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
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 1.10 2004/09/19 00:23:33 dillon Exp $
56 * Device Driver for AT parallel printer port
57 * Written by William Jolitz 12/18/90
61 * Updated for ppbus by Nicolas Souchu
67 #include <sys/param.h>
68 #include <sys/systm.h>
69 #include <sys/module.h>
72 #include <sys/kernel.h>
74 #include <sys/syslog.h>
75 #include <sys/malloc.h>
77 #include <machine/clock.h>
78 #include <machine/bus.h>
79 #include <machine/resource.h>
83 #include <bus/ppbus/ppbconf.h>
84 #include <bus/ppbus/ppb_1284.h>
87 #include <bus/ppbus/ppbio.h>
89 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers");
94 #define lprintf(args) \
99 static int volatile lptflag = 1;
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 */
106 #define BUFSTATSIZE 32
108 #define LPTUNIT(s) ((s)&0x03)
109 #define LPTFLAGS(s) ((s)&0xfc)
113 /* default case: negative prime, negative ack, handshake strobe,
117 #define LP_UNITMASK 0x03 /* up to 4 units */
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 */
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 */
136 struct resource *intr_resource; /* interrupt resource */
137 void *intr_cookie; /* interrupt registration cookie */
138 struct callout sc_callout;
141 #define LPT_NAME "lpt" /* our official name */
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);
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)))
154 static void lptintr(device_t dev);
155 static void lpt_intr(void *arg); /* without spls */
157 static devclass_t lpt_devclass;
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 */
170 #define HAVEBUS (1<<8) /* the driver owns the bus */
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)
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)
183 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
184 #define MAX_SPIN 20 /* Max delay for device ready in usecs */
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;
193 #define CDEV_MAJOR 16
194 static struct cdevsw lpt_cdevsw = {
196 /* maj */ CDEV_MAJOR,
202 /* close */ lptclose,
204 /* write */ lptwrite,
205 /* ioctl */ lptioctl,
208 /* strategy */ nostrategy,
214 lpt_request_ppbus(device_t dev, int how)
216 device_t ppbus = device_get_parent(dev);
217 struct lpt_data *sc = DEVTOSOFTC(dev);
220 if (sc->sc_state & HAVEBUS)
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;
231 lpt_release_ppbus(device_t dev)
233 device_t ppbus = device_get_parent(dev);
234 struct lpt_data *sc = DEVTOSOFTC(dev);
237 if ((error = ppb_release_bus(ppbus, dev)) == 0)
238 sc->sc_state &= ~HAVEBUS;
244 * Internal routine to lptprobe to do port tests of one byte value
247 lpt_port_test(device_t ppbus, u_char data, u_char mask)
252 ppb_wdtr(ppbus, data);
256 temp = ppb_rdtr(ppbus) & mask;
258 while (temp != data && --timeout);
259 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
260 return (temp == data);
264 * Probe simplified by replacing multiple loops with a hardcoded
265 * test pattern - 1999/02/08 des@freebsd.org
267 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
268 * Based partially on Rod Grimes' printer probe
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.)
277 * Comments from Rod's probe:
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.
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.
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.
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.
296 * We are finally left with a mask of 0x14, due to some printers
297 * being adamant about holding other bits high ........
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
303 * 3) Set the data and control ports to a value of 0
305 * This probe routine has been tested on Epson Lx-800, HP LJ3P,
306 * Epson FX-1170 and C.Itoh 8510RM
308 * Quick exit on fail added.
311 lpt_detect(device_t dev)
313 device_t ppbus = device_get_parent(dev);
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 */
323 int i, error, status;
325 status = 1; /* assume success */
327 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
328 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
333 for (i = 0; i < 18 && status; i++)
334 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) {
340 /* write 0's to control and data ports */
344 lpt_release_ppbus(dev);
350 lpt_identify(driver_t *driver, device_t parent)
353 BUS_ADD_CHILD(parent, 0, LPT_NAME, 0);
360 lpt_probe(device_t dev)
364 sc = DEVTOSOFTC(dev);
365 bzero(sc, sizeof(struct lpt_data));
368 * Now, try to detect the printer.
370 if (!lpt_detect(dev))
373 device_set_desc(dev, "Printer");
379 lpt_attach(device_t dev)
381 device_t ppbus = device_get_parent(dev);
382 struct lpt_data *sc = DEVTOSOFTC(dev);
383 int zero = 0, unit = device_get_unit(dev);
387 sc->sc_primed = 0; /* not primed yet */
388 callout_init(&sc->sc_callout);
390 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
391 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
395 ppb_wctr(ppbus, LPC_NINIT);
397 /* check if we can use interrupt, should be done by ppc stuff */
398 lprintf(("oldirq %x\n", sc->sc_irq));
400 /* retrieve the ppbus irq */
401 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq);
404 /* declare our interrupt handler */
405 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
406 &zero, irq, irq, 1, RF_SHAREABLE);
408 if (sc->intr_resource) {
409 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
410 device_printf(dev, "Interrupt-driven port\n");
413 device_printf(dev, "Polled port\n");
415 lprintf(("irq %x %x\n", irq, sc->sc_irq));
417 lpt_release_ppbus(dev);
419 cdevsw_add(&lpt_cdevsw, LP_UNITMASK, unit);
420 make_dev(&lpt_cdevsw, unit,
421 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit);
422 make_dev(&lpt_cdevsw, unit | LP_BYPASS,
423 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit);
430 device_t dev = (device_t)arg;
431 struct lpt_data *sc = DEVTOSOFTC(dev);
433 device_t ppbus = device_get_parent(dev);
436 lprintf(("T %x ", ppb_rstr(ppbus)));
437 if (sc->sc_state & OPEN) {
439 if (sc->sc_backoff > hz/LPTOUTMAX)
440 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
441 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, dev);
443 sc->sc_state &= ~TOUT;
446 if (sc->sc_state & EERROR)
447 sc->sc_state &= ~EERROR;
450 * Avoid possible hangs due to missed interrupts
452 if (sc->sc_xfercnt) {
455 sc->sc_state &= ~OBUSY;
456 wakeup((caddr_t)dev);
461 * lptopen -- reset the printer, then wait until it's selected and not busy.
462 * If LP_BYPASS flag is selected, then we do not try to select the
463 * printer -- this is just used for passing ioctls.
467 lptopen(dev_t dev, int flags, int fmt, struct thread *p)
471 u_int unit = LPTUNIT(minor(dev));
472 struct lpt_data *sc = UNITOSOFTC(unit);
473 device_t lptdev = UNITODEVICE(unit);
474 device_t ppbus = device_get_parent(lptdev);
480 lprintf((LPT_NAME ": still open %x\n", sc->sc_state));
483 sc->sc_state |= LPTINIT;
485 sc->sc_flags = LPTFLAGS(minor(dev));
487 /* Check for open with BYPASS flag set. */
488 if (sc->sc_flags & LP_BYPASS) {
493 /* request the ppbus only if we don't have it already */
494 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
495 /* give it a chance to try later */
501 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags));
503 /* set IRQ status according to ENABLE_IRQ flag
505 if (sc->sc_irq & LP_ENABLE_IRQ)
506 sc->sc_irq |= LP_USE_IRQ;
508 sc->sc_irq &= ~LP_USE_IRQ;
511 if ((sc->sc_flags & LP_NO_PRIME) == 0) {
512 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
519 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT);
521 /* wait till ready (printer running diagnostics) */
524 /* ran out of waiting for the printer */
525 if (trys++ >= LPINITRDY*4) {
528 lprintf(("status %x\n", ppb_rstr(ppbus)));
530 lpt_release_ppbus(lptdev);
534 /* wait 1/4 second, give up if we get a signal */
535 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) !=
540 lpt_release_ppbus(lptdev);
544 /* is printer online and ready for output */
545 } while ((ppb_rstr(ppbus) &
546 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
547 (LPS_SEL|LPS_NBSY|LPS_NERR));
549 sc->sc_control = LPC_SEL|LPC_NINIT;
550 if (sc->sc_flags & LP_AUTOLF)
551 sc->sc_control |= LPC_AUTOL;
553 /* enable interrupt if interrupt-driven */
554 if (sc->sc_irq & LP_USE_IRQ)
555 sc->sc_control |= LPC_ENA;
557 ppb_wctr(ppbus, sc->sc_control);
560 sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK);
561 sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK);
565 /* release the ppbus */
566 lpt_release_ppbus(lptdev);
568 /* only use timeout if using interrupt */
569 lprintf(("irq %x\n", sc->sc_irq));
570 if (sc->sc_irq & LP_USE_IRQ) {
571 sc->sc_state |= TOUT;
572 sc->sc_backoff = hz / LPTOUTINITIAL;
573 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, lptdev);
576 lprintf(("opened.\n"));
581 * lptclose -- close the device, free the local line buffer.
583 * Check for interrupted write call added.
587 lptclose(dev_t dev, int flags, int fmt, struct thread *p)
589 u_int unit = LPTUNIT(minor(dev));
590 struct lpt_data *sc = UNITOSOFTC(unit);
591 device_t lptdev = UNITODEVICE(unit);
592 device_t ppbus = device_get_parent(lptdev);
595 if(sc->sc_flags & LP_BYPASS)
598 if ((err = lpt_request_ppbus(lptdev, 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(ppbus) &
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)lptdev, PCATCH,
610 "lpclose", hz) != EWOULDBLOCK) {
615 callout_stop(&sc->sc_callout);
616 ppb_wctr(ppbus, LPC_NINIT);
617 free(sc->sc_inbuf, M_LPT);
618 free(sc->sc_statbuf, M_LPT);
621 /* release the bus anyway
622 * unregistration of interrupt forced by release
624 lpt_release_ppbus(lptdev);
628 lprintf(("closed.\n"));
634 * Workhorse for actually spinning and writing bytes to printer
638 * This code is only used when we are polling the port
641 lpt_pushbytes(device_t dev)
643 struct lpt_data *sc = DEVTOSOFTC(dev);
644 device_t ppbus = device_get_parent(dev);
649 /* loop for every character .. */
650 while (sc->sc_xfercnt > 0) {
657 * Wait for printer ready.
658 * Loop 20 usecs testing BUSY bit, then sleep
659 * for exponentially increasing timeout. (vak)
661 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin)
662 DELAY(1); /* XXX delay is NOT this accurate! */
663 if (spin >= MAX_SPIN) {
665 while (NOT_READY(ppbus)) {
667 * Now sleep, every cycle a
672 * But no more than 10 seconds. (vak)
676 err = tsleep((caddr_t)dev, 0,
677 LPT_NAME "poll", tic);
678 if (err != EWOULDBLOCK) {
687 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
688 ppb_wctr(ppbus, sc->sc_control);
695 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
699 lptread(dev_t dev, struct uio *uio, int ioflag)
701 u_int unit = LPTUNIT(minor(dev));
702 struct lpt_data *sc = UNITOSOFTC(unit);
703 device_t lptdev = UNITODEVICE(unit);
704 device_t ppbus = device_get_parent(lptdev);
707 if (sc->sc_flags & LP_BYPASS) {
708 /* we can't do reads in bypass mode */
712 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0)))
715 /* read data in an other buffer, read/write may be simultaneous */
717 while (uio->uio_resid) {
718 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE,
719 sc->sc_statbuf, min(BUFSTATSIZE,
720 uio->uio_resid), &len))) {
725 goto error; /* no more data */
727 if ((error = uiomove(sc->sc_statbuf, len, uio)))
732 ppb_1284_terminate(ppbus);
737 * lptwrite --copy a line from user space to a local buffer, then call
738 * putc to get the chars moved to the output queue.
740 * Flagging of interrupted write added.
744 lptwrite(dev_t dev, struct uio *uio, int ioflag)
748 u_int unit = LPTUNIT(minor(dev));
749 struct lpt_data *sc = UNITOSOFTC(unit);
750 device_t lptdev = UNITODEVICE(unit);
751 device_t ppbus = device_get_parent(lptdev);
753 if(sc->sc_flags & LP_BYPASS) {
754 /* we can't do writes in bypass mode */
758 /* request the ppbus only if we don't have it already */
759 /* XXX interrupt registration?! */
760 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
763 /* if interrupts are working, register the handler */
764 if (sc->sc_irq & LP_USE_IRQ) {
765 /* register our interrupt handler */
766 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource,
767 INTR_TYPE_TTY, lpt_intr, lptdev,
770 device_printf(lptdev, "handler registration failed, polled mode.\n");
771 sc->sc_irq &= ~LP_USE_IRQ;
775 sc->sc_state &= ~INTERRUPTED;
776 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
777 sc->sc_cp = sc->sc_inbuf;
778 uiomove(sc->sc_cp, n, uio);
781 if (sc->sc_irq & LP_ENABLE_EXT) {
782 /* try any extended mode */
783 err = ppb_write(ppbus, sc->sc_cp,
787 /* if not all data was sent, we could rely
788 * on polling for the last bytes */
792 sc->sc_state |= INTERRUPTED;
795 /* advanced mode not avail */
796 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit);
801 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
803 /* if the printer is ready for a char, */
805 if ((sc->sc_state & OBUSY) == 0){
806 lprintf(("\nC %d. ", sc->sc_xfercnt));
810 if (sc->sc_state & OBUSY)
811 if ((err = tsleep((caddr_t)lptdev,
812 PCATCH, LPT_NAME "write", 0))) {
813 sc->sc_state |= INTERRUPTED;
818 /* check to see if we must do a polled write */
819 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
822 err = lpt_pushbytes(lptdev);
829 /* we have not been interrupted, release the ppbus */
830 lpt_release_ppbus(lptdev);
836 * lpt_intr -- handle printer interrupts which occur when the printer is
837 * ready to accept another char.
839 * do checking for interrupted write call.
845 device_t lptdev = (device_t)arg;
846 device_t ppbus = device_get_parent(lptdev);
847 struct lpt_data *sc = DEVTOSOFTC(lptdev);
851 /* we must own the bus to use it */
852 if ((sc->sc_state & HAVEBUS) == 0)
856 * Is printer online and ready for output?
858 * Avoid falling back to lptout() too quickly. First spin-loop
859 * to see if the printer will become ready ``really soon now''.
861 for (i = 0; i < 100 &&
862 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ;
864 if ((sts & RDY_MASK) == LP_READY) {
865 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
866 sc->sc_backoff = hz/LPTOUTINITIAL;
868 if (sc->sc_xfercnt) {
870 /*lprintf(("%x ", *sc->sc_cp)); */
871 ppb_wdtr(ppbus, *sc->sc_cp++) ;
872 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
874 ppb_wctr(ppbus, sc->sc_control);
876 /* any more data for printer */
877 if(--(sc->sc_xfercnt) > 0) return;
881 * No more data waiting for printer.
882 * Wakeup is not done if write call was not interrupted.
884 sc->sc_state &= ~OBUSY;
886 if(!(sc->sc_state & INTERRUPTED))
887 wakeup((caddr_t)lptdev);
890 } else { /* check for error */
891 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
892 (sc->sc_state & OPEN))
893 sc->sc_state |= EERROR;
894 /* lptout() will jump in and try to restart. */
896 lprintf(("sts %x ", sts));
900 lptintr(device_t dev)
902 /* call the interrupt at required spl level */
912 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *p)
915 u_int unit = LPTUNIT(minor(dev));
916 struct lpt_data *sc = UNITOSOFTC(unit);
917 u_char old_sc_irq; /* old printer IRQ status */
921 if(sc->sc_irq & LP_HAS_IRQ) {
924 * If the IRQ status is changed,
925 * this will only be visible on the
928 * If interrupt status changes,
929 * this gets syslog'd.
931 old_sc_irq = sc->sc_irq;
932 switch(*(int*)data) {
934 sc->sc_irq &= (~LP_ENABLE_IRQ);
937 sc->sc_irq &= (~LP_ENABLE_EXT);
938 sc->sc_irq |= LP_ENABLE_IRQ;
941 /* classic irq based transfer and advanced
942 * modes are in conflict
944 sc->sc_irq &= (~LP_ENABLE_IRQ);
945 sc->sc_irq |= LP_ENABLE_EXT;
948 sc->sc_irq &= (~LP_ENABLE_EXT);
954 if (old_sc_irq != sc->sc_irq )
955 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n",
957 (sc->sc_irq & LP_ENABLE_IRQ)?
958 "interrupt-driven":"polled",
959 (sc->sc_irq & LP_ENABLE_EXT)?
960 "extended":"standard");
961 } else /* polled port */
971 static device_method_t lpt_methods[] = {
972 /* device interface */
973 DEVMETHOD(device_identify, lpt_identify),
974 DEVMETHOD(device_probe, lpt_probe),
975 DEVMETHOD(device_attach, lpt_attach),
980 static driver_t lpt_driver = {
983 sizeof(struct lpt_data),
986 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0);