[unix-history] / sys / 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.
 *
 * PATCHES MAGIC                LEVEL   PATCH THAT GOT US HERE
 * --------------------         -----   ----------------------
 * CURRENT PATCH LEVEL:         2       00164
 * --------------------         -----   ----------------------
 *
 * 06 Apr 93	Eric Haug		Fixed comments and includes. [Ed: I did
 *					not include the unit-1 thing, that is a
 *					DOSism, fixed the config file instead]
 * 06 Apr 93	Rodney W. Grimes	A real probe routine, may even cause on
 *					interrupt if a printer is attached.
 *
 * 01 Jun 93	Rodney W. Grimes	Made lpflag uniq now is lptflag
 *					Added timeout loop to lpt_port_test.
 *					lpt_port_test should move to a common
 *					routine..
 *
 */

/*
 * Device Driver for AT parallel printer port
 * Written by William Jolitz 12/18/90
 */

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

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

#include "i386/isa/isa.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 (lptflag) printf
int lptflag = 1;
#endif

int lptout();
#ifdef DEBUG
int lptflag = 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 */

/*
 * Internal routine to lptprobe to do port tests of one byte value
 */
int
lpt_port_test(short port, u_char data, u_char mask)
	{
	int	temp, timeout;

	data = data & mask;
	outb(port, data);
	timeout = 100;
	do
		temp = inb(port) & mask;
	while (temp != data && --timeout);
	lprintf("Port 0x%x\tout=%x\tin=%x\n", port, data, temp);
	return (temp == data);
	}

/*
 * New lptprobe routine written by Rodney W. Grimes, 3/25/1993
 *
 * Logic:
 *	1) You should be able to write to and read back the same value
 *	   to the data port.  Do an alternating zeros, alternating ones,
 *	   walking zero, and walking one test to check for stuck bits.
 *
 *	2) You should be able to write to and read back the same value
 *	   to the control port lower 5 bits, the upper 3 bits are reserved
 *	   per the IBM PC technical reference manauls and different boards
 *	   do different things with them.  Do an alternating zeros, alternating
 *	   ones, walking zero, and walking one test to check for stuck bits.
 *
 *	   Some printers drag the strobe line down when the are powered off
 * 	   so this bit has been masked out of the control port test.
 *
 *	   XXX Some printers may not like a fast pulse on init or strobe, I
 *	   don't know at this point, if that becomes a problem these bits
 *	   should be turned off in the mask byte for the control port test.
 *
 *	3) Set the data and control ports to a value of 0
 */

int
lptprobe(struct isa_device *dvp)
	{
	int	status;
	short	port;
	u_char	data;
	u_char	mask;
	int	i;

	status = IO_LPTSIZE;

	port = dvp->id_iobase + lpt_data;
	mask = 0xff;
	while (mask != 0)
	{
		data = 0x55;				/* Alternating zeros */
		if (!lpt_port_test(port, data, mask)) status = 0;

		data = 0xaa;				/* Alternating ones */
		if (!lpt_port_test(port, data, mask)) status = 0;

		for (i = 0; i < 8; i++)			/* Walking zero */
			{
			data = ~(1 << i);
			if (!lpt_port_test(port, data, mask)) status = 0;
			}

		for (i = 0; i < 8; i++)			/* Walking one */
			{
			data = (1 << i);
			if (!lpt_port_test(port, data, mask)) status = 0;
			}

		if (port == dvp->id_iobase + lpt_data)
			{
			port = dvp->id_iobase + lpt_control;
			mask = 0x1e;
			}
		else
			mask = 0;
		}
	outb(dvp->id_iobase+lpt_data, 0);
	outb(dvp->id_iobase+lpt_control, 0);
	return (status);
	}

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);
}

int
lptioctl(dev_t dev, int cmd, caddr_t data, int flag)
{
	int	error;

	error = 0;
	switch (cmd) {
#ifdef THISISASAMPLE
	case XXX:
		dothis; andthis; andthat;
		error=x;
		break;
#endif /* THISISASAMPLE */
	default:
		error = ENODEV;
	}

	return(error);
}

#endif	/* NLPT */
Commit	Line	Data
15637ed4 RG	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	* PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
	49	* -------------------- ----- ----------------------
	50	* CURRENT PATCH LEVEL: 2 00164
	51	* -------------------- ----- ----------------------
	52	*
	53	* 06 Apr 93 Eric Haug Fixed comments and includes. [Ed: I did
	54	* not include the unit-1 thing, that is a
	55	* DOSism, fixed the config file instead]
	56	* 06 Apr 93 Rodney W. Grimes A real probe routine, may even cause on
	57	* interrupt if a printer is attached.
	58	*
	59	* 01 Jun 93 Rodney W. Grimes Made lpflag uniq now is lptflag
	60	* Added timeout loop to lpt_port_test.
	61	* lpt_port_test should move to a common
	62	* routine..
	63	*
	64	*/
65
66	/*
67	* Device Driver for AT parallel printer port
68	* Written by William Jolitz 12/18/90
69	*/
70
71	#include "lpt.h"
72	#if NLPT > 0
73
74	#include "param.h"
75	#include "systm.h"
76	#include "proc.h"
77	#include "user.h"
78	#include "buf.h"
79	#include "kernel.h"
80	#include "ioctl.h"
81	#include "tty.h"
82	#include "uio.h"
83
84	#include "i386/isa/isa.h"
85	#include "i386/isa/isa_device.h"
86	#include "i386/isa/lptreg.h"
87
88	#define LPINITRDY 4 /* wait up to 4 seconds for a ready */
89	#define LPTOUTTIME 4 /* wait up to 4 seconds for a ready */
90	#define LPPRI (PZERO+8)
91	#define BUFSIZE 1024
92
93	#ifndef DEBUG
94	#define lprintf
95	#else
96	#define lprintf if (lptflag) printf
97	int lptflag = 1;
98	#endif
99
100	int lptout();
101	#ifdef DEBUG
102	int lptflag = 1;
103	#endif
104
105	int lptprobe(), lptattach(), lptintr();
106
107	struct isa_driver lptdriver = {
108	lptprobe, lptattach, "lpt"
109	};
110
111	#define LPTUNIT(s) (((s)>>6)&0x3)
112	#define LPTFLAGS(s) ((s)&0x3f)
113
114	struct lpt_softc {
115	short sc_port;
116	short sc_state;
117	/* default case: negative prime, negative ack, handshake strobe,
118	prime once */
119	u_char sc_control;
120	char sc_flags;
121	#define LP_POS_INIT 0x01 /* if we are a postive init signal */
122	#define LP_POS_ACK 0x02 /* if we are a positive going ack */
123	#define LP_NO_PRIME 0x04 /* don't prime the printer at all */
124	#define LP_PRIMEOPEN 0x08 /* prime on every open */
125	#define LP_AUTOLF 0x10 /* tell printer to do an automatic lf */
126	#define LP_BYPASS 0x20 /* bypass printer ready checks */
127	struct buf *sc_inbuf;
128	short sc_xfercnt ;
129	char sc_primed;
130	char *sc_cp ;
131	} lpt_sc[NLPT] ;
132
133	/* bits for state */
134	#define OPEN (1<<0) /* device is open */
135	#define ASLP (1<<1) /* awaiting draining of printer */
136	#define ERROR (1<<2) /* error was received from printer */
137	#define OBUSY (1<<3) /* printer is busy doing output */
138	#define LPTOUT (1<<4) /* timeout while not selected */
139	#define TOUT (1<<5) /* timeout while not selected */
140	#define INIT (1<<6) /* waiting to initialize for open */
141
142	/*
143	* Internal routine to lptprobe to do port tests of one byte value
144	*/
145	int
146	lpt_port_test(short port, u_char data, u_char mask)
147	{
148	int temp, timeout;
149
150	data = data & mask;
151	outb(port, data);
152	timeout = 100;
153	do
154	temp = inb(port) & mask;
155	while (temp != data && --timeout);
156	lprintf("Port 0x%x\tout=%x\tin=%x\n", port, data, temp);
157	return (temp == data);
158	}
159
160	/*
161	* New lptprobe routine written by Rodney W. Grimes, 3/25/1993
162	*
163	* Logic:
164	* 1) You should be able to write to and read back the same value
165	* to the data port. Do an alternating zeros, alternating ones,
166	* walking zero, and walking one test to check for stuck bits.
167	*
168	* 2) You should be able to write to and read back the same value
169	* to the control port lower 5 bits, the upper 3 bits are reserved
170	* per the IBM PC technical reference manauls and different boards
171	* do different things with them. Do an alternating zeros, alternating
172	* ones, walking zero, and walking one test to check for stuck bits.
173	*
174	* Some printers drag the strobe line down when the are powered off
175	* so this bit has been masked out of the control port test.
176	*
177	* XXX Some printers may not like a fast pulse on init or strobe, I
178	* don't know at this point, if that becomes a problem these bits
179	* should be turned off in the mask byte for the control port test.
180	*
181	* 3) Set the data and control ports to a value of 0
182	*/
183
184	int
185	lptprobe(struct isa_device *dvp)
186	{
187	int status;
188	short port;
189	u_char data;
190	u_char mask;
191	int i;
192
193	status = IO_LPTSIZE;
194
195	port = dvp->id_iobase + lpt_data;
196	mask = 0xff;
197	while (mask != 0)
198	{
199	data = 0x55; /* Alternating zeros */
200	if (!lpt_port_test(port, data, mask)) status = 0;
201
202	data = 0xaa; /* Alternating ones */
203	if (!lpt_port_test(port, data, mask)) status = 0;
204
205	for (i = 0; i < 8; i++) /* Walking zero */
206	{
207	data = ~(1 << i);
208	if (!lpt_port_test(port, data, mask)) status = 0;
209	}
210
211	for (i = 0; i < 8; i++) /* Walking one */
212	{
213	data = (1 << i);
214	if (!lpt_port_test(port, data, mask)) status = 0;
215	}
216
217	if (port == dvp->id_iobase + lpt_data)
218	{
219	port = dvp->id_iobase + lpt_control;
220	mask = 0x1e;
221	}
222	else
223	mask = 0;
224	}
225	outb(dvp->id_iobase+lpt_data, 0);
226	outb(dvp->id_iobase+lpt_control, 0);
227	return (status);
228	}
229
230	lptattach(isdp)
231	struct isa_device *isdp;
232	{
233	struct lpt_softc *sc;
234
235	sc = lpt_sc + isdp->id_unit;
236	sc->sc_port = isdp->id_iobase;
237	outb(sc->sc_port+lpt_control, LPC_NINIT);
238	return (1);
239	}
240
241	/*
242	* lptopen -- reset the printer, then wait until it's selected and not busy.
243	*/
244
245	lptopen(dev, flag)
246	dev_t dev;
247	int flag;
248	{
249	struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
250	int s;
251	int trys, port;
252
253	if (sc->sc_state) {
254	lprintf("lp: still open\n") ;
255	printf("still open %x\n", sc->sc_state);
256	return(EBUSY);
257	} else sc->sc_state \|= INIT;
258
259	s = spltty();
260	sc->sc_flags = LPTFLAGS(minor(dev));
261	lprintf("lp flags 0x%x\n", sc->sc_flags);
262	port = sc->sc_port;
263
264	/* init printer */
265	if((sc->sc_flags & LP_NO_PRIME) == 0) {
266	if((sc->sc_flags & LP_PRIMEOPEN) \|\| sc->sc_primed == 0) {
267	outb(port+lpt_control, 0);
268	sc->sc_primed++;
269	DELAY(500);
270	}
271	}
272	outb(port+lpt_control, LPC_SEL\|LPC_NINIT);
273
274	/* wait till ready (printer running diagnostics) */
275	trys = 0;
276	do {
277	/* ran out of waiting for the printer */
278	if (trys++ >= LPINITRDY*4) {
279	splx(s);
280	sc->sc_state = 0;
281	printf ("status %x\n", inb(port+lpt_status) );
282	return (EBUSY);
283	}
284
285	/* wait 1/4 second, give up if we get a signal */
286	if (tsleep (sc, LPPRI\|PCATCH, "lptinit", hz/4) != EWOULDBLOCK) {
287	sc->sc_state = 0;
288	splx(s);
289	return (EBUSY);
290	}
291
292	/* is printer online and ready for output */
293	} while ((inb(port+lpt_status) & (LPS_SEL\|LPS_OUT\|LPS_NBSY\|LPS_NERR)) !=
294	(LPS_SEL\|LPS_NBSY\|LPS_NERR));
295
296	if(sc->sc_flags&LP_AUTOLF) {
297	outb(port+lpt_control, LPC_SEL\|LPC_NINIT\|LPC_ENA\|LPC_AUTOL);
298	sc->sc_control = LPC_SEL\|LPC_NINIT\|LPC_ENA\|LPC_AUTOL;
299	} else {
300	outb(port+lpt_control, LPC_SEL\|LPC_NINIT\|LPC_ENA);
301	sc->sc_control = LPC_SEL\|LPC_NINIT\|LPC_ENA;
302	}
303
304	sc->sc_state = OPEN \| TOUT;
305	sc->sc_inbuf = geteblk(BUFSIZE);
306	sc->sc_xfercnt = 0;
307	splx(s);
308	timeout (lptout, sc, hz/2);
309	lprintf("opened.\n");
310	return(0);
311	}
312
313	lptout (sc)
314	struct lpt_softc *sc;
315	{ int pl;
316
317	lprintf ("T %x ", inb(sc->sc_port+lpt_status));
318	if (sc->sc_state&OPEN)
319	timeout (lptout, sc, hz/2);
320	else sc->sc_state &= ~TOUT;
321
322	if (sc->sc_state & ERROR)
323	sc->sc_state &= ~ERROR;
324
325	/*
326	* Avoid possible hangs do to missed interrupts
327	*/
328	if (sc->sc_xfercnt) {
329	pl = spltty();
330	lptintr(sc - lpt_sc);
331	splx(pl);
332	} else {
333	sc->sc_state &= ~OBUSY;
334	wakeup((caddr_t)sc);
335	}
336	}
337
338	/*
339	* lptclose -- close the device, free the local line buffer.
340	*/
341
342	lptclose(dev, flag)
343	int flag;
344	{
345	struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
346	int port = sc->sc_port;
347
348	sc->sc_state &= ~OPEN;
349	while ((inb(port+lpt_status) & (LPS_SEL\|LPS_OUT\|LPS_NBSY\|LPS_NERR)) !=
350	(LPS_SEL\|LPS_NBSY\|LPS_NERR) \|\| sc->sc_xfercnt)
351	/* wait 1/4 second, give up if we get a signal */
352	if (tsleep (sc, LPPRI\|PCATCH, "lpclose", hz) != EWOULDBLOCK)
353	break;
354
355	sc->sc_state = 0;
356	sc->sc_xfercnt = 0;
357	outb(sc->sc_port+lpt_control, LPC_NINIT);
358	brelse(sc->sc_inbuf);
359	lprintf("closed.\n");
360	return(0);
361	}
362
363	/*
364	* lptwrite --copy a line from user space to a local buffer, then call
365	* putc to get the chars moved to the output queue.
366	*/
367
368	lptwrite(dev, uio)
369	dev_t dev;
370	struct uio *uio;
371	{
372	register unsigned n;
373	int pl, err;
374	struct lpt_softc *sc = lpt_sc + LPTUNIT(minor(dev));
375
376	while (n = MIN(BUFSIZE, uio->uio_resid)) {
377	sc->sc_cp = sc->sc_inbuf->b_un.b_addr ;
378	uiomove(sc->sc_cp, n, uio);
379	sc->sc_xfercnt = n ;
380	while (sc->sc_xfercnt > 0) {
381	/* if the printer is ready for a char, give it one */
382	if ((sc->sc_state & OBUSY) == 0){
383	lprintf("\nC %d. ", sc->sc_xfercnt);
384	pl = spltty();
385	lptintr(sc - lpt_sc);
386	(void) splx(pl);
387	}
388	lprintf("W ");
389	if (err = tsleep (sc, LPPRI\|PCATCH, "lpwrite", 0))
390	return(err);
391	}
392	}
393	return(0);
394	}
395
396	/*
397	* lptintr -- handle printer interrupts which occur when the printer is
398	* ready to accept another char.
399	*/
400
401	lptintr(unit)
402	{
403	struct lpt_softc *sc = lpt_sc + unit;
404	int port = sc->sc_port,sts;
405
406	/* is printer online and ready for output */
407	if (((sts=inb(port+lpt_status)) & (LPS_SEL\|LPS_OUT\|LPS_NBSY\|LPS_NERR/\|LPS_NACK/)) ==
408	(LPS_SEL\|LPS_NBSY\|LPS_NERR)) {
409	/* is this a false interrupt ? */
410	if ((sc->sc_state & OBUSY)
411	&& (sts & LPS_NACK) == 0) return;
412	sc->sc_state \|= OBUSY; sc->sc_state &= ~ERROR;
413
414	if (sc->sc_xfercnt) {
415	/* send char */
416	/lprintf("%x ", sc->sc_cp); */
417	outb(port+lpt_data, *sc->sc_cp++) ; sc->sc_xfercnt-- ;
418	outb(port+lpt_control, sc->sc_control\|LPC_STB);
419	/* DELAY(X) */
420	outb(port+lpt_control, sc->sc_control);
421	}
422
423	/* any more bytes for the printer? */
424	if (sc->sc_xfercnt > 0) return;
425
426	/* none, wake up the top half to get more */
427	sc->sc_state &= ~OBUSY;
428	wakeup((caddr_t)sc);
429	lprintf("w ");
430	return;
431	} else sc->sc_state \|= ERROR;
432	lprintf("sts %x ", sts);
433	}
434
435	int
436	lptioctl(dev_t dev, int cmd, caddr_t data, int flag)
437	{
438	int error;
439
440	error = 0;
441	switch (cmd) {
442	#ifdef THISISASAMPLE
443	case XXX:
444	dothis; andthis; andthat;
445	error=x;
446	break;
447	#endif /* THISISASAMPLE */
448	default:
449	error = ENODEV;
450	}
451
452	return(error);
453	}
454
455	#endif /* NLPT */