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         lwkt_reltoken(&tty_token);
 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         lwkt_gettoken(&tty_token);
 198         sc->sc_dying = 1;
 199
 200         if (sc->sc_bulkin_pipe != NULL)
 201                 usbd_abort_pipe(sc->sc_bulkin_pipe);
 202         if (sc->sc_bulkout_pipe != NULL)
 203                 usbd_abort_pipe(sc->sc_bulkout_pipe);
 204
 205         if (tp != NULL) {
 206                 if (tp->t_state & TS_ISOPEN) {
 207                         device_printf(sc->sc_dev,
 208                                       "still open, forcing close\n");
 209                         (*linesw[tp->t_line].l_close)(tp, 0);
 210                         ttyclose(tp);
 211                 }
 212         } else {
 213                 DPRINTF(("ucom_detach: no tty\n"));
 214                 lwkt_reltoken(&tty_token);
 215                 return (0);
 216         }
 217
 218         crit_enter();
 219         if (--sc->sc_refcnt >= 0) {
 220                 /* Wait for processes to go away. */
 221                 usb_detach_wait(sc->sc_dev);
 222         }
 223         crit_exit();
 224
 225         unit = device_get_unit(sc->sc_dev);
 226         dev_ops_remove_minor(&ucom_ops, /*UCOMUNIT_MASK, */unit);
 227
 228         lwkt_reltoken(&tty_token);
 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         lwkt_gettoken(&tty_token);
 238         DPRINTF(("ucom_shutdown\n"));
 239         /*
 240          * Hang up if necessary.  Wait a bit, so the other side has time to
 241          * notice even if we immediately open the port again.
 242          */
 243         if (ISSET(tp->t_cflag, HUPCL)) {
 244                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 245                 (void)tsleep(sc, 0, "ucomsd", hz);
 246         }
 247         lwkt_reltoken(&tty_token);
 248 }
 249
 250 static int
 251 ucomopen(struct dev_open_args *ap)
 252 {
 253         cdev_t dev = ap->a_head.a_dev;
 254         int unit = UCOMUNIT(dev);
 255         struct ucom_softc *sc;
 256         usbd_status err;
 257         struct tty *tp;
 258         int error;
 259
 260         sc = devclass_get_softc(ucom_devclass, unit);
 261         if (sc == NULL)
 262                 return (ENXIO);
 263
 264         if (sc->sc_dying)
 265                 return (ENXIO);
 266
 267         lwkt_gettoken(&tty_token);
 268         tp = sc->sc_tty;
 269
 270         DPRINTF(("%s: ucomopen: tp = %p\n", device_get_nameunit(sc->sc_dev), tp));
 271
 272         if (ISSET(tp->t_state, TS_ISOPEN) &&
 273             ISSET(tp->t_state, TS_XCLUDE) &&
 274             priv_check_cred(ap->a_cred, PRIV_ROOT, 0)
 275         ) {
 276                 lwkt_reltoken(&tty_token);
 277                 return (EBUSY);
 278         }
 279
 280         /*
 281          * Do the following iff this is a first open.
 282          */
 283         crit_enter();
 284         while (sc->sc_opening)
 285                 tsleep(&sc->sc_opening, 0, "ucomop", 0);
 286         sc->sc_opening = 1;
 287
 288         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 289                 struct termios t;
 290
 291                 sc->sc_poll = 0;
 292                 sc->sc_lsr = sc->sc_msr = sc->sc_mcr = 0;
 293
 294                 tp->t_dev = reference_dev(dev);
 295
 296                 /*
 297                  * Initialize the termios status to the defaults.  Add in the
 298                  * sticky bits from TIOCSFLAGS.
 299                  */
 300                 t.c_ispeed = 0;
 301                 t.c_ospeed = TTYDEF_SPEED;
 302                 t.c_cflag = TTYDEF_CFLAG;
 303                 /* Make sure ucomparam() will do something. */
 304                 tp->t_ospeed = 0;
 305                 (void)ucomparam(tp, &t);
 306                 tp->t_iflag = TTYDEF_IFLAG;
 307                 tp->t_oflag = TTYDEF_OFLAG;
 308                 tp->t_lflag = TTYDEF_LFLAG;
 309                 ttychars(tp);
 310                 ttsetwater(tp);
 311
 312                 /*
 313                  * Turn on DTR.  We must always do this, even if carrier is not
 314                  * present, because otherwise we'd have to use TIOCSDTR
 315                  * immediately after setting CLOCAL, which applications do not
 316                  * expect.  We always assert DTR while the device is open
 317                  * unless explicitly requested to deassert it.
 318                  */
 319                 (void)ucomctl(sc, TIOCM_DTR | TIOCM_RTS, DMBIS);
 320
 321                 /* Device specific open */
 322                 if (sc->sc_callback->ucom_open != NULL) {
 323                         error = sc->sc_callback->ucom_open(sc->sc_parent,
 324                                                            sc->sc_portno);
 325                         if (error) {
 326                                 ucom_cleanup(sc);
 327                                 sc->sc_opening = 0;
 328                                 wakeup(&sc->sc_opening);
 329                                 crit_exit();
 330                                 lwkt_reltoken(&tty_token);
 331                                 return (error);
 332                         }
 333                 }
 334
 335                 DPRINTF(("ucomopen: open pipes in = %d out = %d\n",
 336                          sc->sc_bulkin_no, sc->sc_bulkout_no));
 337
 338                 /* Open the bulk pipes */
 339                 /* Bulk-in pipe */
 340                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkin_no, 0,
 341                                      &sc->sc_bulkin_pipe);
 342                 if (err) {
 343                         kprintf("%s: open bulk in error (addr %d): %s\n",
 344                                device_get_nameunit(sc->sc_dev), sc->sc_bulkin_no,
 345                                usbd_errstr(err));
 346                         error = EIO;
 347                         goto fail_0;
 348                 }
 349                 /* Bulk-out pipe */
 350                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkout_no,
 351                                      USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
 352                 if (err) {
 353                         kprintf("%s: open bulk out error (addr %d): %s\n",
 354                                device_get_nameunit(sc->sc_dev), sc->sc_bulkout_no,
 355                                usbd_errstr(err));
 356                         error = EIO;
 357                         goto fail_1;
 358                 }
 359
 360                 /* Allocate a request and an input buffer and start reading. */
 361                 sc->sc_ixfer = usbd_alloc_xfer(sc->sc_udev);
 362                 if (sc->sc_ixfer == NULL) {
 363                         error = ENOMEM;
 364                         goto fail_2;
 365                 }
 366
 367                 sc->sc_ibuf = usbd_alloc_buffer(sc->sc_ixfer,
 368                                                 sc->sc_ibufsizepad);
 369                 if (sc->sc_ibuf == NULL) {
 370                         error = ENOMEM;
 371                         goto fail_3;
 372                 }
 373
 374                 sc->sc_oxfer = usbd_alloc_xfer(sc->sc_udev);
 375                 if (sc->sc_oxfer == NULL) {
 376                         error = ENOMEM;
 377                         goto fail_3;
 378                 }
 379
 380                 sc->sc_obuf = usbd_alloc_buffer(sc->sc_oxfer,
 381                                                 sc->sc_obufsize +
 382                                                 sc->sc_opkthdrlen);
 383                 if (sc->sc_obuf == NULL) {
 384                         error = ENOMEM;
 385                         goto fail_4;
 386                 }
 387
 388                 /*
 389                  * Handle initial DCD.
 390                  */
 391                 if (ISSET(sc->sc_msr, UMSR_DCD) ||
 392                     (minor(dev) & UCOM_CALLOUT_MASK))
 393                         (*linesw[tp->t_line].l_modem)(tp, 1);
 394
 395                 ucomstartread(sc);
 396         }
 397
 398         sc->sc_opening = 0;
 399         wakeup(&sc->sc_opening);
 400         crit_exit();
 401
 402         error = ttyopen(dev, tp);
 403         if (error)
 404                 goto bad;
 405
 406         error = (*linesw[tp->t_line].l_open)(dev, tp);
 407         if (error)
 408                 goto bad;
 409
 410         disc_optim(tp, &tp->t_termios, sc);
 411
 412         DPRINTF(("%s: ucomopen: success\n", device_get_nameunit(sc->sc_dev)));
 413
 414         sc->sc_poll = 1;
 415         sc->sc_refcnt++;
 416
 417         lwkt_reltoken(&tty_token);
 418         return (0);
 419
 420 fail_4:
 421         usbd_free_xfer(sc->sc_oxfer);
 422         sc->sc_oxfer = NULL;
 423 fail_3:
 424         usbd_free_xfer(sc->sc_ixfer);
 425         sc->sc_ixfer = NULL;
 426 fail_2:
 427         usbd_close_pipe(sc->sc_bulkout_pipe);
 428         sc->sc_bulkout_pipe = NULL;
 429 fail_1:
 430         usbd_close_pipe(sc->sc_bulkin_pipe);
 431         sc->sc_bulkin_pipe = NULL;
 432 fail_0:
 433         sc->sc_opening = 0;
 434         wakeup(&sc->sc_opening);
 435         crit_exit();
 436         lwkt_reltoken(&tty_token);
 437         return (error);
 438
 439 bad:
 440         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 441                 /*
 442                  * We failed to open the device, and nobody else had it opened.
 443                  * Clean up the state as appropriate.
 444                  */
 445                 ucom_cleanup(sc);
 446         }
 447
 448         DPRINTF(("%s: ucomopen: failed\n", device_get_nameunit(sc->sc_dev)));
 449
 450         lwkt_reltoken(&tty_token);
 451         return (error);
 452 }
 453
 454 static int
 455 ucomclose(struct dev_close_args *ap)
 456 {
 457         cdev_t dev = ap->a_head.a_dev;
 458         struct ucom_softc *sc;
 459         struct tty *tp;
 460
 461         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 462
 463         lwkt_gettoken(&tty_token);
 464         tp = sc->sc_tty;
 465
 466         DPRINTF(("%s: ucomclose: unit = %d\n",
 467                 device_get_nameunit(sc->sc_dev), UCOMUNIT(dev)));
 468
 469         if (!ISSET(tp->t_state, TS_ISOPEN))
 470                 goto quit;
 471
 472         crit_enter();
 473         (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 474         disc_optim(tp, &tp->t_termios, sc);
 475         ttyclose(tp);
 476         crit_exit();
 477
 478         if (sc->sc_dying)
 479                 goto quit;
 480
 481         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 482                 /*
 483                  * Although we got a last close, the device may still be in
 484                  * use; e.g. if this was the dialout node, and there are still
 485                  * processes waiting for carrier on the non-dialout node.
 486                  */
 487                 ucom_cleanup(sc);
 488         }
 489
 490         if (sc->sc_callback->ucom_close != NULL)
 491                 sc->sc_callback->ucom_close(sc->sc_parent, sc->sc_portno);
 492
 493 quit:
 494         if (tp->t_dev) {
 495                 release_dev(tp->t_dev);
 496                 tp->t_dev = NULL;
 497         }
 498
 499         if (--sc->sc_refcnt < 0)
 500                 usb_detach_wakeup(sc->sc_dev);
 501
 502         lwkt_reltoken(&tty_token);
 503         return (0);
 504 }
 505
 506 static int
 507 ucomread(struct dev_read_args *ap)
 508 {
 509         cdev_t dev = ap->a_head.a_dev;
 510         struct ucom_softc *sc;
 511         struct tty *tp;
 512         int error;
 513
 514         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 515         lwkt_gettoken(&tty_token);
 516         tp = sc->sc_tty;
 517
 518         DPRINTF(("ucomread: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 519
 520         if (sc->sc_dying) {
 521                 lwkt_reltoken(&tty_token);
 522                 return (EIO);
 523         }
 524
 525         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 526
 527         DPRINTF(("ucomread: error = %d\n", error));
 528
 529         lwkt_reltoken(&tty_token);
 530         return (error);
 531 }
 532
 533 static int
 534 ucomwrite(struct dev_write_args *ap)
 535 {
 536         cdev_t dev = ap->a_head.a_dev;
 537         struct ucom_softc *sc;
 538         struct tty *tp;
 539         int error;
 540
 541         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 542         lwkt_gettoken(&tty_token);
 543         tp = sc->sc_tty;
 544
 545         DPRINTF(("ucomwrite: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 546
 547         if (sc->sc_dying) {
 548                 lwkt_reltoken(&tty_token);
 549                 return (EIO);
 550         }
 551
 552         error = (*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag);
 553
 554         DPRINTF(("ucomwrite: error = %d\n", error));
 555
 556         lwkt_reltoken(&tty_token);
 557         return (error);
 558 }
 559
 560 static int
 561 ucomioctl(struct dev_ioctl_args *ap)
 562 {
 563         cdev_t dev = ap->a_head.a_dev;
 564         struct ucom_softc *sc;
 565         struct tty *tp;
 566         int error;
 567         int d;
 568
 569         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 570         lwkt_gettoken(&tty_token);
 571         tp = sc->sc_tty;
 572
 573         if (sc->sc_dying) {
 574                 lwkt_reltoken(&tty_token);
 575                 return (EIO);
 576         }
 577
 578         DPRINTF(("ucomioctl: cmd = 0x%08lx\n", ap->a_cmd));
 579
 580         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 581                                               ap->a_fflag, ap->a_cred);
 582         if (error != ENOIOCTL) {
 583                 DPRINTF(("ucomioctl: l_ioctl: error = %d\n", error));
 584                 lwkt_reltoken(&tty_token);
 585                 return (error);
 586         }
 587
 588         crit_enter();
 589
 590         error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 591         disc_optim(tp, &tp->t_termios, sc);
 592         if (error != ENOIOCTL) {
 593                 crit_exit();
 594                 DPRINTF(("ucomioctl: ttioctl: error = %d\n", error));
 595                 lwkt_reltoken(&tty_token);
 596                 return (error);
 597         }
 598
 599         if (sc->sc_callback->ucom_ioctl != NULL) {
 600                 error = sc->sc_callback->ucom_ioctl(sc->sc_parent,
 601                                                     sc->sc_portno,
 602                                                     ap->a_cmd, ap->a_data,
 603                                                     ap->a_fflag, curthread);
 604                 if (error >= 0) {
 605                         crit_exit();
 606                         lwkt_reltoken(&tty_token);
 607                         return (error);
 608                 }
 609         }
 610
 611         error = 0;
 612
 613         DPRINTF(("ucomioctl: our cmd = 0x%08lx\n", ap->a_cmd));
 614
 615         switch (ap->a_cmd) {
 616         case TIOCSBRK:
 617                 DPRINTF(("ucomioctl: TIOCSBRK\n"));
 618                 ucom_break(sc, 1);
 619                 break;
 620         case TIOCCBRK:
 621                 DPRINTF(("ucomioctl: TIOCCBRK\n"));
 622                 ucom_break(sc, 0);
 623                 break;
 624
 625         case TIOCSDTR:
 626                 DPRINTF(("ucomioctl: TIOCSDTR\n"));
 627                 (void)ucomctl(sc, TIOCM_DTR, DMBIS);
 628                 break;
 629         case TIOCCDTR:
 630                 DPRINTF(("ucomioctl: TIOCCDTR\n"));
 631                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 632                 break;
 633
 634         case TIOCMSET:
 635                 d = *(int *)ap->a_data;
 636                 DPRINTF(("ucomioctl: TIOCMSET, 0x%x\n", d));
 637                 (void)ucomctl(sc, d, DMSET);
 638                 break;
 639         case TIOCMBIS:
 640                 d = *(int *)ap->a_data;
 641                 DPRINTF(("ucomioctl: TIOCMBIS, 0x%x\n", d));
 642                 (void)ucomctl(sc, d, DMBIS);
 643                 break;
 644         case TIOCMBIC:
 645                 d = *(int *)ap->a_data;
 646                 DPRINTF(("ucomioctl: TIOCMBIC, 0x%x\n", d));
 647                 (void)ucomctl(sc, d, DMBIC);
 648                 break;
 649         case TIOCMGET:
 650                 d = ucomctl(sc, 0, DMGET);
 651                 DPRINTF(("ucomioctl: TIOCMGET, 0x%x\n", d));
 652                 *(int *)ap->a_data = d;
 653                 break;
 654
 655         default:
 656                 DPRINTF(("ucomioctl: error: our cmd = 0x%08lx\n", ap->a_cmd));
 657                 error = ENOTTY;
 658                 break;
 659         }
 660
 661         crit_exit();
 662
 663         lwkt_reltoken(&tty_token);
 664         return (error);
 665 }
 666
 667 /*
 668  * NOTE: Must be called with tty_token held.
 669  */
 670 static int
 671 ucomctl(struct ucom_softc *sc, int bits, int how)
 672 {
 673         int     mcr;
 674         int     msr;
 675         int     onoff;
 676
 677         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 678         DPRINTF(("ucomctl: bits = 0x%x, how = %d\n", bits, how));
 679
 680         if (how == DMGET) {
 681                 SET(bits, TIOCM_LE);            /* always set TIOCM_LE bit */
 682                 DPRINTF(("ucomctl: DMGET: LE"));
 683
 684                 mcr = sc->sc_mcr;
 685                 if (ISSET(mcr, UMCR_DTR)) {
 686                         SET(bits, TIOCM_DTR);
 687                         DPRINTF((" DTR"));
 688                 }
 689                 if (ISSET(mcr, UMCR_RTS)) {
 690                         SET(bits, TIOCM_RTS);
 691                         DPRINTF((" RTS"));
 692                 }
 693
 694                 msr = sc->sc_msr;
 695                 if (ISSET(msr, UMSR_CTS)) {
 696                         SET(bits, TIOCM_CTS);
 697                         DPRINTF((" CTS"));
 698                 }
 699                 if (ISSET(msr, UMSR_DCD)) {
 700                         SET(bits, TIOCM_CD);
 701                         DPRINTF((" CD"));
 702                 }
 703                 if (ISSET(msr, UMSR_DSR)) {
 704                         SET(bits, TIOCM_DSR);
 705                         DPRINTF((" DSR"));
 706                 }
 707                 if (ISSET(msr, UMSR_RI)) {
 708                         SET(bits, TIOCM_RI);
 709                         DPRINTF((" RI"));
 710                 }
 711
 712                 DPRINTF(("\n"));
 713
 714                 return (bits);
 715         }
 716
 717         mcr = 0;
 718         if (ISSET(bits, TIOCM_DTR))
 719                 SET(mcr, UMCR_DTR);
 720         if (ISSET(bits, TIOCM_RTS))
 721                 SET(mcr, UMCR_RTS);
 722
 723         switch (how) {
 724         case DMSET:
 725                 sc->sc_mcr = mcr;
 726                 break;
 727         case DMBIS:
 728                 sc->sc_mcr |= mcr;
 729                 break;
 730         case DMBIC:
 731                 sc->sc_mcr &= ~mcr;
 732                 break;
 733         }
 734
 735         onoff = ISSET(sc->sc_mcr, UMCR_DTR) ? 1 : 0;
 736         ucom_dtr(sc, onoff);
 737
 738         onoff = ISSET(sc->sc_mcr, UMCR_RTS) ? 1 : 0;
 739         ucom_rts(sc, onoff);
 740
 741         return (0);
 742 }
 743
 744 /*
 745  * NOTE: Must be called with tty_token held.
 746  */
 747 static void
 748 ucom_break(struct ucom_softc *sc, int onoff)
 749 {
 750         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 751         DPRINTF(("ucom_break: onoff = %d\n", onoff));
 752
 753         if (sc->sc_callback->ucom_set == NULL)
 754                 return;
 755         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 756                                   UCOM_SET_BREAK, onoff);
 757 }
 758
 759 /*
 760  * NOTE: Must be called with tty_token held.
 761  */
 762 static void
 763 ucom_dtr(struct ucom_softc *sc, int onoff)
 764 {
 765         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 766         DPRINTF(("ucom_dtr: onoff = %d\n", onoff));
 767
 768         if (sc->sc_callback->ucom_set == NULL)
 769                 return;
 770         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 771                                   UCOM_SET_DTR, onoff);
 772 }
 773
 774 /*
 775  * NOTE: Must be called with tty_token held.
 776  */
 777 static void
 778 ucom_rts(struct ucom_softc *sc, int onoff)
 779 {
 780         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 781         DPRINTF(("ucom_rts: onoff = %d\n", onoff));
 782
 783         if (sc->sc_callback->ucom_set == NULL)
 784                 return;
 785         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 786                                   UCOM_SET_RTS, onoff);
 787 }
 788
 789 void
 790 ucom_status_change(struct ucom_softc *sc)
 791 {
 792         struct tty *tp = sc->sc_tty;
 793         u_char old_msr;
 794         int onoff;
 795
 796         lwkt_gettoken(&tty_token);
 797         if (sc->sc_callback->ucom_get_status == NULL) {
 798                 sc->sc_lsr = 0;
 799                 sc->sc_msr = 0;
 800                 lwkt_reltoken(&tty_token);
 801                 return;
 802         }
 803
 804         old_msr = sc->sc_msr;
 805         sc->sc_callback->ucom_get_status(sc->sc_parent, sc->sc_portno,
 806                                          &sc->sc_lsr, &sc->sc_msr);
 807         if (ISSET((sc->sc_msr ^ old_msr), UMSR_DCD)) {
 808                 if (sc->sc_poll == 0) {
 809                         lwkt_reltoken(&tty_token);
 810                         return;
 811                 }
 812                 onoff = ISSET(sc->sc_msr, UMSR_DCD) ? 1 : 0;
 813                 DPRINTF(("ucom_status_change: DCD changed to %d\n", onoff));
 814                 (*linesw[tp->t_line].l_modem)(tp, onoff);
 815         }
 816         lwkt_reltoken(&tty_token);
 817 }
 818
 819 static int
 820 ucomparam(struct tty *tp, struct termios *t)
 821 {
 822         struct ucom_softc *sc;
 823         int error;
 824         usbd_status uerr;
 825
 826         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 827
 828         lwkt_gettoken(&tty_token);
 829         if (sc->sc_dying) {
 830                 lwkt_reltoken(&tty_token);
 831                 return (EIO);
 832         }
 833
 834         DPRINTF(("ucomparam: sc = %p\n", sc));
 835
 836         /* Check requested parameters. */
 837         if (t->c_ospeed < 0) {
 838                 DPRINTF(("ucomparam: negative ospeed\n"));
 839                 lwkt_reltoken(&tty_token);
 840                 return (EINVAL);
 841         }
 842         if (t->c_ispeed && t->c_ispeed != t->c_ospeed) {
 843                 DPRINTF(("ucomparam: mismatch ispeed and ospeed\n"));
 844                 lwkt_reltoken(&tty_token);
 845                 return (EINVAL);
 846         }
 847
 848         /*
 849          * If there were no changes, don't do anything.  This avoids dropping
 850          * input and improves performance when all we did was frob things like
 851          * VMIN and VTIME.
 852          */
 853         if (tp->t_ospeed == t->c_ospeed &&
 854             tp->t_cflag == t->c_cflag) {
 855                 lwkt_reltoken(&tty_token);
 856                 return (0);
 857         }
 858
 859         /* And copy to tty. */
 860         tp->t_ispeed = 0;
 861         tp->t_ospeed = t->c_ospeed;
 862         tp->t_cflag = t->c_cflag;
 863
 864         if (sc->sc_callback->ucom_param == NULL) {
 865                 lwkt_reltoken(&tty_token);
 866                 return (0);
 867         }
 868
 869         ucomstopread(sc);
 870
 871         error = sc->sc_callback->ucom_param(sc->sc_parent, sc->sc_portno, t);
 872         if (error) {
 873                 DPRINTF(("ucomparam: callback: error = %d\n", error));
 874                 lwkt_reltoken(&tty_token);
 875                 return (error);
 876         }
 877
 878         ttsetwater(tp);
 879
 880         if (t->c_cflag & CRTS_IFLOW) {
 881                 sc->sc_state |= UCS_RTS_IFLOW;
 882         } else if (sc->sc_state & UCS_RTS_IFLOW) {
 883                 sc->sc_state &= ~UCS_RTS_IFLOW;
 884                 (void)ucomctl(sc, UMCR_RTS, DMBIS);
 885         }
 886
 887         disc_optim(tp, t, sc);
 888
 889         uerr = ucomstartread(sc);
 890         if (uerr != USBD_NORMAL_COMPLETION) {
 891                 lwkt_reltoken(&tty_token);
 892                 return (EIO);
 893         }
 894
 895         lwkt_reltoken(&tty_token);
 896         return (0);
 897 }
 898
 899 static void
 900 ucomstart(struct tty *tp)
 901 {
 902         struct ucom_softc *sc;
 903         struct cblock *cbp;
 904         usbd_status err;
 905         u_char *data;
 906         int cnt;
 907
 908         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 909         DPRINTF(("ucomstart: sc = %p\n", sc));
 910
 911         lwkt_gettoken(&tty_token);
 912
 913         if (sc->sc_dying) {
 914                 lwkt_reltoken(&tty_token);
 915                 return;
 916         }
 917
 918         crit_enter();
 919
 920         if (tp->t_state & TS_TBLOCK) {
 921                 if (ISSET(sc->sc_mcr, UMCR_RTS) &&
 922                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 923                         DPRINTF(("ucomstart: clear RTS\n"));
 924                         (void)ucomctl(sc, UMCR_RTS, DMBIC);
 925                 }
 926         } else {
 927                 if (!ISSET(sc->sc_mcr, UMCR_RTS) &&
 928                     tp->t_rawq.c_cc <= tp->t_ilowat &&
 929                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 930                         DPRINTF(("ucomstart: set RTS\n"));
 931                         (void)ucomctl(sc, UMCR_RTS, DMBIS);
 932                 }
 933         }
 934
 935         if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) {
 936                 ttwwakeup(tp);
 937                 DPRINTF(("ucomstart: stopped\n"));
 938                 goto out;
 939         }
 940
 941         if (tp->t_outq.c_cc <= tp->t_olowat) {
 942                 if (ISSET(tp->t_state, TS_SO_OLOWAT)) {
 943                         CLR(tp->t_state, TS_SO_OLOWAT);
 944                         wakeup(TSA_OLOWAT(tp));
 945                 }
 946                 KNOTE(&tp->t_wkq.ki_note, 0);
 947                 if (tp->t_outq.c_cc == 0) {
 948                         if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
 949                             TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
 950                                 CLR(tp->t_state, TS_SO_OCOMPLETE);
 951                                 wakeup(TSA_OCOMPLETE(tp));
 952                         }
 953                         goto out;
 954                 }
 955         }
 956
 957         /* Grab the first contiguous region of buffer space. */
 958         data = tp->t_outq.c_cf;
 959         cbp = (struct cblock *) ((intptr_t) tp->t_outq.c_cf & ~CROUND);
 960         cnt = min((char *) (cbp+1) - tp->t_outq.c_cf, tp->t_outq.c_cc);
 961
 962         if (cnt == 0) {
 963                 DPRINTF(("ucomstart: cnt == 0\n"));
 964                 goto out;
 965         }
 966
 967         SET(tp->t_state, TS_BUSY);
 968
 969         if (cnt > sc->sc_obufsize) {
 970                 DPRINTF(("ucomstart: big buffer %d chars\n", cnt));
 971                 cnt = sc->sc_obufsize;
 972         }
 973         if (sc->sc_callback->ucom_write != NULL)
 974                 sc->sc_callback->ucom_write(sc->sc_parent, sc->sc_portno,
 975                                             sc->sc_obuf, data, &cnt);
 976         else
 977                 memcpy(sc->sc_obuf, data, cnt);
 978
 979         DPRINTF(("ucomstart: %d chars\n", cnt));
 980         usbd_setup_xfer(sc->sc_oxfer, sc->sc_bulkout_pipe,
 981                         (usbd_private_handle)sc, sc->sc_obuf, cnt,
 982                         USBD_NO_COPY, USBD_NO_TIMEOUT, ucomwritecb);
 983         /* What can we do on error? */
 984         err = usbd_transfer(sc->sc_oxfer);
 985         if (err != USBD_IN_PROGRESS)
 986                 kprintf("ucomstart: err=%s\n", usbd_errstr(err));
 987
 988         ttwwakeup(tp);
 989
 990     out:
 991         crit_exit();
 992         lwkt_reltoken(&tty_token);
 993 }
 994
 995 static void
 996 ucomstop(struct tty *tp, int flag)
 997 {
 998         struct ucom_softc *sc;
 999
1000         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
1001
1002         DPRINTF(("ucomstop: %d\n", flag));
1003
1004         lwkt_gettoken(&tty_token);
1005         if (flag & FREAD) {
1006                 /*
1007                  * This is just supposed to flush pending receive data,
1008                  * not stop the reception of data entirely!
1009                  */
1010                 DPRINTF(("ucomstop: read\n"));
1011                 ucomstopread(sc);
1012                 ucomstartread(sc);
1013         }
1014
1015         if (flag & FWRITE) {
1016                 DPRINTF(("ucomstop: write\n"));
1017                 crit_enter();
1018                 if (ISSET(tp->t_state, TS_BUSY)) {
1019                         /* XXX do what? */
1020                         if (!ISSET(tp->t_state, TS_TTSTOP))
1021                                 SET(tp->t_state, TS_FLUSH);
1022                 }
1023                 crit_exit();
1024         }
1025
1026         DPRINTF(("ucomstop: done\n"));
1027         lwkt_reltoken(&tty_token);
1028 }
1029
1030 static void
1031 ucomwritecb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1032 {
1033         struct ucom_softc *sc = (struct ucom_softc *)p;
1034         struct tty *tp = sc->sc_tty;
1035         u_int32_t cc;
1036
1037         lwkt_gettoken(&tty_token);
1038         DPRINTF(("ucomwritecb: status = %d\n", status));
1039
1040         if (status == USBD_CANCELLED || sc->sc_dying)
1041                 goto error;
1042
1043         if (status != USBD_NORMAL_COMPLETION) {
1044                 kprintf("%s: ucomwritecb: %s\n",
1045                        device_get_nameunit(sc->sc_dev), usbd_errstr(status));
1046                 if (status == USBD_STALLED)
1047                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1048                 /*
1049                  * XXX.  We may need a flag to sequence ucomstopread() and
1050                  * ucomstartread() to handle the case where ucomstartread()
1051                  * is called after ucomstopread() but before the request has
1052                  * been properly canceled?
1053                  */
1054                 goto error;
1055         }
1056
1057         usbd_get_xfer_status(xfer, NULL, NULL, &cc, NULL);
1058         DPRINTF(("ucomwritecb: cc = %d\n", cc));
1059         if (cc <= sc->sc_opkthdrlen) {
1060                 kprintf("%s: sent size too small, cc = %d\n",
1061                         device_get_nameunit(sc->sc_dev), cc);
1062                 goto error;
1063         }
1064
1065         /* convert from USB bytes to tty bytes */
1066         cc -= sc->sc_opkthdrlen;
1067
1068         crit_enter();
1069         CLR(tp->t_state, TS_BUSY);
1070         if (ISSET(tp->t_state, TS_FLUSH))
1071                 CLR(tp->t_state, TS_FLUSH);
1072         else
1073                 ndflush(&tp->t_outq, cc);
1074         (*linesw[tp->t_line].l_start)(tp);
1075         crit_exit();
1076
1077         lwkt_reltoken(&tty_token);
1078         return;
1079
1080   error:
1081         crit_enter();
1082         CLR(tp->t_state, TS_BUSY);
1083         crit_exit();
1084         lwkt_reltoken(&tty_token);
1085         return;
1086 }
1087
1088 /*
1089  * NOTE: Must be called with tty_token held
1090  */
1091 static usbd_status
1092 ucomstartread(struct ucom_softc *sc)
1093 {
1094         usbd_status err;
1095
1096         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1097         DPRINTF(("ucomstartread: start\n"));
1098
1099         sc->sc_state &= ~UCS_RXSTOP;
1100
1101         if (sc->sc_bulkin_pipe == NULL)
1102                 return (USBD_NORMAL_COMPLETION);
1103
1104         usbd_setup_xfer(sc->sc_ixfer, sc->sc_bulkin_pipe,
1105                         (usbd_private_handle)sc,
1106                         sc->sc_ibuf, sc->sc_ibufsize,
1107                         USBD_SHORT_XFER_OK | USBD_NO_COPY,
1108                         USBD_NO_TIMEOUT, ucomreadcb);
1109
1110         err = usbd_transfer(sc->sc_ixfer);
1111         if (err != USBD_IN_PROGRESS) {
1112                 DPRINTF(("ucomstartread: err = %s\n", usbd_errstr(err)));
1113                 return (err);
1114         }
1115
1116         return (USBD_NORMAL_COMPLETION);
1117 }
1118
1119 static void
1120 ucomreadcb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1121 {
1122         lwkt_gettoken(&tty_token);
1123
1124         struct ucom_softc *sc = (struct ucom_softc *)p;
1125         struct tty *tp = sc->sc_tty;
1126         int (*rint) (int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1127         usbd_status err;
1128         u_int32_t cc;
1129         u_char *cp;
1130         int lostcc;
1131
1132         DPRINTF(("ucomreadcb: status = %d\n", status));
1133
1134         if (status != USBD_NORMAL_COMPLETION) {
1135                 if (!(sc->sc_state & UCS_RXSTOP))
1136                         kprintf("%s: ucomreadcb: %s\n",
1137                                device_get_nameunit(sc->sc_dev), usbd_errstr(status));
1138                 if (status == USBD_STALLED)
1139                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1140                 /* XXX we should restart after some delay. */
1141                 lwkt_reltoken(&tty_token);
1142                 return;
1143         }
1144
1145         usbd_get_xfer_status(xfer, NULL, (void **)&cp, &cc, NULL);
1146         DPRINTF(("ucomreadcb: got %d chars, tp = %p\n", cc, tp));
1147         if (cc == 0)
1148                 goto resubmit;
1149
1150         if (sc->sc_callback->ucom_read != NULL) {
1151                 sc->sc_callback->ucom_read(sc->sc_parent, sc->sc_portno,
1152                                            &cp, &cc);
1153         }
1154
1155         if (cc > sc->sc_ibufsize) {
1156                 kprintf("%s: invalid receive data size, %d chars\n",
1157                         device_get_nameunit(sc->sc_dev), cc);
1158                 goto resubmit;
1159         }
1160         if (cc < 1)
1161                 goto resubmit;
1162
1163         crit_enter();
1164         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1165                 if (tp->t_rawq.c_cc + cc > tp->t_ihiwat
1166                     && (sc->sc_state & UCS_RTS_IFLOW
1167                         || tp->t_iflag & IXOFF)
1168                     && !(tp->t_state & TS_TBLOCK))
1169                         ttyblock(tp);
1170                 lostcc = b_to_q((char *)cp, cc, &tp->t_rawq);
1171                 tp->t_rawcc += cc;
1172                 if (sc->hotchar) {
1173                         while (cc) {
1174                                 if (*cp == sc->hotchar)
1175                                         break;
1176                                 --cc;
1177                                 ++cp;
1178                         }
1179                         if (cc)
1180                                 setsofttty();
1181                 }
1182                 ttwakeup(tp);
1183                 if (tp->t_state & TS_TTSTOP
1184                     && (tp->t_iflag & IXANY
1185                         || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1186                         tp->t_state &= ~TS_TTSTOP;
1187                         tp->t_lflag &= ~FLUSHO;
1188                         ucomstart(tp);
1189                 }
1190                 if (lostcc > 0)
1191                         kprintf("%s: lost %d chars\n", device_get_nameunit(sc->sc_dev),
1192                                lostcc);
1193         } else {
1194                 /* Give characters to tty layer. */
1195                 while (cc > 0) {
1196                         DPRINTFN(7, ("ucomreadcb: char = 0x%02x\n", *cp));
1197                         if ((*rint)(*cp, tp) == -1) {
1198                                 /* XXX what should we do? */
1199                                 kprintf("%s: lost %d chars\n",
1200                                        device_get_nameunit(sc->sc_dev), cc);
1201                                 break;
1202                         }
1203                         cc--;
1204                         cp++;
1205                 }
1206         }
1207         crit_exit();
1208
1209 resubmit:
1210         err = ucomstartread(sc);
1211         if (err) {
1212                 kprintf("%s: read start failed\n", device_get_nameunit(sc->sc_dev));
1213                 /* XXX what should we dow now? */
1214         }
1215
1216         if ((sc->sc_state & UCS_RTS_IFLOW) && !ISSET(sc->sc_mcr, UMCR_RTS)
1217             && !(tp->t_state & TS_TBLOCK))
1218                 ucomctl(sc, UMCR_RTS, DMBIS);
1219
1220         lwkt_reltoken(&tty_token);
1221 }
1222
1223 /*
1224  * NOTE: Must be called with tty_token held.
1225  */
1226 static void
1227 ucom_cleanup(struct ucom_softc *sc)
1228 {
1229         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1230         DPRINTF(("ucom_cleanup: closing pipes\n"));
1231
1232         ucom_shutdown(sc);
1233         if (sc->sc_bulkin_pipe != NULL) {
1234                 usbd_abort_pipe(sc->sc_bulkin_pipe);
1235                 usbd_close_pipe(sc->sc_bulkin_pipe);
1236                 sc->sc_bulkin_pipe = NULL;
1237         }
1238         if (sc->sc_bulkout_pipe != NULL) {
1239                 usbd_abort_pipe(sc->sc_bulkout_pipe);
1240                 usbd_close_pipe(sc->sc_bulkout_pipe);
1241                 sc->sc_bulkout_pipe = NULL;
1242         }
1243         if (sc->sc_ixfer != NULL) {
1244                 usbd_free_xfer(sc->sc_ixfer);
1245                 sc->sc_ixfer = NULL;
1246         }
1247         if (sc->sc_oxfer != NULL) {
1248                 usbd_free_xfer(sc->sc_oxfer);
1249                 sc->sc_oxfer = NULL;
1250         }
1251 }
1252
1253 /*
1254  * NOTE: Must be called with tty_token held.
1255  */
1256 static void
1257 ucomstopread(struct ucom_softc *sc)
1258 {
1259         usbd_status err;
1260
1261         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1262         DPRINTF(("ucomstopread: enter\n"));
1263
1264         if (!(sc->sc_state & UCS_RXSTOP)) {
1265                 sc->sc_state |= UCS_RXSTOP;
1266                 if (sc->sc_bulkin_pipe == NULL) {
1267                         DPRINTF(("ucomstopread: bulkin pipe NULL\n"));
1268                         return;
1269                 }
1270                 err = usbd_abort_pipe(sc->sc_bulkin_pipe);
1271                 if (err) {
1272                         DPRINTF(("ucomstopread: err = %s\n",
1273                                  usbd_errstr(err)));
1274                 }
1275         }
1276
1277         DPRINTF(("ucomstopread: leave\n"));
1278 }
1279
1280 /*
1281  * NOTE: Must be called with tty_token held.
1282  */
1283 static void
1284 disc_optim(struct tty *tp, struct termios *t, struct ucom_softc *sc)
1285 {
1286         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1287         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
1288             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
1289             && (!(t->c_iflag & PARMRK)
1290                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
1291             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
1292             && linesw[tp->t_line].l_rint == ttyinput) {
1293                 DPRINTF(("disc_optim: bypass l_rint\n"));
1294                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
1295         } else {
1296                 DPRINTF(("disc_optim: can't bypass l_rint\n"));
1297                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
1298         }
1299         sc->hotchar = linesw[tp->t_line].l_hotchar;
1300 }