freebsd-skq/sys/dev/usb/ucom.c
Warner Losh 5acfdb129b Starting in version 1.56, ucomstop started calling ucomstart to work
around an output freezing problem (see the CVS log for details).  This
is the same approach that sio takes to solve that problem.  However,
ucom has a problem that sio doesn't have.

Consider the case where output is pending, and the device is closed.
ttyclose calls tt_close (which indirects to ucomclose) and then calls
ttyflush which calls tt_stop (which indirects to ucomstop).  Since
ucomclose removed all the usb transfer points, sc_oxfer will be NULL
when ucomstop calls ucomstart.  This results in a null pointer
dereference.

Since calling ucomstart in ucomstart solves other problems, we need to
work with this calling sequence.  The easiest way to do that is to
bail early if sc_oxfer is NULL.

Kazuaki ODA-san came up with this patch, and filed a PR.  I had seen
this bug at work and this patch does seem to solve it.  He had no idea
why it worked, but knew that either this patch, or backing out ucom.c
1.56 fixed his panic.  I just did the legwork of chasing down the code
paths that would cause this, and added a comment.  This is obscure
enough to warrant a comment, I think.

Submitted by: Kazuaki ODA-san
PR: 113964
Approved by: re (bmah)
2007-06-25 06:40:20 +00:00

870 lines
21 KiB
C

/* $NetBSD: ucom.c,v 1.40 2001/11/13 06:24:54 lukem Exp $ */
/*-
* Copyright (c) 2001-2003, 2005 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*-
* 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.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/ioccom.h>
#include <sys/fcntl.h>
#include <sys/conf.h>
#include <sys/serial.h>
#include <sys/tty.h>
#include <sys/clist.h>
#include <sys/file.h>
#include <sys/selinfo.h>
#include <sys/proc.h>
#include <sys/poll.h>
#include <sys/sysctl.h>
#include <dev/usb/usb.h>
#include <dev/usb/usbcdc.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include "usbdevs.h"
#include <dev/usb/usb_quirks.h>
#include <dev/usb/ucomvar.h>
#ifdef USB_DEBUG
static int ucomdebug = 0;
SYSCTL_NODE(_hw_usb, OID_AUTO, ucom, CTLFLAG_RW, 0, "USB ucom");
SYSCTL_INT(_hw_usb_ucom, OID_AUTO, debug, CTLFLAG_RW,
&ucomdebug, 0, "ucom debug level");
#define DPRINTF(x) do { \
if (ucomdebug) \
printf x; \
} while (0)
#define DPRINTFN(n, x) do { \
if (ucomdebug > (n)) \
printf x; \
} while (0)
#else
#define DPRINTF(x)
#define DPRINTFN(n, x)
#endif
static void ucom_cleanup(struct ucom_softc *);
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 ucombreak(struct tty *, 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 t_open_t ucomopen;
static t_close_t ucomclose;
static t_modem_t ucommodem;
static t_ioctl_t ucomioctl;
devclass_t ucom_devclass;
static moduledata_t ucom_mod = {
"ucom",
NULL,
NULL
};
DECLARE_MODULE(ucom, ucom_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
MODULE_DEPEND(ucom, usb, 1, 1, 1);
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 = ttyalloc();
tp->t_sc = sc;
tp->t_oproc = ucomstart;
tp->t_param = ucomparam;
tp->t_stop = ucomstop;
tp->t_break = ucombreak;
tp->t_open = ucomopen;
tp->t_close = ucomclose;
tp->t_modem = ucommodem;
tp->t_ioctl = ucomioctl;
DPRINTF(("ucom_attach: tty_attach tp = %p\n", tp));
ttycreate(tp, TS_CALLOUT, "U%d", unit);
DPRINTF(("ucom_attach: ttycreate: ttyU%d\n", unit));
return (0);
}
int
ucom_detach(struct ucom_softc *sc)
{
int s;
DPRINTF(("ucom_detach: sc = %p, tp = %p\n", sc, sc->sc_tty));
sc->sc_dying = 1;
ttygone(sc->sc_tty);
if (sc->sc_tty->t_state & TS_ISOPEN)
ucomclose(sc->sc_tty);
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);
ttyfree(sc->sc_tty);
s = splusb();
splx(s);
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)ucommodem(tp, 0, SER_DTR);
(void)tsleep(sc, TTIPRI, "ucomsd", hz);
}
}
static int
ucomopen(struct tty *tp, struct cdev *dev)
{
struct ucom_softc *sc;
usbd_status err;
int error;
sc = tp->t_sc;
if (sc->sc_dying)
return (ENXIO);
DPRINTF(("%s: ucomopen: tp = %p\n", device_get_nameunit(sc->sc_dev), tp));
sc->sc_poll = 0;
sc->sc_lsr = sc->sc_msr = sc->sc_mcr = 0;
(void)ucommodem(tp, SER_DTR | SER_RTS, 0);
/* 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);
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 in error (addr %d): %s\n",
device_get_nameunit(sc->sc_dev), sc->sc_bulkin_no,
usbd_errstr(err));
error = EIO;
goto fail;
}
/* 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 out error (addr %d): %s\n",
device_get_nameunit(sc->sc_dev), sc->sc_bulkout_no,
usbd_errstr(err));
error = EIO;
goto fail;
}
/* 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;
}
sc->sc_ibuf = usbd_alloc_buffer(sc->sc_ixfer,
sc->sc_ibufsizepad);
if (sc->sc_ibuf == NULL) {
error = ENOMEM;
goto fail;
}
sc->sc_oxfer = usbd_alloc_xfer(sc->sc_udev);
if (sc->sc_oxfer == NULL) {
error = ENOMEM;
goto fail;
}
sc->sc_obuf = usbd_alloc_buffer(sc->sc_oxfer,
sc->sc_obufsize +
sc->sc_opkthdrlen);
if (sc->sc_obuf == NULL) {
error = ENOMEM;
goto fail;
}
sc->sc_state |= UCS_RXSTOP;
ucomstartread(sc);
sc->sc_poll = 1;
return (0);
fail:
ucom_cleanup(sc);
return (error);
}
static void
ucomclose(struct tty *tp)
{
struct ucom_softc *sc;
sc = tp->t_sc;
DPRINTF(("%s: ucomclose \n", device_get_nameunit(sc->sc_dev)));
ucom_cleanup(sc);
if (sc->sc_callback->ucom_close != NULL)
sc->sc_callback->ucom_close(sc->sc_parent, sc->sc_portno);
}
static int
ucomioctl(struct tty *tp, u_long cmd, void *data, int flag, struct thread *p)
{
struct ucom_softc *sc;
int error;
sc = tp->t_sc;;
if (sc->sc_dying)
return (EIO);
DPRINTF(("ucomioctl: cmd = 0x%08lx\n", cmd));
error = ENOTTY;
if (sc->sc_callback->ucom_ioctl != NULL)
error = sc->sc_callback->ucom_ioctl(sc->sc_parent,
sc->sc_portno,
cmd, data, flag, p);
return (error);
}
static int
ucommodem(struct tty *tp, int sigon, int sigoff)
{
struct ucom_softc *sc;
int mcr;
int msr;
int onoff;
sc = tp->t_sc;
if (sigon == 0 && sigoff == 0) {
mcr = sc->sc_mcr;
if (ISSET(mcr, SER_DTR))
sigon |= SER_DTR;
if (ISSET(mcr, SER_RTS))
sigon |= SER_RTS;
msr = sc->sc_msr;
if (ISSET(msr, SER_CTS))
sigon |= SER_CTS;
if (ISSET(msr, SER_DCD))
sigon |= SER_DCD;
if (ISSET(msr, SER_DSR))
sigon |= SER_DSR;
if (ISSET(msr, SER_RI))
sigon |= SER_RI;
return (sigon);
}
mcr = sc->sc_mcr;
if (ISSET(sigon, SER_DTR))
mcr |= SER_DTR;
if (ISSET(sigoff, SER_DTR))
mcr &= ~SER_DTR;
if (ISSET(sigon, SER_RTS))
mcr |= SER_RTS;
if (ISSET(sigoff, SER_RTS))
mcr &= ~SER_RTS;
sc->sc_mcr = mcr;
onoff = ISSET(sc->sc_mcr, SER_DTR) ? 1 : 0;
ucom_dtr(sc, onoff);
onoff = ISSET(sc->sc_mcr, SER_RTS) ? 1 : 0;
ucom_rts(sc, onoff);
return (0);
}
static void
ucombreak(struct tty *tp, int onoff)
{
struct ucom_softc *sc;
sc = tp->t_sc;
DPRINTF(("ucombreak: 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), SER_DCD)) {
if (sc->sc_poll == 0)
return;
onoff = ISSET(sc->sc_msr, SER_DCD) ? 1 : 0;
DPRINTF(("ucom_status_change: DCD changed to %d\n", onoff));
ttyld_modem(tp, onoff);
}
}
static int
ucomparam(struct tty *tp, struct termios *t)
{
struct ucom_softc *sc;
int error;
usbd_status uerr;
sc = tp->t_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)ucommodem(tp, SER_RTS, 0);
}
ttyldoptim(tp);
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;
sc = tp->t_sc;
DPRINTF(("ucomstart: sc = %p\n", sc));
if (sc->sc_dying)
return;
/*
* If there's no sc_oxfer, then ucomclose has removed it. The buffer
* has just been flushed in the ttyflush() in ttyclose(). ttyflush()
* then calls tt_stop(). ucomstop calls ucomstart, so the right thing
* to do here is just abort if sc_oxfer is NULL, as everything else
* is cleaned up elsewhere.
*/
if (sc->sc_oxfer == NULL)
return;
s = spltty();
if (tp->t_state & TS_TBLOCK) {
if (ISSET(sc->sc_mcr, SER_RTS) &&
ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
DPRINTF(("ucomstart: clear RTS\n"));
(void)ucommodem(tp, 0, SER_RTS);
}
} else {
if (!ISSET(sc->sc_mcr, SER_RTS) &&
tp->t_rawq.c_cc <= tp->t_ilowat &&
ISSET(sc->sc_state, UCS_RTS_IFLOW)) {
DPRINTF(("ucomstart: set RTS\n"));
(void)ucommodem(tp, SER_RTS, 0);
}
}
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));
}
selwakeuppri(&tp->t_wsel, TTIPRI);
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;
sc = tp->t_sc;
DPRINTF(("ucomstop: %d\n", flag));
if ((flag & FREAD) && (sc->sc_state & UCS_RXSTOP) == 0) {
DPRINTF(("ucomstop: read\n"));
ucomstopread(sc);
ucomstartread(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);
}
ucomstart(tp);
DPRINTF(("ucomstop: done\n"));
}
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",
device_get_nameunit(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));
if (cc <= sc->sc_opkthdrlen) {
printf("%s: sent size too small, cc = %d\n",
device_get_nameunit(sc->sc_dev), cc);
goto error;
}
/* 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);
ttyld_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"));
if (sc->sc_bulkin_pipe == NULL || (sc->sc_state & UCS_RXSTOP) == 0)
return (USBD_NORMAL_COMPLETION);
sc->sc_state &= ~UCS_RXSTOP;
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 && err != USBD_IN_PROGRESS) {
sc->sc_state |= UCS_RXSTOP;
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;
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",
device_get_nameunit(sc->sc_dev), usbd_errstr(status));
sc->sc_state |= UCS_RXSTOP;
if (status == USBD_STALLED)
usbd_clear_endpoint_stall_async(sc->sc_bulkin_pipe);
/* XXX we should restart after some delay. */
return;
}
sc->sc_state |= UCS_RXSTOP;
usbd_get_xfer_status(xfer, NULL, (void **)&cp, &cc, NULL);
DPRINTF(("ucomreadcb: got %d chars, tp = %p\n", cc, tp));
if (cc == 0)
goto resubmit;
if (sc->sc_callback->ucom_read != NULL)
sc->sc_callback->ucom_read(sc->sc_parent, sc->sc_portno,
&cp, &cc);
if (cc > sc->sc_ibufsize) {
printf("%s: invalid receive data size, %d chars\n",
device_get_nameunit(sc->sc_dev), cc);
goto resubmit;
}
if (cc < 1)
goto resubmit;
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", device_get_nameunit(sc->sc_dev),
lostcc);
} else {
/* Give characters to tty layer. */
while (cc > 0) {
DPRINTFN(7, ("ucomreadcb: char = 0x%02x\n", *cp));
if (ttyld_rint(tp, *cp) == -1) {
/* XXX what should we do? */
printf("%s: lost %d chars\n",
device_get_nameunit(sc->sc_dev), cc);
break;
}
cc--;
cp++;
}
}
splx(s);
resubmit:
err = ucomstartread(sc);
if (err) {
printf("%s: read start failed\n", device_get_nameunit(sc->sc_dev));
/* XXX what should we dow now? */
}
if ((sc->sc_state & UCS_RTS_IFLOW) && !ISSET(sc->sc_mcr, SER_RTS)
&& !(tp->t_state & TS_TBLOCK))
ucommodem(tp, SER_RTS, 0);
}
static void
ucom_cleanup(struct ucom_softc *sc)
{
DPRINTF(("ucom_cleanup: closing pipes\n"));
ucom_shutdown(sc);
if (sc->sc_bulkin_pipe != NULL) {
sc->sc_state |= UCS_RXSTOP;
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)
{
usbd_status err;
DPRINTF(("ucomstopread: enter\n"));
if (!(sc->sc_state & UCS_RXSTOP)) {
sc->sc_state |= UCS_RXSTOP;
if (sc->sc_bulkin_pipe == NULL) {
DPRINTF(("ucomstopread: bulkin pipe NULL\n"));
return;
}
err = usbd_abort_pipe(sc->sc_bulkin_pipe);
if (err) {
DPRINTF(("ucomstopread: err = %s\n",
usbd_errstr(err)));
}
}
DPRINTF(("ucomstopread: leave\n"));
}