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
53 #include <sys/cdefs.h>
54 __FBSDID("$FreeBSD$");
57 * Device Driver for AT parallel printer port
58 * Written by William Jolitz 12/18/90
62 * Updated for ppbus by Nicolas Souchu
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/module.h>
73 #include <sys/kernel.h>
75 #include <sys/syslog.h>
76 #include <sys/malloc.h>
78 #include <machine/bus.h>
79 #include <machine/resource.h>
82 #include <dev/ppbus/lptio.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
109 struct cdev *sc_cdev;
110 struct cdev *sc_cdev_bypass;
112 /* default case: negative prime, negative ack, handshake strobe,
116 #define LP_POS_INIT 0x04 /* if we are a postive init signal */
117 #define LP_POS_ACK 0x08 /* if we are a positive going ack */
118 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */
119 #define LP_PRIMEOPEN 0x20 /* prime on every open */
120 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */
121 #define LP_BYPASS 0x80 /* bypass printer ready checks */
127 u_short sc_irq ; /* IRQ status of port */
128 #define LP_HAS_IRQ 0x01 /* we have an irq available */
129 #define LP_USE_IRQ 0x02 /* we are using our irq */
130 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */
131 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */
132 u_char sc_backoff ; /* time to call lptout() again */
133 struct callout sc_timer;
135 struct resource *sc_intr_resource; /* interrupt resource */
136 void *sc_intr_cookie; /* interrupt cookie */
139 #define LPT_NAME "lpt" /* our official name */
141 static timeout_t lptout;
142 static int lpt_port_test(device_t dev, u_char data, u_char mask);
143 static int lpt_detect(device_t dev);
145 #define DEVTOSOFTC(dev) \
146 ((struct lpt_data *)device_get_softc(dev))
148 static void lptintr(void *arg);
150 static devclass_t lpt_devclass;
154 #define OPEN (1<<0) /* device is open */
155 #define ASLP (1<<1) /* awaiting draining of printer */
156 #define EERROR (1<<2) /* error was received from printer */
157 #define OBUSY (1<<3) /* printer is busy doing output */
158 #define LPTOUT (1<<4) /* timeout while not selected */
159 #define TOUT (1<<5) /* timeout while not selected */
160 #define LPTINIT (1<<6) /* waiting to initialize for open */
161 #define INTERRUPTED (1<<7) /* write call was interrupted */
162 #define HAVEBUS (1<<8) /* the driver owns the bus */
164 /* status masks to interrogate printer status */
165 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
166 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
168 /* Printer Ready condition - from lpa.c */
169 /* Only used in polling code */
170 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR)
171 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR)
172 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK)
174 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
175 #define MAX_SPIN 20 /* Max delay for device ready in usecs */
178 static d_open_t lptopen;
179 static d_close_t lptclose;
180 static d_write_t lptwrite;
181 static d_read_t lptread;
182 static d_ioctl_t lptioctl;
184 static struct cdevsw lpt_cdevsw = {
185 .d_version = D_VERSION,
195 lpt_request_ppbus(device_t dev, int how)
197 device_t ppbus = device_get_parent(dev);
198 struct lpt_data *sc = DEVTOSOFTC(dev);
202 * We might already have the bus for a write(2) after an interrupted
205 ppb_assert_locked(ppbus);
206 if (sc->sc_state & HAVEBUS)
209 error = ppb_request_bus(ppbus, dev, how);
211 sc->sc_state |= HAVEBUS;
216 lpt_release_ppbus(device_t dev)
218 device_t ppbus = device_get_parent(dev);
219 struct lpt_data *sc = DEVTOSOFTC(dev);
222 ppb_assert_locked(ppbus);
223 if (sc->sc_state & HAVEBUS) {
224 error = ppb_release_bus(ppbus, dev);
226 sc->sc_state &= ~HAVEBUS;
232 * Internal routine to lptprobe to do port tests of one byte value
235 lpt_port_test(device_t ppbus, u_char data, u_char mask)
240 ppb_wdtr(ppbus, data);
244 temp = ppb_rdtr(ppbus) & mask;
246 while (temp != data && --timeout);
247 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout));
248 return (temp == data);
252 * Probe simplified by replacing multiple loops with a hardcoded
253 * test pattern - 1999/02/08 des@freebsd.org
255 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
256 * Based partially on Rod Grimes' printer probe
259 * 1) If no port address was given, use the bios detected ports
260 * and autodetect what ports the printers are on.
261 * 2) Otherwise, probe the data port at the address given,
262 * using the method in Rod Grimes' port probe.
263 * (Much code ripped off directly from Rod's probe.)
265 * Comments from Rod's probe:
267 * 1) You should be able to write to and read back the same value
268 * to the data port. Do an alternating zeros, alternating ones,
269 * walking zero, and walking one test to check for stuck bits.
271 * 2) You should be able to write to and read back the same value
272 * to the control port lower 5 bits, the upper 3 bits are reserved
273 * per the IBM PC technical reference manauls and different boards
274 * do different things with them. Do an alternating zeros, alternating
275 * ones, walking zero, and walking one test to check for stuck bits.
277 * Some printers drag the strobe line down when the are powered off
278 * so this bit has been masked out of the control port test.
280 * XXX Some printers may not like a fast pulse on init or strobe, I
281 * don't know at this point, if that becomes a problem these bits
282 * should be turned off in the mask byte for the control port test.
284 * We are finally left with a mask of 0x14, due to some printers
285 * being adamant about holding other bits high ........
287 * Before probing the control port, we write a 0 to the data port -
288 * If not, some printers chuck out garbage when the strobe line
291 * 3) Set the data and control ports to a value of 0
293 * This probe routine has been tested on Epson Lx-800, HP LJ3P,
294 * Epson FX-1170 and C.Itoh 8510RM
296 * Quick exit on fail added.
299 lpt_detect(device_t dev)
301 device_t ppbus = device_get_parent(dev);
303 static u_char testbyte[18] = {
304 0x55, /* alternating zeros */
305 0xaa, /* alternating ones */
306 0xfe, 0xfd, 0xfb, 0xf7,
307 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */
308 0x01, 0x02, 0x04, 0x08,
309 0x10, 0x20, 0x40, 0x80 /* walking one */
311 int i, error, status;
313 status = 1; /* assume success */
316 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
318 device_printf(dev, "cannot alloc ppbus (%d)!\n", error);
322 for (i = 0; i < 18 && status; i++)
323 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) {
328 /* write 0's to control and data ports */
332 lpt_release_ppbus(dev);
339 lpt_identify(driver_t *driver, device_t parent)
344 dev = device_find_child(parent, LPT_NAME, -1);
346 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1);
353 lpt_probe(device_t dev)
356 if (!lpt_detect(dev))
359 device_set_desc(dev, "Printer");
365 lpt_attach(device_t dev)
367 device_t ppbus = device_get_parent(dev);
368 struct lpt_data *sc = DEVTOSOFTC(dev);
369 int rid = 0, unit = device_get_unit(dev);
372 sc->sc_primed = 0; /* not primed yet */
373 ppb_init_callout(ppbus, &sc->sc_timer, 0);
376 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) {
378 device_printf(dev, "cannot alloc ppbus (%d)!\n", error);
382 ppb_wctr(ppbus, LPC_NINIT);
383 lpt_release_ppbus(dev);
386 /* declare our interrupt handler */
387 sc->sc_intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
389 if (sc->sc_intr_resource) {
390 error = bus_setup_intr(dev, sc->sc_intr_resource,
391 INTR_TYPE_TTY | INTR_MPSAFE, NULL, lptintr, sc,
392 &sc->sc_intr_cookie);
394 bus_release_resource(dev, SYS_RES_IRQ, rid,
395 sc->sc_intr_resource);
397 "Unable to register interrupt handler\n");
400 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
401 device_printf(dev, "Interrupt-driven port\n");
404 device_printf(dev, "Polled port\n");
406 lprintf(("irq %x\n", sc->sc_irq));
408 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK);
409 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK);
411 sc->sc_cdev = make_dev(&lpt_cdevsw, unit,
412 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit);
413 sc->sc_cdev->si_drv1 = sc;
414 sc->sc_cdev->si_drv2 = 0;
415 sc->sc_cdev_bypass = make_dev(&lpt_cdevsw, unit,
416 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit);
417 sc->sc_cdev_bypass->si_drv1 = sc;
418 sc->sc_cdev_bypass->si_drv2 = (void *)LP_BYPASS;
423 lpt_detach(device_t dev)
425 struct lpt_data *sc = DEVTOSOFTC(dev);
426 device_t ppbus = device_get_parent(dev);
428 destroy_dev(sc->sc_cdev);
429 destroy_dev(sc->sc_cdev_bypass);
431 lpt_release_ppbus(dev);
433 callout_drain(&sc->sc_timer);
434 if (sc->sc_intr_resource != NULL) {
435 bus_teardown_intr(dev, sc->sc_intr_resource,
437 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_intr_resource);
439 free(sc->sc_inbuf, M_DEVBUF);
440 free(sc->sc_statbuf, M_DEVBUF);
448 struct lpt_data *sc = arg;
449 device_t dev = sc->sc_dev;
450 #if defined(INVARIANTS) || defined(LPT_DEBUG)
451 device_t ppbus = device_get_parent(dev);
454 ppb_assert_locked(ppbus);
455 lprintf(("T %x ", ppb_rstr(ppbus)));
456 if (sc->sc_state & OPEN) {
458 if (sc->sc_backoff > hz/LPTOUTMAX)
459 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
460 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc);
462 sc->sc_state &= ~TOUT;
464 if (sc->sc_state & EERROR)
465 sc->sc_state &= ~EERROR;
468 * Avoid possible hangs due to missed interrupts
470 if (sc->sc_xfercnt) {
473 sc->sc_state &= ~OBUSY;
479 * lptopen -- reset the printer, then wait until it's selected and not busy.
480 * If LP_BYPASS flag is selected, then we do not try to select the
481 * printer -- this is just used for passing ioctls.
485 lptopen(struct cdev *dev, int flags, int fmt, struct thread *td)
488 struct lpt_data *sc = dev->si_drv1;
489 device_t lptdev = sc->sc_dev;
490 device_t ppbus = device_get_parent(lptdev);
497 lprintf(("%s: still open %x\n", device_get_nameunit(lptdev),
502 sc->sc_state |= LPTINIT;
504 sc->sc_flags = (uintptr_t)dev->si_drv2;
506 /* Check for open with BYPASS flag set. */
507 if (sc->sc_flags & LP_BYPASS) {
513 /* request the ppbus only if we don't have it already */
514 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
515 /* give it a chance to try later */
521 lprintf(("%s flags 0x%x\n", device_get_nameunit(lptdev),
524 /* set IRQ status according to ENABLE_IRQ flag
526 if (sc->sc_irq & LP_ENABLE_IRQ)
527 sc->sc_irq |= LP_USE_IRQ;
529 sc->sc_irq &= ~LP_USE_IRQ;
532 if ((sc->sc_flags & LP_NO_PRIME) == 0) {
533 if ((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) {
540 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT);
542 /* wait till ready (printer running diagnostics) */
545 /* ran out of waiting for the printer */
546 if (trys++ >= LPINITRDY*4) {
547 lprintf(("status %x\n", ppb_rstr(ppbus)));
549 lpt_release_ppbus(lptdev);
555 /* wait 1/4 second, give up if we get a signal */
556 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lptinit",
557 hz / 4) != EWOULDBLOCK) {
558 lpt_release_ppbus(lptdev);
564 /* is printer online and ready for output */
565 } while ((ppb_rstr(ppbus) &
566 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
567 (LPS_SEL|LPS_NBSY|LPS_NERR));
569 sc->sc_control = LPC_SEL|LPC_NINIT;
570 if (sc->sc_flags & LP_AUTOLF)
571 sc->sc_control |= LPC_AUTOL;
573 /* enable interrupt if interrupt-driven */
574 if (sc->sc_irq & LP_USE_IRQ)
575 sc->sc_control |= LPC_ENA;
577 ppb_wctr(ppbus, sc->sc_control);
579 sc->sc_state &= ~LPTINIT;
580 sc->sc_state |= OPEN;
583 /* only use timeout if using interrupt */
584 lprintf(("irq %x\n", sc->sc_irq));
585 if (sc->sc_irq & LP_USE_IRQ) {
586 sc->sc_state |= TOUT;
587 sc->sc_backoff = hz / LPTOUTINITIAL;
588 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc);
591 /* release the ppbus */
592 lpt_release_ppbus(lptdev);
595 lprintf(("opened.\n"));
600 * lptclose -- close the device, free the local line buffer.
602 * Check for interrupted write call added.
606 lptclose(struct cdev *dev, int flags, int fmt, struct thread *td)
608 struct lpt_data *sc = dev->si_drv1;
609 device_t lptdev = sc->sc_dev;
610 device_t ppbus = device_get_parent(lptdev);
614 if (sc->sc_flags & LP_BYPASS)
617 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
622 /* if the last write was interrupted, don't complete it */
623 if ((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ))
624 while ((ppb_rstr(ppbus) &
625 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) !=
626 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt)
627 /* wait 1/4 second, give up if we get a signal */
628 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lpclose",
632 sc->sc_state &= ~OPEN;
633 callout_stop(&sc->sc_timer);
634 ppb_wctr(ppbus, LPC_NINIT);
637 * unregistration of interrupt forced by release
639 lpt_release_ppbus(lptdev);
645 lprintf(("closed.\n"));
651 * Workhorse for actually spinning and writing bytes to printer
655 * This code is only used when we are polling the port
658 lpt_pushbytes(struct lpt_data *sc)
660 device_t dev = sc->sc_dev;
661 device_t ppbus = device_get_parent(dev);
665 ppb_assert_locked(ppbus);
667 /* loop for every character .. */
668 while (sc->sc_xfercnt > 0) {
675 * Wait for printer ready.
676 * Loop 20 usecs testing BUSY bit, then sleep
677 * for exponentially increasing timeout. (vak)
679 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin)
680 DELAY(1); /* XXX delay is NOT this accurate! */
681 if (spin >= MAX_SPIN) {
683 while (NOT_READY(ppbus)) {
685 * Now sleep, every cycle a
690 * But no more than 10 seconds. (vak)
694 err = ppb_sleep(ppbus, dev, LPPRI,
695 LPT_NAME "poll", tic);
696 if (err != EWOULDBLOCK) {
705 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
706 ppb_wctr(ppbus, sc->sc_control);
713 * lptread --retrieve printer status in IEEE1284 NIBBLE mode
717 lptread(struct cdev *dev, struct uio *uio, int ioflag)
719 struct lpt_data *sc = dev->si_drv1;
720 device_t lptdev = sc->sc_dev;
721 device_t ppbus = device_get_parent(lptdev);
724 if (sc->sc_flags & LP_BYPASS) {
725 /* we can't do reads in bypass mode */
730 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) {
735 /* read data in an other buffer, read/write may be simultaneous */
737 while (uio->uio_resid) {
738 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE,
739 sc->sc_statbuf, min(BUFSTATSIZE,
740 uio->uio_resid), &len))) {
745 goto error; /* no more data */
748 error = uiomove(sc->sc_statbuf, len, uio);
755 ppb_1284_terminate(ppbus);
761 * lptwrite --copy a line from user space to a local buffer, then call
762 * putc to get the chars moved to the output queue.
764 * Flagging of interrupted write added.
768 lptwrite(struct cdev *dev, struct uio *uio, int ioflag)
772 struct lpt_data *sc = dev->si_drv1;
773 device_t lptdev = sc->sc_dev;
774 device_t ppbus = device_get_parent(lptdev);
776 if (sc->sc_flags & LP_BYPASS) {
777 /* we can't do writes in bypass mode */
781 /* request the ppbus only if we don't have it already */
783 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) {
788 sc->sc_state &= ~INTERRUPTED;
789 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
790 sc->sc_cp = sc->sc_inbuf;
792 err = uiomove(sc->sc_cp, n, uio);
798 if (sc->sc_irq & LP_ENABLE_EXT) {
799 /* try any extended mode */
800 err = ppb_write(ppbus, sc->sc_cp,
804 /* if not all data was sent, we could rely
805 * on polling for the last bytes */
809 sc->sc_state |= INTERRUPTED;
813 /* advanced mode not avail */
815 "%s: advanced mode not avail, polling\n",
816 device_get_nameunit(sc->sc_dev));
822 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
824 /* if the printer is ready for a char, */
826 if ((sc->sc_state & OBUSY) == 0){
827 lprintf(("\nC %d. ", sc->sc_xfercnt));
831 if (sc->sc_state & OBUSY)
832 if ((err = ppb_sleep(ppbus, lptdev,
833 LPPRI|PCATCH, LPT_NAME "write", 0))) {
834 sc->sc_state |= INTERRUPTED;
840 /* check to see if we must do a polled write */
841 if (!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
844 err = lpt_pushbytes(sc);
853 /* we have not been interrupted, release the ppbus */
854 lpt_release_ppbus(lptdev);
861 * lptintr -- handle printer interrupts which occur when the printer is
862 * ready to accept another char.
864 * do checking for interrupted write call.
869 struct lpt_data *sc = arg;
870 device_t lptdev = sc->sc_dev;
871 device_t ppbus = device_get_parent(lptdev);
876 * Is printer online and ready for output?
878 * Avoid falling back to lptout() too quickly. First spin-loop
879 * to see if the printer will become ready ``really soon now''.
881 for (i = 0; i < 100 &&
882 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ;
884 if ((sts & RDY_MASK) == LP_READY) {
885 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR;
886 sc->sc_backoff = hz / LPTOUTINITIAL;
888 if (sc->sc_xfercnt) {
890 /*lprintf(("%x ", *sc->sc_cp)); */
891 ppb_wdtr(ppbus, *sc->sc_cp++) ;
892 ppb_wctr(ppbus, sc->sc_control|LPC_STB);
894 ppb_wctr(ppbus, sc->sc_control);
896 /* any more data for printer */
897 if (--(sc->sc_xfercnt) > 0)
902 * No more data waiting for printer.
903 * Wakeup is not done if write call was not interrupted.
905 sc->sc_state &= ~OBUSY;
907 if (!(sc->sc_state & INTERRUPTED))
911 } else { /* check for error */
912 if (((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) &&
913 (sc->sc_state & OPEN))
914 sc->sc_state |= EERROR;
915 /* lptout() will jump in and try to restart. */
917 lprintf(("sts %x ", sts));
921 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
924 struct lpt_data *sc = dev->si_drv1;
926 u_char old_sc_irq; /* old printer IRQ status */
930 ppbus = device_get_parent(sc->sc_dev);
932 if (sc->sc_irq & LP_HAS_IRQ) {
935 * If the IRQ status is changed,
936 * this will only be visible on the
939 * If interrupt status changes,
940 * this gets syslog'd.
942 old_sc_irq = sc->sc_irq;
943 switch (*(int*)data) {
945 sc->sc_irq &= (~LP_ENABLE_IRQ);
948 sc->sc_irq &= (~LP_ENABLE_EXT);
949 sc->sc_irq |= LP_ENABLE_IRQ;
952 /* classic irq based transfer and advanced
953 * modes are in conflict
955 sc->sc_irq &= (~LP_ENABLE_IRQ);
956 sc->sc_irq |= LP_ENABLE_EXT;
959 sc->sc_irq &= (~LP_ENABLE_EXT);
965 if (old_sc_irq != sc->sc_irq )
966 log(LOG_NOTICE, "%s: switched to %s %s mode\n",
967 device_get_nameunit(sc->sc_dev),
968 (sc->sc_irq & LP_ENABLE_IRQ)?
969 "interrupt-driven":"polled",
970 (sc->sc_irq & LP_ENABLE_EXT)?
971 "extended":"standard");
972 } else /* polled port */
983 static device_method_t lpt_methods[] = {
984 /* device interface */
985 DEVMETHOD(device_identify, lpt_identify),
986 DEVMETHOD(device_probe, lpt_probe),
987 DEVMETHOD(device_attach, lpt_attach),
988 DEVMETHOD(device_detach, lpt_detach),
993 static driver_t lpt_driver = {
996 sizeof(struct lpt_data),
999 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0);
1000 MODULE_DEPEND(lpt, ppbus, 1, 1, 1);