olpt.c revision 126080
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: head/sys/pc98/cbus/olpt.c 126080 2004-02-21 21:10:55Z phk $ 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/uio.h> 110#include <sys/syslog.h> 111#include <sys/malloc.h> 112 113#include <machine/clock.h> 114#include <machine/bus.h> 115#include <machine/resource.h> 116#include <sys/rman.h> 117 118#include <isa/isavar.h> 119 120#include <i386/isa/lptreg.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 PC98 130/* BIOS printer list - used by BIOS probe*/ 131#define BIOS_LPT_PORTS 0x408 132#define BIOS_PORTS (short *)(KERNBASE+BIOS_LPT_PORTS) 133#define BIOS_MAX_LPT 4 134#endif 135 136 137#ifndef DEBUG 138#define lprintf(args) 139#else 140#define lprintf(args) do { \ 141 if (lptflag) \ 142 printf args; \ 143 } while (0) 144static int volatile lptflag = 1; 145#endif 146 147#define LPTUNIT(s) ((s)&0x03) 148#define LPTFLAGS(s) ((s)&0xfc) 149 150struct lpt_softc { 151 struct resource *res_port; 152 struct resource *res_irq; 153 void *sc_ih; 154 155 int sc_port; 156 short sc_state; 157 /* default case: negative prime, negative ack, handshake strobe, 158 prime once */ 159 u_char sc_control; 160 char sc_flags; 161#define LP_POS_INIT 0x04 /* if we are a postive init signal */ 162#define LP_POS_ACK 0x08 /* if we are a positive going ack */ 163#define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 164#define LP_PRIMEOPEN 0x20 /* prime on every open */ 165#define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 166#define LP_BYPASS 0x80 /* bypass printer ready checks */ 167 void *sc_inbuf; 168 short sc_xfercnt ; 169 char sc_primed; 170 char *sc_cp ; 171 u_char sc_irq ; /* IRQ status of port */ 172#define LP_HAS_IRQ 0x01 /* we have an irq available */ 173#define LP_USE_IRQ 0x02 /* we are using our irq */ 174#define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 175 u_char sc_backoff ; /* time to call lptout() again */ 176}; 177 178/* bits for state */ 179#define OPEN (1<<0) /* device is open */ 180#define ASLP (1<<1) /* awaiting draining of printer */ 181#define ERROR (1<<2) /* error was received from printer */ 182#define OBUSY (1<<3) /* printer is busy doing output */ 183#define LPTOUT (1<<4) /* timeout while not selected */ 184#define TOUT (1<<5) /* timeout while not selected */ 185#define INIT (1<<6) /* waiting to initialize for open */ 186#define INTERRUPTED (1<<7) /* write call was interrupted */ 187 188 189/* status masks to interrogate printer status */ 190#define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 191#define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 192 193/* Printer Ready condition - from lpa.c */ 194/* Only used in polling code */ 195#ifdef PC98 196#define NOT_READY(x) ((inb(x) & LPS_NBSY) != LPS_NBSY) 197#else /* IBM-PC */ 198#define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 199#define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 200#define NOT_READY(x) ((inb(x)^LPS_INVERT)&LPS_MASK) 201#endif 202 203#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 204#define MAX_SPIN 20 /* Max delay for device ready in usecs */ 205 206static timeout_t lptout; 207static int lpt_probe(device_t); 208static int lpt_attach(device_t); 209static void lpt_intr(void *); 210 211static devclass_t olpt_devclass; 212 213static device_method_t olpt_methods[] = { 214 DEVMETHOD(device_probe, lpt_probe), 215 DEVMETHOD(device_attach, lpt_attach), 216 { 0, 0 } 217}; 218 219static driver_t olpt_driver = { 220 "olpt", 221 olpt_methods, 222 sizeof (struct lpt_softc), 223}; 224 225DRIVER_MODULE(olpt, isa, olpt_driver, olpt_devclass, 0, 0); 226 227static d_open_t lptopen; 228static d_close_t lptclose; 229static d_write_t lptwrite; 230static d_ioctl_t lptioctl; 231 232static struct cdevsw lpt_cdevsw = { 233 .d_version = D_VERSION, 234 .d_flags = D_NEEDGIANT, 235 .d_open = lptopen, 236 .d_close = lptclose, 237 .d_write = lptwrite, 238 .d_ioctl = lptioctl, 239 .d_name = "lpt", 240}; 241 242static bus_addr_t lpt_iat[] = {0, 2, 4, 6}; 243 244#ifndef PC98 245/* 246 * Internal routine to lptprobe to do port tests of one byte value 247 */ 248static int 249lpt_port_test (int port, u_char data, u_char mask) 250{ 251 int temp, timeout; 252 253 data = data & mask; 254 outb(port, data); 255 timeout = 10000; 256 do { 257 DELAY(10); 258 temp = inb(port) & mask; 259 } 260 while (temp != data && --timeout); 261 lprintf(("Port 0x%x\tout=%x\tin=%x\ttout=%d\n", 262 port, data, temp, timeout)); 263 return (temp == data); 264} 265#endif /* PC98 */ 266 267/* 268 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 269 * Based partially on Rod Grimes' printer probe 270 * 271 * Logic: 272 * 1) If no port address was given, use the bios detected ports 273 * and autodetect what ports the printers are on. 274 * 2) Otherwise, probe the data port at the address given, 275 * using the method in Rod Grimes' port probe. 276 * (Much code ripped off directly from Rod's probe.) 277 * 278 * Comments from Rod's probe: 279 * Logic: 280 * 1) You should be able to write to and read back the same value 281 * to the data port. Do an alternating zeros, alternating ones, 282 * walking zero, and walking one test to check for stuck bits. 283 * 284 * 2) You should be able to write to and read back the same value 285 * to the control port lower 5 bits, the upper 3 bits are reserved 286 * per the IBM PC technical reference manauls and different boards 287 * do different things with them. Do an alternating zeros, alternating 288 * ones, walking zero, and walking one test to check for stuck bits. 289 * 290 * Some printers drag the strobe line down when the are powered off 291 * so this bit has been masked out of the control port test. 292 * 293 * XXX Some printers may not like a fast pulse on init or strobe, I 294 * don't know at this point, if that becomes a problem these bits 295 * should be turned off in the mask byte for the control port test. 296 * 297 * We are finally left with a mask of 0x14, due to some printers 298 * being adamant about holding other bits high ........ 299 * 300 * Before probing the control port, we write a 0 to the data port - 301 * If not, some printers chuck out garbage when the strobe line 302 * gets toggled. 303 * 304 * 3) Set the data and control ports to a value of 0 305 * 306 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 307 * Epson FX-1170 and C.Itoh 8510RM 308 * printers. 309 * Quick exit on fail added. 310 */ 311 312int 313lpt_probe(device_t dev) 314{ 315#ifdef PC98 316#define PC98_OLD_LPT 0x40 317#define PC98_IEEE_1284_FUNCTION 0x149 318 int rid; 319 struct resource *res; 320 321 /* Check isapnp ids */ 322 if (isa_get_vendorid(dev)) 323 return ENXIO; 324 325 rid = 0; 326 res = isa_alloc_resourcev(dev, SYS_RES_IOPORT, &rid, lpt_iat, 4, 327 RF_ACTIVE); 328 if (res == NULL) 329 return ENXIO; 330 isa_load_resourcev(res, lpt_iat, 4); 331 332 if (isa_get_port(dev) == PC98_OLD_LPT) { 333 unsigned int pc98_ieee_mode, tmp; 334 335 tmp = inb(PC98_IEEE_1284_FUNCTION); 336 pc98_ieee_mode = tmp; 337 if ((tmp & 0x10) == 0x10) { 338 outb(PC98_IEEE_1284_FUNCTION, tmp & ~0x10); 339 tmp = inb(PC98_IEEE_1284_FUNCTION); 340 if ((tmp & 0x10) != 0x10) { 341 outb(PC98_IEEE_1284_FUNCTION, pc98_ieee_mode); 342 bus_release_resource(dev, SYS_RES_IOPORT, rid, 343 res); 344 return ENXIO; 345 } 346 } 347 } 348 349 bus_release_resource(dev, SYS_RES_IOPORT, rid, res); 350 return 0; 351#else 352 int port; 353 static short next_bios_lpt = 0; 354 int status; 355 static u_char testbyte[18] = { 356 0x55, /* alternating zeros */ 357 0xaa, /* alternating ones */ 358 0xfe, 0xfd, 0xfb, 0xf7, 359 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 360 0x01, 0x02, 0x04, 0x08, 361 0x10, 0x20, 0x40, 0x80 /* walking one */ 362 }; 363 int i; 364 365 /* 366 * Make sure there is some way for lptopen to see that 367 * the port is not configured 368 * This 0 will remain if the port isn't attached 369 */ 370 (lpt_sc + dvp->id_unit)->sc_port = 0; 371 372 status = IO_LPTSIZE; 373 /* If port not specified, use bios list */ 374 if(dvp->id_iobase < 0) { /* port? */ 375 if((next_bios_lpt < BIOS_MAX_LPT) && 376 (*(BIOS_PORTS+next_bios_lpt) != 0) ) { 377 dvp->id_iobase = *(BIOS_PORTS+next_bios_lpt++); 378 goto end_probe; 379 } else 380 return (0); 381 } 382 383 /* Port was explicitly specified */ 384 /* This allows probing of ports unknown to the BIOS */ 385 port = dvp->id_iobase + lpt_data; 386 for (i = 0; i < 18; i++) { 387 if (!lpt_port_test(port, testbyte[i], 0xff)) { 388 status = 0; 389 goto end_probe; 390 } 391 } 392 393end_probe: 394 /* write 0's to control and data ports */ 395 outb(dvp->id_iobase+lpt_data, 0); 396 outb(dvp->id_iobase+lpt_control, 0); 397 398 return (status); 399#endif 400} 401 402/* XXX Todo - try and detect if interrupt is working */ 403int 404lpt_attach(device_t dev) 405{ 406 int rid, unit; 407 struct lpt_softc *sc; 408 409 unit = device_get_unit(dev); 410 sc = device_get_softc(dev); 411 412 rid = 0; 413 sc->res_port = isa_alloc_resourcev(dev, SYS_RES_IOPORT, &rid, 414 lpt_iat, 4, RF_ACTIVE); 415 if (sc->res_port == NULL) 416 return ENXIO; 417 isa_load_resourcev(sc->res_port, lpt_iat, 4); 418 419 sc->sc_port = rman_get_start(sc->res_port); 420 sc->sc_primed = 0; /* not primed yet */ 421#ifdef PC98 422 outb(sc->sc_port+lpt_pstb_ctrl, LPC_DIS_PSTB); /* PSTB disable */ 423 outb(sc->sc_port+lpt_control, LPC_MODE8255); /* 8255 mode set */ 424 outb(sc->sc_port+lpt_control, LPC_NIRQ8); /* IRQ8 inactive */ 425 outb(sc->sc_port+lpt_control, LPC_NPSTB); /* PSTB inactive */ 426 outb(sc->sc_port+lpt_pstb_ctrl, LPC_EN_PSTB); /* PSTB enable */ 427#else 428 outb(sc->sc_port+lpt_control, LPC_NINIT); 429#endif 430 431 sc->sc_irq = 0; 432 if (isa_get_irq(dev) != -1) { 433 rid = 0; 434 sc->res_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 435 0, ~0, 1, RF_ACTIVE); 436 if (sc->res_irq == NULL) { 437 bus_release_resource(dev, SYS_RES_IOPORT, 0, 438 sc->res_port); 439 return ENXIO; 440 } 441 if (bus_setup_intr(dev, sc->res_irq, INTR_TYPE_TTY, lpt_intr, 442 sc, &sc->sc_ih)) { 443 bus_release_resource(dev, SYS_RES_IOPORT, 0, 444 sc->res_port); 445 bus_release_resource(dev, SYS_RES_IRQ, 0, 446 sc->res_irq); 447 return ENXIO; 448 } 449 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 450 device_printf(dev, "Interrupt-driven port"); 451 } 452 453 /* XXX what to do about the flags in the minor number? */ 454 make_dev(&lpt_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600, "lpt%d", unit); 455 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 456 UID_ROOT, GID_WHEEL, 0600, "lpctl%d", unit); 457 458 return 0; 459} 460 461/* 462 * lptopen -- reset the printer, then wait until it's selected and not busy. 463 * If LP_BYPASS flag is selected, then we do not try to select the 464 * printer -- this is just used for passing ioctls. 465 */ 466 467static int 468lptopen (dev_t dev, int flags, int fmt, struct thread *td) 469{ 470 struct lpt_softc *sc; 471 int s; 472#ifdef PC98 473 int port; 474#else 475 int trys, port; 476#endif 477 478 sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev))); 479 if (sc->sc_port == 0) 480 return (ENXIO); 481 482 if (sc->sc_state) { 483 lprintf(("lp: still open %x\n", sc->sc_state)); 484 return(EBUSY); 485 } else 486 sc->sc_state |= INIT; 487 488 sc->sc_flags = LPTFLAGS(minor(dev)); 489 490 /* Check for open with BYPASS flag set. */ 491 if (sc->sc_flags & LP_BYPASS) { 492 sc->sc_state = OPEN; 493 return(0); 494 } 495 496 s = spltty(); 497 lprintf(("lp flags 0x%x\n", sc->sc_flags)); 498 port = sc->sc_port; 499 500 /* set IRQ status according to ENABLE_IRQ flag */ 501 if (sc->sc_irq & LP_ENABLE_IRQ) 502 sc->sc_irq |= LP_USE_IRQ; 503 else 504 sc->sc_irq &= ~LP_USE_IRQ; 505 506 /* init printer */ 507#ifndef PC98 508 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 509 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 510 outb(port+lpt_control, 0); 511 sc->sc_primed++; 512 DELAY(500); 513 } 514 } 515 516 outb (port+lpt_control, LPC_SEL|LPC_NINIT); 517 518 /* wait till ready (printer running diagnostics) */ 519 trys = 0; 520 do { 521 /* ran out of waiting for the printer */ 522 if (trys++ >= LPINITRDY*4) { 523 splx(s); 524 sc->sc_state = 0; 525 lprintf(("status %x\n", inb(port+lpt_status))); 526 return (EBUSY); 527 } 528 529 /* wait 1/4 second, give up if we get a signal */ 530 if (tsleep (sc, LPPRI|PCATCH, "lptinit", hz/4) != 531 EWOULDBLOCK) { 532 sc->sc_state = 0; 533 splx(s); 534 return (EBUSY); 535 } 536 537 /* is printer online and ready for output */ 538 } while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 539 (LPS_SEL|LPS_NBSY|LPS_NERR)); 540 541 sc->sc_control = LPC_SEL|LPC_NINIT; 542 if (sc->sc_flags & LP_AUTOLF) 543 sc->sc_control |= LPC_AUTOL; 544 545 /* enable interrupt if interrupt-driven */ 546 if (sc->sc_irq & LP_USE_IRQ) 547 sc->sc_control |= LPC_ENA; 548 549 outb(port+lpt_control, sc->sc_control); 550#endif 551 552 sc->sc_state = OPEN; 553 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 554 sc->sc_xfercnt = 0; 555 splx(s); 556 557 /* only use timeout if using interrupt */ 558 lprintf(("irq %x\n", sc->sc_irq)); 559 if (sc->sc_irq & LP_USE_IRQ) { 560 sc->sc_state |= TOUT; 561 timeout (lptout, (caddr_t)sc, 562 (sc->sc_backoff = hz/LPTOUTINITIAL)); 563 } 564 565 lprintf(("opened.\n")); 566 return(0); 567} 568 569static void 570lptout (void *arg) 571{ 572 struct lpt_softc *sc = arg; 573 int pl; 574 575 lprintf(("T %x ", inb(sc->sc_port+lpt_status))); 576 if (sc->sc_state & OPEN) { 577 sc->sc_backoff++; 578 if (sc->sc_backoff > hz/LPTOUTMAX) 579 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 580 timeout (lptout, (caddr_t)sc, sc->sc_backoff); 581 } else 582 sc->sc_state &= ~TOUT; 583 584 if (sc->sc_state & ERROR) 585 sc->sc_state &= ~ERROR; 586 587 /* 588 * Avoid possible hangs do to missed interrupts 589 */ 590 if (sc->sc_xfercnt) { 591 pl = spltty(); 592 lpt_intr(sc); 593 splx(pl); 594 } else { 595 sc->sc_state &= ~OBUSY; 596 wakeup(sc); 597 } 598} 599 600/* 601 * lptclose -- close the device, free the local line buffer. 602 * 603 * Check for interrupted write call added. 604 */ 605 606static int 607lptclose(dev_t dev, int flags, int fmt, struct thread *td) 608{ 609 struct lpt_softc *sc; 610#ifndef PC98 611 int port; 612#endif 613 614 sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev))); 615 if(sc->sc_flags & LP_BYPASS) 616 goto end_close; 617 618#ifndef PC98 619 port = sc->sc_port; 620#endif 621 sc->sc_state &= ~OPEN; 622 623#ifndef PC98 624 /* if the last write was interrupted, don't complete it */ 625 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 626 while ((inb(port+lpt_status) & (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 627 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 628 /* wait 1/4 second, give up if we get a signal */ 629 if (tsleep (sc, LPPRI|PCATCH, 630 "lpclose", hz) != EWOULDBLOCK) 631 break; 632 633 outb(sc->sc_port+lpt_control, LPC_NINIT); 634#endif 635 free(sc->sc_inbuf, M_DEVBUF); 636 637end_close: 638 sc->sc_state = 0; 639 sc->sc_xfercnt = 0; 640 lprintf(("closed.\n")); 641 return(0); 642} 643 644/* 645 * pushbytes() 646 * Workhorse for actually spinning and writing bytes to printer 647 * Derived from lpa.c 648 * Originally by ? 649 * 650 * This code is only used when we are polling the port 651 */ 652static int 653pushbytes(struct lpt_softc * sc) 654{ 655 int spin, err, tic; 656 char ch; 657 int port = sc->sc_port; 658 659 lprintf(("p")); 660 /* loop for every character .. */ 661 while (sc->sc_xfercnt > 0) { 662 /* printer data */ 663 ch = *(sc->sc_cp); 664 sc->sc_cp++; 665 sc->sc_xfercnt--; 666 667 /* 668 * Wait for printer ready. 669 * Loop 20 usecs testing BUSY bit, then sleep 670 * for exponentially increasing timeout. (vak) 671 */ 672 for (spin=0; NOT_READY(port+lpt_status) && spin<MAX_SPIN; ++spin) 673 DELAY(1); /* XXX delay is NOT this accurate! */ 674 if (spin >= MAX_SPIN) { 675 tic = 0; 676 while (NOT_READY(port+lpt_status)) { 677 /* 678 * Now sleep, every cycle a 679 * little longer .. 680 */ 681 tic = tic + tic + 1; 682 /* 683 * But no more than 10 seconds. (vak) 684 */ 685 if (tic > MAX_SLEEP) 686 tic = MAX_SLEEP; 687 err = tsleep(sc, LPPRI, 688 "lptpoll", tic); 689 if (err != EWOULDBLOCK) { 690 return (err); 691 } 692 } 693 } 694 695 /* output data */ 696 outb(port+lpt_data, ch); 697#ifdef PC98 698 DELAY(1); 699 outb(port+lpt_control, LPC_PSTB); 700 DELAY(1); 701 outb(port+lpt_control, LPC_NPSTB); 702#else 703 /* strobe */ 704 outb(port+lpt_control, sc->sc_control|LPC_STB); 705 outb(port+lpt_control, sc->sc_control); 706#endif 707 708 } 709 return(0); 710} 711 712/* 713 * lptwrite --copy a line from user space to a local buffer, then call 714 * putc to get the chars moved to the output queue. 715 * 716 * Flagging of interrupted write added. 717 */ 718 719static int 720lptwrite(dev_t dev, struct uio * uio, int ioflag) 721{ 722 register unsigned n; 723 int pl, err; 724 struct lpt_softc *sc; 725 726 sc = devclass_get_softc(olpt_devclass, LPTUNIT(minor(dev))); 727 if(sc->sc_flags & LP_BYPASS) { 728 /* we can't do writes in bypass mode */ 729 return(EPERM); 730 } 731 732 sc->sc_state &= ~INTERRUPTED; 733 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 734 sc->sc_cp = sc->sc_inbuf; 735 uiomove(sc->sc_cp, n, uio); 736 sc->sc_xfercnt = n ; 737 while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 738 lprintf(("i")); 739 /* if the printer is ready for a char, */ 740 /* give it one */ 741 if ((sc->sc_state & OBUSY) == 0){ 742 lprintf(("\nC %d. ", sc->sc_xfercnt)); 743 pl = spltty(); 744 lpt_intr(sc); 745 (void) splx(pl); 746 } 747 lprintf(("W ")); 748 if (sc->sc_state & OBUSY) 749 if ((err = tsleep (sc, 750 LPPRI|PCATCH, "lpwrite", 0))) { 751 sc->sc_state |= INTERRUPTED; 752 return(err); 753 } 754 } 755 /* check to see if we must do a polled write */ 756 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 757 lprintf(("p")); 758 if((err = pushbytes(sc))) 759 return(err); 760 } 761 } 762 return(0); 763} 764 765/* 766 * lptintr -- handle printer interrupts which occur when the printer is 767 * ready to accept another char. 768 * 769 * do checking for interrupted write call. 770 */ 771 772static void 773lpt_intr(void *arg) 774{ 775} 776 777static int 778lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td) 779{ 780 int error = 0; 781 struct lpt_softc *sc; 782 u_int unit = LPTUNIT(minor(dev)); 783 u_char old_sc_irq; /* old printer IRQ status */ 784 785 sc = devclass_get_softc(olpt_devclass, unit); 786 787 switch (cmd) { 788 case LPT_IRQ : 789 if(sc->sc_irq & LP_HAS_IRQ) { 790 /* 791 * NOTE: 792 * If the IRQ status is changed, 793 * this will only be visible on the 794 * next open. 795 * 796 * If interrupt status changes, 797 * this gets syslog'd. 798 */ 799 old_sc_irq = sc->sc_irq; 800 if(*(int*)data == 0) 801 sc->sc_irq &= (~LP_ENABLE_IRQ); 802 else 803 sc->sc_irq |= LP_ENABLE_IRQ; 804 if (old_sc_irq != sc->sc_irq ) 805 log(LOG_NOTICE, "lpt%c switched to %s mode\n", 806 (char)unit+'0', 807 (sc->sc_irq & LP_ENABLE_IRQ)? 808 "interrupt-driven":"polled"); 809 } else /* polled port */ 810 error = EOPNOTSUPP; 811 break; 812 default: 813 error = ENODEV; 814 } 815 816 return(error); 817} 818