817 lines
20 KiB
C
817 lines
20 KiB
C
/*
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* Copyright (c) 1990 William F. Jolitz, TeleMuse
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This software is a component of "386BSD" developed by
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* William F. Jolitz, TeleMuse.
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* 4. Neither the name of the developer nor the name "386BSD"
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ
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* AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS
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* SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT.
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* THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT
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* NOT MAKE USE OF THIS WORK.
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*
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* FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED
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* BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN
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* REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES
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* (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING
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* JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND
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* LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE
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* ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS
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* OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992.
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*
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* THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* from: unknown origin, 386BSD 0.1
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* From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp
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* $Id: nlpt.c,v 1.5 1997/08/29 00:30:11 msmith Exp $
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*/
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/*
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* Device Driver for AT parallel printer port
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* Written by William Jolitz 12/18/90
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*/
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/*
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* Updated for ppbus by Nicolas Souchu
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* [Mon Jul 28 1997]
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*/
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#ifdef KERNEL
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/buf.h>
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#include <sys/kernel.h>
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#include <sys/uio.h>
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#include <sys/syslog.h>
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#ifdef DEVFS
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#include <sys/devfsext.h>
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#endif /*DEVFS*/
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#include <sys/malloc.h>
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#include <machine/clock.h>
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#include <machine/lpt.h>
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#endif /*KERNEL*/
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#include <dev/ppbus/ppbconf.h>
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#include <dev/ppbus/nlpt.h>
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#ifndef NLPT_DEBUG
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#define nlprintf (void)
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#else
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#define nlprintf if (nlptflag) printf
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static int volatile nlptflag = 1;
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#endif
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#define LPINITRDY 4 /* wait up to 4 seconds for a ready */
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#define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
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#define LPTOUTMAX 1 /* maximal timeout 1 s */
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#define LPPRI (PZERO+8)
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#define BUFSIZE 1024
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#define LPTUNIT(s) ((s)&0x03)
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#define LPTFLAGS(s) ((s)&0xfc)
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static int nlpt = 0;
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#define MAXLPT 8 /* XXX not much better! */
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static struct lpt_data *lptdata[MAXLPT];
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#define LPT_NAME "nlpt" /* our official name */
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static timeout_t nlptout;
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static int nlpt_port_test(struct lpt_data *sc, u_char data, u_char mask);
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static int nlpt_detect(struct lpt_data *sc);
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/*
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* Make ourselves visible as a ppbus driver
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*/
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static struct ppb_device *nlptprobe(struct ppb_data *ppb);
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static int nlptattach(struct ppb_device *dev);
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static void nlptintr(int unit);
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static void nlpt_drvinit(void *unused);
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#ifdef KERNEL
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static struct ppb_driver nlptdriver = {
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nlptprobe, nlptattach, LPT_NAME
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};
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DATA_SET(ppbdriver_set, nlptdriver);
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#endif /* KERNEL */
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/* bits for state */
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#define OPEN (1<<0) /* device is open */
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#define ASLP (1<<1) /* awaiting draining of printer */
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#define EERROR (1<<2) /* error was received from printer */
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#define OBUSY (1<<3) /* printer is busy doing output */
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#define LPTOUT (1<<4) /* timeout while not selected */
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#define TOUT (1<<5) /* timeout while not selected */
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#define INIT (1<<6) /* waiting to initialize for open */
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#define INTERRUPTED (1<<7) /* write call was interrupted */
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#define HAVEBUS (1<<8) /* the driver owns the bus */
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/* status masks to interrogate printer status */
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#define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
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#define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
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/* Printer Ready condition - from lpa.c */
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/* Only used in polling code */
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#define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
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#define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
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#define NOT_READY(lpt) ((ppb_rstr(&(lpt)->lpt_dev)^LPS_INVERT)&LPS_MASK)
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#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
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#define MAX_SPIN 20 /* Max delay for device ready in usecs */
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static d_open_t nlptopen;
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static d_close_t nlptclose;
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static d_write_t nlptwrite;
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static d_ioctl_t nlptioctl;
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#define CDEV_MAJOR 16
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static struct cdevsw nlpt_cdevsw =
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{ nlptopen, nlptclose, noread, nlptwrite, /*16*/
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nlptioctl, nullstop, nullreset, nodevtotty, /* lpt */
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seltrue, nommap, nostrat, LPT_NAME, NULL, -1 };
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static int
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lpt_request_ppbus(struct lpt_data *sc, int how)
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{
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sc->sc_state |= HAVEBUS;
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return (ppb_request_bus(&sc->lpt_dev, how));
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}
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static int
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lpt_release_ppbus(struct lpt_data *sc)
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{
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sc->sc_state &= ~HAVEBUS;
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return (ppb_release_bus(&sc->lpt_dev));
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}
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/*
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* Internal routine to nlptprobe to do port tests of one byte value
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*/
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static int
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nlpt_port_test(struct lpt_data *sc, u_char data, u_char mask)
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{
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int temp, timeout;
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data = data & mask;
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ppb_wdtr(&sc->lpt_dev, data);
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timeout = 10000;
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do {
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DELAY(10);
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temp = ppb_rdtr(&sc->lpt_dev) & mask;
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}
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while (temp != data && --timeout);
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nlprintf("out=%x\tin=%x\ttout=%d\n", data, temp, timeout);
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return (temp == data);
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}
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/*
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* New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
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* Based partially on Rod Grimes' printer probe
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*
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* Logic:
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* 1) If no port address was given, use the bios detected ports
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* and autodetect what ports the printers are on.
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* 2) Otherwise, probe the data port at the address given,
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* using the method in Rod Grimes' port probe.
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* (Much code ripped off directly from Rod's probe.)
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*
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* Comments from Rod's probe:
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* Logic:
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* 1) You should be able to write to and read back the same value
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* to the data port. Do an alternating zeros, alternating ones,
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* walking zero, and walking one test to check for stuck bits.
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*
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* 2) You should be able to write to and read back the same value
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* to the control port lower 5 bits, the upper 3 bits are reserved
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* per the IBM PC technical reference manauls and different boards
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* do different things with them. Do an alternating zeros, alternating
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* ones, walking zero, and walking one test to check for stuck bits.
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*
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* Some printers drag the strobe line down when the are powered off
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* so this bit has been masked out of the control port test.
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*
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* XXX Some printers may not like a fast pulse on init or strobe, I
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* don't know at this point, if that becomes a problem these bits
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* should be turned off in the mask byte for the control port test.
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*
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* We are finally left with a mask of 0x14, due to some printers
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* being adamant about holding other bits high ........
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*
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* Before probing the control port, we write a 0 to the data port -
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* If not, some printers chuck out garbage when the strobe line
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* gets toggled.
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*
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* 3) Set the data and control ports to a value of 0
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*
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* This probe routine has been tested on Epson Lx-800, HP LJ3P,
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* Epson FX-1170 and C.Itoh 8510RM
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* printers.
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* Quick exit on fail added.
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*/
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static int
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nlpt_detect(struct lpt_data *sc)
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{
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int status;
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u_char data;
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u_char mask;
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int i, error;
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status = 1; /* assume success */
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if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) {
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printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
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status = 0 ; goto end_probe ;
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}
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mask = 0xff;
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data = 0x55; /* Alternating zeros */
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if (!nlpt_port_test(sc, data, mask))
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{ status = 0 ; goto end_probe ; }
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data = 0xaa; /* Alternating ones */
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if (!nlpt_port_test(sc, data, mask))
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{ status = 0 ; goto end_probe ; }
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for (i = 0; i < 8; i++) { /* Walking zero */
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data = ~(1 << i);
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if (!nlpt_port_test(sc, data, mask))
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{ status = 0 ; goto end_probe ; }
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}
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for (i = 0; i < 8; i++) { /* Walking one */
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data = (1 << i);
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if (!nlpt_port_test(sc, data, mask))
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{ status = 0 ; goto end_probe ; }
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}
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end_probe:
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/* write 0's to control and data ports */
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ppb_wdtr(&sc->lpt_dev, 0);
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ppb_wctr(&sc->lpt_dev, 0);
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lpt_release_ppbus(sc);
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return (status);
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}
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/*
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* nlptprobe()
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*/
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static struct ppb_device *
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nlptprobe(struct ppb_data *ppb)
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{
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struct lpt_data *sc;
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sc = (struct lpt_data *) malloc(sizeof(struct lpt_data),
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M_TEMP, M_NOWAIT);
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if (!sc) {
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printf(LPT_NAME ": cannot malloc!\n");
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return (0);
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}
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bzero(sc, sizeof(struct lpt_data));
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lptdata[nlpt] = sc;
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/*
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* lpt dependent initialisation.
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*/
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sc->lpt_unit = nlpt;
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/*
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* ppbus dependent initialisation.
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*/
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sc->lpt_dev.id_unit = sc->lpt_unit;
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sc->lpt_dev.ppb = ppb;
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sc->lpt_dev.intr = nlptintr;
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/*
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* Now, try to detect the printer.
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*/
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if (!nlpt_detect(sc)) {
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free(sc, M_TEMP);
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return (0);
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}
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/* Ok, go to next device on next probe */
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nlpt ++;
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return (&sc->lpt_dev);
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}
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static int
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nlptattach(struct ppb_device *dev)
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{
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struct lpt_data *sc = lptdata[dev->id_unit];
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int error;
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/*
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* Report ourselves
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*/
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printf(LPT_NAME "%d: <generic printer> on ppbus %d\n",
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dev->id_unit, dev->ppb->ppb_link->adapter_unit);
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sc->sc_primed = 0; /* not primed yet */
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if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) {
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printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
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return (0);
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}
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ppb_wctr(&sc->lpt_dev, LPC_NINIT);
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/* check if we can use interrupt, should be done by ppc stuff */
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nlprintf("oldirq %x\n", sc->sc_irq);
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if (ppb_get_irq(&sc->lpt_dev)) {
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sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
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printf(LPT_NAME "%d: Interrupt-driven port\n", dev->id_unit);
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} else {
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sc->sc_irq = 0;
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nlprintf(LPT_NAME "%d: Polled port\n", dev->id_unit);
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}
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nlprintf("irq %x\n", sc->sc_irq);
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lpt_release_ppbus(sc);
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#ifdef DEVFS
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sc->devfs_token = devfs_add_devswf(&nlpt_cdevsw,
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dev->id_unit, DV_CHR,
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UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", dev->id_unit);
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sc->devfs_token_ctl = devfs_add_devswf(&nlpt_cdevsw,
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dev->id_unit | LP_BYPASS, DV_CHR,
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UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", dev->id_unit);
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#endif
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return (1);
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}
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static void
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nlptout(void *arg)
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{
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struct lpt_data *sc = arg;
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int pl;
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nlprintf ("T %x ", ppb_rstr(&sc->lpt_dev));
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if (sc->sc_state & OPEN) {
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sc->sc_backoff++;
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if (sc->sc_backoff > hz/LPTOUTMAX)
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sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
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timeout(nlptout, (caddr_t)sc, sc->sc_backoff);
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} else
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sc->sc_state &= ~TOUT;
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if (sc->sc_state & EERROR)
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sc->sc_state &= ~EERROR;
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/*
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* Avoid possible hangs do to missed interrupts
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*/
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if (sc->sc_xfercnt) {
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/* if we cannot allocate the bus NOW, retry later */
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if ((sc->sc_state & HAVEBUS) == 0 &&
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lpt_request_ppbus (sc, PPB_DONTWAIT)) {
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sc->sc_backoff++;
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if (sc->sc_backoff > hz/LPTOUTMAX)
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sc->sc_backoff =
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sc->sc_backoff > hz/LPTOUTMAX;
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timeout(nlptout, (caddr_t)sc,
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sc->sc_backoff);
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return;
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}
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pl = spltty();
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nlptintr(sc->lpt_unit);
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splx(pl);
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} else {
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sc->sc_state &= ~OBUSY;
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wakeup((caddr_t)sc);
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}
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}
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/*
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* nlptopen -- reset the printer, then wait until it's selected and not busy.
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* If LP_BYPASS flag is selected, then we do not try to select the
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* printer -- this is just used for passing ioctls.
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*/
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static int
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nlptopen(dev_t dev, int flags, int fmt, struct proc *p)
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{
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struct lpt_data *sc;
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int s;
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int trys;
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u_int unit = LPTUNIT(minor(dev));
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if ((unit >= nlpt))
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return (ENXIO);
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sc = lptdata[unit];
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if (sc->sc_state) {
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nlprintf(LPT_NAME ": still open %x\n", sc->sc_state);
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return(EBUSY);
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} else
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sc->sc_state |= INIT;
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sc->sc_flags = LPTFLAGS(minor(dev));
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/* Check for open with BYPASS flag set. */
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if (sc->sc_flags & LP_BYPASS) {
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sc->sc_state = OPEN;
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return(0);
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}
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if (lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR))
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return (EINTR);
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s = spltty();
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nlprintf(LPT_NAME " flags 0x%x\n", sc->sc_flags);
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/* set IRQ status according to ENABLE_IRQ flag */
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if (sc->sc_irq & LP_ENABLE_IRQ)
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sc->sc_irq |= LP_USE_IRQ;
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else
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sc->sc_irq &= ~LP_USE_IRQ;
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/* init printer */
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if ((sc->sc_flags & LP_NO_PRIME) == 0) {
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if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
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ppb_wctr(&sc->lpt_dev, 0);
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sc->sc_primed++;
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DELAY(500);
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}
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}
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ppb_wctr(&sc->lpt_dev, LPC_SEL|LPC_NINIT);
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/* wait till ready (printer running diagnostics) */
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trys = 0;
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do {
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/* ran out of waiting for the printer */
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if (trys++ >= LPINITRDY*4) {
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splx(s);
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sc->sc_state = 0;
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nlprintf ("status %x\n", ppb_rstr(&sc->lpt_dev) );
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lpt_release_ppbus(sc);
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return (EBUSY);
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}
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/* wait 1/4 second, give up if we get a signal */
|
|
if (tsleep((caddr_t)sc, LPPRI|PCATCH, "lptinit", hz/4) !=
|
|
EWOULDBLOCK) {
|
|
sc->sc_state = 0;
|
|
splx(s);
|
|
|
|
lpt_release_ppbus(sc);
|
|
return (EBUSY);
|
|
}
|
|
|
|
/* is printer online and ready for output */
|
|
} while ((ppb_rstr(&sc->lpt_dev) &
|
|
(LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
|
|
(LPS_SEL|LPS_NBSY|LPS_NERR));
|
|
|
|
sc->sc_control = LPC_SEL|LPC_NINIT;
|
|
if (sc->sc_flags & LP_AUTOLF)
|
|
sc->sc_control |= LPC_AUTOL;
|
|
|
|
/* enable interrupt if interrupt-driven */
|
|
if (sc->sc_irq & LP_USE_IRQ)
|
|
sc->sc_control |= LPC_ENA;
|
|
|
|
ppb_wctr(&sc->lpt_dev, sc->sc_control);
|
|
|
|
sc->sc_state = OPEN;
|
|
sc->sc_inbuf = geteblk(BUFSIZE);
|
|
sc->sc_xfercnt = 0;
|
|
splx(s);
|
|
|
|
/* release the bus, nlptout() will try to allocate it later */
|
|
lpt_release_ppbus(sc);
|
|
|
|
/* only use timeout if using interrupt */
|
|
nlprintf("irq %x\n", sc->sc_irq);
|
|
if (sc->sc_irq & LP_USE_IRQ) {
|
|
sc->sc_state |= TOUT;
|
|
timeout(nlptout, (caddr_t)sc,
|
|
(sc->sc_backoff = hz/LPTOUTINITIAL));
|
|
}
|
|
|
|
nlprintf("opened.\n");
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* nlptclose -- close the device, free the local line buffer.
|
|
*
|
|
* Check for interrupted write call added.
|
|
*/
|
|
|
|
static int
|
|
nlptclose(dev_t dev, int flags, int fmt, struct proc *p)
|
|
{
|
|
struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))];
|
|
int err;
|
|
|
|
if(sc->sc_flags & LP_BYPASS)
|
|
goto end_close;
|
|
|
|
if ((sc->sc_state & HAVEBUS) == 0 &&
|
|
(err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)))
|
|
return (err);
|
|
|
|
sc->sc_state &= ~OPEN;
|
|
|
|
/* if the last write was interrupted, don't complete it */
|
|
if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
|
|
while ((ppb_rstr(&sc->lpt_dev) &
|
|
(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((caddr_t)sc, LPPRI|PCATCH,
|
|
"lpclose", hz) != EWOULDBLOCK)
|
|
break;
|
|
|
|
ppb_wctr(&sc->lpt_dev, LPC_NINIT);
|
|
brelse(sc->sc_inbuf);
|
|
|
|
lpt_release_ppbus(sc);
|
|
|
|
end_close:
|
|
sc->sc_state = 0;
|
|
sc->sc_xfercnt = 0;
|
|
nlprintf("closed.\n");
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* nlpt_pushbytes()
|
|
* Workhorse for actually spinning and writing bytes to printer
|
|
* Derived from lpa.c
|
|
* Originally by ?
|
|
*
|
|
* This code is only used when we are polling the port
|
|
*/
|
|
static int
|
|
nlpt_pushbytes(struct lpt_data *sc)
|
|
{
|
|
int spin, err, tic;
|
|
char ch;
|
|
|
|
nlprintf("p");
|
|
/* loop for every character .. */
|
|
while (sc->sc_xfercnt > 0) {
|
|
/* printer data */
|
|
ch = *(sc->sc_cp);
|
|
sc->sc_cp++;
|
|
sc->sc_xfercnt--;
|
|
|
|
/*
|
|
* Wait for printer ready.
|
|
* Loop 20 usecs testing BUSY bit, then sleep
|
|
* for exponentially increasing timeout. (vak)
|
|
*/
|
|
for (spin = 0; NOT_READY(sc) && spin < MAX_SPIN; ++spin)
|
|
DELAY(1); /* XXX delay is NOT this accurate! */
|
|
if (spin >= MAX_SPIN) {
|
|
tic = 0;
|
|
while (NOT_READY(sc)) {
|
|
/*
|
|
* Now sleep, every cycle a
|
|
* little longer ..
|
|
*/
|
|
tic = tic + tic + 1;
|
|
/*
|
|
* But no more than 10 seconds. (vak)
|
|
*/
|
|
if (tic > MAX_SLEEP)
|
|
tic = MAX_SLEEP;
|
|
err = tsleep((caddr_t)sc, LPPRI,
|
|
LPT_NAME "poll", tic);
|
|
if (err != EWOULDBLOCK) {
|
|
return (err);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* output data */
|
|
ppb_wdtr(&sc->lpt_dev, ch);
|
|
/* strobe */
|
|
ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB);
|
|
ppb_wctr(&sc->lpt_dev, sc->sc_control);
|
|
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* nlptwrite --copy a line from user space to a local buffer, then call
|
|
* putc to get the chars moved to the output queue.
|
|
*
|
|
* Flagging of interrupted write added.
|
|
*/
|
|
|
|
static int
|
|
nlptwrite(dev_t dev, struct uio *uio, int ioflag)
|
|
{
|
|
register unsigned n;
|
|
int pl, err;
|
|
struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))];
|
|
|
|
if(sc->sc_flags & LP_BYPASS) {
|
|
/* we can't do writes in bypass mode */
|
|
return(EPERM);
|
|
}
|
|
|
|
if (lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR))
|
|
return (EINTR);
|
|
|
|
sc->sc_state &= ~INTERRUPTED;
|
|
while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
|
|
sc->sc_cp = sc->sc_inbuf->b_data ;
|
|
uiomove(sc->sc_cp, n, uio);
|
|
sc->sc_xfercnt = n ;
|
|
while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
|
|
nlprintf("i");
|
|
/* if the printer is ready for a char, */
|
|
/* give it one */
|
|
if ((sc->sc_state & OBUSY) == 0){
|
|
nlprintf("\nC %d. ", sc->sc_xfercnt);
|
|
pl = spltty();
|
|
nlptintr(sc->lpt_unit);
|
|
(void) splx(pl);
|
|
}
|
|
nlprintf("W ");
|
|
if (sc->sc_state & OBUSY)
|
|
if ((err = tsleep((caddr_t)sc,
|
|
LPPRI|PCATCH, LPT_NAME "write", 0))) {
|
|
sc->sc_state |= INTERRUPTED;
|
|
return(err);
|
|
}
|
|
}
|
|
/* check to see if we must do a polled write */
|
|
if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
|
|
nlprintf("p");
|
|
|
|
err = nlpt_pushbytes(sc);
|
|
lpt_release_ppbus(sc);
|
|
|
|
if (err)
|
|
return(err);
|
|
}
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* nlptintr -- handle printer interrupts which occur when the printer is
|
|
* ready to accept another char.
|
|
*
|
|
* do checking for interrupted write call.
|
|
*/
|
|
|
|
static void
|
|
nlptintr(int unit)
|
|
{
|
|
struct lpt_data *sc = lptdata[unit];
|
|
int sts;
|
|
int i;
|
|
|
|
/*
|
|
* Is printer online and ready for output?
|
|
*
|
|
* Avoid falling back to nlptout() too quickly. First spin-loop
|
|
* to see if the printer will become ready ``really soon now''.
|
|
*/
|
|
for (i = 0; i < 100 &&
|
|
((sts=ppb_rstr(&sc->lpt_dev)) & RDY_MASK) != LP_READY; i++) ;
|
|
|
|
if ((sts & RDY_MASK) == LP_READY) {
|
|
sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
|
|
sc->sc_backoff = hz/LPTOUTINITIAL;
|
|
|
|
if (sc->sc_xfercnt) {
|
|
/* send char */
|
|
/*nlprintf("%x ", *sc->sc_cp); */
|
|
ppb_wdtr(&sc->lpt_dev, *sc->sc_cp++) ;
|
|
ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB);
|
|
/* DELAY(X) */
|
|
ppb_wctr(&sc->lpt_dev, sc->sc_control);
|
|
|
|
/* any more data for printer */
|
|
if(--(sc->sc_xfercnt) > 0) return;
|
|
}
|
|
|
|
/*
|
|
* No more data waiting for printer.
|
|
* Wakeup is not done if write call was interrupted.
|
|
*/
|
|
sc->sc_state &= ~OBUSY;
|
|
lpt_release_ppbus(sc);
|
|
|
|
if(!(sc->sc_state & INTERRUPTED))
|
|
wakeup((caddr_t)sc);
|
|
nlprintf("w ");
|
|
return;
|
|
} else { /* check for error */
|
|
if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
|
|
(sc->sc_state & OPEN))
|
|
sc->sc_state |= EERROR;
|
|
/* nlptout() will jump in and try to restart. */
|
|
}
|
|
nlprintf("sts %x ", sts);
|
|
}
|
|
|
|
static int
|
|
nlptioctl(dev_t dev, int cmd, caddr_t data, int flags, struct proc *p)
|
|
{
|
|
int error = 0;
|
|
struct lpt_data *sc;
|
|
u_int unit = LPTUNIT(minor(dev));
|
|
u_char old_sc_irq; /* old printer IRQ status */
|
|
|
|
sc = lptdata[unit];
|
|
|
|
switch (cmd) {
|
|
case LPT_IRQ :
|
|
if(sc->sc_irq & LP_HAS_IRQ) {
|
|
/*
|
|
* NOTE:
|
|
* If the IRQ status is changed,
|
|
* this will only be visible on the
|
|
* next open.
|
|
*
|
|
* If interrupt status changes,
|
|
* this gets syslog'd.
|
|
*/
|
|
old_sc_irq = sc->sc_irq;
|
|
if(*(int*)data == 0)
|
|
sc->sc_irq &= (~LP_ENABLE_IRQ);
|
|
else
|
|
sc->sc_irq |= LP_ENABLE_IRQ;
|
|
if (old_sc_irq != sc->sc_irq )
|
|
log(LOG_NOTICE, LPT_NAME "%d: switched to %s mode\n",
|
|
unit,
|
|
(sc->sc_irq & LP_ENABLE_IRQ)?
|
|
"interrupt-driven":"polled");
|
|
} else /* polled port */
|
|
error = EOPNOTSUPP;
|
|
break;
|
|
default:
|
|
error = ENODEV;
|
|
}
|
|
|
|
return(error);
|
|
}
|
|
|
|
static nlpt_devsw_installed = 0;
|
|
|
|
static void
|
|
nlpt_drvinit(void *unused)
|
|
{
|
|
dev_t dev;
|
|
|
|
if( ! nlpt_devsw_installed ) {
|
|
dev = makedev(CDEV_MAJOR, 0);
|
|
cdevsw_add(&dev,&nlpt_cdevsw, NULL);
|
|
nlpt_devsw_installed = 1;
|
|
}
|
|
}
|
|
|
|
SYSINIT(nlptdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,nlpt_drvinit,NULL)
|