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 * $FreeBSD$ 52 */ 53 54 /* 55 * Device Driver for AT parallel printer port 56 * Written by William Jolitz 12/18/90 57 */ 58 59 /* 60 * Updated for ppbus by Nicolas Souchu 61 * [Mon Jul 28 1997] 62 */ 63 64 #include "opt_lpt.h" 65 66 #include <sys/param.h> 67 #include <sys/systm.h> 68 #include <sys/module.h> 69 #include <sys/bus.h> 70 #include <sys/conf.h> 71 #include <sys/kernel.h> 72 #include <sys/uio.h> 73 #include <sys/syslog.h> 74 #include <sys/malloc.h> 75 76 #include <machine/bus.h> 77 #include <machine/resource.h> 78 #include <sys/rman.h> 79 80 #include <dev/ppbus/lptio.h> 81 #include <dev/ppbus/ppbconf.h> 82 #include <dev/ppbus/ppb_1284.h> 83 #include <dev/ppbus/lpt.h> 84 #include "ppbus_if.h" 85 #include <dev/ppbus/ppbio.h> 86 87 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers"); 88 89 #ifndef LPT_DEBUG 90 #define lprintf(args) 91 #else 92 #define lprintf(args) \ 93 do { \ 94 if (lptflag) \ 95 printf args; \ 96 } while (0) 97 static int volatile lptflag = 1; 98 #endif 99 100 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 101 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 102 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 103 #define LPPRI (PZERO+8) 104 #define BUFSIZE 1024 105 #define BUFSTATSIZE 32 106 107 #define LPTUNIT(s) ((s)&0x03) 108 #define LPTFLAGS(s) ((s)&0xfc) 109 110 struct lpt_data { 111 112 short sc_state; 113 /* default case: negative prime, negative ack, handshake strobe, 114 prime once */ 115 u_char sc_control; 116 char sc_flags; 117 #define LP_POS_INIT 0x04 /* if we are a postive init signal */ 118 #define LP_POS_ACK 0x08 /* if we are a positive going ack */ 119 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 120 #define LP_PRIMEOPEN 0x20 /* prime on every open */ 121 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 122 #define LP_BYPASS 0x80 /* bypass printer ready checks */ 123 void *sc_inbuf; 124 void *sc_statbuf; 125 short sc_xfercnt ; 126 char sc_primed; 127 char *sc_cp ; 128 u_short sc_irq ; /* IRQ status of port */ 129 #define LP_HAS_IRQ 0x01 /* we have an irq available */ 130 #define LP_USE_IRQ 0x02 /* we are using our irq */ 131 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 132 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 133 u_char sc_backoff ; /* time to call lptout() again */ 134 135 struct resource *intr_resource; /* interrupt resource */ 136 void *intr_cookie; /* interrupt registration cookie */ 137 138 }; 139 140 #define LPT_NAME "lpt" /* our official name */ 141 142 static timeout_t lptout; 143 static int lpt_port_test(device_t dev, u_char data, u_char mask); 144 static int lpt_detect(device_t dev); 145 146 #define DEVTOSOFTC(dev) \ 147 ((struct lpt_data *)device_get_softc(dev)) 148 #define UNITOSOFTC(unit) \ 149 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit))) 150 #define UNITODEVICE(unit) \ 151 (devclass_get_device(lpt_devclass, (unit))) 152 153 static void lptintr(device_t dev); 154 static void lpt_intr(void *arg); /* without spls */ 155 156 static devclass_t lpt_devclass; 157 158 159 /* bits for state */ 160 #define OPEN (1<<0) /* device is open */ 161 #define ASLP (1<<1) /* awaiting draining of printer */ 162 #define EERROR (1<<2) /* error was received from printer */ 163 #define OBUSY (1<<3) /* printer is busy doing output */ 164 #define LPTOUT (1<<4) /* timeout while not selected */ 165 #define TOUT (1<<5) /* timeout while not selected */ 166 #define LPTINIT (1<<6) /* waiting to initialize for open */ 167 #define INTERRUPTED (1<<7) /* write call was interrupted */ 168 169 #define HAVEBUS (1<<8) /* the driver owns the bus */ 170 171 172 /* status masks to interrogate printer status */ 173 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 174 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 175 176 /* Printer Ready condition - from lpa.c */ 177 /* Only used in polling code */ 178 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 179 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 180 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 181 182 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 183 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 184 185 186 static d_open_t lptopen; 187 static d_close_t lptclose; 188 static d_write_t lptwrite; 189 static d_read_t lptread; 190 static d_ioctl_t lptioctl; 191 192 #define CDEV_MAJOR 16 193 static struct cdevsw lpt_cdevsw = { 194 /* open */ lptopen, 195 /* close */ lptclose, 196 /* read */ lptread, 197 /* write */ lptwrite, 198 /* ioctl */ lptioctl, 199 /* poll */ nopoll, 200 /* mmap */ nommap, 201 /* strategy */ nostrategy, 202 /* name */ LPT_NAME, 203 /* maj */ CDEV_MAJOR, 204 /* dump */ nodump, 205 /* psize */ nopsize, 206 /* flags */ 0, 207 /* bmaj */ -1 208 }; 209 210 static int 211 lpt_request_ppbus(device_t dev, int how) 212 { 213 device_t ppbus = device_get_parent(dev); 214 struct lpt_data *sc = DEVTOSOFTC(dev); 215 int error; 216 217 if (sc->sc_state & HAVEBUS) 218 return (0); 219 220 /* we have the bus only if the request succeded */ 221 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 222 sc->sc_state |= HAVEBUS; 223 224 return (error); 225 } 226 227 static int 228 lpt_release_ppbus(device_t dev) 229 { 230 device_t ppbus = device_get_parent(dev); 231 struct lpt_data *sc = DEVTOSOFTC(dev); 232 int error = 0; 233 234 if ((error = ppb_release_bus(ppbus, dev)) == 0) 235 sc->sc_state &= ~HAVEBUS; 236 237 return (error); 238 } 239 240 /* 241 * Internal routine to lptprobe to do port tests of one byte value 242 */ 243 static int 244 lpt_port_test(device_t ppbus, u_char data, u_char mask) 245 { 246 int temp, timeout; 247 248 data = data & mask; 249 ppb_wdtr(ppbus, data); 250 timeout = 10000; 251 do { 252 DELAY(10); 253 temp = ppb_rdtr(ppbus) & mask; 254 } 255 while (temp != data && --timeout); 256 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 257 return (temp == data); 258 } 259 260 /* 261 * Probe simplified by replacing multiple loops with a hardcoded 262 * test pattern - 1999/02/08 des@freebsd.org 263 * 264 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 265 * Based partially on Rod Grimes' printer probe 266 * 267 * Logic: 268 * 1) If no port address was given, use the bios detected ports 269 * and autodetect what ports the printers are on. 270 * 2) Otherwise, probe the data port at the address given, 271 * using the method in Rod Grimes' port probe. 272 * (Much code ripped off directly from Rod's probe.) 273 * 274 * Comments from Rod's probe: 275 * Logic: 276 * 1) You should be able to write to and read back the same value 277 * to the data port. Do an alternating zeros, alternating ones, 278 * walking zero, and walking one test to check for stuck bits. 279 * 280 * 2) You should be able to write to and read back the same value 281 * to the control port lower 5 bits, the upper 3 bits are reserved 282 * per the IBM PC technical reference manauls and different boards 283 * do different things with them. Do an alternating zeros, alternating 284 * ones, walking zero, and walking one test to check for stuck bits. 285 * 286 * Some printers drag the strobe line down when the are powered off 287 * so this bit has been masked out of the control port test. 288 * 289 * XXX Some printers may not like a fast pulse on init or strobe, I 290 * don't know at this point, if that becomes a problem these bits 291 * should be turned off in the mask byte for the control port test. 292 * 293 * We are finally left with a mask of 0x14, due to some printers 294 * being adamant about holding other bits high ........ 295 * 296 * Before probing the control port, we write a 0 to the data port - 297 * If not, some printers chuck out garbage when the strobe line 298 * gets toggled. 299 * 300 * 3) Set the data and control ports to a value of 0 301 * 302 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 303 * Epson FX-1170 and C.Itoh 8510RM 304 * printers. 305 * Quick exit on fail added. 306 */ 307 static int 308 lpt_detect(device_t dev) 309 { 310 device_t ppbus = device_get_parent(dev); 311 312 static u_char testbyte[18] = { 313 0x55, /* alternating zeros */ 314 0xaa, /* alternating ones */ 315 0xfe, 0xfd, 0xfb, 0xf7, 316 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 317 0x01, 0x02, 0x04, 0x08, 318 0x10, 0x20, 0x40, 0x80 /* walking one */ 319 }; 320 int i, error, status; 321 322 status = 1; /* assume success */ 323 324 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 325 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 326 status = 0; 327 goto end_probe; 328 } 329 330 for (i = 0; i < 18 && status; i++) 331 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 332 status = 0; 333 goto end_probe; 334 } 335 336 end_probe: 337 /* write 0's to control and data ports */ 338 ppb_wdtr(ppbus, 0); 339 ppb_wctr(ppbus, 0); 340 341 lpt_release_ppbus(dev); 342 343 return (status); 344 } 345 346 static void 347 lpt_identify(driver_t *driver, device_t parent) 348 { 349 350 BUS_ADD_CHILD(parent, 0, LPT_NAME, 0); 351 } 352 353 /* 354 * lpt_probe() 355 */ 356 static int 357 lpt_probe(device_t dev) 358 { 359 struct lpt_data *sc; 360 361 sc = DEVTOSOFTC(dev); 362 bzero(sc, sizeof(struct lpt_data)); 363 364 /* 365 * Now, try to detect the printer. 366 */ 367 if (!lpt_detect(dev)) 368 return (ENXIO); 369 370 device_set_desc(dev, "Printer"); 371 372 return (0); 373 } 374 375 static int 376 lpt_attach(device_t dev) 377 { 378 device_t ppbus = device_get_parent(dev); 379 struct lpt_data *sc = DEVTOSOFTC(dev); 380 int zero = 0, unit = device_get_unit(dev); 381 int error; 382 uintptr_t irq; 383 384 sc->sc_primed = 0; /* not primed yet */ 385 386 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 387 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 388 return (0); 389 } 390 391 ppb_wctr(ppbus, LPC_NINIT); 392 393 /* check if we can use interrupt, should be done by ppc stuff */ 394 lprintf(("oldirq %x\n", sc->sc_irq)); 395 396 /* retrieve the ppbus irq */ 397 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 398 399 if (irq > 0) { 400 /* declare our interrupt handler */ 401 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 402 &zero, irq, irq, 1, RF_SHAREABLE); 403 } 404 if (sc->intr_resource) { 405 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 406 device_printf(dev, "Interrupt-driven port\n"); 407 } else { 408 sc->sc_irq = 0; 409 device_printf(dev, "Polled port\n"); 410 } 411 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 412 413 lpt_release_ppbus(dev); 414 415 make_dev(&lpt_cdevsw, unit, 416 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 417 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 418 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 419 return (0); 420 } 421 422 static void 423 lptout(void *arg) 424 { 425 device_t dev = (device_t)arg; 426 struct lpt_data *sc = DEVTOSOFTC(dev); 427 #ifdef LPT_DEBUG 428 device_t ppbus = device_get_parent(dev); 429 #endif 430 431 lprintf(("T %x ", ppb_rstr(ppbus))); 432 if (sc->sc_state & OPEN) { 433 sc->sc_backoff++; 434 if (sc->sc_backoff > hz/LPTOUTMAX) 435 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 436 timeout(lptout, (caddr_t)dev, sc->sc_backoff); 437 } else 438 sc->sc_state &= ~TOUT; 439 440 if (sc->sc_state & EERROR) 441 sc->sc_state &= ~EERROR; 442 443 /* 444 * Avoid possible hangs due to missed interrupts 445 */ 446 if (sc->sc_xfercnt) { 447 lptintr(dev); 448 } else { 449 sc->sc_state &= ~OBUSY; 450 wakeup((caddr_t)dev); 451 } 452 } 453 454 /* 455 * lptopen -- reset the printer, then wait until it's selected and not busy. 456 * If LP_BYPASS flag is selected, then we do not try to select the 457 * printer -- this is just used for passing ioctls. 458 */ 459 460 static int 461 lptopen(dev_t dev, int flags, int fmt, struct proc *p) 462 { 463 int s; 464 int trys, err; 465 u_int unit = LPTUNIT(minor(dev)); 466 struct lpt_data *sc = UNITOSOFTC(unit); 467 device_t lptdev = UNITODEVICE(unit); 468 device_t ppbus = device_get_parent(lptdev); 469 470 if (!sc) 471 return (ENXIO); 472 473 if (sc->sc_state) { 474 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 475 return(EBUSY); 476 } else 477 sc->sc_state |= LPTINIT; 478 479 sc->sc_flags = LPTFLAGS(minor(dev)); 480 481 /* Check for open with BYPASS flag set. */ 482 if (sc->sc_flags & LP_BYPASS) { 483 sc->sc_state = OPEN; 484 return(0); 485 } 486 487 /* request the ppbus only if we don't have it already */ 488 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 489 /* give it a chance to try later */ 490 sc->sc_state = 0; 491 return (err); 492 } 493 494 s = spltty(); 495 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 496 497 /* set IRQ status according to ENABLE_IRQ flag 498 */ 499 if (sc->sc_irq & LP_ENABLE_IRQ) 500 sc->sc_irq |= LP_USE_IRQ; 501 else 502 sc->sc_irq &= ~LP_USE_IRQ; 503 504 /* init printer */ 505 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 506 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 507 ppb_wctr(ppbus, 0); 508 sc->sc_primed++; 509 DELAY(500); 510 } 511 } 512 513 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 514 515 /* wait till ready (printer running diagnostics) */ 516 trys = 0; 517 do { 518 /* ran out of waiting for the printer */ 519 if (trys++ >= LPINITRDY*4) { 520 splx(s); 521 sc->sc_state = 0; 522 lprintf(("status %x\n", ppb_rstr(ppbus))); 523 524 lpt_release_ppbus(lptdev); 525 return (EBUSY); 526 } 527 528 /* wait 1/4 second, give up if we get a signal */ 529 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, "lptinit", hz/4) != 530 EWOULDBLOCK) { 531 sc->sc_state = 0; 532 splx(s); 533 534 lpt_release_ppbus(lptdev); 535 return (EBUSY); 536 } 537 538 /* is printer online and ready for output */ 539 } while ((ppb_rstr(ppbus) & 540 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 541 (LPS_SEL|LPS_NBSY|LPS_NERR)); 542 543 sc->sc_control = LPC_SEL|LPC_NINIT; 544 if (sc->sc_flags & LP_AUTOLF) 545 sc->sc_control |= LPC_AUTOL; 546 547 /* enable interrupt if interrupt-driven */ 548 if (sc->sc_irq & LP_USE_IRQ) 549 sc->sc_control |= LPC_ENA; 550 551 ppb_wctr(ppbus, sc->sc_control); 552 553 sc->sc_state = OPEN; 554 sc->sc_inbuf = malloc(BUFSIZE, M_LPT, M_WAITOK); 555 sc->sc_statbuf = malloc(BUFSTATSIZE, M_LPT, M_WAITOK); 556 sc->sc_xfercnt = 0; 557 splx(s); 558 559 /* release the ppbus */ 560 lpt_release_ppbus(lptdev); 561 562 /* only use timeout if using interrupt */ 563 lprintf(("irq %x\n", sc->sc_irq)); 564 if (sc->sc_irq & LP_USE_IRQ) { 565 sc->sc_state |= TOUT; 566 timeout(lptout, (caddr_t)lptdev, 567 (sc->sc_backoff = hz/LPTOUTINITIAL)); 568 } 569 570 lprintf(("opened.\n")); 571 return(0); 572 } 573 574 /* 575 * lptclose -- close the device, free the local line buffer. 576 * 577 * Check for interrupted write call added. 578 */ 579 580 static int 581 lptclose(dev_t dev, int flags, int fmt, struct proc *p) 582 { 583 u_int unit = LPTUNIT(minor(dev)); 584 struct lpt_data *sc = UNITOSOFTC(unit); 585 device_t lptdev = UNITODEVICE(unit); 586 device_t ppbus = device_get_parent(lptdev); 587 int err; 588 589 if(sc->sc_flags & LP_BYPASS) 590 goto end_close; 591 592 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 593 return (err); 594 595 sc->sc_state &= ~OPEN; 596 597 /* if the last write was interrupted, don't complete it */ 598 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 599 while ((ppb_rstr(ppbus) & 600 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 601 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 602 /* wait 1/4 second, give up if we get a signal */ 603 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, 604 "lpclose", hz) != EWOULDBLOCK) 605 break; 606 607 ppb_wctr(ppbus, LPC_NINIT); 608 free(sc->sc_inbuf, M_LPT); 609 free(sc->sc_statbuf, M_LPT); 610 611 end_close: 612 /* release the bus anyway 613 * unregistration of interrupt forced by release 614 */ 615 lpt_release_ppbus(lptdev); 616 617 sc->sc_state = 0; 618 sc->sc_xfercnt = 0; 619 lprintf(("closed.\n")); 620 return(0); 621 } 622 623 /* 624 * lpt_pushbytes() 625 * Workhorse for actually spinning and writing bytes to printer 626 * Derived from lpa.c 627 * Originally by ? 628 * 629 * This code is only used when we are polling the port 630 */ 631 static int 632 lpt_pushbytes(device_t dev) 633 { 634 struct lpt_data *sc = DEVTOSOFTC(dev); 635 device_t ppbus = device_get_parent(dev); 636 int spin, err, tic; 637 char ch; 638 639 lprintf(("p")); 640 /* loop for every character .. */ 641 while (sc->sc_xfercnt > 0) { 642 /* printer data */ 643 ch = *(sc->sc_cp); 644 sc->sc_cp++; 645 sc->sc_xfercnt--; 646 647 /* 648 * Wait for printer ready. 649 * Loop 20 usecs testing BUSY bit, then sleep 650 * for exponentially increasing timeout. (vak) 651 */ 652 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 653 DELAY(1); /* XXX delay is NOT this accurate! */ 654 if (spin >= MAX_SPIN) { 655 tic = 0; 656 while (NOT_READY(ppbus)) { 657 /* 658 * Now sleep, every cycle a 659 * little longer .. 660 */ 661 tic = tic + tic + 1; 662 /* 663 * But no more than 10 seconds. (vak) 664 */ 665 if (tic > MAX_SLEEP) 666 tic = MAX_SLEEP; 667 err = tsleep((caddr_t)dev, LPPRI, 668 LPT_NAME "poll", tic); 669 if (err != EWOULDBLOCK) { 670 return (err); 671 } 672 } 673 } 674 675 /* output data */ 676 ppb_wdtr(ppbus, ch); 677 /* strobe */ 678 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 679 ppb_wctr(ppbus, sc->sc_control); 680 681 } 682 return(0); 683 } 684 685 /* 686 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 687 */ 688 689 static int 690 lptread(dev_t dev, struct uio *uio, int ioflag) 691 { 692 u_int unit = LPTUNIT(minor(dev)); 693 struct lpt_data *sc = UNITOSOFTC(unit); 694 device_t lptdev = UNITODEVICE(unit); 695 device_t ppbus = device_get_parent(lptdev); 696 int error = 0, len; 697 698 if (sc->sc_flags & LP_BYPASS) { 699 /* we can't do reads in bypass mode */ 700 return (EPERM); 701 } 702 703 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 704 return (error); 705 706 /* read data in an other buffer, read/write may be simultaneous */ 707 len = 0; 708 while (uio->uio_resid) { 709 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 710 sc->sc_statbuf, min(BUFSTATSIZE, 711 uio->uio_resid), &len))) { 712 goto error; 713 } 714 715 if (!len) 716 goto error; /* no more data */ 717 718 if ((error = uiomove(sc->sc_statbuf, len, uio))) 719 goto error; 720 } 721 722 error: 723 ppb_1284_terminate(ppbus); 724 return (error); 725 } 726 727 /* 728 * lptwrite --copy a line from user space to a local buffer, then call 729 * putc to get the chars moved to the output queue. 730 * 731 * Flagging of interrupted write added. 732 */ 733 734 static int 735 lptwrite(dev_t dev, struct uio *uio, int ioflag) 736 { 737 register 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 INTR_TYPE_TTY, lpt_intr, lptdev, 759 &sc->intr_cookie); 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 LPPRI|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 int s = spltty(); 895 896 lpt_intr(dev); 897 898 splx(s); 899 return; 900 } 901 902 static int 903 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 904 { 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 (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*)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 static device_method_t lpt_methods[] = { 963 /* device interface */ 964 DEVMETHOD(device_identify, lpt_identify), 965 DEVMETHOD(device_probe, lpt_probe), 966 DEVMETHOD(device_attach, lpt_attach), 967 968 { 0, 0 } 969 }; 970 971 static driver_t lpt_driver = { 972 LPT_NAME, 973 lpt_methods, 974 sizeof(struct lpt_data), 975 }; 976 977 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 978