File:  [DragonFly] / src / sys / dev / misc / lpt / lpt.c
Revision 1.8: download - view: text, annotated - select for diffs
Thu May 13 23:49:16 2004 UTC (10 years, 5 months ago) by dillon
Branches: MAIN
CVS tags: HEAD
device switch 1/many: Remove d_autoq, add d_clone (where d_autoq was).

d_autoq was used to allow the device port dispatch to mix old-style synchronous
calls with new style messaging calls within a particular device.  It was never
used for that purpose.

d_clone will be more fully implemented as work continues.  We are going to
install d_port in the dev_t (struct specinfo) structure itself and d_clone
will be needed to allow devices to 'revector' the port on a minor-number
by minor-number basis, in particular allowing minor numbers to be directly
dispatched to distinct threads.  This is something we will be needing later
on.

    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:  *	from: unknown origin, 386BSD 0.1
   49:  *	From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp
   50:  *	From Id: nlpt.c,v 1.14 1999/02/08 13:55:43 des Exp
   51:  * $FreeBSD: src/sys/dev/ppbus/lpt.c,v 1.15.2.3 2000/07/07 00:30:40 obrien Exp $
   52:  * $DragonFly: src/sys/dev/misc/lpt/lpt.c,v 1.8 2004/05/13 23:49:16 dillon Exp $
   53:  */
   54: 
   55: /*
   56:  * Device Driver for AT parallel printer port
   57:  * Written by William Jolitz 12/18/90
   58:  */
   59: 
   60: /*
   61:  * Updated for ppbus by Nicolas Souchu
   62:  * [Mon Jul 28 1997]
   63:  */
   64: 
   65: #include "opt_lpt.h"
   66: 
   67: #include <sys/param.h>
   68: #include <sys/systm.h>
   69: #include <sys/module.h>
   70: #include <sys/bus.h>
   71: #include <sys/conf.h>
   72: #include <sys/kernel.h>
   73: #include <sys/uio.h>
   74: #include <sys/syslog.h>
   75: #include <sys/malloc.h>
   76: 
   77: #include <machine/clock.h>
   78: #include <machine/bus.h>
   79: #include <machine/resource.h>
   80: #include <sys/rman.h>
   81: 
   82: #include "lptio.h"
   83: #include <bus/ppbus/ppbconf.h>
   84: #include <bus/ppbus/ppb_1284.h>
   85: #include "lpt.h"
   86: #include "ppbus_if.h"
   87: #include <bus/ppbus/ppbio.h>
   88: 
   89: MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers");
   90: 
   91: #ifndef LPT_DEBUG
   92: #define lprintf(args)
   93: #else
   94: #define lprintf(args)						\
   95: 		do {						\
   96: 			if (lptflag)				\
   97: 				printf args;			\
   98: 		} while (0)
   99: static int volatile lptflag = 1;
  100: #endif
  101: 
  102: #define	LPINITRDY	4	/* wait up to 4 seconds for a ready */
  103: #define	LPTOUTINITIAL	10	/* initial timeout to wait for ready 1/10 s */
  104: #define	LPTOUTMAX	1	/* maximal timeout 1 s */
  105: #define	BUFSIZE		1024
  106: #define	BUFSTATSIZE	32
  107: 
  108: #define	LPTUNIT(s)	((s)&0x03)
  109: #define	LPTFLAGS(s)	((s)&0xfc)
  110: 
  111: struct lpt_data {
  112: 
  113: 	short	sc_state;
  114: 	/* default case: negative prime, negative ack, handshake strobe,
  115: 	   prime once */
  116: 	u_char	sc_control;
  117: 	char	sc_flags;
  118: #define LP_POS_INIT	0x04	/* if we are a postive init signal */
  119: #define LP_POS_ACK	0x08	/* if we are a positive going ack */
  120: #define LP_NO_PRIME	0x10	/* don't prime the printer at all */
  121: #define LP_PRIMEOPEN	0x20	/* prime on every open */
  122: #define LP_AUTOLF	0x40	/* tell printer to do an automatic lf */
  123: #define LP_BYPASS	0x80	/* bypass  printer ready checks */
  124: 	void	*sc_inbuf;
  125: 	void	*sc_statbuf;
  126: 	short	sc_xfercnt ;
  127: 	char	sc_primed;
  128: 	char	*sc_cp ;
  129: 	u_short	sc_irq ;	/* IRQ status of port */
  130: #define LP_HAS_IRQ	0x01	/* we have an irq available */
  131: #define LP_USE_IRQ	0x02	/* we are using our irq */
  132: #define LP_ENABLE_IRQ	0x04	/* enable IRQ on open */
  133: #define LP_ENABLE_EXT	0x10	/* we shall use advanced mode when possible */
  134: 	u_char	sc_backoff ;	/* time to call lptout() again */
  135: 
  136: 	struct resource *intr_resource;	/* interrupt resource */
  137: 	void *intr_cookie;		/* interrupt registration cookie */
  138: 
  139: };
  140: 
  141: #define LPT_NAME	"lpt"		/* our official name */
  142: 
  143: static timeout_t lptout;
  144: static int	lpt_port_test(device_t dev, u_char data, u_char mask);
  145: static int	lpt_detect(device_t dev);
  146: 
  147: #define DEVTOSOFTC(dev) \
  148: 	((struct lpt_data *)device_get_softc(dev))
  149: #define UNITOSOFTC(unit) \
  150: 	((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit)))
  151: #define UNITODEVICE(unit) \
  152: 	(devclass_get_device(lpt_devclass, (unit)))
  153: 
  154: static void lptintr(device_t dev);
  155: static void lpt_intr(void *arg);	/* without spls */
  156: 
  157: static devclass_t lpt_devclass;
  158: 
  159: 
  160: /* bits for state */
  161: #define	OPEN		(1<<0)	/* device is open */
  162: #define	ASLP		(1<<1)	/* awaiting draining of printer */
  163: #define	EERROR		(1<<2)	/* error was received from printer */
  164: #define	OBUSY		(1<<3)	/* printer is busy doing output */
  165: #define LPTOUT		(1<<4)	/* timeout while not selected */
  166: #define TOUT		(1<<5)	/* timeout while not selected */
  167: #define LPTINIT		(1<<6)	/* waiting to initialize for open */
  168: #define INTERRUPTED	(1<<7)	/* write call was interrupted */
  169: 
  170: #define HAVEBUS		(1<<8)	/* the driver owns the bus */
  171: 
  172: 
  173: /* status masks to interrogate printer status */
  174: #define RDY_MASK	(LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)	/* ready ? */
  175: #define LP_READY	(LPS_SEL|LPS_NBSY|LPS_NERR)
  176: 
  177: /* Printer Ready condition  - from lpa.c */
  178: /* Only used in polling code */
  179: #define	LPS_INVERT	(LPS_NBSY | LPS_NACK |           LPS_SEL | LPS_NERR)
  180: #define	LPS_MASK	(LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
  181: #define	NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK)
  182: 
  183: #define	MAX_SLEEP	(hz*5)	/* Timeout while waiting for device ready */
  184: #define	MAX_SPIN	20	/* Max delay for device ready in usecs */
  185: 
  186: 
  187: static	d_open_t	lptopen;
  188: static	d_close_t	lptclose;
  189: static	d_write_t	lptwrite;
  190: static	d_read_t	lptread;
  191: static	d_ioctl_t	lptioctl;
  192: 
  193: #define CDEV_MAJOR 16
  194: static struct cdevsw lpt_cdevsw = {
  195: 	/* name */	LPT_NAME,
  196: 	/* maj */	CDEV_MAJOR,
  197: 	/* flags */	0,
  198: 	/* port */	NULL,
  199: 	/* clone */	NULL,
  200: 
  201: 	/* open */	lptopen,
  202: 	/* close */	lptclose,
  203: 	/* read */	lptread,
  204: 	/* write */	lptwrite,
  205: 	/* ioctl */	lptioctl,
  206: 	/* poll */	nopoll,
  207: 	/* mmap */	nommap,
  208: 	/* strategy */	nostrategy,
  209: 	/* dump */	nodump,
  210: 	/* psize */	nopsize
  211: };
  212: 
  213: static int
  214: lpt_request_ppbus(device_t dev, int how)
  215: {
  216: 	device_t ppbus = device_get_parent(dev);
  217: 	struct lpt_data *sc = DEVTOSOFTC(dev);
  218: 	int error;
  219: 
  220: 	if (sc->sc_state & HAVEBUS)
  221: 		return (0);
  222: 
  223: 	/* we have the bus only if the request succeded */
  224: 	if ((error = ppb_request_bus(ppbus, dev, how)) == 0)
  225: 		sc->sc_state |= HAVEBUS;
  226: 
  227: 	return (error);
  228: }
  229: 
  230: static int
  231: lpt_release_ppbus(device_t dev)
  232: {
  233: 	device_t ppbus = device_get_parent(dev);
  234: 	struct lpt_data *sc = DEVTOSOFTC(dev);
  235: 	int error = 0;
  236: 
  237: 	if ((error = ppb_release_bus(ppbus, dev)) == 0)
  238: 		sc->sc_state &= ~HAVEBUS;
  239: 
  240: 	return (error);
  241: }
  242: 
  243: /*
  244:  * Internal routine to lptprobe to do port tests of one byte value
  245:  */
  246: static int
  247: lpt_port_test(device_t ppbus, u_char data, u_char mask)
  248: {
  249: 	int	temp, timeout;
  250: 
  251: 	data = data & mask;
  252: 	ppb_wdtr(ppbus, data);
  253: 	timeout = 10000;
  254: 	do {
  255: 		DELAY(10);
  256: 		temp = ppb_rdtr(ppbus) & mask;
  257: 	}
  258: 	while (temp != data && --timeout);
  259: 	lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
  260: 	return (temp == data);
  261: }
  262: 
  263: /*
  264:  * Probe simplified by replacing multiple loops with a hardcoded
  265:  * test pattern - 1999/02/08 des@freebsd.org
  266:  *
  267:  * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
  268:  * Based partially on Rod Grimes' printer probe
  269:  *
  270:  * Logic:
  271:  *	1) If no port address was given, use the bios detected ports
  272:  *	   and autodetect what ports the printers are on.
  273:  *	2) Otherwise, probe the data port at the address given,
  274:  *	   using the method in Rod Grimes' port probe.
  275:  *	   (Much code ripped off directly from Rod's probe.)
  276:  *
  277:  * Comments from Rod's probe:
  278:  * Logic:
  279:  *	1) You should be able to write to and read back the same value
  280:  *	   to the data port.  Do an alternating zeros, alternating ones,
  281:  *	   walking zero, and walking one test to check for stuck bits.
  282:  *
  283:  *	2) You should be able to write to and read back the same value
  284:  *	   to the control port lower 5 bits, the upper 3 bits are reserved
  285:  *	   per the IBM PC technical reference manauls and different boards
  286:  *	   do different things with them.  Do an alternating zeros, alternating
  287:  *	   ones, walking zero, and walking one test to check for stuck bits.
  288:  *
  289:  *	   Some printers drag the strobe line down when the are powered off
  290:  * 	   so this bit has been masked out of the control port test.
  291:  *
  292:  *	   XXX Some printers may not like a fast pulse on init or strobe, I
  293:  *	   don't know at this point, if that becomes a problem these bits
  294:  *	   should be turned off in the mask byte for the control port test.
  295:  *
  296:  *	   We are finally left with a mask of 0x14, due to some printers
  297:  *	   being adamant about holding other bits high ........
  298:  *
  299:  *	   Before probing the control port, we write a 0 to the data port -
  300:  *	   If not, some printers chuck out garbage when the strobe line
  301:  *	   gets toggled.
  302:  *
  303:  *	3) Set the data and control ports to a value of 0
  304:  *
  305:  *	This probe routine has been tested on Epson Lx-800, HP LJ3P,
  306:  *	Epson FX-1170 and C.Itoh 8510RM
  307:  *	printers.
  308:  *	Quick exit on fail added.
  309:  */
  310: static int
  311: lpt_detect(device_t dev)
  312: {
  313: 	device_t ppbus = device_get_parent(dev);
  314: 
  315: 	static u_char	testbyte[18] = {
  316: 		0x55,			/* alternating zeros */
  317: 		0xaa,			/* alternating ones */
  318: 		0xfe, 0xfd, 0xfb, 0xf7,
  319: 		0xef, 0xdf, 0xbf, 0x7f,	/* walking zero */
  320: 		0x01, 0x02, 0x04, 0x08,
  321: 		0x10, 0x20, 0x40, 0x80	/* walking one */
  322: 	};
  323: 	int		i, error, status;
  324: 
  325: 	status = 1;				/* assume success */
  326: 
  327: 	if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
  328: 		printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
  329: 		status = 0;
  330: 		goto end_probe;
  331: 	}
  332: 
  333: 	for (i = 0; i < 18 && status; i++)
  334: 		if (!lpt_port_test(ppbus, testbyte[i], 0xff)) {
  335: 			status = 0;
  336: 			goto end_probe;
  337: 		}
  338: 
  339: end_probe:
  340: 	/* write 0's to control and data ports */
  341: 	ppb_wdtr(ppbus, 0);
  342: 	ppb_wctr(ppbus, 0);
  343: 
  344: 	lpt_release_ppbus(dev);
  345: 
  346: 	return (status);
  347: }
  348: 
  349: static void
  350: lpt_identify(driver_t *driver, device_t parent)
  351: {
  352: 
  353: 	BUS_ADD_CHILD(parent, 0, LPT_NAME, 0);
  354: }
  355: 
  356: /*
  357:  * lpt_probe()
  358:  */
  359: static int
  360: lpt_probe(device_t dev)
  361: {
  362: 	struct lpt_data *sc;
  363: 	
  364: 	sc = DEVTOSOFTC(dev);
  365: 	bzero(sc, sizeof(struct lpt_data));
  366: 
  367: 	/*
  368: 	 * Now, try to detect the printer.
  369: 	 */
  370: 	if (!lpt_detect(dev))
  371: 		return (ENXIO);
  372: 
  373: 	device_set_desc(dev, "Printer");
  374: 
  375: 	return (0);
  376: }
  377: 
  378: static int
  379: lpt_attach(device_t dev)
  380: {
  381: 	device_t ppbus = device_get_parent(dev);
  382: 	struct lpt_data *sc = DEVTOSOFTC(dev);
  383: 	int zero = 0, unit = device_get_unit(dev);
  384: 	int error;
  385: 	uintptr_t irq;
  386: 
  387: 	sc->sc_primed = 0;	/* not primed yet */
  388: 
  389: 	if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
  390: 		printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
  391: 		return (0);
  392: 	}
  393: 
  394: 	ppb_wctr(ppbus, LPC_NINIT);
  395: 
  396: 	/* check if we can use interrupt, should be done by ppc stuff */
  397: 	lprintf(("oldirq %x\n", sc->sc_irq));
  398: 
  399: 	/* retrieve the ppbus irq */
  400: 	BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq);
  401: 
  402: 	if (irq > 0) {
  403: 		/* declare our interrupt handler */
  404: 		sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
  405: 						       &zero, irq, irq, 1, RF_SHAREABLE);
  406: 	}
  407: 	if (sc->intr_resource) {
  408: 		sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
  409: 		device_printf(dev, "Interrupt-driven port\n");
  410: 	} else {
  411: 		sc->sc_irq = 0;
  412: 		device_printf(dev, "Polled port\n");
  413: 	}
  414: 	lprintf(("irq %x %x\n", irq, sc->sc_irq));
  415: 
  416: 	lpt_release_ppbus(dev);
  417: 
  418: 	make_dev(&lpt_cdevsw, unit,
  419: 	    UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit);
  420: 	make_dev(&lpt_cdevsw, unit | LP_BYPASS,
  421: 	    UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit);
  422: 	return (0);
  423: }
  424: 
  425: static void
  426: lptout(void *arg)
  427: {
  428: 	device_t dev = (device_t)arg;
  429: 	struct lpt_data *sc = DEVTOSOFTC(dev);
  430: #ifdef LPT_DEBUG
  431: 	device_t ppbus = device_get_parent(dev);
  432: #endif
  433: 
  434: 	lprintf(("T %x ", ppb_rstr(ppbus)));
  435: 	if (sc->sc_state & OPEN) {
  436: 		sc->sc_backoff++;
  437: 		if (sc->sc_backoff > hz/LPTOUTMAX)
  438: 			sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
  439: 		timeout(lptout, (caddr_t)dev, sc->sc_backoff);
  440: 	} else
  441: 		sc->sc_state &= ~TOUT;
  442: 
  443: 	if (sc->sc_state & EERROR)
  444: 		sc->sc_state &= ~EERROR;
  445: 
  446: 	/*
  447: 	 * Avoid possible hangs due to missed interrupts
  448: 	 */
  449: 	if (sc->sc_xfercnt) {
  450: 		lptintr(dev);
  451: 	} else {
  452: 		sc->sc_state &= ~OBUSY;
  453: 		wakeup((caddr_t)dev);
  454: 	}
  455: }
  456: 
  457: /*
  458:  * lptopen -- reset the printer, then wait until it's selected and not busy.
  459:  *	If LP_BYPASS flag is selected, then we do not try to select the
  460:  *	printer -- this is just used for passing ioctls.
  461:  */
  462: 
  463: static	int
  464: lptopen(dev_t dev, int flags, int fmt, struct thread *p)
  465: {
  466: 	int s;
  467: 	int trys, err;
  468: 	u_int unit = LPTUNIT(minor(dev));
  469: 	struct lpt_data *sc = UNITOSOFTC(unit);
  470: 	device_t lptdev = UNITODEVICE(unit);
  471: 	device_t ppbus = device_get_parent(lptdev);
  472: 
  473: 	if (!sc)
  474: 		return (ENXIO);
  475: 
  476: 	if (sc->sc_state) {
  477: 		lprintf((LPT_NAME ": still open %x\n", sc->sc_state));
  478: 		return(EBUSY);
  479: 	} else
  480: 		sc->sc_state |= LPTINIT;
  481: 
  482: 	sc->sc_flags = LPTFLAGS(minor(dev));
  483: 
  484: 	/* Check for open with BYPASS flag set. */
  485: 	if (sc->sc_flags & LP_BYPASS) {
  486: 		sc->sc_state = OPEN;
  487: 		return(0);
  488: 	}
  489: 
  490: 	/* request the ppbus only if we don't have it already */
  491: 	if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
  492: 		/* give it a chance to try later */
  493: 		sc->sc_state = 0;
  494: 		return (err);
  495: 	}
  496: 
  497: 	s = spltty();
  498: 	lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags));
  499: 
  500: 	/* set IRQ status according to ENABLE_IRQ flag
  501: 	 */
  502: 	if (sc->sc_irq & LP_ENABLE_IRQ)
  503: 		sc->sc_irq |= LP_USE_IRQ;
  504: 	else
  505: 		sc->sc_irq &= ~LP_USE_IRQ;
  506: 
  507: 	/* init printer */
  508: 	if ((sc->sc_flags & LP_NO_PRIME) == 0) {
  509: 		if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
  510: 			ppb_wctr(ppbus, 0);
  511: 			sc->sc_primed++;
  512: 			DELAY(500);
  513: 		}
  514: 	}
  515: 
  516: 	ppb_wctr(ppbus, LPC_SEL|LPC_NINIT);
  517: 
  518: 	/* wait till ready (printer running diagnostics) */
  519: 	trys = 0;
  520: 	do {
  521: 		/* ran out of waiting for the printer */
  522: 		if (trys++ >= LPINITRDY*4) {
  523: 			splx(s);
  524: 			sc->sc_state = 0;
  525: 			lprintf(("status %x\n", ppb_rstr(ppbus)));
  526: 
  527: 			lpt_release_ppbus(lptdev);
  528: 			return (EBUSY);
  529: 		}
  530: 
  531: 		/* wait 1/4 second, give up if we get a signal */
  532: 		if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) !=
  533: 		    EWOULDBLOCK) {
  534: 			sc->sc_state = 0;
  535: 			splx(s);
  536: 
  537: 			lpt_release_ppbus(lptdev);
  538: 			return (EBUSY);
  539: 		}
  540: 
  541: 		/* is printer online and ready for output */
  542: 	} while ((ppb_rstr(ppbus) &
  543: 			(LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
  544: 					(LPS_SEL|LPS_NBSY|LPS_NERR));
  545: 
  546: 	sc->sc_control = LPC_SEL|LPC_NINIT;
  547: 	if (sc->sc_flags & LP_AUTOLF)
  548: 		sc->sc_control |= LPC_AUTOL;
  549: 
  550: 	/* enable interrupt if interrupt-driven */
  551: 	if (sc->sc_irq & LP_USE_IRQ)
  552: 		sc->sc_control |= LPC_ENA;
  553: 
  554: 	ppb_wctr(ppbus, sc->sc_control);
  555: 
  556: 	sc->sc_state = OPEN;
  557: 	sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK);
  558: 	sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK);
  559: 	sc->sc_xfercnt = 0;
  560: 	splx(s);
  561: 
  562: 	/* release the ppbus */
  563: 	lpt_release_ppbus(lptdev);
  564: 
  565: 	/* only use timeout if using interrupt */
  566: 	lprintf(("irq %x\n", sc->sc_irq));
  567: 	if (sc->sc_irq & LP_USE_IRQ) {
  568: 		sc->sc_state |= TOUT;
  569: 		timeout(lptout, (caddr_t)lptdev,
  570: 			 (sc->sc_backoff = hz/LPTOUTINITIAL));
  571: 	}
  572: 
  573: 	lprintf(("opened.\n"));
  574: 	return(0);
  575: }
  576: 
  577: /*
  578:  * lptclose -- close the device, free the local line buffer.
  579:  *
  580:  * Check for interrupted write call added.
  581:  */
  582: 
  583: static	int
  584: lptclose(dev_t dev, int flags, int fmt, struct thread *p)
  585: {
  586: 	u_int unit = LPTUNIT(minor(dev));
  587: 	struct lpt_data *sc = UNITOSOFTC(unit);
  588: 	device_t lptdev = UNITODEVICE(unit);
  589:         device_t ppbus = device_get_parent(lptdev);
  590: 	int err;
  591: 
  592: 	if(sc->sc_flags & LP_BYPASS)
  593: 		goto end_close;
  594: 
  595: 	if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
  596: 		return (err);
  597: 
  598: 	sc->sc_state &= ~OPEN;
  599: 
  600: 	/* if the last write was interrupted, don't complete it */
  601: 	if((!(sc->sc_state  & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
  602: 		while ((ppb_rstr(ppbus) &
  603: 			(LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
  604: 			(LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
  605: 			/* wait 1/4 second, give up if we get a signal */
  606: 			if (tsleep((caddr_t)lptdev, PCATCH,
  607: 				"lpclose", hz) != EWOULDBLOCK)
  608: 				break;
  609: 
  610: 	ppb_wctr(ppbus, LPC_NINIT);
  611: 	free(sc->sc_inbuf, M_LPT);
  612: 	free(sc->sc_statbuf, M_LPT);
  613: 
  614: end_close:
  615: 	/* release the bus anyway
  616: 	 * unregistration of interrupt forced by release
  617: 	 */
  618: 	lpt_release_ppbus(lptdev);
  619: 
  620: 	sc->sc_state = 0;
  621: 	sc->sc_xfercnt = 0;
  622: 	lprintf(("closed.\n"));
  623: 	return(0);
  624: }
  625: 
  626: /*
  627:  * lpt_pushbytes()
  628:  *	Workhorse for actually spinning and writing bytes to printer
  629:  *	Derived from lpa.c
  630:  *	Originally by ?
  631:  *
  632:  *	This code is only used when we are polling the port
  633:  */
  634: static int
  635: lpt_pushbytes(device_t dev)
  636: {
  637: 	struct lpt_data *sc = DEVTOSOFTC(dev);
  638: 	device_t ppbus = device_get_parent(dev);
  639: 	int spin, err, tic;
  640: 	char ch;
  641: 
  642: 	lprintf(("p"));
  643: 	/* loop for every character .. */
  644: 	while (sc->sc_xfercnt > 0) {
  645: 		/* printer data */
  646: 		ch = *(sc->sc_cp);
  647: 		sc->sc_cp++;
  648: 		sc->sc_xfercnt--;
  649: 
  650: 		/*
  651: 		 * Wait for printer ready.
  652: 		 * Loop 20 usecs testing BUSY bit, then sleep
  653: 		 * for exponentially increasing timeout. (vak)
  654: 		 */
  655: 		for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin)
  656: 			DELAY(1);	/* XXX delay is NOT this accurate! */
  657: 		if (spin >= MAX_SPIN) {
  658: 			tic = 0;
  659: 			while (NOT_READY(ppbus)) {
  660: 				/*
  661: 				 * Now sleep, every cycle a
  662: 				 * little longer ..
  663: 				 */
  664: 				tic = tic + tic + 1;
  665: 				/*
  666: 				 * But no more than 10 seconds. (vak)
  667: 				 */
  668: 				if (tic > MAX_SLEEP)
  669: 					tic = MAX_SLEEP;
  670: 				err = tsleep((caddr_t)dev, 0,
  671: 					LPT_NAME "poll", tic);
  672: 				if (err != EWOULDBLOCK) {
  673: 					return (err);
  674: 				}
  675: 			}
  676: 		}
  677: 
  678: 		/* output data */
  679: 		ppb_wdtr(ppbus, ch);
  680: 		/* strobe */
  681: 		ppb_wctr(ppbus, sc->sc_control|LPC_STB);
  682: 		ppb_wctr(ppbus, sc->sc_control);
  683: 
  684: 	}
  685: 	return(0);
  686: }
  687: 
  688: /*
  689:  * lptread --retrieve printer status in IEEE1284 NIBBLE mode
  690:  */
  691: 
  692: static int
  693: lptread(dev_t dev, struct uio *uio, int ioflag)
  694: {
  695:         u_int	unit = LPTUNIT(minor(dev));
  696: 	struct lpt_data *sc = UNITOSOFTC(unit);
  697: 	device_t lptdev = UNITODEVICE(unit);
  698:         device_t ppbus = device_get_parent(lptdev);
  699: 	int error = 0, len;
  700: 
  701: 	if (sc->sc_flags & LP_BYPASS) {
  702: 		/* we can't do reads in bypass mode */
  703: 		return (EPERM);
  704: 	}
  705: 
  706: 	if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0)))
  707: 		return (error);
  708: 
  709: 	/* read data in an other buffer, read/write may be simultaneous */
  710: 	len = 0;
  711: 	while (uio->uio_resid) {
  712: 		if ((error = ppb_1284_read(ppbus, PPB_NIBBLE,
  713: 				sc->sc_statbuf, min(BUFSTATSIZE,
  714: 				uio->uio_resid), &len))) {
  715: 			goto error;
  716: 		}
  717: 
  718: 		if (!len)
  719: 			goto error;		/* no more data */
  720: 
  721: 		if ((error = uiomove(sc->sc_statbuf, len, uio)))
  722: 			goto error;
  723: 	}
  724: 
  725: error:
  726: 	ppb_1284_terminate(ppbus);
  727: 	return (error);
  728: }
  729: 
  730: /*
  731:  * lptwrite --copy a line from user space to a local buffer, then call
  732:  * putc to get the chars moved to the output queue.
  733:  *
  734:  * Flagging of interrupted write added.
  735:  */
  736: 
  737: static	int
  738: lptwrite(dev_t dev, struct uio *uio, int ioflag)
  739: {
  740: 	unsigned n;
  741: 	int err;
  742:         u_int	unit = LPTUNIT(minor(dev));
  743: 	struct lpt_data *sc = UNITOSOFTC(unit);
  744: 	device_t lptdev = UNITODEVICE(unit);
  745:         device_t ppbus = device_get_parent(lptdev);
  746: 
  747: 	if(sc->sc_flags & LP_BYPASS) {
  748: 		/* we can't do writes in bypass mode */
  749: 		return(EPERM);
  750: 	}
  751: 
  752: 	/* request the ppbus only if we don't have it already */
  753: 	/* XXX interrupt registration?! */
  754: 	if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
  755: 		return (err);
  756: 
  757: 	/* if interrupts are working, register the handler */
  758: 	if (sc->sc_irq & LP_USE_IRQ) {
  759: 		/* register our interrupt handler */
  760: 		err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource,
  761: 			       INTR_TYPE_TTY, lpt_intr, lptdev,
  762: 			       &sc->intr_cookie);
  763: 		if (err) {
  764: 			device_printf(lptdev, "handler registration failed, polled mode.\n");
  765: 			sc->sc_irq &= ~LP_USE_IRQ;
  766: 		}
  767: 	}
  768: 
  769: 	sc->sc_state &= ~INTERRUPTED;
  770: 	while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
  771: 		sc->sc_cp = sc->sc_inbuf;
  772: 		uiomove(sc->sc_cp, n, uio);
  773: 		sc->sc_xfercnt = n ;
  774: 
  775: 		if (sc->sc_irq & LP_ENABLE_EXT) {
  776: 			/* try any extended mode */
  777: 			err = ppb_write(ppbus, sc->sc_cp,
  778: 					sc->sc_xfercnt, 0);
  779: 			switch (err) {
  780: 			case 0:
  781: 				/* if not all data was sent, we could rely
  782: 				 * on polling for the last bytes */
  783: 				sc->sc_xfercnt = 0;
  784: 				break;
  785: 			case EINTR:
  786: 				sc->sc_state |= INTERRUPTED;	
  787: 				return(err);
  788: 			case EINVAL:
  789: 				/* advanced mode not avail */
  790: 				log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit);
  791: 				break;
  792: 			default:
  793: 				return(err);
  794: 			}
  795: 		} else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
  796: 			lprintf(("i"));
  797: 			/* if the printer is ready for a char, */
  798: 			/* give it one */
  799: 			if ((sc->sc_state & OBUSY) == 0){
  800: 				lprintf(("\nC %d. ", sc->sc_xfercnt));
  801: 				lptintr(lptdev);
  802: 			}
  803: 			lprintf(("W "));
  804: 			if (sc->sc_state & OBUSY)
  805: 				if ((err = tsleep((caddr_t)lptdev,
  806: 					 PCATCH, LPT_NAME "write", 0))) {
  807: 					sc->sc_state |= INTERRUPTED;
  808: 					return(err);
  809: 				}
  810: 		}
  811: 
  812: 		/* check to see if we must do a polled write */
  813: 		if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
  814: 			lprintf(("p"));
  815: 
  816: 			err = lpt_pushbytes(lptdev);
  817: 
  818: 			if (err)
  819: 				return(err);
  820: 		}
  821: 	}
  822: 
  823: 	/* we have not been interrupted, release the ppbus */
  824: 	lpt_release_ppbus(lptdev);
  825: 
  826: 	return(0);
  827: }
  828: 
  829: /*
  830:  * lpt_intr -- handle printer interrupts which occur when the printer is
  831:  * ready to accept another char.
  832:  *
  833:  * do checking for interrupted write call.
  834:  */
  835: 
  836: static void
  837: lpt_intr(void *arg)
  838: {
  839: 	device_t lptdev = (device_t)arg;
  840:         device_t ppbus = device_get_parent(lptdev);
  841: 	struct lpt_data *sc = DEVTOSOFTC(lptdev);
  842: 	int sts = 0;
  843: 	int i;
  844: 	
  845: 	/* we must own the bus to use it */
  846: 	if ((sc->sc_state & HAVEBUS) == 0)
  847: 		return;
  848: 
  849: 	/*
  850: 	 * Is printer online and ready for output?
  851: 	 *
  852: 	 * Avoid falling back to lptout() too quickly.  First spin-loop
  853: 	 * to see if the printer will become ready ``really soon now''.
  854: 	 */
  855: 	for (i = 0; i < 100 &&
  856: 	     ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ;
  857: 
  858: 	if ((sts & RDY_MASK) == LP_READY) {
  859: 		sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
  860: 		sc->sc_backoff = hz/LPTOUTINITIAL;
  861: 
  862: 		if (sc->sc_xfercnt) {
  863: 			/* send char */
  864: 			/*lprintf(("%x ", *sc->sc_cp)); */
  865: 			ppb_wdtr(ppbus, *sc->sc_cp++) ;
  866: 			ppb_wctr(ppbus, sc->sc_control|LPC_STB);
  867: 			/* DELAY(X) */
  868: 			ppb_wctr(ppbus, sc->sc_control);
  869: 
  870: 			/* any more data for printer */
  871: 			if(--(sc->sc_xfercnt) > 0) return;
  872: 		}
  873: 
  874: 		/*
  875: 		 * No more data waiting for printer.
  876: 		 * Wakeup is not done if write call was not interrupted.
  877: 		 */
  878: 		sc->sc_state &= ~OBUSY;
  879: 
  880: 		if(!(sc->sc_state & INTERRUPTED))
  881: 			wakeup((caddr_t)lptdev);
  882: 		lprintf(("w "));
  883: 		return;
  884: 	} else	{	/* check for error */
  885: 		if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
  886: 				(sc->sc_state & OPEN))
  887: 			sc->sc_state |= EERROR;
  888: 		/* lptout() will jump in and try to restart. */
  889: 	}
  890: 	lprintf(("sts %x ", sts));
  891: }
  892: 
  893: static void
  894: lptintr(device_t dev)
  895: {
  896: 	/* call the interrupt at required spl level */
  897: 	int s = spltty();
  898: 
  899: 	lpt_intr(dev);
  900: 
  901: 	splx(s);
  902: 	return;
  903: }
  904: 
  905: static	int
  906: lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *p)
  907: {
  908: 	int	error = 0;
  909:         u_int	unit = LPTUNIT(minor(dev));
  910:         struct	lpt_data *sc = UNITOSOFTC(unit);
  911: 	u_char	old_sc_irq;	/* old printer IRQ status */
  912: 
  913: 	switch (cmd) {
  914: 	case LPT_IRQ :
  915: 		if(sc->sc_irq & LP_HAS_IRQ) {
  916: 			/*
  917: 			 * NOTE:
  918: 			 * If the IRQ status is changed,
  919: 			 * this will only be visible on the
  920: 			 * next open.
  921: 			 *
  922: 			 * If interrupt status changes,
  923: 			 * this gets syslog'd.
  924: 			 */
  925: 			old_sc_irq = sc->sc_irq;
  926: 			switch(*(int*)data) {
  927: 			case 0:
  928: 				sc->sc_irq &= (~LP_ENABLE_IRQ);
  929: 				break;
  930: 			case 1:
  931: 				sc->sc_irq &= (~LP_ENABLE_EXT);
  932: 				sc->sc_irq |= LP_ENABLE_IRQ;
  933: 				break;
  934: 			case 2:
  935: 				/* classic irq based transfer and advanced
  936: 				 * modes are in conflict
  937: 				 */
  938: 				sc->sc_irq &= (~LP_ENABLE_IRQ);
  939: 				sc->sc_irq |= LP_ENABLE_EXT;
  940: 				break;
  941: 			case 3:
  942: 				sc->sc_irq &= (~LP_ENABLE_EXT);
  943: 				break;
  944: 			default:
  945: 				break;
  946: 			}
  947: 				
  948: 			if (old_sc_irq != sc->sc_irq )
  949: 				log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n",
  950: 					unit,
  951: 					(sc->sc_irq & LP_ENABLE_IRQ)?
  952: 					"interrupt-driven":"polled",
  953: 					(sc->sc_irq & LP_ENABLE_EXT)?
  954: 					"extended":"standard");
  955: 		} else /* polled port */
  956: 			error = EOPNOTSUPP;
  957: 		break;
  958: 	default:
  959: 		error = ENODEV;
  960: 	}
  961: 
  962: 	return(error);
  963: }
  964: 
  965: static device_method_t lpt_methods[] = {
  966: 	/* device interface */
  967: 	DEVMETHOD(device_identify,	lpt_identify),
  968: 	DEVMETHOD(device_probe,		lpt_probe),
  969: 	DEVMETHOD(device_attach,	lpt_attach),
  970: 
  971: 	{ 0, 0 }
  972: };
  973: 
  974: static driver_t lpt_driver = {
  975: 	LPT_NAME,
  976: 	lpt_methods,
  977: 	sizeof(struct lpt_data),
  978: };
  979: 
  980: DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0);