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 $
55 * Device Driver for AT parallel printer port
56 * Written by William Jolitz 12/18/90
60 * Updated for ppbus by Nicolas Souchu
66 #include <sys/param.h>
67 #include <sys/systm.h>
68 #include <sys/module.h>
71 #include <sys/kernel.h>
73 #include <sys/syslog.h>
74 #include <sys/malloc.h>
76 #include <machine/clock.h>
77 #include <machine/bus.h>
78 #include <machine/resource.h>
81 #include <dev/ppbus/lptio.h>
82 #include <dev/ppbus/ppbconf.h>
83 #include <dev/ppbus/ppb_1284.h>
84 #include <dev/ppbus/lpt.h>
86 #include <dev/ppbus/ppbio.h>
88 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers");
93 #define lprintf(args) \
98 static int volatile lptflag = 1;
101 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */
102 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
103 #define LPTOUTMAX 1 /* maximal timeout 1 s */
104 #define LPPRI (PZERO+8)
106 #define BUFSTATSIZE 32
108 #define LPTUNIT(s) ((s)&0x03)
109 #define LPTFLAGS(s) ((s)&0xfc)
114 /* default case: negative prime, negative ack, handshake strobe,
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 */
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 /* close */ lptclose,
198 /* write */ lptwrite,
199 /* ioctl */ lptioctl,
202 /* strategy */ nostrategy,
204 /* maj */ CDEV_MAJOR,
212 lpt_request_ppbus(device_t dev, int how)
214 device_t ppbus = device_get_parent(dev);
215 struct lpt_data *sc = DEVTOSOFTC(dev);
218 if (sc->sc_state & HAVEBUS)
221 /* we have the bus only if the request succeded */
222 if ((error = ppb_request_bus(ppbus, dev, how)) == 0)
223 sc->sc_state |= HAVEBUS;
229 lpt_release_ppbus(device_t dev)
231 device_t ppbus = device_get_parent(dev);
232 struct lpt_data *sc = DEVTOSOFTC(dev);
235 if ((error = ppb_release_bus(ppbus, dev)) == 0)
236 sc->sc_state &= ~HAVEBUS;
242 * Internal routine to lptprobe to do port tests of one byte value
245 lpt_port_test(device_t ppbus, u_char data, u_char mask)
250 ppb_wdtr(ppbus, data);
254 temp = ppb_rdtr(ppbus) & 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(device_t dev)
311 device_t ppbus = device_get_parent(dev);
313 static u_char testbyte[18] = {
314 0x55, /* alternating zeros */
315 0xaa, /* alternating ones */
316 0xfe, 0xfd, 0xfb, 0xf7,
317 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
318 0x01, 0x02, 0x04, 0x08,
319 0x10, 0x20, 0x40, 0x80 /* walking one */
321 int i, error, status;
323 status = 1; /* assume success */
325 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
326 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
331 for (i = 0; i < 18 && status; i++)
332 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) {
338 /* write 0's to control and data ports */
342 lpt_release_ppbus(dev);
348 lpt_identify(driver_t *driver, device_t parent)
351 BUS_ADD_CHILD(parent, 0, LPT_NAME, 0);
358 lpt_probe(device_t dev)
362 sc = DEVTOSOFTC(dev);
363 bzero(sc, sizeof(struct lpt_data));
366 * Now, try to detect the printer.
368 if (!lpt_detect(dev))
371 device_set_desc(dev, "Printer");
377 lpt_attach(device_t dev)
379 device_t ppbus = device_get_parent(dev);
380 struct lpt_data *sc = DEVTOSOFTC(dev);
381 int zero = 0, unit = device_get_unit(dev);
385 sc->sc_primed = 0; /* not primed yet */
387 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
388 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
392 ppb_wctr(ppbus, LPC_NINIT);
394 /* check if we can use interrupt, should be done by ppc stuff */
395 lprintf(("oldirq %x\n", sc->sc_irq));
397 /* retrieve the ppbus irq */
398 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq);
401 /* declare our interrupt handler */
402 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
403 &zero, irq, irq, 1, RF_SHAREABLE);
405 if (sc->intr_resource) {
406 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
407 device_printf(dev, "Interrupt-driven port\n");
410 device_printf(dev, "Polled port\n");
412 lprintf(("irq %x %x\n", irq, sc->sc_irq));
414 lpt_release_ppbus(dev);
416 make_dev(&lpt_cdevsw, unit,
417 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit);
418 make_dev(&lpt_cdevsw, unit | LP_BYPASS,
419 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit);
426 device_t dev = (device_t)arg;
427 struct lpt_data *sc = DEVTOSOFTC(dev);
429 device_t ppbus = device_get_parent(dev);
432 lprintf(("T %x ", ppb_rstr(ppbus)));
433 if (sc->sc_state & OPEN) {
435 if (sc->sc_backoff > hz/LPTOUTMAX)
436 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
437 timeout(lptout, (caddr_t)dev, sc->sc_backoff);
439 sc->sc_state &= ~TOUT;
441 if (sc->sc_state & EERROR)
442 sc->sc_state &= ~EERROR;
445 * Avoid possible hangs due to missed interrupts
447 if (sc->sc_xfercnt) {
450 sc->sc_state &= ~OBUSY;
451 wakeup((caddr_t)dev);
456 * lptopen -- reset the printer, then wait until it's selected and not busy.
457 * If LP_BYPASS flag is selected, then we do not try to select the
458 * printer -- this is just used for passing ioctls.
462 lptopen(dev_t dev, int flags, int fmt, struct proc *p)
466 u_int unit = LPTUNIT(minor(dev));
467 struct lpt_data *sc = UNITOSOFTC(unit);
468 device_t lptdev = UNITODEVICE(unit);
469 device_t ppbus = device_get_parent(lptdev);
475 lprintf((LPT_NAME ": still open %x\n", sc->sc_state));
478 sc->sc_state |= LPTINIT;
480 sc->sc_flags = LPTFLAGS(minor(dev));
482 /* Check for open with BYPASS flag set. */
483 if (sc->sc_flags & LP_BYPASS) {
488 /* request the ppbus only if we don't have it already */
489 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
490 /* give it a chance to try later */
496 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags));
498 /* set IRQ status according to ENABLE_IRQ flag
500 if (sc->sc_irq & LP_ENABLE_IRQ)
501 sc->sc_irq |= LP_USE_IRQ;
503 sc->sc_irq &= ~LP_USE_IRQ;
506 if ((sc->sc_flags & LP_NO_PRIME) == 0) {
507 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
514 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT);
516 /* wait till ready (printer running diagnostics) */
519 /* ran out of waiting for the printer */
520 if (trys++ >= LPINITRDY*4) {
523 lprintf(("status %x\n", ppb_rstr(ppbus)));
525 lpt_release_ppbus(lptdev);
529 /* wait 1/4 second, give up if we get a signal */
530 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, "lptinit", hz/4) !=
535 lpt_release_ppbus(lptdev);
539 /* is printer online and ready for output */
540 } while ((ppb_rstr(ppbus) &
541 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
542 (LPS_SEL|LPS_NBSY|LPS_NERR));
544 sc->sc_control = LPC_SEL|LPC_NINIT;
545 if (sc->sc_flags & LP_AUTOLF)
546 sc->sc_control |= LPC_AUTOL;
548 /* enable interrupt if interrupt-driven */
549 if (sc->sc_irq & LP_USE_IRQ)
550 sc->sc_control |= LPC_ENA;
552 ppb_wctr(ppbus, sc->sc_control);
555 sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK);
556 sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK);
560 /* release the ppbus */
561 lpt_release_ppbus(lptdev);
563 /* only use timeout if using interrupt */
564 lprintf(("irq %x\n", sc->sc_irq));
565 if (sc->sc_irq & LP_USE_IRQ) {
566 sc->sc_state |= TOUT;
567 timeout(lptout, (caddr_t)lptdev,
568 (sc->sc_backoff = hz/LPTOUTINITIAL));
571 lprintf(("opened.\n"));
576 * lptclose -- close the device, free the local line buffer.
578 * Check for interrupted write call added.
582 lptclose(dev_t dev, int flags, int fmt, struct proc *p)
584 u_int unit = LPTUNIT(minor(dev));
585 struct lpt_data *sc = UNITOSOFTC(unit);
586 device_t lptdev = UNITODEVICE(unit);
587 device_t ppbus = device_get_parent(lptdev);
590 if(sc->sc_flags & LP_BYPASS)
593 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
596 sc->sc_state &= ~OPEN;
598 /* if the last write was interrupted, don't complete it */
599 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
600 while ((ppb_rstr(ppbus) &
601 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
602 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
603 /* wait 1/4 second, give up if we get a signal */
604 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH,
605 "lpclose", hz) != EWOULDBLOCK)
608 ppb_wctr(ppbus, LPC_NINIT);
609 free(sc->sc_inbuf, M_LPT);
610 free(sc->sc_statbuf, M_LPT);
613 /* release the bus anyway
614 * unregistration of interrupt forced by release
616 lpt_release_ppbus(lptdev);
620 lprintf(("closed.\n"));
626 * Workhorse for actually spinning and writing bytes to printer
630 * This code is only used when we are polling the port
633 lpt_pushbytes(device_t dev)
635 struct lpt_data *sc = DEVTOSOFTC(dev);
636 device_t ppbus = device_get_parent(dev);
641 /* loop for every character .. */
642 while (sc->sc_xfercnt > 0) {
649 * Wait for printer ready.
650 * Loop 20 usecs testing BUSY bit, then sleep
651 * for exponentially increasing timeout. (vak)
653 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin)
654 DELAY(1); /* XXX delay is NOT this accurate! */
655 if (spin >= MAX_SPIN) {
657 while (NOT_READY(ppbus)) {
659 * Now sleep, every cycle a
664 * But no more than 10 seconds. (vak)
668 err = tsleep((caddr_t)dev, LPPRI,
669 LPT_NAME "poll", tic);
670 if (err != EWOULDBLOCK) {
679 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
680 ppb_wctr(ppbus, sc->sc_control);
687 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
691 lptread(dev_t dev, struct uio *uio, int ioflag)
693 u_int unit = LPTUNIT(minor(dev));
694 struct lpt_data *sc = UNITOSOFTC(unit);
695 device_t lptdev = UNITODEVICE(unit);
696 device_t ppbus = device_get_parent(lptdev);
699 if (sc->sc_flags & LP_BYPASS) {
700 /* we can't do reads in bypass mode */
704 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0)))
707 /* read data in an other buffer, read/write may be simultaneous */
709 while (uio->uio_resid) {
710 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE,
711 sc->sc_statbuf, min(BUFSTATSIZE,
712 uio->uio_resid), &len))) {
717 goto error; /* no more data */
719 if ((error = uiomove(sc->sc_statbuf, len, uio)))
724 ppb_1284_terminate(ppbus);
729 * lptwrite --copy a line from user space to a local buffer, then call
730 * putc to get the chars moved to the output queue.
732 * Flagging of interrupted write added.
736 lptwrite(dev_t dev, struct uio *uio, int ioflag)
740 u_int unit = LPTUNIT(minor(dev));
741 struct lpt_data *sc = UNITOSOFTC(unit);
742 device_t lptdev = UNITODEVICE(unit);
743 device_t ppbus = device_get_parent(lptdev);
745 if(sc->sc_flags & LP_BYPASS) {
746 /* we can't do writes in bypass mode */
750 /* request the ppbus only if we don't have it already */
751 /* XXX interrupt registration?! */
752 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
755 /* if interrupts are working, register the handler */
756 if (sc->sc_irq & LP_USE_IRQ) {
757 /* register our interrupt handler */
758 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource,
759 INTR_TYPE_TTY, lpt_intr, lptdev,
762 device_printf(lptdev, "handler registration failed, polled mode.\n");
763 sc->sc_irq &= ~LP_USE_IRQ;
767 sc->sc_state &= ~INTERRUPTED;
768 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
769 sc->sc_cp = sc->sc_inbuf;
770 uiomove(sc->sc_cp, n, uio);
773 if (sc->sc_irq & LP_ENABLE_EXT) {
774 /* try any extended mode */
775 err = ppb_write(ppbus, sc->sc_cp,
779 /* if not all data was sent, we could rely
780 * on polling for the last bytes */
784 sc->sc_state |= INTERRUPTED;
787 /* advanced mode not avail */
788 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit);
793 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
795 /* if the printer is ready for a char, */
797 if ((sc->sc_state & OBUSY) == 0){
798 lprintf(("\nC %d. ", sc->sc_xfercnt));
802 if (sc->sc_state & OBUSY)
803 if ((err = tsleep((caddr_t)lptdev,
804 LPPRI|PCATCH, LPT_NAME "write", 0))) {
805 sc->sc_state |= INTERRUPTED;
810 /* check to see if we must do a polled write */
811 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
814 err = lpt_pushbytes(lptdev);
821 /* we have not been interrupted, release the ppbus */
822 lpt_release_ppbus(lptdev);
828 * lpt_intr -- handle printer interrupts which occur when the printer is
829 * ready to accept another char.
831 * do checking for interrupted write call.
837 device_t lptdev = (device_t)arg;
838 device_t ppbus = device_get_parent(lptdev);
839 struct lpt_data *sc = DEVTOSOFTC(lptdev);
843 /* we must own the bus to use it */
844 if ((sc->sc_state & HAVEBUS) == 0)
848 * Is printer online and ready for output?
850 * Avoid falling back to lptout() too quickly. First spin-loop
851 * to see if the printer will become ready ``really soon now''.
853 for (i = 0; i < 100 &&
854 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ;
856 if ((sts & RDY_MASK) == LP_READY) {
857 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
858 sc->sc_backoff = hz/LPTOUTINITIAL;
860 if (sc->sc_xfercnt) {
862 /*lprintf(("%x ", *sc->sc_cp)); */
863 ppb_wdtr(ppbus, *sc->sc_cp++) ;
864 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
866 ppb_wctr(ppbus, sc->sc_control);
868 /* any more data for printer */
869 if(--(sc->sc_xfercnt) > 0) return;
873 * No more data waiting for printer.
874 * Wakeup is not done if write call was not interrupted.
876 sc->sc_state &= ~OBUSY;
878 if(!(sc->sc_state & INTERRUPTED))
879 wakeup((caddr_t)lptdev);
882 } else { /* check for error */
883 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
884 (sc->sc_state & OPEN))
885 sc->sc_state |= EERROR;
886 /* lptout() will jump in and try to restart. */
888 lprintf(("sts %x ", sts));
892 lptintr(device_t dev)
894 /* call the interrupt at required spl level */
904 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
907 u_int unit = LPTUNIT(minor(dev));
908 struct lpt_data *sc = UNITOSOFTC(unit);
909 u_char old_sc_irq; /* old printer IRQ status */
913 if(sc->sc_irq & LP_HAS_IRQ) {
916 * If the IRQ status is changed,
917 * this will only be visible on the
920 * If interrupt status changes,
921 * this gets syslog'd.
923 old_sc_irq = sc->sc_irq;
924 switch(*(int*)data) {
926 sc->sc_irq &= (~LP_ENABLE_IRQ);
929 sc->sc_irq &= (~LP_ENABLE_EXT);
930 sc->sc_irq |= LP_ENABLE_IRQ;
933 /* classic irq based transfer and advanced
934 * modes are in conflict
936 sc->sc_irq &= (~LP_ENABLE_IRQ);
937 sc->sc_irq |= LP_ENABLE_EXT;
940 sc->sc_irq &= (~LP_ENABLE_EXT);
946 if (old_sc_irq != sc->sc_irq )
947 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n",
949 (sc->sc_irq & LP_ENABLE_IRQ)?
950 "interrupt-driven":"polled",
951 (sc->sc_irq & LP_ENABLE_EXT)?
952 "extended":"standard");
953 } else /* polled port */
963 static device_method_t lpt_methods[] = {
964 /* device interface */
965 DEVMETHOD(device_identify, lpt_identify),
966 DEVMETHOD(device_probe, lpt_probe),
967 DEVMETHOD(device_attach, lpt_attach),
972 static driver_t lpt_driver = {
975 sizeof(struct lpt_data),
978 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0);