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 1.29 2007/08/07 10:42:40 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                         tp->t_gen++;
 210                         ttyclose(tp);
 211                         ttwakeup(tp);
 212                         ttwwakeup(tp);
 213                 }
 214         } else {
 215                 DPRINTF(("ucom_detach: no tty\n"));
 216                 return (0);
 217         }
 218
 219         crit_enter();
 220         if (--sc->sc_refcnt >= 0) {
 221                 /* Wait for processes to go away. */
 222                 usb_detach_wait(sc->sc_dev);
 223         }
 224         crit_exit();
 225
 226         unit = device_get_unit(sc->sc_dev);
 227         dev_ops_remove(&ucom_ops, UCOMUNIT_MASK, unit);
 228
 229         return (0);
 230 }
 231
 232 static void
 233 ucom_shutdown(struct ucom_softc *sc)
 234 {
 235         struct tty *tp = sc->sc_tty;
 236
 237         DPRINTF(("ucom_shutdown\n"));
 238         /*
 239          * Hang up if necessary.  Wait a bit, so the other side has time to
 240          * notice even if we immediately open the port again.
 241          */
 242         if (ISSET(tp->t_cflag, HUPCL)) {
 243                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 244                 (void)tsleep(sc, 0, "ucomsd", hz);
 245         }
 246 }
 247
 248 static int
 249 ucomopen(struct dev_open_args *ap)
 250 {
 251         cdev_t dev = ap->a_head.a_dev;
 252         int unit = UCOMUNIT(dev);
 253         struct ucom_softc *sc;
 254         usbd_status err;
 255         struct tty *tp;
 256         int error;
 257
 258         sc = devclass_get_softc(ucom_devclass, unit);
 259         if (sc == NULL)
 260                 return (ENXIO);
 261
 262         if (sc->sc_dying)
 263                 return (ENXIO);
 264
 265         tp = sc->sc_tty;
 266
 267         DPRINTF(("%s: ucomopen: tp = %p\n", device_get_nameunit(sc->sc_dev), tp));
 268
 269         if (ISSET(tp->t_state, TS_ISOPEN) &&
 270             ISSET(tp->t_state, TS_XCLUDE) &&
 271             suser_cred(ap->a_cred, 0)
 272         ) {
 273                 return (EBUSY);
 274         }
 275
 276         /*
 277          * Do the following iff this is a first open.
 278          */
 279         crit_enter();
 280         while (sc->sc_opening)
 281                 tsleep(&sc->sc_opening, 0, "ucomop", 0);
 282         sc->sc_opening = 1;
 283
 284         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 285                 struct termios t;
 286
 287                 sc->sc_poll = 0;
 288                 sc->sc_lsr = sc->sc_msr = sc->sc_mcr = 0;
 289
 290                 tp->t_dev = reference_dev(dev);
 291
 292                 /*
 293                  * Initialize the termios status to the defaults.  Add in the
 294                  * sticky bits from TIOCSFLAGS.
 295                  */
 296                 t.c_ispeed = 0;
 297                 t.c_ospeed = TTYDEF_SPEED;
 298                 t.c_cflag = TTYDEF_CFLAG;
 299                 /* Make sure ucomparam() will do something. */
 300                 tp->t_ospeed = 0;
 301                 (void)ucomparam(tp, &t);
 302                 tp->t_iflag = TTYDEF_IFLAG;
 303                 tp->t_oflag = TTYDEF_OFLAG;
 304                 tp->t_lflag = TTYDEF_LFLAG;
 305                 ttychars(tp);
 306                 ttsetwater(tp);
 307
 308                 /*
 309                  * Turn on DTR.  We must always do this, even if carrier is not
 310                  * present, because otherwise we'd have to use TIOCSDTR
 311                  * immediately after setting CLOCAL, which applications do not
 312                  * expect.  We always assert DTR while the device is open
 313                  * unless explicitly requested to deassert it.
 314                  */
 315                 (void)ucomctl(sc, TIOCM_DTR | TIOCM_RTS, DMBIS);
 316
 317                 /* Device specific open */
 318                 if (sc->sc_callback->ucom_open != NULL) {
 319                         error = sc->sc_callback->ucom_open(sc->sc_parent,
 320                                                            sc->sc_portno);
 321                         if (error) {
 322                                 ucom_cleanup(sc);
 323                                 sc->sc_opening = 0;
 324                                 wakeup(&sc->sc_opening);
 325                                 crit_exit();
 326                                 return (error);
 327                         }
 328                 }
 329
 330                 DPRINTF(("ucomopen: open pipes in = %d out = %d\n",
 331                          sc->sc_bulkin_no, sc->sc_bulkout_no));
 332
 333                 /* Open the bulk pipes */
 334                 /* Bulk-in pipe */
 335                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkin_no, 0,
 336                                      &sc->sc_bulkin_pipe);
 337                 if (err) {
 338                         kprintf("%s: open bulk in error (addr %d): %s\n",
 339                                device_get_nameunit(sc->sc_dev), sc->sc_bulkin_no,
 340                                usbd_errstr(err));
 341                         error = EIO;
 342                         goto fail_0;
 343                 }
 344                 /* Bulk-out pipe */
 345                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkout_no,
 346                                      USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
 347                 if (err) {
 348                         kprintf("%s: open bulk out error (addr %d): %s\n",
 349                                device_get_nameunit(sc->sc_dev), sc->sc_bulkout_no,
 350                                usbd_errstr(err));
 351                         error = EIO;
 352                         goto fail_1;
 353                 }
 354
 355                 /* Allocate a request and an input buffer and start reading. */
 356                 sc->sc_ixfer = usbd_alloc_xfer(sc->sc_udev);
 357                 if (sc->sc_ixfer == NULL) {
 358                         error = ENOMEM;
 359                         goto fail_2;
 360                 }
 361
 362                 sc->sc_ibuf = usbd_alloc_buffer(sc->sc_ixfer,
 363                                                 sc->sc_ibufsizepad);
 364                 if (sc->sc_ibuf == NULL) {
 365                         error = ENOMEM;
 366                         goto fail_3;
 367                 }
 368
 369                 sc->sc_oxfer = usbd_alloc_xfer(sc->sc_udev);
 370                 if (sc->sc_oxfer == NULL) {
 371                         error = ENOMEM;
 372                         goto fail_3;
 373                 }
 374
 375                 sc->sc_obuf = usbd_alloc_buffer(sc->sc_oxfer,
 376                                                 sc->sc_obufsize +
 377                                                 sc->sc_opkthdrlen);
 378                 if (sc->sc_obuf == NULL) {
 379                         error = ENOMEM;
 380                         goto fail_4;
 381                 }
 382
 383                 /*
 384                  * Handle initial DCD.
 385                  */
 386                 if (ISSET(sc->sc_msr, UMSR_DCD) ||
 387                     (minor(dev) & UCOM_CALLOUT_MASK))
 388                         (*linesw[tp->t_line].l_modem)(tp, 1);
 389
 390                 ucomstartread(sc);
 391         }
 392
 393         sc->sc_opening = 0;
 394         wakeup(&sc->sc_opening);
 395         crit_exit();
 396
 397         error = ttyopen(dev, tp);
 398         if (error)
 399                 goto bad;
 400
 401         error = (*linesw[tp->t_line].l_open)(dev, tp);
 402         if (error)
 403                 goto bad;
 404
 405         disc_optim(tp, &tp->t_termios, sc);
 406
 407         DPRINTF(("%s: ucomopen: success\n", device_get_nameunit(sc->sc_dev)));
 408
 409         sc->sc_poll = 1;
 410         sc->sc_refcnt++;
 411
 412         return (0);
 413
 414 fail_4:
 415         usbd_free_xfer(sc->sc_oxfer);
 416         sc->sc_oxfer = NULL;
 417 fail_3:
 418         usbd_free_xfer(sc->sc_ixfer);
 419         sc->sc_ixfer = NULL;
 420 fail_2:
 421         usbd_close_pipe(sc->sc_bulkout_pipe);
 422         sc->sc_bulkout_pipe = NULL;
 423 fail_1:
 424         usbd_close_pipe(sc->sc_bulkin_pipe);
 425         sc->sc_bulkin_pipe = NULL;
 426 fail_0:
 427         sc->sc_opening = 0;
 428         wakeup(&sc->sc_opening);
 429         crit_exit();
 430         return (error);
 431
 432 bad:
 433         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 434                 /*
 435                  * We failed to open the device, and nobody else had it opened.
 436                  * Clean up the state as appropriate.
 437                  */
 438                 ucom_cleanup(sc);
 439         }
 440
 441         DPRINTF(("%s: ucomopen: failed\n", device_get_nameunit(sc->sc_dev)));
 442
 443         return (error);
 444 }
 445
 446 static int
 447 ucomclose(struct dev_close_args *ap)
 448 {
 449         cdev_t dev = ap->a_head.a_dev;
 450         struct ucom_softc *sc;
 451         struct tty *tp;
 452
 453         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 454
 455         tp = sc->sc_tty;
 456
 457         DPRINTF(("%s: ucomclose: unit = %d\n",
 458                 device_get_nameunit(sc->sc_dev), UCOMUNIT(dev)));
 459
 460         if (!ISSET(tp->t_state, TS_ISOPEN))
 461                 goto quit;
 462
 463         crit_enter();
 464         (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 465         disc_optim(tp, &tp->t_termios, sc);
 466         ttyclose(tp);
 467         crit_exit();
 468
 469         if (sc->sc_dying)
 470                 goto quit;
 471
 472         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 473                 /*
 474                  * Although we got a last close, the device may still be in
 475                  * use; e.g. if this was the dialout node, and there are still
 476                  * processes waiting for carrier on the non-dialout node.
 477                  */
 478                 ucom_cleanup(sc);
 479         }
 480
 481         if (sc->sc_callback->ucom_close != NULL)
 482                 sc->sc_callback->ucom_close(sc->sc_parent, sc->sc_portno);
 483
 484 quit:
 485         if (tp->t_dev) {
 486                 release_dev(tp->t_dev);
 487                 tp->t_dev = NULL;
 488         }
 489
 490         if (--sc->sc_refcnt < 0)
 491                 usb_detach_wakeup(sc->sc_dev);
 492
 493         return (0);
 494 }
 495
 496 static int
 497 ucomread(struct dev_read_args *ap)
 498 {
 499         cdev_t dev = ap->a_head.a_dev;
 500         struct ucom_softc *sc;
 501         struct tty *tp;
 502         int error;
 503
 504         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 505         tp = sc->sc_tty;
 506
 507         DPRINTF(("ucomread: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 508
 509         if (sc->sc_dying)
 510                 return (EIO);
 511
 512         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 513
 514         DPRINTF(("ucomread: error = %d\n", error));
 515
 516         return (error);
 517 }
 518
 519 static int
 520 ucomwrite(struct dev_write_args *ap)
 521 {
 522         cdev_t dev = ap->a_head.a_dev;
 523         struct ucom_softc *sc;
 524         struct tty *tp;
 525         int error;
 526
 527         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 528         tp = sc->sc_tty;
 529
 530         DPRINTF(("ucomwrite: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 531
 532         if (sc->sc_dying)
 533                 return (EIO);
 534
 535         error = (*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag);
 536
 537         DPRINTF(("ucomwrite: error = %d\n", error));
 538
 539         return (error);
 540 }
 541
 542 static int
 543 ucomioctl(struct dev_ioctl_args *ap)
 544 {
 545         cdev_t dev = ap->a_head.a_dev;
 546         struct ucom_softc *sc;
 547         struct tty *tp;
 548         int error;
 549         int d;
 550
 551         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 552         tp = sc->sc_tty;
 553
 554         if (sc->sc_dying)
 555                 return (EIO);
 556
 557         DPRINTF(("ucomioctl: cmd = 0x%08lx\n", ap->a_cmd));
 558
 559         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 560                                               ap->a_fflag, ap->a_cred);
 561         if (error != ENOIOCTL) {
 562                 DPRINTF(("ucomioctl: l_ioctl: error = %d\n", error));
 563                 return (error);
 564         }
 565
 566         crit_enter();
 567
 568         error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 569         disc_optim(tp, &tp->t_termios, sc);
 570         if (error != ENOIOCTL) {
 571                 crit_exit();
 572                 DPRINTF(("ucomioctl: ttioctl: error = %d\n", error));
 573                 return (error);
 574         }
 575
 576         if (sc->sc_callback->ucom_ioctl != NULL) {
 577                 error = sc->sc_callback->ucom_ioctl(sc->sc_parent,
 578                                                     sc->sc_portno,
 579                                                     ap->a_cmd, ap->a_data,
 580                                                     ap->a_fflag, curthread);
 581                 if (error >= 0) {
 582                         crit_exit();
 583                         return (error);
 584                 }
 585         }
 586
 587         error = 0;
 588
 589         DPRINTF(("ucomioctl: our cmd = 0x%08lx\n", ap->a_cmd));
 590
 591         switch (ap->a_cmd) {
 592         case TIOCSBRK:
 593                 DPRINTF(("ucomioctl: TIOCSBRK\n"));
 594                 ucom_break(sc, 1);
 595                 break;
 596         case TIOCCBRK:
 597                 DPRINTF(("ucomioctl: TIOCCBRK\n"));
 598                 ucom_break(sc, 0);
 599                 break;
 600
 601         case TIOCSDTR:
 602                 DPRINTF(("ucomioctl: TIOCSDTR\n"));
 603                 (void)ucomctl(sc, TIOCM_DTR, DMBIS);
 604                 break;
 605         case TIOCCDTR:
 606                 DPRINTF(("ucomioctl: TIOCCDTR\n"));
 607                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 608                 break;
 609
 610         case TIOCMSET:
 611                 d = *(int *)ap->a_data;
 612                 DPRINTF(("ucomioctl: TIOCMSET, 0x%x\n", d));
 613                 (void)ucomctl(sc, d, DMSET);
 614                 break;
 615         case TIOCMBIS:
 616                 d = *(int *)ap->a_data;
 617                 DPRINTF(("ucomioctl: TIOCMBIS, 0x%x\n", d));
 618                 (void)ucomctl(sc, d, DMBIS);
 619                 break;
 620         case TIOCMBIC:
 621                 d = *(int *)ap->a_data;
 622                 DPRINTF(("ucomioctl: TIOCMBIC, 0x%x\n", d));
 623                 (void)ucomctl(sc, d, DMBIC);
 624                 break;
 625         case TIOCMGET:
 626                 d = ucomctl(sc, 0, DMGET);
 627                 DPRINTF(("ucomioctl: TIOCMGET, 0x%x\n", d));
 628                 *(int *)ap->a_data = d;
 629                 break;
 630
 631         default:
 632                 DPRINTF(("ucomioctl: error: our cmd = 0x%08lx\n", ap->a_cmd));
 633                 error = ENOTTY;
 634                 break;
 635         }
 636
 637         crit_exit();
 638
 639         return (error);
 640 }
 641
 642 static int
 643 ucomctl(struct ucom_softc *sc, int bits, int how)
 644 {
 645         int     mcr;
 646         int     msr;
 647         int     onoff;
 648
 649         DPRINTF(("ucomctl: bits = 0x%x, how = %d\n", bits, how));
 650
 651         if (how == DMGET) {
 652                 SET(bits, TIOCM_LE);            /* always set TIOCM_LE bit */
 653                 DPRINTF(("ucomctl: DMGET: LE"));
 654
 655                 mcr = sc->sc_mcr;
 656                 if (ISSET(mcr, UMCR_DTR)) {
 657                         SET(bits, TIOCM_DTR);
 658                         DPRINTF((" DTR"));
 659                 }
 660                 if (ISSET(mcr, UMCR_RTS)) {
 661                         SET(bits, TIOCM_RTS);
 662                         DPRINTF((" RTS"));
 663                 }
 664
 665                 msr = sc->sc_msr;
 666                 if (ISSET(msr, UMSR_CTS)) {
 667                         SET(bits, TIOCM_CTS);
 668                         DPRINTF((" CTS"));
 669                 }
 670                 if (ISSET(msr, UMSR_DCD)) {
 671                         SET(bits, TIOCM_CD);
 672                         DPRINTF((" CD"));
 673                 }
 674                 if (ISSET(msr, UMSR_DSR)) {
 675                         SET(bits, TIOCM_DSR);
 676                         DPRINTF((" DSR"));
 677                 }
 678                 if (ISSET(msr, UMSR_RI)) {
 679                         SET(bits, TIOCM_RI);
 680                         DPRINTF((" RI"));
 681                 }
 682
 683                 DPRINTF(("\n"));
 684
 685                 return (bits);
 686         }
 687
 688         mcr = 0;
 689         if (ISSET(bits, TIOCM_DTR))
 690                 SET(mcr, UMCR_DTR);
 691         if (ISSET(bits, TIOCM_RTS))
 692                 SET(mcr, UMCR_RTS);
 693
 694         switch (how) {
 695         case DMSET:
 696                 sc->sc_mcr = mcr;
 697                 break;
 698         case DMBIS:
 699                 sc->sc_mcr |= mcr;
 700                 break;
 701         case DMBIC:
 702                 sc->sc_mcr &= ~mcr;
 703                 break;
 704         }
 705
 706         onoff = ISSET(sc->sc_mcr, UMCR_DTR) ? 1 : 0;
 707         ucom_dtr(sc, onoff);
 708
 709         onoff = ISSET(sc->sc_mcr, UMCR_RTS) ? 1 : 0;
 710         ucom_rts(sc, onoff);
 711
 712         return (0);
 713 }
 714
 715 static void
 716 ucom_break(struct ucom_softc *sc, int onoff)
 717 {
 718         DPRINTF(("ucom_break: onoff = %d\n", onoff));
 719
 720         if (sc->sc_callback->ucom_set == NULL)
 721                 return;
 722         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 723                                   UCOM_SET_BREAK, onoff);
 724 }
 725
 726 static void
 727 ucom_dtr(struct ucom_softc *sc, int onoff)
 728 {
 729         DPRINTF(("ucom_dtr: onoff = %d\n", onoff));
 730
 731         if (sc->sc_callback->ucom_set == NULL)
 732                 return;
 733         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 734                                   UCOM_SET_DTR, onoff);
 735 }
 736
 737 static void
 738 ucom_rts(struct ucom_softc *sc, int onoff)
 739 {
 740         DPRINTF(("ucom_rts: onoff = %d\n", onoff));
 741
 742         if (sc->sc_callback->ucom_set == NULL)
 743                 return;
 744         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 745                                   UCOM_SET_RTS, onoff);
 746 }
 747
 748 void
 749 ucom_status_change(struct ucom_softc *sc)
 750 {
 751         struct tty *tp = sc->sc_tty;
 752         u_char old_msr;
 753         int onoff;
 754
 755         if (sc->sc_callback->ucom_get_status == NULL) {
 756                 sc->sc_lsr = 0;
 757                 sc->sc_msr = 0;
 758                 return;
 759         }
 760
 761         old_msr = sc->sc_msr;
 762         sc->sc_callback->ucom_get_status(sc->sc_parent, sc->sc_portno,
 763                                          &sc->sc_lsr, &sc->sc_msr);
 764         if (ISSET((sc->sc_msr ^ old_msr), UMSR_DCD)) {
 765                 if (sc->sc_poll == 0)
 766                         return;
 767                 onoff = ISSET(sc->sc_msr, UMSR_DCD) ? 1 : 0;
 768                 DPRINTF(("ucom_status_change: DCD changed to %d\n", onoff));
 769                 (*linesw[tp->t_line].l_modem)(tp, onoff);
 770         }
 771 }
 772
 773 static int
 774 ucomparam(struct tty *tp, struct termios *t)
 775 {
 776         struct ucom_softc *sc;
 777         int error;
 778         usbd_status uerr;
 779
 780         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 781
 782         if (sc->sc_dying)
 783                 return (EIO);
 784
 785         DPRINTF(("ucomparam: sc = %p\n", sc));
 786
 787         /* Check requested parameters. */
 788         if (t->c_ospeed < 0) {
 789                 DPRINTF(("ucomparam: negative ospeed\n"));
 790                 return (EINVAL);
 791         }
 792         if (t->c_ispeed && t->c_ispeed != t->c_ospeed) {
 793                 DPRINTF(("ucomparam: mismatch ispeed and ospeed\n"));
 794                 return (EINVAL);
 795         }
 796
 797         /*
 798          * If there were no changes, don't do anything.  This avoids dropping
 799          * input and improves performance when all we did was frob things like
 800          * VMIN and VTIME.
 801          */
 802         if (tp->t_ospeed == t->c_ospeed &&
 803             tp->t_cflag == t->c_cflag)
 804                 return (0);
 805
 806         /* And copy to tty. */
 807         tp->t_ispeed = 0;
 808         tp->t_ospeed = t->c_ospeed;
 809         tp->t_cflag = t->c_cflag;
 810
 811         if (sc->sc_callback->ucom_param == NULL)
 812                 return (0);
 813
 814         ucomstopread(sc);
 815
 816         error = sc->sc_callback->ucom_param(sc->sc_parent, sc->sc_portno, t);
 817         if (error) {
 818                 DPRINTF(("ucomparam: callback: error = %d\n", error));
 819                 return (error);
 820         }
 821
 822         ttsetwater(tp);
 823
 824         if (t->c_cflag & CRTS_IFLOW) {
 825                 sc->sc_state |= UCS_RTS_IFLOW;
 826         } else if (sc->sc_state & UCS_RTS_IFLOW) {
 827                 sc->sc_state &= ~UCS_RTS_IFLOW;
 828                 (void)ucomctl(sc, UMCR_RTS, DMBIS);
 829         }
 830
 831         disc_optim(tp, t, sc);
 832
 833         uerr = ucomstartread(sc);
 834         if (uerr != USBD_NORMAL_COMPLETION)
 835                 return (EIO);
 836
 837         return (0);
 838 }
 839
 840 static void
 841 ucomstart(struct tty *tp)
 842 {
 843         struct ucom_softc *sc;
 844         struct cblock *cbp;
 845         usbd_status err;
 846         u_char *data;
 847         int cnt;
 848
 849         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 850         DPRINTF(("ucomstart: sc = %p\n", sc));
 851
 852         if (sc->sc_dying)
 853                 return;
 854
 855         crit_enter();
 856
 857         if (tp->t_state & TS_TBLOCK) {
 858                 if (ISSET(sc->sc_mcr, UMCR_RTS) &&
 859                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 860                         DPRINTF(("ucomstart: clear RTS\n"));
 861                         (void)ucomctl(sc, UMCR_RTS, DMBIC);
 862                 }
 863         } else {
 864                 if (!ISSET(sc->sc_mcr, UMCR_RTS) &&
 865                     tp->t_rawq.c_cc <= tp->t_ilowat &&
 866                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 867                         DPRINTF(("ucomstart: set RTS\n"));
 868                         (void)ucomctl(sc, UMCR_RTS, DMBIS);
 869                 }
 870         }
 871
 872         if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) {
 873                 ttwwakeup(tp);
 874                 DPRINTF(("ucomstart: stopped\n"));
 875                 goto out;
 876         }
 877
 878         if (tp->t_outq.c_cc <= tp->t_olowat) {
 879                 if (ISSET(tp->t_state, TS_SO_OLOWAT)) {
 880                         CLR(tp->t_state, TS_SO_OLOWAT);
 881                         wakeup(TSA_OLOWAT(tp));
 882                 }
 883                 selwakeup(&tp->t_wsel);
 884                 if (tp->t_outq.c_cc == 0) {
 885                         if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
 886                             TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
 887                                 CLR(tp->t_state, TS_SO_OCOMPLETE);
 888                                 wakeup(TSA_OCOMPLETE(tp));
 889                         }
 890                         goto out;
 891                 }
 892         }
 893
 894         /* Grab the first contiguous region of buffer space. */
 895         data = tp->t_outq.c_cf;
 896         cbp = (struct cblock *) ((intptr_t) tp->t_outq.c_cf & ~CROUND);
 897         cnt = min((char *) (cbp+1) - tp->t_outq.c_cf, tp->t_outq.c_cc);
 898
 899         if (cnt == 0) {
 900                 DPRINTF(("ucomstart: cnt == 0\n"));
 901                 goto out;
 902         }
 903
 904         SET(tp->t_state, TS_BUSY);
 905
 906         if (cnt > sc->sc_obufsize) {
 907                 DPRINTF(("ucomstart: big buffer %d chars\n", cnt));
 908                 cnt = sc->sc_obufsize;
 909         }
 910         if (sc->sc_callback->ucom_write != NULL)
 911                 sc->sc_callback->ucom_write(sc->sc_parent, sc->sc_portno,
 912                                             sc->sc_obuf, data, &cnt);
 913         else
 914                 memcpy(sc->sc_obuf, data, cnt);
 915
 916         DPRINTF(("ucomstart: %d chars\n", cnt));
 917         usbd_setup_xfer(sc->sc_oxfer, sc->sc_bulkout_pipe,
 918                         (usbd_private_handle)sc, sc->sc_obuf, cnt,
 919                         USBD_NO_COPY, USBD_NO_TIMEOUT, ucomwritecb);
 920         /* What can we do on error? */
 921         err = usbd_transfer(sc->sc_oxfer);
 922         if (err != USBD_IN_PROGRESS)
 923                 kprintf("ucomstart: err=%s\n", usbd_errstr(err));
 924
 925         ttwwakeup(tp);
 926
 927     out:
 928         crit_exit();
 929 }
 930
 931 static void
 932 ucomstop(struct tty *tp, int flag)
 933 {
 934         struct ucom_softc *sc;
 935
 936         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 937
 938         DPRINTF(("ucomstop: %d\n", flag));
 939
 940         if (flag & FREAD) {
 941                 /*
 942                  * This is just supposed to flush pending receive data,
 943                  * not stop the reception of data entirely!
 944                  */
 945                 DPRINTF(("ucomstop: read\n"));
 946                 ucomstopread(sc);
 947                 ucomstartread(sc);
 948         }
 949
 950         if (flag & FWRITE) {
 951                 DPRINTF(("ucomstop: write\n"));
 952                 crit_enter();
 953                 if (ISSET(tp->t_state, TS_BUSY)) {
 954                         /* XXX do what? */
 955                         if (!ISSET(tp->t_state, TS_TTSTOP))
 956                                 SET(tp->t_state, TS_FLUSH);
 957                 }
 958                 crit_exit();
 959         }
 960
 961         DPRINTF(("ucomstop: done\n"));
 962 }
 963
 964 static void
 965 ucomwritecb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
 966 {
 967         struct ucom_softc *sc = (struct ucom_softc *)p;
 968         struct tty *tp = sc->sc_tty;
 969         u_int32_t cc;
 970
 971         DPRINTF(("ucomwritecb: status = %d\n", status));
 972
 973         if (status == USBD_CANCELLED || sc->sc_dying)
 974                 goto error;
 975
 976         if (status != USBD_NORMAL_COMPLETION) {
 977                 kprintf("%s: ucomwritecb: %s\n",
 978                        device_get_nameunit(sc->sc_dev), usbd_errstr(status));
 979                 if (status == USBD_STALLED)
 980                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
 981                 /*
 982                  * XXX.  We may need a flag to sequence ucomstopread() and
 983                  * ucomstartread() to handle the case where ucomstartread()
 984                  * is called after ucomstopread() but before the request has
 985                  * been properly canceled?
 986                  */
 987                 goto error;
 988         }
 989
 990         usbd_get_xfer_status(xfer, NULL, NULL, &cc, NULL);
 991         DPRINTF(("ucomwritecb: cc = %d\n", cc));
 992         if (cc <= sc->sc_opkthdrlen) {
 993                 kprintf("%s: sent size too small, cc = %d\n",
 994                         device_get_nameunit(sc->sc_dev), cc);
 995                 goto error;
 996         }
 997
 998         /* convert from USB bytes to tty bytes */
 999         cc -= sc->sc_opkthdrlen;
1000
1001         crit_enter();
1002         CLR(tp->t_state, TS_BUSY);
1003         if (ISSET(tp->t_state, TS_FLUSH))
1004                 CLR(tp->t_state, TS_FLUSH);
1005         else
1006                 ndflush(&tp->t_outq, cc);
1007         (*linesw[tp->t_line].l_start)(tp);
1008         crit_exit();
1009
1010         return;
1011
1012   error:
1013         crit_enter();
1014         CLR(tp->t_state, TS_BUSY);
1015         crit_exit();
1016         return;
1017 }
1018
1019 static usbd_status
1020 ucomstartread(struct ucom_softc *sc)
1021 {
1022         usbd_status err;
1023
1024         DPRINTF(("ucomstartread: start\n"));
1025
1026         sc->sc_state &= ~UCS_RXSTOP;
1027
1028         if (sc->sc_bulkin_pipe == NULL)
1029                 return (USBD_NORMAL_COMPLETION);
1030
1031         usbd_setup_xfer(sc->sc_ixfer, sc->sc_bulkin_pipe,
1032                         (usbd_private_handle)sc,
1033                         sc->sc_ibuf, sc->sc_ibufsize,
1034                         USBD_SHORT_XFER_OK | USBD_NO_COPY,
1035                         USBD_NO_TIMEOUT, ucomreadcb);
1036
1037         err = usbd_transfer(sc->sc_ixfer);
1038         if (err != USBD_IN_PROGRESS) {
1039                 DPRINTF(("ucomstartread: err = %s\n", usbd_errstr(err)));
1040                 return (err);
1041         }
1042
1043         return (USBD_NORMAL_COMPLETION);
1044 }
1045
1046 static void
1047 ucomreadcb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1048 {
1049         struct ucom_softc *sc = (struct ucom_softc *)p;
1050         struct tty *tp = sc->sc_tty;
1051         int (*rint) (int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1052         usbd_status err;
1053         u_int32_t cc;
1054         u_char *cp;
1055         int lostcc;
1056
1057         DPRINTF(("ucomreadcb: status = %d\n", status));
1058
1059         if (status != USBD_NORMAL_COMPLETION) {
1060                 if (!(sc->sc_state & UCS_RXSTOP))
1061                         kprintf("%s: ucomreadcb: %s\n",
1062                                device_get_nameunit(sc->sc_dev), usbd_errstr(status));
1063                 if (status == USBD_STALLED)
1064                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1065                 /* XXX we should restart after some delay. */
1066                 return;
1067         }
1068
1069         usbd_get_xfer_status(xfer, NULL, (void **)&cp, &cc, NULL);
1070         DPRINTF(("ucomreadcb: got %d chars, tp = %p\n", cc, tp));
1071         if (cc == 0)
1072                 goto resubmit;
1073
1074         if (sc->sc_callback->ucom_read != NULL) {
1075                 sc->sc_callback->ucom_read(sc->sc_parent, sc->sc_portno,
1076                                            &cp, &cc);
1077         }
1078
1079         if (cc > sc->sc_ibufsize) {
1080                 kprintf("%s: invalid receive data size, %d chars\n",
1081                         device_get_nameunit(sc->sc_dev), cc);
1082                 goto resubmit;
1083         }
1084         if (cc < 1)
1085                 goto resubmit;
1086
1087         crit_enter();
1088         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1089                 if (tp->t_rawq.c_cc + cc > tp->t_ihiwat
1090                     && (sc->sc_state & UCS_RTS_IFLOW
1091                         || tp->t_iflag & IXOFF)
1092                     && !(tp->t_state & TS_TBLOCK))
1093                         ttyblock(tp);
1094                 lostcc = b_to_q((char *)cp, cc, &tp->t_rawq);
1095                 tp->t_rawcc += cc;
1096                 if (sc->hotchar) {
1097                         while (cc) {
1098                                 if (*cp == sc->hotchar)
1099                                         break;
1100                                 --cc;
1101                                 ++cp;
1102                         }
1103                         if (cc)
1104                                 setsofttty();
1105                 }
1106                 ttwakeup(tp);
1107                 if (tp->t_state & TS_TTSTOP
1108                     && (tp->t_iflag & IXANY
1109                         || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1110                         tp->t_state &= ~TS_TTSTOP;
1111                         tp->t_lflag &= ~FLUSHO;
1112                         ucomstart(tp);
1113                 }
1114                 if (lostcc > 0)
1115                         kprintf("%s: lost %d chars\n", device_get_nameunit(sc->sc_dev),
1116                                lostcc);
1117         } else {
1118                 /* Give characters to tty layer. */
1119                 while (cc > 0) {
1120                         DPRINTFN(7, ("ucomreadcb: char = 0x%02x\n", *cp));
1121                         if ((*rint)(*cp, tp) == -1) {
1122                                 /* XXX what should we do? */
1123                                 kprintf("%s: lost %d chars\n",
1124                                        device_get_nameunit(sc->sc_dev), cc);
1125                                 break;
1126                         }
1127                         cc--;
1128                         cp++;
1129                 }
1130         }
1131         crit_exit();
1132
1133 resubmit:
1134         err = ucomstartread(sc);
1135         if (err) {
1136                 kprintf("%s: read start failed\n", device_get_nameunit(sc->sc_dev));
1137                 /* XXX what should we dow now? */
1138         }
1139
1140         if ((sc->sc_state & UCS_RTS_IFLOW) && !ISSET(sc->sc_mcr, UMCR_RTS)
1141             && !(tp->t_state & TS_TBLOCK))
1142                 ucomctl(sc, UMCR_RTS, DMBIS);
1143 }
1144
1145 static void
1146 ucom_cleanup(struct ucom_softc *sc)
1147 {
1148         DPRINTF(("ucom_cleanup: closing pipes\n"));
1149
1150         ucom_shutdown(sc);
1151         if (sc->sc_bulkin_pipe != NULL) {
1152                 usbd_abort_pipe(sc->sc_bulkin_pipe);
1153                 usbd_close_pipe(sc->sc_bulkin_pipe);
1154                 sc->sc_bulkin_pipe = NULL;
1155         }
1156         if (sc->sc_bulkout_pipe != NULL) {
1157                 usbd_abort_pipe(sc->sc_bulkout_pipe);
1158                 usbd_close_pipe(sc->sc_bulkout_pipe);
1159                 sc->sc_bulkout_pipe = NULL;
1160         }
1161         if (sc->sc_ixfer != NULL) {
1162                 usbd_free_xfer(sc->sc_ixfer);
1163                 sc->sc_ixfer = NULL;
1164         }
1165         if (sc->sc_oxfer != NULL) {
1166                 usbd_free_xfer(sc->sc_oxfer);
1167                 sc->sc_oxfer = NULL;
1168         }
1169 }
1170
1171 static void
1172 ucomstopread(struct ucom_softc *sc)
1173 {
1174         usbd_status err;
1175
1176         DPRINTF(("ucomstopread: enter\n"));
1177
1178         if (!(sc->sc_state & UCS_RXSTOP)) {
1179                 sc->sc_state |= UCS_RXSTOP;
1180                 if (sc->sc_bulkin_pipe == NULL) {
1181                         DPRINTF(("ucomstopread: bulkin pipe NULL\n"));
1182                         return;
1183                 }
1184                 err = usbd_abort_pipe(sc->sc_bulkin_pipe);
1185                 if (err) {
1186                         DPRINTF(("ucomstopread: err = %s\n",
1187                                  usbd_errstr(err)));
1188                 }
1189         }
1190
1191         DPRINTF(("ucomstopread: leave\n"));
1192 }
1193
1194 static void
1195 disc_optim(struct tty *tp, struct termios *t, struct ucom_softc *sc)
1196 {
1197         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
1198             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
1199             && (!(t->c_iflag & PARMRK)
1200                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
1201             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
1202             && linesw[tp->t_line].l_rint == ttyinput) {
1203                 DPRINTF(("disc_optim: bypass l_rint\n"));
1204                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
1205         } else {
1206                 DPRINTF(("disc_optim: can't bypass l_rint\n"));
1207                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
1208         }
1209         sc->hotchar = linesw[tp->t_line].l_hotchar;
1210 }