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 */ 52 53 #include <sys/cdefs.h> 54 __FBSDID("$FreeBSD$"); 55 56 /* 57 * Device Driver for AT parallel printer port 58 * Written by William Jolitz 12/18/90 59 */ 60 61 /* 62 * Updated for ppbus by Nicolas Souchu 63 * [Mon Jul 28 1997] 64 */ 65 66 #include "opt_lpt.h" 67 68 #include <sys/param.h> 69 #include <sys/systm.h> 70 #include <sys/module.h> 71 #include <sys/bus.h> 72 #include <sys/conf.h> 73 #include <sys/kernel.h> 74 #include <sys/uio.h> 75 #include <sys/syslog.h> 76 #include <sys/malloc.h> 77 78 #include <machine/bus.h> 79 #include <machine/resource.h> 80 #include <sys/rman.h> 81 82 #include <dev/ppbus/lptio.h> 83 #include <dev/ppbus/ppbconf.h> 84 #include <dev/ppbus/ppb_1284.h> 85 #include <dev/ppbus/lpt.h> 86 #include "ppbus_if.h" 87 #include <dev/ppbus/ppbio.h> 88 89 #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 static struct cdevsw lpt_cdevsw = { 193 .d_version = D_VERSION, 194 .d_flags = D_NEEDGIANT, 195 .d_open = lptopen, 196 .d_close = lptclose, 197 .d_read = lptread, 198 .d_write = lptwrite, 199 .d_ioctl = lptioctl, 200 .d_name = LPT_NAME, 201 }; 202 203 static int 204 lpt_request_ppbus(device_t dev, int how) 205 { 206 device_t ppbus = device_get_parent(dev); 207 struct lpt_data *sc = DEVTOSOFTC(dev); 208 int error; 209 210 if (sc->sc_state & HAVEBUS) 211 return (0); 212 213 /* we have the bus only if the request succeded */ 214 if ((error = ppb_request_bus(ppbus, dev, how)) == 0) 215 sc->sc_state |= HAVEBUS; 216 217 return (error); 218 } 219 220 static int 221 lpt_release_ppbus(device_t dev) 222 { 223 device_t ppbus = device_get_parent(dev); 224 struct lpt_data *sc = DEVTOSOFTC(dev); 225 int error = 0; 226 227 if ((error = ppb_release_bus(ppbus, dev)) == 0) 228 sc->sc_state &= ~HAVEBUS; 229 230 return (error); 231 } 232 233 /* 234 * Internal routine to lptprobe to do port tests of one byte value 235 */ 236 static int 237 lpt_port_test(device_t ppbus, u_char data, u_char mask) 238 { 239 int temp, timeout; 240 241 data = data & mask; 242 ppb_wdtr(ppbus, data); 243 timeout = 10000; 244 do { 245 DELAY(10); 246 temp = ppb_rdtr(ppbus) & mask; 247 } 248 while (temp != data && --timeout); 249 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 250 return (temp == data); 251 } 252 253 /* 254 * Probe simplified by replacing multiple loops with a hardcoded 255 * test pattern - 1999/02/08 des@freebsd.org 256 * 257 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 258 * Based partially on Rod Grimes' printer probe 259 * 260 * Logic: 261 * 1) If no port address was given, use the bios detected ports 262 * and autodetect what ports the printers are on. 263 * 2) Otherwise, probe the data port at the address given, 264 * using the method in Rod Grimes' port probe. 265 * (Much code ripped off directly from Rod's probe.) 266 * 267 * Comments from Rod's probe: 268 * Logic: 269 * 1) You should be able to write to and read back the same value 270 * to the data port. Do an alternating zeros, alternating ones, 271 * walking zero, and walking one test to check for stuck bits. 272 * 273 * 2) You should be able to write to and read back the same value 274 * to the control port lower 5 bits, the upper 3 bits are reserved 275 * per the IBM PC technical reference manauls and different boards 276 * do different things with them. Do an alternating zeros, alternating 277 * ones, walking zero, and walking one test to check for stuck bits. 278 * 279 * Some printers drag the strobe line down when the are powered off 280 * so this bit has been masked out of the control port test. 281 * 282 * XXX Some printers may not like a fast pulse on init or strobe, I 283 * don't know at this point, if that becomes a problem these bits 284 * should be turned off in the mask byte for the control port test. 285 * 286 * We are finally left with a mask of 0x14, due to some printers 287 * being adamant about holding other bits high ........ 288 * 289 * Before probing the control port, we write a 0 to the data port - 290 * If not, some printers chuck out garbage when the strobe line 291 * gets toggled. 292 * 293 * 3) Set the data and control ports to a value of 0 294 * 295 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 296 * Epson FX-1170 and C.Itoh 8510RM 297 * printers. 298 * Quick exit on fail added. 299 */ 300 static int 301 lpt_detect(device_t dev) 302 { 303 device_t ppbus = device_get_parent(dev); 304 305 static u_char testbyte[18] = { 306 0x55, /* alternating zeros */ 307 0xaa, /* alternating ones */ 308 0xfe, 0xfd, 0xfb, 0xf7, 309 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 310 0x01, 0x02, 0x04, 0x08, 311 0x10, 0x20, 0x40, 0x80 /* walking one */ 312 }; 313 int i, error, status; 314 315 status = 1; /* assume success */ 316 317 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 318 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 319 status = 0; 320 goto end_probe; 321 } 322 323 for (i = 0; i < 18 && status; i++) 324 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 325 status = 0; 326 goto end_probe; 327 } 328 329 end_probe: 330 /* write 0's to control and data ports */ 331 ppb_wdtr(ppbus, 0); 332 ppb_wctr(ppbus, 0); 333 334 lpt_release_ppbus(dev); 335 336 return (status); 337 } 338 339 static void 340 lpt_identify(driver_t *driver, device_t parent) 341 { 342 343 device_t dev; 344 345 dev = device_find_child(parent, LPT_NAME, 0); 346 if (!dev) 347 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1); 348 } 349 350 /* 351 * lpt_probe() 352 */ 353 static int 354 lpt_probe(device_t dev) 355 { 356 357 if (!lpt_detect(dev)) 358 return (ENXIO); 359 360 device_set_desc(dev, "Printer"); 361 362 return (0); 363 } 364 365 static int 366 lpt_attach(device_t dev) 367 { 368 device_t ppbus = device_get_parent(dev); 369 struct lpt_data *sc = DEVTOSOFTC(dev); 370 int zero = 0, unit = device_get_unit(dev); 371 int error; 372 intptr_t irq; 373 374 sc->sc_primed = 0; /* not primed yet */ 375 376 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 377 printf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 378 return (0); 379 } 380 381 ppb_wctr(ppbus, LPC_NINIT); 382 383 /* check if we can use interrupt, should be done by ppc stuff */ 384 lprintf(("oldirq %x\n", sc->sc_irq)); 385 386 /* retrieve the ppbus irq */ 387 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 388 389 if (irq > 0) { 390 /* declare our interrupt handler */ 391 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 392 &zero, irq, irq, 1, RF_SHAREABLE); 393 } 394 if (sc->intr_resource) { 395 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 396 device_printf(dev, "Interrupt-driven port\n"); 397 } else { 398 sc->sc_irq = 0; 399 device_printf(dev, "Polled port\n"); 400 } 401 lprintf(("irq %x %x\n", (int)irq, sc->sc_irq)); 402 403 lpt_release_ppbus(dev); 404 405 make_dev(&lpt_cdevsw, unit, 406 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 407 make_dev(&lpt_cdevsw, 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 timeout(lptout, (caddr_t)dev, sc->sc_backoff); 427 } else 428 sc->sc_state &= ~TOUT; 429 430 if (sc->sc_state & EERROR) 431 sc->sc_state &= ~EERROR; 432 433 /* 434 * Avoid possible hangs due to missed interrupts 435 */ 436 if (sc->sc_xfercnt) { 437 lptintr(dev); 438 } else { 439 sc->sc_state &= ~OBUSY; 440 wakeup(dev); 441 } 442 } 443 444 /* 445 * lptopen -- reset the printer, then wait until it's selected and not busy. 446 * If LP_BYPASS flag is selected, then we do not try to select the 447 * printer -- this is just used for passing ioctls. 448 */ 449 450 static int 451 lptopen(struct cdev *dev, int flags, int fmt, struct thread *td) 452 { 453 int s; 454 int trys, err; 455 u_int unit = LPTUNIT(minor(dev)); 456 struct lpt_data *sc = UNITOSOFTC(unit); 457 device_t lptdev = UNITODEVICE(unit); 458 device_t ppbus = device_get_parent(lptdev); 459 460 if (!sc) 461 return (ENXIO); 462 463 if (sc->sc_state) { 464 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 465 return(EBUSY); 466 } else 467 sc->sc_state |= LPTINIT; 468 469 sc->sc_flags = LPTFLAGS(minor(dev)); 470 471 /* Check for open with BYPASS flag set. */ 472 if (sc->sc_flags & LP_BYPASS) { 473 sc->sc_state = OPEN; 474 return(0); 475 } 476 477 /* request the ppbus only if we don't have it already */ 478 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 479 /* give it a chance to try later */ 480 sc->sc_state = 0; 481 return (err); 482 } 483 484 s = spltty(); 485 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 486 487 /* set IRQ status according to ENABLE_IRQ flag 488 */ 489 if (sc->sc_irq & LP_ENABLE_IRQ) 490 sc->sc_irq |= LP_USE_IRQ; 491 else 492 sc->sc_irq &= ~LP_USE_IRQ; 493 494 /* init printer */ 495 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 496 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 497 ppb_wctr(ppbus, 0); 498 sc->sc_primed++; 499 DELAY(500); 500 } 501 } 502 503 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 504 505 /* wait till ready (printer running diagnostics) */ 506 trys = 0; 507 do { 508 /* ran out of waiting for the printer */ 509 if (trys++ >= LPINITRDY*4) { 510 splx(s); 511 sc->sc_state = 0; 512 lprintf(("status %x\n", ppb_rstr(ppbus))); 513 514 lpt_release_ppbus(lptdev); 515 return (EBUSY); 516 } 517 518 /* wait 1/4 second, give up if we get a signal */ 519 if (tsleep(lptdev, LPPRI|PCATCH, "lptinit", hz/4) != 520 EWOULDBLOCK) { 521 sc->sc_state = 0; 522 splx(s); 523 524 lpt_release_ppbus(lptdev); 525 return (EBUSY); 526 } 527 528 /* is printer online and ready for output */ 529 } while ((ppb_rstr(ppbus) & 530 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 531 (LPS_SEL|LPS_NBSY|LPS_NERR)); 532 533 sc->sc_control = LPC_SEL|LPC_NINIT; 534 if (sc->sc_flags & LP_AUTOLF) 535 sc->sc_control |= LPC_AUTOL; 536 537 /* enable interrupt if interrupt-driven */ 538 if (sc->sc_irq & LP_USE_IRQ) 539 sc->sc_control |= LPC_ENA; 540 541 ppb_wctr(ppbus, sc->sc_control); 542 543 sc->sc_state = OPEN; 544 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 545 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK); 546 sc->sc_xfercnt = 0; 547 splx(s); 548 549 /* release the ppbus */ 550 lpt_release_ppbus(lptdev); 551 552 /* only use timeout if using interrupt */ 553 lprintf(("irq %x\n", sc->sc_irq)); 554 if (sc->sc_irq & LP_USE_IRQ) { 555 sc->sc_state |= TOUT; 556 timeout(lptout, (caddr_t)lptdev, 557 (sc->sc_backoff = hz/LPTOUTINITIAL)); 558 } 559 560 lprintf(("opened.\n")); 561 return(0); 562 } 563 564 /* 565 * lptclose -- close the device, free the local line buffer. 566 * 567 * Check for interrupted write call added. 568 */ 569 570 static int 571 lptclose(struct cdev *dev, int flags, int fmt, struct thread *td) 572 { 573 u_int unit = LPTUNIT(minor(dev)); 574 struct lpt_data *sc = UNITOSOFTC(unit); 575 device_t lptdev = UNITODEVICE(unit); 576 device_t ppbus = device_get_parent(lptdev); 577 int err; 578 579 if(sc->sc_flags & LP_BYPASS) 580 goto end_close; 581 582 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 583 return (err); 584 585 sc->sc_state &= ~OPEN; 586 587 /* if the last write was interrupted, don't complete it */ 588 if((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 589 while ((ppb_rstr(ppbus) & 590 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 591 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 592 /* wait 1/4 second, give up if we get a signal */ 593 if (tsleep(lptdev, LPPRI|PCATCH, 594 "lpclose", hz) != EWOULDBLOCK) 595 break; 596 597 ppb_wctr(ppbus, LPC_NINIT); 598 free(sc->sc_inbuf, M_DEVBUF); 599 free(sc->sc_statbuf, M_DEVBUF); 600 601 end_close: 602 /* release the bus anyway 603 * unregistration of interrupt forced by release 604 */ 605 lpt_release_ppbus(lptdev); 606 607 sc->sc_state = 0; 608 sc->sc_xfercnt = 0; 609 lprintf(("closed.\n")); 610 return(0); 611 } 612 613 /* 614 * lpt_pushbytes() 615 * Workhorse for actually spinning and writing bytes to printer 616 * Derived from lpa.c 617 * Originally by ? 618 * 619 * This code is only used when we are polling the port 620 */ 621 static int 622 lpt_pushbytes(device_t dev) 623 { 624 struct lpt_data *sc = DEVTOSOFTC(dev); 625 device_t ppbus = device_get_parent(dev); 626 int spin, err, tic; 627 char ch; 628 629 lprintf(("p")); 630 /* loop for every character .. */ 631 while (sc->sc_xfercnt > 0) { 632 /* printer data */ 633 ch = *(sc->sc_cp); 634 sc->sc_cp++; 635 sc->sc_xfercnt--; 636 637 /* 638 * Wait for printer ready. 639 * Loop 20 usecs testing BUSY bit, then sleep 640 * for exponentially increasing timeout. (vak) 641 */ 642 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 643 DELAY(1); /* XXX delay is NOT this accurate! */ 644 if (spin >= MAX_SPIN) { 645 tic = 0; 646 while (NOT_READY(ppbus)) { 647 /* 648 * Now sleep, every cycle a 649 * little longer .. 650 */ 651 tic = tic + tic + 1; 652 /* 653 * But no more than 10 seconds. (vak) 654 */ 655 if (tic > MAX_SLEEP) 656 tic = MAX_SLEEP; 657 err = tsleep(dev, LPPRI, 658 LPT_NAME "poll", tic); 659 if (err != EWOULDBLOCK) { 660 return (err); 661 } 662 } 663 } 664 665 /* output data */ 666 ppb_wdtr(ppbus, ch); 667 /* strobe */ 668 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 669 ppb_wctr(ppbus, sc->sc_control); 670 671 } 672 return(0); 673 } 674 675 /* 676 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 677 */ 678 679 static int 680 lptread(struct cdev *dev, struct uio *uio, int ioflag) 681 { 682 u_int unit = LPTUNIT(minor(dev)); 683 struct lpt_data *sc = UNITOSOFTC(unit); 684 device_t lptdev = UNITODEVICE(unit); 685 device_t ppbus = device_get_parent(lptdev); 686 int error = 0, len; 687 688 if (sc->sc_flags & LP_BYPASS) { 689 /* we can't do reads in bypass mode */ 690 return (EPERM); 691 } 692 693 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 694 return (error); 695 696 /* read data in an other buffer, read/write may be simultaneous */ 697 len = 0; 698 while (uio->uio_resid) { 699 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 700 sc->sc_statbuf, min(BUFSTATSIZE, 701 uio->uio_resid), &len))) { 702 goto error; 703 } 704 705 if (!len) 706 goto error; /* no more data */ 707 708 if ((error = uiomove(sc->sc_statbuf, len, uio))) 709 goto error; 710 } 711 712 error: 713 ppb_1284_terminate(ppbus); 714 return (error); 715 } 716 717 /* 718 * lptwrite --copy a line from user space to a local buffer, then call 719 * putc to get the chars moved to the output queue. 720 * 721 * Flagging of interrupted write added. 722 */ 723 724 static int 725 lptwrite(struct cdev *dev, struct uio *uio, int ioflag) 726 { 727 register unsigned n; 728 int err; 729 u_int unit = LPTUNIT(minor(dev)); 730 struct lpt_data *sc = UNITOSOFTC(unit); 731 device_t lptdev = UNITODEVICE(unit); 732 device_t ppbus = device_get_parent(lptdev); 733 734 if(sc->sc_flags & LP_BYPASS) { 735 /* we can't do writes in bypass mode */ 736 return(EPERM); 737 } 738 739 /* request the ppbus only if we don't have it already */ 740 /* XXX interrupt registration?! */ 741 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 742 return (err); 743 744 /* if interrupts are working, register the handler */ 745 if (sc->sc_irq & LP_USE_IRQ) { 746 /* register our interrupt handler */ 747 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 748 INTR_TYPE_TTY, lpt_intr, lptdev, 749 &sc->intr_cookie); 750 if (err) { 751 device_printf(lptdev, "handler registration failed, polled mode.\n"); 752 sc->sc_irq &= ~LP_USE_IRQ; 753 } 754 } 755 756 sc->sc_state &= ~INTERRUPTED; 757 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 758 sc->sc_cp = sc->sc_inbuf; 759 uiomove(sc->sc_cp, n, uio); 760 sc->sc_xfercnt = n ; 761 762 if (sc->sc_irq & LP_ENABLE_EXT) { 763 /* try any extended mode */ 764 err = ppb_write(ppbus, sc->sc_cp, 765 sc->sc_xfercnt, 0); 766 switch (err) { 767 case 0: 768 /* if not all data was sent, we could rely 769 * on polling for the last bytes */ 770 sc->sc_xfercnt = 0; 771 break; 772 case EINTR: 773 sc->sc_state |= INTERRUPTED; 774 return(err); 775 case EINVAL: 776 /* advanced mode not avail */ 777 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 778 break; 779 default: 780 return(err); 781 } 782 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 783 lprintf(("i")); 784 /* if the printer is ready for a char, */ 785 /* give it one */ 786 if ((sc->sc_state & OBUSY) == 0){ 787 lprintf(("\nC %d. ", sc->sc_xfercnt)); 788 lptintr(lptdev); 789 } 790 lprintf(("W ")); 791 if (sc->sc_state & OBUSY) 792 if ((err = tsleep(lptdev, 793 LPPRI|PCATCH, LPT_NAME "write", 0))) { 794 sc->sc_state |= INTERRUPTED; 795 return(err); 796 } 797 } 798 799 /* check to see if we must do a polled write */ 800 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 801 lprintf(("p")); 802 803 err = lpt_pushbytes(lptdev); 804 805 if (err) 806 return(err); 807 } 808 } 809 810 /* we have not been interrupted, release the ppbus */ 811 lpt_release_ppbus(lptdev); 812 813 return(0); 814 } 815 816 /* 817 * lpt_intr -- handle printer interrupts which occur when the printer is 818 * ready to accept another char. 819 * 820 * do checking for interrupted write call. 821 */ 822 823 static void 824 lpt_intr(void *arg) 825 { 826 device_t lptdev = (device_t)arg; 827 device_t ppbus = device_get_parent(lptdev); 828 struct lpt_data *sc = DEVTOSOFTC(lptdev); 829 int sts = 0; 830 int i; 831 832 /* we must own the bus to use it */ 833 if ((sc->sc_state & HAVEBUS) == 0) 834 return; 835 836 /* 837 * Is printer online and ready for output? 838 * 839 * Avoid falling back to lptout() too quickly. First spin-loop 840 * to see if the printer will become ready ``really soon now''. 841 */ 842 for (i = 0; i < 100 && 843 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 844 845 if ((sts & RDY_MASK) == LP_READY) { 846 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 847 sc->sc_backoff = hz/LPTOUTINITIAL; 848 849 if (sc->sc_xfercnt) { 850 /* send char */ 851 /*lprintf(("%x ", *sc->sc_cp)); */ 852 ppb_wdtr(ppbus, *sc->sc_cp++) ; 853 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 854 /* DELAY(X) */ 855 ppb_wctr(ppbus, sc->sc_control); 856 857 /* any more data for printer */ 858 if(--(sc->sc_xfercnt) > 0) return; 859 } 860 861 /* 862 * No more data waiting for printer. 863 * Wakeup is not done if write call was not interrupted. 864 */ 865 sc->sc_state &= ~OBUSY; 866 867 if(!(sc->sc_state & INTERRUPTED)) 868 wakeup(lptdev); 869 lprintf(("w ")); 870 return; 871 } else { /* check for error */ 872 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 873 (sc->sc_state & OPEN)) 874 sc->sc_state |= EERROR; 875 /* lptout() will jump in and try to restart. */ 876 } 877 lprintf(("sts %x ", sts)); 878 } 879 880 static void 881 lptintr(device_t dev) 882 { 883 /* call the interrupt at required spl level */ 884 int s = spltty(); 885 886 lpt_intr(dev); 887 888 splx(s); 889 return; 890 } 891 892 static int 893 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 894 { 895 int error = 0; 896 u_int unit = LPTUNIT(minor(dev)); 897 struct lpt_data *sc = UNITOSOFTC(unit); 898 u_char old_sc_irq; /* old printer IRQ status */ 899 900 switch (cmd) { 901 case LPT_IRQ : 902 if(sc->sc_irq & LP_HAS_IRQ) { 903 /* 904 * NOTE: 905 * If the IRQ status is changed, 906 * this will only be visible on the 907 * next open. 908 * 909 * If interrupt status changes, 910 * this gets syslog'd. 911 */ 912 old_sc_irq = sc->sc_irq; 913 switch(*(int*)data) { 914 case 0: 915 sc->sc_irq &= (~LP_ENABLE_IRQ); 916 break; 917 case 1: 918 sc->sc_irq &= (~LP_ENABLE_EXT); 919 sc->sc_irq |= LP_ENABLE_IRQ; 920 break; 921 case 2: 922 /* classic irq based transfer and advanced 923 * modes are in conflict 924 */ 925 sc->sc_irq &= (~LP_ENABLE_IRQ); 926 sc->sc_irq |= LP_ENABLE_EXT; 927 break; 928 case 3: 929 sc->sc_irq &= (~LP_ENABLE_EXT); 930 break; 931 default: 932 break; 933 } 934 935 if (old_sc_irq != sc->sc_irq ) 936 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 937 unit, 938 (sc->sc_irq & LP_ENABLE_IRQ)? 939 "interrupt-driven":"polled", 940 (sc->sc_irq & LP_ENABLE_EXT)? 941 "extended":"standard"); 942 } else /* polled port */ 943 error = EOPNOTSUPP; 944 break; 945 default: 946 error = ENODEV; 947 } 948 949 return(error); 950 } 951 952 static device_method_t lpt_methods[] = { 953 /* device interface */ 954 DEVMETHOD(device_identify, lpt_identify), 955 DEVMETHOD(device_probe, lpt_probe), 956 DEVMETHOD(device_attach, lpt_attach), 957 958 { 0, 0 } 959 }; 960 961 static driver_t lpt_driver = { 962 LPT_NAME, 963 lpt_methods, 964 sizeof(struct lpt_data), 965 }; 966 967 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 968