Cleaned up. lpt is MI now.

3 files changed, 580 insertions, 0 deletions

diff --git a/sys/dev/ic/lpt.c b/sys/dev/ic/lpt.c
new file mode 100644
index 00000000000..9dc974779f1
--- /dev/null
+++ b/sys/dev/ic/lpt.c
@@ -0,0 +1,438 @@
+/*	$OpenBSD: lpt.c,v 1.1 1996/11/30 00:53:35 niklas Exp $ */
+/*	$NetBSD: lpt.c,v 1.42 1996/10/21 22:41:14 thorpej Exp $	*/
+
+/*
+ * Copyright (c) 1993, 1994 Charles Hannum.
+ * Copyright (c) 1990 William F. Jolitz, TeleMuse
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This software is a component of "386BSD" developed by 
+ *	William F. Jolitz, TeleMuse.
+ * 4. Neither the name of the developer nor the name "386BSD"
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 
+ * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 
+ * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 
+ * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 
+ * NOT MAKE USE OF THIS WORK.
+ *
+ * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
+ * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 
+ * REFERENCES SUCH AS THE  "PORTING UNIX TO THE 386" SERIES 
+ * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 
+ * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 
+ * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 
+ * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 
+ * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``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 DEVELOPER 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.
+ */
+
+/*
+ * Device Driver for AT parallel printer port
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/user.h>
+#include <sys/buf.h>
+#include <sys/kernel.h>
+#include <sys/ioctl.h>
+#include <sys/uio.h>
+#include <sys/device.h>
+#include <sys/conf.h>
+#include <sys/syslog.h>
+
+#include <machine/bus.h>
+#include <machine/intr.h>
+
+#include <dev/ic/lptreg.h>
+#include <dev/ic/lptvar.h>
+
+#include "lpt.h"
+
+#define	TIMEOUT		hz*16	/* wait up to 16 seconds for a ready */
+#define	STEP		hz/4
+
+#define	LPTPRI		(PZERO+8)
+#define	LPT_BSIZE	1024
+
+#if !defined(DEBUG) || !defined(notdef)
+#define LPRINTF(a)
+#else
+#define LPRINTF		if (lptdebug) printf a
+int lptdebug = 1;
+#endif
+
+/* XXX does not belong here */
+cdev_decl(lpt);
+
+struct cfdriver lpt_cd = {
+	NULL, "lpt", DV_TTY
+};
+
+#define	LPTUNIT(s)	(minor(s) & 0x1f)
+#define	LPTFLAGS(s)	(minor(s) & 0xe0)
+
+#define	LPS_INVERT	(LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK)
+#define	LPS_MASK	(LPS_SELECT|LPS_NERR|LPS_NBSY|LPS_NACK|LPS_NOPAPER)
+#define	NOT_READY() \
+    ((bus_space_read_1(iot, ioh, lpt_status) ^ LPS_INVERT) & LPS_MASK)
+#define	NOT_READY_ERR() \
+    lpt_not_ready(bus_space_read_1(iot, ioh, lpt_status), sc)
+
+int	lpt_not_ready __P((u_int8_t, struct lpt_softc *));
+void	lptwakeup __P((void *arg));
+int	lptpushbytes __P((struct lpt_softc *));
+
+/*
+ * Internal routine to lptprobe to do port tests of one byte value.
+ */
+int
+lpt_port_test(iot, ioh, base, off, data, mask)
+	bus_space_tag_t iot;
+	bus_space_handle_t ioh;
+	bus_addr_t base;
+	bus_size_t off;
+	u_int8_t data, mask;
+{
+	int timeout;
+	u_int8_t temp;
+
+	data &= mask;
+	bus_space_write_1(iot, ioh, off, data);
+	timeout = 1000;
+	do {
+		delay(10);
+		temp = bus_space_read_1(iot, ioh, off) & mask;
+	} while (temp != data && --timeout);
+	LPRINTF(("lpt: port=0x%x out=0x%x in=0x%x timeout=%d\n", base + off,
+	    data, temp, timeout));
+	return (temp == data);
+}
+
+/*
+ * Reset the printer, then wait until it's selected and not busy.
+ */
+int
+lptopen(dev, flag, mode, p)
+	dev_t dev;
+	int flag;
+	int mode;
+	struct proc *p;
+{
+	int unit = LPTUNIT(dev);
+	u_int8_t flags = LPTFLAGS(dev);
+	struct lpt_softc *sc;
+	bus_space_tag_t iot;
+	bus_space_handle_t ioh;
+	u_int8_t control;
+	int error;
+	int spin;
+
+	if (unit >= lpt_cd.cd_ndevs)
+		return ENXIO;
+	sc = lpt_cd.cd_devs[unit];
+	if (!sc)
+		return ENXIO;
+
+	if ((sc->sc_flags & (LPT_POLLED|LPT_NOINTR)) == LPT_POLLED)
+		return ENXIO;
+
+#ifdef DIAGNOSTIC
+	if (sc->sc_state)
+		printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname,
+		    sc->sc_state);
+#endif
+
+	if (sc->sc_state)
+		return EBUSY;
+
+	sc->sc_state = LPT_INIT;
+	sc->sc_flags = flags;
+	LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, flags));
+	iot = sc->sc_iot;
+	ioh = sc->sc_ioh;
+
+	if ((flags & LPT_NOPRIME) == 0) {
+		/* assert INIT for 100 usec to start up printer */
+		bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT);
+		delay(100);
+	}
+
+	control = LPC_SELECT | LPC_NINIT;
+	bus_space_write_1(iot, ioh, lpt_control, control);
+
+	/* wait till ready (printer running diagnostics) */
+	for (spin = 0; NOT_READY_ERR(); spin += STEP) {
+		if (spin >= TIMEOUT) {
+			sc->sc_state = 0;
+			return EBUSY;
+		}
+
+		/* wait 1/4 second, give up if we get a signal */
+		error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP);
+		if (error != EWOULDBLOCK) {
+			sc->sc_state = 0;
+			return error;
+		}
+	}
+
+	if ((flags & LPT_NOINTR) == 0)
+		control |= LPC_IENABLE;
+	if (flags & LPT_AUTOLF)
+		control |= LPC_AUTOLF;
+	sc->sc_control = control;
+	bus_space_write_1(iot, ioh, lpt_control, control);
+
+	sc->sc_inbuf = geteblk(LPT_BSIZE);
+	sc->sc_count = 0;
+	sc->sc_state = LPT_OPEN;
+
+	if ((sc->sc_flags & LPT_NOINTR) == 0)
+		lptwakeup(sc);
+
+	LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname));
+	return 0;
+}
+
+int
+lpt_not_ready(status, sc)
+	u_int8_t status;
+	struct lpt_softc *sc;
+{
+	u_int8_t new;
+
+	status = (status ^ LPS_INVERT) & LPS_MASK;
+	new = status & ~sc->sc_laststatus;
+	sc->sc_laststatus = status;
+
+	if (new & LPS_SELECT)
+		log(LOG_NOTICE, "%s: offline\n", sc->sc_dev.dv_xname);
+	else if (new & LPS_NOPAPER)
+		log(LOG_NOTICE, "%s: out of paper\n", sc->sc_dev.dv_xname);
+	else if (new & LPS_NERR)
+		log(LOG_NOTICE, "%s: output error\n", sc->sc_dev.dv_xname);
+
+	return status;
+}
+
+void
+lptwakeup(arg)
+	void *arg;
+{
+	struct lpt_softc *sc = arg;
+	int s;
+
+	s = spltty();
+	lptintr(sc);
+	splx(s);
+
+	timeout(lptwakeup, sc, STEP);
+}
+
+/*
+ * Close the device, and free the local line buffer.
+ */
+int
+lptclose(dev, flag, mode, p)
+	dev_t dev;
+	int flag;
+	int mode;
+	struct proc *p;
+{
+	int unit = LPTUNIT(dev);
+	struct lpt_softc *sc = lpt_cd.cd_devs[unit];
+	bus_space_tag_t iot = sc->sc_iot;
+	bus_space_handle_t ioh = sc->sc_ioh;
+
+	if (sc->sc_count)
+		(void) lptpushbytes(sc);
+
+	if ((sc->sc_flags & LPT_NOINTR) == 0)
+		untimeout(lptwakeup, sc);
+
+	bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
+	sc->sc_state = 0;
+	bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT);
+	brelse(sc->sc_inbuf);
+
+	LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname));
+	return 0;
+}
+
+int
+lptpushbytes(sc)
+	struct lpt_softc *sc;
+{
+	bus_space_tag_t iot = sc->sc_iot;
+	bus_space_handle_t ioh = sc->sc_ioh;
+	int error;
+
+	if (sc->sc_flags & LPT_NOINTR) {
+		int spin, tic;
+		u_int8_t control = sc->sc_control;
+
+		while (sc->sc_count > 0) {
+			spin = 0;
+			while (NOT_READY()) {
+				if (++spin < sc->sc_spinmax)
+					continue;
+				tic = 0;
+				/* adapt busy-wait algorithm */
+				sc->sc_spinmax++;
+				while (NOT_READY_ERR()) {
+					/* exponential backoff */
+					tic = tic + tic + 1;
+					if (tic > TIMEOUT)
+						tic = TIMEOUT;
+					error = tsleep((caddr_t)sc,
+					    LPTPRI | PCATCH, "lptpsh", tic);
+					if (error != EWOULDBLOCK)
+						return error;
+				}
+				break;
+			}
+
+			bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
+			bus_space_write_1(iot, ioh, lpt_control,
+			    control | LPC_STROBE);
+			sc->sc_count--;
+			bus_space_write_1(iot, ioh, lpt_control, control);
+
+			/* adapt busy-wait algorithm */
+			if (spin*2 + 16 < sc->sc_spinmax)
+				sc->sc_spinmax--;
+		}
+	} else {
+		int s;
+
+		while (sc->sc_count > 0) {
+			/* if the printer is ready for a char, give it one */
+			if ((sc->sc_state & LPT_OBUSY) == 0) {
+				LPRINTF(("%s: write %d\n", sc->sc_dev.dv_xname,
+				    sc->sc_count));
+				s = spltty();
+				(void) lptintr(sc);
+				splx(s);
+			}
+			error = tsleep((caddr_t)sc, LPTPRI | PCATCH,
+			    "lptwrite2", 0);
+			if (error)
+				return error;
+		}
+	}
+	return 0;
+}
+
+/* 
+ * Copy a line from user space to a local buffer, then call putc to get the
+ * chars moved to the output queue.
+ */
+int
+lptwrite(dev, uio, flags)
+	dev_t dev;
+	struct uio *uio;
+	int flags;
+{
+	struct lpt_softc *sc = lpt_cd.cd_devs[LPTUNIT(dev)];
+	size_t n;
+	int error = 0;
+
+	while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) {
+		uiomove(sc->sc_cp = sc->sc_inbuf->b_data, n, uio);
+		sc->sc_count = n;
+		error = lptpushbytes(sc);
+		if (error) {
+			/*
+			 * Return accurate residual if interrupted or timed
+			 * out.
+			 */
+			uio->uio_resid += sc->sc_count;
+			sc->sc_count = 0;
+			return error;
+		}
+	}
+	return 0;
+}
+
+/*
+ * Handle printer interrupts which occur when the printer is ready to accept
+ * another char.
+ */
+int
+lptintr(arg)
+	void *arg;
+{
+	struct lpt_softc *sc = arg;
+	bus_space_tag_t iot = sc->sc_iot;
+	bus_space_handle_t ioh = sc->sc_ioh;
+
+	if (((sc->sc_state & LPT_OPEN) == 0 && sc->sc_count == 0) ||
+	    (sc->sc_flags & LPT_NOINTR))
+		return 0;
+
+	/* is printer online and ready for output */
+	if (NOT_READY() && NOT_READY_ERR())
+		return -1;
+
+	if (sc->sc_count) {
+		u_int8_t control = sc->sc_control;
+		/* send char */
+		bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++);
+		delay (50);
+		bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE);
+		sc->sc_count--;
+		bus_space_write_1(iot, ioh, lpt_control, control);
+		sc->sc_state |= LPT_OBUSY;
+	} else
+		sc->sc_state &= ~LPT_OBUSY;
+
+	if (sc->sc_count == 0) {
+		/* none, wake up the top half to get more */
+		wakeup((caddr_t)sc);
+	}
+
+	return 1;
+}
+
+int
+lptioctl(dev, cmd, data, flag, p)
+	dev_t dev;
+	u_long cmd;
+	caddr_t data;
+	int flag;
+	struct proc *p;
+{
+	int error = 0;
+
+	switch (cmd) {
+	default:
+		error = ENODEV;
+	}
+
+	return error;
+}
diff --git a/sys/dev/ic/lptreg.h b/sys/dev/ic/lptreg.h
new file mode 100644
index 00000000000..b308fe24625
--- /dev/null
+++ b/sys/dev/ic/lptreg.h
@@ -0,0 +1,64 @@
+/*	$NetBSD: lptreg.h,v 1.4 1994/10/27 04:17:56 cgd Exp $	*/
+
+/*-
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * William Jolitz.
+ *
+ * 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 University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+ *
+ *      @(#)lptreg.h	1.1 (Berkeley) 12/19/90
+ */
+
+/*
+ * AT Parallel Port (for lineprinter)
+ * Interface port and bit definitions
+ * Written by William Jolitz 12/18/90
+ * Copyright (C) William Jolitz 1990
+ */
+
+#define	lpt_data	0	/* Data to/from printer (R/W) */
+
+#define	lpt_status	1	/* Status of printer (R) */
+#define	LPS_NERR		0x08	/* printer no error */
+#define	LPS_SELECT		0x10	/* printer selected */
+#define	LPS_NOPAPER		0x20	/* printer out of paper */
+#define	LPS_NACK		0x40	/* printer no ack of data */
+#define	LPS_NBSY		0x80	/* printer no ack of data */
+
+#define	lpt_control	2	/* Control printer (R/W) */
+#define	LPC_STROBE		0x01	/* strobe data to printer */
+#define	LPC_AUTOLF		0x02	/* automatic linefeed */
+#define	LPC_NINIT		0x04	/* initialize printer */
+#define	LPC_SELECT		0x08	/* printer selected */
+#define	LPC_IENABLE		0x10	/* printer out of paper */
+
+#define	LPT_NPORTS	8
diff --git a/sys/dev/ic/lptvar.h b/sys/dev/ic/lptvar.h
new file mode 100644
index 00000000000..84596d6471d
--- /dev/null
+++ b/sys/dev/ic/lptvar.h
@@ -0,0 +1,78 @@
+/*	$OpenBSD: lptvar.h,v 1.1 1996/11/30 00:53:36 niklas Exp $ */
+/*	$NetBSD: lpt.c,v 1.42 1996/10/21 22:41:14 thorpej Exp $	*/
+
+/*
+ * Copyright (c) 1993, 1994 Charles Hannum.
+ * Copyright (c) 1990 William F. Jolitz, TeleMuse
+ * 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This software is a component of "386BSD" developed by 
+ *	William F. Jolitz, TeleMuse.
+ * 4. Neither the name of the developer nor the name "386BSD"
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 
+ * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 
+ * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 
+ * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 
+ * NOT MAKE USE OF THIS WORK.
+ *
+ * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
+ * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 
+ * REFERENCES SUCH AS THE  "PORTING UNIX TO THE 386" SERIES 
+ * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 
+ * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 
+ * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 
+ * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 
+ * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``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 DEVELOPER 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.
+ */
+
+struct lpt_softc {
+	struct device sc_dev;
+	void *sc_ih;
+
+	size_t sc_count;
+	struct buf *sc_inbuf;
+	u_int8_t *sc_cp;
+	int sc_spinmax;
+	bus_space_tag_t sc_iot;	/* bus tag */
+	bus_space_handle_t sc_ioh; /* handle to the registers */
+	u_int8_t sc_state;
+#define	LPT_OPEN	0x01	/* device is open */
+#define	LPT_OBUSY	0x02	/* printer is busy doing output */
+#define	LPT_INIT	0x04	/* waiting to initialize for open */
+	u_int8_t sc_flags;
+#define	LPT_POLLED	0x10	/* configured for polling only */
+#define	LPT_AUTOLF	0x20	/* automatic LF on CR */
+#define	LPT_NOPRIME	0x40	/* don't prime on open */
+#define	LPT_NOINTR	0x80	/* do not use interrupt */
+	u_int8_t sc_control;
+	u_int8_t sc_laststatus;
+};
+
+int	lptintr __P((void *));
+int	lpt_port_test __P((bus_space_tag_t, bus_space_handle_t, bus_addr_t,
+	    bus_size_t, u_int8_t, u_int8_t));