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 1.30 2007/08/07 11:30:03 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                         ttwakeup(tp);
 211                         ttwwakeup(tp);
 212                 }
 213         } else {
 214                 DPRINTF(("ucom_detach: no tty\n"));
 215                 return (0);
 216         }
 217
 218         crit_enter();
 219         if (--sc->sc_refcnt >= 0) {
 220                 /* Wait for processes to go away. */
 221                 usb_detach_wait(sc->sc_dev);
 222         }
 223         crit_exit();
 224
 225         unit = device_get_unit(sc->sc_dev);
 226         dev_ops_remove(&ucom_ops, UCOMUNIT_MASK, unit);
 227
 228         return (0);
 229 }
 230
 231 static void
 232 ucom_shutdown(struct ucom_softc *sc)
 233 {
 234         struct tty *tp = sc->sc_tty;
 235
 236         DPRINTF(("ucom_shutdown\n"));
 237         /*
 238          * Hang up if necessary.  Wait a bit, so the other side has time to
 239          * notice even if we immediately open the port again.
 240          */
 241         if (ISSET(tp->t_cflag, HUPCL)) {
 242                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 243                 (void)tsleep(sc, 0, "ucomsd", hz);
 244         }
 245 }
 246
 247 static int
 248 ucomopen(struct dev_open_args *ap)
 249 {
 250         cdev_t dev = ap->a_head.a_dev;
 251         int unit = UCOMUNIT(dev);
 252         struct ucom_softc *sc;
 253         usbd_status err;
 254         struct tty *tp;
 255         int error;
 256
 257         sc = devclass_get_softc(ucom_devclass, unit);
 258         if (sc == NULL)
 259                 return (ENXIO);
 260
 261         if (sc->sc_dying)
 262                 return (ENXIO);
 263
 264         tp = sc->sc_tty;
 265
 266         DPRINTF(("%s: ucomopen: tp = %p\n", device_get_nameunit(sc->sc_dev), tp));
 267
 268         if (ISSET(tp->t_state, TS_ISOPEN) &&
 269             ISSET(tp->t_state, TS_XCLUDE) &&
 270             suser_cred(ap->a_cred, 0)
 271         ) {
 272                 return (EBUSY);
 273         }
 274
 275         /*
 276          * Do the following iff this is a first open.
 277          */
 278         crit_enter();
 279         while (sc->sc_opening)
 280                 tsleep(&sc->sc_opening, 0, "ucomop", 0);
 281         sc->sc_opening = 1;
 282
 283         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 284                 struct termios t;
 285
 286                 sc->sc_poll = 0;
 287                 sc->sc_lsr = sc->sc_msr = sc->sc_mcr = 0;
 288
 289                 tp->t_dev = reference_dev(dev);
 290
 291                 /*
 292                  * Initialize the termios status to the defaults.  Add in the
 293                  * sticky bits from TIOCSFLAGS.
 294                  */
 295                 t.c_ispeed = 0;
 296                 t.c_ospeed = TTYDEF_SPEED;
 297                 t.c_cflag = TTYDEF_CFLAG;
 298                 /* Make sure ucomparam() will do something. */
 299                 tp->t_ospeed = 0;
 300                 (void)ucomparam(tp, &t);
 301                 tp->t_iflag = TTYDEF_IFLAG;
 302                 tp->t_oflag = TTYDEF_OFLAG;
 303                 tp->t_lflag = TTYDEF_LFLAG;
 304                 ttychars(tp);
 305                 ttsetwater(tp);
 306
 307                 /*
 308                  * Turn on DTR.  We must always do this, even if carrier is not
 309                  * present, because otherwise we'd have to use TIOCSDTR
 310                  * immediately after setting CLOCAL, which applications do not
 311                  * expect.  We always assert DTR while the device is open
 312                  * unless explicitly requested to deassert it.
 313                  */
 314                 (void)ucomctl(sc, TIOCM_DTR | TIOCM_RTS, DMBIS);
 315
 316                 /* Device specific open */
 317                 if (sc->sc_callback->ucom_open != NULL) {
 318                         error = sc->sc_callback->ucom_open(sc->sc_parent,
 319                                                            sc->sc_portno);
 320                         if (error) {
 321                                 ucom_cleanup(sc);
 322                                 sc->sc_opening = 0;
 323                                 wakeup(&sc->sc_opening);
 324                                 crit_exit();
 325                                 return (error);
 326                         }
 327                 }
 328
 329                 DPRINTF(("ucomopen: open pipes in = %d out = %d\n",
 330                          sc->sc_bulkin_no, sc->sc_bulkout_no));
 331
 332                 /* Open the bulk pipes */
 333                 /* Bulk-in pipe */
 334                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkin_no, 0,
 335                                      &sc->sc_bulkin_pipe);
 336                 if (err) {
 337                         kprintf("%s: open bulk in error (addr %d): %s\n",
 338                                device_get_nameunit(sc->sc_dev), sc->sc_bulkin_no,
 339                                usbd_errstr(err));
 340                         error = EIO;
 341                         goto fail_0;
 342                 }
 343                 /* Bulk-out pipe */
 344                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkout_no,
 345                                      USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
 346                 if (err) {
 347                         kprintf("%s: open bulk out error (addr %d): %s\n",
 348                                device_get_nameunit(sc->sc_dev), sc->sc_bulkout_no,
 349                                usbd_errstr(err));
 350                         error = EIO;
 351                         goto fail_1;
 352                 }
 353
 354                 /* Allocate a request and an input buffer and start reading. */
 355                 sc->sc_ixfer = usbd_alloc_xfer(sc->sc_udev);
 356                 if (sc->sc_ixfer == NULL) {
 357                         error = ENOMEM;
 358                         goto fail_2;
 359                 }
 360
 361                 sc->sc_ibuf = usbd_alloc_buffer(sc->sc_ixfer,
 362                                                 sc->sc_ibufsizepad);
 363                 if (sc->sc_ibuf == NULL) {
 364                         error = ENOMEM;
 365                         goto fail_3;
 366                 }
 367
 368                 sc->sc_oxfer = usbd_alloc_xfer(sc->sc_udev);
 369                 if (sc->sc_oxfer == NULL) {
 370                         error = ENOMEM;
 371                         goto fail_3;
 372                 }
 373
 374                 sc->sc_obuf = usbd_alloc_buffer(sc->sc_oxfer,
 375                                                 sc->sc_obufsize +
 376                                                 sc->sc_opkthdrlen);
 377                 if (sc->sc_obuf == NULL) {
 378                         error = ENOMEM;
 379                         goto fail_4;
 380                 }
 381
 382                 /*
 383                  * Handle initial DCD.
 384                  */
 385                 if (ISSET(sc->sc_msr, UMSR_DCD) ||
 386                     (minor(dev) & UCOM_CALLOUT_MASK))
 387                         (*linesw[tp->t_line].l_modem)(tp, 1);
 388
 389                 ucomstartread(sc);
 390         }
 391
 392         sc->sc_opening = 0;
 393         wakeup(&sc->sc_opening);
 394         crit_exit();
 395
 396         error = ttyopen(dev, tp);
 397         if (error)
 398                 goto bad;
 399
 400         error = (*linesw[tp->t_line].l_open)(dev, tp);
 401         if (error)
 402                 goto bad;
 403
 404         disc_optim(tp, &tp->t_termios, sc);
 405
 406         DPRINTF(("%s: ucomopen: success\n", device_get_nameunit(sc->sc_dev)));
 407
 408         sc->sc_poll = 1;
 409         sc->sc_refcnt++;
 410
 411         return (0);
 412
 413 fail_4:
 414         usbd_free_xfer(sc->sc_oxfer);
 415         sc->sc_oxfer = NULL;
 416 fail_3:
 417         usbd_free_xfer(sc->sc_ixfer);
 418         sc->sc_ixfer = NULL;
 419 fail_2:
 420         usbd_close_pipe(sc->sc_bulkout_pipe);
 421         sc->sc_bulkout_pipe = NULL;
 422 fail_1:
 423         usbd_close_pipe(sc->sc_bulkin_pipe);
 424         sc->sc_bulkin_pipe = NULL;
 425 fail_0:
 426         sc->sc_opening = 0;
 427         wakeup(&sc->sc_opening);
 428         crit_exit();
 429         return (error);
 430
 431 bad:
 432         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 433                 /*
 434                  * We failed to open the device, and nobody else had it opened.
 435                  * Clean up the state as appropriate.
 436                  */
 437                 ucom_cleanup(sc);
 438         }
 439
 440         DPRINTF(("%s: ucomopen: failed\n", device_get_nameunit(sc->sc_dev)));
 441
 442         return (error);
 443 }
 444
 445 static int
 446 ucomclose(struct dev_close_args *ap)
 447 {
 448         cdev_t dev = ap->a_head.a_dev;
 449         struct ucom_softc *sc;
 450         struct tty *tp;
 451
 452         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 453
 454         tp = sc->sc_tty;
 455
 456         DPRINTF(("%s: ucomclose: unit = %d\n",
 457                 device_get_nameunit(sc->sc_dev), UCOMUNIT(dev)));
 458
 459         if (!ISSET(tp->t_state, TS_ISOPEN))
 460                 goto quit;
 461
 462         crit_enter();
 463         (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 464         disc_optim(tp, &tp->t_termios, sc);
 465         ttyclose(tp);
 466         crit_exit();
 467
 468         if (sc->sc_dying)
 469                 goto quit;
 470
 471         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 472                 /*
 473                  * Although we got a last close, the device may still be in
 474                  * use; e.g. if this was the dialout node, and there are still
 475                  * processes waiting for carrier on the non-dialout node.
 476                  */
 477                 ucom_cleanup(sc);
 478         }
 479
 480         if (sc->sc_callback->ucom_close != NULL)
 481                 sc->sc_callback->ucom_close(sc->sc_parent, sc->sc_portno);
 482
 483 quit:
 484         if (tp->t_dev) {
 485                 release_dev(tp->t_dev);
 486                 tp->t_dev = NULL;
 487         }
 488
 489         if (--sc->sc_refcnt < 0)
 490                 usb_detach_wakeup(sc->sc_dev);
 491
 492         return (0);
 493 }
 494
 495 static int
 496 ucomread(struct dev_read_args *ap)
 497 {
 498         cdev_t dev = ap->a_head.a_dev;
 499         struct ucom_softc *sc;
 500         struct tty *tp;
 501         int error;
 502
 503         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 504         tp = sc->sc_tty;
 505
 506         DPRINTF(("ucomread: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 507
 508         if (sc->sc_dying)
 509                 return (EIO);
 510
 511         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 512
 513         DPRINTF(("ucomread: error = %d\n", error));
 514
 515         return (error);
 516 }
 517
 518 static int
 519 ucomwrite(struct dev_write_args *ap)
 520 {
 521         cdev_t dev = ap->a_head.a_dev;
 522         struct ucom_softc *sc;
 523         struct tty *tp;
 524         int error;
 525
 526         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 527         tp = sc->sc_tty;
 528
 529         DPRINTF(("ucomwrite: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 530
 531         if (sc->sc_dying)
 532                 return (EIO);
 533
 534         error = (*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag);
 535
 536         DPRINTF(("ucomwrite: error = %d\n", error));
 537
 538         return (error);
 539 }
 540
 541 static int
 542 ucomioctl(struct dev_ioctl_args *ap)
 543 {
 544         cdev_t dev = ap->a_head.a_dev;
 545         struct ucom_softc *sc;
 546         struct tty *tp;
 547         int error;
 548         int d;
 549
 550         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 551         tp = sc->sc_tty;
 552
 553         if (sc->sc_dying)
 554                 return (EIO);
 555
 556         DPRINTF(("ucomioctl: cmd = 0x%08lx\n", ap->a_cmd));
 557
 558         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 559                                               ap->a_fflag, ap->a_cred);
 560         if (error != ENOIOCTL) {
 561                 DPRINTF(("ucomioctl: l_ioctl: error = %d\n", error));
 562                 return (error);
 563         }
 564
 565         crit_enter();
 566
 567         error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 568         disc_optim(tp, &tp->t_termios, sc);
 569         if (error != ENOIOCTL) {
 570                 crit_exit();
 571                 DPRINTF(("ucomioctl: ttioctl: error = %d\n", error));
 572                 return (error);
 573         }
 574
 575         if (sc->sc_callback->ucom_ioctl != NULL) {
 576                 error = sc->sc_callback->ucom_ioctl(sc->sc_parent,
 577                                                     sc->sc_portno,
 578                                                     ap->a_cmd, ap->a_data,
 579                                                     ap->a_fflag, curthread);
 580                 if (error >= 0) {
 581                         crit_exit();
 582                         return (error);
 583                 }
 584         }
 585
 586         error = 0;
 587
 588         DPRINTF(("ucomioctl: our cmd = 0x%08lx\n", ap->a_cmd));
 589
 590         switch (ap->a_cmd) {
 591         case TIOCSBRK:
 592                 DPRINTF(("ucomioctl: TIOCSBRK\n"));
 593                 ucom_break(sc, 1);
 594                 break;
 595         case TIOCCBRK:
 596                 DPRINTF(("ucomioctl: TIOCCBRK\n"));
 597                 ucom_break(sc, 0);
 598                 break;
 599
 600         case TIOCSDTR:
 601                 DPRINTF(("ucomioctl: TIOCSDTR\n"));
 602                 (void)ucomctl(sc, TIOCM_DTR, DMBIS);
 603                 break;
 604         case TIOCCDTR:
 605                 DPRINTF(("ucomioctl: TIOCCDTR\n"));
 606                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 607                 break;
 608
 609         case TIOCMSET:
 610                 d = *(int *)ap->a_data;
 611                 DPRINTF(("ucomioctl: TIOCMSET, 0x%x\n", d));
 612                 (void)ucomctl(sc, d, DMSET);
 613                 break;
 614         case TIOCMBIS:
 615                 d = *(int *)ap->a_data;
 616                 DPRINTF(("ucomioctl: TIOCMBIS, 0x%x\n", d));
 617                 (void)ucomctl(sc, d, DMBIS);
 618                 break;
 619         case TIOCMBIC:
 620                 d = *(int *)ap->a_data;
 621                 DPRINTF(("ucomioctl: TIOCMBIC, 0x%x\n", d));
 622                 (void)ucomctl(sc, d, DMBIC);
 623                 break;
 624         case TIOCMGET:
 625                 d = ucomctl(sc, 0, DMGET);
 626                 DPRINTF(("ucomioctl: TIOCMGET, 0x%x\n", d));
 627                 *(int *)ap->a_data = d;
 628                 break;
 629
 630         default:
 631                 DPRINTF(("ucomioctl: error: our cmd = 0x%08lx\n", ap->a_cmd));
 632                 error = ENOTTY;
 633                 break;
 634         }
 635
 636         crit_exit();
 637
 638         return (error);
 639 }
 640
 641 static int
 642 ucomctl(struct ucom_softc *sc, int bits, int how)
 643 {
 644         int     mcr;
 645         int     msr;
 646         int     onoff;
 647
 648         DPRINTF(("ucomctl: bits = 0x%x, how = %d\n", bits, how));
 649
 650         if (how == DMGET) {
 651                 SET(bits, TIOCM_LE);            /* always set TIOCM_LE bit */
 652                 DPRINTF(("ucomctl: DMGET: LE"));
 653
 654                 mcr = sc->sc_mcr;
 655                 if (ISSET(mcr, UMCR_DTR)) {
 656                         SET(bits, TIOCM_DTR);
 657                         DPRINTF((" DTR"));
 658                 }
 659                 if (ISSET(mcr, UMCR_RTS)) {
 660                         SET(bits, TIOCM_RTS);
 661                         DPRINTF((" RTS"));
 662                 }
 663
 664                 msr = sc->sc_msr;
 665                 if (ISSET(msr, UMSR_CTS)) {
 666                         SET(bits, TIOCM_CTS);
 667                         DPRINTF((" CTS"));
 668                 }
 669                 if (ISSET(msr, UMSR_DCD)) {
 670                         SET(bits, TIOCM_CD);
 671                         DPRINTF((" CD"));
 672                 }
 673                 if (ISSET(msr, UMSR_DSR)) {
 674                         SET(bits, TIOCM_DSR);
 675                         DPRINTF((" DSR"));
 676                 }
 677                 if (ISSET(msr, UMSR_RI)) {
 678                         SET(bits, TIOCM_RI);
 679                         DPRINTF((" RI"));
 680                 }
 681
 682                 DPRINTF(("\n"));
 683
 684                 return (bits);
 685         }
 686
 687         mcr = 0;
 688         if (ISSET(bits, TIOCM_DTR))
 689                 SET(mcr, UMCR_DTR);
 690         if (ISSET(bits, TIOCM_RTS))
 691                 SET(mcr, UMCR_RTS);
 692
 693         switch (how) {
 694         case DMSET:
 695                 sc->sc_mcr = mcr;
 696                 break;
 697         case DMBIS:
 698                 sc->sc_mcr |= mcr;
 699                 break;
 700         case DMBIC:
 701                 sc->sc_mcr &= ~mcr;
 702                 break;
 703         }
 704
 705         onoff = ISSET(sc->sc_mcr, UMCR_DTR) ? 1 : 0;
 706         ucom_dtr(sc, onoff);
 707
 708         onoff = ISSET(sc->sc_mcr, UMCR_RTS) ? 1 : 0;
 709         ucom_rts(sc, onoff);
 710
 711         return (0);
 712 }
 713
 714 static void
 715 ucom_break(struct ucom_softc *sc, int onoff)
 716 {
 717         DPRINTF(("ucom_break: onoff = %d\n", onoff));
 718
 719         if (sc->sc_callback->ucom_set == NULL)
 720                 return;
 721         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 722                                   UCOM_SET_BREAK, onoff);
 723 }
 724
 725 static void
 726 ucom_dtr(struct ucom_softc *sc, int onoff)
 727 {
 728         DPRINTF(("ucom_dtr: onoff = %d\n", onoff));
 729
 730         if (sc->sc_callback->ucom_set == NULL)
 731                 return;
 732         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 733                                   UCOM_SET_DTR, onoff);
 734 }
 735
 736 static void
 737 ucom_rts(struct ucom_softc *sc, int onoff)
 738 {
 739         DPRINTF(("ucom_rts: onoff = %d\n", onoff));
 740
 741         if (sc->sc_callback->ucom_set == NULL)
 742                 return;
 743         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 744                                   UCOM_SET_RTS, onoff);
 745 }
 746
 747 void
 748 ucom_status_change(struct ucom_softc *sc)
 749 {
 750         struct tty *tp = sc->sc_tty;
 751         u_char old_msr;
 752         int onoff;
 753
 754         if (sc->sc_callback->ucom_get_status == NULL) {
 755                 sc->sc_lsr = 0;
 756                 sc->sc_msr = 0;
 757                 return;
 758         }
 759
 760         old_msr = sc->sc_msr;
 761         sc->sc_callback->ucom_get_status(sc->sc_parent, sc->sc_portno,
 762                                          &sc->sc_lsr, &sc->sc_msr);
 763         if (ISSET((sc->sc_msr ^ old_msr), UMSR_DCD)) {
 764                 if (sc->sc_poll == 0)
 765                         return;
 766                 onoff = ISSET(sc->sc_msr, UMSR_DCD) ? 1 : 0;
 767                 DPRINTF(("ucom_status_change: DCD changed to %d\n", onoff));
 768                 (*linesw[tp->t_line].l_modem)(tp, onoff);
 769         }
 770 }
 771
 772 static int
 773 ucomparam(struct tty *tp, struct termios *t)
 774 {
 775         struct ucom_softc *sc;
 776         int error;
 777         usbd_status uerr;
 778
 779         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 780
 781         if (sc->sc_dying)
 782                 return (EIO);
 783
 784         DPRINTF(("ucomparam: sc = %p\n", sc));
 785
 786         /* Check requested parameters. */
 787         if (t->c_ospeed < 0) {
 788                 DPRINTF(("ucomparam: negative ospeed\n"));
 789                 return (EINVAL);
 790         }
 791         if (t->c_ispeed && t->c_ispeed != t->c_ospeed) {
 792                 DPRINTF(("ucomparam: mismatch ispeed and ospeed\n"));
 793                 return (EINVAL);
 794         }
 795
 796         /*
 797          * If there were no changes, don't do anything.  This avoids dropping
 798          * input and improves performance when all we did was frob things like
 799          * VMIN and VTIME.
 800          */
 801         if (tp->t_ospeed == t->c_ospeed &&
 802             tp->t_cflag == t->c_cflag)
 803                 return (0);
 804
 805         /* And copy to tty. */
 806         tp->t_ispeed = 0;
 807         tp->t_ospeed = t->c_ospeed;
 808         tp->t_cflag = t->c_cflag;
 809
 810         if (sc->sc_callback->ucom_param == NULL)
 811                 return (0);
 812
 813         ucomstopread(sc);
 814
 815         error = sc->sc_callback->ucom_param(sc->sc_parent, sc->sc_portno, t);
 816         if (error) {
 817                 DPRINTF(("ucomparam: callback: error = %d\n", error));
 818                 return (error);
 819         }
 820
 821         ttsetwater(tp);
 822
 823         if (t->c_cflag & CRTS_IFLOW) {
 824                 sc->sc_state |= UCS_RTS_IFLOW;
 825         } else if (sc->sc_state & UCS_RTS_IFLOW) {
 826                 sc->sc_state &= ~UCS_RTS_IFLOW;
 827                 (void)ucomctl(sc, UMCR_RTS, DMBIS);
 828         }
 829
 830         disc_optim(tp, t, sc);
 831
 832         uerr = ucomstartread(sc);
 833         if (uerr != USBD_NORMAL_COMPLETION)
 834                 return (EIO);
 835
 836         return (0);
 837 }
 838
 839 static void
 840 ucomstart(struct tty *tp)
 841 {
 842         struct ucom_softc *sc;
 843         struct cblock *cbp;
 844         usbd_status err;
 845         u_char *data;
 846         int cnt;
 847
 848         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 849         DPRINTF(("ucomstart: sc = %p\n", sc));
 850
 851         if (sc->sc_dying)
 852                 return;
 853
 854         crit_enter();
 855
 856         if (tp->t_state & TS_TBLOCK) {
 857                 if (ISSET(sc->sc_mcr, UMCR_RTS) &&
 858                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 859                         DPRINTF(("ucomstart: clear RTS\n"));
 860                         (void)ucomctl(sc, UMCR_RTS, DMBIC);
 861                 }
 862         } else {
 863                 if (!ISSET(sc->sc_mcr, UMCR_RTS) &&
 864                     tp->t_rawq.c_cc <= tp->t_ilowat &&
 865                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 866                         DPRINTF(("ucomstart: set RTS\n"));
 867                         (void)ucomctl(sc, UMCR_RTS, DMBIS);
 868                 }
 869         }
 870
 871         if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) {
 872                 ttwwakeup(tp);
 873                 DPRINTF(("ucomstart: stopped\n"));
 874                 goto out;
 875         }
 876
 877         if (tp->t_outq.c_cc <= tp->t_olowat) {
 878                 if (ISSET(tp->t_state, TS_SO_OLOWAT)) {
 879                         CLR(tp->t_state, TS_SO_OLOWAT);
 880                         wakeup(TSA_OLOWAT(tp));
 881                 }
 882                 selwakeup(&tp->t_wsel);
 883                 if (tp->t_outq.c_cc == 0) {
 884                         if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
 885                             TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
 886                                 CLR(tp->t_state, TS_SO_OCOMPLETE);
 887                                 wakeup(TSA_OCOMPLETE(tp));
 888                         }
 889                         goto out;
 890                 }
 891         }
 892
 893         /* Grab the first contiguous region of buffer space. */
 894         data = tp->t_outq.c_cf;
 895         cbp = (struct cblock *) ((intptr_t) tp->t_outq.c_cf & ~CROUND);
 896         cnt = min((char *) (cbp+1) - tp->t_outq.c_cf, tp->t_outq.c_cc);
 897
 898         if (cnt == 0) {
 899                 DPRINTF(("ucomstart: cnt == 0\n"));
 900                 goto out;
 901         }
 902
 903         SET(tp->t_state, TS_BUSY);
 904
 905         if (cnt > sc->sc_obufsize) {
 906                 DPRINTF(("ucomstart: big buffer %d chars\n", cnt));
 907                 cnt = sc->sc_obufsize;
 908         }
 909         if (sc->sc_callback->ucom_write != NULL)
 910                 sc->sc_callback->ucom_write(sc->sc_parent, sc->sc_portno,
 911                                             sc->sc_obuf, data, &cnt);
 912         else
 913                 memcpy(sc->sc_obuf, data, cnt);
 914
 915         DPRINTF(("ucomstart: %d chars\n", cnt));
 916         usbd_setup_xfer(sc->sc_oxfer, sc->sc_bulkout_pipe,
 917                         (usbd_private_handle)sc, sc->sc_obuf, cnt,
 918                         USBD_NO_COPY, USBD_NO_TIMEOUT, ucomwritecb);
 919         /* What can we do on error? */
 920         err = usbd_transfer(sc->sc_oxfer);
 921         if (err != USBD_IN_PROGRESS)
 922                 kprintf("ucomstart: err=%s\n", usbd_errstr(err));
 923
 924         ttwwakeup(tp);
 925
 926     out:
 927         crit_exit();
 928 }
 929
 930 static void
 931 ucomstop(struct tty *tp, int flag)
 932 {
 933         struct ucom_softc *sc;
 934
 935         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 936
 937         DPRINTF(("ucomstop: %d\n", flag));
 938
 939         if (flag & FREAD) {
 940                 /*
 941                  * This is just supposed to flush pending receive data,
 942                  * not stop the reception of data entirely!
 943                  */
 944                 DPRINTF(("ucomstop: read\n"));
 945                 ucomstopread(sc);
 946                 ucomstartread(sc);
 947         }
 948
 949         if (flag & FWRITE) {
 950                 DPRINTF(("ucomstop: write\n"));
 951                 crit_enter();
 952                 if (ISSET(tp->t_state, TS_BUSY)) {
 953                         /* XXX do what? */
 954                         if (!ISSET(tp->t_state, TS_TTSTOP))
 955                                 SET(tp->t_state, TS_FLUSH);
 956                 }
 957                 crit_exit();
 958         }
 959
 960         DPRINTF(("ucomstop: done\n"));
 961 }
 962
 963 static void
 964 ucomwritecb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
 965 {
 966         struct ucom_softc *sc = (struct ucom_softc *)p;
 967         struct tty *tp = sc->sc_tty;
 968         u_int32_t cc;
 969
 970         DPRINTF(("ucomwritecb: status = %d\n", status));
 971
 972         if (status == USBD_CANCELLED || sc->sc_dying)
 973                 goto error;
 974
 975         if (status != USBD_NORMAL_COMPLETION) {
 976                 kprintf("%s: ucomwritecb: %s\n",
 977                        device_get_nameunit(sc->sc_dev), usbd_errstr(status));
 978                 if (status == USBD_STALLED)
 979                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
 980                 /*
 981                  * XXX.  We may need a flag to sequence ucomstopread() and
 982                  * ucomstartread() to handle the case where ucomstartread()
 983                  * is called after ucomstopread() but before the request has
 984                  * been properly canceled?
 985                  */
 986                 goto error;
 987         }
 988
 989         usbd_get_xfer_status(xfer, NULL, NULL, &cc, NULL);
 990         DPRINTF(("ucomwritecb: cc = %d\n", cc));
 991         if (cc <= sc->sc_opkthdrlen) {
 992                 kprintf("%s: sent size too small, cc = %d\n",
 993                         device_get_nameunit(sc->sc_dev), cc);
 994                 goto error;
 995         }
 996
 997         /* convert from USB bytes to tty bytes */
 998         cc -= sc->sc_opkthdrlen;
 999
1000         crit_enter();
1001         CLR(tp->t_state, TS_BUSY);
1002         if (ISSET(tp->t_state, TS_FLUSH))
1003                 CLR(tp->t_state, TS_FLUSH);
1004         else
1005                 ndflush(&tp->t_outq, cc);
1006         (*linesw[tp->t_line].l_start)(tp);
1007         crit_exit();
1008
1009         return;
1010
1011   error:
1012         crit_enter();
1013         CLR(tp->t_state, TS_BUSY);
1014         crit_exit();
1015         return;
1016 }
1017
1018 static usbd_status
1019 ucomstartread(struct ucom_softc *sc)
1020 {
1021         usbd_status err;
1022
1023         DPRINTF(("ucomstartread: start\n"));
1024
1025         sc->sc_state &= ~UCS_RXSTOP;
1026
1027         if (sc->sc_bulkin_pipe == NULL)
1028                 return (USBD_NORMAL_COMPLETION);
1029
1030         usbd_setup_xfer(sc->sc_ixfer, sc->sc_bulkin_pipe,
1031                         (usbd_private_handle)sc,
1032                         sc->sc_ibuf, sc->sc_ibufsize,
1033                         USBD_SHORT_XFER_OK | USBD_NO_COPY,
1034                         USBD_NO_TIMEOUT, ucomreadcb);
1035
1036         err = usbd_transfer(sc->sc_ixfer);
1037         if (err != USBD_IN_PROGRESS) {
1038                 DPRINTF(("ucomstartread: err = %s\n", usbd_errstr(err)));
1039                 return (err);
1040         }
1041
1042         return (USBD_NORMAL_COMPLETION);
1043 }
1044
1045 static void
1046 ucomreadcb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1047 {
1048         struct ucom_softc *sc = (struct ucom_softc *)p;
1049         struct tty *tp = sc->sc_tty;
1050         int (*rint) (int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1051         usbd_status err;
1052         u_int32_t cc;
1053         u_char *cp;
1054         int lostcc;
1055
1056         DPRINTF(("ucomreadcb: status = %d\n", status));
1057
1058         if (status != USBD_NORMAL_COMPLETION) {
1059                 if (!(sc->sc_state & UCS_RXSTOP))
1060                         kprintf("%s: ucomreadcb: %s\n",
1061                                device_get_nameunit(sc->sc_dev), usbd_errstr(status));
1062                 if (status == USBD_STALLED)
1063                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1064                 /* XXX we should restart after some delay. */
1065                 return;
1066         }
1067
1068         usbd_get_xfer_status(xfer, NULL, (void **)&cp, &cc, NULL);
1069         DPRINTF(("ucomreadcb: got %d chars, tp = %p\n", cc, tp));
1070         if (cc == 0)
1071                 goto resubmit;
1072
1073         if (sc->sc_callback->ucom_read != NULL) {
1074                 sc->sc_callback->ucom_read(sc->sc_parent, sc->sc_portno,
1075                                            &cp, &cc);
1076         }
1077
1078         if (cc > sc->sc_ibufsize) {
1079                 kprintf("%s: invalid receive data size, %d chars\n",
1080                         device_get_nameunit(sc->sc_dev), cc);
1081                 goto resubmit;
1082         }
1083         if (cc < 1)
1084                 goto resubmit;
1085
1086         crit_enter();
1087         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1088                 if (tp->t_rawq.c_cc + cc > tp->t_ihiwat
1089                     && (sc->sc_state & UCS_RTS_IFLOW
1090                         || tp->t_iflag & IXOFF)
1091                     && !(tp->t_state & TS_TBLOCK))
1092                         ttyblock(tp);
1093                 lostcc = b_to_q((char *)cp, cc, &tp->t_rawq);
1094                 tp->t_rawcc += cc;
1095                 if (sc->hotchar) {
1096                         while (cc) {
1097                                 if (*cp == sc->hotchar)
1098                                         break;
1099                                 --cc;
1100                                 ++cp;
1101                         }
1102                         if (cc)
1103                                 setsofttty();
1104                 }
1105                 ttwakeup(tp);
1106                 if (tp->t_state & TS_TTSTOP
1107                     && (tp->t_iflag & IXANY
1108                         || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1109                         tp->t_state &= ~TS_TTSTOP;
1110                         tp->t_lflag &= ~FLUSHO;
1111                         ucomstart(tp);
1112                 }
1113                 if (lostcc > 0)
1114                         kprintf("%s: lost %d chars\n", device_get_nameunit(sc->sc_dev),
1115                                lostcc);
1116         } else {
1117                 /* Give characters to tty layer. */
1118                 while (cc > 0) {
1119                         DPRINTFN(7, ("ucomreadcb: char = 0x%02x\n", *cp));
1120                         if ((*rint)(*cp, tp) == -1) {
1121                                 /* XXX what should we do? */
1122                                 kprintf("%s: lost %d chars\n",
1123                                        device_get_nameunit(sc->sc_dev), cc);
1124                                 break;
1125                         }
1126                         cc--;
1127                         cp++;
1128                 }
1129         }
1130         crit_exit();
1131
1132 resubmit:
1133         err = ucomstartread(sc);
1134         if (err) {
1135                 kprintf("%s: read start failed\n", device_get_nameunit(sc->sc_dev));
1136                 /* XXX what should we dow now? */
1137         }
1138
1139         if ((sc->sc_state & UCS_RTS_IFLOW) && !ISSET(sc->sc_mcr, UMCR_RTS)
1140             && !(tp->t_state & TS_TBLOCK))
1141                 ucomctl(sc, UMCR_RTS, DMBIS);
1142 }
1143
1144 static void
1145 ucom_cleanup(struct ucom_softc *sc)
1146 {
1147         DPRINTF(("ucom_cleanup: closing pipes\n"));
1148
1149         ucom_shutdown(sc);
1150         if (sc->sc_bulkin_pipe != NULL) {
1151                 usbd_abort_pipe(sc->sc_bulkin_pipe);
1152                 usbd_close_pipe(sc->sc_bulkin_pipe);
1153                 sc->sc_bulkin_pipe = NULL;
1154         }
1155         if (sc->sc_bulkout_pipe != NULL) {
1156                 usbd_abort_pipe(sc->sc_bulkout_pipe);
1157                 usbd_close_pipe(sc->sc_bulkout_pipe);
1158                 sc->sc_bulkout_pipe = NULL;
1159         }
1160         if (sc->sc_ixfer != NULL) {
1161                 usbd_free_xfer(sc->sc_ixfer);
1162                 sc->sc_ixfer = NULL;
1163         }
1164         if (sc->sc_oxfer != NULL) {
1165                 usbd_free_xfer(sc->sc_oxfer);
1166                 sc->sc_oxfer = NULL;
1167         }
1168 }
1169
1170 static void
1171 ucomstopread(struct ucom_softc *sc)
1172 {
1173         usbd_status err;
1174
1175         DPRINTF(("ucomstopread: enter\n"));
1176
1177         if (!(sc->sc_state & UCS_RXSTOP)) {
1178                 sc->sc_state |= UCS_RXSTOP;
1179                 if (sc->sc_bulkin_pipe == NULL) {
1180                         DPRINTF(("ucomstopread: bulkin pipe NULL\n"));
1181                         return;
1182                 }
1183                 err = usbd_abort_pipe(sc->sc_bulkin_pipe);
1184                 if (err) {
1185                         DPRINTF(("ucomstopread: err = %s\n",
1186                                  usbd_errstr(err)));
1187                 }
1188         }
1189
1190         DPRINTF(("ucomstopread: leave\n"));
1191 }
1192
1193 static void
1194 disc_optim(struct tty *tp, struct termios *t, struct ucom_softc *sc)
1195 {
1196         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
1197             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
1198             && (!(t->c_iflag & PARMRK)
1199                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
1200             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
1201             && linesw[tp->t_line].l_rint == ttyinput) {
1202                 DPRINTF(("disc_optim: bypass l_rint\n"));
1203                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
1204         } else {
1205                 DPRINTF(("disc_optim: can't bypass l_rint\n"));
1206                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
1207         }
1208         sc->hotchar = linesw[tp->t_line].l_hotchar;
1209 }