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 1.2 2003/06/17 04:28:29 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 <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 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 LPPRI (PZERO+8) 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 { 113 114 short sc_state; 115 /* default case: negative prime, negative ack, handshake strobe, 116 prime once */ 117 u_char sc_control; 118 char sc_flags; 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 /* open */ lptopen, 197 /* close */ lptclose, 198 /* read */ lptread, 199 /* write */ lptwrite, 200 /* ioctl */ lptioctl, 201 /* poll */ nopoll, 202 /* mmap */ nommap, 203 /* strategy */ nostrategy, 204 /* name */ LPT_NAME, 205 /* maj */ CDEV_MAJOR, 206 /* dump */ nodump, 207 /* psize */ nopsize, 208 /* flags */ 0, 209 /* bmaj */ -1 210 }; 211 212 static int 213 lpt_request_ppbus(device_t dev, int how) 214 { 215 device_t ppbus = device_get_parent(dev); 216 struct lpt_data *sc = DEVTOSOFTC(dev); 217 int error; 218 219 if (sc->sc_state & HAVEBUS) 220 return (0); 221 222 /* we have the bus only if the request succeded */ 223 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 224 sc->sc_state |= HAVEBUS; 225 226 return (error); 227 } 228 229 static int 230 lpt_release_ppbus(device_t dev) 231 { 232 device_t ppbus = device_get_parent(dev); 233 struct lpt_data *sc = DEVTOSOFTC(dev); 234 int error = 0; 235 236 if ((error = ppb_release_bus(ppbus, dev)) == 0) 237 sc->sc_state &= ~HAVEBUS; 238 239 return (error); 240 } 241 242 /* 243 * Internal routine to lptprobe to do port tests of one byte value 244 */ 245 static int 246 lpt_port_test(device_t ppbus, u_char data, u_char mask) 247 { 248 int temp, timeout; 249 250 data = data & mask; 251 ppb_wdtr(ppbus, data); 252 timeout = 10000; 253 do { 254 DELAY(10); 255 temp = ppb_rdtr(ppbus) & mask; 256 } 257 while (temp != data && --timeout); 258 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 259 return (temp == data); 260 } 261 262 /* 263 * Probe simplified by replacing multiple loops with a hardcoded 264 * test pattern - 1999/02/08 des@freebsd.org 265 * 266 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 267 * Based partially on Rod Grimes' printer probe 268 * 269 * Logic: 270 * 1) If no port address was given, use the bios detected ports 271 * and autodetect what ports the printers are on. 272 * 2) Otherwise, probe the data port at the address given, 273 * using the method in Rod Grimes' port probe. 274 * (Much code ripped off directly from Rod's probe.) 275 * 276 * Comments from Rod's probe: 277 * Logic: 278 * 1) You should be able to write to and read back the same value 279 * to the data port. Do an alternating zeros, alternating ones, 280 * walking zero, and walking one test to check for stuck bits. 281 * 282 * 2) You should be able to write to and read back the same value 283 * to the control port lower 5 bits, the upper 3 bits are reserved 284 * per the IBM PC technical reference manauls and different boards 285 * do different things with them. Do an alternating zeros, alternating 286 * ones, walking zero, and walking one test to check for stuck bits. 287 * 288 * Some printers drag the strobe line down when the are powered off 289 * so this bit has been masked out of the control port test. 290 * 291 * XXX Some printers may not like a fast pulse on init or strobe, I 292 * don't know at this point, if that becomes a problem these bits 293 * should be turned off in the mask byte for the control port test. 294 * 295 * We are finally left with a mask of 0x14, due to some printers 296 * being adamant about holding other bits high ........ 297 * 298 * Before probing the control port, we write a 0 to the data port - 299 * If not, some printers chuck out garbage when the strobe line 300 * gets toggled. 301 * 302 * 3) Set the data and control ports to a value of 0 303 * 304 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 305 * Epson FX-1170 and C.Itoh 8510RM 306 * printers. 307 * Quick exit on fail added. 308 */ 309 static int 310 lpt_detect(device_t dev) 311 { 312 device_t ppbus = device_get_parent(dev); 313 314 static u_char testbyte[18] = { 315 0x55, /* alternating zeros */ 316 0xaa, /* alternating ones */ 317 0xfe, 0xfd, 0xfb, 0xf7, 318 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 319 0x01, 0x02, 0x04, 0x08, 320 0x10, 0x20, 0x40, 0x80 /* walking one */ 321 }; 322 int i, error, status; 323 324 status = 1; /* assume success */ 325 326 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 327 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 328 status = 0; 329 goto end_probe; 330 } 331 332 for (i = 0; i < 18 && status; i++) 333 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 334 status = 0; 335 goto end_probe; 336 } 337 338 end_probe: 339 /* write 0's to control and data ports */ 340 ppb_wdtr(ppbus, 0); 341 ppb_wctr(ppbus, 0); 342 343 lpt_release_ppbus(dev); 344 345 return (status); 346 } 347 348 static void 349 lpt_identify(driver_t *driver, device_t parent) 350 { 351 352 BUS_ADD_CHILD(parent, 0, LPT_NAME, 0); 353 } 354 355 /* 356 * lpt_probe() 357 */ 358 static int 359 lpt_probe(device_t dev) 360 { 361 struct lpt_data *sc; 362 363 sc = DEVTOSOFTC(dev); 364 bzero(sc, sizeof(struct lpt_data)); 365 366 /* 367 * Now, try to detect the printer. 368 */ 369 if (!lpt_detect(dev)) 370 return (ENXIO); 371 372 device_set_desc(dev, "Printer"); 373 374 return (0); 375 } 376 377 static int 378 lpt_attach(device_t dev) 379 { 380 device_t ppbus = device_get_parent(dev); 381 struct lpt_data *sc = DEVTOSOFTC(dev); 382 int zero = 0, unit = device_get_unit(dev); 383 int error; 384 uintptr_t irq; 385 386 sc->sc_primed = 0; /* not primed yet */ 387 388 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 389 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 390 return (0); 391 } 392 393 ppb_wctr(ppbus, LPC_NINIT); 394 395 /* check if we can use interrupt, should be done by ppc stuff */ 396 lprintf(("oldirq %x\n", sc->sc_irq)); 397 398 /* retrieve the ppbus irq */ 399 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 400 401 if (irq > 0) { 402 /* declare our interrupt handler */ 403 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 404 &zero, irq, irq, 1, RF_SHAREABLE); 405 } 406 if (sc->intr_resource) { 407 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 408 device_printf(dev, "Interrupt-driven port\n"); 409 } else { 410 sc->sc_irq = 0; 411 device_printf(dev, "Polled port\n"); 412 } 413 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 414 415 lpt_release_ppbus(dev); 416 417 make_dev(&lpt_cdevsw, unit, 418 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 419 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 420 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 421 return (0); 422 } 423 424 static void 425 lptout(void *arg) 426 { 427 device_t dev = (device_t)arg; 428 struct lpt_data *sc = DEVTOSOFTC(dev); 429 #ifdef LPT_DEBUG 430 device_t ppbus = device_get_parent(dev); 431 #endif 432 433 lprintf(("T %x ", ppb_rstr(ppbus))); 434 if (sc->sc_state & OPEN) { 435 sc->sc_backoff++; 436 if (sc->sc_backoff > hz/LPTOUTMAX) 437 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 438 timeout(lptout, (caddr_t)dev, sc->sc_backoff); 439 } else 440 sc->sc_state &= ~TOUT; 441 442 if (sc->sc_state & EERROR) 443 sc->sc_state &= ~EERROR; 444 445 /* 446 * Avoid possible hangs due to missed interrupts 447 */ 448 if (sc->sc_xfercnt) { 449 lptintr(dev); 450 } else { 451 sc->sc_state &= ~OBUSY; 452 wakeup((caddr_t)dev); 453 } 454 } 455 456 /* 457 * lptopen -- reset the printer, then wait until it's selected and not busy. 458 * If LP_BYPASS flag is selected, then we do not try to select the 459 * printer -- this is just used for passing ioctls. 460 */ 461 462 static int 463 lptopen(dev_t dev, int flags, int fmt, struct proc *p) 464 { 465 int s; 466 int trys, err; 467 u_int unit = LPTUNIT(minor(dev)); 468 struct lpt_data *sc = UNITOSOFTC(unit); 469 device_t lptdev = UNITODEVICE(unit); 470 device_t ppbus = device_get_parent(lptdev); 471 472 if (!sc) 473 return (ENXIO); 474 475 if (sc->sc_state) { 476 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 477 return(EBUSY); 478 } else 479 sc->sc_state |= LPTINIT; 480 481 sc->sc_flags = LPTFLAGS(minor(dev)); 482 483 /* Check for open with BYPASS flag set. */ 484 if (sc->sc_flags & LP_BYPASS) { 485 sc->sc_state = OPEN; 486 return(0); 487 } 488 489 /* request the ppbus only if we don't have it already */ 490 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 491 /* give it a chance to try later */ 492 sc->sc_state = 0; 493 return (err); 494 } 495 496 s = spltty(); 497 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 498 499 /* set IRQ status according to ENABLE_IRQ flag 500 */ 501 if (sc->sc_irq & LP_ENABLE_IRQ) 502 sc->sc_irq |= LP_USE_IRQ; 503 else 504 sc->sc_irq &= ~LP_USE_IRQ; 505 506 /* init printer */ 507 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 508 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 509 ppb_wctr(ppbus, 0); 510 sc->sc_primed++; 511 DELAY(500); 512 } 513 } 514 515 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 516 517 /* wait till ready (printer running diagnostics) */ 518 trys = 0; 519 do { 520 /* ran out of waiting for the printer */ 521 if (trys++ >= LPINITRDY*4) { 522 splx(s); 523 sc->sc_state = 0; 524 lprintf(("status %x\n", ppb_rstr(ppbus))); 525 526 lpt_release_ppbus(lptdev); 527 return (EBUSY); 528 } 529 530 /* wait 1/4 second, give up if we get a signal */ 531 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, "lptinit", hz/4) != 532 EWOULDBLOCK) { 533 sc->sc_state = 0; 534 splx(s); 535 536 lpt_release_ppbus(lptdev); 537 return (EBUSY); 538 } 539 540 /* is printer online and ready for output */ 541 } while ((ppb_rstr(ppbus) & 542 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 543 (LPS_SEL|LPS_NBSY|LPS_NERR)); 544 545 sc->sc_control = LPC_SEL|LPC_NINIT; 546 if (sc->sc_flags & LP_AUTOLF) 547 sc->sc_control |= LPC_AUTOL; 548 549 /* enable interrupt if interrupt-driven */ 550 if (sc->sc_irq & LP_USE_IRQ) 551 sc->sc_control |= LPC_ENA; 552 553 ppb_wctr(ppbus, sc->sc_control); 554 555 sc->sc_state = OPEN; 556 sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK); 557 sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK); 558 sc->sc_xfercnt = 0; 559 splx(s); 560 561 /* release the ppbus */ 562 lpt_release_ppbus(lptdev); 563 564 /* only use timeout if using interrupt */ 565 lprintf(("irq %x\n", sc->sc_irq)); 566 if (sc->sc_irq & LP_USE_IRQ) { 567 sc->sc_state |= TOUT; 568 timeout(lptout, (caddr_t)lptdev, 569 (sc->sc_backoff = hz/LPTOUTINITIAL)); 570 } 571 572 lprintf(("opened.\n")); 573 return(0); 574 } 575 576 /* 577 * lptclose -- close the device, free the local line buffer. 578 * 579 * Check for interrupted write call added. 580 */ 581 582 static int 583 lptclose(dev_t dev, int flags, int fmt, struct proc *p) 584 { 585 u_int unit = LPTUNIT(minor(dev)); 586 struct lpt_data *sc = UNITOSOFTC(unit); 587 device_t lptdev = UNITODEVICE(unit); 588 device_t ppbus = device_get_parent(lptdev); 589 int err; 590 591 if(sc->sc_flags & LP_BYPASS) 592 goto end_close; 593 594 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 595 return (err); 596 597 sc->sc_state &= ~OPEN; 598 599 /* if the last write was interrupted, don't complete it */ 600 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 601 while ((ppb_rstr(ppbus) & 602 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 603 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 604 /* wait 1/4 second, give up if we get a signal */ 605 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, 606 "lpclose", hz) != EWOULDBLOCK) 607 break; 608 609 ppb_wctr(ppbus, LPC_NINIT); 610 free(sc->sc_inbuf, M_LPT); 611 free(sc->sc_statbuf, M_LPT); 612 613 end_close: 614 /* release the bus anyway 615 * unregistration of interrupt forced by release 616 */ 617 lpt_release_ppbus(lptdev); 618 619 sc->sc_state = 0; 620 sc->sc_xfercnt = 0; 621 lprintf(("closed.\n")); 622 return(0); 623 } 624 625 /* 626 * lpt_pushbytes() 627 * Workhorse for actually spinning and writing bytes to printer 628 * Derived from lpa.c 629 * Originally by ? 630 * 631 * This code is only used when we are polling the port 632 */ 633 static int 634 lpt_pushbytes(device_t dev) 635 { 636 struct lpt_data *sc = DEVTOSOFTC(dev); 637 device_t ppbus = device_get_parent(dev); 638 int spin, err, tic; 639 char ch; 640 641 lprintf(("p")); 642 /* loop for every character .. */ 643 while (sc->sc_xfercnt > 0) { 644 /* printer data */ 645 ch = *(sc->sc_cp); 646 sc->sc_cp++; 647 sc->sc_xfercnt--; 648 649 /* 650 * Wait for printer ready. 651 * Loop 20 usecs testing BUSY bit, then sleep 652 * for exponentially increasing timeout. (vak) 653 */ 654 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 655 DELAY(1); /* XXX delay is NOT this accurate! */ 656 if (spin >= MAX_SPIN) { 657 tic = 0; 658 while (NOT_READY(ppbus)) { 659 /* 660 * Now sleep, every cycle a 661 * little longer .. 662 */ 663 tic = tic + tic + 1; 664 /* 665 * But no more than 10 seconds. (vak) 666 */ 667 if (tic > MAX_SLEEP) 668 tic = MAX_SLEEP; 669 err = tsleep((caddr_t)dev, LPPRI, 670 LPT_NAME "poll", tic); 671 if (err != EWOULDBLOCK) { 672 return (err); 673 } 674 } 675 } 676 677 /* output data */ 678 ppb_wdtr(ppbus, ch); 679 /* strobe */ 680 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 681 ppb_wctr(ppbus, sc->sc_control); 682 683 } 684 return(0); 685 } 686 687 /* 688 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 689 */ 690 691 static int 692 lptread(dev_t dev, struct uio *uio, int ioflag) 693 { 694 u_int unit = LPTUNIT(minor(dev)); 695 struct lpt_data *sc = UNITOSOFTC(unit); 696 device_t lptdev = UNITODEVICE(unit); 697 device_t ppbus = device_get_parent(lptdev); 698 int error = 0, len; 699 700 if (sc->sc_flags & LP_BYPASS) { 701 /* we can't do reads in bypass mode */ 702 return (EPERM); 703 } 704 705 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 706 return (error); 707 708 /* read data in an other buffer, read/write may be simultaneous */ 709 len = 0; 710 while (uio->uio_resid) { 711 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 712 sc->sc_statbuf, min(BUFSTATSIZE, 713 uio->uio_resid), &len))) { 714 goto error; 715 } 716 717 if (!len) 718 goto error; /* no more data */ 719 720 if ((error = uiomove(sc->sc_statbuf, len, uio))) 721 goto error; 722 } 723 724 error: 725 ppb_1284_terminate(ppbus); 726 return (error); 727 } 728 729 /* 730 * lptwrite --copy a line from user space to a local buffer, then call 731 * putc to get the chars moved to the output queue. 732 * 733 * Flagging of interrupted write added. 734 */ 735 736 static int 737 lptwrite(dev_t dev, struct uio *uio, int ioflag) 738 { 739 register unsigned n; 740 int err; 741 u_int unit = LPTUNIT(minor(dev)); 742 struct lpt_data *sc = UNITOSOFTC(unit); 743 device_t lptdev = UNITODEVICE(unit); 744 device_t ppbus = device_get_parent(lptdev); 745 746 if(sc->sc_flags & LP_BYPASS) { 747 /* we can't do writes in bypass mode */ 748 return(EPERM); 749 } 750 751 /* request the ppbus only if we don't have it already */ 752 /* XXX interrupt registration?! */ 753 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 754 return (err); 755 756 /* if interrupts are working, register the handler */ 757 if (sc->sc_irq & LP_USE_IRQ) { 758 /* register our interrupt handler */ 759 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 760 INTR_TYPE_TTY, lpt_intr, lptdev, 761 &sc->intr_cookie); 762 if (err) { 763 device_printf(lptdev, "handler registration failed, polled mode.\n"); 764 sc->sc_irq &= ~LP_USE_IRQ; 765 } 766 } 767 768 sc->sc_state &= ~INTERRUPTED; 769 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 770 sc->sc_cp = sc->sc_inbuf; 771 uiomove(sc->sc_cp, n, uio); 772 sc->sc_xfercnt = n ; 773 774 if (sc->sc_irq & LP_ENABLE_EXT) { 775 /* try any extended mode */ 776 err = ppb_write(ppbus, sc->sc_cp, 777 sc->sc_xfercnt, 0); 778 switch (err) { 779 case 0: 780 /* if not all data was sent, we could rely 781 * on polling for the last bytes */ 782 sc->sc_xfercnt = 0; 783 break; 784 case EINTR: 785 sc->sc_state |= INTERRUPTED; 786 return(err); 787 case EINVAL: 788 /* advanced mode not avail */ 789 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 790 break; 791 default: 792 return(err); 793 } 794 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 795 lprintf(("i")); 796 /* if the printer is ready for a char, */ 797 /* give it one */ 798 if ((sc->sc_state & OBUSY) == 0){ 799 lprintf(("\nC %d. ", sc->sc_xfercnt)); 800 lptintr(lptdev); 801 } 802 lprintf(("W ")); 803 if (sc->sc_state & OBUSY) 804 if ((err = tsleep((caddr_t)lptdev, 805 LPPRI|PCATCH, LPT_NAME "write", 0))) { 806 sc->sc_state |= INTERRUPTED; 807 return(err); 808 } 809 } 810 811 /* check to see if we must do a polled write */ 812 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 813 lprintf(("p")); 814 815 err = lpt_pushbytes(lptdev); 816 817 if (err) 818 return(err); 819 } 820 } 821 822 /* we have not been interrupted, release the ppbus */ 823 lpt_release_ppbus(lptdev); 824 825 return(0); 826 } 827 828 /* 829 * lpt_intr -- handle printer interrupts which occur when the printer is 830 * ready to accept another char. 831 * 832 * do checking for interrupted write call. 833 */ 834 835 static void 836 lpt_intr(void *arg) 837 { 838 device_t lptdev = (device_t)arg; 839 device_t ppbus = device_get_parent(lptdev); 840 struct lpt_data *sc = DEVTOSOFTC(lptdev); 841 int sts = 0; 842 int i; 843 844 /* we must own the bus to use it */ 845 if ((sc->sc_state & HAVEBUS) == 0) 846 return; 847 848 /* 849 * Is printer online and ready for output? 850 * 851 * Avoid falling back to lptout() too quickly. First spin-loop 852 * to see if the printer will become ready ``really soon now''. 853 */ 854 for (i = 0; i < 100 && 855 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 856 857 if ((sts & RDY_MASK) == LP_READY) { 858 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 859 sc->sc_backoff = hz/LPTOUTINITIAL; 860 861 if (sc->sc_xfercnt) { 862 /* send char */ 863 /*lprintf(("%x ", *sc->sc_cp)); */ 864 ppb_wdtr(ppbus, *sc->sc_cp++) ; 865 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 866 /* DELAY(X) */ 867 ppb_wctr(ppbus, sc->sc_control); 868 869 /* any more data for printer */ 870 if(--(sc->sc_xfercnt) > 0) return; 871 } 872 873 /* 874 * No more data waiting for printer. 875 * Wakeup is not done if write call was not interrupted. 876 */ 877 sc->sc_state &= ~OBUSY; 878 879 if(!(sc->sc_state & INTERRUPTED)) 880 wakeup((caddr_t)lptdev); 881 lprintf(("w ")); 882 return; 883 } else { /* check for error */ 884 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 885 (sc->sc_state & OPEN)) 886 sc->sc_state |= EERROR; 887 /* lptout() will jump in and try to restart. */ 888 } 889 lprintf(("sts %x ", sts)); 890 } 891 892 static void 893 lptintr(device_t dev) 894 { 895 /* call the interrupt at required spl level */ 896 int s = spltty(); 897 898 lpt_intr(dev); 899 900 splx(s); 901 return; 902 } 903 904 static int 905 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 906 { 907 int error = 0; 908 u_int unit = LPTUNIT(minor(dev)); 909 struct lpt_data *sc = UNITOSOFTC(unit); 910 u_char old_sc_irq; /* old printer IRQ status */ 911 912 switch (cmd) { 913 case LPT_IRQ : 914 if(sc->sc_irq & LP_HAS_IRQ) { 915 /* 916 * NOTE: 917 * If the IRQ status is changed, 918 * this will only be visible on the 919 * next open. 920 * 921 * If interrupt status changes, 922 * this gets syslog'd. 923 */ 924 old_sc_irq = sc->sc_irq; 925 switch(*(int*)data) { 926 case 0: 927 sc->sc_irq &= (~LP_ENABLE_IRQ); 928 break; 929 case 1: 930 sc->sc_irq &= (~LP_ENABLE_EXT); 931 sc->sc_irq |= LP_ENABLE_IRQ; 932 break; 933 case 2: 934 /* classic irq based transfer and advanced 935 * modes are in conflict 936 */ 937 sc->sc_irq &= (~LP_ENABLE_IRQ); 938 sc->sc_irq |= LP_ENABLE_EXT; 939 break; 940 case 3: 941 sc->sc_irq &= (~LP_ENABLE_EXT); 942 break; 943 default: 944 break; 945 } 946 947 if (old_sc_irq != sc->sc_irq ) 948 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 949 unit, 950 (sc->sc_irq & LP_ENABLE_IRQ)? 951 "interrupt-driven":"polled", 952 (sc->sc_irq & LP_ENABLE_EXT)? 953 "extended":"standard"); 954 } else /* polled port */ 955 error = EOPNOTSUPP; 956 break; 957 default: 958 error = ENODEV; 959 } 960 961 return(error); 962 } 963 964 static device_method_t lpt_methods[] = { 965 /* device interface */ 966 DEVMETHOD(device_identify, lpt_identify), 967 DEVMETHOD(device_probe, lpt_probe), 968 DEVMETHOD(device_attach, lpt_attach), 969 970 { 0, 0 } 971 }; 972 973 static driver_t lpt_driver = { 974 LPT_NAME, 975 lpt_methods, 976 sizeof(struct lpt_data), 977 }; 978 979 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 980