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 1.9 2004/05/19 22:52:43 dillon Exp $ 53 */ 54 55 /* 56 * Device Driver for AT parallel printer port 57 * Written by William Jolitz 12/18/90 58 */ 59 60 /* 61 * Updated for ppbus by Nicolas Souchu 62 * [Mon Jul 28 1997] 63 */ 64 65 #include "opt_lpt.h" 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/module.h> 70 #include <sys/bus.h> 71 #include <sys/conf.h> 72 #include <sys/kernel.h> 73 #include <sys/uio.h> 74 #include <sys/syslog.h> 75 #include <sys/malloc.h> 76 77 #include <machine/clock.h> 78 #include <machine/bus.h> 79 #include <machine/resource.h> 80 #include <sys/rman.h> 81 82 #include "lptio.h" 83 #include <bus/ppbus/ppbconf.h> 84 #include <bus/ppbus/ppb_1284.h> 85 #include "lpt.h" 86 #include "ppbus_if.h" 87 #include <bus/ppbus/ppbio.h> 88 89 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers"); 90 91 #ifndef LPT_DEBUG 92 #define lprintf(args) 93 #else 94 #define lprintf(args) \ 95 do { \ 96 if (lptflag) \ 97 printf args; \ 98 } while (0) 99 static int volatile lptflag = 1; 100 #endif 101 102 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 103 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 104 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 105 #define BUFSIZE 1024 106 #define BUFSTATSIZE 32 107 108 #define LPTUNIT(s) ((s)&0x03) 109 #define LPTFLAGS(s) ((s)&0xfc) 110 111 struct lpt_data { 112 113 short sc_state; 114 /* default case: negative prime, negative ack, handshake strobe, 115 prime once */ 116 u_char sc_control; 117 char sc_flags; 118 #define LP_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 */ 139 140 }; 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 */ 389 390 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 391 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 392 return (0); 393 } 394 395 ppb_wctr(ppbus, LPC_NINIT); 396 397 /* check if we can use interrupt, should be done by ppc stuff */ 398 lprintf(("oldirq %x\n", sc->sc_irq)); 399 400 /* retrieve the ppbus irq */ 401 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 402 403 if (irq > 0) { 404 /* declare our interrupt handler */ 405 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 406 &zero, irq, irq, 1, RF_SHAREABLE); 407 } 408 if (sc->intr_resource) { 409 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 410 device_printf(dev, "Interrupt-driven port\n"); 411 } else { 412 sc->sc_irq = 0; 413 device_printf(dev, "Polled port\n"); 414 } 415 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 416 417 lpt_release_ppbus(dev); 418 419 cdevsw_add(&lpt_cdevsw, LP_UNITMASK, unit); 420 make_dev(&lpt_cdevsw, unit, 421 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 422 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 423 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 424 return (0); 425 } 426 427 static void 428 lptout(void *arg) 429 { 430 device_t dev = (device_t)arg; 431 struct lpt_data *sc = DEVTOSOFTC(dev); 432 #ifdef LPT_DEBUG 433 device_t ppbus = device_get_parent(dev); 434 #endif 435 436 lprintf(("T %x ", ppb_rstr(ppbus))); 437 if (sc->sc_state & OPEN) { 438 sc->sc_backoff++; 439 if (sc->sc_backoff > hz/LPTOUTMAX) 440 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 441 timeout(lptout, (caddr_t)dev, sc->sc_backoff); 442 } else 443 sc->sc_state &= ~TOUT; 444 445 if (sc->sc_state & EERROR) 446 sc->sc_state &= ~EERROR; 447 448 /* 449 * Avoid possible hangs due to missed interrupts 450 */ 451 if (sc->sc_xfercnt) { 452 lptintr(dev); 453 } else { 454 sc->sc_state &= ~OBUSY; 455 wakeup((caddr_t)dev); 456 } 457 } 458 459 /* 460 * lptopen -- reset the printer, then wait until it's selected and not busy. 461 * If LP_BYPASS flag is selected, then we do not try to select the 462 * printer -- this is just used for passing ioctls. 463 */ 464 465 static int 466 lptopen(dev_t dev, int flags, int fmt, struct thread *p) 467 { 468 int s; 469 int trys, err; 470 u_int unit = LPTUNIT(minor(dev)); 471 struct lpt_data *sc = UNITOSOFTC(unit); 472 device_t lptdev = UNITODEVICE(unit); 473 device_t ppbus = device_get_parent(lptdev); 474 475 if (!sc) 476 return (ENXIO); 477 478 if (sc->sc_state) { 479 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 480 return(EBUSY); 481 } else 482 sc->sc_state |= LPTINIT; 483 484 sc->sc_flags = LPTFLAGS(minor(dev)); 485 486 /* Check for open with BYPASS flag set. */ 487 if (sc->sc_flags & LP_BYPASS) { 488 sc->sc_state = OPEN; 489 return(0); 490 } 491 492 /* request the ppbus only if we don't have it already */ 493 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 494 /* give it a chance to try later */ 495 sc->sc_state = 0; 496 return (err); 497 } 498 499 s = spltty(); 500 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 501 502 /* set IRQ status according to ENABLE_IRQ flag 503 */ 504 if (sc->sc_irq & LP_ENABLE_IRQ) 505 sc->sc_irq |= LP_USE_IRQ; 506 else 507 sc->sc_irq &= ~LP_USE_IRQ; 508 509 /* init printer */ 510 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 511 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 512 ppb_wctr(ppbus, 0); 513 sc->sc_primed++; 514 DELAY(500); 515 } 516 } 517 518 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 519 520 /* wait till ready (printer running diagnostics) */ 521 trys = 0; 522 do { 523 /* ran out of waiting for the printer */ 524 if (trys++ >= LPINITRDY*4) { 525 splx(s); 526 sc->sc_state = 0; 527 lprintf(("status %x\n", ppb_rstr(ppbus))); 528 529 lpt_release_ppbus(lptdev); 530 return (EBUSY); 531 } 532 533 /* wait 1/4 second, give up if we get a signal */ 534 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) != 535 EWOULDBLOCK) { 536 sc->sc_state = 0; 537 splx(s); 538 539 lpt_release_ppbus(lptdev); 540 return (EBUSY); 541 } 542 543 /* is printer online and ready for output */ 544 } while ((ppb_rstr(ppbus) & 545 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 546 (LPS_SEL|LPS_NBSY|LPS_NERR)); 547 548 sc->sc_control = LPC_SEL|LPC_NINIT; 549 if (sc->sc_flags & LP_AUTOLF) 550 sc->sc_control |= LPC_AUTOL; 551 552 /* enable interrupt if interrupt-driven */ 553 if (sc->sc_irq & LP_USE_IRQ) 554 sc->sc_control |= LPC_ENA; 555 556 ppb_wctr(ppbus, sc->sc_control); 557 558 sc->sc_state = OPEN; 559 sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK); 560 sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK); 561 sc->sc_xfercnt = 0; 562 splx(s); 563 564 /* release the ppbus */ 565 lpt_release_ppbus(lptdev); 566 567 /* only use timeout if using interrupt */ 568 lprintf(("irq %x\n", sc->sc_irq)); 569 if (sc->sc_irq & LP_USE_IRQ) { 570 sc->sc_state |= TOUT; 571 timeout(lptout, (caddr_t)lptdev, 572 (sc->sc_backoff = hz/LPTOUTINITIAL)); 573 } 574 575 lprintf(("opened.\n")); 576 return(0); 577 } 578 579 /* 580 * lptclose -- close the device, free the local line buffer. 581 * 582 * Check for interrupted write call added. 583 */ 584 585 static int 586 lptclose(dev_t dev, int flags, int fmt, struct thread *p) 587 { 588 u_int unit = LPTUNIT(minor(dev)); 589 struct lpt_data *sc = UNITOSOFTC(unit); 590 device_t lptdev = UNITODEVICE(unit); 591 device_t ppbus = device_get_parent(lptdev); 592 int err; 593 594 if(sc->sc_flags & LP_BYPASS) 595 goto end_close; 596 597 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 598 return (err); 599 600 sc->sc_state &= ~OPEN; 601 602 /* if the last write was interrupted, don't complete it */ 603 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 604 while ((ppb_rstr(ppbus) & 605 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 606 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 607 /* wait 1/4 second, give up if we get a signal */ 608 if (tsleep((caddr_t)lptdev, PCATCH, 609 "lpclose", hz) != EWOULDBLOCK) 610 break; 611 612 ppb_wctr(ppbus, LPC_NINIT); 613 free(sc->sc_inbuf, M_LPT); 614 free(sc->sc_statbuf, M_LPT); 615 616 end_close: 617 /* release the bus anyway 618 * unregistration of interrupt forced by release 619 */ 620 lpt_release_ppbus(lptdev); 621 622 sc->sc_state = 0; 623 sc->sc_xfercnt = 0; 624 lprintf(("closed.\n")); 625 return(0); 626 } 627 628 /* 629 * lpt_pushbytes() 630 * Workhorse for actually spinning and writing bytes to printer 631 * Derived from lpa.c 632 * Originally by ? 633 * 634 * This code is only used when we are polling the port 635 */ 636 static int 637 lpt_pushbytes(device_t dev) 638 { 639 struct lpt_data *sc = DEVTOSOFTC(dev); 640 device_t ppbus = device_get_parent(dev); 641 int spin, err, tic; 642 char ch; 643 644 lprintf(("p")); 645 /* loop for every character .. */ 646 while (sc->sc_xfercnt > 0) { 647 /* printer data */ 648 ch = *(sc->sc_cp); 649 sc->sc_cp++; 650 sc->sc_xfercnt--; 651 652 /* 653 * Wait for printer ready. 654 * Loop 20 usecs testing BUSY bit, then sleep 655 * for exponentially increasing timeout. (vak) 656 */ 657 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 658 DELAY(1); /* XXX delay is NOT this accurate! */ 659 if (spin >= MAX_SPIN) { 660 tic = 0; 661 while (NOT_READY(ppbus)) { 662 /* 663 * Now sleep, every cycle a 664 * little longer .. 665 */ 666 tic = tic + tic + 1; 667 /* 668 * But no more than 10 seconds. (vak) 669 */ 670 if (tic > MAX_SLEEP) 671 tic = MAX_SLEEP; 672 err = tsleep((caddr_t)dev, 0, 673 LPT_NAME "poll", tic); 674 if (err != EWOULDBLOCK) { 675 return (err); 676 } 677 } 678 } 679 680 /* output data */ 681 ppb_wdtr(ppbus, ch); 682 /* strobe */ 683 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 684 ppb_wctr(ppbus, sc->sc_control); 685 686 } 687 return(0); 688 } 689 690 /* 691 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 692 */ 693 694 static int 695 lptread(dev_t dev, struct uio *uio, int ioflag) 696 { 697 u_int unit = LPTUNIT(minor(dev)); 698 struct lpt_data *sc = UNITOSOFTC(unit); 699 device_t lptdev = UNITODEVICE(unit); 700 device_t ppbus = device_get_parent(lptdev); 701 int error = 0, len; 702 703 if (sc->sc_flags & LP_BYPASS) { 704 /* we can't do reads in bypass mode */ 705 return (EPERM); 706 } 707 708 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 709 return (error); 710 711 /* read data in an other buffer, read/write may be simultaneous */ 712 len = 0; 713 while (uio->uio_resid) { 714 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 715 sc->sc_statbuf, min(BUFSTATSIZE, 716 uio->uio_resid), &len))) { 717 goto error; 718 } 719 720 if (!len) 721 goto error; /* no more data */ 722 723 if ((error = uiomove(sc->sc_statbuf, len, uio))) 724 goto error; 725 } 726 727 error: 728 ppb_1284_terminate(ppbus); 729 return (error); 730 } 731 732 /* 733 * lptwrite --copy a line from user space to a local buffer, then call 734 * putc to get the chars moved to the output queue. 735 * 736 * Flagging of interrupted write added. 737 */ 738 739 static int 740 lptwrite(dev_t dev, struct uio *uio, int ioflag) 741 { 742 unsigned n; 743 int err; 744 u_int unit = LPTUNIT(minor(dev)); 745 struct lpt_data *sc = UNITOSOFTC(unit); 746 device_t lptdev = UNITODEVICE(unit); 747 device_t ppbus = device_get_parent(lptdev); 748 749 if(sc->sc_flags & LP_BYPASS) { 750 /* we can't do writes in bypass mode */ 751 return(EPERM); 752 } 753 754 /* request the ppbus only if we don't have it already */ 755 /* XXX interrupt registration?! */ 756 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 757 return (err); 758 759 /* if interrupts are working, register the handler */ 760 if (sc->sc_irq & LP_USE_IRQ) { 761 /* register our interrupt handler */ 762 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 763 INTR_TYPE_TTY, lpt_intr, lptdev, 764 &sc->intr_cookie); 765 if (err) { 766 device_printf(lptdev, "handler registration failed, polled mode.\n"); 767 sc->sc_irq &= ~LP_USE_IRQ; 768 } 769 } 770 771 sc->sc_state &= ~INTERRUPTED; 772 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 773 sc->sc_cp = sc->sc_inbuf; 774 uiomove(sc->sc_cp, n, uio); 775 sc->sc_xfercnt = n ; 776 777 if (sc->sc_irq & LP_ENABLE_EXT) { 778 /* try any extended mode */ 779 err = ppb_write(ppbus, sc->sc_cp, 780 sc->sc_xfercnt, 0); 781 switch (err) { 782 case 0: 783 /* if not all data was sent, we could rely 784 * on polling for the last bytes */ 785 sc->sc_xfercnt = 0; 786 break; 787 case EINTR: 788 sc->sc_state |= INTERRUPTED; 789 return(err); 790 case EINVAL: 791 /* advanced mode not avail */ 792 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 793 break; 794 default: 795 return(err); 796 } 797 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 798 lprintf(("i")); 799 /* if the printer is ready for a char, */ 800 /* give it one */ 801 if ((sc->sc_state & OBUSY) == 0){ 802 lprintf(("\nC %d. ", sc->sc_xfercnt)); 803 lptintr(lptdev); 804 } 805 lprintf(("W ")); 806 if (sc->sc_state & OBUSY) 807 if ((err = tsleep((caddr_t)lptdev, 808 PCATCH, LPT_NAME "write", 0))) { 809 sc->sc_state |= INTERRUPTED; 810 return(err); 811 } 812 } 813 814 /* check to see if we must do a polled write */ 815 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 816 lprintf(("p")); 817 818 err = lpt_pushbytes(lptdev); 819 820 if (err) 821 return(err); 822 } 823 } 824 825 /* we have not been interrupted, release the ppbus */ 826 lpt_release_ppbus(lptdev); 827 828 return(0); 829 } 830 831 /* 832 * lpt_intr -- handle printer interrupts which occur when the printer is 833 * ready to accept another char. 834 * 835 * do checking for interrupted write call. 836 */ 837 838 static void 839 lpt_intr(void *arg) 840 { 841 device_t lptdev = (device_t)arg; 842 device_t ppbus = device_get_parent(lptdev); 843 struct lpt_data *sc = DEVTOSOFTC(lptdev); 844 int sts = 0; 845 int i; 846 847 /* we must own the bus to use it */ 848 if ((sc->sc_state & HAVEBUS) == 0) 849 return; 850 851 /* 852 * Is printer online and ready for output? 853 * 854 * Avoid falling back to lptout() too quickly. First spin-loop 855 * to see if the printer will become ready ``really soon now''. 856 */ 857 for (i = 0; i < 100 && 858 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 859 860 if ((sts & RDY_MASK) == LP_READY) { 861 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 862 sc->sc_backoff = hz/LPTOUTINITIAL; 863 864 if (sc->sc_xfercnt) { 865 /* send char */ 866 /*lprintf(("%x ", *sc->sc_cp)); */ 867 ppb_wdtr(ppbus, *sc->sc_cp++) ; 868 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 869 /* DELAY(X) */ 870 ppb_wctr(ppbus, sc->sc_control); 871 872 /* any more data for printer */ 873 if(--(sc->sc_xfercnt) > 0) return; 874 } 875 876 /* 877 * No more data waiting for printer. 878 * Wakeup is not done if write call was not interrupted. 879 */ 880 sc->sc_state &= ~OBUSY; 881 882 if(!(sc->sc_state & INTERRUPTED)) 883 wakeup((caddr_t)lptdev); 884 lprintf(("w ")); 885 return; 886 } else { /* check for error */ 887 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 888 (sc->sc_state & OPEN)) 889 sc->sc_state |= EERROR; 890 /* lptout() will jump in and try to restart. */ 891 } 892 lprintf(("sts %x ", sts)); 893 } 894 895 static void 896 lptintr(device_t dev) 897 { 898 /* call the interrupt at required spl level */ 899 int s = spltty(); 900 901 lpt_intr(dev); 902 903 splx(s); 904 return; 905 } 906 907 static int 908 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct thread *p) 909 { 910 int error = 0; 911 u_int unit = LPTUNIT(minor(dev)); 912 struct lpt_data *sc = UNITOSOFTC(unit); 913 u_char old_sc_irq; /* old printer IRQ status */ 914 915 switch (cmd) { 916 case LPT_IRQ : 917 if(sc->sc_irq & LP_HAS_IRQ) { 918 /* 919 * NOTE: 920 * If the IRQ status is changed, 921 * this will only be visible on the 922 * next open. 923 * 924 * If interrupt status changes, 925 * this gets syslog'd. 926 */ 927 old_sc_irq = sc->sc_irq; 928 switch(*(int*)data) { 929 case 0: 930 sc->sc_irq &= (~LP_ENABLE_IRQ); 931 break; 932 case 1: 933 sc->sc_irq &= (~LP_ENABLE_EXT); 934 sc->sc_irq |= LP_ENABLE_IRQ; 935 break; 936 case 2: 937 /* classic irq based transfer and advanced 938 * modes are in conflict 939 */ 940 sc->sc_irq &= (~LP_ENABLE_IRQ); 941 sc->sc_irq |= LP_ENABLE_EXT; 942 break; 943 case 3: 944 sc->sc_irq &= (~LP_ENABLE_EXT); 945 break; 946 default: 947 break; 948 } 949 950 if (old_sc_irq != sc->sc_irq ) 951 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 952 unit, 953 (sc->sc_irq & LP_ENABLE_IRQ)? 954 "interrupt-driven":"polled", 955 (sc->sc_irq & LP_ENABLE_EXT)? 956 "extended":"standard"); 957 } else /* polled port */ 958 error = EOPNOTSUPP; 959 break; 960 default: 961 error = ENODEV; 962 } 963 964 return(error); 965 } 966 967 static device_method_t lpt_methods[] = { 968 /* device interface */ 969 DEVMETHOD(device_identify, lpt_identify), 970 DEVMETHOD(device_probe, lpt_probe), 971 DEVMETHOD(device_attach, lpt_attach), 972 973 { 0, 0 } 974 }; 975 976 static driver_t lpt_driver = { 977 LPT_NAME, 978 lpt_methods, 979 sizeof(struct lpt_data), 980 }; 981 982 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 983