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: src/sys/dev/ppbus/lpt.c,v 1.15.2.3 2000/07/07 00:30:40 obrien Exp $ 52 * $DragonFly: src/sys/dev/misc/lpt/lpt.c,v 1.7 2003/08/07 21:16:56 dillon Exp $ 53 */ 54 55 /* 56 * Device Driver for AT parallel printer port 57 * Written by William Jolitz 12/18/90 58 */ 59 60 /* 61 * Updated for ppbus by Nicolas Souchu 62 * [Mon Jul 28 1997] 63 */ 64 65 #include "opt_lpt.h" 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/module.h> 70 #include <sys/bus.h> 71 #include <sys/conf.h> 72 #include <sys/kernel.h> 73 #include <sys/uio.h> 74 #include <sys/syslog.h> 75 #include <sys/malloc.h> 76 77 #include <machine/clock.h> 78 #include <machine/bus.h> 79 #include <machine/resource.h> 80 #include <sys/rman.h> 81 82 #include "lptio.h" 83 #include <bus/ppbus/ppbconf.h> 84 #include <bus/ppbus/ppb_1284.h> 85 #include "lpt.h" 86 #include "ppbus_if.h" 87 #include <bus/ppbus/ppbio.h> 88 89 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers"); 90 91 #ifndef LPT_DEBUG 92 #define lprintf(args) 93 #else 94 #define lprintf(args) \ 95 do { \ 96 if (lptflag) \ 97 printf args; \ 98 } while (0) 99 static int volatile lptflag = 1; 100 #endif 101 102 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 103 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 104 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 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 { 112 113 short sc_state; 114 /* default case: negative prime, negative ack, handshake strobe, 115 prime once */ 116 u_char sc_control; 117 char sc_flags; 118 #define LP_POS_INIT 0x04 /* if we are a postive init signal */ 119 #define LP_POS_ACK 0x08 /* if we are a positive going ack */ 120 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 121 #define LP_PRIMEOPEN 0x20 /* prime on every open */ 122 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 123 #define LP_BYPASS 0x80 /* bypass printer ready checks */ 124 void *sc_inbuf; 125 void *sc_statbuf; 126 short sc_xfercnt ; 127 char sc_primed; 128 char *sc_cp ; 129 u_short sc_irq ; /* IRQ status of port */ 130 #define LP_HAS_IRQ 0x01 /* we have an irq available */ 131 #define LP_USE_IRQ 0x02 /* we are using our irq */ 132 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 133 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 134 u_char sc_backoff ; /* time to call lptout() again */ 135 136 struct resource *intr_resource; /* interrupt resource */ 137 void *intr_cookie; /* interrupt registration cookie */ 138 139 }; 140 141 #define LPT_NAME "lpt" /* our official name */ 142 143 static timeout_t lptout; 144 static int lpt_port_test(device_t dev, u_char data, u_char mask); 145 static int lpt_detect(device_t dev); 146 147 #define DEVTOSOFTC(dev) \ 148 ((struct lpt_data *)device_get_softc(dev)) 149 #define UNITOSOFTC(unit) \ 150 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit))) 151 #define UNITODEVICE(unit) \ 152 (devclass_get_device(lpt_devclass, (unit))) 153 154 static void lptintr(device_t dev); 155 static void lpt_intr(void *arg); /* without spls */ 156 157 static devclass_t lpt_devclass; 158 159 160 /* bits for state */ 161 #define OPEN (1<<0) /* device is open */ 162 #define ASLP (1<<1) /* awaiting draining of printer */ 163 #define EERROR (1<<2) /* error was received from printer */ 164 #define OBUSY (1<<3) /* printer is busy doing output */ 165 #define LPTOUT (1<<4) /* timeout while not selected */ 166 #define TOUT (1<<5) /* timeout while not selected */ 167 #define LPTINIT (1<<6) /* waiting to initialize for open */ 168 #define INTERRUPTED (1<<7) /* write call was interrupted */ 169 170 #define HAVEBUS (1<<8) /* the driver owns the bus */ 171 172 173 /* status masks to interrogate printer status */ 174 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 175 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 176 177 /* Printer Ready condition - from lpa.c */ 178 /* Only used in polling code */ 179 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 180 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 181 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 182 183 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 184 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 185 186 187 static d_open_t lptopen; 188 static d_close_t lptclose; 189 static d_write_t lptwrite; 190 static d_read_t lptread; 191 static d_ioctl_t lptioctl; 192 193 #define CDEV_MAJOR 16 194 static struct cdevsw lpt_cdevsw = { 195 /* name */ LPT_NAME, 196 /* maj */ CDEV_MAJOR, 197 /* flags */ 0, 198 /* port */ NULL, 199 /* autoq */ 0, 200 201 /* open */ lptopen, 202 /* close */ lptclose, 203 /* read */ lptread, 204 /* write */ lptwrite, 205 /* ioctl */ lptioctl, 206 /* poll */ nopoll, 207 /* mmap */ nommap, 208 /* strategy */ nostrategy, 209 /* dump */ nodump, 210 /* psize */ nopsize 211 }; 212 213 static int 214 lpt_request_ppbus(device_t dev, int how) 215 { 216 device_t ppbus = device_get_parent(dev); 217 struct lpt_data *sc = DEVTOSOFTC(dev); 218 int error; 219 220 if (sc->sc_state & HAVEBUS) 221 return (0); 222 223 /* we have the bus only if the request succeded */ 224 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 225 sc->sc_state |= HAVEBUS; 226 227 return (error); 228 } 229 230 static int 231 lpt_release_ppbus(device_t dev) 232 { 233 device_t ppbus = device_get_parent(dev); 234 struct lpt_data *sc = DEVTOSOFTC(dev); 235 int error = 0; 236 237 if ((error = ppb_release_bus(ppbus, dev)) == 0) 238 sc->sc_state &= ~HAVEBUS; 239 240 return (error); 241 } 242 243 /* 244 * Internal routine to lptprobe to do port tests of one byte value 245 */ 246 static int 247 lpt_port_test(device_t ppbus, u_char data, u_char mask) 248 { 249 int temp, timeout; 250 251 data = data & mask; 252 ppb_wdtr(ppbus, data); 253 timeout = 10000; 254 do { 255 DELAY(10); 256 temp = ppb_rdtr(ppbus) & mask; 257 } 258 while (temp != data && --timeout); 259 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 260 return (temp == data); 261 } 262 263 /* 264 * Probe simplified by replacing multiple loops with a hardcoded 265 * test pattern - 1999/02/08 des@freebsd.org 266 * 267 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 268 * Based partially on Rod Grimes' printer probe 269 * 270 * Logic: 271 * 1) If no port address was given, use the bios detected ports 272 * and autodetect what ports the printers are on. 273 * 2) Otherwise, probe the data port at the address given, 274 * using the method in Rod Grimes' port probe. 275 * (Much code ripped off directly from Rod's probe.) 276 * 277 * Comments from Rod's probe: 278 * Logic: 279 * 1) You should be able to write to and read back the same value 280 * to the data port. Do an alternating zeros, alternating ones, 281 * walking zero, and walking one test to check for stuck bits. 282 * 283 * 2) You should be able to write to and read back the same value 284 * to the control port lower 5 bits, the upper 3 bits are reserved 285 * per the IBM PC technical reference manauls and different boards 286 * do different things with them. Do an alternating zeros, alternating 287 * ones, walking zero, and walking one test to check for stuck bits. 288 * 289 * Some printers drag the strobe line down when the are powered off 290 * so this bit has been masked out of the control port test. 291 * 292 * XXX Some printers may not like a fast pulse on init or strobe, I 293 * don't know at this point, if that becomes a problem these bits 294 * should be turned off in the mask byte for the control port test. 295 * 296 * We are finally left with a mask of 0x14, due to some printers 297 * being adamant about holding other bits high ........ 298 * 299 * Before probing the control port, we write a 0 to the data port - 300 * If not, some printers chuck out garbage when the strobe line 301 * gets toggled. 302 * 303 * 3) Set the data and control ports to a value of 0 304 * 305 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 306 * Epson FX-1170 and C.Itoh 8510RM 307 * printers. 308 * Quick exit on fail added. 309 */ 310 static int 311 lpt_detect(device_t dev) 312 { 313 device_t ppbus = device_get_parent(dev); 314 315 static u_char testbyte[18] = { 316 0x55, /* alternating zeros */ 317 0xaa, /* alternating ones */ 318 0xfe, 0xfd, 0xfb, 0xf7, 319 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 320 0x01, 0x02, 0x04, 0x08, 321 0x10, 0x20, 0x40, 0x80 /* walking one */ 322 }; 323 int i, error, status; 324 325 status = 1; /* assume success */ 326 327 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 328 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 329 status = 0; 330 goto end_probe; 331 } 332 333 for (i = 0; i < 18 && status; i++) 334 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 335 status = 0; 336 goto end_probe; 337 } 338 339 end_probe: 340 /* write 0's to control and data ports */ 341 ppb_wdtr(ppbus, 0); 342 ppb_wctr(ppbus, 0); 343 344 lpt_release_ppbus(dev); 345 346 return (status); 347 } 348 349 static void 350 lpt_identify(driver_t *driver, device_t parent) 351 { 352 353 BUS_ADD_CHILD(parent, 0, LPT_NAME, 0); 354 } 355 356 /* 357 * lpt_probe() 358 */ 359 static int 360 lpt_probe(device_t dev) 361 { 362 struct lpt_data *sc; 363 364 sc = DEVTOSOFTC(dev); 365 bzero(sc, sizeof(struct lpt_data)); 366 367 /* 368 * Now, try to detect the printer. 369 */ 370 if (!lpt_detect(dev)) 371 return (ENXIO); 372 373 device_set_desc(dev, "Printer"); 374 375 return (0); 376 } 377 378 static int 379 lpt_attach(device_t dev) 380 { 381 device_t ppbus = device_get_parent(dev); 382 struct lpt_data *sc = DEVTOSOFTC(dev); 383 int zero = 0, unit = device_get_unit(dev); 384 int error; 385 uintptr_t irq; 386 387 sc->sc_primed = 0; /* not primed yet */ 388 389 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 390 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 391 return (0); 392 } 393 394 ppb_wctr(ppbus, LPC_NINIT); 395 396 /* check if we can use interrupt, should be done by ppc stuff */ 397 lprintf(("oldirq %x\n", sc->sc_irq)); 398 399 /* retrieve the ppbus irq */ 400 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 401 402 if (irq > 0) { 403 /* declare our interrupt handler */ 404 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 405 &zero, irq, irq, 1, RF_SHAREABLE); 406 } 407 if (sc->intr_resource) { 408 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 409 device_printf(dev, "Interrupt-driven port\n"); 410 } else { 411 sc->sc_irq = 0; 412 device_printf(dev, "Polled port\n"); 413 } 414 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 415 416 lpt_release_ppbus(dev); 417 418 make_dev(&lpt_cdevsw, unit, 419 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 420 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 421 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 422 return (0); 423 } 424 425 static void 426 lptout(void *arg) 427 { 428 device_t dev = (device_t)arg; 429 struct lpt_data *sc = DEVTOSOFTC(dev); 430 #ifdef LPT_DEBUG 431 device_t ppbus = device_get_parent(dev); 432 #endif 433 434 lprintf(("T %x ", ppb_rstr(ppbus))); 435 if (sc->sc_state & OPEN) { 436 sc->sc_backoff++; 437 if (sc->sc_backoff > hz/LPTOUTMAX) 438 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 439 timeout(lptout, (caddr_t)dev, sc->sc_backoff); 440 } else 441 sc->sc_state &= ~TOUT; 442 443 if (sc->sc_state & EERROR) 444 sc->sc_state &= ~EERROR; 445 446 /* 447 * Avoid possible hangs due to missed interrupts 448 */ 449 if (sc->sc_xfercnt) { 450 lptintr(dev); 451 } else { 452 sc->sc_state &= ~OBUSY; 453 wakeup((caddr_t)dev); 454 } 455 } 456 457 /* 458 * lptopen -- reset the printer, then wait until it's selected and not busy. 459 * If LP_BYPASS flag is selected, then we do not try to select the 460 * printer -- this is just used for passing ioctls. 461 */ 462 463 static int 464 lptopen(dev_t dev, int flags, int fmt, struct thread *p) 465 { 466 int s; 467 int trys, err; 468 u_int unit = LPTUNIT(minor(dev)); 469 struct lpt_data *sc = UNITOSOFTC(unit); 470 device_t lptdev = UNITODEVICE(unit); 471 device_t ppbus = device_get_parent(lptdev); 472 473 if (!sc) 474 return (ENXIO); 475 476 if (sc->sc_state) { 477 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 478 return(EBUSY); 479 } else 480 sc->sc_state |= LPTINIT; 481 482 sc->sc_flags = LPTFLAGS(minor(dev)); 483 484 /* Check for open with BYPASS flag set. */ 485 if (sc->sc_flags & LP_BYPASS) { 486 sc->sc_state = OPEN; 487 return(0); 488 } 489 490 /* request the ppbus only if we don't have it already */ 491 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 492 /* give it a chance to try later */ 493 sc->sc_state = 0; 494 return (err); 495 } 496 497 s = spltty(); 498 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 499 500 /* set IRQ status according to ENABLE_IRQ flag 501 */ 502 if (sc->sc_irq & LP_ENABLE_IRQ) 503 sc->sc_irq |= LP_USE_IRQ; 504 else 505 sc->sc_irq &= ~LP_USE_IRQ; 506 507 /* init printer */ 508 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 509 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 510 ppb_wctr(ppbus, 0); 511 sc->sc_primed++; 512 DELAY(500); 513 } 514 } 515 516 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 517 518 /* wait till ready (printer running diagnostics) */ 519 trys = 0; 520 do { 521 /* ran out of waiting for the printer */ 522 if (trys++ >= LPINITRDY*4) { 523 splx(s); 524 sc->sc_state = 0; 525 lprintf(("status %x\n", ppb_rstr(ppbus))); 526 527 lpt_release_ppbus(lptdev); 528 return (EBUSY); 529 } 530 531 /* wait 1/4 second, give up if we get a signal */ 532 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) != 533 EWOULDBLOCK) { 534 sc->sc_state = 0; 535 splx(s); 536 537 lpt_release_ppbus(lptdev); 538 return (EBUSY); 539 } 540 541 /* is printer online and ready for output */ 542 } while ((ppb_rstr(ppbus) & 543 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 544 (LPS_SEL|LPS_NBSY|LPS_NERR)); 545 546 sc->sc_control = LPC_SEL|LPC_NINIT; 547 if (sc->sc_flags & LP_AUTOLF) 548 sc->sc_control |= LPC_AUTOL; 549 550 /* enable interrupt if interrupt-driven */ 551 if (sc->sc_irq & LP_USE_IRQ) 552 sc->sc_control |= LPC_ENA; 553 554 ppb_wctr(ppbus, sc->sc_control); 555 556 sc->sc_state = OPEN; 557 sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK); 558 sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK); 559 sc->sc_xfercnt = 0; 560 splx(s); 561 562 /* release the ppbus */ 563 lpt_release_ppbus(lptdev); 564 565 /* only use timeout if using interrupt */ 566 lprintf(("irq %x\n", sc->sc_irq)); 567 if (sc->sc_irq & LP_USE_IRQ) { 568 sc->sc_state |= TOUT; 569 timeout(lptout, (caddr_t)lptdev, 570 (sc->sc_backoff = hz/LPTOUTINITIAL)); 571 } 572 573 lprintf(("opened.\n")); 574 return(0); 575 } 576 577 /* 578 * lptclose -- close the device, free the local line buffer. 579 * 580 * Check for interrupted write call added. 581 */ 582 583 static int 584 lptclose(dev_t dev, int flags, int fmt, struct thread *p) 585 { 586 u_int unit = LPTUNIT(minor(dev)); 587 struct lpt_data *sc = UNITOSOFTC(unit); 588 device_t lptdev = UNITODEVICE(unit); 589 device_t ppbus = device_get_parent(lptdev); 590 int err; 591 592 if(sc->sc_flags & LP_BYPASS) 593 goto end_close; 594 595 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 596 return (err); 597 598 sc->sc_state &= ~OPEN; 599 600 /* if the last write was interrupted, don't complete it */ 601 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 602 while ((ppb_rstr(ppbus) & 603 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 604 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 605 /* wait 1/4 second, give up if we get a signal */ 606 if (tsleep((caddr_t)lptdev, PCATCH, 607 "lpclose", hz) != EWOULDBLOCK) 608 break; 609 610 ppb_wctr(ppbus, LPC_NINIT); 611 free(sc->sc_inbuf, M_LPT); 612 free(sc->sc_statbuf, M_LPT); 613 614 end_close: 615 /* release the bus anyway 616 * unregistration of interrupt forced by release 617 */ 618 lpt_release_ppbus(lptdev); 619 620 sc->sc_state = 0; 621 sc->sc_xfercnt = 0; 622 lprintf(("closed.\n")); 623 return(0); 624 } 625 626 /* 627 * lpt_pushbytes() 628 * Workhorse for actually spinning and writing bytes to printer 629 * Derived from lpa.c 630 * Originally by ? 631 * 632 * This code is only used when we are polling the port 633 */ 634 static int 635 lpt_pushbytes(device_t dev) 636 { 637 struct lpt_data *sc = DEVTOSOFTC(dev); 638 device_t ppbus = device_get_parent(dev); 639 int spin, err, tic; 640 char ch; 641 642 lprintf(("p")); 643 /* loop for every character .. */ 644 while (sc->sc_xfercnt > 0) { 645 /* printer data */ 646 ch = *(sc->sc_cp); 647 sc->sc_cp++; 648 sc->sc_xfercnt--; 649 650 /* 651 * Wait for printer ready. 652 * Loop 20 usecs testing BUSY bit, then sleep 653 * for exponentially increasing timeout. (vak) 654 */ 655 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 656 DELAY(1); /* XXX delay is NOT this accurate! */ 657 if (spin >= MAX_SPIN) { 658 tic = 0; 659 while (NOT_READY(ppbus)) { 660 /* 661 * Now sleep, every cycle a 662 * little longer .. 663 */ 664 tic = tic + tic + 1; 665 /* 666 * But no more than 10 seconds. (vak) 667 */ 668 if (tic > MAX_SLEEP) 669 tic = MAX_SLEEP; 670 err = tsleep((caddr_t)dev, 0, 671 LPT_NAME "poll", tic); 672 if (err != EWOULDBLOCK) { 673 return (err); 674 } 675 } 676 } 677 678 /* output data */ 679 ppb_wdtr(ppbus, ch); 680 /* strobe */ 681 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 682 ppb_wctr(ppbus, sc->sc_control); 683 684 } 685 return(0); 686 } 687 688 /* 689 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 690 */ 691 692 static int 693 lptread(dev_t dev, struct uio *uio, int ioflag) 694 { 695 u_int unit = LPTUNIT(minor(dev)); 696 struct lpt_data *sc = UNITOSOFTC(unit); 697 device_t lptdev = UNITODEVICE(unit); 698 device_t ppbus = device_get_parent(lptdev); 699 int error = 0, len; 700 701 if (sc->sc_flags & LP_BYPASS) { 702 /* we can't do reads in bypass mode */ 703 return (EPERM); 704 } 705 706 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 707 return (error); 708 709 /* read data in an other buffer, read/write may be simultaneous */ 710 len = 0; 711 while (uio->uio_resid) { 712 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 713 sc->sc_statbuf, min(BUFSTATSIZE, 714 uio->uio_resid), &len))) { 715 goto error; 716 } 717 718 if (!len) 719 goto error; /* no more data */ 720 721 if ((error = uiomove(sc->sc_statbuf, len, uio))) 722 goto error; 723 } 724 725 error: 726 ppb_1284_terminate(ppbus); 727 return (error); 728 } 729 730 /* 731 * lptwrite --copy a line from user space to a local buffer, then call 732 * putc to get the chars moved to the output queue. 733 * 734 * Flagging of interrupted write added. 735 */ 736 737 static int 738 lptwrite(dev_t dev, struct uio *uio, int ioflag) 739 { 740 unsigned n; 741 int err; 742 u_int unit = LPTUNIT(minor(dev)); 743 struct lpt_data *sc = UNITOSOFTC(unit); 744 device_t lptdev = UNITODEVICE(unit); 745 device_t ppbus = device_get_parent(lptdev); 746 747 if(sc->sc_flags & LP_BYPASS) { 748 /* we can't do writes in bypass mode */ 749 return(EPERM); 750 } 751 752 /* request the ppbus only if we don't have it already */ 753 /* XXX interrupt registration?! */ 754 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 755 return (err); 756 757 /* if interrupts are working, register the handler */ 758 if (sc->sc_irq & LP_USE_IRQ) { 759 /* register our interrupt handler */ 760 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 761 INTR_TYPE_TTY, lpt_intr, lptdev, 762 &sc->intr_cookie); 763 if (err) { 764 device_printf(lptdev, "handler registration failed, polled mode.\n"); 765 sc->sc_irq &= ~LP_USE_IRQ; 766 } 767 } 768 769 sc->sc_state &= ~INTERRUPTED; 770 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 771 sc->sc_cp = sc->sc_inbuf; 772 uiomove(sc->sc_cp, n, uio); 773 sc->sc_xfercnt = n ; 774 775 if (sc->sc_irq & LP_ENABLE_EXT) { 776 /* try any extended mode */ 777 err = ppb_write(ppbus, sc->sc_cp, 778 sc->sc_xfercnt, 0); 779 switch (err) { 780 case 0: 781 /* if not all data was sent, we could rely 782 * on polling for the last bytes */ 783 sc->sc_xfercnt = 0; 784 break; 785 case EINTR: 786 sc->sc_state |= INTERRUPTED; 787 return(err); 788 case EINVAL: 789 /* advanced mode not avail */ 790 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 791 break; 792 default: 793 return(err); 794 } 795 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 796 lprintf(("i")); 797 /* if the printer is ready for a char, */ 798 /* give it one */ 799 if ((sc->sc_state & OBUSY) == 0){ 800 lprintf(("\nC %d. ", sc->sc_xfercnt)); 801 lptintr(lptdev); 802 } 803 lprintf(("W ")); 804 if (sc->sc_state & OBUSY) 805 if ((err = tsleep((caddr_t)lptdev, 806 PCATCH, LPT_NAME "write", 0))) { 807 sc->sc_state |= INTERRUPTED; 808 return(err); 809 } 810 } 811 812 /* check to see if we must do a polled write */ 813 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 814 lprintf(("p")); 815 816 err = lpt_pushbytes(lptdev); 817 818 if (err) 819 return(err); 820 } 821 } 822 823 /* we have not been interrupted, release the ppbus */ 824 lpt_release_ppbus(lptdev); 825 826 return(0); 827 } 828 829 /* 830 * lpt_intr -- handle printer interrupts which occur when the printer is 831 * ready to accept another char. 832 * 833 * do checking for interrupted write call. 834 */ 835 836 static void 837 lpt_intr(void *arg) 838 { 839 device_t lptdev = (device_t)arg; 840 device_t ppbus = device_get_parent(lptdev); 841 struct lpt_data *sc = DEVTOSOFTC(lptdev); 842 int sts = 0; 843 int i; 844 845 /* we must own the bus to use it */ 846 if ((sc->sc_state & HAVEBUS) == 0) 847 return; 848 849 /* 850 * Is printer online and ready for output? 851 * 852 * Avoid falling back to lptout() too quickly. First spin-loop 853 * to see if the printer will become ready ``really soon now''. 854 */ 855 for (i = 0; i < 100 && 856 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 857 858 if ((sts & RDY_MASK) == LP_READY) { 859 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 860 sc->sc_backoff = hz/LPTOUTINITIAL; 861 862 if (sc->sc_xfercnt) { 863 /* send char */ 864 /*lprintf(("%x ", *sc->sc_cp)); */ 865 ppb_wdtr(ppbus, *sc->sc_cp++) ; 866 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 867 /* DELAY(X) */ 868 ppb_wctr(ppbus, sc->sc_control); 869 870 /* any more data for printer */ 871 if(--(sc->sc_xfercnt) > 0) return; 872 } 873 874 /* 875 * No more data waiting for printer. 876 * Wakeup is not done if write call was not interrupted. 877 */ 878 sc->sc_state &= ~OBUSY; 879 880 if(!(sc->sc_state & INTERRUPTED)) 881 wakeup((caddr_t)lptdev); 882 lprintf(("w ")); 883 return; 884 } else { /* check for error */ 885 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 886 (sc->sc_state & OPEN)) 887 sc->sc_state |= EERROR; 888 /* lptout() will jump in and try to restart. */ 889 } 890 lprintf(("sts %x ", sts)); 891 } 892 893 static void 894 lptintr(device_t dev) 895 { 896 /* call the interrupt at required spl level */ 897 int s = spltty(); 898 899 lpt_intr(dev); 900 901 splx(s); 902 return; 903 } 904 905 static int 906 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *p) 907 { 908 int error = 0; 909 u_int unit = LPTUNIT(minor(dev)); 910 struct lpt_data *sc = UNITOSOFTC(unit); 911 u_char old_sc_irq; /* old printer IRQ status */ 912 913 switch (cmd) { 914 case LPT_IRQ : 915 if(sc->sc_irq & LP_HAS_IRQ) { 916 /* 917 * NOTE: 918 * If the IRQ status is changed, 919 * this will only be visible on the 920 * next open. 921 * 922 * If interrupt status changes, 923 * this gets syslog'd. 924 */ 925 old_sc_irq = sc->sc_irq; 926 switch(*(int*)data) { 927 case 0: 928 sc->sc_irq &= (~LP_ENABLE_IRQ); 929 break; 930 case 1: 931 sc->sc_irq &= (~LP_ENABLE_EXT); 932 sc->sc_irq |= LP_ENABLE_IRQ; 933 break; 934 case 2: 935 /* classic irq based transfer and advanced 936 * modes are in conflict 937 */ 938 sc->sc_irq &= (~LP_ENABLE_IRQ); 939 sc->sc_irq |= LP_ENABLE_EXT; 940 break; 941 case 3: 942 sc->sc_irq &= (~LP_ENABLE_EXT); 943 break; 944 default: 945 break; 946 } 947 948 if (old_sc_irq != sc->sc_irq ) 949 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 950 unit, 951 (sc->sc_irq & LP_ENABLE_IRQ)? 952 "interrupt-driven":"polled", 953 (sc->sc_irq & LP_ENABLE_EXT)? 954 "extended":"standard"); 955 } else /* polled port */ 956 error = EOPNOTSUPP; 957 break; 958 default: 959 error = ENODEV; 960 } 961 962 return(error); 963 } 964 965 static device_method_t lpt_methods[] = { 966 /* device interface */ 967 DEVMETHOD(device_identify, lpt_identify), 968 DEVMETHOD(device_probe, lpt_probe), 969 DEVMETHOD(device_attach, lpt_attach), 970 971 { 0, 0 } 972 }; 973 974 static driver_t lpt_driver = { 975 LPT_NAME, 976 lpt_methods, 977 sizeof(struct lpt_data), 978 }; 979 980 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 981