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 1.15 2006/07/28 02:17:36 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/device.h> 73 #include <sys/kernel.h> 74 #include <sys/uio.h> 75 #include <sys/syslog.h> 76 #include <sys/thread2.h> 77 #include <sys/malloc.h> 78 79 #include <machine/clock.h> 80 #include <machine/bus.h> 81 #include <machine/resource.h> 82 #include <sys/rman.h> 83 84 #include "lptio.h" 85 #include <bus/ppbus/ppbconf.h> 86 #include <bus/ppbus/ppb_1284.h> 87 #include "lpt.h" 88 #include "ppbus_if.h" 89 #include <bus/ppbus/ppbio.h> 90 91 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers"); 92 93 #ifndef LPT_DEBUG 94 #define lprintf(args) 95 #else 96 #define lprintf(args) \ 97 do { \ 98 if (lptflag) \ 99 printf args; \ 100 } while (0) 101 static int volatile lptflag = 1; 102 #endif 103 104 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 105 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 106 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 107 #define BUFSIZE 1024 108 #define BUFSTATSIZE 32 109 110 #define LPTUNIT(s) ((s)&0x03) 111 #define LPTFLAGS(s) ((s)&0xfc) 112 113 struct lpt_data { 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_UNITMASK 0x03 /* up to 4 units */ 120 #define LP_POS_INIT 0x04 /* if we are a postive init signal */ 121 #define LP_POS_ACK 0x08 /* if we are a positive going ack */ 122 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 123 #define LP_PRIMEOPEN 0x20 /* prime on every open */ 124 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 125 #define LP_BYPASS 0x80 /* bypass printer ready checks */ 126 void *sc_inbuf; 127 void *sc_statbuf; 128 short sc_xfercnt ; 129 char sc_primed; 130 char *sc_cp ; 131 u_short sc_irq ; /* IRQ status of port */ 132 #define LP_HAS_IRQ 0x01 /* we have an irq available */ 133 #define LP_USE_IRQ 0x02 /* we are using our irq */ 134 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 135 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 136 u_char sc_backoff ; /* time to call lptout() again */ 137 138 struct resource *intr_resource; /* interrupt resource */ 139 void *intr_cookie; /* interrupt registration cookie */ 140 struct callout sc_callout; 141 }; 142 143 #define LPT_NAME "lpt" /* our official name */ 144 145 static timeout_t lptout; 146 static int lpt_port_test(device_t dev, u_char data, u_char mask); 147 static int lpt_detect(device_t dev); 148 149 #define DEVTOSOFTC(dev) \ 150 ((struct lpt_data *)device_get_softc(dev)) 151 #define UNITOSOFTC(unit) \ 152 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit))) 153 #define UNITODEVICE(unit) \ 154 (devclass_get_device(lpt_devclass, (unit))) 155 156 static void lptintr(device_t dev); 157 static void lpt_intr(void *arg); /* without spls */ 158 159 static devclass_t lpt_devclass; 160 161 162 /* bits for state */ 163 #define OPEN (1<<0) /* device is open */ 164 #define ASLP (1<<1) /* awaiting draining of printer */ 165 #define EERROR (1<<2) /* error was received from printer */ 166 #define OBUSY (1<<3) /* printer is busy doing output */ 167 #define LPTOUT (1<<4) /* timeout while not selected */ 168 #define TOUT (1<<5) /* timeout while not selected */ 169 #define LPTINIT (1<<6) /* waiting to initialize for open */ 170 #define INTERRUPTED (1<<7) /* write call was interrupted */ 171 172 #define HAVEBUS (1<<8) /* the driver owns the bus */ 173 174 175 /* status masks to interrogate printer status */ 176 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 177 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 178 179 /* Printer Ready condition - from lpa.c */ 180 /* Only used in polling code */ 181 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 182 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 183 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 184 185 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 186 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 187 188 189 static d_open_t lptopen; 190 static d_close_t lptclose; 191 static d_write_t lptwrite; 192 static d_read_t lptread; 193 static d_ioctl_t lptioctl; 194 195 #define CDEV_MAJOR 16 196 static struct dev_ops lpt_ops = { 197 { LPT_NAME, CDEV_MAJOR, 0 }, 198 .d_open = lptopen, 199 .d_close = lptclose, 200 .d_read = lptread, 201 .d_write = lptwrite, 202 .d_ioctl = lptioctl, 203 }; 204 205 static int 206 lpt_request_ppbus(device_t dev, int how) 207 { 208 device_t ppbus = device_get_parent(dev); 209 struct lpt_data *sc = DEVTOSOFTC(dev); 210 int error; 211 212 if (sc->sc_state & HAVEBUS) 213 return (0); 214 215 /* we have the bus only if the request succeded */ 216 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 217 sc->sc_state |= HAVEBUS; 218 219 return (error); 220 } 221 222 static int 223 lpt_release_ppbus(device_t dev) 224 { 225 device_t ppbus = device_get_parent(dev); 226 struct lpt_data *sc = DEVTOSOFTC(dev); 227 int error = 0; 228 229 if ((error = ppb_release_bus(ppbus, dev)) == 0) 230 sc->sc_state &= ~HAVEBUS; 231 232 return (error); 233 } 234 235 /* 236 * Internal routine to lptprobe to do port tests of one byte value 237 */ 238 static int 239 lpt_port_test(device_t ppbus, u_char data, u_char mask) 240 { 241 int temp, timeout; 242 243 data = data & mask; 244 ppb_wdtr(ppbus, data); 245 timeout = 10000; 246 do { 247 DELAY(10); 248 temp = ppb_rdtr(ppbus) & mask; 249 } 250 while (temp != data && --timeout); 251 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 252 return (temp == data); 253 } 254 255 /* 256 * Probe simplified by replacing multiple loops with a hardcoded 257 * test pattern - 1999/02/08 des@freebsd.org 258 * 259 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 260 * Based partially on Rod Grimes' printer probe 261 * 262 * Logic: 263 * 1) If no port address was given, use the bios detected ports 264 * and autodetect what ports the printers are on. 265 * 2) Otherwise, probe the data port at the address given, 266 * using the method in Rod Grimes' port probe. 267 * (Much code ripped off directly from Rod's probe.) 268 * 269 * Comments from Rod's probe: 270 * Logic: 271 * 1) You should be able to write to and read back the same value 272 * to the data port. Do an alternating zeros, alternating ones, 273 * walking zero, and walking one test to check for stuck bits. 274 * 275 * 2) You should be able to write to and read back the same value 276 * to the control port lower 5 bits, the upper 3 bits are reserved 277 * per the IBM PC technical reference manauls and different boards 278 * do different things with them. Do an alternating zeros, alternating 279 * ones, walking zero, and walking one test to check for stuck bits. 280 * 281 * Some printers drag the strobe line down when the are powered off 282 * so this bit has been masked out of the control port test. 283 * 284 * XXX Some printers may not like a fast pulse on init or strobe, I 285 * don't know at this point, if that becomes a problem these bits 286 * should be turned off in the mask byte for the control port test. 287 * 288 * We are finally left with a mask of 0x14, due to some printers 289 * being adamant about holding other bits high ........ 290 * 291 * Before probing the control port, we write a 0 to the data port - 292 * If not, some printers chuck out garbage when the strobe line 293 * gets toggled. 294 * 295 * 3) Set the data and control ports to a value of 0 296 * 297 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 298 * Epson FX-1170 and C.Itoh 8510RM 299 * printers. 300 * Quick exit on fail added. 301 */ 302 static int 303 lpt_detect(device_t dev) 304 { 305 device_t ppbus = device_get_parent(dev); 306 307 static u_char testbyte[18] = { 308 0x55, /* alternating zeros */ 309 0xaa, /* alternating ones */ 310 0xfe, 0xfd, 0xfb, 0xf7, 311 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 312 0x01, 0x02, 0x04, 0x08, 313 0x10, 0x20, 0x40, 0x80 /* walking one */ 314 }; 315 int i, error, status; 316 317 status = 1; /* assume success */ 318 319 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 320 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 321 status = 0; 322 goto end_probe; 323 } 324 325 for (i = 0; i < 18 && status; i++) 326 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 327 status = 0; 328 goto end_probe; 329 } 330 331 end_probe: 332 /* write 0's to control and data ports */ 333 ppb_wdtr(ppbus, 0); 334 ppb_wctr(ppbus, 0); 335 336 lpt_release_ppbus(dev); 337 338 return (status); 339 } 340 341 /* 342 * lpt_probe() 343 */ 344 static int 345 lpt_probe(device_t dev) 346 { 347 struct lpt_data *sc; 348 349 sc = DEVTOSOFTC(dev); 350 bzero(sc, sizeof(struct lpt_data)); 351 352 /* 353 * Now, try to detect the printer. 354 */ 355 if (!lpt_detect(dev)) 356 return (ENXIO); 357 358 device_set_desc(dev, "Printer"); 359 360 return (0); 361 } 362 363 static int 364 lpt_attach(device_t dev) 365 { 366 device_t ppbus = device_get_parent(dev); 367 struct lpt_data *sc = DEVTOSOFTC(dev); 368 int zero = 0, unit = device_get_unit(dev); 369 int error; 370 uintptr_t irq; 371 372 sc->sc_primed = 0; /* not primed yet */ 373 callout_init(&sc->sc_callout); 374 375 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 376 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 377 return (0); 378 } 379 380 ppb_wctr(ppbus, LPC_NINIT); 381 382 /* check if we can use interrupt, should be done by ppc stuff */ 383 lprintf(("oldirq %x\n", sc->sc_irq)); 384 385 /* retrieve the ppbus irq */ 386 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 387 388 if (irq > 0) { 389 /* declare our interrupt handler */ 390 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 391 &zero, irq, irq, 1, RF_SHAREABLE); 392 } 393 if (sc->intr_resource) { 394 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 395 device_printf(dev, "Interrupt-driven port\n"); 396 } else { 397 sc->sc_irq = 0; 398 device_printf(dev, "Polled port\n"); 399 } 400 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 401 402 lpt_release_ppbus(dev); 403 404 dev_ops_add(&lpt_ops, LP_UNITMASK, unit); 405 make_dev(&lpt_ops, unit, 406 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 407 make_dev(&lpt_ops, unit | LP_BYPASS, 408 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 409 return (0); 410 } 411 412 static void 413 lptout(void *arg) 414 { 415 device_t dev = (device_t)arg; 416 struct lpt_data *sc = DEVTOSOFTC(dev); 417 #ifdef LPT_DEBUG 418 device_t ppbus = device_get_parent(dev); 419 #endif 420 421 lprintf(("T %x ", ppb_rstr(ppbus))); 422 if (sc->sc_state & OPEN) { 423 sc->sc_backoff++; 424 if (sc->sc_backoff > hz/LPTOUTMAX) 425 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 426 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, dev); 427 } else { 428 sc->sc_state &= ~TOUT; 429 } 430 431 if (sc->sc_state & EERROR) 432 sc->sc_state &= ~EERROR; 433 434 /* 435 * Avoid possible hangs due to missed interrupts 436 */ 437 if (sc->sc_xfercnt) { 438 lptintr(dev); 439 } else { 440 sc->sc_state &= ~OBUSY; 441 wakeup((caddr_t)dev); 442 } 443 } 444 445 /* 446 * lptopen -- reset the printer, then wait until it's selected and not busy. 447 * If LP_BYPASS flag is selected, then we do not try to select the 448 * printer -- this is just used for passing ioctls. 449 */ 450 451 static int 452 lptopen(struct dev_open_args *ap) 453 { 454 dev_t dev = ap->a_head.a_dev; 455 int trys, err; 456 u_int unit = LPTUNIT(minor(dev)); 457 struct lpt_data *sc = UNITOSOFTC(unit); 458 device_t lptdev = UNITODEVICE(unit); 459 device_t ppbus = device_get_parent(lptdev); 460 461 if (!sc) 462 return (ENXIO); 463 464 if (sc->sc_state) { 465 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 466 return(EBUSY); 467 } else 468 sc->sc_state |= LPTINIT; 469 470 sc->sc_flags = LPTFLAGS(minor(dev)); 471 472 /* Check for open with BYPASS flag set. */ 473 if (sc->sc_flags & LP_BYPASS) { 474 sc->sc_state = OPEN; 475 return(0); 476 } 477 478 /* request the ppbus only if we don't have it already */ 479 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 480 /* give it a chance to try later */ 481 sc->sc_state = 0; 482 return (err); 483 } 484 485 crit_enter(); 486 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 487 488 /* set IRQ status according to ENABLE_IRQ flag 489 */ 490 if (sc->sc_irq & LP_ENABLE_IRQ) 491 sc->sc_irq |= LP_USE_IRQ; 492 else 493 sc->sc_irq &= ~LP_USE_IRQ; 494 495 /* init printer */ 496 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 497 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 498 ppb_wctr(ppbus, 0); 499 sc->sc_primed++; 500 DELAY(500); 501 } 502 } 503 504 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 505 506 /* wait till ready (printer running diagnostics) */ 507 trys = 0; 508 do { 509 /* ran out of waiting for the printer */ 510 if (trys++ >= LPINITRDY*4) { 511 crit_exit(); 512 sc->sc_state = 0; 513 lprintf(("status %x\n", ppb_rstr(ppbus))); 514 515 lpt_release_ppbus(lptdev); 516 return (EBUSY); 517 } 518 519 /* wait 1/4 second, give up if we get a signal */ 520 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) != 521 EWOULDBLOCK) { 522 sc->sc_state = 0; 523 crit_exit(); 524 525 lpt_release_ppbus(lptdev); 526 return (EBUSY); 527 } 528 529 /* is printer online and ready for output */ 530 } while ((ppb_rstr(ppbus) & 531 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 532 (LPS_SEL|LPS_NBSY|LPS_NERR)); 533 534 sc->sc_control = LPC_SEL|LPC_NINIT; 535 if (sc->sc_flags & LP_AUTOLF) 536 sc->sc_control |= LPC_AUTOL; 537 538 /* enable interrupt if interrupt-driven */ 539 if (sc->sc_irq & LP_USE_IRQ) 540 sc->sc_control |= LPC_ENA; 541 542 ppb_wctr(ppbus, sc->sc_control); 543 544 sc->sc_state = OPEN; 545 sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK); 546 sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK); 547 sc->sc_xfercnt = 0; 548 549 crit_exit(); 550 551 /* release the ppbus */ 552 lpt_release_ppbus(lptdev); 553 554 /* only use timeout if using interrupt */ 555 lprintf(("irq %x\n", sc->sc_irq)); 556 if (sc->sc_irq & LP_USE_IRQ) { 557 sc->sc_state |= TOUT; 558 sc->sc_backoff = hz / LPTOUTINITIAL; 559 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, lptdev); 560 } 561 562 lprintf(("opened.\n")); 563 return(0); 564 } 565 566 /* 567 * lptclose -- close the device, free the local line buffer. 568 * 569 * Check for interrupted write call added. 570 */ 571 572 static int 573 lptclose(struct dev_close_args *ap) 574 { 575 dev_t dev = ap->a_head.a_dev; 576 u_int unit = LPTUNIT(minor(dev)); 577 struct lpt_data *sc = UNITOSOFTC(unit); 578 device_t lptdev = UNITODEVICE(unit); 579 device_t ppbus = device_get_parent(lptdev); 580 int err; 581 582 if(sc->sc_flags & LP_BYPASS) 583 goto end_close; 584 585 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 586 return (err); 587 588 sc->sc_state &= ~OPEN; 589 590 /* if the last write was interrupted, don't complete it */ 591 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) { 592 while ((ppb_rstr(ppbus) & 593 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 594 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) { 595 /* wait 1/4 second, give up if we get a signal */ 596 if (tsleep((caddr_t)lptdev, PCATCH, 597 "lpclose", hz) != EWOULDBLOCK) { 598 break; 599 } 600 } 601 } 602 callout_stop(&sc->sc_callout); 603 ppb_wctr(ppbus, LPC_NINIT); 604 free(sc->sc_inbuf, M_LPT); 605 free(sc->sc_statbuf, M_LPT); 606 607 end_close: 608 /* release the bus anyway 609 * unregistration of interrupt forced by release 610 */ 611 lpt_release_ppbus(lptdev); 612 613 sc->sc_state = 0; 614 sc->sc_xfercnt = 0; 615 lprintf(("closed.\n")); 616 return(0); 617 } 618 619 /* 620 * lpt_pushbytes() 621 * Workhorse for actually spinning and writing bytes to printer 622 * Derived from lpa.c 623 * Originally by ? 624 * 625 * This code is only used when we are polling the port 626 */ 627 static int 628 lpt_pushbytes(device_t dev) 629 { 630 struct lpt_data *sc = DEVTOSOFTC(dev); 631 device_t ppbus = device_get_parent(dev); 632 int spin, err, tic; 633 char ch; 634 635 lprintf(("p")); 636 /* loop for every character .. */ 637 while (sc->sc_xfercnt > 0) { 638 /* printer data */ 639 ch = *(sc->sc_cp); 640 sc->sc_cp++; 641 sc->sc_xfercnt--; 642 643 /* 644 * Wait for printer ready. 645 * Loop 20 usecs testing BUSY bit, then sleep 646 * for exponentially increasing timeout. (vak) 647 */ 648 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 649 DELAY(1); /* XXX delay is NOT this accurate! */ 650 if (spin >= MAX_SPIN) { 651 tic = 0; 652 while (NOT_READY(ppbus)) { 653 /* 654 * Now sleep, every cycle a 655 * little longer .. 656 */ 657 tic = tic + tic + 1; 658 /* 659 * But no more than 10 seconds. (vak) 660 */ 661 if (tic > MAX_SLEEP) 662 tic = MAX_SLEEP; 663 err = tsleep((caddr_t)dev, 0, 664 LPT_NAME "poll", tic); 665 if (err != EWOULDBLOCK) { 666 return (err); 667 } 668 } 669 } 670 671 /* output data */ 672 ppb_wdtr(ppbus, ch); 673 /* strobe */ 674 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 675 ppb_wctr(ppbus, sc->sc_control); 676 677 } 678 return(0); 679 } 680 681 /* 682 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 683 */ 684 685 static int 686 lptread(struct dev_read_args *ap) 687 { 688 dev_t dev = ap->a_head.a_dev; 689 struct uio *uio = ap->a_uio; 690 u_int unit = LPTUNIT(minor(dev)); 691 struct lpt_data *sc = UNITOSOFTC(unit); 692 device_t lptdev = UNITODEVICE(unit); 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 } 719 720 error: 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 */ 731 732 static int 733 lptwrite(struct dev_write_args *ap) 734 { 735 dev_t dev = ap->a_head.a_dev; 736 struct uio *uio = ap->a_uio; 737 unsigned n; 738 int err; 739 u_int unit = LPTUNIT(minor(dev)); 740 struct lpt_data *sc = UNITOSOFTC(unit); 741 device_t lptdev = UNITODEVICE(unit); 742 device_t ppbus = device_get_parent(lptdev); 743 744 if(sc->sc_flags & LP_BYPASS) { 745 /* we can't do writes in bypass mode */ 746 return(EPERM); 747 } 748 749 /* request the ppbus only if we don't have it already */ 750 /* XXX interrupt registration?! */ 751 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 752 return (err); 753 754 /* if interrupts are working, register the handler */ 755 if (sc->sc_irq & LP_USE_IRQ) { 756 /* register our interrupt handler */ 757 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 758 0, lpt_intr, lptdev, 759 &sc->intr_cookie, NULL); 760 if (err) { 761 device_printf(lptdev, "handler registration failed, polled mode.\n"); 762 sc->sc_irq &= ~LP_USE_IRQ; 763 } 764 } 765 766 sc->sc_state &= ~INTERRUPTED; 767 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 768 sc->sc_cp = sc->sc_inbuf; 769 uiomove(sc->sc_cp, n, uio); 770 sc->sc_xfercnt = n ; 771 772 if (sc->sc_irq & LP_ENABLE_EXT) { 773 /* try any extended mode */ 774 err = ppb_write(ppbus, sc->sc_cp, 775 sc->sc_xfercnt, 0); 776 switch (err) { 777 case 0: 778 /* if not all data was sent, we could rely 779 * on polling for the last bytes */ 780 sc->sc_xfercnt = 0; 781 break; 782 case EINTR: 783 sc->sc_state |= INTERRUPTED; 784 return(err); 785 case EINVAL: 786 /* advanced mode not avail */ 787 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 788 break; 789 default: 790 return(err); 791 } 792 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 793 lprintf(("i")); 794 /* if the printer is ready for a char, */ 795 /* give it one */ 796 if ((sc->sc_state & OBUSY) == 0){ 797 lprintf(("\nC %d. ", sc->sc_xfercnt)); 798 lptintr(lptdev); 799 } 800 lprintf(("W ")); 801 if (sc->sc_state & OBUSY) 802 if ((err = tsleep((caddr_t)lptdev, 803 PCATCH, LPT_NAME "write", 0))) { 804 sc->sc_state |= INTERRUPTED; 805 return(err); 806 } 807 } 808 809 /* check to see if we must do a polled write */ 810 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 811 lprintf(("p")); 812 813 err = lpt_pushbytes(lptdev); 814 815 if (err) 816 return(err); 817 } 818 } 819 820 /* we have not been interrupted, release the ppbus */ 821 lpt_release_ppbus(lptdev); 822 823 return(0); 824 } 825 826 /* 827 * lpt_intr -- handle printer interrupts which occur when the printer is 828 * ready to accept another char. 829 * 830 * do checking for interrupted write call. 831 */ 832 833 static void 834 lpt_intr(void *arg) 835 { 836 device_t lptdev = (device_t)arg; 837 device_t ppbus = device_get_parent(lptdev); 838 struct lpt_data *sc = DEVTOSOFTC(lptdev); 839 int sts = 0; 840 int i; 841 842 /* we must own the bus to use it */ 843 if ((sc->sc_state & HAVEBUS) == 0) 844 return; 845 846 /* 847 * Is printer online and ready for output? 848 * 849 * Avoid falling back to lptout() too quickly. First spin-loop 850 * to see if the printer will become ready ``really soon now''. 851 */ 852 for (i = 0; i < 100 && 853 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 854 855 if ((sts & RDY_MASK) == LP_READY) { 856 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 857 sc->sc_backoff = hz/LPTOUTINITIAL; 858 859 if (sc->sc_xfercnt) { 860 /* send char */ 861 /*lprintf(("%x ", *sc->sc_cp)); */ 862 ppb_wdtr(ppbus, *sc->sc_cp++) ; 863 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 864 /* DELAY(X) */ 865 ppb_wctr(ppbus, sc->sc_control); 866 867 /* any more data for printer */ 868 if(--(sc->sc_xfercnt) > 0) return; 869 } 870 871 /* 872 * No more data waiting for printer. 873 * Wakeup is not done if write call was not interrupted. 874 */ 875 sc->sc_state &= ~OBUSY; 876 877 if(!(sc->sc_state & INTERRUPTED)) 878 wakeup((caddr_t)lptdev); 879 lprintf(("w ")); 880 return; 881 } else { /* check for error */ 882 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 883 (sc->sc_state & OPEN)) 884 sc->sc_state |= EERROR; 885 /* lptout() will jump in and try to restart. */ 886 } 887 lprintf(("sts %x ", sts)); 888 } 889 890 static void 891 lptintr(device_t dev) 892 { 893 /* call the interrupt at required spl level */ 894 crit_enter(); 895 896 lpt_intr(dev); 897 898 crit_exit(); 899 } 900 901 static int 902 lptioctl(struct dev_ioctl_args *ap) 903 { 904 dev_t dev = ap->a_head.a_dev; 905 int error = 0; 906 u_int unit = LPTUNIT(minor(dev)); 907 struct lpt_data *sc = UNITOSOFTC(unit); 908 u_char old_sc_irq; /* old printer IRQ status */ 909 910 switch (ap->a_cmd) { 911 case LPT_IRQ : 912 if(sc->sc_irq & LP_HAS_IRQ) { 913 /* 914 * NOTE: 915 * If the IRQ status is changed, 916 * this will only be visible on the 917 * next open. 918 * 919 * If interrupt status changes, 920 * this gets syslog'd. 921 */ 922 old_sc_irq = sc->sc_irq; 923 switch(*(int*)ap->a_data) { 924 case 0: 925 sc->sc_irq &= (~LP_ENABLE_IRQ); 926 break; 927 case 1: 928 sc->sc_irq &= (~LP_ENABLE_EXT); 929 sc->sc_irq |= LP_ENABLE_IRQ; 930 break; 931 case 2: 932 /* classic irq based transfer and advanced 933 * modes are in conflict 934 */ 935 sc->sc_irq &= (~LP_ENABLE_IRQ); 936 sc->sc_irq |= LP_ENABLE_EXT; 937 break; 938 case 3: 939 sc->sc_irq &= (~LP_ENABLE_EXT); 940 break; 941 default: 942 break; 943 } 944 945 if (old_sc_irq != sc->sc_irq ) 946 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 947 unit, 948 (sc->sc_irq & LP_ENABLE_IRQ)? 949 "interrupt-driven":"polled", 950 (sc->sc_irq & LP_ENABLE_EXT)? 951 "extended":"standard"); 952 } else /* polled port */ 953 error = EOPNOTSUPP; 954 break; 955 default: 956 error = ENODEV; 957 } 958 959 return(error); 960 } 961 962 /* 963 * Because lpt is a static device that always exists under a ppbus device, 964 * and not scanned by the ppbus device, we need an identify function to 965 * install its device. 966 */ 967 static device_method_t lpt_methods[] = { 968 /* device interface */ 969 DEVMETHOD(device_identify, bus_generic_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); 983 984