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