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
66 #include <sys/param.h>
67 #include <sys/systm.h>
68 #include <sys/module.h>
72 #include <sys/kernel.h>
74 #include <sys/syslog.h>
76 #include <machine/clock.h>
77 #include <machine/bus.h>
78 #include <machine/resource.h>
81 #include <machine/lpt.h>
83 #include <dev/ppbus/ppbconf.h>
84 #include <dev/ppbus/ppb_1284.h>
85 #include <dev/ppbus/lpt.h>
87 #include <dev/ppbus/ppbio.h>
92 #define lprintf(args) \
97 static int volatile lptflag = 1;
100 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */
101 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
102 #define LPTOUTMAX 1 /* maximal timeout 1 s */
103 #define LPPRI (PZERO+8)
105 #define BUFSTATSIZE 32
107 #define LPTUNIT(s) ((s)&0x03)
108 #define LPTFLAGS(s) ((s)&0xfc)
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 */
135 struct resource *intr_resource; /* interrupt resource */
136 void *intr_cookie; /* interrupt registration cookie */
140 #define LPT_NAME "lpt" /* our official name */
142 static timeout_t lptout;
143 static int lpt_port_test(device_t dev, u_char data, u_char mask);
144 static int lpt_detect(device_t dev);
146 #define DEVTOSOFTC(dev) \
147 ((struct lpt_data *)device_get_softc(dev))
148 #define UNITOSOFTC(unit) \
149 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit)))
150 #define UNITODEVICE(unit) \
151 (devclass_get_device(lpt_devclass, (unit)))
153 static void lptintr(device_t dev);
154 static void lpt_intr(void *arg); /* without spls */
156 static devclass_t lpt_devclass;
160 #define OPEN (1<<0) /* device is open */
161 #define ASLP (1<<1) /* awaiting draining of printer */
162 #define EERROR (1<<2) /* error was received from printer */
163 #define OBUSY (1<<3) /* printer is busy doing output */
164 #define LPTOUT (1<<4) /* timeout while not selected */
165 #define TOUT (1<<5) /* timeout while not selected */
166 #define LPTINIT (1<<6) /* waiting to initialize for open */
167 #define INTERRUPTED (1<<7) /* write call was interrupted */
169 #define HAVEBUS (1<<8) /* the driver owns the bus */
172 /* status masks to interrogate printer status */
173 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
174 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
176 /* Printer Ready condition - from lpa.c */
177 /* Only used in polling code */
178 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
179 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
180 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK)
182 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
183 #define MAX_SPIN 20 /* Max delay for device ready in usecs */
186 static d_open_t lptopen;
187 static d_close_t lptclose;
188 static d_write_t lptwrite;
189 static d_read_t lptread;
190 static d_ioctl_t lptioctl;
192 #define CDEV_MAJOR 16
193 static struct cdevsw lpt_cdevsw = {
195 /* close */ lptclose,
197 /* write */ lptwrite,
198 /* ioctl */ lptioctl,
201 /* strategy */ nostrategy,
203 /* maj */ CDEV_MAJOR,
211 lpt_request_ppbus(device_t dev, int how)
213 device_t ppbus = device_get_parent(dev);
214 struct lpt_data *sc = DEVTOSOFTC(dev);
217 if (sc->sc_state & HAVEBUS)
220 /* we have the bus only if the request succeded */
221 if ((error = ppb_request_bus(ppbus, dev, how)) == 0)
222 sc->sc_state |= HAVEBUS;
228 lpt_release_ppbus(device_t dev)
230 device_t ppbus = device_get_parent(dev);
231 struct lpt_data *sc = DEVTOSOFTC(dev);
234 if ((error = ppb_release_bus(ppbus, dev)) == 0)
235 sc->sc_state &= ~HAVEBUS;
241 * Internal routine to lptprobe to do port tests of one byte value
244 lpt_port_test(device_t ppbus, u_char data, u_char mask)
249 ppb_wdtr(ppbus, data);
253 temp = ppb_rdtr(ppbus) & mask;
255 while (temp != data && --timeout);
256 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
257 return (temp == data);
261 * Probe simplified by replacing multiple loops with a hardcoded
262 * test pattern - 1999/02/08 des@freebsd.org
264 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
265 * Based partially on Rod Grimes' printer probe
268 * 1) If no port address was given, use the bios detected ports
269 * and autodetect what ports the printers are on.
270 * 2) Otherwise, probe the data port at the address given,
271 * using the method in Rod Grimes' port probe.
272 * (Much code ripped off directly from Rod's probe.)
274 * Comments from Rod's probe:
276 * 1) You should be able to write to and read back the same value
277 * to the data port. Do an alternating zeros, alternating ones,
278 * walking zero, and walking one test to check for stuck bits.
280 * 2) You should be able to write to and read back the same value
281 * to the control port lower 5 bits, the upper 3 bits are reserved
282 * per the IBM PC technical reference manauls and different boards
283 * do different things with them. Do an alternating zeros, alternating
284 * ones, walking zero, and walking one test to check for stuck bits.
286 * Some printers drag the strobe line down when the are powered off
287 * so this bit has been masked out of the control port test.
289 * XXX Some printers may not like a fast pulse on init or strobe, I
290 * don't know at this point, if that becomes a problem these bits
291 * should be turned off in the mask byte for the control port test.
293 * We are finally left with a mask of 0x14, due to some printers
294 * being adamant about holding other bits high ........
296 * Before probing the control port, we write a 0 to the data port -
297 * If not, some printers chuck out garbage when the strobe line
300 * 3) Set the data and control ports to a value of 0
302 * This probe routine has been tested on Epson Lx-800, HP LJ3P,
303 * Epson FX-1170 and C.Itoh 8510RM
305 * Quick exit on fail added.
308 lpt_detect(device_t dev)
310 device_t ppbus = device_get_parent(dev);
312 static u_char testbyte[18] = {
313 0x55, /* alternating zeros */
314 0xaa, /* alternating ones */
315 0xfe, 0xfd, 0xfb, 0xf7,
316 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
317 0x01, 0x02, 0x04, 0x08,
318 0x10, 0x20, 0x40, 0x80 /* walking one */
320 int i, error, status;
322 status = 1; /* assume success */
324 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
325 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
330 for (i = 0; i < 18 && status; i++)
331 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) {
337 /* write 0's to control and data ports */
341 lpt_release_ppbus(dev);
347 lpt_identify(driver_t *driver, device_t parent)
350 BUS_ADD_CHILD(parent, 0, LPT_NAME, 0);
357 lpt_probe(device_t dev)
361 sc = DEVTOSOFTC(dev);
362 bzero(sc, sizeof(struct lpt_data));
365 * Now, try to detect the printer.
367 if (!lpt_detect(dev))
370 device_set_desc(dev, "Printer");
376 lpt_attach(device_t dev)
378 device_t ppbus = device_get_parent(dev);
379 struct lpt_data *sc = DEVTOSOFTC(dev);
380 int zero = 0, irq, unit = device_get_unit(dev);
383 sc->sc_primed = 0; /* not primed yet */
385 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
386 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error);
390 ppb_wctr(ppbus, LPC_NINIT);
392 /* check if we can use interrupt, should be done by ppc stuff */
393 lprintf(("oldirq %x\n", sc->sc_irq));
395 /* retrieve the ppbus irq */
396 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq);
399 /* declare our interrupt handler */
400 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ,
401 &zero, irq, irq, 1, RF_SHAREABLE);
403 if (sc->intr_resource) {
404 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
405 device_printf(dev, "Interrupt-driven port\n");
408 device_printf(dev, "Polled port\n");
410 lprintf(("irq %x %x\n", irq, sc->sc_irq));
412 lpt_release_ppbus(dev);
414 make_dev(&lpt_cdevsw, unit,
415 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit);
416 make_dev(&lpt_cdevsw, unit | LP_BYPASS,
417 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit);
424 device_t dev = (device_t)arg;
425 struct lpt_data *sc = DEVTOSOFTC(dev);
427 device_t ppbus = device_get_parent(dev);
430 lprintf(("T %x ", ppb_rstr(ppbus)));
431 if (sc->sc_state & OPEN) {
433 if (sc->sc_backoff > hz/LPTOUTMAX)
434 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
435 timeout(lptout, (caddr_t)dev, sc->sc_backoff);
437 sc->sc_state &= ~TOUT;
439 if (sc->sc_state & EERROR)
440 sc->sc_state &= ~EERROR;
443 * Avoid possible hangs due to missed interrupts
445 if (sc->sc_xfercnt) {
448 sc->sc_state &= ~OBUSY;
449 wakeup((caddr_t)dev);
454 * lptopen -- reset the printer, then wait until it's selected and not busy.
455 * If LP_BYPASS flag is selected, then we do not try to select the
456 * printer -- this is just used for passing ioctls.
460 lptopen(dev_t dev, int flags, int fmt, struct proc *p)
464 u_int unit = LPTUNIT(minor(dev));
465 struct lpt_data *sc = UNITOSOFTC(unit);
466 device_t lptdev = UNITODEVICE(unit);
467 device_t ppbus = device_get_parent(lptdev);
473 lprintf((LPT_NAME ": still open %x\n", sc->sc_state));
476 sc->sc_state |= LPTINIT;
478 sc->sc_flags = LPTFLAGS(minor(dev));
480 /* Check for open with BYPASS flag set. */
481 if (sc->sc_flags & LP_BYPASS) {
486 /* request the ppbus only if we don't have it already */
487 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
488 /* give it a chance to try later */
494 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags));
496 /* set IRQ status according to ENABLE_IRQ flag
498 if (sc->sc_irq & LP_ENABLE_IRQ)
499 sc->sc_irq |= LP_USE_IRQ;
501 sc->sc_irq &= ~LP_USE_IRQ;
504 if ((sc->sc_flags & LP_NO_PRIME) == 0) {
505 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
512 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT);
514 /* wait till ready (printer running diagnostics) */
517 /* ran out of waiting for the printer */
518 if (trys++ >= LPINITRDY*4) {
521 lprintf(("status %x\n", ppb_rstr(ppbus)));
523 lpt_release_ppbus(lptdev);
527 /* wait 1/4 second, give up if we get a signal */
528 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, "lptinit", hz/4) !=
533 lpt_release_ppbus(lptdev);
537 /* is printer online and ready for output */
538 } while ((ppb_rstr(ppbus) &
539 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
540 (LPS_SEL|LPS_NBSY|LPS_NERR));
542 sc->sc_control = LPC_SEL|LPC_NINIT;
543 if (sc->sc_flags & LP_AUTOLF)
544 sc->sc_control |= LPC_AUTOL;
546 /* enable interrupt if interrupt-driven */
547 if (sc->sc_irq & LP_USE_IRQ)
548 sc->sc_control |= LPC_ENA;
550 ppb_wctr(ppbus, sc->sc_control);
553 sc->sc_inbuf = geteblk(BUFSIZE);
554 sc->sc_statbuf = geteblk(BUFSTATSIZE);
558 /* release the ppbus */
559 lpt_release_ppbus(lptdev);
561 /* only use timeout if using interrupt */
562 lprintf(("irq %x\n", sc->sc_irq));
563 if (sc->sc_irq & LP_USE_IRQ) {
564 sc->sc_state |= TOUT;
565 timeout(lptout, (caddr_t)lptdev,
566 (sc->sc_backoff = hz/LPTOUTINITIAL));
569 lprintf(("opened.\n"));
574 * lptclose -- close the device, free the local line buffer.
576 * Check for interrupted write call added.
580 lptclose(dev_t dev, int flags, int fmt, struct proc *p)
582 u_int unit = LPTUNIT(minor(dev));
583 struct lpt_data *sc = UNITOSOFTC(unit);
584 device_t lptdev = UNITODEVICE(unit);
585 device_t ppbus = device_get_parent(lptdev);
588 if(sc->sc_flags & LP_BYPASS)
591 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
594 sc->sc_state &= ~OPEN;
596 /* if the last write was interrupted, don't complete it */
597 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
598 while ((ppb_rstr(ppbus) &
599 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
600 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
601 /* wait 1/4 second, give up if we get a signal */
602 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH,
603 "lpclose", hz) != EWOULDBLOCK)
606 ppb_wctr(ppbus, LPC_NINIT);
607 brelse(sc->sc_inbuf);
608 brelse(sc->sc_statbuf);
611 /* release the bus anyway
612 * unregistration of interrupt forced by release
614 lpt_release_ppbus(lptdev);
618 lprintf(("closed.\n"));
624 * Workhorse for actually spinning and writing bytes to printer
628 * This code is only used when we are polling the port
631 lpt_pushbytes(device_t dev)
633 struct lpt_data *sc = DEVTOSOFTC(dev);
634 device_t ppbus = device_get_parent(dev);
639 /* loop for every character .. */
640 while (sc->sc_xfercnt > 0) {
647 * Wait for printer ready.
648 * Loop 20 usecs testing BUSY bit, then sleep
649 * for exponentially increasing timeout. (vak)
651 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin)
652 DELAY(1); /* XXX delay is NOT this accurate! */
653 if (spin >= MAX_SPIN) {
655 while (NOT_READY(ppbus)) {
657 * Now sleep, every cycle a
662 * But no more than 10 seconds. (vak)
666 err = tsleep((caddr_t)dev, LPPRI,
667 LPT_NAME "poll", tic);
668 if (err != EWOULDBLOCK) {
677 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
678 ppb_wctr(ppbus, sc->sc_control);
685 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
689 lptread(dev_t dev, struct uio *uio, int ioflag)
691 u_int unit = LPTUNIT(minor(dev));
692 struct lpt_data *sc = UNITOSOFTC(unit);
693 device_t lptdev = UNITODEVICE(unit);
694 device_t ppbus = device_get_parent(lptdev);
697 if ((error = ppb_1284_negociate(ppbus, 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(ppbus, 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(ppbus);
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 = UNITOSOFTC(unit);
735 device_t lptdev = UNITODEVICE(unit);
736 device_t ppbus = device_get_parent(lptdev);
738 if(sc->sc_flags & LP_BYPASS) {
739 /* we can't do writes in bypass mode */
743 /* request the ppbus only if we don't have it already */
744 /* XXX interrupt registration?! */
745 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0)
748 /* if interrupts are working, register the handler */
749 if (sc->sc_irq & LP_USE_IRQ) {
750 /* register our interrupt handler */
751 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource,
752 INTR_TYPE_TTY, lpt_intr, lptdev,
755 device_printf(lptdev, "handler registration failed, polled mode.\n");
756 sc->sc_irq &= ~LP_USE_IRQ;
760 sc->sc_state &= ~INTERRUPTED;
761 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
762 sc->sc_cp = sc->sc_inbuf->b_data ;
763 uiomove(sc->sc_cp, n, uio);
766 if (sc->sc_irq & LP_ENABLE_EXT) {
767 /* try any extended mode */
768 err = ppb_write(ppbus, sc->sc_cp,
772 /* if not all data was sent, we could rely
773 * on polling for the last bytes */
777 sc->sc_state |= INTERRUPTED;
780 /* advanced mode not avail */
781 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit);
786 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
788 /* if the printer is ready for a char, */
790 if ((sc->sc_state & OBUSY) == 0){
791 lprintf(("\nC %d. ", sc->sc_xfercnt));
795 if (sc->sc_state & OBUSY)
796 if ((err = tsleep((caddr_t)lptdev,
797 LPPRI|PCATCH, LPT_NAME "write", 0))) {
798 sc->sc_state |= INTERRUPTED;
803 /* check to see if we must do a polled write */
804 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
807 err = lpt_pushbytes(lptdev);
814 /* we have not been interrupted, release the ppbus */
815 lpt_release_ppbus(lptdev);
821 * lpt_intr -- handle printer interrupts which occur when the printer is
822 * ready to accept another char.
824 * do checking for interrupted write call.
830 device_t lptdev = (device_t)arg;
831 device_t ppbus = device_get_parent(lptdev);
832 struct lpt_data *sc = DEVTOSOFTC(lptdev);
836 /* we must own the bus to use it */
837 if ((sc->sc_state & HAVEBUS) == 0)
841 * Is printer online and ready for output?
843 * Avoid falling back to lptout() too quickly. First spin-loop
844 * to see if the printer will become ready ``really soon now''.
846 for (i = 0; i < 100 &&
847 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ;
849 if ((sts & RDY_MASK) == LP_READY) {
850 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
851 sc->sc_backoff = hz/LPTOUTINITIAL;
853 if (sc->sc_xfercnt) {
855 /*lprintf(("%x ", *sc->sc_cp)); */
856 ppb_wdtr(ppbus, *sc->sc_cp++) ;
857 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
859 ppb_wctr(ppbus, sc->sc_control);
861 /* any more data for printer */
862 if(--(sc->sc_xfercnt) > 0) return;
866 * No more data waiting for printer.
867 * Wakeup is not done if write call was interrupted.
869 sc->sc_state &= ~OBUSY;
871 if(!(sc->sc_state & INTERRUPTED))
875 } else { /* check for error */
876 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
877 (sc->sc_state & OPEN))
878 sc->sc_state |= EERROR;
879 /* lptout() will jump in and try to restart. */
881 lprintf(("sts %x ", sts));
885 lptintr(device_t dev)
887 /* call the interrupt at required spl level */
897 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p)
900 u_int unit = LPTUNIT(minor(dev));
901 struct lpt_data *sc = UNITOSOFTC(unit);
902 u_char old_sc_irq; /* old printer IRQ status */
906 if(sc->sc_irq & LP_HAS_IRQ) {
909 * If the IRQ status is changed,
910 * this will only be visible on the
913 * If interrupt status changes,
914 * this gets syslog'd.
916 old_sc_irq = sc->sc_irq;
917 switch(*(int*)data) {
919 sc->sc_irq &= (~LP_ENABLE_IRQ);
922 sc->sc_irq &= (~LP_ENABLE_EXT);
923 sc->sc_irq |= LP_ENABLE_IRQ;
926 /* classic irq based transfer and advanced
927 * modes are in conflict
929 sc->sc_irq &= (~LP_ENABLE_IRQ);
930 sc->sc_irq |= LP_ENABLE_EXT;
933 sc->sc_irq &= (~LP_ENABLE_EXT);
939 if (old_sc_irq != sc->sc_irq )
940 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n",
942 (sc->sc_irq & LP_ENABLE_IRQ)?
943 "interrupt-driven":"polled",
944 (sc->sc_irq & LP_ENABLE_EXT)?
945 "extended":"standard");
946 } else /* polled port */
956 static device_method_t lpt_methods[] = {
957 /* device interface */
958 DEVMETHOD(device_identify, lpt_identify),
959 DEVMETHOD(device_probe, lpt_probe),
960 DEVMETHOD(device_attach, lpt_attach),
965 static driver_t lpt_driver = {
968 sizeof(struct lpt_data),
971 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0);