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 /* stop */ nostop, 207 /* reset */ noreset, 208 /* devtotty */ nodevtotty, 209 /* poll */ nopoll, 210 /* mmap */ nommap, 211 /* strategy */ nostrategy, 212 /* name */ LPT_NAME, 213 /* parms */ noparms, 214 /* maj */ CDEV_MAJOR, 215 /* dump */ nodump, 216 /* psize */ nopsize, 217 /* flags */ 0, 218 /* maxio */ 0, 219 /* bmaj */ -1 220 }; 221 222 static int 223 lpt_request_ppbus(struct lpt_data *sc, int how) 224 { 225 int error; 226 227 if (sc->sc_state & HAVEBUS) 228 return (0); 229 230 /* we have the bus only if the request succeded */ 231 if ((error = ppb_request_bus(&sc->lpt_dev, how)) == 0) 232 sc->sc_state |= HAVEBUS; 233 234 return (error); 235 } 236 237 static int 238 lpt_release_ppbus(struct lpt_data *sc) 239 { 240 ppb_release_bus(&sc->lpt_dev); 241 sc->sc_state &= ~HAVEBUS; 242 243 return (0); 244 } 245 246 /* 247 * Internal routine to lptprobe to do port tests of one byte value 248 */ 249 static int 250 lpt_port_test(struct lpt_data *sc, u_char data, u_char mask) 251 { 252 int temp, timeout; 253 254 data = data & mask; 255 ppb_wdtr(&sc->lpt_dev, data); 256 timeout = 10000; 257 do { 258 DELAY(10); 259 temp = ppb_rdtr(&sc->lpt_dev) & mask; 260 } 261 while (temp != data && --timeout); 262 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 263 return (temp == data); 264 } 265 266 /* 267 * Probe simplified by replacing multiple loops with a hardcoded 268 * test pattern - 1999/02/08 des@freebsd.org 269 * 270 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 271 * Based partially on Rod Grimes' printer probe 272 * 273 * Logic: 274 * 1) If no port address was given, use the bios detected ports 275 * and autodetect what ports the printers are on. 276 * 2) Otherwise, probe the data port at the address given, 277 * using the method in Rod Grimes' port probe. 278 * (Much code ripped off directly from Rod's probe.) 279 * 280 * Comments from Rod's probe: 281 * Logic: 282 * 1) You should be able to write to and read back the same value 283 * to the data port. Do an alternating zeros, alternating ones, 284 * walking zero, and walking one test to check for stuck bits. 285 * 286 * 2) You should be able to write to and read back the same value 287 * to the control port lower 5 bits, the upper 3 bits are reserved 288 * per the IBM PC technical reference manauls and different boards 289 * do different things with them. Do an alternating zeros, alternating 290 * ones, walking zero, and walking one test to check for stuck bits. 291 * 292 * Some printers drag the strobe line down when the are powered off 293 * so this bit has been masked out of the control port test. 294 * 295 * XXX Some printers may not like a fast pulse on init or strobe, I 296 * don't know at this point, if that becomes a problem these bits 297 * should be turned off in the mask byte for the control port test. 298 * 299 * We are finally left with a mask of 0x14, due to some printers 300 * being adamant about holding other bits high ........ 301 * 302 * Before probing the control port, we write a 0 to the data port - 303 * If not, some printers chuck out garbage when the strobe line 304 * gets toggled. 305 * 306 * 3) Set the data and control ports to a value of 0 307 * 308 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 309 * Epson FX-1170 and C.Itoh 8510RM 310 * printers. 311 * Quick exit on fail added. 312 */ 313 static int 314 lpt_detect(struct lpt_data *sc) 315 { 316 static u_char testbyte[18] = { 317 0x55, /* alternating zeros */ 318 0xaa, /* alternating ones */ 319 0xfe, 0xfd, 0xfb, 0xf7, 320 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 321 0x01, 0x02, 0x04, 0x08, 322 0x10, 0x20, 0x40, 0x80 /* walking one */ 323 }; 324 int i, error, status; 325 326 status = 1; /* assume success */ 327 328 if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) { 329 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 330 status = 0; 331 goto end_probe; 332 } 333 334 for (i = 0; i < 18 && status; i++) 335 if (!lpt_port_test(sc, testbyte[i], 0xff)) { 336 status = 0; 337 goto end_probe; 338 } 339 340 end_probe: 341 /* write 0's to control and data ports */ 342 ppb_wdtr(&sc->lpt_dev, 0); 343 ppb_wctr(&sc->lpt_dev, 0); 344 345 lpt_release_ppbus(sc); 346 347 return (status); 348 } 349 350 /* 351 * lptprobe() 352 */ 353 static struct ppb_device * 354 lptprobe(struct ppb_data *ppb) 355 { 356 struct lpt_data *sc; 357 static int once; 358 359 if (!once++) 360 cdevsw_add(&lpt_cdevsw); 361 362 sc = (struct lpt_data *) malloc(sizeof(struct lpt_data), 363 M_TEMP, M_NOWAIT); 364 if (!sc) { 365 printf(LPT_NAME ": cannot malloc!\n"); 366 return (0); 367 } 368 bzero(sc, sizeof(struct lpt_data)); 369 370 lptdata[nlpt] = sc; 371 372 /* 373 * lpt dependent initialisation. 374 */ 375 sc->lpt_unit = nlpt; 376 377 /* 378 * ppbus dependent initialisation. 379 */ 380 sc->lpt_dev.id_unit = sc->lpt_unit; 381 sc->lpt_dev.name = lptdriver.name; 382 sc->lpt_dev.ppb = ppb; 383 sc->lpt_dev.intr = lptintr; 384 385 /* 386 * Now, try to detect the printer. 387 */ 388 if (!lpt_detect(sc)) { 389 free(sc, M_TEMP); 390 return (0); 391 } 392 393 /* Ok, go to next device on next probe */ 394 nlpt ++; 395 396 return (&sc->lpt_dev); 397 } 398 399 static int 400 lptattach(struct ppb_device *dev) 401 { 402 struct lpt_data *sc = lptdata[dev->id_unit]; 403 int error; 404 405 /* 406 * Report ourselves 407 */ 408 printf(LPT_NAME "%d: <generic printer> on ppbus %d\n", 409 dev->id_unit, dev->ppb->ppb_link->adapter_unit); 410 411 sc->sc_primed = 0; /* not primed yet */ 412 413 if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) { 414 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 415 return (0); 416 } 417 418 ppb_wctr(&sc->lpt_dev, LPC_NINIT); 419 420 /* check if we can use interrupt, should be done by ppc stuff */ 421 lprintf(("oldirq %x\n", sc->sc_irq)); 422 if (ppb_get_irq(&sc->lpt_dev)) { 423 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 424 printf(LPT_NAME "%d: Interrupt-driven port\n", dev->id_unit); 425 } else { 426 sc->sc_irq = 0; 427 lprintf((LPT_NAME "%d: Polled port\n", dev->id_unit)); 428 } 429 lprintf(("irq %x\n", sc->sc_irq)); 430 431 lpt_release_ppbus(sc); 432 433 make_dev(&lpt_cdevsw, dev->id_unit, 434 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", dev->id_unit); 435 make_dev(&lpt_cdevsw, dev->id_unit | LP_BYPASS, 436 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", dev->id_unit); 437 return (1); 438 } 439 440 static void 441 lptout(void *arg) 442 { 443 struct lpt_data *sc = arg; 444 int pl; 445 446 lprintf(("T %x ", ppb_rstr(&sc->lpt_dev))); 447 if (sc->sc_state & OPEN) { 448 sc->sc_backoff++; 449 if (sc->sc_backoff > hz/LPTOUTMAX) 450 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 451 timeout(lptout, (caddr_t)sc, sc->sc_backoff); 452 } else 453 sc->sc_state &= ~TOUT; 454 455 if (sc->sc_state & EERROR) 456 sc->sc_state &= ~EERROR; 457 458 /* 459 * Avoid possible hangs do to missed interrupts 460 */ 461 if (sc->sc_xfercnt) { 462 pl = spltty(); 463 lpt_intr(sc->lpt_unit); 464 splx(pl); 465 } else { 466 sc->sc_state &= ~OBUSY; 467 wakeup((caddr_t)sc); 468 } 469 } 470 471 /* 472 * lptopen -- reset the printer, then wait until it's selected and not busy. 473 * If LP_BYPASS flag is selected, then we do not try to select the 474 * printer -- this is just used for passing ioctls. 475 */ 476 477 static int 478 lptopen(dev_t dev, int flags, int fmt, struct proc *p) 479 { 480 struct lpt_data *sc; 481 482 int s; 483 int trys, err; 484 u_int unit = LPTUNIT(minor(dev)); 485 486 if ((unit >= nlpt)) 487 return (ENXIO); 488 489 sc = lptdata[unit]; 490 491 if (sc->sc_state) { 492 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 493 return(EBUSY); 494 } else 495 sc->sc_state |= LPTINIT; 496 497 sc->sc_flags = LPTFLAGS(minor(dev)); 498 499 /* Check for open with BYPASS flag set. */ 500 if (sc->sc_flags & LP_BYPASS) { 501 sc->sc_state = OPEN; 502 return(0); 503 } 504 505 /* request the ppbus only if we don't have it already */ 506 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0) 507 return (err); 508 509 s = spltty(); 510 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 511 512 /* set IRQ status according to ENABLE_IRQ flag */ 513 if (sc->sc_irq & LP_ENABLE_IRQ) 514 sc->sc_irq |= LP_USE_IRQ; 515 else 516 sc->sc_irq &= ~LP_USE_IRQ; 517 518 /* init printer */ 519 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 520 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 521 ppb_wctr(&sc->lpt_dev, 0); 522 sc->sc_primed++; 523 DELAY(500); 524 } 525 } 526 527 ppb_wctr(&sc->lpt_dev, LPC_SEL|LPC_NINIT); 528 529 /* wait till ready (printer running diagnostics) */ 530 trys = 0; 531 do { 532 /* ran out of waiting for the printer */ 533 if (trys++ >= LPINITRDY*4) { 534 splx(s); 535 sc->sc_state = 0; 536 lprintf(("status %x\n", ppb_rstr(&sc->lpt_dev))); 537 538 lpt_release_ppbus(sc); 539 return (EBUSY); 540 } 541 542 /* wait 1/4 second, give up if we get a signal */ 543 if (tsleep((caddr_t)sc, LPPRI|PCATCH, "lptinit", hz/4) != 544 EWOULDBLOCK) { 545 sc->sc_state = 0; 546 splx(s); 547 548 lpt_release_ppbus(sc); 549 return (EBUSY); 550 } 551 552 /* is printer online and ready for output */ 553 } while ((ppb_rstr(&sc->lpt_dev) & 554 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 555 (LPS_SEL|LPS_NBSY|LPS_NERR)); 556 557 sc->sc_control = LPC_SEL|LPC_NINIT; 558 if (sc->sc_flags & LP_AUTOLF) 559 sc->sc_control |= LPC_AUTOL; 560 561 /* enable interrupt if interrupt-driven */ 562 if (sc->sc_irq & LP_USE_IRQ) 563 sc->sc_control |= LPC_ENA; 564 565 ppb_wctr(&sc->lpt_dev, sc->sc_control); 566 567 sc->sc_state = OPEN; 568 sc->sc_inbuf = geteblk(BUFSIZE); 569 sc->sc_statbuf = geteblk(BUFSTATSIZE); 570 sc->sc_xfercnt = 0; 571 splx(s); 572 573 /* release the ppbus */ 574 lpt_release_ppbus(sc); 575 576 /* only use timeout if using interrupt */ 577 lprintf(("irq %x\n", sc->sc_irq)); 578 if (sc->sc_irq & LP_USE_IRQ) { 579 sc->sc_state |= TOUT; 580 timeout(lptout, (caddr_t)sc, 581 (sc->sc_backoff = hz/LPTOUTINITIAL)); 582 } 583 584 lprintf(("opened.\n")); 585 return(0); 586 } 587 588 /* 589 * lptclose -- close the device, free the local line buffer. 590 * 591 * Check for interrupted write call added. 592 */ 593 594 static int 595 lptclose(dev_t dev, int flags, int fmt, struct proc *p) 596 { 597 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))]; 598 int err; 599 600 if(sc->sc_flags & LP_BYPASS) 601 goto end_close; 602 603 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0) 604 return (err); 605 606 sc->sc_state &= ~OPEN; 607 608 /* if the last write was interrupted, don't complete it */ 609 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 610 while ((ppb_rstr(&sc->lpt_dev) & 611 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 612 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 613 /* wait 1/4 second, give up if we get a signal */ 614 if (tsleep((caddr_t)sc, LPPRI|PCATCH, 615 "lpclose", hz) != EWOULDBLOCK) 616 break; 617 618 ppb_wctr(&sc->lpt_dev, LPC_NINIT); 619 brelse(sc->sc_inbuf); 620 brelse(sc->sc_statbuf); 621 622 end_close: 623 /* release the bus anyway */ 624 lpt_release_ppbus(sc); 625 626 sc->sc_state = 0; 627 sc->sc_xfercnt = 0; 628 lprintf(("closed.\n")); 629 return(0); 630 } 631 632 /* 633 * lpt_pushbytes() 634 * Workhorse for actually spinning and writing bytes to printer 635 * Derived from lpa.c 636 * Originally by ? 637 * 638 * This code is only used when we are polling the port 639 */ 640 static int 641 lpt_pushbytes(struct lpt_data *sc) 642 { 643 int spin, err, tic; 644 char ch; 645 646 lprintf(("p")); 647 /* loop for every character .. */ 648 while (sc->sc_xfercnt > 0) { 649 /* printer data */ 650 ch = *(sc->sc_cp); 651 sc->sc_cp++; 652 sc->sc_xfercnt--; 653 654 /* 655 * Wait for printer ready. 656 * Loop 20 usecs testing BUSY bit, then sleep 657 * for exponentially increasing timeout. (vak) 658 */ 659 for (spin = 0; NOT_READY(sc) && spin < MAX_SPIN; ++spin) 660 DELAY(1); /* XXX delay is NOT this accurate! */ 661 if (spin >= MAX_SPIN) { 662 tic = 0; 663 while (NOT_READY(sc)) { 664 /* 665 * Now sleep, every cycle a 666 * little longer .. 667 */ 668 tic = tic + tic + 1; 669 /* 670 * But no more than 10 seconds. (vak) 671 */ 672 if (tic > MAX_SLEEP) 673 tic = MAX_SLEEP; 674 err = tsleep((caddr_t)sc, LPPRI, 675 LPT_NAME "poll", tic); 676 if (err != EWOULDBLOCK) { 677 return (err); 678 } 679 } 680 } 681 682 /* output data */ 683 ppb_wdtr(&sc->lpt_dev, ch); 684 /* strobe */ 685 ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB); 686 ppb_wctr(&sc->lpt_dev, sc->sc_control); 687 688 } 689 return(0); 690 } 691 692 /* 693 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 694 */ 695 696 static int 697 lptread(dev_t dev, struct uio *uio, int ioflag) 698 { 699 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))]; 700 int error = 0, len; 701 702 if ((error = ppb_1284_negociate(&sc->lpt_dev, PPB_NIBBLE, 0))) 703 return (error); 704 705 /* read data in an other buffer, read/write may be simultaneous */ 706 len = 0; 707 while (uio->uio_resid) { 708 if ((error = ppb_1284_read(&sc->lpt_dev, PPB_NIBBLE, 709 sc->sc_statbuf->b_data, min(BUFSTATSIZE, 710 uio->uio_resid), &len))) { 711 goto error; 712 } 713 714 if (!len) 715 goto error; /* no more data */ 716 717 if ((error = uiomove(sc->sc_statbuf->b_data, len, uio))) 718 goto error; 719 } 720 721 error: 722 ppb_1284_terminate(&sc->lpt_dev); 723 return (error); 724 } 725 726 /* 727 * lptwrite --copy a line from user space to a local buffer, then call 728 * putc to get the chars moved to the output queue. 729 * 730 * Flagging of interrupted write added. 731 */ 732 733 static int 734 lptwrite(dev_t dev, struct uio *uio, int ioflag) 735 { 736 register unsigned n; 737 int pl, err; 738 u_int unit = LPTUNIT(minor(dev)); 739 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))]; 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 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0) 748 return (err); 749 750 sc->sc_state &= ~INTERRUPTED; 751 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 752 sc->sc_cp = sc->sc_inbuf->b_data ; 753 uiomove(sc->sc_cp, n, uio); 754 sc->sc_xfercnt = n ; 755 756 if (sc->sc_irq & LP_ENABLE_EXT) { 757 /* try any extended mode */ 758 err = ppb_write(&sc->lpt_dev, sc->sc_cp, 759 sc->sc_xfercnt, 0); 760 switch (err) { 761 case 0: 762 /* if not all data was sent, we could rely 763 * on polling for the last bytes */ 764 sc->sc_xfercnt = 0; 765 break; 766 case EINTR: 767 sc->sc_state |= INTERRUPTED; 768 return(err); 769 case EINVAL: 770 /* advanced mode not avail */ 771 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 772 break; 773 default: 774 return(err); 775 } 776 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 777 lprintf(("i")); 778 /* if the printer is ready for a char, */ 779 /* give it one */ 780 if ((sc->sc_state & OBUSY) == 0){ 781 lprintf(("\nC %d. ", sc->sc_xfercnt)); 782 pl = spltty(); 783 lpt_intr(sc->lpt_unit); 784 (void) splx(pl); 785 } 786 lprintf(("W ")); 787 if (sc->sc_state & OBUSY) 788 if ((err = tsleep((caddr_t)sc, 789 LPPRI|PCATCH, LPT_NAME "write", 0))) { 790 sc->sc_state |= INTERRUPTED; 791 return(err); 792 } 793 } 794 795 /* check to see if we must do a polled write */ 796 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 797 lprintf(("p")); 798 799 err = lpt_pushbytes(sc); 800 801 if (err) 802 return(err); 803 } 804 } 805 806 /* we have not been interrupted, release the ppbus */ 807 lpt_release_ppbus(sc); 808 809 return(0); 810 } 811 812 /* 813 * lpt_intr -- handle printer interrupts which occur when the printer is 814 * ready to accept another char. 815 * 816 * do checking for interrupted write call. 817 */ 818 819 static void 820 lpt_intr(int unit) 821 { 822 struct lpt_data *sc = lptdata[unit]; 823 int sts; 824 int i; 825 826 /* we must own the bus to use it */ 827 if ((sc->sc_state & HAVEBUS) == 0) 828 return; 829 830 /* 831 * Is printer online and ready for output? 832 * 833 * Avoid falling back to lptout() too quickly. First spin-loop 834 * to see if the printer will become ready ``really soon now''. 835 */ 836 for (i = 0; i < 100 && 837 ((sts=ppb_rstr(&sc->lpt_dev)) & RDY_MASK) != LP_READY; i++) ; 838 839 if ((sts & RDY_MASK) == LP_READY) { 840 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 841 sc->sc_backoff = hz/LPTOUTINITIAL; 842 843 if (sc->sc_xfercnt) { 844 /* send char */ 845 /*lprintf(("%x ", *sc->sc_cp)); */ 846 ppb_wdtr(&sc->lpt_dev, *sc->sc_cp++) ; 847 ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB); 848 /* DELAY(X) */ 849 ppb_wctr(&sc->lpt_dev, sc->sc_control); 850 851 /* any more data for printer */ 852 if(--(sc->sc_xfercnt) > 0) return; 853 } 854 855 /* 856 * No more data waiting for printer. 857 * Wakeup is not done if write call was interrupted. 858 */ 859 sc->sc_state &= ~OBUSY; 860 861 if(!(sc->sc_state & INTERRUPTED)) 862 wakeup((caddr_t)sc); 863 lprintf(("w ")); 864 return; 865 } else { /* check for error */ 866 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 867 (sc->sc_state & OPEN)) 868 sc->sc_state |= EERROR; 869 /* lptout() will jump in and try to restart. */ 870 } 871 lprintf(("sts %x ", sts)); 872 } 873 874 static void 875 lptintr(int unit) 876 { 877 /* call the interrupt at required spl level */ 878 int s = spltty(); 879 880 lpt_intr(unit); 881 882 splx(s); 883 return; 884 } 885 886 static int 887 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 888 { 889 int error = 0; 890 struct lpt_data *sc; 891 u_int unit = LPTUNIT(minor(dev)); 892 u_char old_sc_irq; /* old printer IRQ status */ 893 894 sc = lptdata[unit]; 895 896 switch (cmd) { 897 case LPT_IRQ : 898 if(sc->sc_irq & LP_HAS_IRQ) { 899 /* 900 * NOTE: 901 * If the IRQ status is changed, 902 * this will only be visible on the 903 * next open. 904 * 905 * If interrupt status changes, 906 * this gets syslog'd. 907 */ 908 old_sc_irq = sc->sc_irq; 909 switch(*(int*)data) { 910 case 0: 911 sc->sc_irq &= (~LP_ENABLE_IRQ); 912 break; 913 case 1: 914 sc->sc_irq &= (~LP_ENABLE_EXT); 915 sc->sc_irq |= LP_ENABLE_IRQ; 916 break; 917 case 2: 918 /* classic irq based transfer and advanced 919 * modes are in conflict 920 */ 921 sc->sc_irq &= (~LP_ENABLE_IRQ); 922 sc->sc_irq |= LP_ENABLE_EXT; 923 break; 924 case 3: 925 sc->sc_irq &= (~LP_ENABLE_EXT); 926 break; 927 default: 928 break; 929 } 930 931 if (old_sc_irq != sc->sc_irq ) 932 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 933 unit, 934 (sc->sc_irq & LP_ENABLE_IRQ)? 935 "interrupt-driven":"polled", 936 (sc->sc_irq & LP_ENABLE_EXT)? 937 "extended":"standard"); 938 } else /* polled port */ 939 error = EOPNOTSUPP; 940 break; 941 default: 942 error = ENODEV; 943 } 944 945 return(error); 946 } 947