lpt.c revision 183397
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 */ 52 53#include <sys/cdefs.h> 54__FBSDID("$FreeBSD: head/sys/dev/ppbus/lpt.c 183397 2008-09-27 08:51:18Z ed $"); 55 56/* 57 * Device Driver for AT parallel printer port 58 * Written by William Jolitz 12/18/90 59 */ 60 61/* 62 * Updated for ppbus by Nicolas Souchu 63 * [Mon Jul 28 1997] 64 */ 65 66#include "opt_lpt.h" 67 68#include <sys/param.h> 69#include <sys/systm.h> 70#include <sys/module.h> 71#include <sys/bus.h> 72#include <sys/conf.h> 73#include <sys/kernel.h> 74#include <sys/uio.h> 75#include <sys/syslog.h> 76#include <sys/malloc.h> 77 78#include <machine/bus.h> 79#include <machine/resource.h> 80#include <sys/rman.h> 81 82#include <dev/ppbus/lptio.h> 83#include <dev/ppbus/ppbconf.h> 84#include <dev/ppbus/ppb_1284.h> 85#include <dev/ppbus/lpt.h> 86#include "ppbus_if.h" 87#include <dev/ppbus/ppbio.h> 88 89#ifndef LPT_DEBUG 90#define lprintf(args) 91#else 92#define lprintf(args) \ 93 do { \ 94 if (lptflag) \ 95 printf args; \ 96 } while (0) 97static int volatile lptflag = 1; 98#endif 99 100#define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 101#define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 102#define LPTOUTMAX 1 /* maximal timeout 1 s */ 103#define LPPRI (PZERO+8) 104#define BUFSIZE 1024 105#define BUFSTATSIZE 32 106 107#define LPTUNIT(s) ((s)&0x03) 108#define LPTFLAGS(s) ((s)&0xfc) 109 110struct lpt_data { 111 112 short sc_state; 113 /* default case: negative prime, negative ack, handshake strobe, 114 prime once */ 115 u_char sc_control; 116 char sc_flags; 117#define LP_POS_INIT 0x04 /* if we are a postive init signal */ 118#define LP_POS_ACK 0x08 /* if we are a positive going ack */ 119#define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 120#define LP_PRIMEOPEN 0x20 /* prime on every open */ 121#define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 122#define LP_BYPASS 0x80 /* bypass printer ready checks */ 123 void *sc_inbuf; 124 void *sc_statbuf; 125 short sc_xfercnt ; 126 char sc_primed; 127 char *sc_cp ; 128 u_short sc_irq ; /* IRQ status of port */ 129#define LP_HAS_IRQ 0x01 /* we have an irq available */ 130#define LP_USE_IRQ 0x02 /* we are using our irq */ 131#define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 132#define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 133 u_char sc_backoff ; /* time to call lptout() again */ 134 135 struct resource *intr_resource; /* interrupt resource */ 136 void *intr_cookie; /* interrupt registration cookie */ 137 138}; 139 140#define LPT_NAME "lpt" /* our official name */ 141 142static timeout_t lptout; 143static int lpt_port_test(device_t dev, u_char data, u_char mask); 144static int lpt_detect(device_t dev); 145 146#define DEVTOSOFTC(dev) \ 147 ((struct lpt_data *)device_get_softc(dev)) 148#define UNITOSOFTC(unit) \ 149 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit))) 150#define UNITODEVICE(unit) \ 151 (devclass_get_device(lpt_devclass, (unit))) 152 153static void lptintr(device_t dev); 154static void lpt_intr(void *arg); /* without spls */ 155 156static devclass_t lpt_devclass; 157 158 159/* bits for state */ 160#define OPEN (1<<0) /* device is open */ 161#define ASLP (1<<1) /* awaiting draining of printer */ 162#define EERROR (1<<2) /* error was received from printer */ 163#define OBUSY (1<<3) /* printer is busy doing output */ 164#define LPTOUT (1<<4) /* timeout while not selected */ 165#define TOUT (1<<5) /* timeout while not selected */ 166#define LPTINIT (1<<6) /* waiting to initialize for open */ 167#define INTERRUPTED (1<<7) /* write call was interrupted */ 168 169#define HAVEBUS (1<<8) /* the driver owns the bus */ 170 171 172/* status masks to interrogate printer status */ 173#define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 174#define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 175 176/* Printer Ready condition - from lpa.c */ 177/* Only used in polling code */ 178#define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 179#define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 180#define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 181 182#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 183#define MAX_SPIN 20 /* Max delay for device ready in usecs */ 184 185 186static d_open_t lptopen; 187static d_close_t lptclose; 188static d_write_t lptwrite; 189static d_read_t lptread; 190static d_ioctl_t lptioctl; 191 192static struct cdevsw lpt_cdevsw = { 193 .d_version = D_VERSION, 194 .d_flags = D_NEEDGIANT, 195 .d_open = lptopen, 196 .d_close = lptclose, 197 .d_read = lptread, 198 .d_write = lptwrite, 199 .d_ioctl = lptioctl, 200 .d_name = LPT_NAME, 201}; 202 203static int 204lpt_request_ppbus(device_t dev, int how) 205{ 206 device_t ppbus = device_get_parent(dev); 207 struct lpt_data *sc = DEVTOSOFTC(dev); 208 int error; 209 210 if (sc->sc_state & HAVEBUS) 211 return (0); 212 213 /* we have the bus only if the request succeded */ 214 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 215 sc->sc_state |= HAVEBUS; 216 217 return (error); 218} 219 220static int 221lpt_release_ppbus(device_t dev) 222{ 223 device_t ppbus = device_get_parent(dev); 224 struct lpt_data *sc = DEVTOSOFTC(dev); 225 int error = 0; 226 227 if ((error = ppb_release_bus(ppbus, dev)) == 0) 228 sc->sc_state &= ~HAVEBUS; 229 230 return (error); 231} 232 233/* 234 * Internal routine to lptprobe to do port tests of one byte value 235 */ 236static int 237lpt_port_test(device_t ppbus, u_char data, u_char mask) 238{ 239 int temp, timeout; 240 241 data = data & mask; 242 ppb_wdtr(ppbus, data); 243 timeout = 10000; 244 do { 245 DELAY(10); 246 temp = ppb_rdtr(ppbus) & mask; 247 } 248 while (temp != data && --timeout); 249 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 250 return (temp == data); 251} 252 253/* 254 * Probe simplified by replacing multiple loops with a hardcoded 255 * test pattern - 1999/02/08 des@freebsd.org 256 * 257 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 258 * Based partially on Rod Grimes' printer probe 259 * 260 * Logic: 261 * 1) If no port address was given, use the bios detected ports 262 * and autodetect what ports the printers are on. 263 * 2) Otherwise, probe the data port at the address given, 264 * using the method in Rod Grimes' port probe. 265 * (Much code ripped off directly from Rod's probe.) 266 * 267 * Comments from Rod's probe: 268 * Logic: 269 * 1) You should be able to write to and read back the same value 270 * to the data port. Do an alternating zeros, alternating ones, 271 * walking zero, and walking one test to check for stuck bits. 272 * 273 * 2) You should be able to write to and read back the same value 274 * to the control port lower 5 bits, the upper 3 bits are reserved 275 * per the IBM PC technical reference manauls and different boards 276 * do different things with them. Do an alternating zeros, alternating 277 * ones, walking zero, and walking one test to check for stuck bits. 278 * 279 * Some printers drag the strobe line down when the are powered off 280 * so this bit has been masked out of the control port test. 281 * 282 * XXX Some printers may not like a fast pulse on init or strobe, I 283 * don't know at this point, if that becomes a problem these bits 284 * should be turned off in the mask byte for the control port test. 285 * 286 * We are finally left with a mask of 0x14, due to some printers 287 * being adamant about holding other bits high ........ 288 * 289 * Before probing the control port, we write a 0 to the data port - 290 * If not, some printers chuck out garbage when the strobe line 291 * gets toggled. 292 * 293 * 3) Set the data and control ports to a value of 0 294 * 295 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 296 * Epson FX-1170 and C.Itoh 8510RM 297 * printers. 298 * Quick exit on fail added. 299 */ 300static int 301lpt_detect(device_t dev) 302{ 303 device_t ppbus = device_get_parent(dev); 304 305 static u_char testbyte[18] = { 306 0x55, /* alternating zeros */ 307 0xaa, /* alternating ones */ 308 0xfe, 0xfd, 0xfb, 0xf7, 309 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 310 0x01, 0x02, 0x04, 0x08, 311 0x10, 0x20, 0x40, 0x80 /* walking one */ 312 }; 313 int i, error, status; 314 315 status = 1; /* assume success */ 316 317 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 318 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 319 status = 0; 320 goto end_probe; 321 } 322 323 for (i = 0; i < 18 && status; i++) 324 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 325 status = 0; 326 goto end_probe; 327 } 328 329end_probe: 330 /* write 0's to control and data ports */ 331 ppb_wdtr(ppbus, 0); 332 ppb_wctr(ppbus, 0); 333 334 lpt_release_ppbus(dev); 335 336 return (status); 337} 338 339static void 340lpt_identify(driver_t *driver, device_t parent) 341{ 342 343 device_t dev; 344 345 dev = device_find_child(parent, LPT_NAME, -1); 346 if (!dev) 347 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1); 348} 349 350/* 351 * lpt_probe() 352 */ 353static int 354lpt_probe(device_t dev) 355{ 356 357 if (!lpt_detect(dev)) 358 return (ENXIO); 359 360 device_set_desc(dev, "Printer"); 361 362 return (0); 363} 364 365static int 366lpt_attach(device_t dev) 367{ 368 device_t ppbus = device_get_parent(dev); 369 struct lpt_data *sc = DEVTOSOFTC(dev); 370 int rid = 0, unit = device_get_unit(dev); 371 int error; 372 373 sc->sc_primed = 0; /* not primed yet */ 374 375 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 376 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 377 return (0); 378 } 379 380 ppb_wctr(ppbus, LPC_NINIT); 381 382 /* check if we can use interrupt, should be done by ppc stuff */ 383 lprintf(("oldirq %x\n", sc->sc_irq)); 384 385 /* declare our interrupt handler */ 386 sc->intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 387 RF_SHAREABLE); 388 if (sc->intr_resource) { 389 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 390 device_printf(dev, "Interrupt-driven port\n"); 391 } else { 392 sc->sc_irq = 0; 393 device_printf(dev, "Polled port\n"); 394 } 395 lprintf(("irq %x\n", sc->sc_irq)); 396 397 lpt_release_ppbus(dev); 398 399 make_dev(&lpt_cdevsw, unit, 400 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 401 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 402 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 403 return (0); 404} 405 406static int 407lpt_detach(device_t dev) 408{ 409 struct lpt_data *sc = DEVTOSOFTC(dev); 410 411 lpt_release_ppbus(dev); 412 if (sc->intr_resource != 0) { 413 BUS_TEARDOWN_INTR(device_get_parent(dev), dev, 414 sc->intr_resource, sc->intr_cookie); 415 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->intr_resource); 416 } 417 418 return (0); 419} 420 421static void 422lptout(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 timeout(lptout, (caddr_t)dev, sc->sc_backoff); 436 } else 437 sc->sc_state &= ~TOUT; 438 439 if (sc->sc_state & EERROR) 440 sc->sc_state &= ~EERROR; 441 442 /* 443 * Avoid possible hangs due to missed interrupts 444 */ 445 if (sc->sc_xfercnt) { 446 lptintr(dev); 447 } else { 448 sc->sc_state &= ~OBUSY; 449 wakeup(dev); 450 } 451} 452 453/* 454 * lptopen -- reset the printer, then wait until it's selected and not busy. 455 * If LP_BYPASS flag is selected, then we do not try to select the 456 * printer -- this is just used for passing ioctls. 457 */ 458 459static int 460lptopen(struct cdev *dev, int flags, int fmt, struct thread *td) 461{ 462 int s; 463 int trys, err; 464 u_int unit = LPTUNIT(dev2unit(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(dev2unit(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 s = spltty(); 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 splx(s); 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(lptdev, LPPRI|PCATCH, "lptinit", hz/4) != 529 EWOULDBLOCK) { 530 sc->sc_state = 0; 531 splx(s); 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_DEVBUF, M_WAITOK); 554 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK); 555 sc->sc_xfercnt = 0; 556 splx(s); 557 558 /* release the ppbus */ 559 lpt_release_ppbus(lptdev); 560 561 /* only use timeout if using interrupt */ 562 lprintf(("irq %x\n", sc->sc_irq)); 563 if (sc->sc_irq & LP_USE_IRQ) { 564 sc->sc_state |= TOUT; 565 timeout(lptout, (caddr_t)lptdev, 566 (sc->sc_backoff = hz/LPTOUTINITIAL)); 567 } 568 569 lprintf(("opened.\n")); 570 return(0); 571} 572 573/* 574 * lptclose -- close the device, free the local line buffer. 575 * 576 * Check for interrupted write call added. 577 */ 578 579static int 580lptclose(struct cdev *dev, int flags, int fmt, struct thread *td) 581{ 582 u_int unit = LPTUNIT(dev2unit(dev)); 583 struct lpt_data *sc = UNITOSOFTC(unit); 584 device_t lptdev = UNITODEVICE(unit); 585 device_t ppbus = device_get_parent(lptdev); 586 int err; 587 588 if(sc->sc_flags & LP_BYPASS) 589 goto end_close; 590 591 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 592 return (err); 593 594 sc->sc_state &= ~OPEN; 595 596 /* if the last write was interrupted, don't complete it */ 597 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 598 while ((ppb_rstr(ppbus) & 599 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 600 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 601 /* wait 1/4 second, give up if we get a signal */ 602 if (tsleep(lptdev, LPPRI|PCATCH, 603 "lpclose", hz) != EWOULDBLOCK) 604 break; 605 606 ppb_wctr(ppbus, LPC_NINIT); 607 free(sc->sc_inbuf, M_DEVBUF); 608 free(sc->sc_statbuf, M_DEVBUF); 609 610end_close: 611 /* release the bus anyway 612 * unregistration of interrupt forced by release 613 */ 614 lpt_release_ppbus(lptdev); 615 616 sc->sc_state = 0; 617 sc->sc_xfercnt = 0; 618 lprintf(("closed.\n")); 619 return(0); 620} 621 622/* 623 * lpt_pushbytes() 624 * Workhorse for actually spinning and writing bytes to printer 625 * Derived from lpa.c 626 * Originally by ? 627 * 628 * This code is only used when we are polling the port 629 */ 630static int 631lpt_pushbytes(device_t dev) 632{ 633 struct lpt_data *sc = DEVTOSOFTC(dev); 634 device_t ppbus = device_get_parent(dev); 635 int spin, err, tic; 636 char ch; 637 638 lprintf(("p")); 639 /* loop for every character .. */ 640 while (sc->sc_xfercnt > 0) { 641 /* printer data */ 642 ch = *(sc->sc_cp); 643 sc->sc_cp++; 644 sc->sc_xfercnt--; 645 646 /* 647 * Wait for printer ready. 648 * Loop 20 usecs testing BUSY bit, then sleep 649 * for exponentially increasing timeout. (vak) 650 */ 651 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 652 DELAY(1); /* XXX delay is NOT this accurate! */ 653 if (spin >= MAX_SPIN) { 654 tic = 0; 655 while (NOT_READY(ppbus)) { 656 /* 657 * Now sleep, every cycle a 658 * little longer .. 659 */ 660 tic = tic + tic + 1; 661 /* 662 * But no more than 10 seconds. (vak) 663 */ 664 if (tic > MAX_SLEEP) 665 tic = MAX_SLEEP; 666 err = tsleep(dev, LPPRI, 667 LPT_NAME "poll", tic); 668 if (err != EWOULDBLOCK) { 669 return (err); 670 } 671 } 672 } 673 674 /* output data */ 675 ppb_wdtr(ppbus, ch); 676 /* strobe */ 677 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 678 ppb_wctr(ppbus, sc->sc_control); 679 680 } 681 return(0); 682} 683 684/* 685 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 686 */ 687 688static int 689lptread(struct cdev *dev, struct uio *uio, int ioflag) 690{ 691 u_int unit = LPTUNIT(dev2unit(dev)); 692 struct lpt_data *sc = UNITOSOFTC(unit); 693 device_t lptdev = UNITODEVICE(unit); 694 device_t ppbus = device_get_parent(lptdev); 695 int error = 0, len; 696 697 if (sc->sc_flags & LP_BYPASS) { 698 /* we can't do reads in bypass mode */ 699 return (EPERM); 700 } 701 702 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 703 return (error); 704 705 /* read data in an other buffer, read/write may be simultaneous */ 706 len = 0; 707 while (uio->uio_resid) { 708 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 709 sc->sc_statbuf, min(BUFSTATSIZE, 710 uio->uio_resid), &len))) { 711 goto error; 712 } 713 714 if (!len) 715 goto error; /* no more data */ 716 717 if ((error = uiomove(sc->sc_statbuf, len, uio))) 718 goto error; 719 } 720 721error: 722 ppb_1284_terminate(ppbus); 723 return (error); 724} 725 726/* 727 * lptwrite --copy a line from user space to a local buffer, then call 728 * putc to get the chars moved to the output queue. 729 * 730 * Flagging of interrupted write added. 731 */ 732 733static int 734lptwrite(struct cdev *dev, struct uio *uio, int ioflag) 735{ 736 register unsigned n; 737 int err; 738 u_int unit = LPTUNIT(dev2unit(dev)); 739 struct lpt_data *sc = UNITOSOFTC(unit); 740 device_t lptdev = UNITODEVICE(unit); 741 device_t ppbus = device_get_parent(lptdev); 742 743 if(sc->sc_flags & LP_BYPASS) { 744 /* we can't do writes in bypass mode */ 745 return(EPERM); 746 } 747 748 /* request the ppbus only if we don't have it already */ 749 /* XXX interrupt registration?! */ 750 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 751 return (err); 752 753 /* if interrupts are working, register the handler */ 754 if (sc->sc_irq & LP_USE_IRQ) { 755 /* register our interrupt handler */ 756 err = bus_setup_intr(lptdev, sc->intr_resource, 757 INTR_TYPE_TTY, NULL, lpt_intr, lptdev, 758 &sc->intr_cookie); 759 if (err) { 760 device_printf(lptdev, "handler registration failed, polled mode.\n"); 761 sc->sc_irq &= ~LP_USE_IRQ; 762 } 763 } 764 765 sc->sc_state &= ~INTERRUPTED; 766 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 767 sc->sc_cp = sc->sc_inbuf; 768 uiomove(sc->sc_cp, n, uio); 769 sc->sc_xfercnt = n ; 770 771 if (sc->sc_irq & LP_ENABLE_EXT) { 772 /* try any extended mode */ 773 err = ppb_write(ppbus, sc->sc_cp, 774 sc->sc_xfercnt, 0); 775 switch (err) { 776 case 0: 777 /* if not all data was sent, we could rely 778 * on polling for the last bytes */ 779 sc->sc_xfercnt = 0; 780 break; 781 case EINTR: 782 sc->sc_state |= INTERRUPTED; 783 return(err); 784 case EINVAL: 785 /* advanced mode not avail */ 786 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 787 break; 788 default: 789 return(err); 790 } 791 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 792 lprintf(("i")); 793 /* if the printer is ready for a char, */ 794 /* give it one */ 795 if ((sc->sc_state & OBUSY) == 0){ 796 lprintf(("\nC %d. ", sc->sc_xfercnt)); 797 lptintr(lptdev); 798 } 799 lprintf(("W ")); 800 if (sc->sc_state & OBUSY) 801 if ((err = tsleep(lptdev, 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(lptdev); 813 814 if (err) 815 return(err); 816 } 817 } 818 819 /* we have not been interrupted, release the ppbus */ 820 lpt_release_ppbus(lptdev); 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 832static void 833lpt_intr(void *arg) 834{ 835 device_t lptdev = (device_t)arg; 836 device_t ppbus = device_get_parent(lptdev); 837 struct lpt_data *sc = DEVTOSOFTC(lptdev); 838 int sts = 0; 839 int i; 840 841 /* we must own the bus to use it */ 842 if ((sc->sc_state & HAVEBUS) == 0) 843 return; 844 845 /* 846 * Is printer online and ready for output? 847 * 848 * Avoid falling back to lptout() too quickly. First spin-loop 849 * to see if the printer will become ready ``really soon now''. 850 */ 851 for (i = 0; i < 100 && 852 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 853 854 if ((sts & RDY_MASK) == LP_READY) { 855 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 856 sc->sc_backoff = hz/LPTOUTINITIAL; 857 858 if (sc->sc_xfercnt) { 859 /* send char */ 860 /*lprintf(("%x ", *sc->sc_cp)); */ 861 ppb_wdtr(ppbus, *sc->sc_cp++) ; 862 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 863 /* DELAY(X) */ 864 ppb_wctr(ppbus, sc->sc_control); 865 866 /* any more data for printer */ 867 if(--(sc->sc_xfercnt) > 0) return; 868 } 869 870 /* 871 * No more data waiting for printer. 872 * Wakeup is not done if write call was not interrupted. 873 */ 874 sc->sc_state &= ~OBUSY; 875 876 if(!(sc->sc_state & INTERRUPTED)) 877 wakeup(lptdev); 878 lprintf(("w ")); 879 return; 880 } else { /* check for error */ 881 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 882 (sc->sc_state & OPEN)) 883 sc->sc_state |= EERROR; 884 /* lptout() will jump in and try to restart. */ 885 } 886 lprintf(("sts %x ", sts)); 887} 888 889static void 890lptintr(device_t dev) 891{ 892 /* call the interrupt at required spl level */ 893 int s = spltty(); 894 895 lpt_intr(dev); 896 897 splx(s); 898 return; 899} 900 901static int 902lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 903{ 904 int error = 0; 905 u_int unit = LPTUNIT(dev2unit(dev)); 906 struct lpt_data *sc = UNITOSOFTC(unit); 907 u_char old_sc_irq; /* old printer IRQ status */ 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 961static device_method_t lpt_methods[] = { 962 /* device interface */ 963 DEVMETHOD(device_identify, lpt_identify), 964 DEVMETHOD(device_probe, lpt_probe), 965 DEVMETHOD(device_attach, lpt_attach), 966 DEVMETHOD(device_detach, lpt_detach), 967 968 { 0, 0 } 969}; 970 971static driver_t lpt_driver = { 972 LPT_NAME, 973 lpt_methods, 974 sizeof(struct lpt_data), 975}; 976 977DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 978MODULE_DEPEND(lpt, ppbus, 1, 1, 1); 979