012         else
1013                 ndflush(&tp->t_outq, cc);
1014         (*linesw[tp->t_line].l_start)(tp);
1015         crit_exit();
1016
1017         return;
1018
1019   error:
1020         crit_enter();
1021         CLR(tp->t_state, TS_BUSY);
1022         crit_exit();
1023         return;
1024 }
1025
1026 Static usbd_status
1027 ucomstartread(struct ucom_softc *sc)
1028 {
1029         usbd_status err;
1030
1031         DPRINTF(("ucomstartread: start\n"));
1032
1033         sc->sc_state &= ~UCS_RXSTOP;
1034
1035         if (sc->sc_bulkin_pipe == NULL)
1036                 return (USBD_NORMAL_COMPLETION);
1037
1038         usbd_setup_xfer(sc->sc_ixfer, sc->sc_bulkin_pipe,
1039                         (usbd_private_handle)sc,
1040                         sc->sc_ibuf, sc->sc_ibufsize,
1041                         USBD_SHORT_XFER_OK | USBD_NO_COPY,
1042                         USBD_NO_TIMEOUT, ucomreadcb);
1043
1044         err = usbd_transfer(sc->sc_ixfer);
1045         if (err != USBD_IN_PROGRESS) {
1046                 DPRINTF(("ucomstartread: err = %s\n", usbd_errstr(err)));
1047                 return (err);
1048         }
1049
1050         return (USBD_NORMAL_COMPLETION);
1051 }
1052
1053 Static void
1054 ucomreadcb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1055 {
1056         struct ucom_softc *sc = (struct ucom_softc *)p;
1057         struct tty *tp = sc->sc_tty;
1058         int (*rint) (int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1059         usbd_status err;
1060         u_int32_t cc;
1061         u_char *cp;
1062         int lostcc;
1063
1064         DPRINTF(("ucomreadcb: status = %d\n", status));
1065
1066         if (status != USBD_NORMAL_COMPLETION) {
1067                 if (!(sc->sc_state & UCS_RXSTOP))
1068                         printf("%s: ucomreadcb: %s\n",
1069                                USBDEVNAME(sc->sc_dev), usbd_errstr(status));
1070                 if (status == USBD_STALLED)
1071                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1072                 /* XXX we should restart after some delay. */
1073                 return;
1074         }
1075
1076         usbd_get_xfer_status(xfer, NULL, (void **)&cp, &cc, NULL);
1077         DPRINTF(("ucomreadcb: got %d chars, tp = %p\n", cc, tp));
1078         if (cc == 0)
1079                 goto resubmit;
1080
1081         if (sc->sc_callback->ucom_read != NULL) {
1082                 sc->sc_callback->ucom_read(sc->sc_parent, sc->sc_portno,
1083                                            &cp, &cc);
1084         }
1085
1086         if (cc > sc->sc_ibufsize) {
1087                 printf("%s: invalid receive data size, %d chars\n",
1088                         USBDEVNAME(sc->sc_dev), cc);
1089                 goto resubmit;
1090         }
1091         if (cc < 1)
1092                 goto resubmit;
1093
1094         crit_enter();
1095         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1096                 if (tp->t_rawq.c_cc + cc > tp->t_ihiwat
1097                     && (sc->sc_state & UCS_RTS_IFLOW
1098                         || tp->t_iflag & IXOFF)
1099                     && !(tp->t_state & TS_TBLOCK))
1100                         ttyblock(tp);
1101                 lostcc = b_to_q((char *)cp, cc, &tp->t_rawq);
1102                 tp->t_rawcc += cc;
1103                 if (sc->hotchar) {
1104                         while (cc) {
1105                                 if (*cp == sc->hotchar)
1106                                         break;
1107                                 --cc;
1108                                 ++cp;
1109                         }
1110                         if (cc)
1111                                 setsofttty();
1112                 }
1113                 ttwakeup(tp);
1114                 if (tp->t_state & TS_TTSTOP
1115                     && (tp->t_iflag & IXANY
1116                         || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1117                         tp->t_state &= ~TS_TTSTOP;
1118                         tp->t_lflag &= ~FLUSHO;
1119                         ucomstart(tp);
1120                 }
1121                 if (lostcc > 0)
1122                         printf("%s: lost %d chars\n", USBDEVNAME(sc->sc_dev),
1123                                lostcc);
1124         } else {
1125                 /* Give characters to tty layer. */
1126                 while (cc > 0) {
1127                         DPRINTFN(7, ("ucomreadcb: char = 0x%02x\n", *cp));
1128                         if ((*rint)(*cp, tp) == -1) {
1129                                 /* XXX what should we do? */
1130                                 printf("%s: lost %d chars\n",
1131                                        USBDEVNAME(sc->sc_dev), cc);
1132                                 break;
1133                         }
1134                         cc--;
1135                         cp++;
1136                 }
1137         }
1138         crit_exit();
1139
1140 resubmit:
1141         err = ucomstartread(sc);
1142         if (err) {
1143                 printf("%s: read start failed\n", USBDEVNAME(sc->sc_dev));
1144                 /* XXX what should we dow now? */
1145         }
1146
1147         if ((sc->sc_state & UCS_RTS_IFLOW) && !ISSET(sc->sc_mcr, UMCR_RTS)
1148             && !(tp->t_state & TS_TBLOCK))
1149                 ucomctl(sc, UMCR_RTS, DMBIS);
1150 }
1151
1152 Static void
1153 ucom_cleanup(struct ucom_softc *sc)
1154 {
1155         DPRINTF(("ucom_cleanup: closing pipes\n"));
1156
1157         ucom_shutdown(sc);
1158         if (sc->sc_bulkin_pipe != NULL) {
1159                 usbd_abort_pipe(sc->sc_bulkin_pipe);
1160                 usbd_close_pipe(sc->sc_bulkin_pipe);
1161                 sc->sc_bulkin_pipe = NULL;
1162         }
1163         if (sc->sc_bulkout_pipe != NULL) {
1164                 usbd_abort_pipe(sc->sc_bulkout_pipe);
1165                 usbd_close_pipe(sc->sc_bulkout_pipe);
1166                 sc->sc_bulkout_pipe = NULL;
1167         }
1168         if (sc->sc_ixfer != NULL) {
1169                 usbd_free_xfer(sc->sc_ixfer);
1170                 sc->sc_ixfer = NULL;
1171         }
1172         if (sc->sc_oxfer != NULL) {
1173                 usbd_free_xfer(sc->sc_oxfer);
1174                 sc->sc_oxfer = NULL;
1175         }
1176 }
1177
1178 Static void
1179 ucomstopread(struct ucom_softc *sc)
1180 {
1181         usbd_status err;
1182
1183         DPRINTF(("ucomstopread: enter\n"));
1184
1185         if (!(sc->sc_state & UCS_RXSTOP)) {
1186                 sc->sc_state |= UCS_RXSTOP;
1187                 if (sc->sc_bulkin_pipe == NULL) {
1188                         DPRINTF(("ucomstopread: bulkin pipe NULL\n"));
1189                         return;
1190                 }
1191                 err = usbd_abort_pipe(sc->sc_bulkin_pipe);
1192                 if (err) {
1193                         DPRINTF(("ucomstopread: err = %s\n",
1194                                  usbd_errstr(err)));
1195                 }
1196         }
1197
1198         DPRINTF(("ucomstopread: leave\n"));
1199 }
1200
1201 static void
1202 disc_optim(struct tty *tp, struct termios *t, struct ucom_softc *sc)
1203 {
1204         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
1205             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
1206             && (!(t->c_iflag & PARMRK)
1207                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
1208             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
1209             && linesw[tp->t_line].l_rint == ttyinput) {
1210                 DPRINTF(("disc_optim: bypass l_rint\n"));
1211                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
1212         } else {
1213                 DPRINTF(("disc_optim: can't bypass l_rint\n"));
1214                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
1215         }
1216         sc->hotchar = linesw[tp->t_line].l_hotchar;
1217 }