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 * $Id: lpt.c,v 1.5 1999/05/31 11:24:56 phk Exp $ 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 #include "opt_devfs.h" 67 68 #include <sys/param.h> 69 #include <sys/systm.h> 70 #include <sys/conf.h> 71 #include <sys/buf.h> 72 #include <sys/kernel.h> 73 #include <sys/uio.h> 74 #include <sys/syslog.h> 75 #ifdef DEVFS 76 #include <sys/devfsext.h> 77 #endif /*DEVFS*/ 78 #include <sys/malloc.h> 79 80 #include <machine/clock.h> 81 #include <machine/lpt.h> 82 #endif /*KERNEL*/ 83 84 #include <dev/ppbus/ppbconf.h> 85 #include <dev/ppbus/ppb_1284.h> 86 #include <dev/ppbus/lpt.h> 87 88 #include "opt_lpt.h" 89 90 #ifndef LPT_DEBUG 91 #define lprintf(args) 92 #else 93 #define lprintf(args) \ 94 do { \ 95 if (lptflag) \ 96 printf args; \ 97 } while (0) 98 static int volatile lptflag = 1; 99 #endif 100 101 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 102 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 103 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 104 #define LPPRI (PZERO+8) 105 #define BUFSIZE 1024 106 #define BUFSTATSIZE 32 107 108 #define LPTUNIT(s) ((s)&0x03) 109 #define LPTFLAGS(s) ((s)&0xfc) 110 111 struct lpt_data { 112 unsigned short lpt_unit; 113 114 struct ppb_device lpt_dev; 115 116 short sc_state; 117 /* default case: negative prime, negative ack, handshake strobe, 118 prime once */ 119 u_char sc_control; 120 char sc_flags; 121 #define LP_POS_INIT 0x04 /* if we are a postive init signal */ 122 #define LP_POS_ACK 0x08 /* if we are a positive going ack */ 123 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 124 #define LP_PRIMEOPEN 0x20 /* prime on every open */ 125 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 126 #define LP_BYPASS 0x80 /* bypass printer ready checks */ 127 struct buf *sc_inbuf; 128 struct buf *sc_statbuf; 129 short sc_xfercnt ; 130 char sc_primed; 131 char *sc_cp ; 132 u_short sc_irq ; /* IRQ status of port */ 133 #define LP_HAS_IRQ 0x01 /* we have an irq available */ 134 #define LP_USE_IRQ 0x02 /* we are using our irq */ 135 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 136 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 137 u_char sc_backoff ; /* time to call lptout() again */ 138 139 #ifdef DEVFS 140 void *devfs_token; 141 void *devfs_token_ctl; 142 #endif 143 }; 144 145 static int nlpt = 0; 146 #define MAXLPT 8 /* XXX not much better! */ 147 static struct lpt_data *lptdata[MAXLPT]; 148 149 #define LPT_NAME "lpt" /* our official name */ 150 151 static timeout_t lptout; 152 static int lpt_port_test(struct lpt_data *sc, u_char data, u_char mask); 153 static int lpt_detect(struct lpt_data *sc); 154 155 /* 156 * Make ourselves visible as a ppbus driver 157 */ 158 159 static struct ppb_device *lptprobe(struct ppb_data *ppb); 160 static int lptattach(struct ppb_device *dev); 161 static void lptintr(int unit); 162 163 static void lpt_intr(int unit); /* without spls */ 164 165 #ifdef KERNEL 166 167 static struct ppb_driver lptdriver = { 168 lptprobe, lptattach, LPT_NAME 169 }; 170 DATA_SET(ppbdriver_set, lptdriver); 171 172 #endif /* KERNEL */ 173 174 /* bits for state */ 175 #define OPEN (1<<0) /* device is open */ 176 #define ASLP (1<<1) /* awaiting draining of printer */ 177 #define EERROR (1<<2) /* error was received from printer */ 178 #define OBUSY (1<<3) /* printer is busy doing output */ 179 #define LPTOUT (1<<4) /* timeout while not selected */ 180 #define TOUT (1<<5) /* timeout while not selected */ 181 #define LPTINIT (1<<6) /* waiting to initialize for open */ 182 #define INTERRUPTED (1<<7) /* write call was interrupted */ 183 184 #define HAVEBUS (1<<8) /* the driver owns the bus */ 185 186 187 /* status masks to interrogate printer status */ 188 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 189 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 190 191 /* Printer Ready condition - from lpa.c */ 192 /* Only used in polling code */ 193 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 194 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 195 #define NOT_READY(lpt) ((ppb_rstr(&(lpt)->lpt_dev)^LPS_INVERT)&LPS_MASK) 196 197 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 198 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 199 200 201 static d_open_t lptopen; 202 static d_close_t lptclose; 203 static d_write_t lptwrite; 204 static d_read_t lptread; 205 static d_ioctl_t lptioctl; 206 207 #define CDEV_MAJOR 16 208 static struct cdevsw lpt_cdevsw = { 209 /* open */ lptopen, 210 /* close */ lptclose, 211 /* read */ lptread, 212 /* write */ lptwrite, 213 /* ioctl */ lptioctl, 214 /* stop */ nostop, 215 /* reset */ noreset, 216 /* devtotty */ nodevtotty, 217 /* poll */ nopoll, 218 /* mmap */ nommap, 219 /* strategy */ nostrategy, 220 /* name */ LPT_NAME, 221 /* parms */ noparms, 222 /* maj */ CDEV_MAJOR, 223 /* dump */ nodump, 224 /* psize */ nopsize, 225 /* flags */ 0, 226 /* maxio */ 0, 227 /* bmaj */ -1 228 }; 229 230 static int 231 lpt_request_ppbus(struct lpt_data *sc, int how) 232 { 233 int error; 234 235 if (sc->sc_state & HAVEBUS) 236 return (0); 237 238 /* we have the bus only if the request succeded */ 239 if ((error = ppb_request_bus(&sc->lpt_dev, how)) == 0) 240 sc->sc_state |= HAVEBUS; 241 242 return (error); 243 } 244 245 static int 246 lpt_release_ppbus(struct lpt_data *sc) 247 { 248 ppb_release_bus(&sc->lpt_dev); 249 sc->sc_state &= ~HAVEBUS; 250 251 return (0); 252 } 253 254 /* 255 * Internal routine to lptprobe to do port tests of one byte value 256 */ 257 static int 258 lpt_port_test(struct lpt_data *sc, u_char data, u_char mask) 259 { 260 int temp, timeout; 261 262 data = data & mask; 263 ppb_wdtr(&sc->lpt_dev, data); 264 timeout = 10000; 265 do { 266 DELAY(10); 267 temp = ppb_rdtr(&sc->lpt_dev) & mask; 268 } 269 while (temp != data && --timeout); 270 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 271 return (temp == data); 272 } 273 274 /* 275 * Probe simplified by replacing multiple loops with a hardcoded 276 * test pattern - 1999/02/08 des@freebsd.org 277 * 278 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 279 * Based partially on Rod Grimes' printer probe 280 * 281 * Logic: 282 * 1) If no port address was given, use the bios detected ports 283 * and autodetect what ports the printers are on. 284 * 2) Otherwise, probe the data port at the address given, 285 * using the method in Rod Grimes' port probe. 286 * (Much code ripped off directly from Rod's probe.) 287 * 288 * Comments from Rod's probe: 289 * Logic: 290 * 1) You should be able to write to and read back the same value 291 * to the data port. Do an alternating zeros, alternating ones, 292 * walking zero, and walking one test to check for stuck bits. 293 * 294 * 2) You should be able to write to and read back the same value 295 * to the control port lower 5 bits, the upper 3 bits are reserved 296 * per the IBM PC technical reference manauls and different boards 297 * do different things with them. Do an alternating zeros, alternating 298 * ones, walking zero, and walking one test to check for stuck bits. 299 * 300 * Some printers drag the strobe line down when the are powered off 301 * so this bit has been masked out of the control port test. 302 * 303 * XXX Some printers may not like a fast pulse on init or strobe, I 304 * don't know at this point, if that becomes a problem these bits 305 * should be turned off in the mask byte for the control port test. 306 * 307 * We are finally left with a mask of 0x14, due to some printers 308 * being adamant about holding other bits high ........ 309 * 310 * Before probing the control port, we write a 0 to the data port - 311 * If not, some printers chuck out garbage when the strobe line 312 * gets toggled. 313 * 314 * 3) Set the data and control ports to a value of 0 315 * 316 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 317 * Epson FX-1170 and C.Itoh 8510RM 318 * printers. 319 * Quick exit on fail added. 320 */ 321 static int 322 lpt_detect(struct lpt_data *sc) 323 { 324 static u_char testbyte[18] = { 325 0x55, /* alternating zeros */ 326 0xaa, /* alternating ones */ 327 0xfe, 0xfd, 0xfb, 0xf7, 328 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 329 0x01, 0x02, 0x04, 0x08, 330 0x10, 0x20, 0x40, 0x80 /* walking one */ 331 }; 332 int i, error, status; 333 334 status = 1; /* assume success */ 335 336 if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) { 337 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 338 status = 0; 339 goto end_probe; 340 } 341 342 for (i = 0; i < 18 && status; i++) 343 if (!lpt_port_test(sc, testbyte[i], 0xff)) { 344 status = 0; 345 goto end_probe; 346 } 347 348 end_probe: 349 /* write 0's to control and data ports */ 350 ppb_wdtr(&sc->lpt_dev, 0); 351 ppb_wctr(&sc->lpt_dev, 0); 352 353 lpt_release_ppbus(sc); 354 355 return (status); 356 } 357 358 /* 359 * lptprobe() 360 */ 361 static struct ppb_device * 362 lptprobe(struct ppb_data *ppb) 363 { 364 struct lpt_data *sc; 365 static int once; 366 367 if (!once++) 368 cdevsw_add(&lpt_cdevsw); 369 370 sc = (struct lpt_data *) malloc(sizeof(struct lpt_data), 371 M_TEMP, M_NOWAIT); 372 if (!sc) { 373 printf(LPT_NAME ": cannot malloc!\n"); 374 return (0); 375 } 376 bzero(sc, sizeof(struct lpt_data)); 377 378 lptdata[nlpt] = sc; 379 380 /* 381 * lpt dependent initialisation. 382 */ 383 sc->lpt_unit = nlpt; 384 385 /* 386 * ppbus dependent initialisation. 387 */ 388 sc->lpt_dev.id_unit = sc->lpt_unit; 389 sc->lpt_dev.name = lptdriver.name; 390 sc->lpt_dev.ppb = ppb; 391 sc->lpt_dev.intr = lptintr; 392 393 /* 394 * Now, try to detect the printer. 395 */ 396 if (!lpt_detect(sc)) { 397 free(sc, M_TEMP); 398 return (0); 399 } 400 401 /* Ok, go to next device on next probe */ 402 nlpt ++; 403 404 return (&sc->lpt_dev); 405 } 406 407 static int 408 lptattach(struct ppb_device *dev) 409 { 410 struct lpt_data *sc = lptdata[dev->id_unit]; 411 int error; 412 413 /* 414 * Report ourselves 415 */ 416 printf(LPT_NAME "%d: <generic printer> on ppbus %d\n", 417 dev->id_unit, dev->ppb->ppb_link->adapter_unit); 418 419 sc->sc_primed = 0; /* not primed yet */ 420 421 if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) { 422 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 423 return (0); 424 } 425 426 ppb_wctr(&sc->lpt_dev, LPC_NINIT); 427 428 /* check if we can use interrupt, should be done by ppc stuff */ 429 lprintf(("oldirq %x\n", sc->sc_irq)); 430 if (ppb_get_irq(&sc->lpt_dev)) { 431 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 432 printf(LPT_NAME "%d: Interrupt-driven port\n", dev->id_unit); 433 } else { 434 sc->sc_irq = 0; 435 lprintf((LPT_NAME "%d: Polled port\n", dev->id_unit)); 436 } 437 lprintf(("irq %x\n", sc->sc_irq)); 438 439 lpt_release_ppbus(sc); 440 441 #ifdef DEVFS 442 sc->devfs_token = devfs_add_devswf(&lpt_cdevsw, 443 dev->id_unit, DV_CHR, 444 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", dev->id_unit); 445 sc->devfs_token_ctl = devfs_add_devswf(&lpt_cdevsw, 446 dev->id_unit | LP_BYPASS, DV_CHR, 447 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", dev->id_unit); 448 #endif 449 450 return (1); 451 } 452 453 static void 454 lptout(void *arg) 455 { 456 struct lpt_data *sc = arg; 457 int pl; 458 459 lprintf(("T %x ", ppb_rstr(&sc->lpt_dev))); 460 if (sc->sc_state & OPEN) { 461 sc->sc_backoff++; 462 if (sc->sc_backoff > hz/LPTOUTMAX) 463 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 464 timeout(lptout, (caddr_t)sc, sc->sc_backoff); 465 } else 466 sc->sc_state &= ~TOUT; 467 468 if (sc->sc_state & EERROR) 469 sc->sc_state &= ~EERROR; 470 471 /* 472 * Avoid possible hangs do to missed interrupts 473 */ 474 if (sc->sc_xfercnt) { 475 pl = spltty(); 476 lpt_intr(sc->lpt_unit); 477 splx(pl); 478 } else { 479 sc->sc_state &= ~OBUSY; 480 wakeup((caddr_t)sc); 481 } 482 } 483 484 /* 485 * lptopen -- reset the printer, then wait until it's selected and not busy. 486 * If LP_BYPASS flag is selected, then we do not try to select the 487 * printer -- this is just used for passing ioctls. 488 */ 489 490 static int 491 lptopen(dev_t dev, int flags, int fmt, struct proc *p) 492 { 493 struct lpt_data *sc; 494 495 int s; 496 int trys, err; 497 u_int unit = LPTUNIT(minor(dev)); 498 499 if ((unit >= nlpt)) 500 return (ENXIO); 501 502 sc = lptdata[unit]; 503 504 if (sc->sc_state) { 505 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 506 return(EBUSY); 507 } else 508 sc->sc_state |= LPTINIT; 509 510 sc->sc_flags = LPTFLAGS(minor(dev)); 511 512 /* Check for open with BYPASS flag set. */ 513 if (sc->sc_flags & LP_BYPASS) { 514 sc->sc_state = OPEN; 515 return(0); 516 } 517 518 /* request the ppbus only if we don't have it already */ 519 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0) 520 return (err); 521 522 s = spltty(); 523 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 524 525 /* set IRQ status according to ENABLE_IRQ flag */ 526 if (sc->sc_irq & LP_ENABLE_IRQ) 527 sc->sc_irq |= LP_USE_IRQ; 528 else 529 sc->sc_irq &= ~LP_USE_IRQ; 530 531 /* init printer */ 532 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 533 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 534 ppb_wctr(&sc->lpt_dev, 0); 535 sc->sc_primed++; 536 DELAY(500); 537 } 538 } 539 540 ppb_wctr(&sc->lpt_dev, LPC_SEL|LPC_NINIT); 541 542 /* wait till ready (printer running diagnostics) */ 543 trys = 0; 544 do { 545 /* ran out of waiting for the printer */ 546 if (trys++ >= LPINITRDY*4) { 547 splx(s); 548 sc->sc_state = 0; 549 lprintf(("status %x\n", ppb_rstr(&sc->lpt_dev))); 550 551 lpt_release_ppbus(sc); 552 return (EBUSY); 553 } 554 555 /* wait 1/4 second, give up if we get a signal */ 556 if (tsleep((caddr_t)sc, LPPRI|PCATCH, "lptinit", hz/4) != 557 EWOULDBLOCK) { 558 sc->sc_state = 0; 559 splx(s); 560 561 lpt_release_ppbus(sc); 562 return (EBUSY); 563 } 564 565 /* is printer online and ready for output */ 566 } while ((ppb_rstr(&sc->lpt_dev) & 567 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 568 (LPS_SEL|LPS_NBSY|LPS_NERR)); 569 570 sc->sc_control = LPC_SEL|LPC_NINIT; 571 if (sc->sc_flags & LP_AUTOLF) 572 sc->sc_control |= LPC_AUTOL; 573 574 /* enable interrupt if interrupt-driven */ 575 if (sc->sc_irq & LP_USE_IRQ) 576 sc->sc_control |= LPC_ENA; 577 578 ppb_wctr(&sc->lpt_dev, sc->sc_control); 579 580 sc->sc_state = OPEN; 581 sc->sc_inbuf = geteblk(BUFSIZE); 582 sc->sc_statbuf = geteblk(BUFSTATSIZE); 583 sc->sc_xfercnt = 0; 584 splx(s); 585 586 /* release the ppbus */ 587 lpt_release_ppbus(sc); 588 589 /* only use timeout if using interrupt */ 590 lprintf(("irq %x\n", sc->sc_irq)); 591 if (sc->sc_irq & LP_USE_IRQ) { 592 sc->sc_state |= TOUT; 593 timeout(lptout, (caddr_t)sc, 594 (sc->sc_backoff = hz/LPTOUTINITIAL)); 595 } 596 597 lprintf(("opened.\n")); 598 return(0); 599 } 600 601 /* 602 * lptclose -- close the device, free the local line buffer. 603 * 604 * Check for interrupted write call added. 605 */ 606 607 static int 608 lptclose(dev_t dev, int flags, int fmt, struct proc *p) 609 { 610 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))]; 611 int err; 612 613 if(sc->sc_flags & LP_BYPASS) 614 goto end_close; 615 616 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0) 617 return (err); 618 619 sc->sc_state &= ~OPEN; 620 621 /* if the last write was interrupted, don't complete it */ 622 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 623 while ((ppb_rstr(&sc->lpt_dev) & 624 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 625 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 626 /* wait 1/4 second, give up if we get a signal */ 627 if (tsleep((caddr_t)sc, LPPRI|PCATCH, 628 "lpclose", hz) != EWOULDBLOCK) 629 break; 630 631 ppb_wctr(&sc->lpt_dev, LPC_NINIT); 632 brelse(sc->sc_inbuf); 633 brelse(sc->sc_statbuf); 634 635 end_close: 636 /* release the bus anyway */ 637 lpt_release_ppbus(sc); 638 639 sc->sc_state = 0; 640 sc->sc_xfercnt = 0; 641 lprintf(("closed.\n")); 642 return(0); 643 } 644 645 /* 646 * lpt_pushbytes() 647 * Workhorse for actually spinning and writing bytes to printer 648 * Derived from lpa.c 649 * Originally by ? 650 * 651 * This code is only used when we are polling the port 652 */ 653 static int 654 lpt_pushbytes(struct lpt_data *sc) 655 { 656 int spin, err, tic; 657 char ch; 658 659 lprintf(("p")); 660 /* loop for every character .. */ 661 while (sc->sc_xfercnt > 0) { 662 /* printer data */ 663 ch = *(sc->sc_cp); 664 sc->sc_cp++; 665 sc->sc_xfercnt--; 666 667 /* 668 * Wait for printer ready. 669 * Loop 20 usecs testing BUSY bit, then sleep 670 * for exponentially increasing timeout. (vak) 671 */ 672 for (spin = 0; NOT_READY(sc) && spin < MAX_SPIN; ++spin) 673 DELAY(1); /* XXX delay is NOT this accurate! */ 674 if (spin >= MAX_SPIN) { 675 tic = 0; 676 while (NOT_READY(sc)) { 677 /* 678 * Now sleep, every cycle a 679 * little longer .. 680 */ 681 tic = tic + tic + 1; 682 /* 683 * But no more than 10 seconds. (vak) 684 */ 685 if (tic > MAX_SLEEP) 686 tic = MAX_SLEEP; 687 err = tsleep((caddr_t)sc, LPPRI, 688 LPT_NAME "poll", tic); 689 if (err != EWOULDBLOCK) { 690 return (err); 691 } 692 } 693 } 694 695 /* output data */ 696 ppb_wdtr(&sc->lpt_dev, ch); 697 /* strobe */ 698 ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB); 699 ppb_wctr(&sc->lpt_dev, sc->sc_control); 700 701 } 702 return(0); 703 } 704 705 /* 706 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 707 */ 708 709 static int 710 lptread(dev_t dev, struct uio *uio, int ioflag) 711 { 712 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))]; 713 int error = 0, len; 714 715 if ((error = ppb_1284_negociate(&sc->lpt_dev, PPB_NIBBLE, 0))) 716 return (error); 717 718 /* read data in an other buffer, read/write may be simultaneous */ 719 len = 0; 720 while (uio->uio_resid) { 721 if ((error = ppb_1284_read(&sc->lpt_dev, PPB_NIBBLE, 722 sc->sc_statbuf->b_data, min(BUFSTATSIZE, 723 uio->uio_resid), &len))) { 724 goto error; 725 } 726 727 if (!len) 728 goto error; /* no more data */ 729 730 if ((error = uiomove(sc->sc_statbuf->b_data, len, uio))) 731 goto error; 732 } 733 734 error: 735 ppb_1284_terminate(&sc->lpt_dev); 736 return (error); 737 } 738 739 /* 740 * lptwrite --copy a line from user space to a local buffer, then call 741 * putc to get the chars moved to the output queue. 742 * 743 * Flagging of interrupted write added. 744 */ 745 746 static int 747 lptwrite(dev_t dev, struct uio *uio, int ioflag) 748 { 749 register unsigned n; 750 int pl, err; 751 u_int unit = LPTUNIT(minor(dev)); 752 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))]; 753 754 if(sc->sc_flags & LP_BYPASS) { 755 /* we can't do writes in bypass mode */ 756 return(EPERM); 757 } 758 759 /* request the ppbus only if we don't have it already */ 760 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0) 761 return (err); 762 763 sc->sc_state &= ~INTERRUPTED; 764 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 765 sc->sc_cp = sc->sc_inbuf->b_data ; 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(&sc->lpt_dev, 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 pl = spltty(); 796 lpt_intr(sc->lpt_unit); 797 (void) splx(pl); 798 } 799 lprintf(("W ")); 800 if (sc->sc_state & OBUSY) 801 if ((err = tsleep((caddr_t)sc, 802 LPPRI|PCATCH, LPT_NAME "write", 0))) { 803 sc->sc_state |= INTERRUPTED; 804 return(err); 805 } 806 } 807 808 /* check to see if we must do a polled write */ 809 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 810 lprintf(("p")); 811 812 err = lpt_pushbytes(sc); 813 814 if (err) 815 return(err); 816 } 817 } 818 819 /* we have not been interrupted, release the ppbus */ 820 lpt_release_ppbus(sc); 821 822 return(0); 823 } 824 825 /* 826 * lpt_intr -- handle printer interrupts which occur when the printer is 827 * ready to accept another char. 828 * 829 * do checking for interrupted write call. 830 */ 831 832 static void 833 lpt_intr(int unit) 834 { 835 struct lpt_data *sc = lptdata[unit]; 836 int sts; 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(&sc->lpt_dev)) & 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(&sc->lpt_dev, *sc->sc_cp++) ; 860 ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB); 861 /* DELAY(X) */ 862 ppb_wctr(&sc->lpt_dev, 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 interrupted. 871 */ 872 sc->sc_state &= ~OBUSY; 873 874 if(!(sc->sc_state & INTERRUPTED)) 875 wakeup((caddr_t)sc); 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 } 886 887 static void 888 lptintr(int unit) 889 { 890 /* call the interrupt at required spl level */ 891 int s = spltty(); 892 893 lpt_intr(unit); 894 895 splx(s); 896 return; 897 } 898 899 static int 900 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 901 { 902 int error = 0; 903 struct lpt_data *sc; 904 u_int unit = LPTUNIT(minor(dev)); 905 u_char old_sc_irq; /* old printer IRQ status */ 906 907 sc = lptdata[unit]; 908 909 switch (cmd) { 910 case LPT_IRQ : 911 if(sc->sc_irq & LP_HAS_IRQ) { 912 /* 913 * NOTE: 914 * If the IRQ status is changed, 915 * this will only be visible on the 916 * next open. 917 * 918 * If interrupt status changes, 919 * this gets syslog'd. 920 */ 921 old_sc_irq = sc->sc_irq; 922 switch(*(int*)data) { 923 case 0: 924 sc->sc_irq &= (~LP_ENABLE_IRQ); 925 break; 926 case 1: 927 sc->sc_irq &= (~LP_ENABLE_EXT); 928 sc->sc_irq |= LP_ENABLE_IRQ; 929 break; 930 case 2: 931 /* classic irq based transfer and advanced 932 * modes are in conflict 933 */ 934 sc->sc_irq &= (~LP_ENABLE_IRQ); 935 sc->sc_irq |= LP_ENABLE_EXT; 936 break; 937 case 3: 938 sc->sc_irq &= (~LP_ENABLE_EXT); 939 break; 940 default: 941 break; 942 } 943 944 if (old_sc_irq != sc->sc_irq ) 945 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 946 unit, 947 (sc->sc_irq & LP_ENABLE_IRQ)? 948 "interrupt-driven":"polled", 949 (sc->sc_irq & LP_ENABLE_EXT)? 950 "extended":"standard"); 951 } else /* polled port */ 952 error = EOPNOTSUPP; 953 break; 954 default: 955 error = ENODEV; 956 } 957 958 return(error); 959 } 960