lpt.c revision 184164
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 184164 2008-10-22 15:00:22Z jhb $"); 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 107struct lpt_data { 108 device_t dev; 109 struct cdev *cdev; 110 struct cdev *cdev_bypass; 111 short sc_state; 112 /* default case: negative prime, negative ack, handshake strobe, 113 prime once */ 114 u_char sc_control; 115 char sc_flags; 116#define LP_POS_INIT 0x04 /* if we are a postive init signal */ 117#define LP_POS_ACK 0x08 /* if we are a positive going ack */ 118#define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 119#define LP_PRIMEOPEN 0x20 /* prime on every open */ 120#define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 121#define LP_BYPASS 0x80 /* bypass printer ready checks */ 122 void *sc_inbuf; 123 void *sc_statbuf; 124 short sc_xfercnt ; 125 char sc_primed; 126 char *sc_cp ; 127 u_short sc_irq ; /* IRQ status of port */ 128#define LP_HAS_IRQ 0x01 /* we have an irq available */ 129#define LP_USE_IRQ 0x02 /* we are using our irq */ 130#define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 131#define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 132 u_char sc_backoff ; /* time to call lptout() again */ 133 134 struct resource *intr_resource; /* interrupt resource */ 135 void *intr_cookie; /* interrupt registration cookie */ 136 137}; 138 139#define LPT_NAME "lpt" /* our official name */ 140 141static timeout_t lptout; 142static int lpt_port_test(device_t dev, u_char data, u_char mask); 143static int lpt_detect(device_t dev); 144 145#define DEVTOSOFTC(dev) \ 146 ((struct lpt_data *)device_get_softc(dev)) 147 148static void lptintr(device_t dev); 149static void lpt_intr(void *arg); /* without spls */ 150 151static devclass_t lpt_devclass; 152 153 154/* bits for state */ 155#define OPEN (1<<0) /* device is open */ 156#define ASLP (1<<1) /* awaiting draining of printer */ 157#define EERROR (1<<2) /* error was received from printer */ 158#define OBUSY (1<<3) /* printer is busy doing output */ 159#define LPTOUT (1<<4) /* timeout while not selected */ 160#define TOUT (1<<5) /* timeout while not selected */ 161#define LPTINIT (1<<6) /* waiting to initialize for open */ 162#define INTERRUPTED (1<<7) /* write call was interrupted */ 163 164#define HAVEBUS (1<<8) /* the driver owns the bus */ 165 166 167/* status masks to interrogate printer status */ 168#define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 169#define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 170 171/* Printer Ready condition - from lpa.c */ 172/* Only used in polling code */ 173#define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 174#define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 175#define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 176 177#define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 178#define MAX_SPIN 20 /* Max delay for device ready in usecs */ 179 180 181static d_open_t lptopen; 182static d_close_t lptclose; 183static d_write_t lptwrite; 184static d_read_t lptread; 185static d_ioctl_t lptioctl; 186 187static struct cdevsw lpt_cdevsw = { 188 .d_version = D_VERSION, 189 .d_flags = D_NEEDGIANT, 190 .d_open = lptopen, 191 .d_close = lptclose, 192 .d_read = lptread, 193 .d_write = lptwrite, 194 .d_ioctl = lptioctl, 195 .d_name = LPT_NAME, 196}; 197 198static int 199lpt_request_ppbus(device_t dev, int how) 200{ 201 device_t ppbus = device_get_parent(dev); 202 struct lpt_data *sc = DEVTOSOFTC(dev); 203 int error; 204 205 if (sc->sc_state & HAVEBUS) 206 return (0); 207 208 /* we have the bus only if the request succeded */ 209 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 210 sc->sc_state |= HAVEBUS; 211 212 return (error); 213} 214 215static int 216lpt_release_ppbus(device_t dev) 217{ 218 device_t ppbus = device_get_parent(dev); 219 struct lpt_data *sc = DEVTOSOFTC(dev); 220 int error = 0; 221 222 if ((error = ppb_release_bus(ppbus, dev)) == 0) 223 sc->sc_state &= ~HAVEBUS; 224 225 return (error); 226} 227 228/* 229 * Internal routine to lptprobe to do port tests of one byte value 230 */ 231static int 232lpt_port_test(device_t ppbus, u_char data, u_char mask) 233{ 234 int temp, timeout; 235 236 data = data & mask; 237 ppb_wdtr(ppbus, data); 238 timeout = 10000; 239 do { 240 DELAY(10); 241 temp = ppb_rdtr(ppbus) & mask; 242 } 243 while (temp != data && --timeout); 244 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 245 return (temp == data); 246} 247 248/* 249 * Probe simplified by replacing multiple loops with a hardcoded 250 * test pattern - 1999/02/08 des@freebsd.org 251 * 252 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 253 * Based partially on Rod Grimes' printer probe 254 * 255 * Logic: 256 * 1) If no port address was given, use the bios detected ports 257 * and autodetect what ports the printers are on. 258 * 2) Otherwise, probe the data port at the address given, 259 * using the method in Rod Grimes' port probe. 260 * (Much code ripped off directly from Rod's probe.) 261 * 262 * Comments from Rod's probe: 263 * Logic: 264 * 1) You should be able to write to and read back the same value 265 * to the data port. Do an alternating zeros, alternating ones, 266 * walking zero, and walking one test to check for stuck bits. 267 * 268 * 2) You should be able to write to and read back the same value 269 * to the control port lower 5 bits, the upper 3 bits are reserved 270 * per the IBM PC technical reference manauls and different boards 271 * do different things with them. Do an alternating zeros, alternating 272 * ones, walking zero, and walking one test to check for stuck bits. 273 * 274 * Some printers drag the strobe line down when the are powered off 275 * so this bit has been masked out of the control port test. 276 * 277 * XXX Some printers may not like a fast pulse on init or strobe, I 278 * don't know at this point, if that becomes a problem these bits 279 * should be turned off in the mask byte for the control port test. 280 * 281 * We are finally left with a mask of 0x14, due to some printers 282 * being adamant about holding other bits high ........ 283 * 284 * Before probing the control port, we write a 0 to the data port - 285 * If not, some printers chuck out garbage when the strobe line 286 * gets toggled. 287 * 288 * 3) Set the data and control ports to a value of 0 289 * 290 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 291 * Epson FX-1170 and C.Itoh 8510RM 292 * printers. 293 * Quick exit on fail added. 294 */ 295static int 296lpt_detect(device_t dev) 297{ 298 device_t ppbus = device_get_parent(dev); 299 300 static u_char testbyte[18] = { 301 0x55, /* alternating zeros */ 302 0xaa, /* alternating ones */ 303 0xfe, 0xfd, 0xfb, 0xf7, 304 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 305 0x01, 0x02, 0x04, 0x08, 306 0x10, 0x20, 0x40, 0x80 /* walking one */ 307 }; 308 int i, error, status; 309 310 status = 1; /* assume success */ 311 312 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 313 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 314 status = 0; 315 goto end_probe; 316 } 317 318 for (i = 0; i < 18 && status; i++) 319 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 320 status = 0; 321 goto end_probe; 322 } 323 324end_probe: 325 /* write 0's to control and data ports */ 326 ppb_wdtr(ppbus, 0); 327 ppb_wctr(ppbus, 0); 328 329 lpt_release_ppbus(dev); 330 331 return (status); 332} 333 334static void 335lpt_identify(driver_t *driver, device_t parent) 336{ 337 338 device_t dev; 339 340 dev = device_find_child(parent, LPT_NAME, -1); 341 if (!dev) 342 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1); 343} 344 345/* 346 * lpt_probe() 347 */ 348static int 349lpt_probe(device_t dev) 350{ 351 352 if (!lpt_detect(dev)) 353 return (ENXIO); 354 355 device_set_desc(dev, "Printer"); 356 357 return (0); 358} 359 360static int 361lpt_attach(device_t dev) 362{ 363 device_t ppbus = device_get_parent(dev); 364 struct lpt_data *sc = DEVTOSOFTC(dev); 365 int rid = 0, unit = device_get_unit(dev); 366 int error; 367 368 sc->sc_primed = 0; /* not primed yet */ 369 370 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 371 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 372 return (0); 373 } 374 375 ppb_wctr(ppbus, LPC_NINIT); 376 377 /* check if we can use interrupt, should be done by ppc stuff */ 378 lprintf(("oldirq %x\n", sc->sc_irq)); 379 380 /* declare our interrupt handler */ 381 sc->intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 382 RF_SHAREABLE); 383 if (sc->intr_resource) { 384 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 385 device_printf(dev, "Interrupt-driven port\n"); 386 } else { 387 sc->sc_irq = 0; 388 device_printf(dev, "Polled port\n"); 389 } 390 lprintf(("irq %x\n", sc->sc_irq)); 391 392 lpt_release_ppbus(dev); 393 394 sc->dev = dev; 395 sc->cdev = make_dev(&lpt_cdevsw, unit, 396 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 397 sc->cdev->si_drv1 = sc; 398 sc->cdev->si_drv2 = 0; 399 sc->cdev_bypass = make_dev(&lpt_cdevsw, unit, 400 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 401 sc->cdev_bypass->si_drv1 = sc; 402 sc->cdev_bypass->si_drv2 = (void *)LP_BYPASS; 403 return (0); 404} 405 406static int 407lpt_detach(device_t dev) 408{ 409 struct lpt_data *sc = DEVTOSOFTC(dev); 410 411 destroy_dev(sc->cdev); 412 destroy_dev(sc->cdev_bypass); 413 lpt_release_ppbus(dev); 414 if (sc->intr_resource != 0) { 415 BUS_TEARDOWN_INTR(device_get_parent(dev), dev, 416 sc->intr_resource, sc->intr_cookie); 417 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->intr_resource); 418 } 419 420 return (0); 421} 422 423static void 424lptout(void *arg) 425{ 426 device_t dev = (device_t)arg; 427 struct lpt_data *sc = DEVTOSOFTC(dev); 428#ifdef LPT_DEBUG 429 device_t ppbus = device_get_parent(dev); 430#endif 431 432 lprintf(("T %x ", ppb_rstr(ppbus))); 433 if (sc->sc_state & OPEN) { 434 sc->sc_backoff++; 435 if (sc->sc_backoff > hz/LPTOUTMAX) 436 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 437 timeout(lptout, (caddr_t)dev, sc->sc_backoff); 438 } else 439 sc->sc_state &= ~TOUT; 440 441 if (sc->sc_state & EERROR) 442 sc->sc_state &= ~EERROR; 443 444 /* 445 * Avoid possible hangs due to missed interrupts 446 */ 447 if (sc->sc_xfercnt) { 448 lptintr(dev); 449 } else { 450 sc->sc_state &= ~OBUSY; 451 wakeup(dev); 452 } 453} 454 455/* 456 * lptopen -- reset the printer, then wait until it's selected and not busy. 457 * If LP_BYPASS flag is selected, then we do not try to select the 458 * printer -- this is just used for passing ioctls. 459 */ 460 461static int 462lptopen(struct cdev *dev, int flags, int fmt, struct thread *td) 463{ 464 int s; 465 int trys, err; 466 struct lpt_data *sc = dev->si_drv1; 467 device_t lptdev = sc->dev; 468 device_t ppbus = device_get_parent(lptdev); 469 470 if (!sc) 471 return (ENXIO); 472 473 if (sc->sc_state) { 474 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 475 return(EBUSY); 476 } else 477 sc->sc_state |= LPTINIT; 478 479 sc->sc_flags = (uintptr_t)dev->si_drv2; 480 481 /* Check for open with BYPASS flag set. */ 482 if (sc->sc_flags & LP_BYPASS) { 483 sc->sc_state = OPEN; 484 return(0); 485 } 486 487 /* request the ppbus only if we don't have it already */ 488 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 489 /* give it a chance to try later */ 490 sc->sc_state = 0; 491 return (err); 492 } 493 494 s = spltty(); 495 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 496 497 /* set IRQ status according to ENABLE_IRQ flag 498 */ 499 if (sc->sc_irq & LP_ENABLE_IRQ) 500 sc->sc_irq |= LP_USE_IRQ; 501 else 502 sc->sc_irq &= ~LP_USE_IRQ; 503 504 /* init printer */ 505 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 506 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 507 ppb_wctr(ppbus, 0); 508 sc->sc_primed++; 509 DELAY(500); 510 } 511 } 512 513 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 514 515 /* wait till ready (printer running diagnostics) */ 516 trys = 0; 517 do { 518 /* ran out of waiting for the printer */ 519 if (trys++ >= LPINITRDY*4) { 520 splx(s); 521 sc->sc_state = 0; 522 lprintf(("status %x\n", ppb_rstr(ppbus))); 523 524 lpt_release_ppbus(lptdev); 525 return (EBUSY); 526 } 527 528 /* wait 1/4 second, give up if we get a signal */ 529 if (tsleep(lptdev, LPPRI|PCATCH, "lptinit", hz/4) != 530 EWOULDBLOCK) { 531 sc->sc_state = 0; 532 splx(s); 533 534 lpt_release_ppbus(lptdev); 535 return (EBUSY); 536 } 537 538 /* is printer online and ready for output */ 539 } while ((ppb_rstr(ppbus) & 540 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 541 (LPS_SEL|LPS_NBSY|LPS_NERR)); 542 543 sc->sc_control = LPC_SEL|LPC_NINIT; 544 if (sc->sc_flags & LP_AUTOLF) 545 sc->sc_control |= LPC_AUTOL; 546 547 /* enable interrupt if interrupt-driven */ 548 if (sc->sc_irq & LP_USE_IRQ) 549 sc->sc_control |= LPC_ENA; 550 551 ppb_wctr(ppbus, sc->sc_control); 552 553 sc->sc_state = OPEN; 554 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 555 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK); 556 sc->sc_xfercnt = 0; 557 splx(s); 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 timeout(lptout, (caddr_t)lptdev, 567 (sc->sc_backoff = hz/LPTOUTINITIAL)); 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 580static int 581lptclose(struct cdev *dev, int flags, int fmt, struct thread *td) 582{ 583 struct lpt_data *sc = dev->si_drv1; 584 device_t lptdev = sc->dev; 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 struct lpt_data *sc = dev->si_drv1; 692 device_t lptdev = sc->dev; 693 device_t ppbus = device_get_parent(lptdev); 694 int error = 0, len; 695 696 if (sc->sc_flags & LP_BYPASS) { 697 /* we can't do reads in bypass mode */ 698 return (EPERM); 699 } 700 701 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 702 return (error); 703 704 /* read data in an other buffer, read/write may be simultaneous */ 705 len = 0; 706 while (uio->uio_resid) { 707 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 708 sc->sc_statbuf, min(BUFSTATSIZE, 709 uio->uio_resid), &len))) { 710 goto error; 711 } 712 713 if (!len) 714 goto error; /* no more data */ 715 716 if ((error = uiomove(sc->sc_statbuf, len, uio))) 717 goto error; 718 } 719 720error: 721 ppb_1284_terminate(ppbus); 722 return (error); 723} 724 725/* 726 * lptwrite --copy a line from user space to a local buffer, then call 727 * putc to get the chars moved to the output queue. 728 * 729 * Flagging of interrupted write added. 730 */ 731 732static int 733lptwrite(struct cdev *dev, struct uio *uio, int ioflag) 734{ 735 register unsigned n; 736 int err; 737 struct lpt_data *sc = dev->si_drv1; 738 device_t lptdev = sc->dev; 739 device_t ppbus = device_get_parent(lptdev); 740 741 if(sc->sc_flags & LP_BYPASS) { 742 /* we can't do writes in bypass mode */ 743 return(EPERM); 744 } 745 746 /* request the ppbus only if we don't have it already */ 747 /* XXX interrupt registration?! */ 748 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 749 return (err); 750 751 /* if interrupts are working, register the handler */ 752 if (sc->sc_irq & LP_USE_IRQ) { 753 /* register our interrupt handler */ 754 err = bus_setup_intr(lptdev, sc->intr_resource, 755 INTR_TYPE_TTY, NULL, lpt_intr, lptdev, 756 &sc->intr_cookie); 757 if (err) { 758 device_printf(lptdev, "handler registration failed, polled mode.\n"); 759 sc->sc_irq &= ~LP_USE_IRQ; 760 } 761 } 762 763 sc->sc_state &= ~INTERRUPTED; 764 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 765 sc->sc_cp = sc->sc_inbuf; 766 uiomove(sc->sc_cp, n, uio); 767 sc->sc_xfercnt = n ; 768 769 if (sc->sc_irq & LP_ENABLE_EXT) { 770 /* try any extended mode */ 771 err = ppb_write(ppbus, sc->sc_cp, 772 sc->sc_xfercnt, 0); 773 switch (err) { 774 case 0: 775 /* if not all data was sent, we could rely 776 * on polling for the last bytes */ 777 sc->sc_xfercnt = 0; 778 break; 779 case EINTR: 780 sc->sc_state |= INTERRUPTED; 781 return(err); 782 case EINVAL: 783 /* advanced mode not avail */ 784 log(LOG_NOTICE, 785 "%s: advanced mode not avail, polling\n", 786 device_get_nameunit(sc->dev)); 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 struct lpt_data *sc = dev->si_drv1; 906 u_char old_sc_irq; /* old printer IRQ status */ 907 908 switch (cmd) { 909 case LPT_IRQ : 910 if(sc->sc_irq & LP_HAS_IRQ) { 911 /* 912 * NOTE: 913 * If the IRQ status is changed, 914 * this will only be visible on the 915 * next open. 916 * 917 * If interrupt status changes, 918 * this gets syslog'd. 919 */ 920 old_sc_irq = sc->sc_irq; 921 switch(*(int*)data) { 922 case 0: 923 sc->sc_irq &= (~LP_ENABLE_IRQ); 924 break; 925 case 1: 926 sc->sc_irq &= (~LP_ENABLE_EXT); 927 sc->sc_irq |= LP_ENABLE_IRQ; 928 break; 929 case 2: 930 /* classic irq based transfer and advanced 931 * modes are in conflict 932 */ 933 sc->sc_irq &= (~LP_ENABLE_IRQ); 934 sc->sc_irq |= LP_ENABLE_EXT; 935 break; 936 case 3: 937 sc->sc_irq &= (~LP_ENABLE_EXT); 938 break; 939 default: 940 break; 941 } 942 943 if (old_sc_irq != sc->sc_irq ) 944 log(LOG_NOTICE, "%s: switched to %s %s mode\n", 945 device_get_nameunit(sc->dev), 946 (sc->sc_irq & LP_ENABLE_IRQ)? 947 "interrupt-driven":"polled", 948 (sc->sc_irq & LP_ENABLE_EXT)? 949 "extended":"standard"); 950 } else /* polled port */ 951 error = EOPNOTSUPP; 952 break; 953 default: 954 error = ENODEV; 955 } 956 957 return(error); 958} 959 960static device_method_t lpt_methods[] = { 961 /* device interface */ 962 DEVMETHOD(device_identify, lpt_identify), 963 DEVMETHOD(device_probe, lpt_probe), 964 DEVMETHOD(device_attach, lpt_attach), 965 DEVMETHOD(device_detach, lpt_detach), 966 967 { 0, 0 } 968}; 969 970static driver_t lpt_driver = { 971 LPT_NAME, 972 lpt_methods, 973 sizeof(struct lpt_data), 974}; 975 976DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 977MODULE_DEPEND(lpt, ppbus, 1, 1, 1); 978