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 #ifndef LPT_DEBUG 88 #define lprintf(args) 89 #else 90 #define lprintf(args) \ 91 do { \ 92 if (lptflag) \ 93 printf args; \ 94 } while (0) 95 static int volatile lptflag = 1; 96 #endif 97 98 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 99 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 100 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 101 #define LPPRI (PZERO+8) 102 #define BUFSIZE 1024 103 #define BUFSTATSIZE 32 104 105 #define LPTUNIT(s) ((s)&0x03) 106 #define LPTFLAGS(s) ((s)&0xfc) 107 108 struct lpt_data { 109 110 short sc_state; 111 /* default case: negative prime, negative ack, handshake strobe, 112 prime once */ 113 u_char sc_control; 114 char sc_flags; 115 #define LP_POS_INIT 0x04 /* if we are a postive init signal */ 116 #define LP_POS_ACK 0x08 /* if we are a positive going ack */ 117 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 118 #define LP_PRIMEOPEN 0x20 /* prime on every open */ 119 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 120 #define LP_BYPASS 0x80 /* bypass printer ready checks */ 121 void *sc_inbuf; 122 void *sc_statbuf; 123 short sc_xfercnt ; 124 char sc_primed; 125 char *sc_cp ; 126 u_short sc_irq ; /* IRQ status of port */ 127 #define LP_HAS_IRQ 0x01 /* we have an irq available */ 128 #define LP_USE_IRQ 0x02 /* we are using our irq */ 129 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 130 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 131 u_char sc_backoff ; /* time to call lptout() again */ 132 133 struct resource *intr_resource; /* interrupt resource */ 134 void *intr_cookie; /* interrupt registration cookie */ 135 136 }; 137 138 #define LPT_NAME "lpt" /* our official name */ 139 140 static timeout_t lptout; 141 static int lpt_port_test(device_t dev, u_char data, u_char mask); 142 static int lpt_detect(device_t dev); 143 144 #define DEVTOSOFTC(dev) \ 145 ((struct lpt_data *)device_get_softc(dev)) 146 #define UNITOSOFTC(unit) \ 147 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit))) 148 #define UNITODEVICE(unit) \ 149 (devclass_get_device(lpt_devclass, (unit))) 150 151 static void lptintr(device_t dev); 152 static void lpt_intr(void *arg); /* without spls */ 153 154 static devclass_t lpt_devclass; 155 156 157 /* bits for state */ 158 #define OPEN (1<<0) /* device is open */ 159 #define ASLP (1<<1) /* awaiting draining of printer */ 160 #define EERROR (1<<2) /* error was received from printer */ 161 #define OBUSY (1<<3) /* printer is busy doing output */ 162 #define LPTOUT (1<<4) /* timeout while not selected */ 163 #define TOUT (1<<5) /* timeout while not selected */ 164 #define LPTINIT (1<<6) /* waiting to initialize for open */ 165 #define INTERRUPTED (1<<7) /* write call was interrupted */ 166 167 #define HAVEBUS (1<<8) /* the driver owns the bus */ 168 169 170 /* status masks to interrogate printer status */ 171 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 172 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 173 174 /* Printer Ready condition - from lpa.c */ 175 /* Only used in polling code */ 176 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 177 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 178 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 179 180 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 181 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 182 183 184 static d_open_t lptopen; 185 static d_close_t lptclose; 186 static d_write_t lptwrite; 187 static d_read_t lptread; 188 static d_ioctl_t lptioctl; 189 190 #define CDEV_MAJOR 16 191 static struct cdevsw lpt_cdevsw = { 192 /* open */ lptopen, 193 /* close */ lptclose, 194 /* read */ lptread, 195 /* write */ lptwrite, 196 /* ioctl */ lptioctl, 197 /* poll */ nopoll, 198 /* mmap */ nommap, 199 /* strategy */ nostrategy, 200 /* name */ LPT_NAME, 201 /* maj */ CDEV_MAJOR, 202 /* dump */ nodump, 203 /* psize */ nopsize, 204 /* flags */ 0, 205 /* bmaj */ -1 206 }; 207 208 static int 209 lpt_request_ppbus(device_t dev, int how) 210 { 211 device_t ppbus = device_get_parent(dev); 212 struct lpt_data *sc = DEVTOSOFTC(dev); 213 int error; 214 215 if (sc->sc_state & HAVEBUS) 216 return (0); 217 218 /* we have the bus only if the request succeded */ 219 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 220 sc->sc_state |= HAVEBUS; 221 222 return (error); 223 } 224 225 static int 226 lpt_release_ppbus(device_t dev) 227 { 228 device_t ppbus = device_get_parent(dev); 229 struct lpt_data *sc = DEVTOSOFTC(dev); 230 int error = 0; 231 232 if ((error = ppb_release_bus(ppbus, dev)) == 0) 233 sc->sc_state &= ~HAVEBUS; 234 235 return (error); 236 } 237 238 /* 239 * Internal routine to lptprobe to do port tests of one byte value 240 */ 241 static int 242 lpt_port_test(device_t ppbus, u_char data, u_char mask) 243 { 244 int temp, timeout; 245 246 data = data & mask; 247 ppb_wdtr(ppbus, data); 248 timeout = 10000; 249 do { 250 DELAY(10); 251 temp = ppb_rdtr(ppbus) & mask; 252 } 253 while (temp != data && --timeout); 254 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 255 return (temp == data); 256 } 257 258 /* 259 * Probe simplified by replacing multiple loops with a hardcoded 260 * test pattern - 1999/02/08 des@freebsd.org 261 * 262 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 263 * Based partially on Rod Grimes' printer probe 264 * 265 * Logic: 266 * 1) If no port address was given, use the bios detected ports 267 * and autodetect what ports the printers are on. 268 * 2) Otherwise, probe the data port at the address given, 269 * using the method in Rod Grimes' port probe. 270 * (Much code ripped off directly from Rod's probe.) 271 * 272 * Comments from Rod's probe: 273 * Logic: 274 * 1) You should be able to write to and read back the same value 275 * to the data port. Do an alternating zeros, alternating ones, 276 * walking zero, and walking one test to check for stuck bits. 277 * 278 * 2) You should be able to write to and read back the same value 279 * to the control port lower 5 bits, the upper 3 bits are reserved 280 * per the IBM PC technical reference manauls and different boards 281 * do different things with them. Do an alternating zeros, alternating 282 * ones, walking zero, and walking one test to check for stuck bits. 283 * 284 * Some printers drag the strobe line down when the are powered off 285 * so this bit has been masked out of the control port test. 286 * 287 * XXX Some printers may not like a fast pulse on init or strobe, I 288 * don't know at this point, if that becomes a problem these bits 289 * should be turned off in the mask byte for the control port test. 290 * 291 * We are finally left with a mask of 0x14, due to some printers 292 * being adamant about holding other bits high ........ 293 * 294 * Before probing the control port, we write a 0 to the data port - 295 * If not, some printers chuck out garbage when the strobe line 296 * gets toggled. 297 * 298 * 3) Set the data and control ports to a value of 0 299 * 300 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 301 * Epson FX-1170 and C.Itoh 8510RM 302 * printers. 303 * Quick exit on fail added. 304 */ 305 static int 306 lpt_detect(device_t dev) 307 { 308 device_t ppbus = device_get_parent(dev); 309 310 static u_char testbyte[18] = { 311 0x55, /* alternating zeros */ 312 0xaa, /* alternating ones */ 313 0xfe, 0xfd, 0xfb, 0xf7, 314 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 315 0x01, 0x02, 0x04, 0x08, 316 0x10, 0x20, 0x40, 0x80 /* walking one */ 317 }; 318 int i, error, status; 319 320 status = 1; /* assume success */ 321 322 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 323 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 324 status = 0; 325 goto end_probe; 326 } 327 328 for (i = 0; i < 18 && status; i++) 329 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 330 status = 0; 331 goto end_probe; 332 } 333 334 end_probe: 335 /* write 0's to control and data ports */ 336 ppb_wdtr(ppbus, 0); 337 ppb_wctr(ppbus, 0); 338 339 lpt_release_ppbus(dev); 340 341 return (status); 342 } 343 344 static void 345 lpt_identify(driver_t *driver, device_t parent) 346 { 347 348 BUS_ADD_CHILD(parent, 0, LPT_NAME, 0); 349 } 350 351 /* 352 * lpt_probe() 353 */ 354 static int 355 lpt_probe(device_t dev) 356 { 357 struct lpt_data *sc; 358 359 sc = DEVTOSOFTC(dev); 360 bzero(sc, sizeof(struct lpt_data)); 361 362 /* 363 * Now, try to detect the printer. 364 */ 365 if (!lpt_detect(dev)) 366 return (ENXIO); 367 368 device_set_desc(dev, "Printer"); 369 370 return (0); 371 } 372 373 static int 374 lpt_attach(device_t dev) 375 { 376 device_t ppbus = device_get_parent(dev); 377 struct lpt_data *sc = DEVTOSOFTC(dev); 378 int zero = 0, unit = device_get_unit(dev); 379 int error; 380 uintptr_t irq; 381 382 sc->sc_primed = 0; /* not primed yet */ 383 384 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 385 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 386 return (0); 387 } 388 389 ppb_wctr(ppbus, LPC_NINIT); 390 391 /* check if we can use interrupt, should be done by ppc stuff */ 392 lprintf(("oldirq %x\n", sc->sc_irq)); 393 394 /* retrieve the ppbus irq */ 395 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 396 397 if (irq > 0) { 398 /* declare our interrupt handler */ 399 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 400 &zero, irq, irq, 1, RF_SHAREABLE); 401 } 402 if (sc->intr_resource) { 403 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 404 device_printf(dev, "Interrupt-driven port\n"); 405 } else { 406 sc->sc_irq = 0; 407 device_printf(dev, "Polled port\n"); 408 } 409 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 410 411 lpt_release_ppbus(dev); 412 413 make_dev(&lpt_cdevsw, unit, 414 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 415 make_dev(&lpt_cdevsw, unit | LP_BYPASS, 416 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 417 return (0); 418 } 419 420 static void 421 lptout(void *arg) 422 { 423 device_t dev = (device_t)arg; 424 struct lpt_data *sc = DEVTOSOFTC(dev); 425 #ifdef LPT_DEBUG 426 device_t ppbus = device_get_parent(dev); 427 #endif 428 429 lprintf(("T %x ", ppb_rstr(ppbus))); 430 if (sc->sc_state & OPEN) { 431 sc->sc_backoff++; 432 if (sc->sc_backoff > hz/LPTOUTMAX) 433 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 434 timeout(lptout, (caddr_t)dev, sc->sc_backoff); 435 } else 436 sc->sc_state &= ~TOUT; 437 438 if (sc->sc_state & EERROR) 439 sc->sc_state &= ~EERROR; 440 441 /* 442 * Avoid possible hangs due to missed interrupts 443 */ 444 if (sc->sc_xfercnt) { 445 lptintr(dev); 446 } else { 447 sc->sc_state &= ~OBUSY; 448 wakeup((caddr_t)dev); 449 } 450 } 451 452 /* 453 * lptopen -- reset the printer, then wait until it's selected and not busy. 454 * If LP_BYPASS flag is selected, then we do not try to select the 455 * printer -- this is just used for passing ioctls. 456 */ 457 458 static int 459 lptopen(dev_t dev, int flags, int fmt, struct proc *p) 460 { 461 int s; 462 int trys, err; 463 u_int unit = LPTUNIT(minor(dev)); 464 struct lpt_data *sc = UNITOSOFTC(unit); 465 device_t lptdev = UNITODEVICE(unit); 466 device_t ppbus = device_get_parent(lptdev); 467 468 if (!sc) 469 return (ENXIO); 470 471 if (sc->sc_state) { 472 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 473 return(EBUSY); 474 } else 475 sc->sc_state |= LPTINIT; 476 477 sc->sc_flags = LPTFLAGS(minor(dev)); 478 479 /* Check for open with BYPASS flag set. */ 480 if (sc->sc_flags & LP_BYPASS) { 481 sc->sc_state = OPEN; 482 return(0); 483 } 484 485 /* request the ppbus only if we don't have it already */ 486 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 487 /* give it a chance to try later */ 488 sc->sc_state = 0; 489 return (err); 490 } 491 492 s = spltty(); 493 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 494 495 /* set IRQ status according to ENABLE_IRQ flag 496 */ 497 if (sc->sc_irq & LP_ENABLE_IRQ) 498 sc->sc_irq |= LP_USE_IRQ; 499 else 500 sc->sc_irq &= ~LP_USE_IRQ; 501 502 /* init printer */ 503 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 504 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 505 ppb_wctr(ppbus, 0); 506 sc->sc_primed++; 507 DELAY(500); 508 } 509 } 510 511 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 512 513 /* wait till ready (printer running diagnostics) */ 514 trys = 0; 515 do { 516 /* ran out of waiting for the printer */ 517 if (trys++ >= LPINITRDY*4) { 518 splx(s); 519 sc->sc_state = 0; 520 lprintf(("status %x\n", ppb_rstr(ppbus))); 521 522 lpt_release_ppbus(lptdev); 523 return (EBUSY); 524 } 525 526 /* wait 1/4 second, give up if we get a signal */ 527 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, "lptinit", hz/4) != 528 EWOULDBLOCK) { 529 sc->sc_state = 0; 530 splx(s); 531 532 lpt_release_ppbus(lptdev); 533 return (EBUSY); 534 } 535 536 /* is printer online and ready for output */ 537 } while ((ppb_rstr(ppbus) & 538 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 539 (LPS_SEL|LPS_NBSY|LPS_NERR)); 540 541 sc->sc_control = LPC_SEL|LPC_NINIT; 542 if (sc->sc_flags & LP_AUTOLF) 543 sc->sc_control |= LPC_AUTOL; 544 545 /* enable interrupt if interrupt-driven */ 546 if (sc->sc_irq & LP_USE_IRQ) 547 sc->sc_control |= LPC_ENA; 548 549 ppb_wctr(ppbus, sc->sc_control); 550 551 sc->sc_state = OPEN; 552 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 553 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK); 554 sc->sc_xfercnt = 0; 555 splx(s); 556 557 /* release the ppbus */ 558 lpt_release_ppbus(lptdev); 559 560 /* only use timeout if using interrupt */ 561 lprintf(("irq %x\n", sc->sc_irq)); 562 if (sc->sc_irq & LP_USE_IRQ) { 563 sc->sc_state |= TOUT; 564 timeout(lptout, (caddr_t)lptdev, 565 (sc->sc_backoff = hz/LPTOUTINITIAL)); 566 } 567 568 lprintf(("opened.\n")); 569 return(0); 570 } 571 572 /* 573 * lptclose -- close the device, free the local line buffer. 574 * 575 * Check for interrupted write call added. 576 */ 577 578 static int 579 lptclose(dev_t dev, int flags, int fmt, struct proc *p) 580 { 581 u_int unit = LPTUNIT(minor(dev)); 582 struct lpt_data *sc = UNITOSOFTC(unit); 583 device_t lptdev = UNITODEVICE(unit); 584 device_t ppbus = device_get_parent(lptdev); 585 int err; 586 587 if(sc->sc_flags & LP_BYPASS) 588 goto end_close; 589 590 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 591 return (err); 592 593 sc->sc_state &= ~OPEN; 594 595 /* if the last write was interrupted, don't complete it */ 596 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 597 while ((ppb_rstr(ppbus) & 598 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 599 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 600 /* wait 1/4 second, give up if we get a signal */ 601 if (tsleep((caddr_t)lptdev, LPPRI|PCATCH, 602 "lpclose", hz) != EWOULDBLOCK) 603 break; 604 605 ppb_wctr(ppbus, LPC_NINIT); 606 free(sc->sc_inbuf, M_DEVBUF); 607 free(sc->sc_statbuf, M_DEVBUF); 608 609 end_close: 610 /* release the bus anyway 611 * unregistration of interrupt forced by release 612 */ 613 lpt_release_ppbus(lptdev); 614 615 sc->sc_state = 0; 616 sc->sc_xfercnt = 0; 617 lprintf(("closed.\n")); 618 return(0); 619 } 620 621 /* 622 * lpt_pushbytes() 623 * Workhorse for actually spinning and writing bytes to printer 624 * Derived from lpa.c 625 * Originally by ? 626 * 627 * This code is only used when we are polling the port 628 */ 629 static int 630 lpt_pushbytes(device_t dev) 631 { 632 struct lpt_data *sc = DEVTOSOFTC(dev); 633 device_t ppbus = device_get_parent(dev); 634 int spin, err, tic; 635 char ch; 636 637 lprintf(("p")); 638 /* loop for every character .. */ 639 while (sc->sc_xfercnt > 0) { 640 /* printer data */ 641 ch = *(sc->sc_cp); 642 sc->sc_cp++; 643 sc->sc_xfercnt--; 644 645 /* 646 * Wait for printer ready. 647 * Loop 20 usecs testing BUSY bit, then sleep 648 * for exponentially increasing timeout. (vak) 649 */ 650 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 651 DELAY(1); /* XXX delay is NOT this accurate! */ 652 if (spin >= MAX_SPIN) { 653 tic = 0; 654 while (NOT_READY(ppbus)) { 655 /* 656 * Now sleep, every cycle a 657 * little longer .. 658 */ 659 tic = tic + tic + 1; 660 /* 661 * But no more than 10 seconds. (vak) 662 */ 663 if (tic > MAX_SLEEP) 664 tic = MAX_SLEEP; 665 err = tsleep((caddr_t)dev, LPPRI, 666 LPT_NAME "poll", tic); 667 if (err != EWOULDBLOCK) { 668 return (err); 669 } 670 } 671 } 672 673 /* output data */ 674 ppb_wdtr(ppbus, ch); 675 /* strobe */ 676 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 677 ppb_wctr(ppbus, sc->sc_control); 678 679 } 680 return(0); 681 } 682 683 /* 684 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 685 */ 686 687 static int 688 lptread(dev_t dev, struct uio *uio, int ioflag) 689 { 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(dev_t dev, struct uio *uio, int ioflag) 734 { 735 register unsigned n; 736 int err; 737 u_int unit = LPTUNIT(minor(dev)); 738 struct lpt_data *sc = UNITOSOFTC(unit); 739 device_t lptdev = UNITODEVICE(unit); 740 device_t ppbus = device_get_parent(lptdev); 741 742 if(sc->sc_flags & LP_BYPASS) { 743 /* we can't do writes in bypass mode */ 744 return(EPERM); 745 } 746 747 /* request the ppbus only if we don't have it already */ 748 /* XXX interrupt registration?! */ 749 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 750 return (err); 751 752 /* if interrupts are working, register the handler */ 753 if (sc->sc_irq & LP_USE_IRQ) { 754 /* register our interrupt handler */ 755 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 756 INTR_TYPE_TTY, lpt_intr, lptdev, 757 &sc->intr_cookie); 758 if (err) { 759 device_printf(lptdev, "handler registration failed, polled mode.\n"); 760 sc->sc_irq &= ~LP_USE_IRQ; 761 } 762 } 763 764 sc->sc_state &= ~INTERRUPTED; 765 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 766 sc->sc_cp = sc->sc_inbuf; 767 uiomove(sc->sc_cp, n, uio); 768 sc->sc_xfercnt = n ; 769 770 if (sc->sc_irq & LP_ENABLE_EXT) { 771 /* try any extended mode */ 772 err = ppb_write(ppbus, sc->sc_cp, 773 sc->sc_xfercnt, 0); 774 switch (err) { 775 case 0: 776 /* if not all data was sent, we could rely 777 * on polling for the last bytes */ 778 sc->sc_xfercnt = 0; 779 break; 780 case EINTR: 781 sc->sc_state |= INTERRUPTED; 782 return(err); 783 case EINVAL: 784 /* advanced mode not avail */ 785 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 786 break; 787 default: 788 return(err); 789 } 790 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 791 lprintf(("i")); 792 /* if the printer is ready for a char, */ 793 /* give it one */ 794 if ((sc->sc_state & OBUSY) == 0){ 795 lprintf(("\nC %d. ", sc->sc_xfercnt)); 796 lptintr(lptdev); 797 } 798 lprintf(("W ")); 799 if (sc->sc_state & OBUSY) 800 if ((err = tsleep((caddr_t)lptdev, 801 LPPRI|PCATCH, LPT_NAME "write", 0))) { 802 sc->sc_state |= INTERRUPTED; 803 return(err); 804 } 805 } 806 807 /* check to see if we must do a polled write */ 808 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 809 lprintf(("p")); 810 811 err = lpt_pushbytes(lptdev); 812 813 if (err) 814 return(err); 815 } 816 } 817 818 /* we have not been interrupted, release the ppbus */ 819 lpt_release_ppbus(lptdev); 820 821 return(0); 822 } 823 824 /* 825 * lpt_intr -- handle printer interrupts which occur when the printer is 826 * ready to accept another char. 827 * 828 * do checking for interrupted write call. 829 */ 830 831 static void 832 lpt_intr(void *arg) 833 { 834 device_t lptdev = (device_t)arg; 835 device_t ppbus = device_get_parent(lptdev); 836 struct lpt_data *sc = DEVTOSOFTC(lptdev); 837 int sts = 0; 838 int i; 839 840 /* we must own the bus to use it */ 841 if ((sc->sc_state & HAVEBUS) == 0) 842 return; 843 844 /* 845 * Is printer online and ready for output? 846 * 847 * Avoid falling back to lptout() too quickly. First spin-loop 848 * to see if the printer will become ready ``really soon now''. 849 */ 850 for (i = 0; i < 100 && 851 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 852 853 if ((sts & RDY_MASK) == LP_READY) { 854 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 855 sc->sc_backoff = hz/LPTOUTINITIAL; 856 857 if (sc->sc_xfercnt) { 858 /* send char */ 859 /*lprintf(("%x ", *sc->sc_cp)); */ 860 ppb_wdtr(ppbus, *sc->sc_cp++) ; 861 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 862 /* DELAY(X) */ 863 ppb_wctr(ppbus, sc->sc_control); 864 865 /* any more data for printer */ 866 if(--(sc->sc_xfercnt) > 0) return; 867 } 868 869 /* 870 * No more data waiting for printer. 871 * Wakeup is not done if write call was not interrupted. 872 */ 873 sc->sc_state &= ~OBUSY; 874 875 if(!(sc->sc_state & INTERRUPTED)) 876 wakeup((caddr_t)lptdev); 877 lprintf(("w ")); 878 return; 879 } else { /* check for error */ 880 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 881 (sc->sc_state & OPEN)) 882 sc->sc_state |= EERROR; 883 /* lptout() will jump in and try to restart. */ 884 } 885 lprintf(("sts %x ", sts)); 886 } 887 888 static void 889 lptintr(device_t dev) 890 { 891 /* call the interrupt at required spl level */ 892 int s = spltty(); 893 894 lpt_intr(dev); 895 896 splx(s); 897 return; 898 } 899 900 static int 901 lptioctl(dev_t dev, u_long cmd, caddr_t data, int flags, struct proc *p) 902 { 903 int error = 0; 904 u_int unit = LPTUNIT(minor(dev)); 905 struct lpt_data *sc = UNITOSOFTC(unit); 906 u_char old_sc_irq; /* old printer IRQ status */ 907 908 switch (cmd) { 909 case LPT_IRQ : 910 if(sc->sc_irq & LP_HAS_IRQ) { 911 /* 912 * NOTE: 913 * If the IRQ status is changed, 914 * this will only be visible on the 915 * next open. 916 * 917 * If interrupt status changes, 918 * this gets syslog'd. 919 */ 920 old_sc_irq = sc->sc_irq; 921 switch(*(int*)data) { 922 case 0: 923 sc->sc_irq &= (~LP_ENABLE_IRQ); 924 break; 925 case 1: 926 sc->sc_irq &= (~LP_ENABLE_EXT); 927 sc->sc_irq |= LP_ENABLE_IRQ; 928 break; 929 case 2: 930 /* classic irq based transfer and advanced 931 * modes are in conflict 932 */ 933 sc->sc_irq &= (~LP_ENABLE_IRQ); 934 sc->sc_irq |= LP_ENABLE_EXT; 935 break; 936 case 3: 937 sc->sc_irq &= (~LP_ENABLE_EXT); 938 break; 939 default: 940 break; 941 } 942 943 if (old_sc_irq != sc->sc_irq ) 944 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 945 unit, 946 (sc->sc_irq & LP_ENABLE_IRQ)? 947 "interrupt-driven":"polled", 948 (sc->sc_irq & LP_ENABLE_EXT)? 949 "extended":"standard"); 950 } else /* polled port */ 951 error = EOPNOTSUPP; 952 break; 953 default: 954 error = ENODEV; 955 } 956 957 return(error); 958 } 959 960 static device_method_t lpt_methods[] = { 961 /* device interface */ 962 DEVMETHOD(device_identify, lpt_identify), 963 DEVMETHOD(device_probe, lpt_probe), 964 DEVMETHOD(device_attach, lpt_attach), 965 966 { 0, 0 } 967 }; 968 969 static driver_t lpt_driver = { 970 LPT_NAME, 971 lpt_methods, 972 sizeof(struct lpt_data), 973 }; 974 975 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 976