lpt.c revision 74810
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 * 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 51 * $FreeBSD: head/sys/dev/ppbus/lpt.c 74810 2001-03-26 12:41:29Z phk $ 52 */ 53 54/* 55 * Device Driver for AT parallel printer port 56 * Written by William Jolitz 12/18/90 57 */ 58 59/* 60 * Updated for ppbus by Nicolas Souchu 61 * [Mon Jul 28 1997] 62 */ 63 64#include "opt_lpt.h" 65 66#include <sys/param.h> 67#include <sys/systm.h> 68#include <sys/module.h> 69#include <sys/bus.h> 70#include <sys/conf.h> 71#include <sys/kernel.h> 72#include <sys/uio.h> 73#include <sys/syslog.h> 74#include <sys/malloc.h> 75 76#include <machine/bus.h> 77#include <machine/resource.h> 78#include <sys/rman.h> 79 80#include <dev/ppbus/lptio.h> 81#include <dev/ppbus/ppbconf.h> 82#include <dev/ppbus/ppb_1284.h> 83#include <dev/ppbus/lpt.h> 84#include "ppbus_if.h" 85#include <dev/ppbus/ppbio.h> 86 87#ifndef LPT_DEBUG 88#define lprintf(args) 89#else 90#define lprintf(args) \ 91 do { \ 92 if (lptflag) \ 93 printf args; \ 94 } while (0) 95static int volatile lptflag = 1; 96#endif 97 98#define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 99#define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 100#define LPTOUTMAX 1 /* maximal timeout 1 s */ 101#define LPPRI (PZERO+8) 102#define BUFSIZE 1024 103#define BUFSTATSIZE 32 104 105#define LPTUNIT(s) ((s)&0x03) 106#define LPTFLAGS(s) ((s)&0xfc) 107 108struct lpt_data { 109 110 short sc_state; 111 /* default case: negative prime, negative ack, handshake strobe, 112 prime once */ 113 u_char sc_control; 114 char sc_flags; 115#define LP_POS_INIT 0x04 /* if we are a postive init signal */ 116#define LP_POS_ACK 0x08 /* if we are a positive going ack */ 117#define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 118#define LP_PRIMEOPEN 0x20 /* prime on every open */ 119#define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 120#define LP_BYPASS 0x80 /* bypass printer ready checks */ 121 void *sc_inbuf; 122 void *sc_statbuf; 123 short sc_xfercnt ; 124 char sc_primed; 125 char *sc_cp ; 126 u_short sc_irq ; /* IRQ status of port */ 127#define LP_HAS_IRQ 0x01 /* we have an irq available */ 128#define LP_USE_IRQ 0x02 /* we are using our irq */ 129#define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 130#define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 131 u_char sc_backoff ; /* time to call lptout() again */ 132 133 struct resource *intr_resource; /* interrupt resource */ 134 void *intr_cookie; /* interrupt registration cookie */ 135 136}; 137 138#define LPT_NAME "lpt" /* our official name */ 139 140static timeout_t lptout; 141static int lpt_port_test(device_t dev, u_char data, u_char mask); 142static int lpt_detect(device_t dev); 143 144#define DEVTOSOFTC(dev) \ 145 ((struct lpt_data *)device_get_softc(dev)) 146#define UNITOSOFTC(unit) \ 147 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit))) 148#define UNITODEVICE(unit) \ 149 (devclass_get_device(lpt_devclass, (unit))) 150 151static void lptintr(device_t dev); 152static void lpt_intr(void *arg); /* without spls */ 153 154static devclass_t lpt_devclass; 155 156 157/* bits for state */ 158#define OPEN (1<<0) /* device is open */ 159#define ASLP (1<<1) /* awaiting draining of printer */ 160#define EERROR (1<<2) /* error was received from printer */ 161#define OBUSY (1<<3) /* printer is busy doing output */ 162#define LPTOUT (1<<4) /* timeout while not selected */ 163#define TOUT (1<<5) /* timeout while not selected */ 164#define LPTINIT (1<<6) /* waiting to initialize for open */ 165#define INTERRUPTED (1<<7) /* write call was interrupted */ 166 167#define HAVEBUS (1<<8) /* the driver owns the bus */ 168 169 170/* status masks to interrogate printer status */ 171#define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 172#define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 173 174/* Printer Ready condition - from lpa.c */ 175/* Only used in polling code */ 176#define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 177#define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 178#define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 179 180#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 181#define MAX_SPIN 20 /* Max delay for device ready in usecs */ 182 183 184static d_open_t lptopen; 185static d_close_t lptclose; 186static d_write_t lptwrite; 187static d_read_t lptread; 188static d_ioctl_t lptioctl; 189 190#define CDEV_MAJOR 16 191static struct cdevsw lpt_cdevsw = { 192 /* open */ lptopen, 193 /* close */ lptclose, 194 /* read */ lptread, 195 /* write */ lptwrite, 196 /* ioctl */ lptioctl, 197 /* poll */ nopoll, 198 /* mmap */ nommap, 199 /* strategy */ nostrategy, 200 /* name */ LPT_NAME, 201 /* maj */ CDEV_MAJOR, 202 /* dump */ nodump, 203 /* psize */ nopsize, 204 /* flags */ 0, 205}; 206 207static int 208lpt_request_ppbus(device_t dev, int how) 209{ 210 device_t ppbus = device_get_parent(dev); 211 struct lpt_data *sc = DEVTOSOFTC(dev); 212 int error; 213 214 if (sc->sc_state & HAVEBUS) 215 return (0); 216 217 /* we have the bus only if the request succeded */ 218 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 219 sc->sc_state |= HAVEBUS; 220 221 return (error); 222} 223 224static int 225lpt_release_ppbus(device_t dev) 226{ 227 device_t ppbus = device_get_parent(dev); 228 struct lpt_data *sc = DEVTOSOFTC(dev); 229 int error = 0; 230 231 if ((error = ppb_release_bus(ppbus, dev)) == 0) 232 sc->sc_state &= ~HAVEBUS; 233 234 return (error); 235} 236 237/* 238 * Internal routine to lptprobe to do port tests of one byte value 239 */ 240static int 241lpt_port_test(device_t ppbus, u_char data, u_char mask) 242{ 243 int temp, timeout; 244 245 data = data & mask; 246 ppb_wdtr(ppbus, data); 247 timeout = 10000; 248 do { 249 DELAY(10); 250 temp = ppb_rdtr(ppbus) & mask; 251 } 252 while (temp != data && --timeout); 253 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 254 return (temp == data); 255} 256 257/* 258 * Probe simplified by replacing multiple loops with a hardcoded 259 * test pattern - 1999/02/08 des@freebsd.org 260 * 261 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 262 * Based partially on Rod Grimes' printer probe 263 * 264 * Logic: 265 * 1) If no port address was given, use the bios detected ports 266 * and autodetect what ports the printers are on. 267 * 2) Otherwise, probe the data port at the address given, 268 * using the method in Rod Grimes' port probe. 269 * (Much code ripped off directly from Rod's probe.) 270 * 271 * Comments from Rod's probe: 272 * Logic: 273 * 1) You should be able to write to and read back the same value 274 * to the data port. Do an alternating zeros, alternating ones, 275 * walking zero, and walking one test to check for stuck bits. 276 * 277 * 2) You should be able to write to and read back the same value 278 * to the control port lower 5 bits, the upper 3 bits are reserved 279 * per the IBM PC technical reference manauls and different boards 280 * do different things with them. Do an alternating zeros, alternating 281 * ones, walking zero, and walking one test to check for stuck bits. 282 * 283 * Some printers drag the strobe line down when the are powered off 284 * so this bit has been masked out of the control port test. 285 * 286 * XXX Some printers may not like a fast pulse on init or strobe, I 287 * don't know at this point, if that becomes a problem these bits 288 * should be turned off in the mask byte for the control port test. 289 * 290 * We are finally left with a mask of 0x14, due to some printers 291 * being adamant about holding other bits high ........ 292 * 293 * Before probing the control port, we write a 0 to the data port - 294 * If not, some printers chuck out garbage when the strobe line 295 * gets toggled. 296 * 297 * 3) Set the data and control ports to a value of 0 298 * 299 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 300 * Epson FX-1170 and C.Itoh 8510RM 301 * printers. 302 * Quick exit on fail added. 303 */ 304static int 305lpt_detect(device_t dev) 306{ 307 device_t ppbus = device_get_parent(dev); 308 309 static u_char testbyte[18] = { 310 0x55, /* alternating zeros */ 311 0xaa, /* alternating ones */ 312 0xfe, 0xfd, 0xfb, 0xf7, 313 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 314 0x01, 0x02, 0x04, 0x08, 315 0x10, 0x20, 0x40, 0x80 /* walking one */ 316 }; 317 int i, error, status; 318 319 status = 1; /* assume success */ 320 321 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 322 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 323 status = 0; 324 goto end_probe; 325 } 326 327 for (i = 0; i < 18 && status; i++) 328 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 329 status = 0; 330 goto end_probe; 331 } 332 333end_probe: 334 /* write 0's to control and data ports */ 335 ppb_wdtr(ppbus, 0); 336 ppb_wctr(ppbus, 0); 337 338 lpt_release_ppbus(dev); 339 340 return (status); 341} 342 343static void 344lpt_identify(driver_t *driver, device_t parent) 345{ 346 347 BUS_ADD_CHILD(parent, 0, LPT_NAME, 0); 348} 349 350/* 351 * lpt_probe() 352 */ 353static int 354lpt_probe(device_t dev) 355{ 356 struct lpt_data *sc; 357 358 sc = DEVTOSOFTC(dev); 359 bzero(sc, sizeof(struct lpt_data)); 360 361 /* 362 * Now, try to detect the printer. 363 */ 364 if (!lpt_detect(dev)) 365 return (ENXIO); 366 367 device_set_desc(dev, "Printer"); 368 369 return (0); 370} 371 372static int 373lpt_attach(device_t dev) 374{ 375 device_t ppbus = device_get_parent(dev); 376 struct lpt_data *sc = DEVTOSOFTC(dev); 377 int zero = 0, unit = device_get_unit(dev); 378 int error; 379 uintptr_t irq; 380 381 sc->sc_primed = 0; /* not primed yet */ 382 383 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 384 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 385 return (0); 386 } 387 388 ppb_wctr(ppbus, LPC_NINIT); 389 390 /* check if we can use interrupt, should be done by ppc stuff */ 391 lprintf(("oldirq %x\n", sc->sc_irq)); 392 393 /* retrieve the ppbus irq */ 394 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 395 396 if (irq > 0) { 397 /* declare our interrupt handler */ 398 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 399 &zero, irq, irq, 1, RF_SHAREABLE); 400 } 401 if (sc->intr_resource) { 402 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 403 device_printf(dev, "Interrupt-driven port\n"); 404 } else { 405 sc->sc_irq = 0; 406 device_printf(dev, "Polled port\n"); 407 } 408 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 409 410 lpt_release_ppbus(dev); 411 412 make_dev(&lpt_cdevsw, unit, 413 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 414 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 415 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 416 return (0); 417} 418 419static void 420lptout(void *arg) 421{ 422 device_t dev = (device_t)arg; 423 struct lpt_data *sc = DEVTOSOFTC(dev); 424#ifdef LPT_DEBUG 425 device_t ppbus = device_get_parent(dev); 426#endif 427 428 lprintf(("T %x ", ppb_rstr(ppbus))); 429 if (sc->sc_state & OPEN) { 430 sc->sc_backoff++; 431 if (sc->sc_backoff > hz/LPTOUTMAX) 432 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 433 timeout(lptout, (caddr_t)dev, sc->sc_backoff); 434 } else 435 sc->sc_state &= ~TOUT; 436 437 if (sc->sc_state & EERROR) 438 sc->sc_state &= ~EERROR; 439 440 /* 441 * Avoid possible hangs due to missed interrupts 442 */ 443 if (sc->sc_xfercnt) { 444 lptintr(dev); 445 } else { 446 sc->sc_state &= ~OBUSY; 447 wakeup((caddr_t)dev); 448 } 449} 450 451/* 452 * lptopen -- reset the printer, then wait until it's selected and not busy. 453 * If LP_BYPASS flag is selected, then we do not try to select the 454 * printer -- this is just used for passing ioctls. 455 */ 456 457static int 458lptopen(dev_t dev, int flags, int fmt, struct proc *p) 459{ 460 int s; 461 int trys, err; 462 u_int unit = LPTUNIT(minor(dev)); 463 struct lpt_data *sc = UNITOSOFTC(unit); 464 device_t lptdev = UNITODEVICE(unit); 465 device_t ppbus = device_get_parent(lptdev); 466 467 if (!sc) 468 return (ENXIO); 469 470 if (sc->sc_state) { 471 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 472 return(EBUSY); 473 } else 474 sc->sc_state |= LPTINIT; 475 476 sc->sc_flags = LPTFLAGS(minor(dev)); 477 478 /* Check for open with BYPASS flag set. */ 479 if (sc->sc_flags & LP_BYPASS) { 480 sc->sc_state = OPEN; 481 return(0); 482 } 483 484 /* request the ppbus only if we don't have it already */ 485 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 486 /* give it a chance to try later */ 487 sc->sc_state = 0; 488 return (err); 489 } 490 491 s = spltty(); 492 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 493 494 /* set IRQ status according to ENABLE_IRQ flag 495 */ 496 if (sc->sc_irq & LP_ENABLE_IRQ) 497 sc->sc_irq |= LP_USE_IRQ; 498 else 499 sc->sc_irq &= ~LP_USE_IRQ; 500 501 /* init printer */ 502 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 503 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 504 ppb_wctr(ppbus, 0); 505 sc->sc_primed++; 506 DELAY(500); 507 } 508 } 509 510 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 511 512 /* wait till ready (printer running diagnostics) */ 513 trys = 0; 514 do { 515 /* ran out of waiting for the printer */ 516 if (trys++ >= LPINITRDY*4) { 517 splx(s); 518 sc->sc_state = 0; 519 lprintf(("status %x\n", ppb_rstr(ppbus))); 520 521 lpt_release_ppbus(lptdev); 522 return (EBUSY); 523 } 524 525 /* wait 1/4 second, give up if we get a signal */ 526 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, "lptinit", hz/4) != 527 EWOULDBLOCK) { 528 sc->sc_state = 0; 529 splx(s); 530 531 lpt_release_ppbus(lptdev); 532 return (EBUSY); 533 } 534 535 /* is printer online and ready for output */ 536 } while ((ppb_rstr(ppbus) & 537 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 538 (LPS_SEL|LPS_NBSY|LPS_NERR)); 539 540 sc->sc_control = LPC_SEL|LPC_NINIT; 541 if (sc->sc_flags & LP_AUTOLF) 542 sc->sc_control |= LPC_AUTOL; 543 544 /* enable interrupt if interrupt-driven */ 545 if (sc->sc_irq & LP_USE_IRQ) 546 sc->sc_control |= LPC_ENA; 547 548 ppb_wctr(ppbus, sc->sc_control); 549 550 sc->sc_state = OPEN; 551 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 552 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK); 553 sc->sc_xfercnt = 0; 554 splx(s); 555 556 /* release the ppbus */ 557 lpt_release_ppbus(lptdev); 558 559 /* only use timeout if using interrupt */ 560 lprintf(("irq %x\n", sc->sc_irq)); 561 if (sc->sc_irq & LP_USE_IRQ) { 562 sc->sc_state |= TOUT; 563 timeout(lptout, (caddr_t)lptdev, 564 (sc->sc_backoff = hz/LPTOUTINITIAL)); 565 } 566 567 lprintf(("opened.\n")); 568 return(0); 569} 570 571/* 572 * lptclose -- close the device, free the local line buffer. 573 * 574 * Check for interrupted write call added. 575 */ 576 577static int 578lptclose(dev_t dev, int flags, int fmt, struct proc *p) 579{ 580 u_int unit = LPTUNIT(minor(dev)); 581 struct lpt_data *sc = UNITOSOFTC(unit); 582 device_t lptdev = UNITODEVICE(unit); 583 device_t ppbus = device_get_parent(lptdev); 584 int err; 585 586 if(sc->sc_flags & LP_BYPASS) 587 goto end_close; 588 589 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 590 return (err); 591 592 sc->sc_state &= ~OPEN; 593 594 /* if the last write was interrupted, don't complete it */ 595 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 596 while ((ppb_rstr(ppbus) & 597 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 598 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 599 /* wait 1/4 second, give up if we get a signal */ 600 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, 601 "lpclose", hz) != EWOULDBLOCK) 602 break; 603 604 ppb_wctr(ppbus, LPC_NINIT); 605 free(sc->sc_inbuf, M_DEVBUF); 606 free(sc->sc_statbuf, M_DEVBUF); 607 608end_close: 609 /* release the bus anyway 610 * unregistration of interrupt forced by release 611 */ 612 lpt_release_ppbus(lptdev); 613 614 sc->sc_state = 0; 615 sc->sc_xfercnt = 0; 616 lprintf(("closed.\n")); 617 return(0); 618} 619 620/* 621 * lpt_pushbytes() 622 * Workhorse for actually spinning and writing bytes to printer 623 * Derived from lpa.c 624 * Originally by ? 625 * 626 * This code is only used when we are polling the port 627 */ 628static int 629lpt_pushbytes(device_t dev) 630{ 631 struct lpt_data *sc = DEVTOSOFTC(dev); 632 device_t ppbus = device_get_parent(dev); 633 int spin, err, tic; 634 char ch; 635 636 lprintf(("p")); 637 /* loop for every character .. */ 638 while (sc->sc_xfercnt > 0) { 639 /* printer data */ 640 ch = *(sc->sc_cp); 641 sc->sc_cp++; 642 sc->sc_xfercnt--; 643 644 /* 645 * Wait for printer ready. 646 * Loop 20 usecs testing BUSY bit, then sleep 647 * for exponentially increasing timeout. (vak) 648 */ 649 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 650 DELAY(1); /* XXX delay is NOT this accurate! */ 651 if (spin >= MAX_SPIN) { 652 tic = 0; 653 while (NOT_READY(ppbus)) { 654 /* 655 * Now sleep, every cycle a 656 * little longer .. 657 */ 658 tic = tic + tic + 1; 659 /* 660 * But no more than 10 seconds. (vak) 661 */ 662 if (tic > MAX_SLEEP) 663 tic = MAX_SLEEP; 664 err = tsleep((caddr_t)dev, LPPRI, 665 LPT_NAME "poll", tic); 666 if (err != EWOULDBLOCK) { 667 return (err); 668 } 669 } 670 } 671 672 /* output data */ 673 ppb_wdtr(ppbus, ch); 674 /* strobe */ 675 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 676 ppb_wctr(ppbus, sc->sc_control); 677 678 } 679 return(0); 680} 681 682/* 683 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 684 */ 685 686static int 687lptread(dev_t dev, struct uio *uio, int ioflag) 688{ 689 u_int unit = LPTUNIT(minor(dev)); 690 struct lpt_data *sc = UNITOSOFTC(unit); 691 device_t lptdev = UNITODEVICE(unit); 692 device_t ppbus = device_get_parent(lptdev); 693 int error = 0, len; 694 695 if (sc->sc_flags & LP_BYPASS) { 696 /* we can't do reads in bypass mode */ 697 return (EPERM); 698 } 699 700 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 701 return (error); 702 703 /* read data in an other buffer, read/write may be simultaneous */ 704 len = 0; 705 while (uio->uio_resid) { 706 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 707 sc->sc_statbuf, min(BUFSTATSIZE, 708 uio->uio_resid), &len))) { 709 goto error; 710 } 711 712 if (!len) 713 goto error; /* no more data */ 714 715 if ((error = uiomove(sc->sc_statbuf, len, uio))) 716 goto error; 717 } 718 719error: 720 ppb_1284_terminate(ppbus); 721 return (error); 722} 723 724/* 725 * lptwrite --copy a line from user space to a local buffer, then call 726 * putc to get the chars moved to the output queue. 727 * 728 * Flagging of interrupted write added. 729 */ 730 731static int 732lptwrite(dev_t dev, struct uio *uio, int ioflag) 733{ 734 register unsigned n; 735 int err; 736 u_int unit = LPTUNIT(minor(dev)); 737 struct lpt_data *sc = UNITOSOFTC(unit); 738 device_t lptdev = UNITODEVICE(unit); 739 device_t ppbus = device_get_parent(lptdev); 740 741 if(sc->sc_flags & LP_BYPASS) { 742 /* we can't do writes in bypass mode */ 743 return(EPERM); 744 } 745 746 /* request the ppbus only if we don't have it already */ 747 /* XXX interrupt registration?! */ 748 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 749 return (err); 750 751 /* if interrupts are working, register the handler */ 752 if (sc->sc_irq & LP_USE_IRQ) { 753 /* register our interrupt handler */ 754 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 755 INTR_TYPE_TTY, lpt_intr, lptdev, 756 &sc->intr_cookie); 757 if (err) { 758 device_printf(lptdev, "handler registration failed, polled mode.\n"); 759 sc->sc_irq &= ~LP_USE_IRQ; 760 } 761 } 762 763 sc->sc_state &= ~INTERRUPTED; 764 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 765 sc->sc_cp = sc->sc_inbuf; 766 uiomove(sc->sc_cp, n, uio); 767 sc->sc_xfercnt = n ; 768 769 if (sc->sc_irq & LP_ENABLE_EXT) { 770 /* try any extended mode */ 771 err = ppb_write(ppbus, sc->sc_cp, 772 sc->sc_xfercnt, 0); 773 switch (err) { 774 case 0: 775 /* if not all data was sent, we could rely 776 * on polling for the last bytes */ 777 sc->sc_xfercnt = 0; 778 break; 779 case EINTR: 780 sc->sc_state |= INTERRUPTED; 781 return(err); 782 case EINVAL: 783 /* advanced mode not avail */ 784 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 785 break; 786 default: 787 return(err); 788 } 789 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 790 lprintf(("i")); 791 /* if the printer is ready for a char, */ 792 /* give it one */ 793 if ((sc->sc_state & OBUSY) == 0){ 794 lprintf(("\nC %d. ", sc->sc_xfercnt)); 795 lptintr(lptdev); 796 } 797 lprintf(("W ")); 798 if (sc->sc_state & OBUSY) 799 if ((err = tsleep((caddr_t)lptdev, 800 LPPRI|PCATCH, LPT_NAME "write", 0))) { 801 sc->sc_state |= INTERRUPTED; 802 return(err); 803 } 804 } 805 806 /* check to see if we must do a polled write */ 807 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 808 lprintf(("p")); 809 810 err = lpt_pushbytes(lptdev); 811 812 if (err) 813 return(err); 814 } 815 } 816 817 /* we have not been interrupted, release the ppbus */ 818 lpt_release_ppbus(lptdev); 819 820 return(0); 821} 822 823/* 824 * lpt_intr -- handle printer interrupts which occur when the printer is 825 * ready to accept another char. 826 * 827 * do checking for interrupted write call. 828 */ 829 830static void 831lpt_intr(void *arg) 832{ 833 device_t lptdev = (device_t)arg; 834 device_t ppbus = device_get_parent(lptdev); 835 struct lpt_data *sc = DEVTOSOFTC(lptdev); 836 int sts = 0; 837 int i; 838 839 /* we must own the bus to use it */ 840 if ((sc->sc_state & HAVEBUS) == 0) 841 return; 842 843 /* 844 * Is printer online and ready for output? 845 * 846 * Avoid falling back to lptout() too quickly. First spin-loop 847 * to see if the printer will become ready ``really soon now''. 848 */ 849 for (i = 0; i < 100 && 850 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 851 852 if ((sts & RDY_MASK) == LP_READY) { 853 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 854 sc->sc_backoff = hz/LPTOUTINITIAL; 855 856 if (sc->sc_xfercnt) { 857 /* send char */ 858 /*lprintf(("%x ", *sc->sc_cp)); */ 859 ppb_wdtr(ppbus, *sc->sc_cp++) ; 860 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 861 /* DELAY(X) */ 862 ppb_wctr(ppbus, sc->sc_control); 863 864 /* any more data for printer */ 865 if(--(sc->sc_xfercnt) > 0) return; 866 } 867 868 /* 869 * No more data waiting for printer. 870 * Wakeup is not done if write call was not interrupted. 871 */ 872 sc->sc_state &= ~OBUSY; 873 874 if(!(sc->sc_state & INTERRUPTED)) 875 wakeup((caddr_t)lptdev); 876 lprintf(("w ")); 877 return; 878 } else { /* check for error */ 879 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 880 (sc->sc_state & OPEN)) 881 sc->sc_state |= EERROR; 882 /* lptout() will jump in and try to restart. */ 883 } 884 lprintf(("sts %x ", sts)); 885} 886 887static void 888lptintr(device_t dev) 889{ 890 /* call the interrupt at required spl level */ 891 int s = spltty(); 892 893 lpt_intr(dev); 894 895 splx(s); 896 return; 897} 898 899static int 900lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 901{ 902 int error = 0; 903 u_int unit = LPTUNIT(minor(dev)); 904 struct lpt_data *sc = UNITOSOFTC(unit); 905 u_char old_sc_irq; /* old printer IRQ status */ 906 907 switch (cmd) { 908 case LPT_IRQ : 909 if(sc->sc_irq & LP_HAS_IRQ) { 910 /* 911 * NOTE: 912 * If the IRQ status is changed, 913 * this will only be visible on the 914 * next open. 915 * 916 * If interrupt status changes, 917 * this gets syslog'd. 918 */ 919 old_sc_irq = sc->sc_irq; 920 switch(*(int*)data) { 921 case 0: 922 sc->sc_irq &= (~LP_ENABLE_IRQ); 923 break; 924 case 1: 925 sc->sc_irq &= (~LP_ENABLE_EXT); 926 sc->sc_irq |= LP_ENABLE_IRQ; 927 break; 928 case 2: 929 /* classic irq based transfer and advanced 930 * modes are in conflict 931 */ 932 sc->sc_irq &= (~LP_ENABLE_IRQ); 933 sc->sc_irq |= LP_ENABLE_EXT; 934 break; 935 case 3: 936 sc->sc_irq &= (~LP_ENABLE_EXT); 937 break; 938 default: 939 break; 940 } 941 942 if (old_sc_irq != sc->sc_irq ) 943 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 944 unit, 945 (sc->sc_irq & LP_ENABLE_IRQ)? 946 "interrupt-driven":"polled", 947 (sc->sc_irq & LP_ENABLE_EXT)? 948 "extended":"standard"); 949 } else /* polled port */ 950 error = EOPNOTSUPP; 951 break; 952 default: 953 error = ENODEV; 954 } 955 956 return(error); 957} 958 959static device_method_t lpt_methods[] = { 960 /* device interface */ 961 DEVMETHOD(device_identify, lpt_identify), 962 DEVMETHOD(device_probe, lpt_probe), 963 DEVMETHOD(device_attach, lpt_attach), 964 965 { 0, 0 } 966}; 967 968static driver_t lpt_driver = { 969 LPT_NAME, 970 lpt_methods, 971 sizeof(struct lpt_data), 972}; 973 974DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 975