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 1.14 2005/10/28 03:25:46 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/thread2.h> 76 #include <sys/malloc.h> 77 78 #include <machine/clock.h> 79 #include <machine/bus.h> 80 #include <machine/resource.h> 81 #include <sys/rman.h> 82 83 #include "lptio.h" 84 #include <bus/ppbus/ppbconf.h> 85 #include <bus/ppbus/ppb_1284.h> 86 #include "lpt.h" 87 #include "ppbus_if.h" 88 #include <bus/ppbus/ppbio.h> 89 90 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers"); 91 92 #ifndef LPT_DEBUG 93 #define lprintf(args) 94 #else 95 #define lprintf(args) \ 96 do { \ 97 if (lptflag) \ 98 printf args; \ 99 } while (0) 100 static int volatile lptflag = 1; 101 #endif 102 103 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 104 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 105 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 106 #define BUFSIZE 1024 107 #define BUFSTATSIZE 32 108 109 #define LPTUNIT(s) ((s)&0x03) 110 #define LPTFLAGS(s) ((s)&0xfc) 111 112 struct lpt_data { 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_UNITMASK 0x03 /* up to 4 units */ 119 #define LP_POS_INIT 0x04 /* if we are a postive init signal */ 120 #define LP_POS_ACK 0x08 /* if we are a positive going ack */ 121 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 122 #define LP_PRIMEOPEN 0x20 /* prime on every open */ 123 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 124 #define LP_BYPASS 0x80 /* bypass printer ready checks */ 125 void *sc_inbuf; 126 void *sc_statbuf; 127 short sc_xfercnt ; 128 char sc_primed; 129 char *sc_cp ; 130 u_short sc_irq ; /* IRQ status of port */ 131 #define LP_HAS_IRQ 0x01 /* we have an irq available */ 132 #define LP_USE_IRQ 0x02 /* we are using our irq */ 133 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 134 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 135 u_char sc_backoff ; /* time to call lptout() again */ 136 137 struct resource *intr_resource; /* interrupt resource */ 138 void *intr_cookie; /* interrupt registration cookie */ 139 struct callout sc_callout; 140 }; 141 142 #define LPT_NAME "lpt" /* our official name */ 143 144 static timeout_t lptout; 145 static int lpt_port_test(device_t dev, u_char data, u_char mask); 146 static int lpt_detect(device_t dev); 147 148 #define DEVTOSOFTC(dev) \ 149 ((struct lpt_data *)device_get_softc(dev)) 150 #define UNITOSOFTC(unit) \ 151 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit))) 152 #define UNITODEVICE(unit) \ 153 (devclass_get_device(lpt_devclass, (unit))) 154 155 static void lptintr(device_t dev); 156 static void lpt_intr(void *arg); /* without spls */ 157 158 static devclass_t lpt_devclass; 159 160 161 /* bits for state */ 162 #define OPEN (1<<0) /* device is open */ 163 #define ASLP (1<<1) /* awaiting draining of printer */ 164 #define EERROR (1<<2) /* error was received from printer */ 165 #define OBUSY (1<<3) /* printer is busy doing output */ 166 #define LPTOUT (1<<4) /* timeout while not selected */ 167 #define TOUT (1<<5) /* timeout while not selected */ 168 #define LPTINIT (1<<6) /* waiting to initialize for open */ 169 #define INTERRUPTED (1<<7) /* write call was interrupted */ 170 171 #define HAVEBUS (1<<8) /* the driver owns the bus */ 172 173 174 /* status masks to interrogate printer status */ 175 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 176 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 177 178 /* Printer Ready condition - from lpa.c */ 179 /* Only used in polling code */ 180 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 181 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 182 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 183 184 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 185 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 186 187 188 static d_open_t lptopen; 189 static d_close_t lptclose; 190 static d_write_t lptwrite; 191 static d_read_t lptread; 192 static d_ioctl_t lptioctl; 193 194 #define CDEV_MAJOR 16 195 static struct cdevsw lpt_cdevsw = { 196 /* name */ LPT_NAME, 197 /* maj */ CDEV_MAJOR, 198 /* flags */ 0, 199 /* port */ NULL, 200 /* clone */ NULL, 201 202 /* open */ lptopen, 203 /* close */ lptclose, 204 /* read */ lptread, 205 /* write */ lptwrite, 206 /* ioctl */ lptioctl, 207 /* poll */ nopoll, 208 /* mmap */ nommap, 209 /* strategy */ nostrategy, 210 /* dump */ nodump, 211 /* psize */ nopsize 212 }; 213 214 static int 215 lpt_request_ppbus(device_t dev, int how) 216 { 217 device_t ppbus = device_get_parent(dev); 218 struct lpt_data *sc = DEVTOSOFTC(dev); 219 int error; 220 221 if (sc->sc_state & HAVEBUS) 222 return (0); 223 224 /* we have the bus only if the request succeded */ 225 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 226 sc->sc_state |= HAVEBUS; 227 228 return (error); 229 } 230 231 static int 232 lpt_release_ppbus(device_t dev) 233 { 234 device_t ppbus = device_get_parent(dev); 235 struct lpt_data *sc = DEVTOSOFTC(dev); 236 int error = 0; 237 238 if ((error = ppb_release_bus(ppbus, dev)) == 0) 239 sc->sc_state &= ~HAVEBUS; 240 241 return (error); 242 } 243 244 /* 245 * Internal routine to lptprobe to do port tests of one byte value 246 */ 247 static int 248 lpt_port_test(device_t ppbus, u_char data, u_char mask) 249 { 250 int temp, timeout; 251 252 data = data & mask; 253 ppb_wdtr(ppbus, data); 254 timeout = 10000; 255 do { 256 DELAY(10); 257 temp = ppb_rdtr(ppbus) & mask; 258 } 259 while (temp != data && --timeout); 260 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 261 return (temp == data); 262 } 263 264 /* 265 * Probe simplified by replacing multiple loops with a hardcoded 266 * test pattern - 1999/02/08 des@freebsd.org 267 * 268 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 269 * Based partially on Rod Grimes' printer probe 270 * 271 * Logic: 272 * 1) If no port address was given, use the bios detected ports 273 * and autodetect what ports the printers are on. 274 * 2) Otherwise, probe the data port at the address given, 275 * using the method in Rod Grimes' port probe. 276 * (Much code ripped off directly from Rod's probe.) 277 * 278 * Comments from Rod's probe: 279 * Logic: 280 * 1) You should be able to write to and read back the same value 281 * to the data port. Do an alternating zeros, alternating ones, 282 * walking zero, and walking one test to check for stuck bits. 283 * 284 * 2) You should be able to write to and read back the same value 285 * to the control port lower 5 bits, the upper 3 bits are reserved 286 * per the IBM PC technical reference manauls and different boards 287 * do different things with them. Do an alternating zeros, alternating 288 * ones, walking zero, and walking one test to check for stuck bits. 289 * 290 * Some printers drag the strobe line down when the are powered off 291 * so this bit has been masked out of the control port test. 292 * 293 * XXX Some printers may not like a fast pulse on init or strobe, I 294 * don't know at this point, if that becomes a problem these bits 295 * should be turned off in the mask byte for the control port test. 296 * 297 * We are finally left with a mask of 0x14, due to some printers 298 * being adamant about holding other bits high ........ 299 * 300 * Before probing the control port, we write a 0 to the data port - 301 * If not, some printers chuck out garbage when the strobe line 302 * gets toggled. 303 * 304 * 3) Set the data and control ports to a value of 0 305 * 306 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 307 * Epson FX-1170 and C.Itoh 8510RM 308 * printers. 309 * Quick exit on fail added. 310 */ 311 static int 312 lpt_detect(device_t dev) 313 { 314 device_t ppbus = device_get_parent(dev); 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(dev, 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(ppbus, 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(ppbus, 0); 343 ppb_wctr(ppbus, 0); 344 345 lpt_release_ppbus(dev); 346 347 return (status); 348 } 349 350 /* 351 * lpt_probe() 352 */ 353 static int 354 lpt_probe(device_t dev) 355 { 356 struct lpt_data *sc; 357 358 sc = DEVTOSOFTC(dev); 359 bzero(sc, sizeof(struct lpt_data)); 360 361 /* 362 * Now, try to detect the printer. 363 */ 364 if (!lpt_detect(dev)) 365 return (ENXIO); 366 367 device_set_desc(dev, "Printer"); 368 369 return (0); 370 } 371 372 static int 373 lpt_attach(device_t dev) 374 { 375 device_t ppbus = device_get_parent(dev); 376 struct lpt_data *sc = DEVTOSOFTC(dev); 377 int zero = 0, unit = device_get_unit(dev); 378 int error; 379 uintptr_t irq; 380 381 sc->sc_primed = 0; /* not primed yet */ 382 callout_init(&sc->sc_callout); 383 384 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 385 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 386 return (0); 387 } 388 389 ppb_wctr(ppbus, LPC_NINIT); 390 391 /* check if we can use interrupt, should be done by ppc stuff */ 392 lprintf(("oldirq %x\n", sc->sc_irq)); 393 394 /* retrieve the ppbus irq */ 395 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 396 397 if (irq > 0) { 398 /* declare our interrupt handler */ 399 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 400 &zero, irq, irq, 1, RF_SHAREABLE); 401 } 402 if (sc->intr_resource) { 403 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 404 device_printf(dev, "Interrupt-driven port\n"); 405 } else { 406 sc->sc_irq = 0; 407 device_printf(dev, "Polled port\n"); 408 } 409 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 410 411 lpt_release_ppbus(dev); 412 413 cdevsw_add(&lpt_cdevsw, LP_UNITMASK, unit); 414 make_dev(&lpt_cdevsw, unit, 415 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 416 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 417 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 418 return (0); 419 } 420 421 static void 422 lptout(void *arg) 423 { 424 device_t dev = (device_t)arg; 425 struct lpt_data *sc = DEVTOSOFTC(dev); 426 #ifdef LPT_DEBUG 427 device_t ppbus = device_get_parent(dev); 428 #endif 429 430 lprintf(("T %x ", ppb_rstr(ppbus))); 431 if (sc->sc_state & OPEN) { 432 sc->sc_backoff++; 433 if (sc->sc_backoff > hz/LPTOUTMAX) 434 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 435 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, dev); 436 } else { 437 sc->sc_state &= ~TOUT; 438 } 439 440 if (sc->sc_state & EERROR) 441 sc->sc_state &= ~EERROR; 442 443 /* 444 * Avoid possible hangs due to missed interrupts 445 */ 446 if (sc->sc_xfercnt) { 447 lptintr(dev); 448 } else { 449 sc->sc_state &= ~OBUSY; 450 wakeup((caddr_t)dev); 451 } 452 } 453 454 /* 455 * lptopen -- reset the printer, then wait until it's selected and not busy. 456 * If LP_BYPASS flag is selected, then we do not try to select the 457 * printer -- this is just used for passing ioctls. 458 */ 459 460 static int 461 lptopen(dev_t dev, int flags, int fmt, struct thread *p) 462 { 463 int trys, err; 464 u_int unit = LPTUNIT(minor(dev)); 465 struct lpt_data *sc = UNITOSOFTC(unit); 466 device_t lptdev = UNITODEVICE(unit); 467 device_t ppbus = device_get_parent(lptdev); 468 469 if (!sc) 470 return (ENXIO); 471 472 if (sc->sc_state) { 473 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 474 return(EBUSY); 475 } else 476 sc->sc_state |= LPTINIT; 477 478 sc->sc_flags = LPTFLAGS(minor(dev)); 479 480 /* Check for open with BYPASS flag set. */ 481 if (sc->sc_flags & LP_BYPASS) { 482 sc->sc_state = OPEN; 483 return(0); 484 } 485 486 /* request the ppbus only if we don't have it already */ 487 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 488 /* give it a chance to try later */ 489 sc->sc_state = 0; 490 return (err); 491 } 492 493 crit_enter(); 494 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 495 496 /* set IRQ status according to ENABLE_IRQ flag 497 */ 498 if (sc->sc_irq & LP_ENABLE_IRQ) 499 sc->sc_irq |= LP_USE_IRQ; 500 else 501 sc->sc_irq &= ~LP_USE_IRQ; 502 503 /* init printer */ 504 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 505 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 506 ppb_wctr(ppbus, 0); 507 sc->sc_primed++; 508 DELAY(500); 509 } 510 } 511 512 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 513 514 /* wait till ready (printer running diagnostics) */ 515 trys = 0; 516 do { 517 /* ran out of waiting for the printer */ 518 if (trys++ >= LPINITRDY*4) { 519 crit_exit(); 520 sc->sc_state = 0; 521 lprintf(("status %x\n", ppb_rstr(ppbus))); 522 523 lpt_release_ppbus(lptdev); 524 return (EBUSY); 525 } 526 527 /* wait 1/4 second, give up if we get a signal */ 528 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) != 529 EWOULDBLOCK) { 530 sc->sc_state = 0; 531 crit_exit(); 532 533 lpt_release_ppbus(lptdev); 534 return (EBUSY); 535 } 536 537 /* is printer online and ready for output */ 538 } while ((ppb_rstr(ppbus) & 539 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 540 (LPS_SEL|LPS_NBSY|LPS_NERR)); 541 542 sc->sc_control = LPC_SEL|LPC_NINIT; 543 if (sc->sc_flags & LP_AUTOLF) 544 sc->sc_control |= LPC_AUTOL; 545 546 /* enable interrupt if interrupt-driven */ 547 if (sc->sc_irq & LP_USE_IRQ) 548 sc->sc_control |= LPC_ENA; 549 550 ppb_wctr(ppbus, sc->sc_control); 551 552 sc->sc_state = OPEN; 553 sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK); 554 sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK); 555 sc->sc_xfercnt = 0; 556 557 crit_exit(); 558 559 /* release the ppbus */ 560 lpt_release_ppbus(lptdev); 561 562 /* only use timeout if using interrupt */ 563 lprintf(("irq %x\n", sc->sc_irq)); 564 if (sc->sc_irq & LP_USE_IRQ) { 565 sc->sc_state |= TOUT; 566 sc->sc_backoff = hz / LPTOUTINITIAL; 567 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, lptdev); 568 } 569 570 lprintf(("opened.\n")); 571 return(0); 572 } 573 574 /* 575 * lptclose -- close the device, free the local line buffer. 576 * 577 * Check for interrupted write call added. 578 */ 579 580 static int 581 lptclose(dev_t dev, int flags, int fmt, struct thread *p) 582 { 583 u_int unit = LPTUNIT(minor(dev)); 584 struct lpt_data *sc = UNITOSOFTC(unit); 585 device_t lptdev = UNITODEVICE(unit); 586 device_t ppbus = device_get_parent(lptdev); 587 int err; 588 589 if(sc->sc_flags & LP_BYPASS) 590 goto end_close; 591 592 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 593 return (err); 594 595 sc->sc_state &= ~OPEN; 596 597 /* if the last write was interrupted, don't complete it */ 598 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) { 599 while ((ppb_rstr(ppbus) & 600 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 601 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) { 602 /* wait 1/4 second, give up if we get a signal */ 603 if (tsleep((caddr_t)lptdev, PCATCH, 604 "lpclose", hz) != EWOULDBLOCK) { 605 break; 606 } 607 } 608 } 609 callout_stop(&sc->sc_callout); 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 0, lpt_intr, lptdev, 762 &sc->intr_cookie, NULL); 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 crit_enter(); 898 899 lpt_intr(dev); 900 901 crit_exit(); 902 } 903 904 static int 905 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *p) 906 { 907 int error = 0; 908 u_int unit = LPTUNIT(minor(dev)); 909 struct lpt_data *sc = UNITOSOFTC(unit); 910 u_char old_sc_irq; /* old printer IRQ status */ 911 912 switch (cmd) { 913 case LPT_IRQ : 914 if(sc->sc_irq & LP_HAS_IRQ) { 915 /* 916 * NOTE: 917 * If the IRQ status is changed, 918 * this will only be visible on the 919 * next open. 920 * 921 * If interrupt status changes, 922 * this gets syslog'd. 923 */ 924 old_sc_irq = sc->sc_irq; 925 switch(*(int*)data) { 926 case 0: 927 sc->sc_irq &= (~LP_ENABLE_IRQ); 928 break; 929 case 1: 930 sc->sc_irq &= (~LP_ENABLE_EXT); 931 sc->sc_irq |= LP_ENABLE_IRQ; 932 break; 933 case 2: 934 /* classic irq based transfer and advanced 935 * modes are in conflict 936 */ 937 sc->sc_irq &= (~LP_ENABLE_IRQ); 938 sc->sc_irq |= LP_ENABLE_EXT; 939 break; 940 case 3: 941 sc->sc_irq &= (~LP_ENABLE_EXT); 942 break; 943 default: 944 break; 945 } 946 947 if (old_sc_irq != sc->sc_irq ) 948 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 949 unit, 950 (sc->sc_irq & LP_ENABLE_IRQ)? 951 "interrupt-driven":"polled", 952 (sc->sc_irq & LP_ENABLE_EXT)? 953 "extended":"standard"); 954 } else /* polled port */ 955 error = EOPNOTSUPP; 956 break; 957 default: 958 error = ENODEV; 959 } 960 961 return(error); 962 } 963 964 /* 965 * Because lpt is a static device that always exists under a ppbus device, 966 * and not scanned by the ppbus device, we need an identify function to 967 * install its device. 968 */ 969 static device_method_t lpt_methods[] = { 970 /* device interface */ 971 DEVMETHOD(device_identify, bus_generic_identify), 972 DEVMETHOD(device_probe, lpt_probe), 973 DEVMETHOD(device_attach, lpt_attach), 974 975 { 0, 0 } 976 }; 977 978 static driver_t lpt_driver = { 979 LPT_NAME, 980 lpt_methods, 981 sizeof(struct lpt_data), 982 }; 983 984 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 985 986