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authoraugustss <augustss@NetBSD.org>2001-12-05 14:50:13 +0000
committeraugustss <augustss@NetBSD.org>2001-12-05 14:50:13 +0000
commit8c2cf4c7d88cf426e64d6dec2172d0ef752d70eb (patch)
tree4c2f3e18cdfd898213552cdda6a3e678de740494 /sys/dev
parent20b9d8348621bee52c4f4e18b5c3ba9621bf9f4e (diff)
Break out SIR framing to its own file.
Diffstat (limited to 'sys/dev')
-rw-r--r--sys/dev/ir/irframe.c4
-rw-r--r--sys/dev/ir/irframe_tty.c145
-rw-r--r--sys/dev/ir/sir.c143
-rw-r--r--sys/dev/ir/sir.h64
4 files changed, 235 insertions, 121 deletions
diff --git a/sys/dev/ir/irframe.c b/sys/dev/ir/irframe.c
index 469f732282a..98b283b9928 100644
--- a/sys/dev/ir/irframe.c
+++ b/sys/dev/ir/irframe.c
@@ -1,4 +1,4 @@
-/* $NetBSD: irframe.c,v 1.7 2001/12/05 04:30:24 augustss Exp $ */
+/* $NetBSD: irframe.c,v 1.8 2001/12/05 14:50:14 augustss Exp $ */
/*
* Copyright (c) 2001 The NetBSD Foundation, Inc.
@@ -182,7 +182,7 @@ irframeopen(dev_t dev, int flag, int mode, struct proc *p)
return (error);
}
sc->sc_open = 1;
- irf_reset_params(sc);
+ (void)irf_reset_params(sc);
return (0);
}
diff --git a/sys/dev/ir/irframe_tty.c b/sys/dev/ir/irframe_tty.c
index 81791cfa344..8810eef47b2 100644
--- a/sys/dev/ir/irframe_tty.c
+++ b/sys/dev/ir/irframe_tty.c
@@ -1,4 +1,4 @@
-/* $NetBSD: irframe_tty.c,v 1.8 2001/12/05 04:31:02 augustss Exp $ */
+/* $NetBSD: irframe_tty.c,v 1.9 2001/12/05 14:50:14 augustss Exp $ */
/*
* TODO
@@ -46,7 +46,7 @@
/*
* Loosely based on ppp_tty.c.
- * Framing and dongle handing written by Tommy Bohlin.
+ * Framing and dongle handling written by Tommy Bohlin.
*/
#include <sys/param.h>
@@ -63,6 +63,7 @@
#include <sys/poll.h>
#include <dev/ir/ir.h>
+#include <dev/ir/sir.h>
#include <dev/ir/irdaio.h>
#include <dev/ir/irframevar.h>
@@ -80,13 +81,6 @@ int irframetdebug = 0;
#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? */
@@ -152,9 +146,8 @@ 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_write_frame(void *h, u_int8_t *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);
@@ -170,52 +163,6 @@ irframettyattach(int n)
}
/*
- * CRC computation
- */
-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
-};
-
-#define INITFCS 0xffff
-#define 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.
@@ -323,11 +270,7 @@ irframetioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
sc->sc_dongle = *(int *)data;
break;
default:
-#if 0
- error = irframeioctl(sc, cmd, data, flag, p);
-#else
error = EINVAL;
-#endif
break;
}
@@ -335,9 +278,7 @@ irframetioctl(struct tty *tp, u_long cmd, caddr_t data, int flag,
}
/*
- * Start output on async tty interface. If the transmit queue
- * has drained sufficiently, arrange for irframeasyncstart to be
- * called later at splsoftnet.
+ * Start output on async tty interface.
* Called at spltty or higher.
*/
int
@@ -347,10 +288,6 @@ irframetstart(struct tty *tp)
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);
@@ -579,6 +516,11 @@ irt_putc(int c, struct tty *tp)
int s;
int error;
+#if IRFRAMET_DEBUG
+ if (irframetdebug > 3)
+ DPRINTF(("%s: tp=%p c=0x%02x cc=%d\n", __FUNCTION__, tp, c,
+ tp->t_outq.c_cc));
+#endif
if (tp->t_outq.c_cc > tp->t_hiwat) {
irframetstart(tp);
s = spltty();
@@ -605,75 +547,38 @@ irt_putc(int c, struct tty *tp)
}
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)
{
+ struct tty *tp = h;
+ struct irframet_softc *sc = (struct irframet_softc *)tp->t_sc;
u_int8_t buf[MAX_IRDA_FRAME];
- size_t n;
- int error;
+ int n;
DPRINTF(("%s: resid=%d, iovcnt=%d, offset=%ld\n",
__FUNCTION__, uio->uio_resid, uio->uio_iovcnt,
(long)uio->uio_offset));
- 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));
+ n = irda_sir_frame(buf, MAX_IRDA_FRAME, uio, sc->sc_ebofs);
+ if (n < 0)
+ return (-n);
+ return (irt_write_frame(h, buf, n));
}
int
-irt_write_buf(void *h, void *buf, size_t len)
+irt_write_frame(void *h, u_int8_t *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;
+ int error, 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);
+ for (i = 0; !error && i < len; i++)
+ error = irt_putc(buf[i], tp);
irframetstart(tp);
- DPRINTF(("%s: done\n", __FUNCTION__));
+ DPRINTF(("%s: done, error=%d\n", __FUNCTION__, error));
return (error);
}
@@ -689,9 +594,11 @@ irframet_poll(void *h, int events, struct proc *p)
DPRINTF(("%s: sc=%p\n", __FUNCTION__, sc));
s = splir();
- /* XXX should check with tty */
+ /* XXX is this a good check? */
if (events & (POLLOUT | POLLWRNORM))
- revents |= events & (POLLOUT | POLLWRNORM);
+ if (tp->t_outq.c_cc <= tp->t_lowat)
+ revents |= events & (POLLOUT | POLLWRNORM);
+
if (events & (POLLIN | POLLRDNORM)) {
if (sc->sc_nframes > 0) {
DPRINTF(("%s: have data\n", __FUNCTION__));
diff --git a/sys/dev/ir/sir.c b/sys/dev/ir/sir.c
new file mode 100644
index 00000000000..3a791bc98de
--- /dev/null
+++ b/sys/dev/ir/sir.c
@@ -0,0 +1,143 @@
+/* $NetBSD: sir.c,v 1.1 2001/12/05 14:50:14 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) and Tommy Bohlin
+ * (tommy@gatespace.com).
+ *
+ * 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.
+ */
+
+/*
+ * Framing originally written by Tommy Bohlin.
+ */
+
+#include <sys/param.h>
+#include <sys/conf.h>
+#include <sys/systm.h>
+
+#include <dev/ir/sir.h>
+
+/*
+ * CRC computation table
+ */
+const u_int16_t irda_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
+};
+
+
+#define MAX_IRDA_FRAME 5000 /* XXX what is it? */
+
+#define PUTC(c) if (p < end) *p++ = (c)
+#define PUTESC(c) \
+ if (c == SIR_BOF || c == SIR_EOF || c == SIR_CE) { \
+ PUTC(SIR_CE); \
+ PUTC(SIR_ESC_BIT^c); \
+ } else { \
+ PUTC(c); \
+ }
+
+int
+irda_sir_frame(u_int8_t *obuf, u_int maxlen, struct uio *uio, u_int ebofs)
+{
+ u_int8_t ibuf[MAX_IRDA_FRAME];
+ u_int8_t *p, *end, *cp;
+ size_t n;
+ int error;
+ int i;
+ int c;
+ u_int16_t ofcs;
+
+ n = uio->uio_resid;
+ if (n > MAX_IRDA_FRAME)
+ return (EINVAL);
+ error = uiomove(ibuf, n, uio);
+ if (error)
+ return (-error);
+
+ end = obuf + maxlen;
+
+ for (i = 0; i < ebofs; i++)
+ PUTC(SIR_EXTRA_BOF);
+ PUTC(SIR_BOF);
+
+ ofcs = INITFCS;
+ cp = ibuf;
+ while (n-- > 0) {
+ c = *cp++;
+ ofcs = updateFCS(ofcs, c);
+ PUTESC(c);
+ }
+
+ ofcs = ~ofcs;
+ c = ofcs & 0xff;
+ PUTESC(c);
+ c = (ofcs >> 8) & 0xff;
+ PUTESC(c);
+ PUTC(SIR_EOF);
+
+ if (p < end)
+ return (p - obuf);
+ else
+ return (-EINVAL);
+}
diff --git a/sys/dev/ir/sir.h b/sys/dev/ir/sir.h
new file mode 100644
index 00000000000..d33fb93cf20
--- /dev/null
+++ b/sys/dev/ir/sir.h
@@ -0,0 +1,64 @@
+/* $NetBSD: sir.h,v 1.1 2001/12/05 14:50:14 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) and Tommy Bohlin
+ * (tommy@gatespace.com).
+ *
+ * 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.
+ */
+
+/*
+ * Framing originally written by Tommy Bohlin.
+ */
+
+/* Protocol constants */
+#define SIR_EXTRA_BOF 0xff
+#define SIR_BOF 0xc0
+#define SIR_CE 0x7d
+#define SIR_EOF 0xc1
+
+#define SIR_ESC_BIT 0x20
+
+int irda_sir_frame(u_int8_t *buf, u_int maxlen, struct uio *uio, u_int ebofs);
+
+/*
+ * CRC computation
+ */
+#define INITFCS 0xffff
+#define GOODFCS 0xf0b8
+
+extern const u_int16_t irda_fcstab[];
+
+static __inline u_int16_t updateFCS(u_int16_t fcs, int c) {
+ return (fcs >> 8) ^ irda_fcstab[(fcs^c) & 0xff];
+}