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  */
   8 /*-
   9  * Copyright (c) 2001-2002, Shunsuke Akiyama <akiyama@jp.FreeBSD.org>.
  10  * All rights reserved.
  11  *
  12  * Redistribution and use in source and binary forms, with or without
  13  * modification, are permitted provided that the following conditions
  14  * are met:
  15  * 1. Redistributions of source code must retain the above copyright
  16  *    notice, this list of conditions and the following disclaimer.
  17  * 2. Redistributions in binary form must reproduce the above copyright
  18  *    notice, this list of conditions and the following disclaimer in the
  19  *    documentation and/or other materials provided with the distribution.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
  36  * All rights reserved.
  37  *
  38  * This code is derived from software contributed to The NetBSD Foundation
  39  * by Lennart Augustsson (lennart@augustsson.net) at
  40  * Carlstedt Research & Technology.
  41  *
  42  * Redistribution and use in source and binary forms, with or without
  43  * modification, are permitted provided that the following conditions
  44  * are met:
  45  * 1. Redistributions of source code must retain the above copyright
  46  *    notice, this list of conditions and the following disclaimer.
  47  * 2. Redistributions in binary form must reproduce the above copyright
  48  *    notice, this list of conditions and the following disclaimer in the
  49  *    documentation and/or other materials provided with the distribution.
  50  * 3. All advertising materials mentioning features or use of this software
  51  *    must display the following acknowledgement:
  52  *        This product includes software developed by the NetBSD
  53  *        Foundation, Inc. and its contributors.
  54  * 4. Neither the name of The NetBSD Foundation nor the names of its
  55  *    contributors may be used to endorse or promote products derived
  56  *    from this software without specific prior written permission.
  57  *
  58  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  59  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  60  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  61  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  62  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  63  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  64  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  65  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  66  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  67  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  68  * POSSIBILITY OF SUCH DAMAGE.
  69  */
  70
  71 #include <sys/param.h>
  72 #include <sys/systm.h>
  73 #include <sys/kernel.h>
  74 #include <sys/malloc.h>
  75 #include <sys/bus.h>
  76 #include <sys/fcntl.h>
  77 #include <sys/conf.h>
  78 #include <sys/tty.h>
  79 #include <sys/clist.h>
  80 #include <sys/file.h>
  81 #include <sys/proc.h>
  82 #include <sys/priv.h>
  83 #include <sys/sysctl.h>
  84 #include <sys/thread2.h>
  85
  86 #include <bus/usb/usb.h>
  87 #include <bus/usb/usbcdc.h>
  88
  89 #include <bus/usb/usbdi.h>
  90 #include <bus/usb/usbdi_util.h>
  91 #include <bus/usb/usb_quirks.h>
  92
  93 #include "ucomvar.h"
  94
  95 #ifdef USB_DEBUG
  96 static int      ucomdebug = 0;
  97 SYSCTL_NODE(_hw_usb, OID_AUTO, ucom, CTLFLAG_RW, 0, "USB ucom");
  98 SYSCTL_INT(_hw_usb_ucom, OID_AUTO, debug, CTLFLAG_RW,
  99            &ucomdebug, 0, "ucom debug level");
 100 #define DPRINTF(x)      do { \
 101                                 if (ucomdebug) \
 102                                         kprintf x; \
 103                         } while (0)
 104
 105 #define DPRINTFN(n, x)  do { \
 106                                 if (ucomdebug > (n)) \
 107                                         kprintf x; \
 108                         } while (0)
 109 #else
 110 #define DPRINTF(x)
 111 #define DPRINTFN(n, x)
 112 #endif
 113
 114 static d_open_t  ucomopen;
 115 static d_close_t ucomclose;
 116 static d_read_t  ucomread;
 117 static d_write_t ucomwrite;
 118 static d_ioctl_t ucomioctl;
 119
 120 static struct dev_ops ucom_ops = {
 121         { "ucom", 0, D_TTY },
 122         .d_open =       ucomopen,
 123         .d_close =      ucomclose,
 124         .d_read =       ucomread,
 125         .d_write =      ucomwrite,
 126         .d_ioctl =      ucomioctl,
 127         .d_kqfilter =   ttykqfilter,
 128         .d_revoke =     ttyrevoke
 129 };
 130
 131 static void ucom_cleanup(struct ucom_softc *);
 132 static int ucomctl(struct ucom_softc *, int, int);
 133 static int ucomparam(struct tty *, struct termios *);
 134 static void ucomstart(struct tty *);
 135 static void ucomstop(struct tty *, int);
 136 static void ucom_shutdown(struct ucom_softc *);
 137 static void ucom_dtr(struct ucom_softc *, int);
 138 static void ucom_rts(struct ucom_softc *, int);
 139 static void ucom_break(struct ucom_softc *, int);
 140 static usbd_status ucomstartread(struct ucom_softc *);
 141 static void ucomreadcb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 142 static void ucomwritecb(usbd_xfer_handle, usbd_private_handle, usbd_status);
 143 static void ucomstopread(struct ucom_softc *);
 144 static void disc_optim(struct tty *, struct termios *, struct ucom_softc *);
 145
 146 devclass_t ucom_devclass;
 147
 148 static moduledata_t ucom_mod = {
 149         "ucom",
 150         NULL,
 151         NULL
 152 };
 153
 154 DECLARE_MODULE(ucom, ucom_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
 155 MODULE_DEPEND(ucom, usb, 1, 1, 1);
 156 MODULE_VERSION(ucom, UCOM_MODVER);
 157
 158 int
 159 ucom_attach(struct ucom_softc *sc)
 160 {
 161         struct tty *tp;
 162         int unit;
 163         cdev_t dev;
 164
 165         lwkt_gettoken(&tty_token);
 166         unit = device_get_unit(sc->sc_dev);
 167
 168         sc->sc_tty = tp = ttymalloc(sc->sc_tty);
 169         tp->t_oproc = ucomstart;
 170         tp->t_param = ucomparam;
 171         tp->t_stop = ucomstop;
 172
 173         DPRINTF(("ucom_attach: tty_attach tp = %p\n", tp));
 174
 175         DPRINTF(("ucom_attach: make_dev: ucom%d\n", unit));
 176
 177         dev = make_dev(&ucom_ops, unit | UCOM_CALLOUT_MASK,
 178                         UID_UUCP, GID_DIALER, 0660,
 179                         "ucom%d", unit);
 180         dev->si_tty = tp;
 181         sc->dev = dev;
 182         lwkt_reltoken(&tty_token);
 183
 184         return (0);
 185 }
 186
 187 int
 188 ucom_detach(struct ucom_softc *sc)
 189 {
 190         struct tty *tp = sc->sc_tty;
 191         int unit;
 192
 193         DPRINTF(("ucom_detach: sc = %p, tp = %p\n", sc, sc->sc_tty));
 194
 195         destroy_dev(sc->dev);
 196         lwkt_gettoken(&tty_token);
 197         sc->sc_dying = 1;
 198
 199         if (sc->sc_bulkin_pipe != NULL)
 200                 usbd_abort_pipe(sc->sc_bulkin_pipe);
 201         if (sc->sc_bulkout_pipe != NULL)
 202                 usbd_abort_pipe(sc->sc_bulkout_pipe);
 203
 204         if (tp != NULL) {
 205                 if (tp->t_state & TS_ISOPEN) {
 206                         device_printf(sc->sc_dev,
 207                                       "still open, forcing close\n");
 208                         (*linesw[tp->t_line].l_close)(tp, 0);
 209                         ttyclose(tp);
 210                 }
 211         } else {
 212                 DPRINTF(("ucom_detach: no tty\n"));
 213                 lwkt_reltoken(&tty_token);
 214                 return (0);
 215         }
 216
 217         crit_enter();
 218         if (--sc->sc_refcnt >= 0) {
 219                 /* Wait for processes to go away. */
 220                 usb_detach_wait(sc->sc_dev);
 221         }
 222         crit_exit();
 223
 224         unit = device_get_unit(sc->sc_dev);
 225         dev_ops_remove_minor(&ucom_ops, /*UCOMUNIT_MASK, */unit);
 226
 227         lwkt_reltoken(&tty_token);
 228         return (0);
 229 }
 230
 231 static void
 232 ucom_shutdown(struct ucom_softc *sc)
 233 {
 234         struct tty *tp = sc->sc_tty;
 235
 236         lwkt_gettoken(&tty_token);
 237         DPRINTF(("ucom_shutdown\n"));
 238         /*
 239          * Hang up if necessary.  Wait a bit, so the other side has time to
 240          * notice even if we immediately open the port again.
 241          */
 242         if (ISSET(tp->t_cflag, HUPCL)) {
 243                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 244                 (void)tsleep(sc, 0, "ucomsd", hz);
 245         }
 246         lwkt_reltoken(&tty_token);
 247 }
 248
 249 static int
 250 ucomopen(struct dev_open_args *ap)
 251 {
 252         cdev_t dev = ap->a_head.a_dev;
 253         int unit = UCOMUNIT(dev);
 254         struct ucom_softc *sc;
 255         usbd_status err;
 256         struct tty *tp;
 257         int error;
 258
 259         sc = devclass_get_softc(ucom_devclass, unit);
 260         if (sc == NULL)
 261                 return (ENXIO);
 262
 263         if (sc->sc_dying)
 264                 return (ENXIO);
 265
 266         lwkt_gettoken(&tty_token);
 267         tp = sc->sc_tty;
 268
 269         DPRINTF(("%s: ucomopen: tp = %p\n", device_get_nameunit(sc->sc_dev), tp));
 270
 271         if (ISSET(tp->t_state, TS_ISOPEN) &&
 272             ISSET(tp->t_state, TS_XCLUDE) &&
 273             priv_check_cred(ap->a_cred, PRIV_ROOT, 0)
 274         ) {
 275                 lwkt_reltoken(&tty_token);
 276                 return (EBUSY);
 277         }
 278
 279         /*
 280          * Do the following iff this is a first open.
 281          */
 282         crit_enter();
 283         while (sc->sc_opening)
 284                 tsleep(&sc->sc_opening, 0, "ucomop", 0);
 285         sc->sc_opening = 1;
 286
 287         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 288                 struct termios t;
 289
 290                 sc->sc_poll = 0;
 291                 sc->sc_lsr = sc->sc_msr = sc->sc_mcr = 0;
 292
 293                 tp->t_dev = reference_dev(dev);
 294
 295                 /*
 296                  * Initialize the termios status to the defaults.  Add in the
 297                  * sticky bits from TIOCSFLAGS.
 298                  */
 299                 t.c_ispeed = 0;
 300                 t.c_ospeed = TTYDEF_SPEED;
 301                 t.c_cflag = TTYDEF_CFLAG;
 302                 /* Make sure ucomparam() will do something. */
 303                 tp->t_ospeed = 0;
 304                 (void)ucomparam(tp, &t);
 305                 tp->t_iflag = TTYDEF_IFLAG;
 306                 tp->t_oflag = TTYDEF_OFLAG;
 307                 tp->t_lflag = TTYDEF_LFLAG;
 308                 ttychars(tp);
 309                 ttsetwater(tp);
 310
 311                 /*
 312                  * Turn on DTR.  We must always do this, even if carrier is not
 313                  * present, because otherwise we'd have to use TIOCSDTR
 314                  * immediately after setting CLOCAL, which applications do not
 315                  * expect.  We always assert DTR while the device is open
 316                  * unless explicitly requested to deassert it.
 317                  */
 318                 (void)ucomctl(sc, TIOCM_DTR | TIOCM_RTS, DMBIS);
 319
 320                 /* Device specific open */
 321                 if (sc->sc_callback->ucom_open != NULL) {
 322                         error = sc->sc_callback->ucom_open(sc->sc_parent,
 323                                                            sc->sc_portno);
 324                         if (error) {
 325                                 ucom_cleanup(sc);
 326                                 sc->sc_opening = 0;
 327                                 wakeup(&sc->sc_opening);
 328                                 crit_exit();
 329                                 lwkt_reltoken(&tty_token);
 330                                 return (error);
 331                         }
 332                 }
 333
 334                 DPRINTF(("ucomopen: open pipes in = %d out = %d\n",
 335                          sc->sc_bulkin_no, sc->sc_bulkout_no));
 336
 337                 /* Open the bulk pipes */
 338                 /* Bulk-in pipe */
 339                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkin_no, 0,
 340                                      &sc->sc_bulkin_pipe);
 341                 if (err) {
 342                         kprintf("%s: open bulk in error (addr %d): %s\n",
 343                                device_get_nameunit(sc->sc_dev), sc->sc_bulkin_no,
 344                                usbd_errstr(err));
 345                         error = EIO;
 346                         goto fail_0;
 347                 }
 348                 /* Bulk-out pipe */
 349                 err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkout_no,
 350                                      USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
 351                 if (err) {
 352                         kprintf("%s: open bulk out error (addr %d): %s\n",
 353                                device_get_nameunit(sc->sc_dev), sc->sc_bulkout_no,
 354                                usbd_errstr(err));
 355                         error = EIO;
 356                         goto fail_1;
 357                 }
 358
 359                 /* Allocate a request and an input buffer and start reading. */
 360                 sc->sc_ixfer = usbd_alloc_xfer(sc->sc_udev);
 361                 if (sc->sc_ixfer == NULL) {
 362                         error = ENOMEM;
 363                         goto fail_2;
 364                 }
 365
 366                 sc->sc_ibuf = usbd_alloc_buffer(sc->sc_ixfer,
 367                                                 sc->sc_ibufsizepad);
 368                 if (sc->sc_ibuf == NULL) {
 369                         error = ENOMEM;
 370                         goto fail_3;
 371                 }
 372
 373                 sc->sc_oxfer = usbd_alloc_xfer(sc->sc_udev);
 374                 if (sc->sc_oxfer == NULL) {
 375                         error = ENOMEM;
 376                         goto fail_3;
 377                 }
 378
 379                 sc->sc_obuf = usbd_alloc_buffer(sc->sc_oxfer,
 380                                                 sc->sc_obufsize +
 381                                                 sc->sc_opkthdrlen);
 382                 if (sc->sc_obuf == NULL) {
 383                         error = ENOMEM;
 384                         goto fail_4;
 385                 }
 386
 387                 /*
 388                  * Handle initial DCD.
 389                  */
 390                 if (ISSET(sc->sc_msr, UMSR_DCD) ||
 391                     (minor(dev) & UCOM_CALLOUT_MASK))
 392                         (*linesw[tp->t_line].l_modem)(tp, 1);
 393
 394                 ucomstartread(sc);
 395         }
 396
 397         sc->sc_opening = 0;
 398         wakeup(&sc->sc_opening);
 399         crit_exit();
 400
 401         error = ttyopen(dev, tp);
 402         if (error)
 403                 goto bad;
 404
 405         error = (*linesw[tp->t_line].l_open)(dev, tp);
 406         if (error)
 407                 goto bad;
 408
 409         disc_optim(tp, &tp->t_termios, sc);
 410
 411         DPRINTF(("%s: ucomopen: success\n", device_get_nameunit(sc->sc_dev)));
 412
 413         sc->sc_poll = 1;
 414         sc->sc_refcnt++;
 415
 416         lwkt_reltoken(&tty_token);
 417         return (0);
 418
 419 fail_4:
 420         usbd_free_xfer(sc->sc_oxfer);
 421         sc->sc_oxfer = NULL;
 422 fail_3:
 423         usbd_free_xfer(sc->sc_ixfer);
 424         sc->sc_ixfer = NULL;
 425 fail_2:
 426         usbd_close_pipe(sc->sc_bulkout_pipe);
 427         sc->sc_bulkout_pipe = NULL;
 428 fail_1:
 429         usbd_close_pipe(sc->sc_bulkin_pipe);
 430         sc->sc_bulkin_pipe = NULL;
 431 fail_0:
 432         sc->sc_opening = 0;
 433         wakeup(&sc->sc_opening);
 434         crit_exit();
 435         lwkt_reltoken(&tty_token);
 436         return (error);
 437
 438 bad:
 439         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 440                 /*
 441                  * We failed to open the device, and nobody else had it opened.
 442                  * Clean up the state as appropriate.
 443                  */
 444                 ucom_cleanup(sc);
 445         }
 446
 447         DPRINTF(("%s: ucomopen: failed\n", device_get_nameunit(sc->sc_dev)));
 448
 449         lwkt_reltoken(&tty_token);
 450         return (error);
 451 }
 452
 453 static int
 454 ucomclose(struct dev_close_args *ap)
 455 {
 456         cdev_t dev = ap->a_head.a_dev;
 457         struct ucom_softc *sc;
 458         struct tty *tp;
 459
 460         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 461
 462         lwkt_gettoken(&tty_token);
 463         tp = sc->sc_tty;
 464
 465         DPRINTF(("%s: ucomclose: unit = %d\n",
 466                 device_get_nameunit(sc->sc_dev), UCOMUNIT(dev)));
 467
 468         if (!ISSET(tp->t_state, TS_ISOPEN))
 469                 goto quit;
 470
 471         crit_enter();
 472         (*linesw[tp->t_line].l_close)(tp, ap->a_fflag);
 473         disc_optim(tp, &tp->t_termios, sc);
 474         ttyclose(tp);
 475         crit_exit();
 476
 477         if (sc->sc_dying)
 478                 goto quit;
 479
 480         if (!ISSET(tp->t_state, TS_ISOPEN)) {
 481                 /*
 482                  * Although we got a last close, the device may still be in
 483                  * use; e.g. if this was the dialout node, and there are still
 484                  * processes waiting for carrier on the non-dialout node.
 485                  */
 486                 ucom_cleanup(sc);
 487         }
 488
 489         if (sc->sc_callback->ucom_close != NULL)
 490                 sc->sc_callback->ucom_close(sc->sc_parent, sc->sc_portno);
 491
 492 quit:
 493         if (tp->t_dev) {
 494                 release_dev(tp->t_dev);
 495                 tp->t_dev = NULL;
 496         }
 497
 498         if (--sc->sc_refcnt < 0)
 499                 usb_detach_wakeup(sc->sc_dev);
 500
 501         lwkt_reltoken(&tty_token);
 502         return (0);
 503 }
 504
 505 static int
 506 ucomread(struct dev_read_args *ap)
 507 {
 508         cdev_t dev = ap->a_head.a_dev;
 509         struct ucom_softc *sc;
 510         struct tty *tp;
 511         int error;
 512
 513         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 514         lwkt_gettoken(&tty_token);
 515         tp = sc->sc_tty;
 516
 517         DPRINTF(("ucomread: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 518
 519         if (sc->sc_dying) {
 520                 lwkt_reltoken(&tty_token);
 521                 return (EIO);
 522         }
 523
 524         error = (*linesw[tp->t_line].l_read)(tp, ap->a_uio, ap->a_ioflag);
 525
 526         DPRINTF(("ucomread: error = %d\n", error));
 527
 528         lwkt_reltoken(&tty_token);
 529         return (error);
 530 }
 531
 532 static int
 533 ucomwrite(struct dev_write_args *ap)
 534 {
 535         cdev_t dev = ap->a_head.a_dev;
 536         struct ucom_softc *sc;
 537         struct tty *tp;
 538         int error;
 539
 540         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 541         lwkt_gettoken(&tty_token);
 542         tp = sc->sc_tty;
 543
 544         DPRINTF(("ucomwrite: tp = %p, flag = 0x%x\n", tp, ap->a_ioflag));
 545
 546         if (sc->sc_dying) {
 547                 lwkt_reltoken(&tty_token);
 548                 return (EIO);
 549         }
 550
 551         error = (*linesw[tp->t_line].l_write)(tp, ap->a_uio, ap->a_ioflag);
 552
 553         DPRINTF(("ucomwrite: error = %d\n", error));
 554
 555         lwkt_reltoken(&tty_token);
 556         return (error);
 557 }
 558
 559 static int
 560 ucomioctl(struct dev_ioctl_args *ap)
 561 {
 562         cdev_t dev = ap->a_head.a_dev;
 563         struct ucom_softc *sc;
 564         struct tty *tp;
 565         int error;
 566         int d;
 567
 568         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(dev));
 569         lwkt_gettoken(&tty_token);
 570         tp = sc->sc_tty;
 571
 572         if (sc->sc_dying) {
 573                 lwkt_reltoken(&tty_token);
 574                 return (EIO);
 575         }
 576
 577         DPRINTF(("ucomioctl: cmd = 0x%08lx\n", ap->a_cmd));
 578
 579         error = (*linesw[tp->t_line].l_ioctl)(tp, ap->a_cmd, ap->a_data,
 580                                               ap->a_fflag, ap->a_cred);
 581         if (error != ENOIOCTL) {
 582                 DPRINTF(("ucomioctl: l_ioctl: error = %d\n", error));
 583                 lwkt_reltoken(&tty_token);
 584                 return (error);
 585         }
 586
 587         crit_enter();
 588
 589         error = ttioctl(tp, ap->a_cmd, ap->a_data, ap->a_fflag);
 590         disc_optim(tp, &tp->t_termios, sc);
 591         if (error != ENOIOCTL) {
 592                 crit_exit();
 593                 DPRINTF(("ucomioctl: ttioctl: error = %d\n", error));
 594                 lwkt_reltoken(&tty_token);
 595                 return (error);
 596         }
 597
 598         if (sc->sc_callback->ucom_ioctl != NULL) {
 599                 error = sc->sc_callback->ucom_ioctl(sc->sc_parent,
 600                                                     sc->sc_portno,
 601                                                     ap->a_cmd, ap->a_data,
 602                                                     ap->a_fflag, curthread);
 603                 if (error >= 0) {
 604                         crit_exit();
 605                         lwkt_reltoken(&tty_token);
 606                         return (error);
 607                 }
 608         }
 609
 610         error = 0;
 611
 612         DPRINTF(("ucomioctl: our cmd = 0x%08lx\n", ap->a_cmd));
 613
 614         switch (ap->a_cmd) {
 615         case TIOCSBRK:
 616                 DPRINTF(("ucomioctl: TIOCSBRK\n"));
 617                 ucom_break(sc, 1);
 618                 break;
 619         case TIOCCBRK:
 620                 DPRINTF(("ucomioctl: TIOCCBRK\n"));
 621                 ucom_break(sc, 0);
 622                 break;
 623
 624         case TIOCSDTR:
 625                 DPRINTF(("ucomioctl: TIOCSDTR\n"));
 626                 (void)ucomctl(sc, TIOCM_DTR, DMBIS);
 627                 break;
 628         case TIOCCDTR:
 629                 DPRINTF(("ucomioctl: TIOCCDTR\n"));
 630                 (void)ucomctl(sc, TIOCM_DTR, DMBIC);
 631                 break;
 632
 633         case TIOCMSET:
 634                 d = *(int *)ap->a_data;
 635                 DPRINTF(("ucomioctl: TIOCMSET, 0x%x\n", d));
 636                 (void)ucomctl(sc, d, DMSET);
 637                 break;
 638         case TIOCMBIS:
 639                 d = *(int *)ap->a_data;
 640                 DPRINTF(("ucomioctl: TIOCMBIS, 0x%x\n", d));
 641                 (void)ucomctl(sc, d, DMBIS);
 642                 break;
 643         case TIOCMBIC:
 644                 d = *(int *)ap->a_data;
 645                 DPRINTF(("ucomioctl: TIOCMBIC, 0x%x\n", d));
 646                 (void)ucomctl(sc, d, DMBIC);
 647                 break;
 648         case TIOCMGET:
 649                 d = ucomctl(sc, 0, DMGET);
 650                 DPRINTF(("ucomioctl: TIOCMGET, 0x%x\n", d));
 651                 *(int *)ap->a_data = d;
 652                 break;
 653
 654         default:
 655                 DPRINTF(("ucomioctl: error: our cmd = 0x%08lx\n", ap->a_cmd));
 656                 error = ENOTTY;
 657                 break;
 658         }
 659
 660         crit_exit();
 661
 662         lwkt_reltoken(&tty_token);
 663         return (error);
 664 }
 665
 666 /*
 667  * NOTE: Must be called with tty_token held.
 668  */
 669 static int
 670 ucomctl(struct ucom_softc *sc, int bits, int how)
 671 {
 672         int     mcr;
 673         int     msr;
 674         int     onoff;
 675
 676         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 677         DPRINTF(("ucomctl: bits = 0x%x, how = %d\n", bits, how));
 678
 679         if (how == DMGET) {
 680                 SET(bits, TIOCM_LE);            /* always set TIOCM_LE bit */
 681                 DPRINTF(("ucomctl: DMGET: LE"));
 682
 683                 mcr = sc->sc_mcr;
 684                 if (ISSET(mcr, UMCR_DTR)) {
 685                         SET(bits, TIOCM_DTR);
 686                         DPRINTF((" DTR"));
 687                 }
 688                 if (ISSET(mcr, UMCR_RTS)) {
 689                         SET(bits, TIOCM_RTS);
 690                         DPRINTF((" RTS"));
 691                 }
 692
 693                 msr = sc->sc_msr;
 694                 if (ISSET(msr, UMSR_CTS)) {
 695                         SET(bits, TIOCM_CTS);
 696                         DPRINTF((" CTS"));
 697                 }
 698                 if (ISSET(msr, UMSR_DCD)) {
 699                         SET(bits, TIOCM_CD);
 700                         DPRINTF((" CD"));
 701                 }
 702                 if (ISSET(msr, UMSR_DSR)) {
 703                         SET(bits, TIOCM_DSR);
 704                         DPRINTF((" DSR"));
 705                 }
 706                 if (ISSET(msr, UMSR_RI)) {
 707                         SET(bits, TIOCM_RI);
 708                         DPRINTF((" RI"));
 709                 }
 710
 711                 DPRINTF(("\n"));
 712
 713                 return (bits);
 714         }
 715
 716         mcr = 0;
 717         if (ISSET(bits, TIOCM_DTR))
 718                 SET(mcr, UMCR_DTR);
 719         if (ISSET(bits, TIOCM_RTS))
 720                 SET(mcr, UMCR_RTS);
 721
 722         switch (how) {
 723         case DMSET:
 724                 sc->sc_mcr = mcr;
 725                 break;
 726         case DMBIS:
 727                 sc->sc_mcr |= mcr;
 728                 break;
 729         case DMBIC:
 730                 sc->sc_mcr &= ~mcr;
 731                 break;
 732         }
 733
 734         onoff = ISSET(sc->sc_mcr, UMCR_DTR) ? 1 : 0;
 735         ucom_dtr(sc, onoff);
 736
 737         onoff = ISSET(sc->sc_mcr, UMCR_RTS) ? 1 : 0;
 738         ucom_rts(sc, onoff);
 739
 740         return (0);
 741 }
 742
 743 /*
 744  * NOTE: Must be called with tty_token held.
 745  */
 746 static void
 747 ucom_break(struct ucom_softc *sc, int onoff)
 748 {
 749         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 750         DPRINTF(("ucom_break: onoff = %d\n", onoff));
 751
 752         if (sc->sc_callback->ucom_set == NULL)
 753                 return;
 754         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 755                                   UCOM_SET_BREAK, onoff);
 756 }
 757
 758 /*
 759  * NOTE: Must be called with tty_token held.
 760  */
 761 static void
 762 ucom_dtr(struct ucom_softc *sc, int onoff)
 763 {
 764         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 765         DPRINTF(("ucom_dtr: onoff = %d\n", onoff));
 766
 767         if (sc->sc_callback->ucom_set == NULL)
 768                 return;
 769         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 770                                   UCOM_SET_DTR, onoff);
 771 }
 772
 773 /*
 774  * NOTE: Must be called with tty_token held.
 775  */
 776 static void
 777 ucom_rts(struct ucom_softc *sc, int onoff)
 778 {
 779         ASSERT_LWKT_TOKEN_HELD(&tty_token);
 780         DPRINTF(("ucom_rts: onoff = %d\n", onoff));
 781
 782         if (sc->sc_callback->ucom_set == NULL)
 783                 return;
 784         sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
 785                                   UCOM_SET_RTS, onoff);
 786 }
 787
 788 void
 789 ucom_status_change(struct ucom_softc *sc)
 790 {
 791         struct tty *tp = sc->sc_tty;
 792         u_char old_msr;
 793         int onoff;
 794
 795         lwkt_gettoken(&tty_token);
 796         if (sc->sc_callback->ucom_get_status == NULL) {
 797                 sc->sc_lsr = 0;
 798                 sc->sc_msr = 0;
 799                 lwkt_reltoken(&tty_token);
 800                 return;
 801         }
 802
 803         old_msr = sc->sc_msr;
 804         sc->sc_callback->ucom_get_status(sc->sc_parent, sc->sc_portno,
 805                                          &sc->sc_lsr, &sc->sc_msr);
 806         if (ISSET((sc->sc_msr ^ old_msr), UMSR_DCD)) {
 807                 if (sc->sc_poll == 0) {
 808                         lwkt_reltoken(&tty_token);
 809                         return;
 810                 }
 811                 onoff = ISSET(sc->sc_msr, UMSR_DCD) ? 1 : 0;
 812                 DPRINTF(("ucom_status_change: DCD changed to %d\n", onoff));
 813                 (*linesw[tp->t_line].l_modem)(tp, onoff);
 814         }
 815         lwkt_reltoken(&tty_token);
 816 }
 817
 818 static int
 819 ucomparam(struct tty *tp, struct termios *t)
 820 {
 821         struct ucom_softc *sc;
 822         int error;
 823         usbd_status uerr;
 824
 825         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 826
 827         lwkt_gettoken(&tty_token);
 828         if (sc->sc_dying) {
 829                 lwkt_reltoken(&tty_token);
 830                 return (EIO);
 831         }
 832
 833         DPRINTF(("ucomparam: sc = %p\n", sc));
 834
 835         /* Check requested parameters. */
 836         if (t->c_ospeed < 0) {
 837                 DPRINTF(("ucomparam: negative ospeed\n"));
 838                 lwkt_reltoken(&tty_token);
 839                 return (EINVAL);
 840         }
 841         if (t->c_ispeed && t->c_ispeed != t->c_ospeed) {
 842                 DPRINTF(("ucomparam: mismatch ispeed and ospeed\n"));
 843                 lwkt_reltoken(&tty_token);
 844                 return (EINVAL);
 845         }
 846
 847         /*
 848          * If there were no changes, don't do anything.  This avoids dropping
 849          * input and improves performance when all we did was frob things like
 850          * VMIN and VTIME.
 851          */
 852         if (tp->t_ospeed == t->c_ospeed &&
 853             tp->t_cflag == t->c_cflag) {
 854                 lwkt_reltoken(&tty_token);
 855                 return (0);
 856         }
 857
 858         /* And copy to tty. */
 859         tp->t_ispeed = 0;
 860         tp->t_ospeed = t->c_ospeed;
 861         tp->t_cflag = t->c_cflag;
 862
 863         if (sc->sc_callback->ucom_param == NULL) {
 864                 lwkt_reltoken(&tty_token);
 865                 return (0);
 866         }
 867
 868         ucomstopread(sc);
 869
 870         error = sc->sc_callback->ucom_param(sc->sc_parent, sc->sc_portno, t);
 871         if (error) {
 872                 DPRINTF(("ucomparam: callback: error = %d\n", error));
 873                 lwkt_reltoken(&tty_token);
 874                 return (error);
 875         }
 876
 877         ttsetwater(tp);
 878
 879         if (t->c_cflag & CRTS_IFLOW) {
 880                 sc->sc_state |= UCS_RTS_IFLOW;
 881         } else if (sc->sc_state & UCS_RTS_IFLOW) {
 882                 sc->sc_state &= ~UCS_RTS_IFLOW;
 883                 (void)ucomctl(sc, UMCR_RTS, DMBIS);
 884         }
 885
 886         disc_optim(tp, t, sc);
 887
 888         uerr = ucomstartread(sc);
 889         if (uerr != USBD_NORMAL_COMPLETION) {
 890                 lwkt_reltoken(&tty_token);
 891                 return (EIO);
 892         }
 893
 894         lwkt_reltoken(&tty_token);
 895         return (0);
 896 }
 897
 898 static void
 899 ucomstart(struct tty *tp)
 900 {
 901         struct ucom_softc *sc;
 902         struct cblock *cbp;
 903         usbd_status err;
 904         u_char *data;
 905         int cnt;
 906
 907         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
 908         DPRINTF(("ucomstart: sc = %p\n", sc));
 909
 910         lwkt_gettoken(&tty_token);
 911
 912         if (sc->sc_dying) {
 913                 lwkt_reltoken(&tty_token);
 914                 return;
 915         }
 916
 917         crit_enter();
 918
 919         if (tp->t_state & TS_TBLOCK) {
 920                 if (ISSET(sc->sc_mcr, UMCR_RTS) &&
 921                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 922                         DPRINTF(("ucomstart: clear RTS\n"));
 923                         (void)ucomctl(sc, UMCR_RTS, DMBIC);
 924                 }
 925         } else {
 926                 if (!ISSET(sc->sc_mcr, UMCR_RTS) &&
 927                     tp->t_rawq.c_cc <= tp->t_ilowat &&
 928                     ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
 929                         DPRINTF(("ucomstart: set RTS\n"));
 930                         (void)ucomctl(sc, UMCR_RTS, DMBIS);
 931                 }
 932         }
 933
 934         if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) {
 935                 ttwwakeup(tp);
 936                 DPRINTF(("ucomstart: stopped\n"));
 937                 goto out;
 938         }
 939
 940         if (tp->t_outq.c_cc <= tp->t_olowat) {
 941                 if (ISSET(tp->t_state, TS_SO_OLOWAT)) {
 942                         CLR(tp->t_state, TS_SO_OLOWAT);
 943                         wakeup(TSA_OLOWAT(tp));
 944                 }
 945                 KNOTE(&tp->t_wkq.ki_note, 0);
 946                 if (tp->t_outq.c_cc == 0) {
 947                         if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
 948                             TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
 949                                 CLR(tp->t_state, TS_SO_OCOMPLETE);
 950                                 wakeup(TSA_OCOMPLETE(tp));
 951                         }
 952                         goto out;
 953                 }
 954         }
 955
 956         /* Grab the first contiguous region of buffer space. */
 957         data = tp->t_outq.c_cf;
 958         cbp = (struct cblock *) ((intptr_t) tp->t_outq.c_cf & ~CROUND);
 959         cnt = min((char *) (cbp+1) - tp->t_outq.c_cf, tp->t_outq.c_cc);
 960
 961         if (cnt == 0) {
 962                 DPRINTF(("ucomstart: cnt == 0\n"));
 963                 goto out;
 964         }
 965
 966         SET(tp->t_state, TS_BUSY);
 967
 968         if (cnt > sc->sc_obufsize) {
 969                 DPRINTF(("ucomstart: big buffer %d chars\n", cnt));
 970                 cnt = sc->sc_obufsize;
 971         }
 972         if (sc->sc_callback->ucom_write != NULL)
 973                 sc->sc_callback->ucom_write(sc->sc_parent, sc->sc_portno,
 974                                             sc->sc_obuf, data, &cnt);
 975         else
 976                 memcpy(sc->sc_obuf, data, cnt);
 977
 978         DPRINTF(("ucomstart: %d chars\n", cnt));
 979         usbd_setup_xfer(sc->sc_oxfer, sc->sc_bulkout_pipe,
 980                         (usbd_private_handle)sc, sc->sc_obuf, cnt,
 981                         USBD_NO_COPY, USBD_NO_TIMEOUT, ucomwritecb);
 982         /* What can we do on error? */
 983         err = usbd_transfer(sc->sc_oxfer);
 984         if (err != USBD_IN_PROGRESS)
 985                 kprintf("ucomstart: err=%s\n", usbd_errstr(err));
 986
 987         ttwwakeup(tp);
 988
 989     out:
 990         crit_exit();
 991         lwkt_reltoken(&tty_token);
 992 }
 993
 994 static void
 995 ucomstop(struct tty *tp, int flag)
 996 {
 997         struct ucom_softc *sc;
 998
 999         sc = devclass_get_softc(ucom_devclass, UCOMUNIT(tp->t_dev));
1000
1001         DPRINTF(("ucomstop: %d\n", flag));
1002
1003         lwkt_gettoken(&tty_token);
1004         if (flag & FREAD) {
1005                 /*
1006                  * This is just supposed to flush pending receive data,
1007                  * not stop the reception of data entirely!
1008                  */
1009                 DPRINTF(("ucomstop: read\n"));
1010                 ucomstopread(sc);
1011                 ucomstartread(sc);
1012         }
1013
1014         if (flag & FWRITE) {
1015                 DPRINTF(("ucomstop: write\n"));
1016                 crit_enter();
1017                 if (ISSET(tp->t_state, TS_BUSY)) {
1018                         /* XXX do what? */
1019                         if (!ISSET(tp->t_state, TS_TTSTOP))
1020                                 SET(tp->t_state, TS_FLUSH);
1021                 }
1022                 crit_exit();
1023         }
1024
1025         DPRINTF(("ucomstop: done\n"));
1026         lwkt_reltoken(&tty_token);
1027 }
1028
1029 static void
1030 ucomwritecb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1031 {
1032         struct ucom_softc *sc = (struct ucom_softc *)p;
1033         struct tty *tp = sc->sc_tty;
1034         u_int32_t cc;
1035
1036         lwkt_gettoken(&tty_token);
1037         DPRINTF(("ucomwritecb: status = %d\n", status));
1038
1039         if (status == USBD_CANCELLED || sc->sc_dying)
1040                 goto error;
1041
1042         if (status != USBD_NORMAL_COMPLETION) {
1043                 kprintf("%s: ucomwritecb: %s\n",
1044                        device_get_nameunit(sc->sc_dev), usbd_errstr(status));
1045                 if (status == USBD_STALLED)
1046                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1047                 /*
1048                  * XXX.  We may need a flag to sequence ucomstopread() and
1049                  * ucomstartread() to handle the case where ucomstartread()
1050                  * is called after ucomstopread() but before the request has
1051                  * been properly canceled?
1052                  */
1053                 goto error;
1054         }
1055
1056         usbd_get_xfer_status(xfer, NULL, NULL, &cc, NULL);
1057         DPRINTF(("ucomwritecb: cc = %d\n", cc));
1058         if (cc <= sc->sc_opkthdrlen) {
1059                 kprintf("%s: sent size too small, cc = %d\n",
1060                         device_get_nameunit(sc->sc_dev), cc);
1061                 goto error;
1062         }
1063
1064         /* convert from USB bytes to tty bytes */
1065         cc -= sc->sc_opkthdrlen;
1066
1067         crit_enter();
1068         CLR(tp->t_state, TS_BUSY);
1069         if (ISSET(tp->t_state, TS_FLUSH))
1070                 CLR(tp->t_state, TS_FLUSH);
1071         else
1072                 ndflush(&tp->t_outq, cc);
1073         (*linesw[tp->t_line].l_start)(tp);
1074         crit_exit();
1075
1076         lwkt_reltoken(&tty_token);
1077         return;
1078
1079   error:
1080         crit_enter();
1081         CLR(tp->t_state, TS_BUSY);
1082         crit_exit();
1083         lwkt_reltoken(&tty_token);
1084         return;
1085 }
1086
1087 /*
1088  * NOTE: Must be called with tty_token held
1089  */
1090 static usbd_status
1091 ucomstartread(struct ucom_softc *sc)
1092 {
1093         usbd_status err;
1094
1095         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1096         DPRINTF(("ucomstartread: start\n"));
1097
1098         sc->sc_state &= ~UCS_RXSTOP;
1099
1100         if (sc->sc_bulkin_pipe == NULL)
1101                 return (USBD_NORMAL_COMPLETION);
1102
1103         usbd_setup_xfer(sc->sc_ixfer, sc->sc_bulkin_pipe,
1104                         (usbd_private_handle)sc,
1105                         sc->sc_ibuf, sc->sc_ibufsize,
1106                         USBD_SHORT_XFER_OK | USBD_NO_COPY,
1107                         USBD_NO_TIMEOUT, ucomreadcb);
1108
1109         err = usbd_transfer(sc->sc_ixfer);
1110         if (err != USBD_IN_PROGRESS) {
1111                 DPRINTF(("ucomstartread: err = %s\n", usbd_errstr(err)));
1112                 return (err);
1113         }
1114
1115         return (USBD_NORMAL_COMPLETION);
1116 }
1117
1118 static void
1119 ucomreadcb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
1120 {
1121         lwkt_gettoken(&tty_token);
1122
1123         struct ucom_softc *sc = (struct ucom_softc *)p;
1124         struct tty *tp = sc->sc_tty;
1125         int (*rint) (int c, struct tty *tp) = linesw[tp->t_line].l_rint;
1126         usbd_status err;
1127         u_int32_t cc;
1128         u_char *cp;
1129         int lostcc;
1130
1131         DPRINTF(("ucomreadcb: status = %d\n", status));
1132
1133         if (status != USBD_NORMAL_COMPLETION) {
1134                 if (!(sc->sc_state & UCS_RXSTOP))
1135                         kprintf("%s: ucomreadcb: %s\n",
1136                                device_get_nameunit(sc->sc_dev), usbd_errstr(status));
1137                 if (status == USBD_STALLED)
1138                         usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
1139                 /* XXX we should restart after some delay. */
1140                 lwkt_reltoken(&tty_token);
1141                 return;
1142         }
1143
1144         usbd_get_xfer_status(xfer, NULL, (void **)&cp, &cc, NULL);
1145         DPRINTF(("ucomreadcb: got %d chars, tp = %p\n", cc, tp));
1146         if (cc == 0)
1147                 goto resubmit;
1148
1149         if (sc->sc_callback->ucom_read != NULL) {
1150                 sc->sc_callback->ucom_read(sc->sc_parent, sc->sc_portno,
1151                                            &cp, &cc);
1152         }
1153
1154         if (cc > sc->sc_ibufsize) {
1155                 kprintf("%s: invalid receive data size, %d chars\n",
1156                         device_get_nameunit(sc->sc_dev), cc);
1157                 goto resubmit;
1158         }
1159         if (cc < 1)
1160                 goto resubmit;
1161
1162         crit_enter();
1163         if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
1164                 if (tp->t_rawq.c_cc + cc > tp->t_ihiwat
1165                     && (sc->sc_state & UCS_RTS_IFLOW
1166                         || tp->t_iflag & IXOFF)
1167                     && !(tp->t_state & TS_TBLOCK))
1168                         ttyblock(tp);
1169                 lostcc = b_to_q((char *)cp, cc, &tp->t_rawq);
1170                 tp->t_rawcc += cc;
1171                 if (sc->hotchar) {
1172                         while (cc) {
1173                                 if (*cp == sc->hotchar)
1174                                         break;
1175                                 --cc;
1176                                 ++cp;
1177                         }
1178                         if (cc)
1179                                 setsofttty();
1180                 }
1181                 ttwakeup(tp);
1182                 if (tp->t_state & TS_TTSTOP
1183                     && (tp->t_iflag & IXANY
1184                         || tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
1185                         tp->t_state &= ~TS_TTSTOP;
1186                         tp->t_lflag &= ~FLUSHO;
1187                         ucomstart(tp);
1188                 }
1189                 if (lostcc > 0)
1190                         kprintf("%s: lost %d chars\n", device_get_nameunit(sc->sc_dev),
1191                                lostcc);
1192         } else {
1193                 /* Give characters to tty layer. */
1194                 while (cc > 0) {
1195                         DPRINTFN(7, ("ucomreadcb: char = 0x%02x\n", *cp));
1196                         if ((*rint)(*cp, tp) == -1) {
1197                                 /* XXX what should we do? */
1198                                 kprintf("%s: lost %d chars\n",
1199                                        device_get_nameunit(sc->sc_dev), cc);
1200                                 break;
1201                         }
1202                         cc--;
1203                         cp++;
1204                 }
1205         }
1206         crit_exit();
1207
1208 resubmit:
1209         err = ucomstartread(sc);
1210         if (err) {
1211                 kprintf("%s: read start failed\n", device_get_nameunit(sc->sc_dev));
1212                 /* XXX what should we dow now? */
1213         }
1214
1215         if ((sc->sc_state & UCS_RTS_IFLOW) && !ISSET(sc->sc_mcr, UMCR_RTS)
1216             && !(tp->t_state & TS_TBLOCK))
1217                 ucomctl(sc, UMCR_RTS, DMBIS);
1218
1219         lwkt_reltoken(&tty_token);
1220 }
1221
1222 /*
1223  * NOTE: Must be called with tty_token held.
1224  */
1225 static void
1226 ucom_cleanup(struct ucom_softc *sc)
1227 {
1228         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1229         DPRINTF(("ucom_cleanup: closing pipes\n"));
1230
1231         ucom_shutdown(sc);
1232         if (sc->sc_bulkin_pipe != NULL) {
1233                 usbd_abort_pipe(sc->sc_bulkin_pipe);
1234                 usbd_close_pipe(sc->sc_bulkin_pipe);
1235                 sc->sc_bulkin_pipe = NULL;
1236         }
1237         if (sc->sc_bulkout_pipe != NULL) {
1238                 usbd_abort_pipe(sc->sc_bulkout_pipe);
1239                 usbd_close_pipe(sc->sc_bulkout_pipe);
1240                 sc->sc_bulkout_pipe = NULL;
1241         }
1242         if (sc->sc_ixfer != NULL) {
1243                 usbd_free_xfer(sc->sc_ixfer);
1244                 sc->sc_ixfer = NULL;
1245         }
1246         if (sc->sc_oxfer != NULL) {
1247                 usbd_free_xfer(sc->sc_oxfer);
1248                 sc->sc_oxfer = NULL;
1249         }
1250 }
1251
1252 /*
1253  * NOTE: Must be called with tty_token held.
1254  */
1255 static void
1256 ucomstopread(struct ucom_softc *sc)
1257 {
1258         usbd_status err;
1259
1260         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1261         DPRINTF(("ucomstopread: enter\n"));
1262
1263         if (!(sc->sc_state & UCS_RXSTOP)) {
1264                 sc->sc_state |= UCS_RXSTOP;
1265                 if (sc->sc_bulkin_pipe == NULL) {
1266                         DPRINTF(("ucomstopread: bulkin pipe NULL\n"));
1267                         return;
1268                 }
1269                 err = usbd_abort_pipe(sc->sc_bulkin_pipe);
1270                 if (err) {
1271                         DPRINTF(("ucomstopread: err = %s\n",
1272                                  usbd_errstr(err)));
1273                 }
1274         }
1275
1276         DPRINTF(("ucomstopread: leave\n"));
1277 }
1278
1279 /*
1280  * NOTE: Must be called with tty_token held.
1281  */
1282 static void
1283 disc_optim(struct tty *tp, struct termios *t, struct ucom_softc *sc)
1284 {
1285         ASSERT_LWKT_TOKEN_HELD(&tty_token);
1286         if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
1287             && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
1288             && (!(t->c_iflag & PARMRK)
1289                 || (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
1290             && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
1291             && linesw[tp->t_line].l_rint == ttyinput) {
1292                 DPRINTF(("disc_optim: bypass l_rint\n"));
1293                 tp->t_state |= TS_CAN_BYPASS_L_RINT;
1294         } else {
1295                 DPRINTF(("disc_optim: can't bypass l_rint\n"));
1296                 tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
1297         }
1298         sc->hotchar = linesw[tp->t_line].l_hotchar;
1299 }