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 1.12 2005/06/16 16:21:30 joerg 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 static void 351 lpt_identify(driver_t *driver, device_t parent) 352 { 353 354 BUS_ADD_CHILD(parent, 0, LPT_NAME, 0); 355 } 356 357 /* 358 * lpt_probe() 359 */ 360 static int 361 lpt_probe(device_t dev) 362 { 363 struct lpt_data *sc; 364 365 sc = DEVTOSOFTC(dev); 366 bzero(sc, sizeof(struct lpt_data)); 367 368 /* 369 * Now, try to detect the printer. 370 */ 371 if (!lpt_detect(dev)) 372 return (ENXIO); 373 374 device_set_desc(dev, "Printer"); 375 376 return (0); 377 } 378 379 static int 380 lpt_attach(device_t dev) 381 { 382 device_t ppbus = device_get_parent(dev); 383 struct lpt_data *sc = DEVTOSOFTC(dev); 384 int zero = 0, unit = device_get_unit(dev); 385 int error; 386 uintptr_t irq; 387 388 sc->sc_primed = 0; /* not primed yet */ 389 callout_init(&sc->sc_callout); 390 391 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 392 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 393 return (0); 394 } 395 396 ppb_wctr(ppbus, LPC_NINIT); 397 398 /* check if we can use interrupt, should be done by ppc stuff */ 399 lprintf(("oldirq %x\n", sc->sc_irq)); 400 401 /* retrieve the ppbus irq */ 402 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 403 404 if (irq > 0) { 405 /* declare our interrupt handler */ 406 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 407 &zero, irq, irq, 1, RF_SHAREABLE); 408 } 409 if (sc->intr_resource) { 410 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 411 device_printf(dev, "Interrupt-driven port\n"); 412 } else { 413 sc->sc_irq = 0; 414 device_printf(dev, "Polled port\n"); 415 } 416 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 417 418 lpt_release_ppbus(dev); 419 420 cdevsw_add(&lpt_cdevsw, LP_UNITMASK, unit); 421 make_dev(&lpt_cdevsw, unit, 422 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 423 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 424 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 425 return (0); 426 } 427 428 static void 429 lptout(void *arg) 430 { 431 device_t dev = (device_t)arg; 432 struct lpt_data *sc = DEVTOSOFTC(dev); 433 #ifdef LPT_DEBUG 434 device_t ppbus = device_get_parent(dev); 435 #endif 436 437 lprintf(("T %x ", ppb_rstr(ppbus))); 438 if (sc->sc_state & OPEN) { 439 sc->sc_backoff++; 440 if (sc->sc_backoff > hz/LPTOUTMAX) 441 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 442 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, dev); 443 } else { 444 sc->sc_state &= ~TOUT; 445 } 446 447 if (sc->sc_state & EERROR) 448 sc->sc_state &= ~EERROR; 449 450 /* 451 * Avoid possible hangs due to missed interrupts 452 */ 453 if (sc->sc_xfercnt) { 454 lptintr(dev); 455 } else { 456 sc->sc_state &= ~OBUSY; 457 wakeup((caddr_t)dev); 458 } 459 } 460 461 /* 462 * lptopen -- reset the printer, then wait until it's selected and not busy. 463 * If LP_BYPASS flag is selected, then we do not try to select the 464 * printer -- this is just used for passing ioctls. 465 */ 466 467 static int 468 lptopen(dev_t dev, int flags, int fmt, struct thread *p) 469 { 470 int trys, err; 471 u_int unit = LPTUNIT(minor(dev)); 472 struct lpt_data *sc = UNITOSOFTC(unit); 473 device_t lptdev = UNITODEVICE(unit); 474 device_t ppbus = device_get_parent(lptdev); 475 476 if (!sc) 477 return (ENXIO); 478 479 if (sc->sc_state) { 480 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 481 return(EBUSY); 482 } else 483 sc->sc_state |= LPTINIT; 484 485 sc->sc_flags = LPTFLAGS(minor(dev)); 486 487 /* Check for open with BYPASS flag set. */ 488 if (sc->sc_flags & LP_BYPASS) { 489 sc->sc_state = OPEN; 490 return(0); 491 } 492 493 /* request the ppbus only if we don't have it already */ 494 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 495 /* give it a chance to try later */ 496 sc->sc_state = 0; 497 return (err); 498 } 499 500 crit_enter(); 501 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 502 503 /* set IRQ status according to ENABLE_IRQ flag 504 */ 505 if (sc->sc_irq & LP_ENABLE_IRQ) 506 sc->sc_irq |= LP_USE_IRQ; 507 else 508 sc->sc_irq &= ~LP_USE_IRQ; 509 510 /* init printer */ 511 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 512 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 513 ppb_wctr(ppbus, 0); 514 sc->sc_primed++; 515 DELAY(500); 516 } 517 } 518 519 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 520 521 /* wait till ready (printer running diagnostics) */ 522 trys = 0; 523 do { 524 /* ran out of waiting for the printer */ 525 if (trys++ >= LPINITRDY*4) { 526 crit_exit(); 527 sc->sc_state = 0; 528 lprintf(("status %x\n", ppb_rstr(ppbus))); 529 530 lpt_release_ppbus(lptdev); 531 return (EBUSY); 532 } 533 534 /* wait 1/4 second, give up if we get a signal */ 535 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) != 536 EWOULDBLOCK) { 537 sc->sc_state = 0; 538 crit_exit(); 539 540 lpt_release_ppbus(lptdev); 541 return (EBUSY); 542 } 543 544 /* is printer online and ready for output */ 545 } while ((ppb_rstr(ppbus) & 546 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 547 (LPS_SEL|LPS_NBSY|LPS_NERR)); 548 549 sc->sc_control = LPC_SEL|LPC_NINIT; 550 if (sc->sc_flags & LP_AUTOLF) 551 sc->sc_control |= LPC_AUTOL; 552 553 /* enable interrupt if interrupt-driven */ 554 if (sc->sc_irq & LP_USE_IRQ) 555 sc->sc_control |= LPC_ENA; 556 557 ppb_wctr(ppbus, sc->sc_control); 558 559 sc->sc_state = OPEN; 560 sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK); 561 sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK); 562 sc->sc_xfercnt = 0; 563 564 crit_exit(); 565 566 /* release the ppbus */ 567 lpt_release_ppbus(lptdev); 568 569 /* only use timeout if using interrupt */ 570 lprintf(("irq %x\n", sc->sc_irq)); 571 if (sc->sc_irq & LP_USE_IRQ) { 572 sc->sc_state |= TOUT; 573 sc->sc_backoff = hz / LPTOUTINITIAL; 574 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, lptdev); 575 } 576 577 lprintf(("opened.\n")); 578 return(0); 579 } 580 581 /* 582 * lptclose -- close the device, free the local line buffer. 583 * 584 * Check for interrupted write call added. 585 */ 586 587 static int 588 lptclose(dev_t dev, int flags, int fmt, struct thread *p) 589 { 590 u_int unit = LPTUNIT(minor(dev)); 591 struct lpt_data *sc = UNITOSOFTC(unit); 592 device_t lptdev = UNITODEVICE(unit); 593 device_t ppbus = device_get_parent(lptdev); 594 int err; 595 596 if(sc->sc_flags & LP_BYPASS) 597 goto end_close; 598 599 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 600 return (err); 601 602 sc->sc_state &= ~OPEN; 603 604 /* if the last write was interrupted, don't complete it */ 605 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) { 606 while ((ppb_rstr(ppbus) & 607 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 608 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) { 609 /* wait 1/4 second, give up if we get a signal */ 610 if (tsleep((caddr_t)lptdev, PCATCH, 611 "lpclose", hz) != EWOULDBLOCK) { 612 break; 613 } 614 } 615 } 616 callout_stop(&sc->sc_callout); 617 ppb_wctr(ppbus, LPC_NINIT); 618 free(sc->sc_inbuf, M_LPT); 619 free(sc->sc_statbuf, M_LPT); 620 621 end_close: 622 /* release the bus anyway 623 * unregistration of interrupt forced by release 624 */ 625 lpt_release_ppbus(lptdev); 626 627 sc->sc_state = 0; 628 sc->sc_xfercnt = 0; 629 lprintf(("closed.\n")); 630 return(0); 631 } 632 633 /* 634 * lpt_pushbytes() 635 * Workhorse for actually spinning and writing bytes to printer 636 * Derived from lpa.c 637 * Originally by ? 638 * 639 * This code is only used when we are polling the port 640 */ 641 static int 642 lpt_pushbytes(device_t dev) 643 { 644 struct lpt_data *sc = DEVTOSOFTC(dev); 645 device_t ppbus = device_get_parent(dev); 646 int spin, err, tic; 647 char ch; 648 649 lprintf(("p")); 650 /* loop for every character .. */ 651 while (sc->sc_xfercnt > 0) { 652 /* printer data */ 653 ch = *(sc->sc_cp); 654 sc->sc_cp++; 655 sc->sc_xfercnt--; 656 657 /* 658 * Wait for printer ready. 659 * Loop 20 usecs testing BUSY bit, then sleep 660 * for exponentially increasing timeout. (vak) 661 */ 662 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 663 DELAY(1); /* XXX delay is NOT this accurate! */ 664 if (spin >= MAX_SPIN) { 665 tic = 0; 666 while (NOT_READY(ppbus)) { 667 /* 668 * Now sleep, every cycle a 669 * little longer .. 670 */ 671 tic = tic + tic + 1; 672 /* 673 * But no more than 10 seconds. (vak) 674 */ 675 if (tic > MAX_SLEEP) 676 tic = MAX_SLEEP; 677 err = tsleep((caddr_t)dev, 0, 678 LPT_NAME "poll", tic); 679 if (err != EWOULDBLOCK) { 680 return (err); 681 } 682 } 683 } 684 685 /* output data */ 686 ppb_wdtr(ppbus, ch); 687 /* strobe */ 688 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 689 ppb_wctr(ppbus, sc->sc_control); 690 691 } 692 return(0); 693 } 694 695 /* 696 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 697 */ 698 699 static int 700 lptread(dev_t dev, struct uio *uio, int ioflag) 701 { 702 u_int unit = LPTUNIT(minor(dev)); 703 struct lpt_data *sc = UNITOSOFTC(unit); 704 device_t lptdev = UNITODEVICE(unit); 705 device_t ppbus = device_get_parent(lptdev); 706 int error = 0, len; 707 708 if (sc->sc_flags & LP_BYPASS) { 709 /* we can't do reads in bypass mode */ 710 return (EPERM); 711 } 712 713 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 714 return (error); 715 716 /* read data in an other buffer, read/write may be simultaneous */ 717 len = 0; 718 while (uio->uio_resid) { 719 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 720 sc->sc_statbuf, min(BUFSTATSIZE, 721 uio->uio_resid), &len))) { 722 goto error; 723 } 724 725 if (!len) 726 goto error; /* no more data */ 727 728 if ((error = uiomove(sc->sc_statbuf, len, uio))) 729 goto error; 730 } 731 732 error: 733 ppb_1284_terminate(ppbus); 734 return (error); 735 } 736 737 /* 738 * lptwrite --copy a line from user space to a local buffer, then call 739 * putc to get the chars moved to the output queue. 740 * 741 * Flagging of interrupted write added. 742 */ 743 744 static int 745 lptwrite(dev_t dev, struct uio *uio, int ioflag) 746 { 747 unsigned n; 748 int err; 749 u_int unit = LPTUNIT(minor(dev)); 750 struct lpt_data *sc = UNITOSOFTC(unit); 751 device_t lptdev = UNITODEVICE(unit); 752 device_t ppbus = device_get_parent(lptdev); 753 754 if(sc->sc_flags & LP_BYPASS) { 755 /* we can't do writes in bypass mode */ 756 return(EPERM); 757 } 758 759 /* request the ppbus only if we don't have it already */ 760 /* XXX interrupt registration?! */ 761 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 762 return (err); 763 764 /* if interrupts are working, register the handler */ 765 if (sc->sc_irq & LP_USE_IRQ) { 766 /* register our interrupt handler */ 767 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 768 INTR_TYPE_TTY, lpt_intr, lptdev, 769 &sc->intr_cookie, NULL); 770 if (err) { 771 device_printf(lptdev, "handler registration failed, polled mode.\n"); 772 sc->sc_irq &= ~LP_USE_IRQ; 773 } 774 } 775 776 sc->sc_state &= ~INTERRUPTED; 777 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 778 sc->sc_cp = sc->sc_inbuf; 779 uiomove(sc->sc_cp, n, uio); 780 sc->sc_xfercnt = n ; 781 782 if (sc->sc_irq & LP_ENABLE_EXT) { 783 /* try any extended mode */ 784 err = ppb_write(ppbus, sc->sc_cp, 785 sc->sc_xfercnt, 0); 786 switch (err) { 787 case 0: 788 /* if not all data was sent, we could rely 789 * on polling for the last bytes */ 790 sc->sc_xfercnt = 0; 791 break; 792 case EINTR: 793 sc->sc_state |= INTERRUPTED; 794 return(err); 795 case EINVAL: 796 /* advanced mode not avail */ 797 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 798 break; 799 default: 800 return(err); 801 } 802 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 803 lprintf(("i")); 804 /* if the printer is ready for a char, */ 805 /* give it one */ 806 if ((sc->sc_state & OBUSY) == 0){ 807 lprintf(("\nC %d. ", sc->sc_xfercnt)); 808 lptintr(lptdev); 809 } 810 lprintf(("W ")); 811 if (sc->sc_state & OBUSY) 812 if ((err = tsleep((caddr_t)lptdev, 813 PCATCH, LPT_NAME "write", 0))) { 814 sc->sc_state |= INTERRUPTED; 815 return(err); 816 } 817 } 818 819 /* check to see if we must do a polled write */ 820 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 821 lprintf(("p")); 822 823 err = lpt_pushbytes(lptdev); 824 825 if (err) 826 return(err); 827 } 828 } 829 830 /* we have not been interrupted, release the ppbus */ 831 lpt_release_ppbus(lptdev); 832 833 return(0); 834 } 835 836 /* 837 * lpt_intr -- handle printer interrupts which occur when the printer is 838 * ready to accept another char. 839 * 840 * do checking for interrupted write call. 841 */ 842 843 static void 844 lpt_intr(void *arg) 845 { 846 device_t lptdev = (device_t)arg; 847 device_t ppbus = device_get_parent(lptdev); 848 struct lpt_data *sc = DEVTOSOFTC(lptdev); 849 int sts = 0; 850 int i; 851 852 /* we must own the bus to use it */ 853 if ((sc->sc_state & HAVEBUS) == 0) 854 return; 855 856 /* 857 * Is printer online and ready for output? 858 * 859 * Avoid falling back to lptout() too quickly. First spin-loop 860 * to see if the printer will become ready ``really soon now''. 861 */ 862 for (i = 0; i < 100 && 863 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 864 865 if ((sts & RDY_MASK) == LP_READY) { 866 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 867 sc->sc_backoff = hz/LPTOUTINITIAL; 868 869 if (sc->sc_xfercnt) { 870 /* send char */ 871 /*lprintf(("%x ", *sc->sc_cp)); */ 872 ppb_wdtr(ppbus, *sc->sc_cp++) ; 873 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 874 /* DELAY(X) */ 875 ppb_wctr(ppbus, sc->sc_control); 876 877 /* any more data for printer */ 878 if(--(sc->sc_xfercnt) > 0) return; 879 } 880 881 /* 882 * No more data waiting for printer. 883 * Wakeup is not done if write call was not interrupted. 884 */ 885 sc->sc_state &= ~OBUSY; 886 887 if(!(sc->sc_state & INTERRUPTED)) 888 wakeup((caddr_t)lptdev); 889 lprintf(("w ")); 890 return; 891 } else { /* check for error */ 892 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 893 (sc->sc_state & OPEN)) 894 sc->sc_state |= EERROR; 895 /* lptout() will jump in and try to restart. */ 896 } 897 lprintf(("sts %x ", sts)); 898 } 899 900 static void 901 lptintr(device_t dev) 902 { 903 /* call the interrupt at required spl level */ 904 crit_enter(); 905 906 lpt_intr(dev); 907 908 crit_exit(); 909 } 910 911 static int 912 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *p) 913 { 914 int error = 0; 915 u_int unit = LPTUNIT(minor(dev)); 916 struct lpt_data *sc = UNITOSOFTC(unit); 917 u_char old_sc_irq; /* old printer IRQ status */ 918 919 switch (cmd) { 920 case LPT_IRQ : 921 if(sc->sc_irq & LP_HAS_IRQ) { 922 /* 923 * NOTE: 924 * If the IRQ status is changed, 925 * this will only be visible on the 926 * next open. 927 * 928 * If interrupt status changes, 929 * this gets syslog'd. 930 */ 931 old_sc_irq = sc->sc_irq; 932 switch(*(int*)data) { 933 case 0: 934 sc->sc_irq &= (~LP_ENABLE_IRQ); 935 break; 936 case 1: 937 sc->sc_irq &= (~LP_ENABLE_EXT); 938 sc->sc_irq |= LP_ENABLE_IRQ; 939 break; 940 case 2: 941 /* classic irq based transfer and advanced 942 * modes are in conflict 943 */ 944 sc->sc_irq &= (~LP_ENABLE_IRQ); 945 sc->sc_irq |= LP_ENABLE_EXT; 946 break; 947 case 3: 948 sc->sc_irq &= (~LP_ENABLE_EXT); 949 break; 950 default: 951 break; 952 } 953 954 if (old_sc_irq != sc->sc_irq ) 955 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 956 unit, 957 (sc->sc_irq & LP_ENABLE_IRQ)? 958 "interrupt-driven":"polled", 959 (sc->sc_irq & LP_ENABLE_EXT)? 960 "extended":"standard"); 961 } else /* polled port */ 962 error = EOPNOTSUPP; 963 break; 964 default: 965 error = ENODEV; 966 } 967 968 return(error); 969 } 970 971 static device_method_t lpt_methods[] = { 972 /* device interface */ 973 DEVMETHOD(device_identify, lpt_identify), 974 DEVMETHOD(device_probe, lpt_probe), 975 DEVMETHOD(device_attach, lpt_attach), 976 977 { 0, 0 } 978 }; 979 980 static driver_t lpt_driver = { 981 LPT_NAME, 982 lpt_methods, 983 sizeof(struct lpt_data), 984 }; 985 986 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 987