FreeBSD/Linux Kernel Cross Reference
sys/pc98/cbus/olpt.c
1 /*-
2 * Copyright (c) 1990 William F. Jolitz, TeleMuse
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
20 *
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.
26 *
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.
35 *
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
46 * SUCH DAMAGE.
47 *
48 * from: unknown origin, 386BSD 0.1
49 * $FreeBSD$
50 */
51
52 /*
53 * Device Driver for AT parallel printer port
54 * Written by William Jolitz 12/18/90
55 */
56
57 /*
58 * Parallel port TCP/IP interfaces added. I looked at the driver from
59 * MACH but this is a complete rewrite, and btw. incompatible, and it
60 * should perform better too. I have never run the MACH driver though.
61 *
62 * This driver sends two bytes (0x08, 0x00) in front of each packet,
63 * to allow us to distinguish another format later.
64 *
65 * Now added a Linux/Crynwr compatibility mode which is enabled using
66 * IF_LINK0 - Tim Wilkinson.
67 *
68 * TODO:
69 * Make HDLC/PPP mode, use IF_LLC1 to enable.
70 *
71 * Connect the two computers using a Laplink parallel cable to use this
72 * feature:
73 *
74 * +----------------------------------------+
75 * |A-name A-End B-End Descr. Port/Bit |
76 * +----------------------------------------+
77 * |DATA0 2 15 Data 0/0x01 |
78 * |-ERROR 15 2 1/0x08 |
79 * +----------------------------------------+
80 * |DATA1 3 13 Data 0/0x02 |
81 * |+SLCT 13 3 1/0x10 |
82 * +----------------------------------------+
83 * |DATA2 4 12 Data 0/0x04 |
84 * |+PE 12 4 1/0x20 |
85 * +----------------------------------------+
86 * |DATA3 5 10 Strobe 0/0x08 |
87 * |-ACK 10 5 1/0x40 |
88 * +----------------------------------------+
89 * |DATA4 6 11 Data 0/0x10 |
90 * |BUSY 11 6 1/~0x80 |
91 * +----------------------------------------+
92 * |GND 18-25 18-25 GND - |
93 * +----------------------------------------+
94 *
95 * Expect transfer-rates up to 75 kbyte/sec.
96 *
97 * If GCC could correctly grok
98 * register int port asm("edx")
99 * the code would be cleaner
100 *
101 * Poul-Henning Kamp <phk@freebsd.org>
102 */
103
104 #include <sys/param.h>
105 #include <sys/systm.h>
106 #include <sys/conf.h>
107 #include <sys/bus.h>
108 #include <sys/kernel.h>
109 #include <sys/module.h>
110 #include <sys/uio.h>
111 #include <sys/syslog.h>
112 #include <sys/malloc.h>
113
114 #include <machine/bus.h>
115 #include <machine/resource.h>
116 #include <sys/rman.h>
117
118 #include <isa/isavar.h>
119
120 #include <pc98/cbus/olptreg.h>
121 #include <dev/ppbus/lptio.h>
122
123 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */
124 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */
125 #define LPTOUTMAX 1 /* maximal timeout 1 s */
126 #define LPPRI (PZERO+8)
127 #define BUFSIZE 1024
128
129 #ifndef DEBUG
130 #define lprintf(args)
131 #else
132 #define lprintf(args) do { \
133 if (lptflag) \
134 printf args; \
135 } while (0)
136 static int volatile lptflag = 1;
137 #endif
138
139 #define LPTUNIT(s) ((s)&0x03)
140 #define LPTFLAGS(s) ((s)&0xfc)
141
142 struct lpt_softc {
143 struct resource *res_port;
144 struct resource *res_irq;
145 void *sc_ih;
146
147 int sc_port;
148 short sc_state;
149 /* default case: negative prime, negative ack, handshake strobe,
150 prime once */
151 u_char sc_control;
152 char sc_flags;
153 #define LP_POS_INIT 0x04 /* if we are a postive init signal */
154 #define LP_POS_ACK 0x08 /* if we are a positive going ack */
155 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */
156 #define LP_PRIMEOPEN 0x20 /* prime on every open */
157 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */
158 #define LP_BYPASS 0x80 /* bypass printer ready checks */
159 void *sc_inbuf;
160 short sc_xfercnt ;
161 char sc_primed;
162 char *sc_cp ;
163 u_char sc_irq ; /* IRQ status of port */
164 #define LP_HAS_IRQ 0x01 /* we have an irq available */
165 #define LP_USE_IRQ 0x02 /* we are using our irq */
166 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */
167 u_char sc_backoff ; /* time to call lptout() again */
168 };
169
170 /* bits for state */
171 #define OPEN (1<<0) /* device is open */
172 #define ASLP (1<<1) /* awaiting draining of printer */
173 #define ERROR (1<<2) /* error was received from printer */
174 #define OBUSY (1<<3) /* printer is busy doing output */
175 #define LPTOUT (1<<4) /* timeout while not selected */
176 #define TOUT (1<<5) /* timeout while not selected */
177 #define INIT (1<<6) /* waiting to initialize for open */
178 #define INTERRUPTED (1<<7) /* write call was interrupted */
179
180
181 /* status masks to interrogate printer status */
182 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */
183 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR)
184
185 /* Printer Ready condition - from lpa.c */
186 /* Only used in polling code */
187 #define NOT_READY(x) ((inb(x) & LPS_NBSY) != LPS_NBSY)
188
189 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */
190 #define MAX_SPIN 20 /* Max delay for device ready in usecs */
191
192 static timeout_t lptout;
193 static int lpt_probe(device_t);
194 static int lpt_attach(device_t);
195 static void lpt_intr(void *);
196
197 static devclass_t olpt_devclass;
198
199 static device_method_t olpt_methods[] = {
200 DEVMETHOD(device_probe, lpt_probe),
201 DEVMETHOD(device_attach, lpt_attach),
202 { 0, 0 }
203 };
204
205 static driver_t olpt_driver = {
206 "olpt",
207 olpt_methods,
208 sizeof (struct lpt_softc),
209 };
210
211 DRIVER_MODULE(olpt, isa, olpt_driver, olpt_devclass, 0, 0);
212
213 static d_open_t lptopen;
214 static d_close_t lptclose;
215 static d_write_t lptwrite;
216 static d_ioctl_t lptioctl;
217
218 static struct cdevsw lpt_cdevsw = {
219 .d_version = D_VERSION,
220 .d_flags = D_NEEDGIANT,
221 .d_open = lptopen,
222 .d_close = lptclose,
223 .d_write = lptwrite,
224 .d_ioctl = lptioctl,
225 .d_name = "lpt",
226 };
227
228 static bus_addr_t lpt_iat[] = {0, 2, 4, 6};
229
230 /*
231 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94
232 * Based partially on Rod Grimes' printer probe
233 *
234 * Logic:
235 * 1) If no port address was given, use the bios detected ports
236 * and autodetect what ports the printers are on.
237 * 2) Otherwise, probe the data port at the address given,
238 * using the method in Rod Grimes' port probe.
239 * (Much code ripped off directly from Rod's probe.)
240 *
241 * Comments from Rod's probe:
242 * Logic:
243 * 1) You should be able to write to and read back the same value
244 * to the data port. Do an alternating zeros, alternating ones,
245 * walking zero, and walking one test to check for stuck bits.
246 *
247 * 2) You should be able to write to and read back the same value
248 * to the control port lower 5 bits, the upper 3 bits are reserved
249 * per the IBM PC technical reference manauls and different boards
250 * do different things with them. Do an alternating zeros, alternating
251 * ones, walking zero, and walking one test to check for stuck bits.
252 *
253 * Some printers drag the strobe line down when the are powered off
254 * so this bit has been masked out of the control port test.
255 *
256 * XXX Some printers may not like a fast pulse on init or strobe, I
257 * don't know at this point, if that becomes a problem these bits
258 * should be turned off in the mask byte for the control port test.
259 *
260 * We are finally left with a mask of 0x14, due to some printers
261 * being adamant about holding other bits high ........
262 *
263 * Before probing the control port, we write a 0 to the data port -
264 * If not, some printers chuck out garbage when the strobe line
265 * gets toggled.
266 *
267 * 3) Set the data and control ports to a value of 0
268 *
269 * This probe routine has been tested on Epson Lx-800, HP LJ3P,
270 * Epson FX-1170 and C.Itoh 8510RM
271 * printers.
272 * Quick exit on fail added.
273 */
274
275 int
276 lpt_probe(device_t dev)
277 {
278 #define PC98_OLD_LPT 0x40
279 #define PC98_IEEE_1284_FUNCTION 0x149
280 int rid;
281 struct resource *res;
282
283 /* Check isapnp ids */
284 if (isa_get_vendorid(dev))
285 return ENXIO;
286
287 rid = 0;
288 res = isa_alloc_resourcev(dev, SYS_RES_IOPORT, &rid, lpt_iat, 4,
289 RF_ACTIVE);
290 if (res == NULL)
291 return ENXIO;
292 isa_load_resourcev(res, lpt_iat, 4);
293
294 if (isa_get_port(dev) == PC98_OLD_LPT) {
295 unsigned int pc98_ieee_mode, tmp;
296
297 tmp = inb(PC98_IEEE_1284_FUNCTION);
298 pc98_ieee_mode = tmp;
299 if ((tmp & 0x10) == 0x10) {
300 outb(PC98_IEEE_1284_FUNCTION, tmp & ~0x10);
301 tmp = inb(PC98_IEEE_1284_FUNCTION);
302 if ((tmp & 0x10) != 0x10) {
303 outb(PC98_IEEE_1284_FUNCTION, pc98_ieee_mode);
304 bus_release_resource(dev, SYS_RES_IOPORT, rid,
305 res);
306 return ENXIO;
307 }
308 }
309 }
310
311 bus_release_resource(dev, SYS_RES_IOPORT, rid, res);
312 return 0;
313 }
314
315 /* XXX Todo - try and detect if interrupt is working */
316 int
317 lpt_attach(device_t dev)
318 {
319 int rid, unit;
320 struct lpt_softc *sc;
321
322 unit = device_get_unit(dev);
323 sc = device_get_softc(dev);
324
325 rid = 0;
326 sc->res_port = isa_alloc_resourcev(dev, SYS_RES_IOPORT, &rid,
327 lpt_iat, 4, RF_ACTIVE);
328 if (sc->res_port == NULL)
329 return ENXIO;
330 isa_load_resourcev(sc->res_port, lpt_iat, 4);
331
332 sc->sc_port = rman_get_start(sc->res_port);
333 sc->sc_primed = 0; /* not primed yet */
334
335 outb(sc->sc_port+lpt_pstb_ctrl, LPC_DIS_PSTB); /* PSTB disable */
336 outb(sc->sc_port+lpt_control, LPC_MODE8255); /* 8255 mode set */
337 outb(sc->sc_port+lpt_control, LPC_NIRQ8); /* IRQ8 inactive */
338 outb(sc->sc_port+lpt_control, LPC_NPSTB); /* PSTB inactive */
339 outb(sc->sc_port+lpt_pstb_ctrl, LPC_EN_PSTB); /* PSTB enable */
340
341 sc->sc_irq = 0;
342 if (isa_get_irq(dev) != -1) {
343 rid = 0;
344 sc->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
345 RF_ACTIVE);
346 if (sc->res_irq == NULL) {
347 bus_release_resource(dev, SYS_RES_IOPORT, 0,
348 sc->res_port);
349 return ENXIO;
350 }
351 if (bus_setup_intr(dev, sc->res_irq, INTR_TYPE_TTY, NULL, lpt_intr,
352 sc, &sc->sc_ih)) {
353 bus_release_resource(dev, SYS_RES_IOPORT, 0,
354 sc->res_port);
355 bus_release_resource(dev, SYS_RES_IRQ, 0,
356 sc->res_irq);
357 return ENXIO;
358 }
359 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ;
360 device_printf(dev, "Interrupt-driven port");
361 }
362
363 /* XXX what to do about the flags in the minor number? */
364 make_dev(&lpt_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600, "lpt%d", unit);
365 make_dev(&lpt_cdevsw, unit | LP_BYPASS,
366 UID_ROOT, GID_WHEEL, 0600, "lpctl%d", unit);
367
368 return 0;
369 }
370
371 /*
372 * lptopen -- reset the printer, then wait until it's selected and not busy.
373 * If LP_BYPASS flag is selected, then we do not try to select the
374 * printer -- this is just used for passing ioctls.
375 */
376
377 static int
378 lptopen (struct cdev *dev, int flags, int fmt, struct thread *td)
379 {
380 struct lpt_softc *sc;
381 int s;
382 int port;
383
384 sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev)));
385 if (sc->sc_port == 0)
386 return (ENXIO);
387
388 if (sc->sc_state) {
389 lprintf(("lp: still open %x\n", sc->sc_state));
390 return(EBUSY);
391 } else
392 sc->sc_state |= INIT;
393
394 sc->sc_flags = LPTFLAGS(minor(dev));
395
396 /* Check for open with BYPASS flag set. */
397 if (sc->sc_flags & LP_BYPASS) {
398 sc->sc_state = OPEN;
399 return(0);
400 }
401
402 s = spltty();
403 lprintf(("lp flags 0x%x\n", sc->sc_flags));
404 port = sc->sc_port;
405
406 /* set IRQ status according to ENABLE_IRQ flag */
407 if (sc->sc_irq & LP_ENABLE_IRQ)
408 sc->sc_irq |= LP_USE_IRQ;
409 else
410 sc->sc_irq &= ~LP_USE_IRQ;
411
412 /* init printer */
413 sc->sc_state = OPEN;
414 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK);
415 sc->sc_xfercnt = 0;
416 splx(s);
417
418 /* only use timeout if using interrupt */
419 lprintf(("irq %x\n", sc->sc_irq));
420 if (sc->sc_irq & LP_USE_IRQ) {
421 sc->sc_state |= TOUT;
422 timeout (lptout, (caddr_t)sc,
423 (sc->sc_backoff = hz/LPTOUTINITIAL));
424 }
425
426 lprintf(("opened.\n"));
427 return(0);
428 }
429
430 static void
431 lptout (void *arg)
432 {
433 struct lpt_softc *sc = arg;
434 int pl;
435
436 lprintf(("T %x ", inb(sc->sc_port+lpt_status)));
437 if (sc->sc_state & OPEN) {
438 sc->sc_backoff++;
439 if (sc->sc_backoff > hz/LPTOUTMAX)
440 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX;
441 timeout (lptout, (caddr_t)sc, sc->sc_backoff);
442 } else
443 sc->sc_state &= ~TOUT;
444
445 if (sc->sc_state & ERROR)
446 sc->sc_state &= ~ERROR;
447
448 /*
449 * Avoid possible hangs do to missed interrupts
450 */
451 if (sc->sc_xfercnt) {
452 pl = spltty();
453 lpt_intr(sc);
454 splx(pl);
455 } else {
456 sc->sc_state &= ~OBUSY;
457 wakeup(sc);
458 }
459 }
460
461 /*
462 * lptclose -- close the device, free the local line buffer.
463 *
464 * Check for interrupted write call added.
465 */
466
467 static int
468 lptclose(struct cdev *dev, int flags, int fmt, struct thread *td)
469 {
470 struct lpt_softc *sc;
471
472 sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev)));
473 if(sc->sc_flags & LP_BYPASS)
474 goto end_close;
475
476 sc->sc_state &= ~OPEN;
477 free(sc->sc_inbuf, M_DEVBUF);
478
479 end_close:
480 sc->sc_state = 0;
481 sc->sc_xfercnt = 0;
482 lprintf(("closed.\n"));
483 return(0);
484 }
485
486 /*
487 * pushbytes()
488 * Workhorse for actually spinning and writing bytes to printer
489 * Derived from lpa.c
490 * Originally by ?
491 *
492 * This code is only used when we are polling the port
493 */
494 static int
495 pushbytes(struct lpt_softc * sc)
496 {
497 int spin, err, tic;
498 char ch;
499 int port = sc->sc_port;
500
501 lprintf(("p"));
502 /* loop for every character .. */
503 while (sc->sc_xfercnt > 0) {
504 /* printer data */
505 ch = *(sc->sc_cp);
506 sc->sc_cp++;
507 sc->sc_xfercnt--;
508
509 /*
510 * Wait for printer ready.
511 * Loop 20 usecs testing BUSY bit, then sleep
512 * for exponentially increasing timeout. (vak)
513 */
514 for (spin=0; NOT_READY(port+lpt_status) && spin<MAX_SPIN; ++spin)
515 DELAY(1); /* XXX delay is NOT this accurate! */
516 if (spin >= MAX_SPIN) {
517 tic = 0;
518 while (NOT_READY(port+lpt_status)) {
519 /*
520 * Now sleep, every cycle a
521 * little longer ..
522 */
523 tic = tic + tic + 1;
524 /*
525 * But no more than 10 seconds. (vak)
526 */
527 if (tic > MAX_SLEEP)
528 tic = MAX_SLEEP;
529 err = tsleep(sc, LPPRI,
530 "lptpoll", tic);
531 if (err != EWOULDBLOCK) {
532 return (err);
533 }
534 }
535 }
536
537 /* output data */
538 outb(port+lpt_data, ch);
539 DELAY(1);
540 outb(port+lpt_control, LPC_PSTB);
541 DELAY(1);
542 outb(port+lpt_control, LPC_NPSTB);
543 }
544 return(0);
545 }
546
547 /*
548 * lptwrite --copy a line from user space to a local buffer, then call
549 * putc to get the chars moved to the output queue.
550 *
551 * Flagging of interrupted write added.
552 */
553
554 static int
555 lptwrite(struct cdev *dev, struct uio * uio, int ioflag)
556 {
557 register unsigned n;
558 int pl, err;
559 struct lpt_softc *sc;
560
561 sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev)));
562 if(sc->sc_flags & LP_BYPASS) {
563 /* we can't do writes in bypass mode */
564 return(EPERM);
565 }
566
567 sc->sc_state &= ~INTERRUPTED;
568 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) {
569 sc->sc_cp = sc->sc_inbuf;
570 uiomove(sc->sc_cp, n, uio);
571 sc->sc_xfercnt = n ;
572 while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) {
573 lprintf(("i"));
574 /* if the printer is ready for a char, */
575 /* give it one */
576 if ((sc->sc_state & OBUSY) == 0){
577 lprintf(("\nC %d. ", sc->sc_xfercnt));
578 pl = spltty();
579 lpt_intr(sc);
580 (void) splx(pl);
581 }
582 lprintf(("W "));
583 if (sc->sc_state & OBUSY)
584 if ((err = tsleep (sc,
585 LPPRI|PCATCH, "lpwrite", 0))) {
586 sc->sc_state |= INTERRUPTED;
587 return(err);
588 }
589 }
590 /* check to see if we must do a polled write */
591 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) {
592 lprintf(("p"));
593 if((err = pushbytes(sc)))
594 return(err);
595 }
596 }
597 return(0);
598 }
599
600 /*
601 * lptintr -- handle printer interrupts which occur when the printer is
602 * ready to accept another char.
603 *
604 * do checking for interrupted write call.
605 */
606
607 static void
608 lpt_intr(void *arg)
609 {
610 }
611
612 static int
613 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td)
614 {
615 int error = 0;
616 struct lpt_softc *sc;
617 u_int unit = LPTUNIT(minor(dev));
618 u_char old_sc_irq; /* old printer IRQ status */
619
620 sc = devclass_get_softc(olpt_devclass, unit);
621
622 switch (cmd) {
623 case LPT_IRQ :
624 if(sc->sc_irq & LP_HAS_IRQ) {
625 /*
626 * NOTE:
627 * If the IRQ status is changed,
628 * this will only be visible on the
629 * next open.
630 *
631 * If interrupt status changes,
632 * this gets syslog'd.
633 */
634 old_sc_irq = sc->sc_irq;
635 if(*(int*)data == 0)
636 sc->sc_irq &= (~LP_ENABLE_IRQ);
637 else
638 sc->sc_irq |= LP_ENABLE_IRQ;
639 if (old_sc_irq != sc->sc_irq )
640 log(LOG_NOTICE, "lpt%c switched to %s mode\n",
641 (char)unit+'',
642 (sc->sc_irq & LP_ENABLE_IRQ)?
643 "interrupt-driven":"polled");
644 } else /* polled port */
645 error = EOPNOTSUPP;
646 break;
647 default:
648 error = ENODEV;
649 }
650
651 return(error);
652 }
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