[unix-history] / usr / src / sys.386bsd / i386 / isa / lpt.c

/*
 * 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
 * Written by William Jolitz 12/18/90
 */

#include "lpt.h"
#if NLPT > 0

#include "param.h"
#include "user.h"
#include "buf.h"
#include "systm.h"
#include "kernel.h"
#include "ioctl.h"
#include "tty.h"
#include "uio.h"

#include "i386/isa/isa_device.h"
#include "i386/isa/lptreg.h"

#define	LPINITRDY	4	/* wait up to 4 seconds for a ready */
#define	LPTOUTTIME	4	/* wait up to 4 seconds for a ready */
#define	LPPRI		(PZERO+8)
#define	BUFSIZE		1024

#ifndef DEBUG
#define lprintf
#else
#define lprintf		if (lpflag) printf
#endif

int lptout();
#ifdef DEBUG
int lpflag = 1;
#endif

int 	lptprobe(), lptattach(), lptintr();

struct	isa_driver lptdriver = {
	lptprobe, lptattach, "lpt"
};

#define	LPTUNIT(s)	(((s)>>6)&0x3)
#define	LPTFLAGS(s)	((s)&0x3f)

struct lpt_softc {
	short	sc_port;
	short	sc_state;
	/* default case: negative prime, negative ack, handshake strobe,
	   prime once */
	u_char	sc_control;
	char	sc_flags;
#define LP_POS_INIT	0x01	/* if we are a postive init signal */
#define LP_POS_ACK	0x02	/* if we are a positive going ack */
#define LP_NO_PRIME	0x04	/* don't prime the printer at all */
#define LP_PRIMEOPEN	0x08	/* prime on every open */
#define LP_AUTOLF	0x10	/* tell printer to do an automatic lf */
#define LP_BYPASS	0x20	/* bypass  printer ready checks */
	struct	buf *sc_inbuf;
	short	sc_xfercnt ;
	char	sc_primed;
	char	*sc_cp ;
} lpt_sc[NLPT] ;

/* bits for state */
#define	OPEN		(1<<0)	/* device is open */
#define	ASLP		(1<<1)	/* awaiting draining of printer */
#define	ERROR		(1<<2)	/* error was received from printer */
#define	OBUSY		(1<<3)	/* printer is busy doing output */
#define LPTOUT		(1<<4)	/* timeout while not selected	*/
#define TOUT		(1<<5)	/* timeout while not selected	*/
#define INIT		(1<<6)	/* waiting to initialize for open */

lptprobe(idp)
	struct isa_device *idp;
{	unsigned v;

	outb(idp->id_iobase+lpt_status,0xf0);
	v = inb(idp->id_iobase+lpt_status);
	outb(idp->id_iobase+lpt_status,0);
	if (inb(idp->id_iobase+lpt_status) == v) {
		outb(idp->id_iobase+lpt_control,0xff);
		DELAY(100);
		if (inb(idp->id_iobase+lpt_control) != 0xff)
			return(0);
		outb(idp->id_iobase+lpt_control,0);
		DELAY(100);
		if (inb(idp->id_iobase+lpt_control) != 0xe0)
			return(0);
		return(1);
	}
	return(0);
}

lptattach(isdp)
	struct isa_device *isdp;
{
	struct	lpt_softc	*sc;

	sc = lpt_sc + isdp->id_unit;
	sc->sc_port = isdp->id_iobase;
	outb(sc->sc_port+lpt_control, LPC_NINIT);
	return (1);
}

/*
 * lptopen -- reset the printer, then wait until it's selected and not busy.
 */

lptopen(dev, flag)
	dev_t dev;
	int flag;
{
	struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
	int s;
	int trys, port;

	if (sc->sc_state) {
lprintf("lp: still open\n") ;
printf("still open %x\n", sc->sc_state);
		return(EBUSY);
	} else	sc->sc_state |= INIT;

	s = spltty();
	sc->sc_flags = LPTFLAGS(minor(dev));
lprintf("lp flags 0x%x\n", sc->sc_flags);
	port = sc->sc_port;

	/* init printer */
	if((sc->sc_flags & LP_NO_PRIME) == 0) {
		if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
			outb(port+lpt_control, 0);
			sc->sc_primed++;
			DELAY(500);
		}
	}
	outb(port+lpt_control, LPC_SEL|LPC_NINIT);

	/* wait till ready (printer running diagnostics) */
	trys = 0;
	do {
		/* ran out of waiting for the printer */
		if (trys++ >= LPINITRDY*4) {
			splx(s);
			sc->sc_state = 0;
printf ("status %x\n", inb(port+lpt_status) );
			return (EBUSY);
		}

		/* wait 1/4 second, give up if we get a signal */
		if (tsleep (sc, LPPRI|PCATCH, "lptinit", hz/4) != EWOULDBLOCK) {
			sc->sc_state = 0;
			splx(s);
			return (EBUSY);
		}
		
		/* is printer online and ready for output */
	} while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
			(LPS_SEL|LPS_NBSY|LPS_NERR));

	if(sc->sc_flags&LP_AUTOLF) {
		outb(port+lpt_control, LPC_SEL|LPC_NINIT|LPC_ENA|LPC_AUTOL);
		sc->sc_control = LPC_SEL|LPC_NINIT|LPC_ENA|LPC_AUTOL;
	} else {
		outb(port+lpt_control, LPC_SEL|LPC_NINIT|LPC_ENA);
		sc->sc_control = LPC_SEL|LPC_NINIT|LPC_ENA;
	}

	sc->sc_state = OPEN | TOUT;
	sc->sc_inbuf = geteblk(BUFSIZE);
	sc->sc_xfercnt = 0;
	splx(s);
	timeout (lptout, sc, hz/2);
lprintf("opened.\n");
	return(0);
}

lptout (sc)
	struct lpt_softc *sc;
{	int pl;

lprintf ("T %x ", inb(sc->sc_port+lpt_status));
	if (sc->sc_state&OPEN)
		timeout (lptout, sc, hz/2);
	else	sc->sc_state &= ~TOUT;

	if (sc->sc_state & ERROR)
		sc->sc_state &= ~ERROR;

	/*
	 * Avoid possible hangs do to missed interrupts
	 */
	if (sc->sc_xfercnt) {
		pl = spltty();
		lptintr(sc - lpt_sc);
		splx(pl);
	} else {
		sc->sc_state &= ~OBUSY;
		wakeup((caddr_t)sc);
	}
}

/*
 * lptclose -- close the device, free the local line buffer.
 */

lptclose(dev, flag)
	int flag;
{
	struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
	int port = sc->sc_port;

	sc->sc_state &= ~OPEN;
	while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
			(LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
		/* wait 1/4 second, give up if we get a signal */
		if (tsleep (sc, LPPRI|PCATCH, "lpclose", hz) != EWOULDBLOCK)
			break;

	sc->sc_state = 0;
	sc->sc_xfercnt = 0;
	outb(sc->sc_port+lpt_control, LPC_NINIT);
	brelse(sc->sc_inbuf);
lprintf("closed.\n");
	return(0);
}

/* 
 * lptwrite --copy a line from user space to a local buffer, then call 
 * putc to get the chars moved to the output queue.
 */

lptwrite(dev, uio)
	dev_t dev;
	struct uio *uio;
{
	register unsigned n;
	int pl, err;
	struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));

	while (n = MIN(BUFSIZE, uio->uio_resid)) {
		sc->sc_cp = sc->sc_inbuf->b_un.b_addr ;
		uiomove(sc->sc_cp, n, uio);
		sc->sc_xfercnt = n ;
		while (sc->sc_xfercnt > 0) {
			/* if the printer is ready for a char, give it one */
			if ((sc->sc_state & OBUSY) == 0){
lprintf("\nC %d. ", sc->sc_xfercnt);
				pl = spltty();
				lptintr(sc - lpt_sc);
				(void) splx(pl);
			}
lprintf("W ");
			if (err = tsleep (sc, LPPRI|PCATCH, "lpwrite", 0))
				return(err);
		}
	}
	return(0);
}

/*
 * lptintr -- handle printer interrupts which occur when the printer is
 * ready to accept another char.
 */

lptintr(unit)
{
	struct lpt_softc *sc = lpt_sc + unit;
	int port = sc->sc_port,sts;

	/* is printer online and ready for output */
	if (((sts=inb(port+lpt_status)) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR/*|LPS_NACK*/)) ==
			(LPS_SEL|LPS_NBSY|LPS_NERR)) {
			/* is this a false interrupt ? */
			if ((sc->sc_state & OBUSY) 
				&& (sts & LPS_NACK) == 0) return;
		sc->sc_state |= OBUSY; sc->sc_state &= ~ERROR;

		if (sc->sc_xfercnt) {
			/* send char */
/*lprintf("%x ", *sc->sc_cp); */
			outb(port+lpt_data, *sc->sc_cp++) ; sc->sc_xfercnt-- ;
			outb(port+lpt_control, sc->sc_control|LPC_STB);
			/* DELAY(X) */
			outb(port+lpt_control, sc->sc_control);
		}

		/* any more bytes for the printer? */
		if (sc->sc_xfercnt > 0) return;
	
		/* none, wake up the top half to get more */
		sc->sc_state &= ~OBUSY;
		wakeup((caddr_t)sc);
lprintf("w ");
return;
	} else	sc->sc_state |= ERROR;
lprintf("sts %x ", sts);
}

#endif NLP
Commit	Line	Data
d5decdf0 WJ	1	/*
	2	* Copyright (c) 1990 William F. Jolitz, TeleMuse
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This software is a component of "386BSD" developed by
	16	* William F. Jolitz, TeleMuse.
	17	* 4. Neither the name of the developer nor the name "386BSD"
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
	22	* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
	23	* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
	24	* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
	25	* NOT MAKE USE OF THIS WORK.
	26	*
	27	* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
	28	* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
	29	* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
	30	* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
	31	* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
	32	* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
	33	* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
	34	* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
	35	*
	36	* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
	37	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	38	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	39	* ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
	40	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	41	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	42	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	43	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	44	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	45	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	46	* SUCH DAMAGE.
	47	*
	48	*/
	49	*/
	50
	51	/*
	52	* Device Driver for AT parallel printer port
	53	* Written by William Jolitz 12/18/90
	54	*/
	55
	56	#include "lpt.h"
	57	#if NLPT > 0
	58
	59	#include "param.h"
	60	#include "user.h"
	61	#include "buf.h"
	62	#include "systm.h"
	63	#include "kernel.h"
	64	#include "ioctl.h"
65	#include "tty.h"
66	#include "uio.h"
67
68	#include "i386/isa/isa_device.h"
69	#include "i386/isa/lptreg.h"
70
71	#define LPINITRDY 4 /* wait up to 4 seconds for a ready */
72	#define LPTOUTTIME 4 /* wait up to 4 seconds for a ready */
73	#define LPPRI (PZERO+8)
74	#define BUFSIZE 1024
75
76	#ifndef DEBUG
77	#define lprintf
78	#else
79	#define lprintf if (lpflag) printf
80	#endif
81
82	int lptout();
83	#ifdef DEBUG
84	int lpflag = 1;
85	#endif
86
87	int lptprobe(), lptattach(), lptintr();
88
89	struct isa_driver lptdriver = {
90	lptprobe, lptattach, "lpt"
91	};
92
93	#define LPTUNIT(s) (((s)>>6)&0x3)
94	#define LPTFLAGS(s) ((s)&0x3f)
95
96	struct lpt_softc {
97	short sc_port;
98	short sc_state;
99	/* default case: negative prime, negative ack, handshake strobe,
100	prime once */
101	u_char sc_control;
102	char sc_flags;
103	#define LP_POS_INIT 0x01 /* if we are a postive init signal */
104	#define LP_POS_ACK 0x02 /* if we are a positive going ack */
105	#define LP_NO_PRIME 0x04 /* don't prime the printer at all */
106	#define LP_PRIMEOPEN 0x08 /* prime on every open */
107	#define LP_AUTOLF 0x10 /* tell printer to do an automatic lf */
108	#define LP_BYPASS 0x20 /* bypass printer ready checks */
109	struct buf *sc_inbuf;
110	short sc_xfercnt ;
111	char sc_primed;
112	char *sc_cp ;
113	} lpt_sc[NLPT] ;
114
115	/* bits for state */
116	#define OPEN (1<<0) /* device is open */
117	#define ASLP (1<<1) /* awaiting draining of printer */
118	#define ERROR (1<<2) /* error was received from printer */
119	#define OBUSY (1<<3) /* printer is busy doing output */
120	#define LPTOUT (1<<4) /* timeout while not selected */
121	#define TOUT (1<<5) /* timeout while not selected */
122	#define INIT (1<<6) /* waiting to initialize for open */
123
124	lptprobe(idp)
125	struct isa_device *idp;
126	{ unsigned v;
127
128	outb(idp->id_iobase+lpt_status,0xf0);
129	v = inb(idp->id_iobase+lpt_status);
130	outb(idp->id_iobase+lpt_status,0);
131	if (inb(idp->id_iobase+lpt_status) == v) {
132	outb(idp->id_iobase+lpt_control,0xff);
133	DELAY(100);
134	if (inb(idp->id_iobase+lpt_control) != 0xff)
135	return(0);
136	outb(idp->id_iobase+lpt_control,0);
137	DELAY(100);
138	if (inb(idp->id_iobase+lpt_control) != 0xe0)
139	return(0);
140	return(1);
141	}
142	return(0);
143	}
144
145	lptattach(isdp)
146	struct isa_device *isdp;
147	{
148	struct lpt_softc *sc;
149
150	sc = lpt_sc + isdp->id_unit;
151	sc->sc_port = isdp->id_iobase;
152	outb(sc->sc_port+lpt_control, LPC_NINIT);
153	return (1);
154	}
155
156	/*
157	* lptopen -- reset the printer, then wait until it's selected and not busy.
158	*/
159
160	lptopen(dev, flag)
161	dev_t dev;
162	int flag;
163	{
164	struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
165	int s;
166	int trys, port;
167
168	if (sc->sc_state) {
169	lprintf("lp: still open\n") ;
170	printf("still open %x\n", sc->sc_state);
171	return(EBUSY);
172	} else sc->sc_state \|= INIT;
173
174	s = spltty();
175	sc->sc_flags = LPTFLAGS(minor(dev));
176	lprintf("lp flags 0x%x\n", sc->sc_flags);
177	port = sc->sc_port;
178
179	/* init printer */
180	if((sc->sc_flags & LP_NO_PRIME) == 0) {
181	if((sc->sc_flags & LP_PRIMEOPEN) \|\| sc->sc_primed == 0) {
182	outb(port+lpt_control, 0);
183	sc->sc_primed++;
184	DELAY(500);
185	}
186	}
187	outb(port+lpt_control, LPC_SEL\|LPC_NINIT);
188
189	/* wait till ready (printer running diagnostics) */
190	trys = 0;
191	do {
192	/* ran out of waiting for the printer */
193	if (trys++ >= LPINITRDY*4) {
194	splx(s);
195	sc->sc_state = 0;
196	printf ("status %x\n", inb(port+lpt_status) );
197	return (EBUSY);
198	}
199
200	/* wait 1/4 second, give up if we get a signal */
201	if (tsleep (sc, LPPRI\|PCATCH, "lptinit", hz/4) != EWOULDBLOCK) {
202	sc->sc_state = 0;
203	splx(s);
204	return (EBUSY);
205	}
206
207	/* is printer online and ready for output */
208	} while ((inb(port+lpt_status) & (LPS_SEL\|LPS_OUT\|LPS_NBSY\|LPS_NERR)) !=
209	(LPS_SEL\|LPS_NBSY\|LPS_NERR));
210
211	if(sc->sc_flags&LP_AUTOLF) {
212	outb(port+lpt_control, LPC_SEL\|LPC_NINIT\|LPC_ENA\|LPC_AUTOL);
213	sc->sc_control = LPC_SEL\|LPC_NINIT\|LPC_ENA\|LPC_AUTOL;
214	} else {
215	outb(port+lpt_control, LPC_SEL\|LPC_NINIT\|LPC_ENA);
216	sc->sc_control = LPC_SEL\|LPC_NINIT\|LPC_ENA;
217	}
218
219	sc->sc_state = OPEN \| TOUT;
220	sc->sc_inbuf = geteblk(BUFSIZE);
221	sc->sc_xfercnt = 0;
222	splx(s);
223	timeout (lptout, sc, hz/2);
224	lprintf("opened.\n");
225	return(0);
226	}
227
228	lptout (sc)
229	struct lpt_softc *sc;
230	{ int pl;
231
232	lprintf ("T %x ", inb(sc->sc_port+lpt_status));
233	if (sc->sc_state&OPEN)
234	timeout (lptout, sc, hz/2);
235	else sc->sc_state &= ~TOUT;
236
237	if (sc->sc_state & ERROR)
238	sc->sc_state &= ~ERROR;
239
240	/*
241	* Avoid possible hangs do to missed interrupts
242	*/
243	if (sc->sc_xfercnt) {
244	pl = spltty();
245	lptintr(sc - lpt_sc);
246	splx(pl);
247	} else {
248	sc->sc_state &= ~OBUSY;
249	wakeup((caddr_t)sc);
250	}
251	}
252
253	/*
254	* lptclose -- close the device, free the local line buffer.
255	*/
256
257	lptclose(dev, flag)
258	int flag;
259	{
260	struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
261	int port = sc->sc_port;
262
263	sc->sc_state &= ~OPEN;
264	while ((inb(port+lpt_status) & (LPS_SEL\|LPS_OUT\|LPS_NBSY\|LPS_NERR)) !=
265	(LPS_SEL\|LPS_NBSY\|LPS_NERR) \|\| sc->sc_xfercnt)
266	/* wait 1/4 second, give up if we get a signal */
267	if (tsleep (sc, LPPRI\|PCATCH, "lpclose", hz) != EWOULDBLOCK)
268	break;
269
270	sc->sc_state = 0;
271	sc->sc_xfercnt = 0;
272	outb(sc->sc_port+lpt_control, LPC_NINIT);
273	brelse(sc->sc_inbuf);
274	lprintf("closed.\n");
275	return(0);
276	}
277
278	/*
279	* lptwrite --copy a line from user space to a local buffer, then call
280	* putc to get the chars moved to the output queue.
281	*/
282
283	lptwrite(dev, uio)
284	dev_t dev;
285	struct uio *uio;
286	{
287	register unsigned n;
288	int pl, err;
289	struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
290
291	while (n = MIN(BUFSIZE, uio->uio_resid)) {
292	sc->sc_cp = sc->sc_inbuf->b_un.b_addr ;
293	uiomove(sc->sc_cp, n, uio);
294	sc->sc_xfercnt = n ;
295	while (sc->sc_xfercnt > 0) {
296	/* if the printer is ready for a char, give it one */
297	if ((sc->sc_state & OBUSY) == 0){
298	lprintf("\nC %d. ", sc->sc_xfercnt);
299	pl = spltty();
300	lptintr(sc - lpt_sc);
301	(void) splx(pl);
302	}
303	lprintf("W ");
304	if (err = tsleep (sc, LPPRI\|PCATCH, "lpwrite", 0))
305	return(err);
306	}
307	}
308	return(0);
309	}
310
311	/*
312	* lptintr -- handle printer interrupts which occur when the printer is
313	* ready to accept another char.
314	*/
315
316	lptintr(unit)
317	{
318	struct lpt_softc *sc = lpt_sc + unit;
319	int port = sc->sc_port,sts;
320
321	/* is printer online and ready for output */
322	if (((sts=inb(port+lpt_status)) & (LPS_SEL\|LPS_OUT\|LPS_NBSY\|LPS_NERR/\|LPS_NACK/)) ==
323	(LPS_SEL\|LPS_NBSY\|LPS_NERR)) {
324	/* is this a false interrupt ? */
325	if ((sc->sc_state & OBUSY)
326	&& (sts & LPS_NACK) == 0) return;
327	sc->sc_state \|= OBUSY; sc->sc_state &= ~ERROR;
328
329	if (sc->sc_xfercnt) {
330	/* send char */
331	/lprintf("%x ", sc->sc_cp); */
332	outb(port+lpt_data, *sc->sc_cp++) ; sc->sc_xfercnt-- ;
333	outb(port+lpt_control, sc->sc_control\|LPC_STB);
334	/* DELAY(X) */
335	outb(port+lpt_control, sc->sc_control);
336	}
337
338	/* any more bytes for the printer? */
339	if (sc->sc_xfercnt > 0) return;
340
341	/* none, wake up the top half to get more */
342	sc->sc_state &= ~OBUSY;
343	wakeup((caddr_t)sc);
344	lprintf("w ");
345	return;
346	} else sc->sc_state \|= ERROR;
347	lprintf("sts %x ", sts);
348	}
349
350	#endif NLP