Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/ppbus/lpt.c
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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 #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 static void lpt_drvinit(void *unused); 163 164 static void lpt_intr(int unit); /* without spls */ 165 166 #ifdef KERNEL 167 168 static struct ppb_driver lptdriver = { 169 lptprobe, lptattach, LPT_NAME 170 }; 171 DATA_SET(ppbdriver_set, lptdriver); 172 173 #endif /* KERNEL */ 174 175 /* bits for state */ 176 #define OPEN (1<<0) /* device is open */ 177 #define ASLP (1<<1) /* awaiting draining of printer */ 178 #define EERROR (1<<2) /* error was received from printer */ 179 #define OBUSY (1<<3) /* printer is busy doing output */ 180 #define LPTOUT (1<<4) /* timeout while not selected */ 181 #define TOUT (1<<5) /* timeout while not selected */ 182 #define LPTINIT (1<<6) /* waiting to initialize for open */ 183 #define INTERRUPTED (1<<7) /* write call was interrupted */ 184 185 #define HAVEBUS (1<<8) /* the driver owns the bus */ 186 187 188 /* status masks to interrogate printer status */ 189 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 190 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 191 192 /* Printer Ready condition - from lpa.c */ 193 /* Only used in polling code */ 194 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 195 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 196 #define NOT_READY(lpt) ((ppb_rstr(&(lpt)->lpt_dev)^LPS_INVERT)&LPS_MASK) 197 198 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 199 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 200 201 202 static d_open_t lptopen; 203 static d_close_t lptclose; 204 static d_write_t lptwrite; 205 static d_read_t lptread; 206 static d_ioctl_t lptioctl; 207 208 #define CDEV_MAJOR 16 209 static struct cdevsw lpt_cdevsw = 210 { lptopen, lptclose, lptread, lptwrite, /*16*/ 211 lptioctl, nullstop, nullreset, nodevtotty, /* lpt */ 212 seltrue, nommap, nostrat, LPT_NAME, NULL, -1 }; 213 214 static int 215 lpt_request_ppbus(struct lpt_data *sc, int how) 216 { 217 int error; 218 219 if (sc->sc_state & HAVEBUS) 220 return (0); 221 222 /* we have the bus only if the request succeded */ 223 if ((error = ppb_request_bus(&sc->lpt_dev, how)) == 0) 224 sc->sc_state |= HAVEBUS; 225 226 return (error); 227 } 228 229 static int 230 lpt_release_ppbus(struct lpt_data *sc) 231 { 232 ppb_release_bus(&sc->lpt_dev); 233 sc->sc_state &= ~HAVEBUS; 234 235 return (0); 236 } 237 238 /* 239 * Internal routine to lptprobe to do port tests of one byte value 240 */ 241 static int 242 lpt_port_test(struct lpt_data *sc, u_char data, u_char mask) 243 { 244 int temp, timeout; 245 246 data = data & mask; 247 ppb_wdtr(&sc->lpt_dev, data); 248 timeout = 10000; 249 do { 250 DELAY(10); 251 temp = ppb_rdtr(&sc->lpt_dev) & mask; 252 } 253 while (temp != data && --timeout); 254 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 255 return (temp == data); 256 } 257 258 /* 259 * Probe simplified by replacing multiple loops with a hardcoded 260 * test pattern - 1999/02/08 des@freebsd.org 261 * 262 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 263 * Based partially on Rod Grimes' printer probe 264 * 265 * Logic: 266 * 1) If no port address was given, use the bios detected ports 267 * and autodetect what ports the printers are on. 268 * 2) Otherwise, probe the data port at the address given, 269 * using the method in Rod Grimes' port probe. 270 * (Much code ripped off directly from Rod's probe.) 271 * 272 * Comments from Rod's probe: 273 * Logic: 274 * 1) You should be able to write to and read back the same value 275 * to the data port. Do an alternating zeros, alternating ones, 276 * walking zero, and walking one test to check for stuck bits. 277 * 278 * 2) You should be able to write to and read back the same value 279 * to the control port lower 5 bits, the upper 3 bits are reserved 280 * per the IBM PC technical reference manauls and different boards 281 * do different things with them. Do an alternating zeros, alternating 282 * ones, walking zero, and walking one test to check for stuck bits. 283 * 284 * Some printers drag the strobe line down when the are powered off 285 * so this bit has been masked out of the control port test. 286 * 287 * XXX Some printers may not like a fast pulse on init or strobe, I 288 * don't know at this point, if that becomes a problem these bits 289 * should be turned off in the mask byte for the control port test. 290 * 291 * We are finally left with a mask of 0x14, due to some printers 292 * being adamant about holding other bits high ........ 293 * 294 * Before probing the control port, we write a 0 to the data port - 295 * If not, some printers chuck out garbage when the strobe line 296 * gets toggled. 297 * 298 * 3) Set the data and control ports to a value of 0 299 * 300 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 301 * Epson FX-1170 and C.Itoh 8510RM 302 * printers. 303 * Quick exit on fail added. 304 */ 305 static int 306 lpt_detect(struct lpt_data *sc) 307 { 308 static u_char testbyte[18] = { 309 0x55, /* alternating zeros */ 310 0xaa, /* alternating ones */ 311 0xfe, 0xfd, 0xfb, 0xf7, 312 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 313 0x01, 0x02, 0x04, 0x08, 314 0x10, 0x20, 0x40, 0x80 /* walking one */ 315 }; 316 int i, error, status; 317 318 status = 1; /* assume success */ 319 320 if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) { 321 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 322 status = 0; 323 goto end_probe; 324 } 325 326 for (i = 0; i < 18 && status; i++) 327 if (!lpt_port_test(sc, testbyte[i], 0xff)) { 328 status = 0; 329 goto end_probe; 330 } 331 332 end_probe: 333 /* write 0's to control and data ports */ 334 ppb_wdtr(&sc->lpt_dev, 0); 335 ppb_wctr(&sc->lpt_dev, 0); 336 337 lpt_release_ppbus(sc); 338 339 return (status); 340 } 341 342 /* 343 * lptprobe() 344 */ 345 static struct ppb_device * 346 lptprobe(struct ppb_data *ppb) 347 { 348 struct lpt_data *sc; 349 350 sc = (struct lpt_data *) malloc(sizeof(struct lpt_data), 351 M_TEMP, M_NOWAIT); 352 if (!sc) { 353 printf(LPT_NAME ": cannot malloc!\n"); 354 return (0); 355 } 356 bzero(sc, sizeof(struct lpt_data)); 357 358 lptdata[nlpt] = sc; 359 360 /* 361 * lpt dependent initialisation. 362 */ 363 sc->lpt_unit = nlpt; 364 365 /* 366 * ppbus dependent initialisation. 367 */ 368 sc->lpt_dev.id_unit = sc->lpt_unit; 369 sc->lpt_dev.name = lptdriver.name; 370 sc->lpt_dev.ppb = ppb; 371 sc->lpt_dev.intr = lptintr; 372 373 /* 374 * Now, try to detect the printer. 375 */ 376 if (!lpt_detect(sc)) { 377 free(sc, M_TEMP); 378 return (0); 379 } 380 381 /* Ok, go to next device on next probe */ 382 nlpt ++; 383 384 return (&sc->lpt_dev); 385 } 386 387 static int 388 lptattach(struct ppb_device *dev) 389 { 390 struct lpt_data *sc = lptdata[dev->id_unit]; 391 int error; 392 393 /* 394 * Report ourselves 395 */ 396 printf(LPT_NAME "%d: <generic printer> on ppbus %d\n", 397 dev->id_unit, dev->ppb->ppb_link->adapter_unit); 398 399 sc->sc_primed = 0; /* not primed yet */ 400 401 if ((error = lpt_request_ppbus(sc, PPB_DONTWAIT))) { 402 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 403 return (0); 404 } 405 406 ppb_wctr(&sc->lpt_dev, LPC_NINIT); 407 408 /* check if we can use interrupt, should be done by ppc stuff */ 409 lprintf(("oldirq %x\n", sc->sc_irq)); 410 if (ppb_get_irq(&sc->lpt_dev)) { 411 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 412 printf(LPT_NAME "%d: Interrupt-driven port\n", dev->id_unit); 413 } else { 414 sc->sc_irq = 0; 415 lprintf((LPT_NAME "%d: Polled port\n", dev->id_unit)); 416 } 417 lprintf(("irq %x\n", sc->sc_irq)); 418 419 lpt_release_ppbus(sc); 420 421 #ifdef DEVFS 422 sc->devfs_token = devfs_add_devswf(&lpt_cdevsw, 423 dev->id_unit, DV_CHR, 424 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", dev->id_unit); 425 sc->devfs_token_ctl = devfs_add_devswf(&lpt_cdevsw, 426 dev->id_unit | LP_BYPASS, DV_CHR, 427 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", dev->id_unit); 428 #endif 429 430 return (1); 431 } 432 433 static void 434 lptout(void *arg) 435 { 436 struct lpt_data *sc = arg; 437 int pl; 438 439 lprintf(("T %x ", ppb_rstr(&sc->lpt_dev))); 440 if (sc->sc_state & OPEN) { 441 sc->sc_backoff++; 442 if (sc->sc_backoff > hz/LPTOUTMAX) 443 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 444 timeout(lptout, (caddr_t)sc, sc->sc_backoff); 445 } else 446 sc->sc_state &= ~TOUT; 447 448 if (sc->sc_state & EERROR) 449 sc->sc_state &= ~EERROR; 450 451 /* 452 * Avoid possible hangs do to missed interrupts 453 */ 454 if (sc->sc_xfercnt) { 455 pl = spltty(); 456 lpt_intr(sc->lpt_unit); 457 splx(pl); 458 } else { 459 sc->sc_state &= ~OBUSY; 460 wakeup((caddr_t)sc); 461 } 462 } 463 464 /* 465 * lptopen -- reset the printer, then wait until it's selected and not busy. 466 * If LP_BYPASS flag is selected, then we do not try to select the 467 * printer -- this is just used for passing ioctls. 468 */ 469 470 static int 471 lptopen(dev_t dev, int flags, int fmt, struct proc *p) 472 { 473 struct lpt_data *sc; 474 475 int s; 476 int trys, err; 477 u_int unit = LPTUNIT(minor(dev)); 478 479 if ((unit >= nlpt)) 480 return (ENXIO); 481 482 sc = lptdata[unit]; 483 484 if (sc->sc_state) { 485 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 486 return(EBUSY); 487 } else 488 sc->sc_state |= LPTINIT; 489 490 sc->sc_flags = LPTFLAGS(minor(dev)); 491 492 /* Check for open with BYPASS flag set. */ 493 if (sc->sc_flags & LP_BYPASS) { 494 sc->sc_state = OPEN; 495 return(0); 496 } 497 498 /* request the ppbus only if we don't have it already */ 499 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0) 500 return (err); 501 502 s = spltty(); 503 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 504 505 /* set IRQ status according to ENABLE_IRQ flag */ 506 if (sc->sc_irq & LP_ENABLE_IRQ) 507 sc->sc_irq |= LP_USE_IRQ; 508 else 509 sc->sc_irq &= ~LP_USE_IRQ; 510 511 /* init printer */ 512 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 513 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 514 ppb_wctr(&sc->lpt_dev, 0); 515 sc->sc_primed++; 516 DELAY(500); 517 } 518 } 519 520 ppb_wctr(&sc->lpt_dev, LPC_SEL|LPC_NINIT); 521 522 /* wait till ready (printer running diagnostics) */ 523 trys = 0; 524 do { 525 /* ran out of waiting for the printer */ 526 if (trys++ >= LPINITRDY*4) { 527 splx(s); 528 sc->sc_state = 0; 529 lprintf(("status %x\n", ppb_rstr(&sc->lpt_dev))); 530 531 lpt_release_ppbus(sc); 532 return (EBUSY); 533 } 534 535 /* wait 1/4 second, give up if we get a signal */ 536 if (tsleep((caddr_t)sc, LPPRI|PCATCH, "lptinit", hz/4) != 537 EWOULDBLOCK) { 538 sc->sc_state = 0; 539 splx(s); 540 541 lpt_release_ppbus(sc); 542 return (EBUSY); 543 } 544 545 /* is printer online and ready for output */ 546 } while ((ppb_rstr(&sc->lpt_dev) & 547 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 548 (LPS_SEL|LPS_NBSY|LPS_NERR)); 549 550 sc->sc_control = LPC_SEL|LPC_NINIT; 551 if (sc->sc_flags & LP_AUTOLF) 552 sc->sc_control |= LPC_AUTOL; 553 554 /* enable interrupt if interrupt-driven */ 555 if (sc->sc_irq & LP_USE_IRQ) 556 sc->sc_control |= LPC_ENA; 557 558 ppb_wctr(&sc->lpt_dev, sc->sc_control); 559 560 sc->sc_state = OPEN; 561 sc->sc_inbuf = geteblk(BUFSIZE); 562 sc->sc_statbuf = geteblk(BUFSTATSIZE); 563 sc->sc_xfercnt = 0; 564 splx(s); 565 566 /* release the ppbus */ 567 lpt_release_ppbus(sc); 568 569 /* only use timeout if using interrupt */ 570 lprintf(("irq %x\n", sc->sc_irq)); 571 if (sc->sc_irq & LP_USE_IRQ) { 572 sc->sc_state |= TOUT; 573 timeout(lptout, (caddr_t)sc, 574 (sc->sc_backoff = hz/LPTOUTINITIAL)); 575 } 576 577 lprintf(("opened.\n")); 578 return(0); 579 } 580 581 /* 582 * lptclose -- close the device, free the local line buffer. 583 * 584 * Check for interrupted write call added. 585 */ 586 587 static int 588 lptclose(dev_t dev, int flags, int fmt, struct proc *p) 589 { 590 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))]; 591 int err; 592 593 if(sc->sc_flags & LP_BYPASS) 594 goto end_close; 595 596 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0) 597 return (err); 598 599 sc->sc_state &= ~OPEN; 600 601 /* if the last write was interrupted, don't complete it */ 602 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 603 while ((ppb_rstr(&sc->lpt_dev) & 604 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 605 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 606 /* wait 1/4 second, give up if we get a signal */ 607 if (tsleep((caddr_t)sc, LPPRI|PCATCH, 608 "lpclose", hz) != EWOULDBLOCK) 609 break; 610 611 ppb_wctr(&sc->lpt_dev, LPC_NINIT); 612 brelse(sc->sc_inbuf); 613 brelse(sc->sc_statbuf); 614 615 end_close: 616 /* release the bus anyway */ 617 lpt_release_ppbus(sc); 618 619 sc->sc_state = 0; 620 sc->sc_xfercnt = 0; 621 lprintf(("closed.\n")); 622 return(0); 623 } 624 625 /* 626 * lpt_pushbytes() 627 * Workhorse for actually spinning and writing bytes to printer 628 * Derived from lpa.c 629 * Originally by ? 630 * 631 * This code is only used when we are polling the port 632 */ 633 static int 634 lpt_pushbytes(struct lpt_data *sc) 635 { 636 int spin, err, tic; 637 char ch; 638 639 lprintf(("p")); 640 /* loop for every character .. */ 641 while (sc->sc_xfercnt > 0) { 642 /* printer data */ 643 ch = *(sc->sc_cp); 644 sc->sc_cp++; 645 sc->sc_xfercnt--; 646 647 /* 648 * Wait for printer ready. 649 * Loop 20 usecs testing BUSY bit, then sleep 650 * for exponentially increasing timeout. (vak) 651 */ 652 for (spin = 0; NOT_READY(sc) && spin < MAX_SPIN; ++spin) 653 DELAY(1); /* XXX delay is NOT this accurate! */ 654 if (spin >= MAX_SPIN) { 655 tic = 0; 656 while (NOT_READY(sc)) { 657 /* 658 * Now sleep, every cycle a 659 * little longer .. 660 */ 661 tic = tic + tic + 1; 662 /* 663 * But no more than 10 seconds. (vak) 664 */ 665 if (tic > MAX_SLEEP) 666 tic = MAX_SLEEP; 667 err = tsleep((caddr_t)sc, LPPRI, 668 LPT_NAME "poll", tic); 669 if (err != EWOULDBLOCK) { 670 return (err); 671 } 672 } 673 } 674 675 /* output data */ 676 ppb_wdtr(&sc->lpt_dev, ch); 677 /* strobe */ 678 ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB); 679 ppb_wctr(&sc->lpt_dev, sc->sc_control); 680 681 } 682 return(0); 683 } 684 685 /* 686 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 687 */ 688 689 static int 690 lptread(dev_t dev, struct uio *uio, int ioflag) 691 { 692 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))]; 693 int error = 0, len; 694 695 if (sc->sc_flags & LP_BYPASS) { 696 /* we can't do reads in bypass mode */ 697 return (EPERM); 698 } 699 700 if ((error = ppb_1284_negociate(&sc->lpt_dev, PPB_NIBBLE, 0))) 701 return (error); 702 703 /* read data in an other buffer, read/write may be simultaneous */ 704 len = 0; 705 while (uio->uio_resid) { 706 if ((error = ppb_1284_read(&sc->lpt_dev, PPB_NIBBLE, 707 sc->sc_statbuf->b_data, min(BUFSTATSIZE, 708 uio->uio_resid), &len))) { 709 goto error; 710 } 711 712 if (!len) 713 goto error; /* no more data */ 714 715 if ((error = uiomove(sc->sc_statbuf->b_data, len, uio))) 716 goto error; 717 } 718 719 error: 720 ppb_1284_terminate(&sc->lpt_dev); 721 return (error); 722 } 723 724 /* 725 * lptwrite --copy a line from user space to a local buffer, then call 726 * putc to get the chars moved to the output queue. 727 * 728 * Flagging of interrupted write added. 729 */ 730 731 static int 732 lptwrite(dev_t dev, struct uio *uio, int ioflag) 733 { 734 register unsigned n; 735 int pl, err; 736 u_int unit = LPTUNIT(minor(dev)); 737 struct lpt_data *sc = lptdata[LPTUNIT(minor(dev))]; 738 739 if(sc->sc_flags & LP_BYPASS) { 740 /* we can't do writes in bypass mode */ 741 return(EPERM); 742 } 743 744 /* request the ppbus only if we don't have it already */ 745 if ((err = lpt_request_ppbus(sc, PPB_WAIT|PPB_INTR)) != 0) 746 return (err); 747 748 sc->sc_state &= ~INTERRUPTED; 749 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 750 sc->sc_cp = sc->sc_inbuf->b_data ; 751 uiomove(sc->sc_cp, n, uio); 752 sc->sc_xfercnt = n ; 753 754 if (sc->sc_irq & LP_ENABLE_EXT) { 755 /* try any extended mode */ 756 err = ppb_write(&sc->lpt_dev, sc->sc_cp, 757 sc->sc_xfercnt, 0); 758 switch (err) { 759 case 0: 760 /* if not all data was sent, we could rely 761 * on polling for the last bytes */ 762 sc->sc_xfercnt = 0; 763 break; 764 case EINTR: 765 sc->sc_state |= INTERRUPTED; 766 return(err); 767 case EINVAL: 768 /* advanced mode not avail */ 769 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 770 break; 771 default: 772 return(err); 773 } 774 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 775 lprintf(("i")); 776 /* if the printer is ready for a char, */ 777 /* give it one */ 778 if ((sc->sc_state & OBUSY) == 0){ 779 lprintf(("\nC %d. ", sc->sc_xfercnt)); 780 pl = spltty(); 781 lpt_intr(sc->lpt_unit); 782 (void) splx(pl); 783 } 784 lprintf(("W ")); 785 if (sc->sc_state & OBUSY) 786 if ((err = tsleep((caddr_t)sc, 787 LPPRI|PCATCH, LPT_NAME "write", 0))) { 788 sc->sc_state |= INTERRUPTED; 789 return(err); 790 } 791 } 792 793 /* check to see if we must do a polled write */ 794 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 795 lprintf(("p")); 796 797 err = lpt_pushbytes(sc); 798 799 if (err) 800 return(err); 801 } 802 } 803 804 /* we have not been interrupted, release the ppbus */ 805 lpt_release_ppbus(sc); 806 807 return(0); 808 } 809 810 /* 811 * lpt_intr -- handle printer interrupts which occur when the printer is 812 * ready to accept another char. 813 * 814 * do checking for interrupted write call. 815 */ 816 817 static void 818 lpt_intr(int unit) 819 { 820 struct lpt_data *sc = lptdata[unit]; 821 int sts; 822 int i; 823 824 /* we must own the bus to use it */ 825 if ((sc->sc_state & HAVEBUS) == 0) 826 return; 827 828 /* 829 * Is printer online and ready for output? 830 * 831 * Avoid falling back to lptout() too quickly. First spin-loop 832 * to see if the printer will become ready ``really soon now''. 833 */ 834 for (i = 0; i < 100 && 835 ((sts=ppb_rstr(&sc->lpt_dev)) & RDY_MASK) != LP_READY; i++) ; 836 837 if ((sts & RDY_MASK) == LP_READY) { 838 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 839 sc->sc_backoff = hz/LPTOUTINITIAL; 840 841 if (sc->sc_xfercnt) { 842 /* send char */ 843 /*lprintf(("%x ", *sc->sc_cp)); */ 844 ppb_wdtr(&sc->lpt_dev, *sc->sc_cp++) ; 845 ppb_wctr(&sc->lpt_dev, sc->sc_control|LPC_STB); 846 /* DELAY(X) */ 847 ppb_wctr(&sc->lpt_dev, sc->sc_control); 848 849 /* any more data for printer */ 850 if(--(sc->sc_xfercnt) > 0) return; 851 } 852 853 /* 854 * No more data waiting for printer. 855 * Wakeup is not done if write call was interrupted. 856 */ 857 sc->sc_state &= ~OBUSY; 858 859 if(!(sc->sc_state & INTERRUPTED)) 860 wakeup((caddr_t)sc); 861 lprintf(("w ")); 862 return; 863 } else { /* check for error */ 864 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 865 (sc->sc_state & OPEN)) 866 sc->sc_state |= EERROR; 867 /* lptout() will jump in and try to restart. */ 868 } 869 lprintf(("sts %x ", sts)); 870 } 871 872 static void 873 lptintr(int unit) 874 { 875 /* call the interrupt at required spl level */ 876 int s = spltty(); 877 878 lpt_intr(unit); 879 880 splx(s); 881 return; 882 } 883 884 static int 885 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 886 { 887 int error = 0; 888 struct lpt_data *sc; 889 u_int unit = LPTUNIT(minor(dev)); 890 u_char old_sc_irq; /* old printer IRQ status */ 891 892 sc = lptdata[unit]; 893 894 switch (cmd) { 895 case LPT_IRQ : 896 if(sc->sc_irq & LP_HAS_IRQ) { 897 /* 898 * NOTE: 899 * If the IRQ status is changed, 900 * this will only be visible on the 901 * next open. 902 * 903 * If interrupt status changes, 904 * this gets syslog'd. 905 */ 906 old_sc_irq = sc->sc_irq; 907 switch(*(int*)data) { 908 case 0: 909 sc->sc_irq &= (~LP_ENABLE_IRQ); 910 break; 911 case 1: 912 sc->sc_irq &= (~LP_ENABLE_EXT); 913 sc->sc_irq |= LP_ENABLE_IRQ; 914 break; 915 case 2: 916 /* classic irq based transfer and advanced 917 * modes are in conflict 918 */ 919 sc->sc_irq &= (~LP_ENABLE_IRQ); 920 sc->sc_irq |= LP_ENABLE_EXT; 921 break; 922 case 3: 923 sc->sc_irq &= (~LP_ENABLE_EXT); 924 break; 925 default: 926 break; 927 } 928 929 if (old_sc_irq != sc->sc_irq ) 930 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 931 unit, 932 (sc->sc_irq & LP_ENABLE_IRQ)? 933 "interrupt-driven":"polled", 934 (sc->sc_irq & LP_ENABLE_EXT)? 935 "extended":"standard"); 936 } else /* polled port */ 937 error = EOPNOTSUPP; 938 break; 939 default: 940 error = ENODEV; 941 } 942 943 return(error); 944 } 945 946 static lpt_devsw_installed = 0; 947 948 static void 949 lpt_drvinit(void *unused) 950 { 951 dev_t dev; 952 953 if( ! lpt_devsw_installed ) { 954 dev = makedev(CDEV_MAJOR, 0); 955 cdevsw_add(&dev,&lpt_cdevsw, NULL); 956 lpt_devsw_installed = 1; 957 } 958 } 959 960 SYSINIT(lptdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,lpt_drvinit,NULL)
Cache object: 4f2167b6adc2141c9d94725c57e2d87b
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