2 * Copyright (c) 1990 William F. Jolitz, TeleMuse
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
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.
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
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
55 * Device Driver for AT parallel printer port
56 * Written by William Jolitz 12/18/90
60 * Updated for ppbus by Nicolas Souchu
67 #include <sys/param.h>
68 #include <sys/systm.h>
71 #include <sys/kernel.h>
73 #include <sys/syslog.h>
74 #include <sys/malloc.h>
76 #include <machine/clock.h>
77 #include <machine/lpt.h>
80 #include <dev/ppbus/ppbconf.h>
81 #include <dev/ppbus/ppb_1284.h>
82 #include <dev/ppbus/lpt.h>
89 #define lprintf(args) \
94 static int volatile lptflag = 1;
97 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */
98 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
99 #define LPTOUTMAX 1 /* maximal timeout 1 s */
100 #define LPPRI (PZERO+8)
102 #define BUFSTATSIZE 32
104 #define LPTUNIT(s) ((s)&0x03)
105 #define LPTFLAGS(s) ((s)&0xfc)
108 unsigned short lpt_unit;
110 struct ppb_device lpt_dev;
113 /* default case: negative prime, negative ack, handshake strobe,
117 #define LP_POS_INIT 0x04 /* if we are a postive init signal */
118 #define LP_POS_ACK 0x08 /* if we are a positive going ack */
119 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */
120 #define LP_PRIMEOPEN 0x20 /* prime on every open */
121 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */
122 #define LP_BYPASS 0x80 /* bypass printer ready checks */
123 struct buf *sc_inbuf;
124 struct buf *sc_statbuf;
128 u_short sc_irq ; /* IRQ status of port */
129 #define LP_HAS_IRQ 0x01 /* we have an irq available */
130 #define LP_USE_IRQ 0x02 /* we are using our irq */
131 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */
132 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */
133 u_char sc_backoff ; /* time to call lptout() again */
138 #define MAXLPT 8 /* XXX not much better! */
139 static struct lpt_data *lptdata[MAXLPT];
141 #define LPT_NAME "lpt" /* our official name */
143 static timeout_t lptout;
144 static int lpt_port_test(struct lpt_data *sc, u_char data, u_char mask);
145 static int lpt_detect(struct lpt_data *sc);
148 * Make ourselves visible as a ppbus driver
151 static struct ppb_device *lptprobe(struct ppb_data *ppb);
152 static int lptattach(struct ppb_device *dev);
153 static void lptintr(int unit);
155 static void lpt_intr(int unit); /* without spls */
159 static struct ppb_driver lptdriver = {
160 lptprobe, lptattach, LPT_NAME
162 DATA_SET(ppbdriver_set, lptdriver);
167 #define OPEN (1<<0) /* device is open */
168 #define ASLP (1<<1) /* awaiting draining of printer */
169 #define EERROR (1<<2) /* error was received from printer */
170 #define OBUSY (1<<3) /* printer is busy doing output */
171 #define LPTOUT (1<<4) /* timeout while not selected */
172 #define TOUT (1<<5) /* timeout while not selected */
173 #define LPTINIT (1<<6) /* waiting to initialize for open */
174 #define INTERRUPTED (1<<7) /* write call was interrupted */
176 #define HAVEBUS (1<<8) /* the driver owns the bus */
179 /* status masks to interrogate printer status */
180 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
181 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
183 /* Printer Ready condition - from lpa.c */
184 /* Only used in polling code */
185 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
186 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
187 #define NOT_READY(lpt) ((ppb_rstr(&(lpt)->lpt_dev)^LPS_INVERT)&LPS_MASK)
189 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
190 #define MAX_SPIN 20 /* Max delay for device ready in usecs */
193 static d_open_t lptopen;
194 static d_close_t lptclose;
195 static d_write_t lptwrite;
196 static d_read_t lptread;
197 static d_ioctl_t lptioctl;
199 #define CDEV_MAJOR 16
200 static struct cdevsw lpt_cdevsw = {
202 /* close */ lptclose,
204 /* write */ lptwrite,
205 /* ioctl */ lptioctl,
208 /* strategy */ nostrategy,
210 /* maj */ CDEV_MAJOR,
218 lpt_request_ppbus(struct lpt_data *sc, int how)
222 if (sc->sc_state & HAVEBUS)
225 /* we have the bus only if the request succeded */
226 if ((error = ppb_request_bus(&sc->lpt_dev, how)) == 0)
227 sc->sc_state |= HAVEBUS;
233 lpt_release_ppbus(struct lpt_data *sc)
235 ppb_release_bus(&sc->lpt_dev);
236 sc->sc_state &= ~HAVEBUS;
242 * Internal routine to lptprobe to do port tests of one byte value
245 lpt_port_test(struct lpt_data *sc, u_char data, u_char mask)
250 ppb_wdtr(&sc->lpt_dev, data);
254 temp = ppb_rdtr(&sc->lpt_dev) & mask;
256 while (temp != data && --timeout);
257 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
258 return (temp == data);
262 * Probe simplified by replacing multiple loops with a hardcoded
263 * test pattern - 1999/02/08 des@freebsd.org
265 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
266 * Based partially on Rod Grimes' printer probe
269 * 1) If no port address was given, use the bios detected ports
270 * and autodetect what ports the printers are on.
271 * 2) Otherwise, probe the data port at the address given,
272 * using the method in Rod Grimes' port probe.
273 * (Much code ripped off directly from Rod's probe.)
275 * Comments from Rod's probe:
277 * 1) You should be able to write to and read back the same value
278 * to the data port. Do an alternating zeros, alternating ones,
279 * walking zero, and walking one test to check for stuck bits.
281 * 2) You should be able to write to and read back the same value
282 * to the control port lower 5 bits, the upper 3 bits are reserved
283 * per the IBM PC technical reference manauls and different boards
284 * do different things with them. Do an alternating zeros, alternating
285 * ones, walking zero, and walking one test to check for stuck bits.
287 * Some printers drag the strobe line down when the are powered off
288 * so this bit has been masked out of the control port test.
290 * XXX Some printers may not like a fast pulse on init or strobe, I
291 * don't know at this point, if that becomes a problem these bits
292 * should be turned off in the mask byte for the control port test.
294 * We are finally left with a mask of 0x14, due to some printers
295 * being adamant about holding other bits high ........
297 * Before probing the control port, we write a 0 to the data port -
298 * If not, some printers chuck out garbage when the strobe line
301 * 3) Set the data and control ports to a value of 0
303 * This probe routine has been tested on Epson Lx-800, HP LJ3P,
304 * Epson FX-1170 and C.Itoh 8510RM
306 * Quick exit on fail added.
309 lpt_detect(struct lpt_data *sc)
311 static u_char testbyte[18] = {
312 0x55, /* alternating zeros */
313 0xaa, /* alternating ones */
314 0xfe, 0xfd, 0xfb, 0xf7,
315 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
316 0x01, 0x02, 0x04, 0x08,
317 0x10, 0x20, 0x40, 0x80 /* walking one */
319 int i, error, status;
321 status = 1; /* assume success */
323 if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) {
324 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
329 for (i = 0; i < 18 && status; i++)
330 if (!lpt_port_test(sc, testbyte[i], 0xff)) {
336 /* write 0's to control and data ports */
337 ppb_wdtr(&sc->lpt_dev, 0);
338 ppb_wctr(&sc->lpt_dev, 0);
340 lpt_release_ppbus(sc);
348 static struct ppb_device *
349 lptprobe(struct ppb_data *ppb)
355 cdevsw_add(&lpt_cdevsw);
357 sc = (struct lpt_data *) malloc(sizeof(struct lpt_data),
360 printf(LPT_NAME ": cannot malloc!\n");
363 bzero(sc, sizeof(struct lpt_data));
368 * lpt dependent initialisation.
373 * ppbus dependent initialisation.
375 sc->lpt_dev.id_unit = sc->lpt_unit;
376 sc->lpt_dev.name = lptdriver.name;
377 sc->lpt_dev.ppb = ppb;
378 sc->lpt_dev.intr = lptintr;
381 * Now, try to detect the printer.
383 if (!lpt_detect(sc)) {
388 /* Ok, go to next device on next probe */
391 return (&sc->lpt_dev);
395 lptattach(struct ppb_device *dev)
397 struct lpt_data *sc = lptdata[dev->id_unit];
403 printf(LPT_NAME "%d: <generic printer> on ppbus %d\n",
404 dev->id_unit, dev->ppb->ppb_link->adapter_unit);
406 sc->sc_primed = 0; /* not primed yet */
408 if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) {
409 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
413 ppb_wctr(&sc->lpt_dev, LPC_NINIT);
415 /* check if we can use interrupt, should be done by ppc stuff */
416 lprintf(("oldirq %x\n", sc->sc_irq));
417 if (ppb_get_irq(&sc->lpt_dev)) {
418 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
419 printf(LPT_NAME "%d: Interrupt-driven port\n", dev->id_unit);
422 lprintf((LPT_NAME "%d: Polled port\n", dev->id_unit));
424 lprintf(("irq %x\n", sc->sc_irq));
426 lpt_release_ppbus(sc);
428 make_dev(&lpt_cdevsw, dev->id_unit,
429 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", dev->id_unit);
430 make_dev(&lpt_cdevsw, dev->id_unit | LP_BYPASS,
431 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", dev->id_unit);
438 struct lpt_data *sc = arg;
441 lprintf(("T %x ", ppb_rstr(&sc->lpt_dev)));
442 if (sc->sc_state & OPEN) {
444 if (sc->sc_backoff > hz/LPTOUTMAX)
445 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
446 timeout(lptout, (caddr_t)sc, sc->sc_backoff);
448 sc->sc_state &= ~TOUT;
450 if (sc->sc_state & EERROR)
451 sc->sc_state &= ~EERROR;
454 * Avoid possible hangs do to missed interrupts
456 if (sc->sc_xfercnt) {
458 lpt_intr(sc->lpt_unit);
461 sc->sc_state &= ~OBUSY;
467 * lptopen -- reset the printer, then wait until it's selected and not busy.
468 * If LP_BYPASS flag is selected, then we do not try to select the
469 * printer -- this is just used for passing ioctls.
473 lptopen(dev_t dev, int flags, int fmt, struct proc *p)
479 u_int unit = LPTUNIT(minor(dev));
487 lprintf((LPT_NAME ": still open %x\n", sc->sc_state));
490 sc->sc_state |= LPTINIT;
492 sc->sc_flags = LPTFLAGS(minor(dev));
494 /* Check for open with BYPASS flag set. */
495 if (sc->sc_flags & LP_BYPASS) {
500 /* request the ppbus only if we don't have it already */
501 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0)
505 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags));
507 /* set IRQ status according to ENABLE_IRQ flag */
508 if (sc->sc_irq & LP_ENABLE_IRQ)
509 sc->sc_irq |= LP_USE_IRQ;
511 sc->sc_irq &= ~LP_USE_IRQ;
514 if ((sc->sc_flags & LP_NO_PRIME) == 0) {
515 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
516 ppb_wctr(&sc->lpt_dev, 0);
522 ppb_wctr(&sc->lpt_dev, LPC_SEL|LPC_NINIT);
524 /* wait till ready (printer running diagnostics) */
527 /* ran out of waiting for the printer */
528 if (trys++ >= LPINITRDY*4) {
531 lprintf(("status %x\n", ppb_rstr(&sc->lpt_dev)));
533 lpt_release_ppbus(sc);
537 /* wait 1/4 second, give up if we get a signal */
538 if (tsleep((caddr_t)sc, LPPRI|PCATCH, "lptinit", hz/4) !=
543 lpt_release_ppbus(sc);
547 /* is printer online and ready for output */
548 } while ((ppb_rstr(&sc->lpt_dev) &
549 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
550 (LPS_SEL|LPS_NBSY|LPS_NERR));
552 sc->sc_control = LPC_SEL|LPC_NINIT;
553 if (sc->sc_flags & LP_AUTOLF)
554 sc->sc_control |= LPC_AUTOL;
556 /* enable interrupt if interrupt-driven */
557 if (sc->sc_irq & LP_USE_IRQ)
558 sc->sc_control |= LPC_ENA;
560 ppb_wctr(&sc->lpt_dev, sc->sc_control);
563 sc->sc_inbuf = geteblk(BUFSIZE);
564 sc->sc_statbuf = geteblk(BUFSTATSIZE);
568 /* release the ppbus */
569 lpt_release_ppbus(sc);
571 /* only use timeout if using interrupt */
572 lprintf(("irq %x\n", sc->sc_irq));
573 if (sc->sc_irq & LP_USE_IRQ) {
574 sc->sc_state |= TOUT;
575 timeout(lptout, (caddr_t)sc,
576 (sc->sc_backoff = hz/LPTOUTINITIAL));
579 lprintf(("opened.\n"));
584 * lptclose -- close the device, free the local line buffer.
586 * Check for interrupted write call added.
590 lptclose(dev_t dev, int flags, int fmt, struct proc *p)
592 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))];
595 if(sc->sc_flags & LP_BYPASS)
598 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0)
601 sc->sc_state &= ~OPEN;
603 /* if the last write was interrupted, don't complete it */
604 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
605 while ((ppb_rstr(&sc->lpt_dev) &
606 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
607 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
608 /* wait 1/4 second, give up if we get a signal */
609 if (tsleep((caddr_t)sc, LPPRI|PCATCH,
610 "lpclose", hz) != EWOULDBLOCK)
613 ppb_wctr(&sc->lpt_dev, LPC_NINIT);
614 brelse(sc->sc_inbuf);
615 brelse(sc->sc_statbuf);
618 /* release the bus anyway */
619 lpt_release_ppbus(sc);
623 lprintf(("closed.\n"));
629 * Workhorse for actually spinning and writing bytes to printer
633 * This code is only used when we are polling the port
636 lpt_pushbytes(struct lpt_data *sc)
642 /* loop for every character .. */
643 while (sc->sc_xfercnt > 0) {
650 * Wait for printer ready.
651 * Loop 20 usecs testing BUSY bit, then sleep
652 * for exponentially increasing timeout. (vak)
654 for (spin = 0; NOT_READY(sc) && spin < MAX_SPIN; ++spin)
655 DELAY(1); /* XXX delay is NOT this accurate! */
656 if (spin >= MAX_SPIN) {
658 while (NOT_READY(sc)) {
660 * Now sleep, every cycle a
665 * But no more than 10 seconds. (vak)
669 err = tsleep((caddr_t)sc, LPPRI,
670 LPT_NAME "poll", tic);
671 if (err != EWOULDBLOCK) {
678 ppb_wdtr(&sc->lpt_dev, ch);
680 ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB);
681 ppb_wctr(&sc->lpt_dev, sc->sc_control);
688 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
692 lptread(dev_t dev, struct uio *uio, int ioflag)
694 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))];
697 if ((error = ppb_1284_negociate(&sc->lpt_dev, PPB_NIBBLE, 0)))
700 /* read data in an other buffer, read/write may be simultaneous */
702 while (uio->uio_resid) {
703 if ((error = ppb_1284_read(&sc->lpt_dev, PPB_NIBBLE,
704 sc->sc_statbuf->b_data, min(BUFSTATSIZE,
705 uio->uio_resid), &len))) {
710 goto error; /* no more data */
712 if ((error = uiomove(sc->sc_statbuf->b_data, len, uio)))
717 ppb_1284_terminate(&sc->lpt_dev);
722 * lptwrite --copy a line from user space to a local buffer, then call
723 * putc to get the chars moved to the output queue.
725 * Flagging of interrupted write added.
729 lptwrite(dev_t dev, struct uio *uio, int ioflag)
733 u_int unit = LPTUNIT(minor(dev));
734 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))];
736 if(sc->sc_flags & LP_BYPASS) {
737 /* we can't do writes in bypass mode */
741 /* request the ppbus only if we don't have it already */
742 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0)
745 sc->sc_state &= ~INTERRUPTED;
746 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
747 sc->sc_cp = sc->sc_inbuf->b_data ;
748 uiomove(sc->sc_cp, n, uio);
751 if (sc->sc_irq & LP_ENABLE_EXT) {
752 /* try any extended mode */
753 err = ppb_write(&sc->lpt_dev, sc->sc_cp,
757 /* if not all data was sent, we could rely
758 * on polling for the last bytes */
762 sc->sc_state |= INTERRUPTED;
765 /* advanced mode not avail */
766 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit);
771 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
773 /* if the printer is ready for a char, */
775 if ((sc->sc_state & OBUSY) == 0){
776 lprintf(("\nC %d. ", sc->sc_xfercnt));
778 lpt_intr(sc->lpt_unit);
782 if (sc->sc_state & OBUSY)
783 if ((err = tsleep((caddr_t)sc,
784 LPPRI|PCATCH, LPT_NAME "write", 0))) {
785 sc->sc_state |= INTERRUPTED;
790 /* check to see if we must do a polled write */
791 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
794 err = lpt_pushbytes(sc);
801 /* we have not been interrupted, release the ppbus */
802 lpt_release_ppbus(sc);
808 * lpt_intr -- handle printer interrupts which occur when the printer is
809 * ready to accept another char.
811 * do checking for interrupted write call.
817 struct lpt_data *sc = lptdata[unit];
821 /* we must own the bus to use it */
822 if ((sc->sc_state & HAVEBUS) == 0)
826 * Is printer online and ready for output?
828 * Avoid falling back to lptout() too quickly. First spin-loop
829 * to see if the printer will become ready ``really soon now''.
831 for (i = 0; i < 100 &&
832 ((sts=ppb_rstr(&sc->lpt_dev)) & RDY_MASK) != LP_READY; i++) ;
834 if ((sts & RDY_MASK) == LP_READY) {
835 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
836 sc->sc_backoff = hz/LPTOUTINITIAL;
838 if (sc->sc_xfercnt) {
840 /*lprintf(("%x ", *sc->sc_cp)); */
841 ppb_wdtr(&sc->lpt_dev, *sc->sc_cp++) ;
842 ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB);
844 ppb_wctr(&sc->lpt_dev, sc->sc_control);
846 /* any more data for printer */
847 if(--(sc->sc_xfercnt) > 0) return;
851 * No more data waiting for printer.
852 * Wakeup is not done if write call was interrupted.
854 sc->sc_state &= ~OBUSY;
856 if(!(sc->sc_state & INTERRUPTED))
860 } else { /* check for error */
861 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
862 (sc->sc_state & OPEN))
863 sc->sc_state |= EERROR;
864 /* lptout() will jump in and try to restart. */
866 lprintf(("sts %x ", sts));
872 /* call the interrupt at required spl level */
882 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
886 u_int unit = LPTUNIT(minor(dev));
887 u_char old_sc_irq; /* old printer IRQ status */
893 if(sc->sc_irq & LP_HAS_IRQ) {
896 * If the IRQ status is changed,
897 * this will only be visible on the
900 * If interrupt status changes,
901 * this gets syslog'd.
903 old_sc_irq = sc->sc_irq;
904 switch(*(int*)data) {
906 sc->sc_irq &= (~LP_ENABLE_IRQ);
909 sc->sc_irq &= (~LP_ENABLE_EXT);
910 sc->sc_irq |= LP_ENABLE_IRQ;
913 /* classic irq based transfer and advanced
914 * modes are in conflict
916 sc->sc_irq &= (~LP_ENABLE_IRQ);
917 sc->sc_irq |= LP_ENABLE_EXT;
920 sc->sc_irq &= (~LP_ENABLE_EXT);
926 if (old_sc_irq != sc->sc_irq )
927 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n",
929 (sc->sc_irq & LP_ENABLE_IRQ)?
930 "interrupt-driven":"polled",
931 (sc->sc_irq & LP_ENABLE_EXT)?
932 "extended":"standard");
933 } else /* polled port */