lpt.c revision 111815
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 111815 2003-03-03 12:15:54Z 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 .d_open = lptopen, 193 .d_close = lptclose, 194 .d_read = lptread, 195 .d_write = lptwrite, 196 .d_ioctl = lptioctl, 197 .d_name = LPT_NAME, 198 .d_maj = CDEV_MAJOR, 199}; 200 201static int 202lpt_request_ppbus(device_t dev, int how) 203{ 204 device_t ppbus = device_get_parent(dev); 205 struct lpt_data *sc = DEVTOSOFTC(dev); 206 int error; 207 208 if (sc->sc_state & HAVEBUS) 209 return (0); 210 211 /* we have the bus only if the request succeded */ 212 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 213 sc->sc_state |= HAVEBUS; 214 215 return (error); 216} 217 218static int 219lpt_release_ppbus(device_t dev) 220{ 221 device_t ppbus = device_get_parent(dev); 222 struct lpt_data *sc = DEVTOSOFTC(dev); 223 int error = 0; 224 225 if ((error = ppb_release_bus(ppbus, dev)) == 0) 226 sc->sc_state &= ~HAVEBUS; 227 228 return (error); 229} 230 231/* 232 * Internal routine to lptprobe to do port tests of one byte value 233 */ 234static int 235lpt_port_test(device_t ppbus, u_char data, u_char mask) 236{ 237 int temp, timeout; 238 239 data = data & mask; 240 ppb_wdtr(ppbus, data); 241 timeout = 10000; 242 do { 243 DELAY(10); 244 temp = ppb_rdtr(ppbus) & mask; 245 } 246 while (temp != data && --timeout); 247 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 248 return (temp == data); 249} 250 251/* 252 * Probe simplified by replacing multiple loops with a hardcoded 253 * test pattern - 1999/02/08 des@freebsd.org 254 * 255 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 256 * Based partially on Rod Grimes' printer probe 257 * 258 * Logic: 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.) 264 * 265 * Comments from Rod's probe: 266 * Logic: 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. 270 * 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. 276 * 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. 279 * 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. 283 * 284 * We are finally left with a mask of 0x14, due to some printers 285 * being adamant about holding other bits high ........ 286 * 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 289 * gets toggled. 290 * 291 * 3) Set the data and control ports to a value of 0 292 * 293 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 294 * Epson FX-1170 and C.Itoh 8510RM 295 * printers. 296 * Quick exit on fail added. 297 */ 298static int 299lpt_detect(device_t dev) 300{ 301 device_t ppbus = device_get_parent(dev); 302 303 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 */ 310 }; 311 int i, error, status; 312 313 status = 1; /* assume success */ 314 315 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 316 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 317 status = 0; 318 goto end_probe; 319 } 320 321 for (i = 0; i < 18 && status; i++) 322 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 323 status = 0; 324 goto end_probe; 325 } 326 327end_probe: 328 /* write 0's to control and data ports */ 329 ppb_wdtr(ppbus, 0); 330 ppb_wctr(ppbus, 0); 331 332 lpt_release_ppbus(dev); 333 334 return (status); 335} 336 337static void 338lpt_identify(driver_t *driver, device_t parent) 339{ 340 341 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1); 342} 343 344/* 345 * lpt_probe() 346 */ 347static int 348lpt_probe(device_t dev) 349{ 350 struct lpt_data *sc; 351 352 sc = DEVTOSOFTC(dev); 353 bzero(sc, sizeof(struct lpt_data)); 354 355 /* 356 * Now, try to detect the printer. 357 */ 358 if (!lpt_detect(dev)) 359 return (ENXIO); 360 361 device_set_desc(dev, "Printer"); 362 363 return (0); 364} 365 366static int 367lpt_attach(device_t dev) 368{ 369 device_t ppbus = device_get_parent(dev); 370 struct lpt_data *sc = DEVTOSOFTC(dev); 371 int zero = 0, unit = device_get_unit(dev); 372 int error; 373 intptr_t irq; 374 375 sc->sc_primed = 0; /* not primed yet */ 376 377 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 378 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 379 return (0); 380 } 381 382 ppb_wctr(ppbus, LPC_NINIT); 383 384 /* check if we can use interrupt, should be done by ppc stuff */ 385 lprintf(("oldirq %x\n", sc->sc_irq)); 386 387 /* retrieve the ppbus irq */ 388 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 389 390 if (irq > 0) { 391 /* declare our interrupt handler */ 392 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 393 &zero, irq, irq, 1, RF_SHAREABLE); 394 } 395 if (sc->intr_resource) { 396 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 397 device_printf(dev, "Interrupt-driven port\n"); 398 } else { 399 sc->sc_irq = 0; 400 device_printf(dev, "Polled port\n"); 401 } 402 lprintf(("irq %x %x\n", (int)irq, sc->sc_irq)); 403 404 lpt_release_ppbus(dev); 405 406 make_dev(&lpt_cdevsw, unit, 407 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 408 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 409 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 410 return (0); 411} 412 413static void 414lptout(void *arg) 415{ 416 device_t dev = (device_t)arg; 417 struct lpt_data *sc = DEVTOSOFTC(dev); 418#ifdef LPT_DEBUG 419 device_t ppbus = device_get_parent(dev); 420#endif 421 422 lprintf(("T %x ", ppb_rstr(ppbus))); 423 if (sc->sc_state & OPEN) { 424 sc->sc_backoff++; 425 if (sc->sc_backoff > hz/LPTOUTMAX) 426 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 427 timeout(lptout, (caddr_t)dev, sc->sc_backoff); 428 } else 429 sc->sc_state &= ~TOUT; 430 431 if (sc->sc_state & EERROR) 432 sc->sc_state &= ~EERROR; 433 434 /* 435 * Avoid possible hangs due to missed interrupts 436 */ 437 if (sc->sc_xfercnt) { 438 lptintr(dev); 439 } else { 440 sc->sc_state &= ~OBUSY; 441 wakeup(dev); 442 } 443} 444 445/* 446 * lptopen -- reset the printer, then wait until it's selected and not busy. 447 * If LP_BYPASS flag is selected, then we do not try to select the 448 * printer -- this is just used for passing ioctls. 449 */ 450 451static int 452lptopen(dev_t dev, int flags, int fmt, struct thread *td) 453{ 454 int s; 455 int trys, err; 456 u_int unit = LPTUNIT(minor(dev)); 457 struct lpt_data *sc = UNITOSOFTC(unit); 458 device_t lptdev = UNITODEVICE(unit); 459 device_t ppbus = device_get_parent(lptdev); 460 461 if (!sc) 462 return (ENXIO); 463 464 if (sc->sc_state) { 465 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 466 return(EBUSY); 467 } else 468 sc->sc_state |= LPTINIT; 469 470 sc->sc_flags = LPTFLAGS(minor(dev)); 471 472 /* Check for open with BYPASS flag set. */ 473 if (sc->sc_flags & LP_BYPASS) { 474 sc->sc_state = OPEN; 475 return(0); 476 } 477 478 /* request the ppbus only if we don't have it already */ 479 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 480 /* give it a chance to try later */ 481 sc->sc_state = 0; 482 return (err); 483 } 484 485 s = spltty(); 486 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 487 488 /* set IRQ status according to ENABLE_IRQ flag 489 */ 490 if (sc->sc_irq & LP_ENABLE_IRQ) 491 sc->sc_irq |= LP_USE_IRQ; 492 else 493 sc->sc_irq &= ~LP_USE_IRQ; 494 495 /* init printer */ 496 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 497 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 498 ppb_wctr(ppbus, 0); 499 sc->sc_primed++; 500 DELAY(500); 501 } 502 } 503 504 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 505 506 /* wait till ready (printer running diagnostics) */ 507 trys = 0; 508 do { 509 /* ran out of waiting for the printer */ 510 if (trys++ >= LPINITRDY*4) { 511 splx(s); 512 sc->sc_state = 0; 513 lprintf(("status %x\n", ppb_rstr(ppbus))); 514 515 lpt_release_ppbus(lptdev); 516 return (EBUSY); 517 } 518 519 /* wait 1/4 second, give up if we get a signal */ 520 if (tsleep(lptdev, LPPRI|PCATCH, "lptinit", hz/4) != 521 EWOULDBLOCK) { 522 sc->sc_state = 0; 523 splx(s); 524 525 lpt_release_ppbus(lptdev); 526 return (EBUSY); 527 } 528 529 /* is printer online and ready for output */ 530 } while ((ppb_rstr(ppbus) & 531 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 532 (LPS_SEL|LPS_NBSY|LPS_NERR)); 533 534 sc->sc_control = LPC_SEL|LPC_NINIT; 535 if (sc->sc_flags & LP_AUTOLF) 536 sc->sc_control |= LPC_AUTOL; 537 538 /* enable interrupt if interrupt-driven */ 539 if (sc->sc_irq & LP_USE_IRQ) 540 sc->sc_control |= LPC_ENA; 541 542 ppb_wctr(ppbus, sc->sc_control); 543 544 sc->sc_state = OPEN; 545 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 546 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK); 547 sc->sc_xfercnt = 0; 548 splx(s); 549 550 /* release the ppbus */ 551 lpt_release_ppbus(lptdev); 552 553 /* only use timeout if using interrupt */ 554 lprintf(("irq %x\n", sc->sc_irq)); 555 if (sc->sc_irq & LP_USE_IRQ) { 556 sc->sc_state |= TOUT; 557 timeout(lptout, (caddr_t)lptdev, 558 (sc->sc_backoff = hz/LPTOUTINITIAL)); 559 } 560 561 lprintf(("opened.\n")); 562 return(0); 563} 564 565/* 566 * lptclose -- close the device, free the local line buffer. 567 * 568 * Check for interrupted write call added. 569 */ 570 571static int 572lptclose(dev_t dev, int flags, int fmt, struct thread *td) 573{ 574 u_int unit = LPTUNIT(minor(dev)); 575 struct lpt_data *sc = UNITOSOFTC(unit); 576 device_t lptdev = UNITODEVICE(unit); 577 device_t ppbus = device_get_parent(lptdev); 578 int err; 579 580 if(sc->sc_flags & LP_BYPASS) 581 goto end_close; 582 583 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 584 return (err); 585 586 sc->sc_state &= ~OPEN; 587 588 /* if the last write was interrupted, don't complete it */ 589 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 590 while ((ppb_rstr(ppbus) & 591 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 592 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 593 /* wait 1/4 second, give up if we get a signal */ 594 if (tsleep(lptdev, LPPRI|PCATCH, 595 "lpclose", hz) != EWOULDBLOCK) 596 break; 597 598 ppb_wctr(ppbus, LPC_NINIT); 599 free(sc->sc_inbuf, M_DEVBUF); 600 free(sc->sc_statbuf, M_DEVBUF); 601 602end_close: 603 /* release the bus anyway 604 * unregistration of interrupt forced by release 605 */ 606 lpt_release_ppbus(lptdev); 607 608 sc->sc_state = 0; 609 sc->sc_xfercnt = 0; 610 lprintf(("closed.\n")); 611 return(0); 612} 613 614/* 615 * lpt_pushbytes() 616 * Workhorse for actually spinning and writing bytes to printer 617 * Derived from lpa.c 618 * Originally by ? 619 * 620 * This code is only used when we are polling the port 621 */ 622static int 623lpt_pushbytes(device_t dev) 624{ 625 struct lpt_data *sc = DEVTOSOFTC(dev); 626 device_t ppbus = device_get_parent(dev); 627 int spin, err, tic; 628 char ch; 629 630 lprintf(("p")); 631 /* loop for every character .. */ 632 while (sc->sc_xfercnt > 0) { 633 /* printer data */ 634 ch = *(sc->sc_cp); 635 sc->sc_cp++; 636 sc->sc_xfercnt--; 637 638 /* 639 * Wait for printer ready. 640 * Loop 20 usecs testing BUSY bit, then sleep 641 * for exponentially increasing timeout. (vak) 642 */ 643 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 644 DELAY(1); /* XXX delay is NOT this accurate! */ 645 if (spin >= MAX_SPIN) { 646 tic = 0; 647 while (NOT_READY(ppbus)) { 648 /* 649 * Now sleep, every cycle a 650 * little longer .. 651 */ 652 tic = tic + tic + 1; 653 /* 654 * But no more than 10 seconds. (vak) 655 */ 656 if (tic > MAX_SLEEP) 657 tic = MAX_SLEEP; 658 err = tsleep(dev, LPPRI, 659 LPT_NAME "poll", tic); 660 if (err != EWOULDBLOCK) { 661 return (err); 662 } 663 } 664 } 665 666 /* output data */ 667 ppb_wdtr(ppbus, ch); 668 /* strobe */ 669 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 670 ppb_wctr(ppbus, sc->sc_control); 671 672 } 673 return(0); 674} 675 676/* 677 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 678 */ 679 680static int 681lptread(dev_t dev, struct uio *uio, int ioflag) 682{ 683 u_int unit = LPTUNIT(minor(dev)); 684 struct lpt_data *sc = UNITOSOFTC(unit); 685 device_t lptdev = UNITODEVICE(unit); 686 device_t ppbus = device_get_parent(lptdev); 687 int error = 0, len; 688 689 if (sc->sc_flags & LP_BYPASS) { 690 /* we can't do reads in bypass mode */ 691 return (EPERM); 692 } 693 694 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 695 return (error); 696 697 /* read data in an other buffer, read/write may be simultaneous */ 698 len = 0; 699 while (uio->uio_resid) { 700 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 701 sc->sc_statbuf, min(BUFSTATSIZE, 702 uio->uio_resid), &len))) { 703 goto error; 704 } 705 706 if (!len) 707 goto error; /* no more data */ 708 709 if ((error = uiomove(sc->sc_statbuf, len, uio))) 710 goto error; 711 } 712 713error: 714 ppb_1284_terminate(ppbus); 715 return (error); 716} 717 718/* 719 * lptwrite --copy a line from user space to a local buffer, then call 720 * putc to get the chars moved to the output queue. 721 * 722 * Flagging of interrupted write added. 723 */ 724 725static int 726lptwrite(dev_t dev, struct uio *uio, int ioflag) 727{ 728 register unsigned n; 729 int err; 730 u_int unit = LPTUNIT(minor(dev)); 731 struct lpt_data *sc = UNITOSOFTC(unit); 732 device_t lptdev = UNITODEVICE(unit); 733 device_t ppbus = device_get_parent(lptdev); 734 735 if(sc->sc_flags & LP_BYPASS) { 736 /* we can't do writes in bypass mode */ 737 return(EPERM); 738 } 739 740 /* request the ppbus only if we don't have it already */ 741 /* XXX interrupt registration?! */ 742 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 743 return (err); 744 745 /* if interrupts are working, register the handler */ 746 if (sc->sc_irq & LP_USE_IRQ) { 747 /* register our interrupt handler */ 748 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 749 INTR_TYPE_TTY, lpt_intr, lptdev, 750 &sc->intr_cookie); 751 if (err) { 752 device_printf(lptdev, "handler registration failed, polled mode.\n"); 753 sc->sc_irq &= ~LP_USE_IRQ; 754 } 755 } 756 757 sc->sc_state &= ~INTERRUPTED; 758 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 759 sc->sc_cp = sc->sc_inbuf; 760 uiomove(sc->sc_cp, n, uio); 761 sc->sc_xfercnt = n ; 762 763 if (sc->sc_irq & LP_ENABLE_EXT) { 764 /* try any extended mode */ 765 err = ppb_write(ppbus, sc->sc_cp, 766 sc->sc_xfercnt, 0); 767 switch (err) { 768 case 0: 769 /* if not all data was sent, we could rely 770 * on polling for the last bytes */ 771 sc->sc_xfercnt = 0; 772 break; 773 case EINTR: 774 sc->sc_state |= INTERRUPTED; 775 return(err); 776 case EINVAL: 777 /* advanced mode not avail */ 778 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 779 break; 780 default: 781 return(err); 782 } 783 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 784 lprintf(("i")); 785 /* if the printer is ready for a char, */ 786 /* give it one */ 787 if ((sc->sc_state & OBUSY) == 0){ 788 lprintf(("\nC %d. ", sc->sc_xfercnt)); 789 lptintr(lptdev); 790 } 791 lprintf(("W ")); 792 if (sc->sc_state & OBUSY) 793 if ((err = tsleep(lptdev, 794 LPPRI|PCATCH, LPT_NAME "write", 0))) { 795 sc->sc_state |= INTERRUPTED; 796 return(err); 797 } 798 } 799 800 /* check to see if we must do a polled write */ 801 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 802 lprintf(("p")); 803 804 err = lpt_pushbytes(lptdev); 805 806 if (err) 807 return(err); 808 } 809 } 810 811 /* we have not been interrupted, release the ppbus */ 812 lpt_release_ppbus(lptdev); 813 814 return(0); 815} 816 817/* 818 * lpt_intr -- handle printer interrupts which occur when the printer is 819 * ready to accept another char. 820 * 821 * do checking for interrupted write call. 822 */ 823 824static void 825lpt_intr(void *arg) 826{ 827 device_t lptdev = (device_t)arg; 828 device_t ppbus = device_get_parent(lptdev); 829 struct lpt_data *sc = DEVTOSOFTC(lptdev); 830 int sts = 0; 831 int i; 832 833 /* we must own the bus to use it */ 834 if ((sc->sc_state & HAVEBUS) == 0) 835 return; 836 837 /* 838 * Is printer online and ready for output? 839 * 840 * Avoid falling back to lptout() too quickly. First spin-loop 841 * to see if the printer will become ready ``really soon now''. 842 */ 843 for (i = 0; i < 100 && 844 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 845 846 if ((sts & RDY_MASK) == LP_READY) { 847 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 848 sc->sc_backoff = hz/LPTOUTINITIAL; 849 850 if (sc->sc_xfercnt) { 851 /* send char */ 852 /*lprintf(("%x ", *sc->sc_cp)); */ 853 ppb_wdtr(ppbus, *sc->sc_cp++) ; 854 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 855 /* DELAY(X) */ 856 ppb_wctr(ppbus, sc->sc_control); 857 858 /* any more data for printer */ 859 if(--(sc->sc_xfercnt) > 0) return; 860 } 861 862 /* 863 * No more data waiting for printer. 864 * Wakeup is not done if write call was not interrupted. 865 */ 866 sc->sc_state &= ~OBUSY; 867 868 if(!(sc->sc_state & INTERRUPTED)) 869 wakeup(lptdev); 870 lprintf(("w ")); 871 return; 872 } else { /* check for error */ 873 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 874 (sc->sc_state & OPEN)) 875 sc->sc_state |= EERROR; 876 /* lptout() will jump in and try to restart. */ 877 } 878 lprintf(("sts %x ", sts)); 879} 880 881static void 882lptintr(device_t dev) 883{ 884 /* call the interrupt at required spl level */ 885 int s = spltty(); 886 887 lpt_intr(dev); 888 889 splx(s); 890 return; 891} 892 893static int 894lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *td) 895{ 896 int error = 0; 897 u_int unit = LPTUNIT(minor(dev)); 898 struct lpt_data *sc = UNITOSOFTC(unit); 899 u_char old_sc_irq; /* old printer IRQ status */ 900 901 switch (cmd) { 902 case LPT_IRQ : 903 if(sc->sc_irq & LP_HAS_IRQ) { 904 /* 905 * NOTE: 906 * If the IRQ status is changed, 907 * this will only be visible on the 908 * next open. 909 * 910 * If interrupt status changes, 911 * this gets syslog'd. 912 */ 913 old_sc_irq = sc->sc_irq; 914 switch(*(int*)data) { 915 case 0: 916 sc->sc_irq &= (~LP_ENABLE_IRQ); 917 break; 918 case 1: 919 sc->sc_irq &= (~LP_ENABLE_EXT); 920 sc->sc_irq |= LP_ENABLE_IRQ; 921 break; 922 case 2: 923 /* classic irq based transfer and advanced 924 * modes are in conflict 925 */ 926 sc->sc_irq &= (~LP_ENABLE_IRQ); 927 sc->sc_irq |= LP_ENABLE_EXT; 928 break; 929 case 3: 930 sc->sc_irq &= (~LP_ENABLE_EXT); 931 break; 932 default: 933 break; 934 } 935 936 if (old_sc_irq != sc->sc_irq ) 937 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 938 unit, 939 (sc->sc_irq & LP_ENABLE_IRQ)? 940 "interrupt-driven":"polled", 941 (sc->sc_irq & LP_ENABLE_EXT)? 942 "extended":"standard"); 943 } else /* polled port */ 944 error = EOPNOTSUPP; 945 break; 946 default: 947 error = ENODEV; 948 } 949 950 return(error); 951} 952 953static device_method_t lpt_methods[] = { 954 /* device interface */ 955 DEVMETHOD(device_identify, lpt_identify), 956 DEVMETHOD(device_probe, lpt_probe), 957 DEVMETHOD(device_attach, lpt_attach), 958 959 { 0, 0 } 960}; 961 962static driver_t lpt_driver = { 963 LPT_NAME, 964 lpt_methods, 965 sizeof(struct lpt_data), 966}; 967 968DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 969