Add a USB comm driver.

Ported from NetBSD by:	akiyama

1 files changed, 1130 insertions, 0 deletions

diff --git a/sys/dev/usb/ucom.c b/sys/dev/usb/ucom.c
new file mode 100644
index 0000000..b4d197e
--- /dev/null
+++ b/sys/dev/usb/ucom.c
@@ -0,0 +1,1130 @@
+/*	$NetBSD: ucom.c,v 1.39 2001/08/16 22:31:24 augustss Exp $	*/
+/*	$FreeBSD$	*/
+
+/*-
+ * Copyright (c) 2001-2002, Shunsuke Akiyama <akiyama@jp.FreeBSD.org>.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Copyright (c) 1998, 2000 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Lennart Augustsson (lennart@augustsson.net) at
+ * Carlstedt Research & Technology.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *        This product includes software developed by the NetBSD
+ *        Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * TODO:
+ * 1. How do I handle hotchar?
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/bus.h>
+#include <sys/ioccom.h>
+#include <sys/fcntl.h>
+#include <sys/conf.h>
+#include <sys/tty.h>
+#include <sys/clist.h>
+#include <sys/file.h>
+#if __FreeBSD_version >= 500014
+#include <sys/selinfo.h>
+#else
+#include <sys/select.h>
+#endif
+#include <sys/proc.h>
+#include <sys/vnode.h>
+#include <sys/poll.h>
+
+#include <dev/usb/usb.h>
+#include <dev/usb/usbcdc.h>
+
+#include <dev/usb/usbdi.h>
+#include <dev/usb/usbdi_util.h>
+#include <dev/usb/usbdevs.h>
+#include <dev/usb/usb_quirks.h>
+
+#include <dev/usb/ucomvar.h>
+
+#ifdef UCOM_DEBUG
+#include <sys/sysctl.h>
+
+static int	ucomdebug = 1;
+
+SYSCTL_NODE(_debug, OID_AUTO, usb, CTLFLAG_RW, 0, "USB debugging");
+SYSCTL_INT(_debug_usb, OID_AUTO, ucom, CTLFLAG_RW,
+	   &ucomdebug, 0, "ucom debug level");
+
+#define DPRINTF(x)	do { \
+				if (ucomdebug) \
+					logprintf x; \
+			} while (0)
+
+#define DPRINTFN(n, x)	do { \
+				if (ucomdebug > (n)) \
+					logprintf x; \
+			} while (0)
+#else
+#define DPRINTF(x)
+#define DPRINTFN(n, x)
+#endif
+
+Static d_open_t  ucomopen;
+Static d_close_t ucomclose;
+Static d_read_t  ucomread;
+Static d_write_t ucomwrite;
+Static d_ioctl_t ucomioctl;
+
+#define UCOM_CDEV_MAJOR  138
+
+static struct cdevsw ucom_cdevsw = {
+	/* open */      ucomopen,
+	/* close */     ucomclose,
+	/* read */      ucomread,
+	/* write */     ucomwrite,
+	/* ioctl */     ucomioctl,
+	/* poll */      ttypoll,
+	/* mmap */      nommap,
+	/* strategy */  nostrategy,
+	/* name */      "usio",
+	/* maj */       UCOM_CDEV_MAJOR,
+	/* dump */      nodump,
+	/* psize */     nopsize,
+	/* flags */     D_TTY | D_KQFILTER,
+	/* kqfilter */	ttykqfilter,
+};
+
+Static void ucom_cleanup(struct ucom_softc *);
+Static int ucomctl(struct ucom_softc *, int, int);
+Static int ucomparam(struct tty *, struct termios *);
+Static void ucomstart(struct tty *);
+Static void ucomstop(struct tty *, int);
+Static void ucom_shutdown(struct ucom_softc *);
+Static void ucom_dtr(struct ucom_softc *, int);
+Static void ucom_rts(struct ucom_softc *, int);
+Static void ucom_break(struct ucom_softc *, int);
+Static usbd_status ucomstartread(struct ucom_softc *);
+Static void ucomreadcb(usbd_xfer_handle, usbd_private_handle, usbd_status);
+Static void ucomwritecb(usbd_xfer_handle, usbd_private_handle, usbd_status);
+Static void ucomstopread(struct ucom_softc *);
+static void disc_optim(struct tty *, struct termios *, struct ucom_softc *);
+
+devclass_t ucom_devclass;
+
+static moduledata_t ucom_mod = {
+	"ucom",
+	NULL,
+	NULL
+};
+
+DECLARE_MODULE(ucom, ucom_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
+MODULE_VERSION(ucom, UCOM_MODVER);
+
+int
+ucom_attach(struct ucom_softc *sc)
+{
+	struct tty *tp;
+	int unit;
+
+	unit = device_get_unit(sc->sc_dev);
+
+	sc->sc_tty = tp = ttymalloc(sc->sc_tty);
+	tp->t_oproc = ucomstart;
+	tp->t_param = ucomparam;
+	tp->t_stop = ucomstop;
+
+	DPRINTF(("ucom_attach: tty_attach tp = %p\n", tp));
+
+	DPRINTF(("ucom_attach: make_dev: usio%d\n", unit));
+
+	sc->dev = make_dev(&ucom_cdevsw, unit | UCOM_CALLOUT_MASK,
+			UID_UUCP, GID_DIALER, 0660,
+			"usio%d", unit);
+	sc->dev->si_tty = tp;
+
+	return (0);
+}
+
+int
+ucom_detach(struct ucom_softc *sc)
+{
+	DPRINTF(("ucom_detach: sc = %p, tp = %p\n", sc, sc->sc_tty));
+
+	sc->sc_dying = 1;
+
+	if (sc->sc_bulkin_pipe != NULL)
+		usbd_abort_pipe(sc->sc_bulkin_pipe);
+	if (sc->sc_bulkout_pipe != NULL)
+		usbd_abort_pipe(sc->sc_bulkout_pipe);
+
+	if (sc->sc_tty == NULL) {
+		DPRINTF(("ucom_detach: no tty\n"));
+		return (0);
+	}
+
+	destroy_dev(sc->dev);
+
+	return (0);
+}
+
+Static void
+ucom_shutdown(struct ucom_softc *sc)
+{
+	struct tty *tp = sc->sc_tty;
+
+	DPRINTF(("ucom_shutdown\n"));
+	/*
+	 * Hang up if necessary.  Wait a bit, so the other side has time to
+	 * notice even if we immediately open the port again.
+	 */
+	if (ISSET(tp->t_cflag, HUPCL)) {
+		(void)ucomctl(sc, TIOCM_DTR, DMBIC);
+		(void)tsleep(sc, TTIPRI, "ucomsd", hz);
+	}
+}
+
+Static int
+ucomopen(dev_t dev, int flag, int mode, usb_proc_ptr p)
+{
+	int unit = UCOMUNIT(dev);
+	struct ucom_softc *sc;
+	usbd_status err;
+	struct tty *tp;
+	int s;
+	int error;
+
+	USB_GET_SC_OPEN(ucom, unit, sc);
+
+	if (sc->sc_dying)
+		return (EIO);
+
+	tp = sc->sc_tty;
+
+	DPRINTF(("%s: ucomopen: tp = %p\n", USBDEVNAME(sc->sc_dev), tp));
+
+	if (ISSET(tp->t_state, TS_ISOPEN) &&
+	    ISSET(tp->t_state, TS_XCLUDE) &&
+	    suser_td(p))
+		return (EBUSY);
+
+	/*
+	 * Do the following iff this is a first open.
+	 */
+	s = spltty();
+	while (sc->sc_opening)
+		tsleep(&sc->sc_opening, PRIBIO, "ucomop", 0);
+	sc->sc_opening = 1;
+
+	if (!ISSET(tp->t_state, TS_ISOPEN)) {
+		struct termios t;
+
+		sc->sc_poll = 0;
+		sc->sc_lsr = sc->sc_msr = sc->sc_mcr = 0;
+
+		tp->t_dev = dev;
+
+		/*
+		 * Initialize the termios status to the defaults.  Add in the
+		 * sticky bits from TIOCSFLAGS.
+		 */
+		t.c_ispeed = 0;
+		t.c_ospeed = TTYDEF_SPEED;
+		t.c_cflag = TTYDEF_CFLAG;
+		/* Make sure ucomparam() will do something. */
+		tp->t_ospeed = 0;
+		(void)ucomparam(tp, &t);
+		tp->t_iflag = TTYDEF_IFLAG;
+		tp->t_oflag = TTYDEF_OFLAG;
+		tp->t_lflag = TTYDEF_LFLAG;
+		ttychars(tp);
+		ttsetwater(tp);
+
+		/*
+		 * Turn on DTR.  We must always do this, even if carrier is not
+		 * present, because otherwise we'd have to use TIOCSDTR
+		 * immediately after setting CLOCAL, which applications do not
+		 * expect.  We always assert DTR while the device is open
+		 * unless explicitly requested to deassert it.
+		 */
+		(void)ucomctl(sc, TIOCM_DTR | TIOCM_RTS, DMBIS);
+
+		/* Device specific open */
+		if (sc->sc_callback->ucom_open != NULL) {
+			error = sc->sc_callback->ucom_open(sc->sc_parent,
+							   sc->sc_portno);
+			if (error) {
+				ucom_cleanup(sc);
+				sc->sc_opening = 0;
+				wakeup(&sc->sc_opening);
+				splx(s);
+				return (error);
+			}
+		}
+
+		DPRINTF(("ucomopen: open pipes in = %d out = %d\n",
+			 sc->sc_bulkin_no, sc->sc_bulkout_no));
+
+		/* Open the bulk pipes */
+		/* Bulk-in pipe */
+		err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkin_no, 0,
+				     &sc->sc_bulkin_pipe);
+		if (err) {
+			printf("%s: open bulk out error (addr %d): %s\n",
+			       USBDEVNAME(sc->sc_dev), sc->sc_bulkin_no, 
+			       usbd_errstr(err));
+			error = EIO;
+			goto fail_0;
+		}
+		/* Bulk-out pipe */
+		err = usbd_open_pipe(sc->sc_iface, sc->sc_bulkout_no,
+				     USBD_EXCLUSIVE_USE, &sc->sc_bulkout_pipe);
+		if (err) {
+			printf("%s: open bulk in error (addr %d): %s\n",
+			       USBDEVNAME(sc->sc_dev), sc->sc_bulkout_no,
+			       usbd_errstr(err));
+			error = EIO;
+			goto fail_1;
+		}
+
+		/* Allocate a request and an input buffer and start reading. */
+		sc->sc_ixfer = usbd_alloc_xfer(sc->sc_udev);
+		if (sc->sc_ixfer == NULL) {
+			error = ENOMEM;
+			goto fail_2;
+		}
+
+		sc->sc_ibuf = usbd_alloc_buffer(sc->sc_ixfer,
+						sc->sc_ibufsizepad);
+		if (sc->sc_ibuf == NULL) {
+			error = ENOMEM;
+			goto fail_3;
+		}
+
+		sc->sc_oxfer = usbd_alloc_xfer(sc->sc_udev);
+		if (sc->sc_oxfer == NULL) {
+			error = ENOMEM;
+			goto fail_3;
+		}
+
+		sc->sc_obuf = usbd_alloc_buffer(sc->sc_oxfer,
+						sc->sc_obufsize +
+						sc->sc_opkthdrlen);
+		if (sc->sc_obuf == NULL) {
+			error = ENOMEM;
+			goto fail_4;
+		}
+
+		/*
+		 * Handle initial DCD.
+		 */
+		if (ISSET(sc->sc_msr, UMSR_DCD)
+		    || (minor(dev) & UCOM_CALLOUT_MASK))
+			(*linesw[tp->t_line].l_modem)(tp, 1);
+
+		ucomstartread(sc);
+	}
+
+	sc->sc_opening = 0;
+	wakeup(&sc->sc_opening);
+	splx(s);
+
+	error = ttyopen(dev, tp);
+	if (error)
+		goto bad;
+
+	error = (*linesw[tp->t_line].l_open)(dev, tp);
+	if (error)
+		goto bad;
+
+	disc_optim(tp, &tp->t_termios, sc);
+
+	DPRINTF(("%s: ucomopen: success\n", USBDEVNAME(sc->sc_dev)));
+
+	sc->sc_poll = 1;
+
+	return (0);
+
+fail_4:
+	usbd_free_xfer(sc->sc_oxfer);
+	sc->sc_oxfer = NULL;
+fail_3:
+	usbd_free_xfer(sc->sc_ixfer);
+	sc->sc_ixfer = NULL;
+fail_2:
+	usbd_close_pipe(sc->sc_bulkout_pipe);
+	sc->sc_bulkout_pipe = NULL;
+fail_1:
+	usbd_close_pipe(sc->sc_bulkin_pipe);
+	sc->sc_bulkin_pipe = NULL;
+fail_0:
+	sc->sc_opening = 0;
+	wakeup(&sc->sc_opening);
+	splx(s);
+	return (error);
+
+bad:
+	if (!ISSET(tp->t_state, TS_ISOPEN)) {
+		/*
+		 * We failed to open the device, and nobody else had it opened.
+		 * Clean up the state as appropriate.
+		 */
+		ucom_cleanup(sc);
+	}
+
+	DPRINTF(("%s: ucomopen: failed\n", USBDEVNAME(sc->sc_dev)));
+
+	return (error);
+}
+
+static int
+ucomclose(dev_t dev, int flag, int mode, usb_proc_ptr p)
+{
+	struct ucom_softc *sc;
+	struct tty *tp;
+	int s;
+
+	USB_GET_SC(ucom, UCOMUNIT(dev), sc);
+
+	tp = sc->sc_tty;
+
+	DPRINTF(("%s: ucomclose: unit = %d\n",
+		USBDEVNAME(sc->sc_dev), UCOMUNIT(dev)));
+
+	if (!ISSET(tp->t_state, TS_ISOPEN))
+		return (0);
+
+	s = spltty();
+	(*linesw[tp->t_line].l_close)(tp, flag);
+	disc_optim(tp, &tp->t_termios, sc);
+	ttyclose(tp);
+	splx(s);
+
+	if (sc->sc_dying)
+		return (0);
+
+	if (!ISSET(tp->t_state, TS_ISOPEN)) {
+		/*
+		 * Although we got a last close, the device may still be in
+		 * use; e.g. if this was the dialout node, and there are still
+		 * processes waiting for carrier on the non-dialout node.
+		 */
+		ucom_cleanup(sc);
+	}
+
+	if (sc->sc_callback->ucom_close != NULL)
+		sc->sc_callback->ucom_close(sc->sc_parent, sc->sc_portno);
+
+	return (0);
+}
+
+static int
+ucomread(dev_t dev, struct uio *uio, int flag)
+{
+	struct ucom_softc *sc;
+	struct tty *tp;
+	int error;
+
+	USB_GET_SC(ucom, UCOMUNIT(dev), sc);
+	tp = sc->sc_tty;
+
+	DPRINTF(("ucomread: tp = %p, flag = 0x%x\n", tp, flag));
+
+	if (sc->sc_dying)
+		return (EIO);
+
+	error = (*linesw[tp->t_line].l_read)(tp, uio, flag);
+
+	DPRINTF(("ucomread: error = %d\n", error));
+
+	return (error);
+}
+
+static int
+ucomwrite(dev_t dev, struct uio *uio, int flag)
+{
+	struct ucom_softc *sc;
+	struct tty *tp;
+	int error;
+
+	USB_GET_SC(ucom, UCOMUNIT(dev), sc);
+	tp = sc->sc_tty;
+
+	DPRINTF(("ucomwrite: tp = %p, flag = 0x%x\n", tp, flag));
+
+	if (sc->sc_dying)
+		return (EIO);
+
+	error = (*linesw[tp->t_line].l_write)(tp, uio, flag);
+
+	DPRINTF(("ucomwrite: error = %d\n", error));
+
+	return (error);
+}
+
+static int
+ucomioctl(dev_t dev, u_long cmd, caddr_t data, int flag, usb_proc_ptr p)
+{
+	struct ucom_softc *sc;
+	struct tty *tp;
+	int error;
+	int s;
+	int d;
+
+	USB_GET_SC(ucom, UCOMUNIT(dev), sc);
+	tp = sc->sc_tty;
+
+	if (sc->sc_dying)
+		return (EIO);
+
+	DPRINTF(("ucomioctl: cmd = 0x%08lx\n", cmd));
+
+	error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p);
+	if (error >= 0) {
+		DPRINTF(("ucomioctl: l_ioctl: error = %d\n", error));
+		return (error);
+	}
+
+	error = ttioctl(tp, cmd, data, flag);
+	disc_optim(tp, &tp->t_termios, sc);
+	if (error >= 0) {
+		DPRINTF(("ucomioctl: ttioctl: error = %d\n", error));
+		return (error);
+	}
+
+	if (sc->sc_callback->ucom_ioctl != NULL) {
+		error = sc->sc_callback->ucom_ioctl(sc->sc_parent,
+						    sc->sc_portno,
+						    cmd, data, flag, p);
+		if (error >= 0)
+			return (error);
+	}
+
+	error = 0;
+
+	DPRINTF(("ucomioctl: our cmd = 0x%08lx\n", cmd));
+
+	s = spltty();
+
+	switch (cmd) {
+	case TIOCSBRK:
+		DPRINTF(("ucomioctl: TIOCSBRK\n"));
+		ucom_break(sc, 1);
+		break;
+	case TIOCCBRK:
+		DPRINTF(("ucomioctl: TIOCCBRK\n"));
+		ucom_break(sc, 0);
+		break;
+
+	case TIOCSDTR:
+		DPRINTF(("ucomioctl: TIOCSDTR\n"));
+		(void)ucomctl(sc, TIOCM_DTR, DMBIS);
+		break;
+	case TIOCCDTR:
+		DPRINTF(("ucomioctl: TIOCCDTR\n"));
+		(void)ucomctl(sc, TIOCM_DTR, DMBIC);
+		break;
+
+	case TIOCMSET:
+		d = *(int *)data;
+		DPRINTF(("ucomioctl: TIOCMSET, 0x%x\n", d));
+		(void)ucomctl(sc, d, DMSET);
+		break;
+	case TIOCMBIS:
+		d = *(int *)data;
+		DPRINTF(("ucomioctl: TIOCMBIS, 0x%x\n", d));
+		(void)ucomctl(sc, d, DMBIS);
+		break;
+	case TIOCMBIC:
+		d = *(int *)data;
+		DPRINTF(("ucomioctl: TIOCMBIC, 0x%x\n", d));
+		(void)ucomctl(sc, d, DMBIC);
+		break;
+	case TIOCMGET:
+		d = ucomctl(sc, 0, DMGET);
+		DPRINTF(("ucomioctl: TIOCMGET, 0x%x\n", d));
+		*(int *)data = d;
+		break;
+
+	default:
+		DPRINTF(("ucomioctl: error: our cmd = 0x%08lx\n", cmd));
+		error = ENOTTY;
+		break;
+	}
+
+	splx(s);
+
+	return (error);
+}
+
+Static int
+ucomctl(struct ucom_softc *sc, int bits, int how)
+{
+	int	mcr;
+	int	msr;
+	int	onoff;
+
+	DPRINTF(("ucomctl: bits = 0x%x, how = %d\n", bits, how));
+
+	if (how == DMGET) {
+		SET(bits, TIOCM_LE);		/* always set TIOCM_LE bit */
+		DPRINTF(("ucomctl: DMGET: LE"));
+
+		mcr = sc->sc_mcr;
+		if (ISSET(mcr, UMCR_DTR)) {
+			SET(bits, TIOCM_DTR);
+			DPRINTF((" DTR"));
+		}
+		if (ISSET(mcr, UMCR_RTS)) {
+			SET(bits, TIOCM_RTS);
+			DPRINTF((" RTS"));
+		}
+
+		msr = sc->sc_msr;
+		if (ISSET(msr, UMSR_CTS)) {
+			SET(bits, TIOCM_CTS);
+			DPRINTF((" CTS"));
+		}
+		if (ISSET(msr, UMSR_DCD)) {
+			SET(bits, TIOCM_CD);
+			DPRINTF((" CD"));
+		}
+		if (ISSET(msr, UMSR_DSR)) {
+			SET(bits, TIOCM_DSR);
+			DPRINTF((" DSR"));
+		}
+		if (ISSET(msr, UMSR_RI)) {
+			SET(bits, TIOCM_RI);
+			DPRINTF((" RI"));
+		}
+
+		DPRINTF(("\n"));
+
+		return (bits);
+	}
+
+	mcr = 0;
+	if (ISSET(bits, TIOCM_DTR))
+		SET(mcr, UMCR_DTR);
+	if (ISSET(bits, TIOCM_RTS))
+		SET(mcr, UMCR_RTS);
+
+	switch (how) {
+	case DMSET:
+		sc->sc_mcr = mcr;
+		break;
+	case DMBIS:
+		sc->sc_mcr |= mcr;
+		break;
+	case DMBIC:
+		sc->sc_mcr &= ~mcr;
+		break;
+	}
+
+	onoff = ISSET(sc->sc_mcr, UMCR_DTR) ? 1 : 0;
+	ucom_dtr(sc, onoff);
+
+	onoff = ISSET(sc->sc_mcr, UMCR_RTS) ? 1 : 0;
+	ucom_rts(sc, onoff);
+
+	return (0);
+}
+
+Static void
+ucom_break(struct ucom_softc *sc, int onoff)
+{
+	DPRINTF(("ucom_break: onoff = %d\n", onoff));
+
+	if (sc->sc_callback->ucom_set == NULL)
+		return;
+	sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno,
+				  UCOM_SET_BREAK, onoff);
+}
+
+Static void
+ucom_dtr(struct ucom_softc *sc, int onoff)
+{
+	DPRINTF(("ucom_dtr: onoff = %d\n", onoff));
+
+	if (sc->sc_callback->ucom_set == NULL)
+		return;
+	sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno, 
+				  UCOM_SET_DTR, onoff);
+}
+
+Static void
+ucom_rts(struct ucom_softc *sc, int onoff)
+{
+	DPRINTF(("ucom_rts: onoff = %d\n", onoff));
+
+	if (sc->sc_callback->ucom_set == NULL)
+		return;
+	sc->sc_callback->ucom_set(sc->sc_parent, sc->sc_portno, 
+				  UCOM_SET_RTS, onoff);
+}
+
+void
+ucom_status_change(struct ucom_softc *sc)
+{
+	struct tty *tp = sc->sc_tty;
+	u_char old_msr;
+	int onoff;
+
+	if (sc->sc_callback->ucom_get_status == NULL) {
+		sc->sc_lsr = 0;
+		sc->sc_msr = 0;
+		return;
+	}
+
+	old_msr = sc->sc_msr;
+	sc->sc_callback->ucom_get_status(sc->sc_parent, sc->sc_portno,
+					 &sc->sc_lsr, &sc->sc_msr);
+	if (ISSET((sc->sc_msr ^ old_msr), UMSR_DCD)) {
+		if (sc->sc_poll == 0)
+			return;
+		onoff = ISSET(sc->sc_msr, UMSR_DCD) ? 1 : 0;
+		DPRINTF(("ucom_status_change: DCD changed to %d\n", onoff));
+		(*linesw[tp->t_line].l_modem)(tp, onoff);
+	}
+}
+
+Static int
+ucomparam(struct tty *tp, struct termios *t)
+{
+	struct ucom_softc *sc;
+	int error;
+	usbd_status uerr;
+
+	USB_GET_SC(ucom, UCOMUNIT(tp->t_dev), sc);
+
+	if (sc->sc_dying)
+		return (EIO);
+
+	DPRINTF(("ucomparam: sc = %p\n", sc));
+
+	/* Check requested parameters. */
+	if (t->c_ospeed < 0) {
+		DPRINTF(("ucomparam: negative ospeed\n"));
+		return (EINVAL);
+	}
+	if (t->c_ispeed && t->c_ispeed != t->c_ospeed) {
+		DPRINTF(("ucomparam: mismatch ispeed and ospeed\n"));
+		return (EINVAL);
+	}
+
+	/*
+	 * If there were no changes, don't do anything.  This avoids dropping
+	 * input and improves performance when all we did was frob things like
+	 * VMIN and VTIME.
+	 */
+	if (tp->t_ospeed == t->c_ospeed &&
+	    tp->t_cflag == t->c_cflag)
+		return (0);
+
+	/* And copy to tty. */
+	tp->t_ispeed = 0;
+	tp->t_ospeed = t->c_ospeed;
+	tp->t_cflag = t->c_cflag;
+
+	if (sc->sc_callback->ucom_param == NULL)
+		return (0);
+
+	ucomstopread(sc);
+
+	error = sc->sc_callback->ucom_param(sc->sc_parent, sc->sc_portno, t);
+	if (error) {
+		DPRINTF(("ucomparam: callback: error = %d\n", error));
+		return (error);
+	}
+
+	ttsetwater(tp);
+
+	if (t->c_cflag & CRTS_IFLOW) {
+		sc->sc_state |= UCS_RTS_IFLOW;
+	} else if (sc->sc_state & UCS_RTS_IFLOW) {
+		sc->sc_state &= ~UCS_RTS_IFLOW;
+		(void)ucomctl(sc, UMCR_RTS, DMBIS);
+	}
+
+	disc_optim(tp, t, sc);
+
+	uerr = ucomstartread(sc);
+	if (uerr != USBD_NORMAL_COMPLETION)
+		return (EIO);
+
+	return (0);
+}
+
+Static void
+ucomstart(struct tty *tp)
+{
+	struct ucom_softc *sc;
+	struct cblock *cbp;
+	usbd_status err;
+	int s;
+	u_char *data;
+	int cnt;
+
+	USB_GET_SC(ucom, UCOMUNIT(tp->t_dev), sc);
+	DPRINTF(("ucomstart: sc = %p\n", sc));
+
+	if (sc->sc_dying)
+		return;
+
+	s = spltty();
+
+	if (tp->t_state & TS_TBLOCK) {
+		if (ISSET(sc->sc_mcr, UMCR_RTS) &&
+		    ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
+			DPRINTF(("ucomstart: clear RTS\n"));
+			(void)ucomctl(sc, UMCR_RTS, DMBIC);
+		}
+	} else {
+		if (!ISSET(sc->sc_mcr, UMCR_RTS) &&
+		    tp->t_rawq.c_cc <= tp->t_ilowat &&
+		    ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
+			DPRINTF(("ucomstart: set RTS\n"));
+			(void)ucomctl(sc, UMCR_RTS, DMBIS);
+		}
+	}
+
+	if (ISSET(tp->t_state, TS_BUSY | TS_TIMEOUT | TS_TTSTOP)) {
+		ttwwakeup(tp);
+		DPRINTF(("ucomstart: stopped\n"));
+		goto out;
+	}
+
+	if (tp->t_outq.c_cc <= tp->t_olowat) {
+		if (ISSET(tp->t_state, TS_SO_OLOWAT)) {
+			CLR(tp->t_state, TS_SO_OLOWAT);
+			wakeup(TSA_OLOWAT(tp));
+		}
+		selwakeup(&tp->t_wsel);
+		if (tp->t_outq.c_cc == 0) {
+			if (ISSET(tp->t_state, TS_BUSY | TS_SO_OCOMPLETE) ==
+			    TS_SO_OCOMPLETE && tp->t_outq.c_cc == 0) {
+				CLR(tp->t_state, TS_SO_OCOMPLETE);
+				wakeup(TSA_OCOMPLETE(tp));
+			}
+			goto out;
+		}
+	}
+
+	/* Grab the first contiguous region of buffer space. */
+	data = tp->t_outq.c_cf;
+	cbp = (struct cblock *) ((intptr_t) tp->t_outq.c_cf & ~CROUND);
+	cnt = min((char *) (cbp+1) - tp->t_outq.c_cf, tp->t_outq.c_cc);
+
+	if (cnt == 0) {
+		DPRINTF(("ucomstart: cnt == 0\n"));
+		goto out;
+	}
+
+	SET(tp->t_state, TS_BUSY);
+
+	if (cnt > sc->sc_obufsize) {
+		DPRINTF(("ucomstart: big buffer %d chars\n", cnt));
+		cnt = sc->sc_obufsize;
+	}
+	if (sc->sc_callback->ucom_write != NULL)
+		sc->sc_callback->ucom_write(sc->sc_parent, sc->sc_portno,
+					    sc->sc_obuf, data, &cnt);
+	else
+		memcpy(sc->sc_obuf, data, cnt);
+
+	DPRINTF(("ucomstart: %d chars\n", cnt));
+	usbd_setup_xfer(sc->sc_oxfer, sc->sc_bulkout_pipe, 
+			(usbd_private_handle)sc, sc->sc_obuf, cnt,
+			USBD_NO_COPY, USBD_NO_TIMEOUT, ucomwritecb);
+	/* What can we do on error? */
+	err = usbd_transfer(sc->sc_oxfer);
+	if (err != USBD_IN_PROGRESS)
+		printf("ucomstart: err=%s\n", usbd_errstr(err));
+
+	ttwwakeup(tp);
+
+    out:
+	splx(s);
+}
+
+Static void
+ucomstop(struct tty *tp, int flag)
+{
+	struct ucom_softc *sc;
+	int s;
+
+	USB_GET_SC(ucom, UCOMUNIT(tp->t_dev), sc);
+
+	DPRINTF(("ucomstop: %d\n", flag));
+
+	if (flag & FREAD) {
+		DPRINTF(("ucomstop: read\n"));
+		ucomstopread(sc);
+	}
+
+	if (flag & FWRITE) {
+		DPRINTF(("ucomstop: write\n"));
+		s = spltty();
+		if (ISSET(tp->t_state, TS_BUSY)) {
+			/* XXX do what? */
+			if (!ISSET(tp->t_state, TS_TTSTOP))
+				SET(tp->t_state, TS_FLUSH);
+		}
+		splx(s);
+	}
+}
+
+Static void
+ucomwritecb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
+{
+	struct ucom_softc *sc = (struct ucom_softc *)p;
+	struct tty *tp = sc->sc_tty;
+	u_int32_t cc;
+	int s;
+
+	DPRINTF(("ucomwritecb: status = %d\n", status));
+
+	if (status == USBD_CANCELLED || sc->sc_dying)
+		goto error;
+
+	if (status != USBD_NORMAL_COMPLETION) {
+		printf("%s: ucomwritecb: %s\n",
+		       USBDEVNAME(sc->sc_dev), usbd_errstr(status));
+		if (status == USBD_STALLED)
+			usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
+		/* XXX we should restart after some delay. */
+		goto error;
+	}
+
+	usbd_get_xfer_status(xfer, NULL, NULL, &cc, NULL);
+	DPRINTF(("ucomwritecb: cc = %d\n", cc));
+
+	/* convert from USB bytes to tty bytes */
+	cc -= sc->sc_opkthdrlen;
+
+	s = spltty();
+	CLR(tp->t_state, TS_BUSY);
+	if (ISSET(tp->t_state, TS_FLUSH))
+		CLR(tp->t_state, TS_FLUSH);
+	else
+		ndflush(&tp->t_outq, cc);
+	(*linesw[tp->t_line].l_start)(tp);
+	splx(s);
+
+	return;
+
+  error:
+	s = spltty();
+	CLR(tp->t_state, TS_BUSY);
+	splx(s);
+	return;
+}
+
+Static usbd_status
+ucomstartread(struct ucom_softc *sc)
+{
+	usbd_status err;
+
+	DPRINTF(("ucomstartread: start\n"));
+
+	sc->sc_state &= ~UCS_RXSTOP;
+
+	if (sc->sc_bulkin_pipe == NULL)
+		return (USBD_NORMAL_COMPLETION);
+
+	usbd_setup_xfer(sc->sc_ixfer, sc->sc_bulkin_pipe, 
+			(usbd_private_handle)sc, 
+			sc->sc_ibuf, sc->sc_ibufsize,
+			USBD_SHORT_XFER_OK | USBD_NO_COPY,
+			USBD_NO_TIMEOUT, ucomreadcb);
+
+	err = usbd_transfer(sc->sc_ixfer);
+	if (err != USBD_IN_PROGRESS) {
+		DPRINTF(("ucomstartread: err = %s\n", usbd_errstr(err)));
+		return (err);
+	}
+
+	return (USBD_NORMAL_COMPLETION);
+}
+
+Static void
+ucomreadcb(usbd_xfer_handle xfer, usbd_private_handle p, usbd_status status)
+{
+	struct ucom_softc *sc = (struct ucom_softc *)p;
+	struct tty *tp = sc->sc_tty;
+	int (*rint) (int c, struct tty *tp) = linesw[tp->t_line].l_rint;
+	usbd_status err;
+	u_int32_t cc;
+	u_char *cp;
+	int lostcc;
+	int s;
+
+	DPRINTF(("ucomreadcb: status = %d\n", status));
+
+	if (status != USBD_NORMAL_COMPLETION) {
+		if (!(sc->sc_state & UCS_RXSTOP))
+			printf("%s: ucomreadcb: %s\n",
+			       USBDEVNAME(sc->sc_dev), usbd_errstr(status));
+		if (status == USBD_STALLED)
+			usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
+		/* XXX we should restart after some delay. */
+		return;
+	}
+
+	usbd_get_xfer_status(xfer, NULL, (void **)&cp, &cc, NULL);
+	DPRINTF(("ucomreadcb: got %d chars, tp = %p\n", cc, tp));
+	if (sc->sc_callback->ucom_read != NULL)
+		sc->sc_callback->ucom_read(sc->sc_parent, sc->sc_portno,
+					   &cp, &cc);
+
+	s = spltty();
+	if (tp->t_state & TS_CAN_BYPASS_L_RINT) {
+		if (tp->t_rawq.c_cc + cc > tp->t_ihiwat
+		    && (sc->sc_state & UCS_RTS_IFLOW
+			|| tp->t_iflag & IXOFF)
+		    && !(tp->t_state & TS_TBLOCK))
+			ttyblock(tp);
+		lostcc = b_to_q((char *)cp, cc, &tp->t_rawq);
+		tp->t_rawcc += cc;
+		ttwakeup(tp);
+		if (tp->t_state & TS_TTSTOP
+		    && (tp->t_iflag & IXANY
+			|| tp->t_cc[VSTART] == tp->t_cc[VSTOP])) {
+			tp->t_state &= ~TS_TTSTOP;
+			tp->t_lflag &= ~FLUSHO;
+			ucomstart(tp);
+		}
+		if (lostcc > 0)
+			printf("%s: lost %d chars\n", USBDEVNAME(sc->sc_dev),
+			       lostcc);
+	} else {
+		/* Give characters to tty layer. */
+		while (cc-- > 0) {
+			DPRINTFN(7,("ucomreadcb: char = 0x%02x\n", *cp));
+			if ((*rint)(*cp++, tp) == -1) {
+				/* XXX what should we do? */
+				printf("%s: lost %d chars\n",
+				       USBDEVNAME(sc->sc_dev), cc);
+				break;
+			}
+		}
+	}
+	splx(s);
+
+	err = ucomstartread(sc);
+	if (err) {
+		printf("%s: read start failed\n", USBDEVNAME(sc->sc_dev));
+		/* XXX what should we dow now? */
+	}
+
+	if ((sc->sc_state & UCS_RTS_IFLOW) && !ISSET(sc->sc_mcr, UMCR_RTS)
+	    && !(tp->t_state & TS_TBLOCK))
+		ucomctl(sc, UMCR_RTS, DMBIS);
+}
+
+Static void
+ucom_cleanup(struct ucom_softc *sc)
+{
+	DPRINTF(("ucom_cleanup: closing pipes\n"));
+
+	ucom_shutdown(sc);
+	if (sc->sc_bulkin_pipe != NULL) {
+		usbd_abort_pipe(sc->sc_bulkin_pipe);
+		usbd_close_pipe(sc->sc_bulkin_pipe);
+		sc->sc_bulkin_pipe = NULL;
+	}
+	if (sc->sc_bulkout_pipe != NULL) {
+		usbd_abort_pipe(sc->sc_bulkout_pipe);
+		usbd_close_pipe(sc->sc_bulkout_pipe);
+		sc->sc_bulkout_pipe = NULL;
+	}
+	if (sc->sc_ixfer != NULL) {
+		usbd_free_xfer(sc->sc_ixfer);
+		sc->sc_ixfer = NULL;
+	}
+	if (sc->sc_oxfer != NULL) {
+		usbd_free_xfer(sc->sc_oxfer);
+		sc->sc_oxfer = NULL;
+	}
+}
+
+Static void
+ucomstopread(struct ucom_softc *sc)
+{
+	if (!(sc->sc_state & UCS_RXSTOP)) {
+		if (sc->sc_bulkin_pipe == NULL)
+			return;
+		sc->sc_state |= UCS_RXSTOP;
+		usbd_abort_pipe(sc->sc_bulkin_pipe);
+	}
+}
+
+static void
+disc_optim(struct tty *tp, struct termios *t, struct ucom_softc *sc)
+{
+	if (!(t->c_iflag & (ICRNL | IGNCR | IMAXBEL | INLCR | ISTRIP | IXON))
+	    && (!(t->c_iflag & BRKINT) || (t->c_iflag & IGNBRK))
+	    && (!(t->c_iflag & PARMRK)
+		|| (t->c_iflag & (IGNPAR | IGNBRK)) == (IGNPAR | IGNBRK))
+	    && !(t->c_lflag & (ECHO | ICANON | IEXTEN | ISIG | PENDIN))
+	    && linesw[tp->t_line].l_rint == ttyinput) {
+		DPRINTF(("disc_optim: bypass l_rint\n"));
+		tp->t_state |= TS_CAN_BYPASS_L_RINT;
+	} else {
+		DPRINTF(("disc_optim: can't bypass l_rint\n"));
+		tp->t_state &= ~TS_CAN_BYPASS_L_RINT;
+	}
+	sc->hotchar = linesw[tp->t_line].l_hotchar;
+}