sys/dev/usbmisc/ucom/ucom.c

   1 /*
   2  * (MPSAFE)
   3  *
   4  * $NetBSD: ucom.c,v 1.39 2001/08/16 22:31:24 augustss Exp $
   5  * $NetBSD: ucom.c,v 1.40 2001/11/13 06:24:54 lukem Exp $
   6  * $FreeBSD: src/sys/dev/usb/ucom.c,v 1.35 2003/11/16 11:58:21 akiyama Exp $
   7  * $DragonFly: src/sys/dev/usbmisc/ucom/ucom.c,v 1.32 2007/11/05 19:09:43 hasso Exp $
   8  */
   9 /*-
  10  * Copyright (c) 2001-2002, Shunsuke Akiyama <akiyama@jp.FreeBSD.org>.
  11  * All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
  37  * All rights reserved.
  38  *
  39  * This code is derived from software contributed to The NetBSD Foundation
  40  * by Lennart Augustsson (lennart@augustsson.net) at
  41  * Carlstedt Research & Technology.
  42  *
  43  * Redistribution and use in source and binary forms, with or without
  44  * modification, are permitted provided that the following conditions
  45  * are met:
  46  * 1. Redistributions of source code must retain the above copyright
  47  *    notice, this list of conditions and the following disclaimer.
  48  * 2. Redistributions in binary form must reproduce the above copyright
  49  *    notice, this list of conditions and the following disclaimer in the
  50  *    documentation and/or other materials provided with the distribution.
  51  * 3. All advertising materials mentioning features or use of this software
  52  *    must display the following acknowledgement:
  53  *        This product includes software developed by the NetBSD
  54  *        Foundation, Inc. and its contributors.
  55  * 4. Neither the name of The NetBSD Foundation nor the names of its
  56  *    contributors may be used to endorse or promote products derived
  57  *    from this software without specific prior written permission.
  58  *
  59  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  60  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  61  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  62  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  63  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  64  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  65  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  66  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  67  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  68  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  69  * POSSIBILITY OF SUCH DAMAGE.
  70  */
  71
  72 #include <sys/param.h>
  73 #include <sys/systm.h>
  74 #include <sys/kernel.h>
  75 #include <sys/malloc.h>
  76 #include <sys/bus.h>
  77 #include <sys/fcntl.h>
  78 #include <sys/conf.h>
  79 #include <sys/tty.h>
  80 #include <sys/clist.h>
  81 #include <sys/file.h>
  82 #include <sys/proc.h>
  83 #include <sys/priv.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/usb_quirks.h>
  93
  94 #include "ucomvar.h"
  95
  96 #ifdef USB_DEBUG
  97 static int      ucomdebug = 0;
  98 SYSCTL_NODE(_hw_usb, OID_AUTO, ucom, CTLFLAG_RW, 0, "USB ucom");
  99 SYSCTL_INT(_hw_usb_ucom, OID_AUTO, debug, CTLFLAG_RW,
 100            &ucomdebug, 0, "ucom debug level");
 101 #define DPRINTF(x)      do { \
 102                                 if (ucomdebug) \
 103                                         kprintf x; \
 104                         } while (0)
 105
 106 #define DPRINTFN(n, x)  do { \
 107                                 if (ucomdebug > (n)) \
 108                                         kprintf x; \
 109                         } while (0)
 110 #else
 111 #define DPRINTF(x)
 112 #define DPRINTFN(n, x)
 113 #endif
 114
 115 static d_open_t  ucomopen;
 116 static d_close_t ucomclose;
 117 static d_read_t  ucomread;
 118 static d_write_t ucomwrite;
 119 static d_ioctl_t ucomioctl;
 120
 121 #define UCOM_CDEV_MAJOR  138
 122
 123 static struct dev_ops ucom_ops = {
 124         { "ucom", UCOM_CDEV_MAJOR, D_TTY },
 125         .d_open =       ucomopen,
 126         .d_close =      ucomclose,
 127         .d_read =       ucomread,
 128         .d_write =      ucomwrite,
 129         .d_ioctl =      ucomioctl,
 130         .d_kqfilter =   ttykqfilter,
 131         .d_revoke =     ttyrevoke
 132 };
 133
 134 static void ucom_cleanup(struct ucom_softc *);
 135 static int ucomctl(struct ucom_softc *, int, int);
 136 static int ucomparam(struct tty *, struct termios *);
 137 static void ucomstart(struct tty *);
 138 static void ucomstop(struct tty *, int);
 139 static void ucom_shutdown(struct ucom_softc *);
 140 static void ucom_dtr(struct ucom_softc *, int);
 141 static void ucom_rts(struct ucom_softc *, int);
 142 static void ucom_break(struct ucom_softc *, int);
 143 static usbd_status ucomstartread(struct ucom_softc *);
 144 static void ucomreadcb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 145 static void ucomwritecb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 146 static void ucomstopread(struct ucom_softc *);
 147 static void disc_optim(struct tty *, struct termios *, struct ucom_softc *);
 148
 149 devclass_t ucom_devclass;
 150
 151 static moduledata_t ucom_mod = {
 152         "ucom",
 153         NULL,
 154         NULL
 155 };
 156
 157 DECLARE_MODULE(ucom, ucom_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
 158 MODULE_DEPEND(ucom, usb, 1, 1, 1);
 159 MODULE_VERSION(ucom, UCOM_MODVER);
 160
 161 int
 162 ucom_attach(struct ucom_softc *sc)
 163 {
 164         struct tty *tp;
 165         int unit;
 166         cdev_t dev;
 167
 168         lwkt_gettoken(&tty_token);
 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 = make_dev(&ucom_ops, unit | UCOM_CALLOUT_MASK,
 181                         UID_UUCP, GID_DIALER, 0660,
 182                         "ucom%d", unit);
 183         dev->si_tty = tp;
 184         sc->dev = dev;
 185         lwkt_reltoken(&tty_token);
 186
 187         return (0);
 188 }
 189
 190 int
 191 ucom_detach(struct ucom_softc *sc)
 192 {
 193         struct tty *tp = sc->sc_tty;
 194         int unit;
 195
 196         DPRINTF(("ucom_detach: sc = %p, tp = %p\n", sc, sc->sc_tty));
 197
 198         destroy_dev(sc->dev);
 199         lwkt_gettoken(&tty_token);
 200         sc->sc_dying = 1;
 201
 202         if (sc->sc_bulkin_pipe != NULL)
 203                 usbd_abort_pipe(sc->sc_bulkin_pipe);
 204         if (sc->sc_bulkout_pipe != NULL)
 205                 usbd_abort_pipe(sc->sc_bulkout_pipe);
 206
 207         if (tp != NULL) {
 208                 if (tp->t_state & TS_ISOPEN) {
 209                         device_printf(sc->sc_dev,
 210                                       "still open, forcing close\n");
 211                         (*linesw[tp->t_line].l_close)(tp, 0);
 212                         ttyclose(tp);
 213                 }
 214         } else {
 215                 DPRINTF(("ucom_detach: no tty\n"));
 216                 lwkt_reltoken(&tty_token);
 217                 return (0);
 218         }
 219
 220         crit_enter();
 221         if (--sc->sc_refcnt >= 0) {
 222                 /* Wait for processes to go away. */
 223                 usb_detach_wait(sc->sc_dev);
 224         }
 225         crit_exit();
 226
 227         unit = device_get_unit(sc->sc_dev);
 228         dev_ops_remove_minor(&ucom_ops, /*UCOMUNIT_MASK, */unit);
 229
 230         lwkt_reltoken(&tty_token);
 231         return (0);
 232 }
 233
 234 static void
 235 ucom_shutdown(struct ucom_softc *sc)
 236 {
 237         struct tty *tp = sc->sc_tty;
 238
 239         lwkt_gettoken(&tty_token);
 240         DPRINTF(("ucom_shutdown\n"));
 241         /*
 242          * Hang up if necessary.  Wait a bit, so the other side has time to
 243          * notice even if we immediately open the port again.
 244          */
 245         if (ISSET(tp->t_cflag, HUPCL)) {
 246                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 247                 (void)tsleep(sc, 0, "ucomsd", hz);
 248         }
 249         lwkt_reltoken(&tty_token);
 250 }
 251
 252 static int
 253 ucomopen(struct dev_open_args *ap)
 254 {
 255         cdev_t dev = ap->a_head.a_dev;
 256         int unit = UCOMUNIT(dev);
 257         struct ucom_softc *sc;
 258         usbd_status err;
 259         struct tty *tp;
 260         int error;
 261
 262         sc = devclass_get_softc(ucom_devclass, unit);
 263         if (sc == NULL)
 264                 return (ENXIO);
 265
 266         if (sc->sc_dying)
 267                 return (ENXIO);
 268
 269         lwkt_gettoken(&tty_token);
 270         tp = sc->sc_tty;
 271
 272         DPRINTF(("%s: ucomopen: tp = %p\n", device_get_nameunit(sc->sc_dev), tp));
 273
 274         if (ISSET(tp->t_state, TS_ISOPEN) &&
 275             ISSET(tp->t_state, TS_XCLUDE) &&
 276             priv_check_cred(ap->a_cred, PRIV_ROOT, 0)
 277         ) {
 278                 lwkt_reltoken(&tty_token);
 279                 return (EBUSY);
 280         }
 281
 282         /*
 283          * Do the following iff this is a first open.
 284          */
 285         crit_enter();
 286         while (sc->sc_opening)
 287                 tsleep(&sc->sc_opening, 0, "ucomop", 0);
 288         sc->sc_opening = 1;
 289
 290         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 291                 struct termios t;
 292
 293                 sc->sc_poll = 0;
 294                 sc->sc_lsr = sc->sc_msr = sc->sc_mcr = 0;
 295
 296                 tp->t_dev = reference_dev(dev);
 297
 298                 /*
 299                  * Initialize the termios status to the defaults.  Add in the
 300                  * sticky bits from TIOCSFLAGS.
 301                  */
 302                 t.c_ispeed = 0;
 303                 t.c_ospeed = TTYDEF_SPEED;
 304                 t.c_cflag = TTYDEF_CFLAG;
 305                 /* Make sure ucomparam() will do something. */
 306                 tp->t_ospeed = 0;
 307                 (void)ucomparam(tp, &t);
 308                 tp->t_iflag = TTYDEF_IFLAG;
 309                 tp->t_oflag = TTYDEF_OFLAG;
 310                 tp->t_lflag = TTYDEF_LFLAG;
 311                 ttychars(tp);
 312                 ttsetwater(tp);
 313
 314                 /*
 315                  * Turn on DTR.  We must always do this, even if carrier is not
 316                  * present, because otherwise we'd have to use TIOCSDTR
 317                  * immediately after setting CLOCAL, which applications do not
 318                  * expect.  We always assert DTR while the device is open
 319                  * unless explicitly requested to deassert it.
 320                  */
 321                 (void)ucomctl(sc, TIOCM_DTR | TIOCM_RTS, DMBIS);
 322
 323                 /* Device specific open */
 324                 if (sc->sc_callback->ucom_open != NULL) {
 325                         error = sc->sc_callback->ucom_open(sc->sc_parent,
 326                                                            sc->sc_portno);
 327                         if (error) {
 328                                 ucom_cleanup(sc);
 329                                 sc->sc_opening = 0;
 330                                 wakeup(&sc->sc_opening);
 331                                 crit_exit();
 332                                 lwkt_reltoken(&tty_token);
 333                                 return (error);
 334                         }
 335                 }
 336
 337                 DPRINTF(("ucomopen: open pipes in = %d out = %d\n",
 338                          sc->sc_bulkin_no, sc->sc_bulkout_no));
 339
 340                 /* Open the bulk pipes */
 341                 /* Bulk-in pipe */
 342                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkin_no, 0,
 343                                      &sc->sc_bulkin_pipe);
 344                 if (err) {
 345                         kprintf("%s: open bulk in error (addr %d): %s\n",
 346                                device_get_nameunit(sc->sc_dev), sc->sc_bulkin_no,
 347                                usbd_errstr(err));
 348                         error = EIO;
 349                         goto fail_0;
 350                 }
 351                 /* Bulk-out pipe */
 352                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkout_no,
 353                                      USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
 354                 if (err) {
 355                         kprintf("%s: open bulk out error (addr %d): %s\n",
 356                                device_get_nameunit(sc->sc_dev), sc->sc_bulkout_no,
 357                                usbd_errstr(err));
 358                         error = EIO;
 359                         goto fail_1;
 360                 }
 361
 362                 /* Allocate a request and an input buffer and start reading. */
 363                 sc->sc_ixfer = usbd_alloc_xfer(sc->sc_udev);
 364                 if (sc->sc_ixfer == NULL) {
 365                         error = ENOMEM;
 366                         goto fail_2;
 367                 }
 368
 369                 sc->sc_ibuf = usbd_alloc_buffer(sc->sc_ixfer,
 370                                                 sc->sc_ibufsizepad);
 371                 if (sc->sc_ibuf == NULL) {
 372                         error = ENOMEM;
 373                         goto fail_3;
 374                 }
 375
 376                 sc->sc_oxfer = usbd_alloc_xfer(sc->sc_udev);
 377                 if (sc->sc_oxfer == NULL) {
 378                         error = ENOMEM;
 379                         goto fail_3;
 380                 }
 381
 382                 sc->sc_obuf = usbd_alloc_buffer(sc->sc_oxfer,
 383                                                 sc->sc_obufsize +
 384                                                 sc->sc_opkthdrlen);
 385                 if (sc->sc_obuf == NULL) {
 386                         error = ENOMEM;
 387                         goto fail_4;
 388                 }
 389
 390                 /*
 391                  * Handle initial DCD.
 392                  */
 393                 if (ISSET(sc->sc_msr, UMSR_DCD) ||
 394                     (minor(dev) & UCOM_CALLOUT_MASK))
 395                         (*linesw[tp->t_line].l_modem)(tp, 1);
 396
 397                 ucomstartread(sc);
 398         }
 399
 400         sc->sc_opening = 0;
 401         wakeup(&sc->sc_opening);
 402         crit_exit();
 403
 404         error = ttyopen(dev, tp);
 405         if (error)
 406                 goto bad;
 407
 408         error = (*linesw[tp->t_line].l_open)(dev, tp);
 409         if (error)
 410                 goto bad;
 411
 412         disc_optim(tp, &tp->t_termios, sc);
 413
 414         DPRINTF(("%s: ucomopen: success\n", device_get_nameunit(sc->sc_dev)));
 415
 416         sc->sc_poll = 1;
 417         sc->sc_refcnt++;
 418
 419         lwkt_reltoken(&tty_token);
 420         return (0);
 421
 422 fail_4:
 423         usbd_free_xfer(sc->sc_oxfer);
 424         sc->sc_oxfer = NULL;
 425 fail_3:
 426         usbd_free_xfer(sc->sc_ixfer);
 427         sc->sc_ixfer = NULL;
 428 fail_2:
 429         usbd_close_pipe(sc->sc_bulkout_pipe);
 430         sc->sc_bulkout_pipe = NULL;
 431 fail_1:
 432         usbd_close_pipe(sc->sc_bulkin_pipe);
 433         sc->sc_bulkin_pipe = NULL;
 434 fail_0:
 435         sc->sc_opening = 0;
 436         wakeup(&sc->sc_opening);
 437         crit_exit();
 438         lwkt_reltoken(&tty_token);
 439         return (error);
 440
 441 bad:
 442         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 443                 /*
 444                  * We failed to open the device, and nobody else had it opened.
 445                  * Clean up the state as appropriate.
 446                  */
 447                 ucom_cleanup(sc);
 448         }
 449
 450         DPRINTF(("%s: ucomopen: failed\n", device_get_nameunit(sc->sc_dev)));
 451
 452         lwkt_reltoken(&tty_token);
 453         return (error);
 454 }
 455
 456 static int
 457 ucomclose(struct dev_close_args *ap)
 458 {
 459         cdev_t dev = ap->a_head.a_dev;
 460         struct ucom_softc *sc;
 461         struct tty *tp;
 462
 463         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 464
 465         lwkt_gettoken(&tty_token);
 466         tp = sc->sc_tty;
 467
 468         DPRINTF(("%s: ucomclose: unit = %d\n",
 469                 device_get_nameunit(sc->sc_dev), UCOMUNIT(dev)));
 470
 471         if (!ISSET(tp->t_state, TS_ISOPEN))
 472                 goto quit;
 473
 474         crit_enter();
 475         (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 476         disc_optim(tp, &tp->t_termios, sc);
 477         ttyclose(tp);
 478         crit_exit();
 479
 480         if (sc->sc_dying)
 481                 goto quit;
 482
 483         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 484                 /*
 485                  * Although we got a last close, the device may still be in
 486                  * use; e.g. if this was the dialout node, and there are still
 487                  * processes waiting for carrier on the non-dialout node.
 488                  */
 489                 ucom_cleanup(sc);
 490         }
 491
 492         if (sc->sc_callback->ucom_close != NULL)
 493                 sc->sc_callback->ucom_close(sc->sc_parent, sc->sc_portno);
 494
 495 quit:
 496         if (tp->t_dev) {
 497                 release_dev(tp->t_dev);
 498                 tp->t_dev = NULL;
 499         }
 500
 501         if (--sc->sc_refcnt < 0)
 502                 usb_detach_wakeup(sc->sc_dev);
 503
 504         lwkt_reltoken(&tty_token);
 505         return (0);
 506 }
 507
 508 static int
 509 ucomread(struct dev_read_args *ap)
 510 {
 511         cdev_t dev = ap->a_head.a_dev;
 512         struct ucom_softc *sc;
 513         struct tty *tp;
 514         int error;
 515
 516         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 517         lwkt_gettoken(&tty_token);
 518         tp = sc->sc_tty;
 519
 520         DPRINTF(("ucomread: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 521
 522         if (sc->sc_dying) {
 523                 lwkt_reltoken(&tty_token);
 524                 return (EIO);
 525         }
 526
 527         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 528
 529         DPRINTF(("ucomread: error = %d\n", error));
 530
 531         lwkt_reltoken(&tty_token);
 532         return (error);
 533 }
 534
 535 static int
 536 ucomwrite(struct dev_write_args *ap)
 537 {
 538         cdev_t dev = ap->a_head.a_dev;
 539         struct ucom_softc *sc;
 540         struct tty *tp;
 541         int error;
 542
 543         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 544         lwkt_gettoken(&tty_token);
 545         tp = sc->sc_tty;
 546
 547         DPRINTF(("ucomwrite: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 548
 549         if (sc->sc_dying) {
 550                 lwkt_reltoken(&tty_token);
 551                 return (EIO);
 552         }
 553
 554         error = (*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag);
 555
 556         DPRINTF(("ucomwrite: error = %d\n", error));
 557
 558         lwkt_reltoken(&tty_token);
 559         return (error);
 560 }
 561
 562 static int
 563 ucomioctl(struct dev_ioctl_args *ap)
 564 {
 565         cdev_t dev = ap->a_head.a_dev;
 566         struct ucom_softc *sc;
 567         struct tty *tp;
 568         int error;
 569         int d;
 570
 571         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 572         lwkt_gettoken(&tty_token);
 573         tp = sc->sc_tty;
 574
 575         if (sc->sc_dying) {
 576                 lwkt_reltoken(&tty_token);
 577                 return (EIO);
 578         }
 579
 580         DPRINTF(("ucomioctl: cmd = 0x%08lx\n", ap->a_cmd));
 581
 582         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 583                                               ap->a_fflag, ap->a_cred);
 584         if (error != ENOIOCTL) {
 585                 DPRINTF(("ucomioctl: l_ioctl: error = %d\n", error));
 586                 lwkt_reltoken(&tty_token);
 587                 return (error);
 588         }
 589
 590         crit_enter();
 591
 592         error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 593         disc_optim(tp, &tp->t_termios, sc);
 594         if (error != ENOIOCTL) {
 595                 crit_exit();
 596                 DPRINTF(("ucomioctl: ttioctl: error = %d\n", error));
 597                 lwkt_reltoken(&tty_token);
 598                 return (error);
 599         }
 600
 601         if (sc->sc_callback->ucom_ioctl != NULL) {
 602                 error = sc->sc_callback->ucom_ioctl(sc->sc_parent,
 603                                                     sc->sc_portno,
 604                                                     ap->a_cmd, ap->a_data,
 605                                                     ap->a_fflag, curthread);
 606                 if (error >= 0) {
 607                         crit_exit();
 608                         lwkt_reltoken(&tty_token);
 609                         return (error);
 610                 }
 611         }
 612
 613         error = 0;
 614
 615         DPRINTF(("ucomioctl: our cmd = 0x%08lx\n", ap->a_cmd));
 616
 617         switch (ap->a_cmd) {
 618         case TIOCSBRK:
 619                 DPRINTF(("ucomioctl: TIOCSBRK\n"));
 620                 ucom_break(sc, 1);
 621                 break;
 622         case TIOCCBRK:
 623                 DPRINTF(("ucomioctl: TIOCCBRK\n"));
 624                 ucom_break(sc, 0);
 625                 break;
 626
 627         case TIOCSDTR:
 628                 DPRINTF(("ucomioctl: TIOCSDTR\n"));
 629                 (void)ucomctl(sc, TIOCM_DTR, DMBIS);
 630                 break;
 631         case TIOCCDTR:
 632                 DPRINTF(("ucomioctl: TIOCCDTR\n"));
 633                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 634                 break;
 635
 636         case TIOCMSET:
 637                 d = *(int *)ap->a_data;
 638                 DPRINTF(("ucomioctl: TIOCMSET, 0x%x\n", d));
 639                 (void)ucomctl(sc, d, DMSET);
 640                 break;
 641         case TIOCMBIS:
 642                 d = *(int *)ap->a_data;
 643                 DPRINTF(("ucomioctl: TIOCMBIS, 0x%x\n", d));
 644                 (void)ucomctl(sc, d, DMBIS);
 645                 break;
 646         case TIOCMBIC:
 647                 d = *(int *)ap->a_data;
 648                 DPRINTF(("ucomioctl: TIOCMBIC, 0x%x\n", d));
 649                 (void)ucomctl(sc, d, DMBIC);
 650                 break;
 651         case TIOCMGET:
 652                 d = ucomctl(sc, 0, DMGET);
 653                 DPRINTF(("ucomioctl: TIOCMGET, 0x%x\n", d));
 654                 *(int *)ap->a_data = d;
 655                 break;
 656
 657         default:
 658                 DPRINTF(("ucomioctl: error: our cmd = 0x%08lx\n", ap->a_cmd));
 659                 error = ENOTTY;
 660                 break;
 661         }
 662
 663         crit_exit();
 664
 665         lwkt_reltoken(&tty_token);
 666         return (error);
 667 }
 668
 669 /*
 670  * NOTE: Must be called with tty_token held.
 671  */
 672 static int
 673 ucomctl(struct ucom_softc *sc, int bits, int how)
 674 {
 675         int     mcr;
 676         int     msr;
 677         int     onoff;
 678
 679         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 680         DPRINTF(("ucomctl: bits = 0x%x, how = %d\n", bits, how));
 681
 682         if (how == DMGET) {
 683                 SET(bits, TIOCM_LE);            /* always set TIOCM_LE bit */
 684                 DPRINTF(("ucomctl: DMGET: LE"));
 685
 686                 mcr = sc->sc_mcr;
 687                 if (ISSET(mcr, UMCR_DTR)) {
 688                         SET(bits, TIOCM_DTR);
 689                         DPRINTF((" DTR"));
 690                 }
 691                 if (ISSET(mcr, UMCR_RTS)) {
 692                         SET(bits, TIOCM_RTS);
 693                         DPRINTF((" RTS"));
 694                 }
 695
 696                 msr = sc->sc_msr;
 697                 if (ISSET(msr, UMSR_CTS)) {
 698                         SET(bits, TIOCM_CTS);
 699                         DPRINTF((" CTS"));
 700                 }
 701                 if (ISSET(msr, UMSR_DCD)) {
 702                         SET(bits, TIOCM_CD);
 703                         DPRINTF((" CD"));
 704                 }
 705                 if (ISSET(msr, UMSR_DSR)) {
 706                         SET(bits, TIOCM_DSR);
 707                         DPRINTF((" DSR"));
 708                 }
 709                 if (ISSET(msr, UMSR_RI)) {
 710                         SET(bits, TIOCM_RI);
 711                         DPRINTF((" RI"));
 712                 }
 713
 714                 DPRINTF(("\n"));
 715
 716                 return (bits);
 717         }
 718
 719         mcr = 0;
 720         if (ISSET(bits, TIOCM_DTR))
 721                 SET(mcr, UMCR_DTR);
 722         if (ISSET(bits, TIOCM_RTS))
 723                 SET(mcr, UMCR_RTS);
 724
 725         switch (how) {
 726         case DMSET:
 727                 sc->sc_mcr = mcr;
 728                 break;
 729         case DMBIS:
 730                 sc->sc_mcr |= mcr;
 731                 break;
 732         case DMBIC:
 733                 sc->sc_mcr &= ~mcr;
 734                 break;
 735         }
 736
 737         onoff = ISSET(sc->sc_mcr, UMCR_DTR) ? 1 : 0;
 738         ucom_dtr(sc, onoff);
 739
 740         onoff = ISSET(sc->sc_mcr, UMCR_RTS) ? 1 : 0;
 741         ucom_rts(sc, onoff);
 742
 743         return (0);
 744 }
 745
 746 /*
 747  * NOTE: Must be called with tty_token held.
 748  */
 749 static void
 750 ucom_break(struct ucom_softc *sc, int onoff)
 751 {
 752         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 753         DPRINTF(("ucom_break: onoff = %d\n", onoff));
 754
 755         if (sc->sc_callback->ucom_set == NULL)
 756                 return;
 757         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 758                                   UCOM_SET_BREAK, onoff);
 759 }
 760
 761 /*
 762  * NOTE: Must be called with tty_token held.
 763  */
 764 static void
 765 ucom_dtr(struct ucom_softc *sc, int onoff)
 766 {
 767         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 768         DPRINTF(("ucom_dtr: onoff = %d\n", onoff));
 769
 770         if (sc->sc_callback->ucom_set == NULL)
 771                 return;
 772         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 773                                   UCOM_SET_DTR, onoff);
 774 }
 775
 776 /*
 777  * NOTE: Must be called with tty_token held.
 778  */
 779 static void
 780 ucom_rts(struct ucom_softc *sc, int onoff)
 781 {
 782         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 783         DPRINTF(("ucom_rts: onoff = %d\n", onoff));
 784
 785         if (sc->sc_callback->ucom_set == NULL)
 786                 return;
 787         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 788                                   UCOM_SET_RTS, onoff);
 789 }
 790
 791 void
 792 ucom_status_change(struct ucom_softc *sc)
 793 {
 794         struct tty *tp = sc->sc_tty;
 795         u_char old_msr;
 796         int onoff;
 797
 798         lwkt_gettoken(&tty_token);
 799         if (sc->sc_callback->ucom_get_status == NULL) {
 800                 sc->sc_lsr = 0;
 801                 sc->sc_msr = 0;
 802                 lwkt_reltoken(&tty_token);
 803                 return;
 804         }
 805
 806         old_msr = sc->sc_msr;
 807         sc->sc_callback->ucom_get_status(sc->sc_parent, sc->sc_portno,
 808                                          &sc->sc_lsr, &sc->sc_msr);
 809         if (ISSET((sc->sc_msr ^ old_msr), UMSR_DCD)) {
 810                 if (sc->sc_poll == 0) {
 811                         lwkt_reltoken(&tty_token);
 812                         return;
 813                 }
 814                 onoff = ISSET(sc->sc_msr, UMSR_DCD) ? 1 : 0;
 815                 DPRINTF(("ucom_status_change: DCD changed to %d\n", onoff));
 816                 (*linesw[tp->t_line].l_modem)(tp, onoff);
 817         }
 818         lwkt_reltoken(&tty_token);
 819 }
 820
 821 static int
 822 ucomparam(struct tty *tp, struct termios *t)
 823 {
 824         struct ucom_softc *sc;
 825         int error;
 826         usbd_status uerr;
 827
 828         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 829
 830         lwkt_gettoken(&tty_token);
 831         if (sc->sc_dying) {
 832                 lwkt_reltoken(&tty_token);
 833                 return (EIO);
 834         }
 835
 836         DPRINTF(("ucomparam: sc = %p\n", sc));
 837
 838         /* Check requested parameters. */
 839         if (t->c_ospeed < 0) {
 840                 DPRINTF(("ucomparam: negative ospeed\n"));
 841                 lwkt_reltoken(&tty_token);
 842                 return (EINVAL);
 843         }
 844         if (t->c_ispeed && t->c_ispeed != t->c_ospeed) {
 845                 DPRINTF(("ucomparam: mismatch ispeed and ospeed\n"));
 846                 lwkt_reltoken(&tty_token);
 847                 return (EINVAL);
 848         }
 849
 850         /*
 851          * If there were no changes, don't do anything.  This avoids dropping
 852          * input and improves performance when all we did was frob things like
 853          * VMIN and VTIME.
 854          */
 855         if (tp->t_ospeed == t->c_ospeed &&
 856             tp->t_cflag == t->c_cflag) {
 857                 lwkt_reltoken(&tty_token);
 858                 return (0);
 859         }
 860
 861         /* And copy to tty. */
 862         tp->t_ispeed = 0;
 863         tp->t_ospeed = t->c_ospeed;
 864         tp->t_cflag = t->c_cflag;
 865
 866         if (sc->sc_callback->ucom_param == NULL) {
 867                 lwkt_reltoken(&tty_token);
 868                 return (0);
 869         }
 870
 871         ucomstopread(sc);
 872
 873         error = sc->sc_callback->ucom_param(sc->sc_parent, sc->sc_portno, t);
 874         if (error) {
 875                 DPRINTF(("ucomparam: callback: error = %d\n", error));
 876                 lwkt_reltoken(&tty_token);
 877                 return (error);
 878         }
 879
 880         ttsetwater(tp);
 881
 882         if (t->c_cflag & CRTS_IFLOW) {
 883                 sc->sc_state |= UCS_RTS_IFLOW;
 884         } else if (sc->sc_state & UCS_RTS_IFLOW) {
 885                 sc->sc_state &= ~UCS_RTS_IFLOW;
 886                 (void)ucomctl(sc, UMCR_RTS, DMBIS);
 887         }
 888
 889         disc_optim(tp, t, sc);
 890
 891         uerr = ucomstartread(sc);
 892         if (uerr != USBD_NORMAL_COMPLETION) {
 893                 lwkt_reltoken(&tty_token);
 894                 return (EIO);
 895         }
 896
 897         lwkt_reltoken(&tty_token);
 898         return (0);
 899 }
 900
 901 static void
 902 ucomstart(struct tty *tp)
 903 {
 904         struct ucom_softc *sc;
 905         struct cblock *cbp;
 906         usbd_status err;
 907         u_char *data;
 908         int cnt;
 909
 910         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 911         DPRINTF(("ucomstart: sc = %p\n", sc));
 912
 913         lwkt_gettoken(&tty_token);
 914
 915         if (sc->sc_dying) {
 916                 lwkt_reltoken(&tty_token);
 917                 return;
 918         }
 919
 920         crit_enter();
 921
 922         if (tp->t_state & TS_TBLOCK) {
 923                 if (ISSET(sc->sc_mcr, UMCR_RTS) &&
 924                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 925                         DPRINTF(("ucomstart: clear RTS\n"));
 926                         (void)ucomctl(sc, UMCR_RTS, DMBIC);
 927                 }
 928         } else {
 929                 if (!ISSET(sc->sc_mcr, UMCR_RTS) &&
 930                     tp->t_rawq.c_cc <= tp->t_ilowat &&
 931                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 932                         DPRINTF(("ucomstart: set RTS\n"));
 933                         (void)ucomctl(sc, UMCR_RTS, DMBIS);
 934                 }
 935         }
 936
 937         if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) {
 938                 ttwwakeup(tp);
 939                 DPRINTF(("ucomstart: stopped\n"));
 940                 goto out;
 941         }
 942
 943         if (tp->t_outq.c_cc <= tp->t_olowat) {
 944                 if (ISSET(tp->t_state, TS_SO_OLOWAT)) {
 945                         CLR(tp->t_state, TS_SO_OLOWAT);
 946                         wakeup(TSA_OLOWAT(tp));
 947                 }
 948                 KNOTE(&tp->t_wkq.ki_note, 0);
 949                 if (tp->t_outq.c_cc == 0) {
 950                         if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
 951                             TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
 952                                 CLR(tp->t_state, TS_SO_OCOMPLETE);
 953                                 wakeup(TSA_OCOMPLETE(tp));
 954                         }
 955                         goto out;
 956                 }
 957         }
 958
 959         /* Grab the first contiguous region of buffer space. */
 960         data = tp->t_outq.c_cf;
 961         cbp = (struct cblock *) ((intptr_t) tp->t_outq.c_cf & ~CROUND);
 962         cnt = min((char *) (cbp+1) - tp->t_outq.c_cf, tp->t_outq.c_cc);
 963
 964         if (cnt == 0) {
 965                 DPRINTF(("ucomstart: cnt == 0\n"));
 966                 goto out;
 967         }
 968
 969         SET(tp->t_state, TS_BUSY);
 970
 971         if (cnt > sc->sc_obufsize) {
 972                 DPRINTF(("ucomstart: big buffer %d chars\n", cnt));
 973                 cnt = sc->sc_obufsize;
 974         }
 975         if (sc->sc_callback->ucom_write != NULL)
 976                 sc->sc_callback->ucom_write(sc->sc_parent, sc->sc_portno,
 977                                             sc->sc_obuf, data, &cnt);
 978         else
 979                 memcpy(sc->sc_obuf, data, cnt);
 980
 981         DPRINTF(("ucomstart: %d chars\n", cnt));
 982         usbd_setup_xfer(sc->sc_oxfer, sc->sc_bulkout_pipe,
 983                         (usbd_private_handle)sc, sc->sc_obuf, cnt,
 984                         USBD_NO_COPY, USBD_NO_TIMEOUT, ucomwritecb);
 985         /* What can we do on error? */
 986         err = usbd_transfer(sc->sc_oxfer);
 987         if (err != USBD_IN_PROGRESS)
 988                 kprintf("ucomstart: err=%s\n", usbd_errstr(err));
 989
 990         ttwwakeup(tp);
 991
 992     out:
 993         crit_exit();
 994         lwkt_reltoken(&tty_token);
 995 }
 996
 997 static void
 998 ucomstop(struct tty *tp, int flag)
 999 {
1000         struct ucom_softc *sc;
1001
1002         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
1003
1004         DPRINTF(("ucomstop: %d\n", flag));
1005
1006         lwkt_gettoken(&tty_token);
1007         if (flag & FREAD) {
1008                 /*
1009                  * This is just supposed to flush pending receive data,
1010                  * not stop the reception of data entirely!
1011                  */
1012                 DPRINTF(("ucomstop: read\n"));
1013                 ucomstopread(sc);
1014                 ucomstartread(sc);
1015         }
1016
1017         if (flag & FWRITE) {
1018                 DPRINTF(("ucomstop: write\n"));
1019                 crit_enter();
1020                 if (ISSET(tp->t_state, TS_BUSY)) {
1021                         /* XXX do what? */
1022                         if (!ISSET(tp->t_state, TS_TTSTOP))
1023                                 SET(tp->t_state, TS_FLUSH);
1024                 }
1025                 crit_exit();
1026         }
1027
1028         DPRINTF(("ucomstop: done\n"));
1029         lwkt_reltoken(&tty_token);
1030 }
1031
1032 static void
1033 ucomwritecb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1034 {
1035         struct ucom_softc *sc = (struct ucom_softc *)p;
1036         struct tty *tp = sc->sc_tty;
1037         u_int32_t cc;
1038
1039         lwkt_gettoken(&tty_token);
1040         DPRINTF(("ucomwritecb: status = %d\n", status));
1041
1042         if (status == USBD_CANCELLED || sc->sc_dying)
1043                 goto error;
1044
1045         if (status != USBD_NORMAL_COMPLETION) {
1046                 kprintf("%s: ucomwritecb: %s\n",
1047                        device_get_nameunit(sc->sc_dev), usbd_errstr(status));
1048                 if (status == USBD_STALLED)
1049                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1050                 /*
1051                  * XXX.  We may need a flag to sequence ucomstopread() and
1052                  * ucomstartread() to handle the case where ucomstartread()
1053                  * is called after ucomstopread() but before the request has
1054                  * been properly canceled?
1055                  */
1056                 goto error;
1057         }
1058
1059         usbd_get_xfer_status(xfer, NULL, NULL, &cc, NULL);
1060         DPRINTF(("ucomwritecb: cc = %d\n", cc));
1061         if (cc <= sc->sc_opkthdrlen) {
1062                 kprintf("%s: sent size too small, cc = %d\n",
1063                         device_get_nameunit(sc->sc_dev), cc);
1064                 goto error;
1065         }
1066
1067         /* convert from USB bytes to tty bytes */
1068         cc -= sc->sc_opkthdrlen;
1069
1070         crit_enter();
1071         CLR(tp->t_state, TS_BUSY);
1072         if (ISSET(tp->t_state, TS_FLUSH))
1073                 CLR(tp->t_state, TS_FLUSH);
1074         else
1075                 ndflush(&tp->t_outq, cc);
1076         (*linesw[tp->t_line].l_start)(tp);
1077         crit_exit();
1078
1079         lwkt_reltoken(&tty_token);
1080         return;
1081
1082   error:
1083         crit_enter();
1084         CLR(tp->t_state, TS_BUSY);
1085         crit_exit();
1086         lwkt_reltoken(&tty_token);
1087         return;
1088 }
1089
1090 /*
1091  * NOTE: Must be called with tty_token held
1092  */
1093 static usbd_status
1094 ucomstartread(struct ucom_softc *sc)
1095 {
1096         usbd_status err;
1097
1098         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1099         DPRINTF(("ucomstartread: start\n"));
1100
1101         sc->sc_state &= ~UCS_RXSTOP;
1102
1103         if (sc->sc_bulkin_pipe == NULL)
1104                 return (USBD_NORMAL_COMPLETION);
1105
1106         usbd_setup_xfer(sc->sc_ixfer, sc->sc_bulkin_pipe,
1107                         (usbd_private_handle)sc,
1108                         sc->sc_ibuf, sc->sc_ibufsize,
1109                         USBD_SHORT_XFER_OK | USBD_NO_COPY,
1110                         USBD_NO_TIMEOUT, ucomreadcb);
1111
1112         err = usbd_transfer(sc->sc_ixfer);
1113         if (err != USBD_IN_PROGRESS) {
1114                 DPRINTF(("ucomstartread: err = %s\n", usbd_errstr(err)));
1115                 return (err);
1116         }
1117
1118         return (USBD_NORMAL_COMPLETION);
1119 }
1120
1121 static void
1122 ucomreadcb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1123 {
1124         lwkt_gettoken(&tty_token);
1125
1126         struct ucom_softc *sc = (struct ucom_softc *)p;
1127         struct tty *tp = sc->sc_tty;
1128         int (*rint) (int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1129         usbd_status err;
1130         u_int32_t cc;
1131         u_char *cp;
1132         int lostcc;
1133
1134         DPRINTF(("ucomreadcb: status = %d\n", status));
1135
1136         if (status != USBD_NORMAL_COMPLETION) {
1137                 if (!(sc->sc_state & UCS_RXSTOP))
1138                         kprintf("%s: ucomreadcb: %s\n",
1139                                device_get_nameunit(sc->sc_dev), usbd_errstr(status));
1140                 if (status == USBD_STALLED)
1141                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1142                 /* XXX we should restart after some delay. */
1143                 lwkt_reltoken(&tty_token);
1144                 return;
1145         }
1146
1147         usbd_get_xfer_status(xfer, NULL, (void **)&cp, &cc, NULL);
1148         DPRINTF(("ucomreadcb: got %d chars, tp = %p\n", cc, tp));
1149         if (cc == 0)
1150                 goto resubmit;
1151
1152         if (sc->sc_callback->ucom_read != NULL) {
1153                 sc->sc_callback->ucom_read(sc->sc_parent, sc->sc_portno,
1154                                            &cp, &cc);
1155         }
1156
1157         if (cc > sc->sc_ibufsize) {
1158                 kprintf("%s: invalid receive data size, %d chars\n",
1159                         device_get_nameunit(sc->sc_dev), cc);
1160                 goto resubmit;
1161         }
1162         if (cc < 1)
1163                 goto resubmit;
1164
1165         crit_enter();
1166         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1167                 if (tp->t_rawq.c_cc + cc > tp->t_ihiwat
1168                     && (sc->sc_state & UCS_RTS_IFLOW
1169                         || tp->t_iflag & IXOFF)
1170                     && !(tp->t_state & TS_TBLOCK))
1171                         ttyblock(tp);
1172                 lostcc = b_to_q((char *)cp, cc, &tp->t_rawq);
1173                 tp->t_rawcc += cc;
1174                 if (sc->hotchar) {
1175                         while (cc) {
1176                                 if (*cp == sc->hotchar)
1177                                         break;
1178                                 --cc;
1179                                 ++cp;
1180                         }
1181                         if (cc)
1182                                 setsofttty();
1183                 }
1184                 ttwakeup(tp);
1185                 if (tp->t_state & TS_TTSTOP
1186                     && (tp->t_iflag & IXANY
1187                         || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1188                         tp->t_state &= ~TS_TTSTOP;
1189                         tp->t_lflag &= ~FLUSHO;
1190                         ucomstart(tp);
1191                 }
1192                 if (lostcc > 0)
1193                         kprintf("%s: lost %d chars\n", device_get_nameunit(sc->sc_dev),
1194                                lostcc);
1195         } else {
1196                 /* Give characters to tty layer. */
1197                 while (cc > 0) {
1198                         DPRINTFN(7, ("ucomreadcb: char = 0x%02x\n", *cp));
1199                         if ((*rint)(*cp, tp) == -1) {
1200                                 /* XXX what should we do? */
1201                                 kprintf("%s: lost %d chars\n",
1202                                        device_get_nameunit(sc->sc_dev), cc);
1203                                 break;
1204                         }
1205                         cc--;
1206                         cp++;
1207                 }
1208         }
1209         crit_exit();
1210
1211 resubmit:
1212         err = ucomstartread(sc);
1213         if (err) {
1214                 kprintf("%s: read start failed\n", device_get_nameunit(sc->sc_dev));
1215                 /* XXX what should we dow now? */
1216         }
1217
1218         if ((sc->sc_state & UCS_RTS_IFLOW) && !ISSET(sc->sc_mcr, UMCR_RTS)
1219             && !(tp->t_state & TS_TBLOCK))
1220                 ucomctl(sc, UMCR_RTS, DMBIS);
1221
1222         lwkt_reltoken(&tty_token);
1223 }
1224
1225 /*
1226  * NOTE: Must be called with tty_token held.
1227  */
1228 static void
1229 ucom_cleanup(struct ucom_softc *sc)
1230 {
1231         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1232         DPRINTF(("ucom_cleanup: closing pipes\n"));
1233
1234         ucom_shutdown(sc);
1235         if (sc->sc_bulkin_pipe != NULL) {
1236                 usbd_abort_pipe(sc->sc_bulkin_pipe);
1237                 usbd_close_pipe(sc->sc_bulkin_pipe);
1238                 sc->sc_bulkin_pipe = NULL;
1239         }
1240         if (sc->sc_bulkout_pipe != NULL) {
1241                 usbd_abort_pipe(sc->sc_bulkout_pipe);
1242                 usbd_close_pipe(sc->sc_bulkout_pipe);
1243                 sc->sc_bulkout_pipe = NULL;
1244         }
1245         if (sc->sc_ixfer != NULL) {
1246                 usbd_free_xfer(sc->sc_ixfer);
1247                 sc->sc_ixfer = NULL;
1248         }
1249         if (sc->sc_oxfer != NULL) {
1250                 usbd_free_xfer(sc->sc_oxfer);
1251                 sc->sc_oxfer = NULL;
1252         }
1253 }
1254
1255 /*
1256  * NOTE: Must be called with tty_token held.
1257  */
1258 static void
1259 ucomstopread(struct ucom_softc *sc)
1260 {
1261         usbd_status err;
1262
1263         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1264         DPRINTF(("ucomstopread: enter\n"));
1265
1266         if (!(sc->sc_state & UCS_RXSTOP)) {
1267                 sc->sc_state |= UCS_RXSTOP;
1268                 if (sc->sc_bulkin_pipe == NULL) {
1269                         DPRINTF(("ucomstopread: bulkin pipe NULL\n"));
1270                         return;
1271                 }
1272                 err = usbd_abort_pipe(sc->sc_bulkin_pipe);
1273                 if (err) {
1274                         DPRINTF(("ucomstopread: err = %s\n",
1275                                  usbd_errstr(err)));
1276                 }
1277         }
1278
1279         DPRINTF(("ucomstopread: leave\n"));
1280 }
1281
1282 /*
1283  * NOTE: Must be called with tty_token held.
1284  */
1285 static void
1286 disc_optim(struct tty *tp, struct termios *t, struct ucom_softc *sc)
1287 {
1288         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1289         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
1290             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
1291             && (!(t->c_iflag & PARMRK)
1292                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
1293             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
1294             && linesw[tp->t_line].l_rint == ttyinput) {
1295                 DPRINTF(("disc_optim: bypass l_rint\n"));
1296                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
1297         } else {
1298                 DPRINTF(("disc_optim: can't bypass l_rint\n"));
1299                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
1300         }
1301         sc->hotchar = linesw[tp->t_line].l_hotchar;
1302 }