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NetBSD/sys/dev/ir/irframe_tty.c

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/* $NetBSD: irframe_tty.c,v 1.2 2001/12/04 19:56:43 augustss Exp $ */
/*
* Copyright (c) 2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Lennart Augustsson (lennart@augustsson.net).
*
* 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.
*/
/*
* Loosely based on ppp_tty.c.
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/ioctl.h>
#include <sys/tty.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/poll.h>
#include <dev/ir/ir.h>
#include <dev/ir/irdaio.h>
#include <dev/ir/irframevar.h>
/* Macros to clear/set/test flags. */
#define SET(t, f) (t) |= (f)
#define CLR(t, f) (t) &= ~(f)
#define ISSET(t, f) ((t) & (f))
#ifdef IRFRAMET_DEBUG
#define DPRINTF(x) if (irframetdebug) printf x
#define Static
int irframetdebug = 1;
#else
#define DPRINTF(x)
#define Static static
#endif
/* Protocol constants */
#define SIR_EXTRA_BOF 0xff
#define SIR_BOF 0xc0
#define SIR_CE 0x7d
#define SIR_EOF 0xc1
#define SIR_ESC_BIT 0x20
/*****/
#define MAX_IRDA_FRAME 5000 /* XXX what is it? */
struct frame {
u_char *buf;
u_int len;
};
#define MAXFRAMES 4
struct irframet_softc {
struct irframe_softc sc_irp;
struct tty *sc_tp;
int sc_state;
#define IRT_RSLP 0x01 /* waiting for data (read) */
#if 0
#define IRT_WSLP 0x02 /* waiting for data (write) */
#define IRT_CLOSING 0x04 /* waiting for output to drain */
#endif
int sc_ebofs;
u_char* sc_inbuf;
int sc_maxsize;
int sc_framestate;
#define FRAME_OUTSIDE 0
#define FRAME_INSIDE 1
#define FRAME_ESCAPE 2
int sc_inchars;
int sc_inFCS;
struct callout sc_timeout;
u_int sc_nframes;
u_int sc_framei;
u_int sc_frameo;
struct frame sc_frames[MAXFRAMES];
struct selinfo sc_rsel;
};
/* line discipline methods */
int irframetopen(dev_t dev, struct tty *tp);
int irframetclose(struct tty *tp, int flag);
int irframetioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
struct proc *);
int irframetinput(int c, struct tty *tp);
int irframetstart(struct tty *tp);
/* pseudo device init */
void irframettyattach(int);
/* irframe methods */
Static int irframet_open(void *h, int flag, int mode, struct proc *p);
Static int irframet_close(void *h, int flag, int mode, struct proc *p);
Static int irframet_read(void *h, struct uio *uio, int flag);
Static int irframet_write(void *h, struct uio *uio, int flag);
Static int irframet_poll(void *h, int events, struct proc *p);
Static int irframet_set_params(void *h, struct irda_params *params);
Static int irframet_get_speeds(void *h, int *speeds);
Static int irframet_get_turnarounds(void *h, int *times);
/* internal */
Static int irt_write_buf(void *h, void *buf, size_t len);
Static int irt_putc(int c, struct tty *tp);
Static int irt_putesc(int c, struct tty *tp);
Static void irt_frame(struct irframet_softc *sc, u_char *buf, u_int len);
Static void irt_timeout(void *v);
Static struct irframe_methods irframet_methods = {
irframet_open, irframet_close, irframet_read, irframet_write,
irframet_poll, irframet_set_params,
irframet_get_speeds, irframet_get_turnarounds
};
void
irframettyattach(int n)
{
}
/*
* CRC
*/
static const u_int16_t fcstab[] = {
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
static const u_int16_t INITFCS = 0xffff;
static const u_int16_t GOODFCS = 0xf0b8;
static __inline u_int16_t updateFCS(u_int16_t fcs, int c) {
return (fcs >> 8) ^ fcstab[(fcs^c) & 0xff];
}
/*
* Line specific open routine for async tty devices.
* Attach the given tty to the first available irframe unit.
* Called from device open routine or ttioctl.
*/
/* ARGSUSED */
int
irframetopen(dev_t dev, struct tty *tp)
{
struct proc *p = curproc; /* XXX */
struct irframet_softc *sc;
int error, s;
DPRINTF(("%s\n", __FUNCTION__));
if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
return (error);
s = spltty();
DPRINTF(("%s: linesw=%p disc=%d\n", __FUNCTION__, tp->t_linesw,
tp->t_linesw->l_no));
if (tp->t_linesw->l_no == IRFRAMEDISC) {
sc = (struct irframet_softc *)tp->t_sc;
DPRINTF(("%s: sc=%p sc_tp=%p\n", __FUNCTION__, sc, sc->sc_tp));
if (sc != NULL) {
splx(s);
return (EBUSY);
}
}
printf("%s attached at tty%02d:", sc->sc_irp.sc_dev.dv_xname,
minor(tp->t_dev));
tp->t_sc = irframe_alloc(sizeof (struct irframet_softc),
&irframet_methods, tp);
sc = (struct irframet_softc *)tp->t_sc;
sc->sc_tp = tp;
DPRINTF(("%s: set sc=%p\n", __FUNCTION__, sc));
ttyflush(tp, FREAD | FWRITE);
splx(s);
sc->sc_ebofs = IRDA_DEFAULT_EBOFS;
sc->sc_maxsize = 0;
sc->sc_framestate = FRAME_OUTSIDE;
sc->sc_nframes = 0;
sc->sc_framei = 0;
sc->sc_frameo = 0;
callout_init(&sc->sc_timeout);
return (0);
}
/*
* Line specific close routine, called from device close routine
* and from ttioctl.
* Detach the tty from the irframe unit.
* Mimics part of ttyclose().
*/
int
irframetclose(struct tty *tp, int flag)
{
struct irframet_softc *sc = (struct irframet_softc *)tp->t_sc;
int s;
int i;
DPRINTF(("%s: tp=%p\n", __FUNCTION__, tp));
callout_stop(&sc->sc_timeout);
s = splir();
if (sc->sc_inbuf != NULL) {
free(sc->sc_inbuf, M_DEVBUF);
sc->sc_inbuf = NULL;
}
for (i = 0; i < MAXFRAMES; i++) {
if (sc->sc_frames[i].buf != NULL) {
free(sc->sc_frames[i].buf, M_DEVBUF);
sc->sc_frames[i].buf = NULL;
}
}
splx(s);
s = spltty();
ttyflush(tp, FREAD | FWRITE);
tp->t_linesw = linesw[0]; /* default line discipline */
if (sc != NULL) {
tp->t_sc = NULL;
printf("%s detached from tty%02d\n", sc->sc_irp.sc_dev.dv_xname,
minor(tp->t_dev));
if (sc->sc_tp == tp)
irframe_dealloc(&sc->sc_irp.sc_dev);
}
splx(s);
return (0);
}
/*
* Line specific (tty) ioctl routine.
* This discipline requires that tty device drivers call
* the line specific l_ioctl routine from their ioctl routines.
*/
/* ARGSUSED */
int
irframetioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
struct proc *p)
{
struct irframet_softc *sc = (struct irframet_softc *)tp->t_sc;
int error;
DPRINTF(("%s: tp=%p\n", __FUNCTION__, tp));
if (sc == NULL || tp != sc->sc_tp)
return (-1);
error = 0;
switch (cmd) {
default:
#if 0
error = irframeioctl(sc, cmd, data, flag, p);
#else
error = EINVAL;
#endif
break;
}
return (error);
}
/*
* Start output on async tty interface. If the transmit queue
* has drained sufficiently, arrange for irframeasyncstart to be
* called later at splsoftnet.
* Called at spltty or higher.
*/
int
irframetstart(struct tty *tp)
{
/*struct irframet_softc *sc = (struct irframet_softc *)tp->t_sc;*/
DPRINTF(("%s: tp=%p\n", __FUNCTION__, tp));
/*
* If there is stuff in the output queue, send it now.
* We are being called in lieu of ttstart and must do what it would.
*/
if (tp->t_oproc != NULL)
(*tp->t_oproc)(tp);
return (0);
}
void
irt_frame(struct irframet_softc *sc, u_char *buf, u_int len)
{
if (sc->sc_nframes >= MAXFRAMES) {
#ifdef IRFRAMET_DEBUG
printf("%s: dropped frame\n", __FUNCTION__);
#endif
return;
}
if (sc->sc_frames[sc->sc_framei].buf == NULL)
return;
memcpy(sc->sc_frames[sc->sc_framei].buf, buf, len);
sc->sc_frames[sc->sc_framei].len = len;
sc->sc_framei = (sc->sc_framei+1) % MAXFRAMES;
sc->sc_nframes++;
if (sc->sc_state & IRT_RSLP) {
sc->sc_state &= ~IRT_RSLP;
DPRINTF(("%s: waking up reader\n", __FUNCTION__));
wakeup(sc->sc_frames);
}
selwakeup(&sc->sc_rsel);
}
void
irt_timeout(void *v)
{
struct irframet_softc *sc = v;
#ifdef IRFRAMET_DEBUG
if (sc->sc_framestate != FRAME_OUTSIDE)
printf("%s: input frame timeout\n", __FUNCTION__);
#endif
sc->sc_framestate = FRAME_OUTSIDE;
}
int
irframetinput(int c, struct tty *tp)
{
struct irframet_softc *sc = (struct irframet_softc *)tp->t_sc;
DPRINTF(("%s: tp=%p c=0x%0x\n", __FUNCTION__, tp, c));
if (sc == NULL || tp != (struct tty *)sc->sc_tp)
return (0);
if (sc->sc_inbuf == NULL)
return (0);
switch (c) {
case SIR_BOF:
sc->sc_framestate = FRAME_INSIDE;
sc->sc_inchars = 0;
sc->sc_inFCS = INITFCS;
break;
case SIR_EOF:
if (sc->sc_framestate == FRAME_INSIDE &&
sc->sc_inchars >= 4 && sc->sc_inFCS == GOODFCS) {
irt_frame(sc, sc->sc_inbuf, sc->sc_inchars - 2);
} else if (sc->sc_framestate != FRAME_OUTSIDE) {
#ifdef IRFRAMET_DEBUG
printf("%s: malformed input frame\n", __FUNCTION__);
#endif
}
sc->sc_framestate = FRAME_OUTSIDE;
break;
case SIR_CE:
if (sc->sc_framestate == FRAME_INSIDE)
sc->sc_framestate = FRAME_ESCAPE;
break;
default:
if (sc->sc_framestate != FRAME_OUTSIDE) {
if (sc->sc_framestate == FRAME_ESCAPE) {
sc->sc_framestate = FRAME_INSIDE;
c ^= SIR_ESC_BIT;
}
if (sc->sc_inchars < sc->sc_maxsize + 2) {
sc->sc_inbuf[sc->sc_inchars++] = c;
sc->sc_inFCS = updateFCS(sc->sc_inFCS, c);
} else {
sc->sc_framestate = FRAME_OUTSIDE;
#ifdef IRFRAMET_DEBUG
printf("%s: input frame overrun\n",
__FUNCTION__);
#endif
}
}
break;
}
if (sc->sc_framestate != FRAME_OUTSIDE) {
callout_reset(&sc->sc_timeout, hz/100, irt_timeout, sc);
}
return (0);
}
/*** irframe methods ***/
int
irframet_open(void *h, int flag, int mode, struct proc *p)
{
struct tty *tp = h;
tp = tp;
DPRINTF(("%s: tp=%p\n", __FUNCTION__, tp));
return (0);
}
int
irframet_close(void *h, int flag, int mode, struct proc *p)
{
struct tty *tp = h;
tp = tp;
DPRINTF(("%s: tp=%p\n", __FUNCTION__, tp));
return (0);
}
int
irframet_read(void *h, struct uio *uio, int flag)
{
struct tty *tp = h;
struct irframet_softc *sc = (struct irframet_softc *)tp->t_sc;
int error = 0;
int s;
DPRINTF(("%s: resid=%d, iovcnt=%d, offset=%ld\n",
__FUNCTION__, uio->uio_resid, uio->uio_iovcnt,
(long)uio->uio_offset));
s = splir();
while (sc->sc_nframes == 0) {
if (flag & IO_NDELAY) {
splx(s);
return (EWOULDBLOCK);
}
sc->sc_state |= IRT_RSLP;
DPRINTF(("%s: sleep\n", __FUNCTION__));
error = tsleep(sc->sc_frames, PZERO | PCATCH, "irtrd", 0);
DPRINTF(("%s: woke, error=%d\n", __FUNCTION__, error));
if (error) {
sc->sc_state &= ~IRT_RSLP;
break;
}
}
/* Do just one frame transfer per read */
if (!error) {
if (uio->uio_resid < sc->sc_frames[sc->sc_frameo].len) {
DPRINTF(("%s: uio buffer smaller than frame size (%d < %d)\n", __FUNCTION__, uio->uio_resid, sc->sc_frames[sc->sc_frameo].len));
error = EINVAL;
} else {
DPRINTF(("%s: moving %d bytes\n", __FUNCTION__,
sc->sc_frames[sc->sc_frameo].len));
error = uiomove(sc->sc_frames[sc->sc_frameo].buf,
sc->sc_frames[sc->sc_frameo].len, uio);
}
sc->sc_frameo++;
sc->sc_nframes--;
}
splx(s);
return (error);
}
int
irt_putc(int c, struct tty *tp)
{
int s;
int error;
if (tp->t_outq.c_cc > tp->t_hiwat) {
irframetstart(tp);
s = spltty();
/*
* This can only occur if FLUSHO is set in t_lflag,
* or if ttstart/oproc is synchronous (or very fast).
*/
if (tp->t_outq.c_cc <= tp->t_hiwat) {
splx(s);
goto go;
}
SET(tp->t_state, TS_ASLEEP);
error = ttysleep(tp, &tp->t_outq, TTOPRI | PCATCH, ttyout, 0);
splx(s);
if (error)
return (error);
}
go:
if (putc(c, &tp->t_rawq) < 0) {
printf("irframe: putc failed\n");
return (EIO);
}
return (0);
}
int
irt_putesc(int c, struct tty *tp)
{
int error;
if (c == SIR_BOF || c == SIR_EOF || c == SIR_CE) {
error = irt_putc(SIR_CE, tp);
if (!error)
error = irt_putc(SIR_ESC_BIT^c, tp);
} else {
error = irt_putc(c, tp);
}
return (error);
}
int
irframet_write(void *h, struct uio *uio, int flag)
{
u_int8_t buf[MAX_IRDA_FRAME];
size_t n;
int error;
DPRINTF(("%s\n", __FUNCTION__));
n = uio->uio_resid;
if (n > MAX_IRDA_FRAME)
return (EINVAL);
error = uiomove(buf, n, uio);
if (error)
return (error);
return (irt_write_buf(h, buf, n));
}
int
irt_write_buf(void *h, void *buf, size_t len)
{
struct tty *tp = h;
struct irframet_softc *sc = (struct irframet_softc *)tp->t_sc;
u_int8_t *cp = buf;
int c, error, ofcs, i;
DPRINTF(("%s: tp=%p len=%d\n", __FUNCTION__, tp, len));
ofcs = INITFCS;
error = 0;
for (i = 0; i < sc->sc_ebofs; i++)
irt_putc(SIR_EXTRA_BOF, tp);
irt_putc(SIR_BOF, tp);
while (len-- > 0) {
c = *cp++;
ofcs = updateFCS(ofcs, c);
error = irt_putesc(c, tp);
if (error)
return (error);
}
ofcs = ~ofcs;
error = irt_putesc(ofcs & 0xff, tp);
if (!error)
error = irt_putesc((ofcs >> 8) & 0xff, tp);
if (!error)
error = irt_putc(SIR_EOF, tp);
irframetstart(tp);
return (error);
}
int
irframet_poll(void *h, int events, struct proc *p)
{
struct tty *tp = h;
struct irframet_softc *sc = (struct irframet_softc *)tp->t_sc;
int revents = 0;
int s;
DPRINTF(("%s: sc=%p\n", __FUNCTION__, sc));
s = splir();
if (events & (POLLOUT | POLLWRNORM))
revents |= events & (POLLOUT | POLLWRNORM);
if (events & (POLLIN | POLLRDNORM)) {
if (sc->sc_nframes > 0) {
DPRINTF(("%s: have data\n", __FUNCTION__));
revents |= events & (POLLIN | POLLRDNORM);
} else {
DPRINTF(("%s: recording select", __FUNCTION__));
selrecord(p, &sc->sc_rsel);
}
}
splx(s);
return (revents);
}
int
irframet_set_params(void *h, struct irda_params *p)
{
struct tty *tp = h;
struct irframet_softc *sc = (struct irframet_softc *)tp->t_sc;
int i;
DPRINTF(("%s: tp=%p\n", __FUNCTION__, tp));
/* XXX speed */
sc->sc_ebofs = p->ebofs;
if (sc->sc_maxsize != p->maxsize) {
sc->sc_maxsize = p->maxsize;
if (sc->sc_inbuf != NULL)
free(sc->sc_inbuf, M_DEVBUF);
for (i = 0; i < MAXFRAMES; i++)
if (sc->sc_frames[i].buf != NULL)
free(sc->sc_frames[i].buf, M_DEVBUF);
if (sc->sc_maxsize != 0) {
sc->sc_inbuf = malloc(sc->sc_maxsize+2, M_DEVBUF,
M_WAITOK);
for (i = 0; i < MAXFRAMES; i++)
sc->sc_frames[i].buf = malloc(sc->sc_maxsize,
M_DEVBUF, M_WAITOK);
} else {
sc->sc_inbuf = NULL;
for (i = 0; i < MAXFRAMES; i++)
sc->sc_frames[i].buf = NULL;
}
}
sc->sc_framestate = FRAME_OUTSIDE;
return (0);
}
int
irframet_get_speeds(void *h, int *speeds)
{
struct tty *tp = h;
tp = tp;
DPRINTF(("%s: tp=%p\n", __FUNCTION__, tp));
*speeds = IRDA_SPEEDS_SIR;
return (0);
}
int
irframet_get_turnarounds(void *h, int *turnarounds)
{
struct tty *tp = h;
tp = tp;
DPRINTF(("%s: tp=%p\n", __FUNCTION__, tp));
*turnarounds = IRDA_TURNT_10000;
return (0);
}
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