Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/pc98/cbus/olpt.c
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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 struct lpt_softc { 140 struct resource *res_port; 141 struct resource *res_irq; 142 void *sc_ih; 143 struct callout timer; 144 145 int sc_port; 146 short sc_state; 147 /* default case: negative prime, negative ack, handshake strobe, 148 prime once */ 149 u_char sc_control; 150 char sc_flags; 151 #define LP_POS_INIT 0x04 /* if we are a postive init signal */ 152 #define LP_POS_ACK 0x08 /* if we are a positive going ack */ 153 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 154 #define LP_PRIMEOPEN 0x20 /* prime on every open */ 155 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 156 #define LP_BYPASS 0x80 /* bypass printer ready checks */ 157 void *sc_inbuf; 158 short sc_xfercnt ; 159 char sc_primed; 160 char *sc_cp ; 161 u_char sc_irq ; /* IRQ status of port */ 162 #define LP_HAS_IRQ 0x01 /* we have an irq available */ 163 #define LP_USE_IRQ 0x02 /* we are using our irq */ 164 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 165 u_char sc_backoff ; /* time to call lptout() again */ 166 }; 167 168 /* bits for state */ 169 #define OPEN (1<<0) /* device is open */ 170 #define ASLP (1<<1) /* awaiting draining of printer */ 171 #define ERROR (1<<2) /* error was received from printer */ 172 #define OBUSY (1<<3) /* printer is busy doing output */ 173 #define LPTOUT (1<<4) /* timeout while not selected */ 174 #define TOUT (1<<5) /* timeout while not selected */ 175 #define INIT (1<<6) /* waiting to initialize for open */ 176 #define INTERRUPTED (1<<7) /* write call was interrupted */ 177 178 179 /* status masks to interrogate printer status */ 180 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 181 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 182 183 /* Printer Ready condition - from lpa.c */ 184 /* Only used in polling code */ 185 #define NOT_READY(x) ((inb(x) & LPS_NBSY) != LPS_NBSY) 186 187 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 188 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 189 190 static timeout_t lptout; 191 static int lpt_probe(device_t); 192 static int lpt_attach(device_t); 193 static void lpt_intr(void *); 194 195 static devclass_t olpt_devclass; 196 197 static device_method_t olpt_methods[] = { 198 DEVMETHOD(device_probe, lpt_probe), 199 DEVMETHOD(device_attach, lpt_attach), 200 { 0, 0 } 201 }; 202 203 static driver_t olpt_driver = { 204 "olpt", 205 olpt_methods, 206 sizeof (struct lpt_softc), 207 }; 208 209 DRIVER_MODULE(olpt, isa, olpt_driver, olpt_devclass, 0, 0); 210 211 static d_open_t lptopen; 212 static d_close_t lptclose; 213 static d_write_t lptwrite; 214 static d_ioctl_t lptioctl; 215 216 static struct cdevsw lpt_cdevsw = { 217 .d_version = D_VERSION, 218 .d_flags = D_NEEDGIANT, 219 .d_open = lptopen, 220 .d_close = lptclose, 221 .d_write = lptwrite, 222 .d_ioctl = lptioctl, 223 .d_name = "lpt", 224 }; 225 226 static bus_addr_t lpt_iat[] = {0, 2, 4, 6}; 227 228 /* 229 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 230 * Based partially on Rod Grimes' printer probe 231 * 232 * Logic: 233 * 1) If no port address was given, use the bios detected ports 234 * and autodetect what ports the printers are on. 235 * 2) Otherwise, probe the data port at the address given, 236 * using the method in Rod Grimes' port probe. 237 * (Much code ripped off directly from Rod's probe.) 238 * 239 * Comments from Rod's probe: 240 * Logic: 241 * 1) You should be able to write to and read back the same value 242 * to the data port. Do an alternating zeros, alternating ones, 243 * walking zero, and walking one test to check for stuck bits. 244 * 245 * 2) You should be able to write to and read back the same value 246 * to the control port lower 5 bits, the upper 3 bits are reserved 247 * per the IBM PC technical reference manauls and different boards 248 * do different things with them. Do an alternating zeros, alternating 249 * ones, walking zero, and walking one test to check for stuck bits. 250 * 251 * Some printers drag the strobe line down when the are powered off 252 * so this bit has been masked out of the control port test. 253 * 254 * XXX Some printers may not like a fast pulse on init or strobe, I 255 * don't know at this point, if that becomes a problem these bits 256 * should be turned off in the mask byte for the control port test. 257 * 258 * We are finally left with a mask of 0x14, due to some printers 259 * being adamant about holding other bits high ........ 260 * 261 * Before probing the control port, we write a 0 to the data port - 262 * If not, some printers chuck out garbage when the strobe line 263 * gets toggled. 264 * 265 * 3) Set the data and control ports to a value of 0 266 * 267 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 268 * Epson FX-1170 and C.Itoh 8510RM 269 * printers. 270 * Quick exit on fail added. 271 */ 272 273 int 274 lpt_probe(device_t dev) 275 { 276 #define PC98_OLD_LPT 0x40 277 #define PC98_IEEE_1284_FUNCTION 0x149 278 int rid; 279 struct resource *res; 280 281 /* Check isapnp ids */ 282 if (isa_get_vendorid(dev)) 283 return ENXIO; 284 285 rid = 0; 286 res = isa_alloc_resourcev(dev, SYS_RES_IOPORT, &rid, lpt_iat, 4, 287 RF_ACTIVE); 288 if (res == NULL) 289 return ENXIO; 290 isa_load_resourcev(res, lpt_iat, 4); 291 292 if (isa_get_port(dev) == PC98_OLD_LPT) { 293 unsigned int pc98_ieee_mode, tmp; 294 295 tmp = inb(PC98_IEEE_1284_FUNCTION); 296 pc98_ieee_mode = tmp; 297 if ((tmp & 0x10) == 0x10) { 298 outb(PC98_IEEE_1284_FUNCTION, tmp & ~0x10); 299 tmp = inb(PC98_IEEE_1284_FUNCTION); 300 if ((tmp & 0x10) != 0x10) { 301 outb(PC98_IEEE_1284_FUNCTION, pc98_ieee_mode); 302 bus_release_resource(dev, SYS_RES_IOPORT, rid, 303 res); 304 return ENXIO; 305 } 306 } 307 } 308 309 bus_release_resource(dev, SYS_RES_IOPORT, rid, res); 310 return 0; 311 } 312 313 /* XXX Todo - try and detect if interrupt is working */ 314 int 315 lpt_attach(device_t dev) 316 { 317 int rid, unit; 318 struct lpt_softc *sc; 319 struct cdev *cdev; 320 321 unit = device_get_unit(dev); 322 sc = device_get_softc(dev); 323 callout_init(&sc->timer, 0); 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 cdev = make_dev(&lpt_cdevsw, 0, 364 UID_ROOT, GID_WHEEL, 0600, "lpt%d", unit); 365 cdev->si_drv1 = sc; 366 cdev = make_dev(&lpt_cdevsw, LP_BYPASS, 367 UID_ROOT, GID_WHEEL, 0600, "lpctl%d", unit); 368 cdev->si_drv1 = sc; 369 370 return 0; 371 } 372 373 /* 374 * lptopen -- reset the printer, then wait until it's selected and not busy. 375 * If LP_BYPASS flag is selected, then we do not try to select the 376 * printer -- this is just used for passing ioctls. 377 */ 378 379 static int 380 lptopen (struct cdev *dev, int flags, int fmt, struct thread *td) 381 { 382 struct lpt_softc *sc = dev->si_drv1; 383 int s; 384 int port; 385 386 if (sc->sc_port == 0) 387 return (ENXIO); 388 389 if (sc->sc_state) { 390 lprintf(("lp: still open %x\n", sc->sc_state)); 391 return(EBUSY); 392 } else 393 sc->sc_state |= INIT; 394 395 sc->sc_flags = dev2unit(dev); 396 397 /* Check for open with BYPASS flag set. */ 398 if (sc->sc_flags & LP_BYPASS) { 399 sc->sc_state = OPEN; 400 return(0); 401 } 402 403 s = spltty(); 404 lprintf(("lp flags 0x%x\n", sc->sc_flags)); 405 port = sc->sc_port; 406 407 /* set IRQ status according to ENABLE_IRQ flag */ 408 if (sc->sc_irq & LP_ENABLE_IRQ) 409 sc->sc_irq |= LP_USE_IRQ; 410 else 411 sc->sc_irq &= ~LP_USE_IRQ; 412 413 /* init printer */ 414 sc->sc_state = OPEN; 415 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 416 sc->sc_xfercnt = 0; 417 splx(s); 418 419 /* only use timeout if using interrupt */ 420 lprintf(("irq %x\n", sc->sc_irq)); 421 if (sc->sc_irq & LP_USE_IRQ) { 422 sc->sc_state |= TOUT; 423 sc->sc_backoff = hz / LPTOUTINITIAL; 424 callout_reset(&sc->timer, sc->sc_backoff, lptout, sc); 425 } 426 427 lprintf(("opened.\n")); 428 return(0); 429 } 430 431 static void 432 lptout (void *arg) 433 { 434 struct lpt_softc *sc = arg; 435 int pl; 436 437 lprintf(("T %x ", inb(sc->sc_port+lpt_status))); 438 if (sc->sc_state & OPEN) { 439 sc->sc_backoff++; 440 if (sc->sc_backoff > hz/LPTOUTMAX) 441 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 442 callout_reset(&sc->timer, sc->sc_backoff, lptout, sc); 443 } else 444 sc->sc_state &= ~TOUT; 445 446 if (sc->sc_state & ERROR) 447 sc->sc_state &= ~ERROR; 448 449 /* 450 * Avoid possible hangs do to missed interrupts 451 */ 452 if (sc->sc_xfercnt) { 453 pl = spltty(); 454 lpt_intr(sc); 455 splx(pl); 456 } else { 457 sc->sc_state &= ~OBUSY; 458 wakeup(sc); 459 } 460 } 461 462 /* 463 * lptclose -- close the device, free the local line buffer. 464 * 465 * Check for interrupted write call added. 466 */ 467 468 static int 469 lptclose(struct cdev *dev, int flags, int fmt, struct thread *td) 470 { 471 struct lpt_softc *sc = dev->si_drv1; 472 473 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 = dev->si_drv1; 560 561 if(sc->sc_flags & LP_BYPASS) { 562 /* we can't do writes in bypass mode */ 563 return(EPERM); 564 } 565 566 sc->sc_state &= ~INTERRUPTED; 567 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 568 sc->sc_cp = sc->sc_inbuf; 569 uiomove(sc->sc_cp, n, uio); 570 sc->sc_xfercnt = n ; 571 while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 572 lprintf(("i")); 573 /* if the printer is ready for a char, */ 574 /* give it one */ 575 if ((sc->sc_state & OBUSY) == 0){ 576 lprintf(("\nC %d. ", sc->sc_xfercnt)); 577 pl = spltty(); 578 lpt_intr(sc); 579 (void) splx(pl); 580 } 581 lprintf(("W ")); 582 if (sc->sc_state & OBUSY) 583 if ((err = tsleep (sc, 584 LPPRI|PCATCH, "lpwrite", 0))) { 585 sc->sc_state |= INTERRUPTED; 586 return(err); 587 } 588 } 589 /* check to see if we must do a polled write */ 590 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 591 lprintf(("p")); 592 if((err = pushbytes(sc))) 593 return(err); 594 } 595 } 596 return(0); 597 } 598 599 /* 600 * lptintr -- handle printer interrupts which occur when the printer is 601 * ready to accept another char. 602 * 603 * do checking for interrupted write call. 604 */ 605 606 static void 607 lpt_intr(void *arg) 608 { 609 } 610 611 static int 612 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 613 { 614 int error = 0; 615 struct lpt_softc *sc = dev->si_drv1; 616 u_char old_sc_irq; /* old printer IRQ status */ 617 618 switch (cmd) { 619 case LPT_IRQ : 620 if(sc->sc_irq & LP_HAS_IRQ) { 621 /* 622 * NOTE: 623 * If the IRQ status is changed, 624 * this will only be visible on the 625 * next open. 626 * 627 * If interrupt status changes, 628 * this gets syslog'd. 629 */ 630 old_sc_irq = sc->sc_irq; 631 if(*(int*)data == 0) 632 sc->sc_irq &= (~LP_ENABLE_IRQ); 633 else 634 sc->sc_irq |= LP_ENABLE_IRQ; 635 if (old_sc_irq != sc->sc_irq ) 636 log(LOG_NOTICE, "%s switched to %s mode\n", 637 devtoname(dev), 638 (sc->sc_irq & LP_ENABLE_IRQ)? 639 "interrupt-driven":"polled"); 640 } else /* polled port */ 641 error = EOPNOTSUPP; 642 break; 643 default: 644 error = ENODEV; 645 } 646 647 return(error); 648 }
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