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 1.16 2006/09/05 00:55:38 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/device.h>
73 #include <sys/kernel.h>
75 #include <sys/syslog.h>
76 #include <sys/thread2.h>
77 #include <sys/malloc.h>
79 #include <machine/clock.h>
80 #include <machine/bus.h>
81 #include <machine/resource.h>
85 #include <bus/ppbus/ppbconf.h>
86 #include <bus/ppbus/ppb_1284.h>
89 #include <bus/ppbus/ppbio.h>
91 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers");
96 #define lprintf(args) \
101 static int volatile lptflag = 1;
104 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */
105 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
106 #define LPTOUTMAX 1 /* maximal timeout 1 s */
108 #define BUFSTATSIZE 32
110 #define LPTUNIT(s) ((s)&0x03)
111 #define LPTFLAGS(s) ((s)&0xfc)
115 /* default case: negative prime, negative ack, handshake strobe,
119 #define LP_UNITMASK 0x03 /* up to 4 units */
120 #define LP_POS_INIT 0x04 /* if we are a postive init signal */
121 #define LP_POS_ACK 0x08 /* if we are a positive going ack */
122 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */
123 #define LP_PRIMEOPEN 0x20 /* prime on every open */
124 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */
125 #define LP_BYPASS 0x80 /* bypass printer ready checks */
131 u_short sc_irq ; /* IRQ status of port */
132 #define LP_HAS_IRQ 0x01 /* we have an irq available */
133 #define LP_USE_IRQ 0x02 /* we are using our irq */
134 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */
135 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */
136 u_char sc_backoff ; /* time to call lptout() again */
138 struct resource *intr_resource; /* interrupt resource */
139 void *intr_cookie; /* interrupt registration cookie */
140 struct callout sc_callout;
143 #define LPT_NAME "lpt" /* our official name */
145 static timeout_t lptout;
146 static int lpt_port_test(device_t dev, u_char data, u_char mask);
147 static int lpt_detect(device_t dev);
149 #define DEVTOSOFTC(dev) \
150 ((struct lpt_data *)device_get_softc(dev))
151 #define UNITOSOFTC(unit) \
152 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit)))
153 #define UNITODEVICE(unit) \
154 (devclass_get_device(lpt_devclass, (unit)))
156 static void lptintr(device_t dev);
157 static void lpt_intr(void *arg); /* without spls */
159 static devclass_t lpt_devclass;
163 #define OPEN (1<<0) /* device is open */
164 #define ASLP (1<<1) /* awaiting draining of printer */
165 #define EERROR (1<<2) /* error was received from printer */
166 #define OBUSY (1<<3) /* printer is busy doing output */
167 #define LPTOUT (1<<4) /* timeout while not selected */
168 #define TOUT (1<<5) /* timeout while not selected */
169 #define LPTINIT (1<<6) /* waiting to initialize for open */
170 #define INTERRUPTED (1<<7) /* write call was interrupted */
172 #define HAVEBUS (1<<8) /* the driver owns the bus */
175 /* status masks to interrogate printer status */
176 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
177 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
179 /* Printer Ready condition - from lpa.c */
180 /* Only used in polling code */
181 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
182 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
183 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK)
185 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
186 #define MAX_SPIN 20 /* Max delay for device ready in usecs */
189 static d_open_t lptopen;
190 static d_close_t lptclose;
191 static d_write_t lptwrite;
192 static d_read_t lptread;
193 static d_ioctl_t lptioctl;
195 #define CDEV_MAJOR 16
196 static struct dev_ops lpt_ops = {
197 { LPT_NAME, CDEV_MAJOR, 0 },
206 lpt_request_ppbus(device_t dev, int how)
208 device_t ppbus = device_get_parent(dev);
209 struct lpt_data *sc = DEVTOSOFTC(dev);
212 if (sc->sc_state & HAVEBUS)
215 /* we have the bus only if the request succeded */
216 if ((error = ppb_request_bus(ppbus, dev, how)) == 0)
217 sc->sc_state |= HAVEBUS;
223 lpt_release_ppbus(device_t dev)
225 device_t ppbus = device_get_parent(dev);
226 struct lpt_data *sc = DEVTOSOFTC(dev);
229 if ((error = ppb_release_bus(ppbus, dev)) == 0)
230 sc->sc_state &= ~HAVEBUS;
236 * Internal routine to lptprobe to do port tests of one byte value
239 lpt_port_test(device_t ppbus, u_char data, u_char mask)
244 ppb_wdtr(ppbus, data);
248 temp = ppb_rdtr(ppbus) & mask;
250 while (temp != data && --timeout);
251 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
252 return (temp == data);
256 * Probe simplified by replacing multiple loops with a hardcoded
257 * test pattern - 1999/02/08 des@freebsd.org
259 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
260 * Based partially on Rod Grimes' printer probe
263 * 1) If no port address was given, use the bios detected ports
264 * and autodetect what ports the printers are on.
265 * 2) Otherwise, probe the data port at the address given,
266 * using the method in Rod Grimes' port probe.
267 * (Much code ripped off directly from Rod's probe.)
269 * Comments from Rod's probe:
271 * 1) You should be able to write to and read back the same value
272 * to the data port. Do an alternating zeros, alternating ones,
273 * walking zero, and walking one test to check for stuck bits.
275 * 2) You should be able to write to and read back the same value
276 * to the control port lower 5 bits, the upper 3 bits are reserved
277 * per the IBM PC technical reference manauls and different boards
278 * do different things with them. Do an alternating zeros, alternating
279 * ones, walking zero, and walking one test to check for stuck bits.
281 * Some printers drag the strobe line down when the are powered off
282 * so this bit has been masked out of the control port test.
284 * XXX Some printers may not like a fast pulse on init or strobe, I
285 * don't know at this point, if that becomes a problem these bits
286 * should be turned off in the mask byte for the control port test.
288 * We are finally left with a mask of 0x14, due to some printers
289 * being adamant about holding other bits high ........
291 * Before probing the control port, we write a 0 to the data port -
292 * If not, some printers chuck out garbage when the strobe line
295 * 3) Set the data and control ports to a value of 0
297 * This probe routine has been tested on Epson Lx-800, HP LJ3P,
298 * Epson FX-1170 and C.Itoh 8510RM
300 * Quick exit on fail added.
303 lpt_detect(device_t dev)
305 device_t ppbus = device_get_parent(dev);
307 static u_char testbyte[18] = {
308 0x55, /* alternating zeros */
309 0xaa, /* alternating ones */
310 0xfe, 0xfd, 0xfb, 0xf7,
311 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
312 0x01, 0x02, 0x04, 0x08,
313 0x10, 0x20, 0x40, 0x80 /* walking one */
315 int i, error, status;
317 status = 1; /* assume success */
319 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
320 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
325 for (i = 0; i < 18 && status; i++)
326 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) {
332 /* write 0's to control and data ports */
336 lpt_release_ppbus(dev);
345 lpt_probe(device_t dev)
349 sc = DEVTOSOFTC(dev);
350 bzero(sc, sizeof(struct lpt_data));
353 * Now, try to detect the printer.
355 if (!lpt_detect(dev))
358 device_set_desc(dev, "Printer");
364 lpt_attach(device_t dev)
366 device_t ppbus = device_get_parent(dev);
367 struct lpt_data *sc = DEVTOSOFTC(dev);
368 int zero = 0, unit = device_get_unit(dev);
372 sc->sc_primed = 0; /* not primed yet */
373 callout_init(&sc->sc_callout);
375 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
376 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
380 ppb_wctr(ppbus, LPC_NINIT);
382 /* check if we can use interrupt, should be done by ppc stuff */
383 lprintf(("oldirq %x\n", sc->sc_irq));
385 /* retrieve the ppbus irq */
386 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq);
389 /* declare our interrupt handler */
390 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
391 &zero, irq, irq, 1, RF_SHAREABLE);
393 if (sc->intr_resource) {
394 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
395 device_printf(dev, "Interrupt-driven port\n");
398 device_printf(dev, "Polled port\n");
400 lprintf(("irq %x %x\n", irq, sc->sc_irq));
402 lpt_release_ppbus(dev);
404 dev_ops_add(&lpt_ops, LP_UNITMASK, unit);
405 make_dev(&lpt_ops, unit,
406 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit);
407 make_dev(&lpt_ops, unit | LP_BYPASS,
408 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit);
415 device_t dev = (device_t)arg;
416 struct lpt_data *sc = DEVTOSOFTC(dev);
418 device_t ppbus = device_get_parent(dev);
421 lprintf(("T %x ", ppb_rstr(ppbus)));
422 if (sc->sc_state & OPEN) {
424 if (sc->sc_backoff > hz/LPTOUTMAX)
425 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
426 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, dev);
428 sc->sc_state &= ~TOUT;
431 if (sc->sc_state & EERROR)
432 sc->sc_state &= ~EERROR;
435 * Avoid possible hangs due to missed interrupts
437 if (sc->sc_xfercnt) {
440 sc->sc_state &= ~OBUSY;
441 wakeup((caddr_t)dev);
446 * lptopen -- reset the printer, then wait until it's selected and not busy.
447 * If LP_BYPASS flag is selected, then we do not try to select the
448 * printer -- this is just used for passing ioctls.
452 lptopen(struct dev_open_args *ap)
454 dev_t dev = ap->a_head.a_dev;
456 u_int unit = LPTUNIT(minor(dev));
457 struct lpt_data *sc = UNITOSOFTC(unit);
458 device_t lptdev = UNITODEVICE(unit);
459 device_t ppbus = device_get_parent(lptdev);
465 lprintf((LPT_NAME ": still open %x\n", sc->sc_state));
468 sc->sc_state |= LPTINIT;
470 sc->sc_flags = LPTFLAGS(minor(dev));
472 /* Check for open with BYPASS flag set. */
473 if (sc->sc_flags & LP_BYPASS) {
478 /* request the ppbus only if we don't have it already */
479 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
480 /* give it a chance to try later */
486 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags));
488 /* set IRQ status according to ENABLE_IRQ flag
490 if (sc->sc_irq & LP_ENABLE_IRQ)
491 sc->sc_irq |= LP_USE_IRQ;
493 sc->sc_irq &= ~LP_USE_IRQ;
496 if ((sc->sc_flags & LP_NO_PRIME) == 0) {
497 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
504 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT);
506 /* wait till ready (printer running diagnostics) */
509 /* ran out of waiting for the printer */
510 if (trys++ >= LPINITRDY*4) {
513 lprintf(("status %x\n", ppb_rstr(ppbus)));
515 lpt_release_ppbus(lptdev);
519 /* wait 1/4 second, give up if we get a signal */
520 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) !=
525 lpt_release_ppbus(lptdev);
529 /* is printer online and ready for output */
530 } while ((ppb_rstr(ppbus) &
531 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
532 (LPS_SEL|LPS_NBSY|LPS_NERR));
534 sc->sc_control = LPC_SEL|LPC_NINIT;
535 if (sc->sc_flags & LP_AUTOLF)
536 sc->sc_control |= LPC_AUTOL;
538 /* enable interrupt if interrupt-driven */
539 if (sc->sc_irq & LP_USE_IRQ)
540 sc->sc_control |= LPC_ENA;
542 ppb_wctr(ppbus, sc->sc_control);
545 sc->sc_inbuf = kmalloc(BUFSIZE, M_LPT, M_WAITOK);
546 sc->sc_statbuf = kmalloc(BUFSTATSIZE, M_LPT, M_WAITOK);
551 /* release the ppbus */
552 lpt_release_ppbus(lptdev);
554 /* only use timeout if using interrupt */
555 lprintf(("irq %x\n", sc->sc_irq));
556 if (sc->sc_irq & LP_USE_IRQ) {
557 sc->sc_state |= TOUT;
558 sc->sc_backoff = hz / LPTOUTINITIAL;
559 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, lptdev);
562 lprintf(("opened.\n"));
567 * lptclose -- close the device, free the local line buffer.
569 * Check for interrupted write call added.
573 lptclose(struct dev_close_args *ap)
575 dev_t dev = ap->a_head.a_dev;
576 u_int unit = LPTUNIT(minor(dev));
577 struct lpt_data *sc = UNITOSOFTC(unit);
578 device_t lptdev = UNITODEVICE(unit);
579 device_t ppbus = device_get_parent(lptdev);
582 if(sc->sc_flags & LP_BYPASS)
585 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
588 sc->sc_state &= ~OPEN;
590 /* if the last write was interrupted, don't complete it */
591 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) {
592 while ((ppb_rstr(ppbus) &
593 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
594 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) {
595 /* wait 1/4 second, give up if we get a signal */
596 if (tsleep((caddr_t)lptdev, PCATCH,
597 "lpclose", hz) != EWOULDBLOCK) {
602 callout_stop(&sc->sc_callout);
603 ppb_wctr(ppbus, LPC_NINIT);
604 kfree(sc->sc_inbuf, M_LPT);
605 kfree(sc->sc_statbuf, M_LPT);
608 /* release the bus anyway
609 * unregistration of interrupt forced by release
611 lpt_release_ppbus(lptdev);
615 lprintf(("closed.\n"));
621 * Workhorse for actually spinning and writing bytes to printer
625 * This code is only used when we are polling the port
628 lpt_pushbytes(device_t dev)
630 struct lpt_data *sc = DEVTOSOFTC(dev);
631 device_t ppbus = device_get_parent(dev);
636 /* loop for every character .. */
637 while (sc->sc_xfercnt > 0) {
644 * Wait for printer ready.
645 * Loop 20 usecs testing BUSY bit, then sleep
646 * for exponentially increasing timeout. (vak)
648 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin)
649 DELAY(1); /* XXX delay is NOT this accurate! */
650 if (spin >= MAX_SPIN) {
652 while (NOT_READY(ppbus)) {
654 * Now sleep, every cycle a
659 * But no more than 10 seconds. (vak)
663 err = tsleep((caddr_t)dev, 0,
664 LPT_NAME "poll", tic);
665 if (err != EWOULDBLOCK) {
674 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
675 ppb_wctr(ppbus, sc->sc_control);
682 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
686 lptread(struct dev_read_args *ap)
688 dev_t dev = ap->a_head.a_dev;
689 struct uio *uio = ap->a_uio;
690 u_int unit = LPTUNIT(minor(dev));
691 struct lpt_data *sc = UNITOSOFTC(unit);
692 device_t lptdev = UNITODEVICE(unit);
693 device_t ppbus = device_get_parent(lptdev);
696 if (sc->sc_flags & LP_BYPASS) {
697 /* we can't do reads in bypass mode */
701 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0)))
704 /* read data in an other buffer, read/write may be simultaneous */
706 while (uio->uio_resid) {
707 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE,
708 sc->sc_statbuf, min(BUFSTATSIZE,
709 uio->uio_resid), &len))) {
714 goto error; /* no more data */
716 if ((error = uiomove(sc->sc_statbuf, len, uio)))
721 ppb_1284_terminate(ppbus);
726 * lptwrite --copy a line from user space to a local buffer, then call
727 * putc to get the chars moved to the output queue.
729 * Flagging of interrupted write added.
733 lptwrite(struct dev_write_args *ap)
735 dev_t dev = ap->a_head.a_dev;
736 struct uio *uio = ap->a_uio;
739 u_int unit = LPTUNIT(minor(dev));
740 struct lpt_data *sc = UNITOSOFTC(unit);
741 device_t lptdev = UNITODEVICE(unit);
742 device_t ppbus = device_get_parent(lptdev);
744 if(sc->sc_flags & LP_BYPASS) {
745 /* we can't do writes in bypass mode */
749 /* request the ppbus only if we don't have it already */
750 /* XXX interrupt registration?! */
751 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
754 /* if interrupts are working, register the handler */
755 if (sc->sc_irq & LP_USE_IRQ) {
756 /* register our interrupt handler */
757 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource,
759 &sc->intr_cookie, NULL);
761 device_printf(lptdev, "handler registration failed, polled mode.\n");
762 sc->sc_irq &= ~LP_USE_IRQ;
766 sc->sc_state &= ~INTERRUPTED;
767 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
768 sc->sc_cp = sc->sc_inbuf;
769 uiomove(sc->sc_cp, n, uio);
772 if (sc->sc_irq & LP_ENABLE_EXT) {
773 /* try any extended mode */
774 err = ppb_write(ppbus, sc->sc_cp,
778 /* if not all data was sent, we could rely
779 * on polling for the last bytes */
783 sc->sc_state |= INTERRUPTED;
786 /* advanced mode not avail */
787 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit);
792 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
794 /* if the printer is ready for a char, */
796 if ((sc->sc_state & OBUSY) == 0){
797 lprintf(("\nC %d. ", sc->sc_xfercnt));
801 if (sc->sc_state & OBUSY)
802 if ((err = tsleep((caddr_t)lptdev,
803 PCATCH, LPT_NAME "write", 0))) {
804 sc->sc_state |= INTERRUPTED;
809 /* check to see if we must do a polled write */
810 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
813 err = lpt_pushbytes(lptdev);
820 /* we have not been interrupted, release the ppbus */
821 lpt_release_ppbus(lptdev);
827 * lpt_intr -- handle printer interrupts which occur when the printer is
828 * ready to accept another char.
830 * do checking for interrupted write call.
836 device_t lptdev = (device_t)arg;
837 device_t ppbus = device_get_parent(lptdev);
838 struct lpt_data *sc = DEVTOSOFTC(lptdev);
842 /* we must own the bus to use it */
843 if ((sc->sc_state & HAVEBUS) == 0)
847 * Is printer online and ready for output?
849 * Avoid falling back to lptout() too quickly. First spin-loop
850 * to see if the printer will become ready ``really soon now''.
852 for (i = 0; i < 100 &&
853 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ;
855 if ((sts & RDY_MASK) == LP_READY) {
856 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
857 sc->sc_backoff = hz/LPTOUTINITIAL;
859 if (sc->sc_xfercnt) {
861 /*lprintf(("%x ", *sc->sc_cp)); */
862 ppb_wdtr(ppbus, *sc->sc_cp++) ;
863 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
865 ppb_wctr(ppbus, sc->sc_control);
867 /* any more data for printer */
868 if(--(sc->sc_xfercnt) > 0) return;
872 * No more data waiting for printer.
873 * Wakeup is not done if write call was not interrupted.
875 sc->sc_state &= ~OBUSY;
877 if(!(sc->sc_state & INTERRUPTED))
878 wakeup((caddr_t)lptdev);
881 } else { /* check for error */
882 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
883 (sc->sc_state & OPEN))
884 sc->sc_state |= EERROR;
885 /* lptout() will jump in and try to restart. */
887 lprintf(("sts %x ", sts));
891 lptintr(device_t dev)
893 /* call the interrupt at required spl level */
902 lptioctl(struct dev_ioctl_args *ap)
904 dev_t dev = ap->a_head.a_dev;
906 u_int unit = LPTUNIT(minor(dev));
907 struct lpt_data *sc = UNITOSOFTC(unit);
908 u_char old_sc_irq; /* old printer IRQ status */
912 if(sc->sc_irq & LP_HAS_IRQ) {
915 * If the IRQ status is changed,
916 * this will only be visible on the
919 * If interrupt status changes,
920 * this gets syslog'd.
922 old_sc_irq = sc->sc_irq;
923 switch(*(int*)ap->a_data) {
925 sc->sc_irq &= (~LP_ENABLE_IRQ);
928 sc->sc_irq &= (~LP_ENABLE_EXT);
929 sc->sc_irq |= LP_ENABLE_IRQ;
932 /* classic irq based transfer and advanced
933 * modes are in conflict
935 sc->sc_irq &= (~LP_ENABLE_IRQ);
936 sc->sc_irq |= LP_ENABLE_EXT;
939 sc->sc_irq &= (~LP_ENABLE_EXT);
945 if (old_sc_irq != sc->sc_irq )
946 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n",
948 (sc->sc_irq & LP_ENABLE_IRQ)?
949 "interrupt-driven":"polled",
950 (sc->sc_irq & LP_ENABLE_EXT)?
951 "extended":"standard");
952 } else /* polled port */
963 * Because lpt is a static device that always exists under a ppbus device,
964 * and not scanned by the ppbus device, we need an identify function to
965 * install its device.
967 static device_method_t lpt_methods[] = {
968 /* device interface */
969 DEVMETHOD(device_identify, bus_generic_identify),
970 DEVMETHOD(device_probe, lpt_probe),
971 DEVMETHOD(device_attach, lpt_attach),
976 static driver_t lpt_driver = {
979 sizeof(struct lpt_data),
982 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0);