Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/misc/lpt/lpt.c
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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 */ 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/device.h> 72 #include <sys/kernel.h> 73 #include <sys/uio.h> 74 #include <sys/syslog.h> 75 #include <sys/thread2.h> 76 #include <sys/malloc.h> 77 #include <sys/rman.h> 78 79 #include <machine/clock.h> 80 #include <machine/inttypes.h> 81 82 #include "lptio.h" 83 #include <bus/ppbus/ppbconf.h> 84 #include <bus/ppbus/ppb_1284.h> 85 #include "lpt.h" 86 #include "ppbus_if.h" 87 #include <bus/ppbus/ppbio.h> 88 89 MALLOC_DEFINE(M_LPT, "lpt", "LPT buffers"); 90 91 #ifndef LPT_DEBUG 92 #define lprintf(args) 93 #else 94 #define lprintf(args) \ 95 do { \ 96 if (lptflag) \ 97 kprintf args; \ 98 } while (0) 99 static int volatile lptflag = 1; 100 #endif 101 102 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 103 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 104 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 105 #define BUFSIZE 1024 106 #define BUFSTATSIZE 32 107 108 #define LPTUNIT(s) ((s)&0x03) 109 #define LPTFLAGS(s) ((s)&0xfc) 110 111 struct lpt_data { 112 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_UNITMASK 0x03 /* up to 4 units */ 118 #define LP_POS_INIT 0x04 /* if we are a postive init signal */ 119 #define LP_POS_ACK 0x08 /* if we are a positive going ack */ 120 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 121 #define LP_PRIMEOPEN 0x20 /* prime on every open */ 122 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 123 #define LP_BYPASS 0x80 /* bypass printer ready checks */ 124 void *sc_inbuf; 125 void *sc_statbuf; 126 short sc_xfercnt ; 127 char sc_primed; 128 char *sc_cp ; 129 u_short sc_irq ; /* IRQ status of port */ 130 #define LP_HAS_IRQ 0x01 /* we have an irq available */ 131 #define LP_USE_IRQ 0x02 /* we are using our irq */ 132 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 133 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 134 u_char sc_backoff ; /* time to call lptout() again */ 135 136 struct resource *intr_resource; /* interrupt resource */ 137 void *intr_cookie; /* interrupt registration cookie */ 138 struct callout sc_callout; 139 }; 140 141 #define LPT_NAME "lpt" /* our official name */ 142 143 static timeout_t lptout; 144 static int lpt_port_test(device_t dev, u_char data, u_char mask); 145 static int lpt_detect(device_t dev); 146 147 #define DEVTOSOFTC(dev) \ 148 ((struct lpt_data *)device_get_softc(dev)) 149 #define UNITOSOFTC(unit) \ 150 ((struct lpt_data *)devclass_get_softc(lpt_devclass, (unit))) 151 #define UNITODEVICE(unit) \ 152 (devclass_get_device(lpt_devclass, (unit))) 153 154 static void lptintr(device_t dev); 155 static void lpt_intr(void *arg); /* without spls */ 156 157 static devclass_t lpt_devclass; 158 159 160 /* bits for state */ 161 #define OPEN (1<<0) /* device is open */ 162 #define ASLP (1<<1) /* awaiting draining of printer */ 163 #define EERROR (1<<2) /* error was received from printer */ 164 #define OBUSY (1<<3) /* printer is busy doing output */ 165 #define LPTOUT (1<<4) /* timeout while not selected */ 166 #define TOUT (1<<5) /* timeout while not selected */ 167 #define LPTINIT (1<<6) /* waiting to initialize for open */ 168 #define INTERRUPTED (1<<7) /* write call was interrupted */ 169 170 #define HAVEBUS (1<<8) /* the driver owns the bus */ 171 172 173 /* status masks to interrogate printer status */ 174 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 175 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 176 177 /* Printer Ready condition - from lpa.c */ 178 /* Only used in polling code */ 179 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 180 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 181 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 182 183 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 184 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 185 186 187 static d_open_t lptopen; 188 static d_close_t lptclose; 189 static d_write_t lptwrite; 190 static d_read_t lptread; 191 static d_ioctl_t lptioctl; 192 193 static struct dev_ops lpt_ops = { 194 { LPT_NAME, 0, 0 }, 195 .d_open = lptopen, 196 .d_close = lptclose, 197 .d_read = lptread, 198 .d_write = lptwrite, 199 .d_ioctl = lptioctl, 200 }; 201 202 static int 203 lpt_request_ppbus(device_t dev, int how) 204 { 205 device_t ppbus = device_get_parent(dev); 206 struct lpt_data *sc = DEVTOSOFTC(dev); 207 int error; 208 209 if (sc->sc_state & HAVEBUS) 210 return (0); 211 212 /* we have the bus only if the request succeded */ 213 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 214 sc->sc_state |= HAVEBUS; 215 216 return (error); 217 } 218 219 static int 220 lpt_release_ppbus(device_t dev) 221 { 222 device_t ppbus = device_get_parent(dev); 223 struct lpt_data *sc = DEVTOSOFTC(dev); 224 int error = 0; 225 226 if ((error = ppb_release_bus(ppbus, dev)) == 0) 227 sc->sc_state &= ~HAVEBUS; 228 229 return (error); 230 } 231 232 /* 233 * Internal routine to lptprobe to do port tests of one byte value 234 */ 235 static int 236 lpt_port_test(device_t ppbus, u_char data, u_char mask) 237 { 238 int temp, timeout; 239 240 data = data & mask; 241 ppb_wdtr(ppbus, data); 242 timeout = 10000; 243 do { 244 DELAY(10); 245 temp = ppb_rdtr(ppbus) & mask; 246 } 247 while (temp != data && --timeout); 248 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 249 return (temp == data); 250 } 251 252 /* 253 * Probe simplified by replacing multiple loops with a hardcoded 254 * test pattern - 1999/02/08 des@freebsd.org 255 * 256 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 257 * Based partially on Rod Grimes' printer probe 258 * 259 * Logic: 260 * 1) If no port address was given, use the bios detected ports 261 * and autodetect what ports the printers are on. 262 * 2) Otherwise, probe the data port at the address given, 263 * using the method in Rod Grimes' port probe. 264 * (Much code ripped off directly from Rod's probe.) 265 * 266 * Comments from Rod's probe: 267 * Logic: 268 * 1) You should be able to write to and read back the same value 269 * to the data port. Do an alternating zeros, alternating ones, 270 * walking zero, and walking one test to check for stuck bits. 271 * 272 * 2) You should be able to write to and read back the same value 273 * to the control port lower 5 bits, the upper 3 bits are reserved 274 * per the IBM PC technical reference manauls and different boards 275 * do different things with them. Do an alternating zeros, alternating 276 * ones, walking zero, and walking one test to check for stuck bits. 277 * 278 * Some printers drag the strobe line down when the are powered off 279 * so this bit has been masked out of the control port test. 280 * 281 * XXX Some printers may not like a fast pulse on init or strobe, I 282 * don't know at this point, if that becomes a problem these bits 283 * should be turned off in the mask byte for the control port test. 284 * 285 * We are finally left with a mask of 0x14, due to some printers 286 * being adamant about holding other bits high ........ 287 * 288 * Before probing the control port, we write a 0 to the data port - 289 * If not, some printers chuck out garbage when the strobe line 290 * gets toggled. 291 * 292 * 3) Set the data and control ports to a value of 0 293 * 294 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 295 * Epson FX-1170 and C.Itoh 8510RM 296 * printers. 297 * Quick exit on fail added. 298 */ 299 static int 300 lpt_detect(device_t dev) 301 { 302 device_t ppbus = device_get_parent(dev); 303 304 static u_char testbyte[18] = { 305 0x55, /* alternating zeros */ 306 0xaa, /* alternating ones */ 307 0xfe, 0xfd, 0xfb, 0xf7, 308 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 309 0x01, 0x02, 0x04, 0x08, 310 0x10, 0x20, 0x40, 0x80 /* walking one */ 311 }; 312 int i, error, status; 313 314 status = 1; /* assume success */ 315 316 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 317 kprintf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 318 status = 0; 319 goto end_probe; 320 } 321 322 for (i = 0; i < 18 && status; i++) 323 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 324 status = 0; 325 goto end_probe; 326 } 327 328 end_probe: 329 /* write 0's to control and data ports */ 330 ppb_wdtr(ppbus, 0); 331 ppb_wctr(ppbus, 0); 332 333 lpt_release_ppbus(dev); 334 335 return (status); 336 } 337 338 /* 339 * lpt_probe() 340 */ 341 static int 342 lpt_probe(device_t dev) 343 { 344 struct lpt_data *sc; 345 346 sc = DEVTOSOFTC(dev); 347 bzero(sc, sizeof(struct lpt_data)); 348 349 /* 350 * Now, try to detect the printer. 351 */ 352 if (!lpt_detect(dev)) 353 return (ENXIO); 354 355 device_set_desc(dev, "Printer"); 356 357 return (0); 358 } 359 360 static int 361 lpt_attach(device_t dev) 362 { 363 device_t ppbus = device_get_parent(dev); 364 struct lpt_data *sc = DEVTOSOFTC(dev); 365 int zero = 0, unit = device_get_unit(dev); 366 int error; 367 uintptr_t irq; 368 369 sc->sc_primed = 0; /* not primed yet */ 370 callout_init(&sc->sc_callout); 371 372 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 373 kprintf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 374 return (0); 375 } 376 377 ppb_wctr(ppbus, LPC_NINIT); 378 379 /* check if we can use interrupt, should be done by ppc stuff */ 380 lprintf(("oldirq %x\n", sc->sc_irq)); 381 382 /* retrieve the ppbus irq */ 383 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 384 385 if (irq > 0) { 386 /* declare our interrupt handler */ 387 sc->intr_resource = bus_alloc_legacy_irq_resource(dev, &zero, 388 irq, RF_SHAREABLE); 389 } 390 if (sc->intr_resource) { 391 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 392 device_printf(dev, "Interrupt-driven port\n"); 393 } else { 394 sc->sc_irq = 0; 395 device_printf(dev, "Polled port\n"); 396 } 397 lprintf(("irq %"PRIxPTR" %x\n", irq, sc->sc_irq)); 398 399 lpt_release_ppbus(dev); 400 401 make_dev(&lpt_ops, unit, UID_ROOT, GID_WHEEL, 402 0600, LPT_NAME "%d", unit); 403 make_dev(&lpt_ops, unit | LP_BYPASS, UID_ROOT, GID_WHEEL, 404 0600, LPT_NAME "%d.ctl", unit); 405 return (0); 406 } 407 408 static void 409 lptout(void *arg) 410 { 411 device_t dev = (device_t)arg; 412 struct lpt_data *sc = DEVTOSOFTC(dev); 413 #ifdef LPT_DEBUG 414 device_t ppbus = device_get_parent(dev); 415 #endif 416 417 lprintf(("T %x ", ppb_rstr(ppbus))); 418 if (sc->sc_state & OPEN) { 419 sc->sc_backoff++; 420 if (sc->sc_backoff > hz/LPTOUTMAX) 421 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 422 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, dev); 423 } else { 424 sc->sc_state &= ~TOUT; 425 } 426 427 if (sc->sc_state & EERROR) 428 sc->sc_state &= ~EERROR; 429 430 /* 431 * Avoid possible hangs due to missed interrupts 432 */ 433 if (sc->sc_xfercnt) { 434 lptintr(dev); 435 } else { 436 sc->sc_state &= ~OBUSY; 437 wakeup((caddr_t)dev); 438 } 439 } 440 441 /* 442 * lptopen -- reset the printer, then wait until it's selected and not busy. 443 * If LP_BYPASS flag is selected, then we do not try to select the 444 * printer -- this is just used for passing ioctls. 445 */ 446 447 static int 448 lptopen(struct dev_open_args *ap) 449 { 450 cdev_t dev = ap->a_head.a_dev; 451 int trys, err; 452 u_int unit = LPTUNIT(minor(dev)); 453 struct lpt_data *sc = UNITOSOFTC(unit); 454 device_t lptdev = UNITODEVICE(unit); 455 device_t ppbus = device_get_parent(lptdev); 456 457 if (!sc) 458 return (ENXIO); 459 460 if (sc->sc_state) { 461 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 462 return(EBUSY); 463 } else 464 sc->sc_state |= LPTINIT; 465 466 sc->sc_flags = LPTFLAGS(minor(dev)); 467 468 /* Check for open with BYPASS flag set. */ 469 if (sc->sc_flags & LP_BYPASS) { 470 sc->sc_state = OPEN; 471 return(0); 472 } 473 474 /* request the ppbus only if we don't have it already */ 475 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 476 /* give it a chance to try later */ 477 sc->sc_state = 0; 478 return (err); 479 } 480 481 crit_enter(); 482 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 483 484 /* set IRQ status according to ENABLE_IRQ flag 485 */ 486 if (sc->sc_irq & LP_ENABLE_IRQ) 487 sc->sc_irq |= LP_USE_IRQ; 488 else 489 sc->sc_irq &= ~LP_USE_IRQ; 490 491 /* init printer */ 492 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 493 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 494 ppb_wctr(ppbus, 0); 495 sc->sc_primed++; 496 DELAY(500); 497 } 498 } 499 500 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 501 502 /* wait till ready (printer running diagnostics) */ 503 trys = 0; 504 do { 505 /* ran out of waiting for the printer */ 506 if (trys++ >= LPINITRDY*4) { 507 crit_exit(); 508 sc->sc_state = 0; 509 lprintf(("status %x\n", ppb_rstr(ppbus))); 510 511 lpt_release_ppbus(lptdev); 512 return (EBUSY); 513 } 514 515 /* wait 1/4 second, give up if we get a signal */ 516 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) != 517 EWOULDBLOCK) { 518 sc->sc_state = 0; 519 crit_exit(); 520 521 lpt_release_ppbus(lptdev); 522 return (EBUSY); 523 } 524 525 /* is printer online and ready for output */ 526 } while ((ppb_rstr(ppbus) & 527 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 528 (LPS_SEL|LPS_NBSY|LPS_NERR)); 529 530 sc->sc_control = LPC_SEL|LPC_NINIT; 531 if (sc->sc_flags & LP_AUTOLF) 532 sc->sc_control |= LPC_AUTOL; 533 534 /* enable interrupt if interrupt-driven */ 535 if (sc->sc_irq & LP_USE_IRQ) 536 sc->sc_control |= LPC_ENA; 537 538 ppb_wctr(ppbus, sc->sc_control); 539 540 sc->sc_state = OPEN; 541 sc->sc_inbuf = kmalloc(BUFSIZE, M_LPT, M_WAITOK); 542 sc->sc_statbuf = kmalloc(BUFSTATSIZE, M_LPT, M_WAITOK); 543 sc->sc_xfercnt = 0; 544 545 crit_exit(); 546 547 /* release the ppbus */ 548 lpt_release_ppbus(lptdev); 549 550 /* only use timeout if using interrupt */ 551 lprintf(("irq %x\n", sc->sc_irq)); 552 if (sc->sc_irq & LP_USE_IRQ) { 553 sc->sc_state |= TOUT; 554 sc->sc_backoff = hz / LPTOUTINITIAL; 555 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, lptdev); 556 } 557 558 lprintf(("opened.\n")); 559 return(0); 560 } 561 562 /* 563 * lptclose -- close the device, free the local line buffer. 564 * 565 * Check for interrupted write call added. 566 */ 567 568 static int 569 lptclose(struct dev_close_args *ap) 570 { 571 cdev_t dev = ap->a_head.a_dev; 572 u_int unit = LPTUNIT(minor(dev)); 573 struct lpt_data *sc = UNITOSOFTC(unit); 574 device_t lptdev = UNITODEVICE(unit); 575 device_t ppbus = device_get_parent(lptdev); 576 int err; 577 578 if(sc->sc_flags & LP_BYPASS) 579 goto end_close; 580 581 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 582 return (err); 583 584 sc->sc_state &= ~OPEN; 585 586 /* if the last write was interrupted, don't complete it */ 587 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) { 588 while ((ppb_rstr(ppbus) & 589 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 590 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) { 591 /* wait 1/4 second, give up if we get a signal */ 592 if (tsleep((caddr_t)lptdev, PCATCH, 593 "lpclose", hz) != EWOULDBLOCK) { 594 break; 595 } 596 } 597 } 598 callout_stop(&sc->sc_callout); 599 ppb_wctr(ppbus, LPC_NINIT); 600 kfree(sc->sc_inbuf, M_LPT); 601 kfree(sc->sc_statbuf, M_LPT); 602 603 end_close: 604 /* release the bus anyway 605 * unregistration of interrupt forced by release 606 */ 607 lpt_release_ppbus(lptdev); 608 609 sc->sc_state = 0; 610 sc->sc_xfercnt = 0; 611 lprintf(("closed.\n")); 612 return(0); 613 } 614 615 /* 616 * lpt_pushbytes() 617 * Workhorse for actually spinning and writing bytes to printer 618 * Derived from lpa.c 619 * Originally by ? 620 * 621 * This code is only used when we are polling the port 622 */ 623 static int 624 lpt_pushbytes(device_t dev) 625 { 626 struct lpt_data *sc = DEVTOSOFTC(dev); 627 device_t ppbus = device_get_parent(dev); 628 int spin, err, tic; 629 char ch; 630 631 lprintf(("p")); 632 /* loop for every character .. */ 633 while (sc->sc_xfercnt > 0) { 634 /* printer data */ 635 ch = *(sc->sc_cp); 636 sc->sc_cp++; 637 sc->sc_xfercnt--; 638 639 /* 640 * Wait for printer ready. 641 * Loop 20 usecs testing BUSY bit, then sleep 642 * for exponentially increasing timeout. (vak) 643 */ 644 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 645 DELAY(1); /* XXX delay is NOT this accurate! */ 646 if (spin >= MAX_SPIN) { 647 tic = 0; 648 while (NOT_READY(ppbus)) { 649 /* 650 * Now sleep, every cycle a 651 * little longer .. 652 */ 653 tic = tic + tic + 1; 654 /* 655 * But no more than 10 seconds. (vak) 656 */ 657 if (tic > MAX_SLEEP) 658 tic = MAX_SLEEP; 659 err = tsleep((caddr_t)dev, 0, 660 LPT_NAME "poll", tic); 661 if (err != EWOULDBLOCK) { 662 return (err); 663 } 664 } 665 } 666 667 /* output data */ 668 ppb_wdtr(ppbus, ch); 669 /* strobe */ 670 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 671 ppb_wctr(ppbus, sc->sc_control); 672 673 } 674 return(0); 675 } 676 677 /* 678 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 679 */ 680 681 static int 682 lptread(struct dev_read_args *ap) 683 { 684 cdev_t dev = ap->a_head.a_dev; 685 struct uio *uio = ap->a_uio; 686 u_int unit = LPTUNIT(minor(dev)); 687 struct lpt_data *sc = UNITOSOFTC(unit); 688 device_t lptdev = UNITODEVICE(unit); 689 device_t ppbus = device_get_parent(lptdev); 690 int error = 0, len; 691 692 if (sc->sc_flags & LP_BYPASS) { 693 /* we can't do reads in bypass mode */ 694 return (EPERM); 695 } 696 697 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 698 return (error); 699 700 /* read data in an other buffer, read/write may be simultaneous */ 701 len = 0; 702 while (uio->uio_resid) { 703 error = ppb_1284_read(ppbus, PPB_NIBBLE, sc->sc_statbuf, 704 (int)szmin(BUFSTATSIZE, uio->uio_resid), 705 &len); 706 if (error) 707 goto error; 708 709 if (!len) 710 goto error; /* no more data */ 711 712 if ((error = uiomove(sc->sc_statbuf, (size_t)len, uio))) 713 goto error; 714 } 715 716 error: 717 ppb_1284_terminate(ppbus); 718 return (error); 719 } 720 721 /* 722 * lptwrite --copy a line from user space to a local buffer, then call 723 * putc to get the chars moved to the output queue. 724 * 725 * Flagging of interrupted write added. 726 */ 727 728 static int 729 lptwrite(struct dev_write_args *ap) 730 { 731 cdev_t dev = ap->a_head.a_dev; 732 struct uio *uio = ap->a_uio; 733 unsigned n; 734 int err; 735 u_int unit = LPTUNIT(minor(dev)); 736 struct lpt_data *sc = UNITOSOFTC(unit); 737 device_t lptdev = UNITODEVICE(unit); 738 device_t ppbus = device_get_parent(lptdev); 739 740 if(sc->sc_flags & LP_BYPASS) { 741 /* we can't do writes in bypass mode */ 742 return(EPERM); 743 } 744 745 /* request the ppbus only if we don't have it already */ 746 /* XXX interrupt registration?! */ 747 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 748 return (err); 749 750 /* if interrupts are working, register the handler */ 751 if (sc->sc_irq & LP_USE_IRQ) { 752 /* register our interrupt handler */ 753 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 754 0, lpt_intr, lptdev, 755 &sc->intr_cookie, NULL, NULL); 756 if (err) { 757 device_printf(lptdev, "handler registration failed, polled mode.\n"); 758 sc->sc_irq &= ~LP_USE_IRQ; 759 } 760 } 761 762 sc->sc_state &= ~INTERRUPTED; 763 while ((n = (unsigned)szmin(BUFSIZE, uio->uio_resid)) != 0) { 764 sc->sc_cp = sc->sc_inbuf; 765 uiomove(sc->sc_cp, (size_t)n, uio); 766 sc->sc_xfercnt = n ; 767 768 if (sc->sc_irq & LP_ENABLE_EXT) { 769 /* try any extended mode */ 770 err = ppb_write(ppbus, sc->sc_cp, 771 sc->sc_xfercnt, 0); 772 switch (err) { 773 case 0: 774 /* if not all data was sent, we could rely 775 * on polling for the last bytes */ 776 sc->sc_xfercnt = 0; 777 break; 778 case EINTR: 779 sc->sc_state |= INTERRUPTED; 780 return(err); 781 case EINVAL: 782 /* advanced mode not avail */ 783 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 784 break; 785 default: 786 return(err); 787 } 788 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 789 lprintf(("i")); 790 /* if the printer is ready for a char, */ 791 /* give it one */ 792 if ((sc->sc_state & OBUSY) == 0){ 793 lprintf(("\nC %d. ", sc->sc_xfercnt)); 794 lptintr(lptdev); 795 } 796 lprintf(("W ")); 797 if (sc->sc_state & OBUSY) 798 if ((err = tsleep((caddr_t)lptdev, 799 PCATCH, LPT_NAME "write", 0))) { 800 sc->sc_state |= INTERRUPTED; 801 return(err); 802 } 803 } 804 805 /* check to see if we must do a polled write */ 806 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 807 lprintf(("p")); 808 809 err = lpt_pushbytes(lptdev); 810 811 if (err) 812 return(err); 813 } 814 } 815 816 /* we have not been interrupted, release the ppbus */ 817 lpt_release_ppbus(lptdev); 818 819 return(0); 820 } 821 822 /* 823 * lpt_intr -- handle printer interrupts which occur when the printer is 824 * ready to accept another char. 825 * 826 * do checking for interrupted write call. 827 */ 828 829 static void 830 lpt_intr(void *arg) 831 { 832 device_t lptdev = (device_t)arg; 833 device_t ppbus = device_get_parent(lptdev); 834 struct lpt_data *sc = DEVTOSOFTC(lptdev); 835 int sts = 0; 836 int i; 837 838 /* we must own the bus to use it */ 839 if ((sc->sc_state & HAVEBUS) == 0) 840 return; 841 842 /* 843 * Is printer online and ready for output? 844 * 845 * Avoid falling back to lptout() too quickly. First spin-loop 846 * to see if the printer will become ready ``really soon now''. 847 */ 848 for (i = 0; i < 100 && 849 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 850 851 if ((sts & RDY_MASK) == LP_READY) { 852 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 853 sc->sc_backoff = hz/LPTOUTINITIAL; 854 855 if (sc->sc_xfercnt) { 856 /* send char */ 857 /*lprintf(("%x ", *sc->sc_cp)); */ 858 ppb_wdtr(ppbus, *sc->sc_cp++) ; 859 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 860 /* DELAY(X) */ 861 ppb_wctr(ppbus, sc->sc_control); 862 863 /* any more data for printer */ 864 if(--(sc->sc_xfercnt) > 0) return; 865 } 866 867 /* 868 * No more data waiting for printer. 869 * Wakeup is not done if write call was not interrupted. 870 */ 871 sc->sc_state &= ~OBUSY; 872 873 if(!(sc->sc_state & INTERRUPTED)) 874 wakeup((caddr_t)lptdev); 875 lprintf(("w ")); 876 return; 877 } else { /* check for error */ 878 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 879 (sc->sc_state & OPEN)) 880 sc->sc_state |= EERROR; 881 /* lptout() will jump in and try to restart. */ 882 } 883 lprintf(("sts %x ", sts)); 884 } 885 886 static void 887 lptintr(device_t dev) 888 { 889 /* call the interrupt at required spl level */ 890 crit_enter(); 891 892 lpt_intr(dev); 893 894 crit_exit(); 895 } 896 897 static int 898 lptioctl(struct dev_ioctl_args *ap) 899 { 900 cdev_t dev = ap->a_head.a_dev; 901 int error = 0; 902 u_int unit = LPTUNIT(minor(dev)); 903 struct lpt_data *sc = UNITOSOFTC(unit); 904 u_char old_sc_irq; /* old printer IRQ status */ 905 906 switch (ap->a_cmd) { 907 case LPT_IRQ : 908 if(sc->sc_irq & LP_HAS_IRQ) { 909 /* 910 * NOTE: 911 * If the IRQ status is changed, 912 * this will only be visible on the 913 * next open. 914 * 915 * If interrupt status changes, 916 * this gets syslog'd. 917 */ 918 old_sc_irq = sc->sc_irq; 919 switch(*(int*)ap->a_data) { 920 case 0: 921 sc->sc_irq &= (~LP_ENABLE_IRQ); 922 break; 923 case 1: 924 sc->sc_irq &= (~LP_ENABLE_EXT); 925 sc->sc_irq |= LP_ENABLE_IRQ; 926 break; 927 case 2: 928 /* classic irq based transfer and advanced 929 * modes are in conflict 930 */ 931 sc->sc_irq &= (~LP_ENABLE_IRQ); 932 sc->sc_irq |= LP_ENABLE_EXT; 933 break; 934 case 3: 935 sc->sc_irq &= (~LP_ENABLE_EXT); 936 break; 937 default: 938 break; 939 } 940 941 if (old_sc_irq != sc->sc_irq ) 942 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 943 unit, 944 (sc->sc_irq & LP_ENABLE_IRQ)? 945 "interrupt-driven":"polled", 946 (sc->sc_irq & LP_ENABLE_EXT)? 947 "extended":"standard"); 948 } else /* polled port */ 949 error = EOPNOTSUPP; 950 break; 951 default: 952 error = ENODEV; 953 } 954 955 return(error); 956 } 957 958 /* 959 * Because lpt is a static device that always exists under a ppbus device, 960 * and not scanned by the ppbus device, we need an identify function to 961 * install its device. 962 */ 963 static device_method_t lpt_methods[] = { 964 /* device interface */ 965 DEVMETHOD(device_identify, bus_generic_identify), 966 DEVMETHOD(device_probe, lpt_probe), 967 DEVMETHOD(device_attach, lpt_attach), 968 969 DEVMETHOD_END 970 }; 971 972 static driver_t lpt_driver = { 973 LPT_NAME, 974 lpt_methods, 975 sizeof(struct lpt_data), 976 }; 977 978 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, NULL, NULL); 979
Cache object: 7b72d319e0c64697c6c08666ed3101e2
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