1 /* 2 * Copyright (c) 1990 William F. Jolitz, TeleMuse 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This software is a component of "386BSD" developed by 16 * William F. Jolitz, TeleMuse. 17 * 4. Neither the name of the developer nor the name "386BSD" 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 22 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 23 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 24 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 25 * NOT MAKE USE OF THIS WORK. 26 * 27 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 28 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 29 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 30 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 31 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 32 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 33 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 34 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 39 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 46 * SUCH DAMAGE. 47 * 48 * from: unknown origin, 386BSD 0.1 49 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp 50 * From Id: nlpt.c,v 1.14 1999/02/08 13:55:43 des Exp 51 * $FreeBSD: src/sys/dev/ppbus/lpt.c,v 1.15.2.3 2000/07/07 00:30:40 obrien Exp $ 52 * $DragonFly: src/sys/dev/misc/lpt/lpt.c,v 1.19 2006/12/22 23:26:17 swildner Exp $ 53 */ 54 55 /* 56 * Device Driver for AT parallel printer port 57 * Written by William Jolitz 12/18/90 58 */ 59 60 /* 61 * Updated for ppbus by Nicolas Souchu 62 * [Mon Jul 28 1997] 63 */ 64 65 #include "opt_lpt.h" 66 67 #include <sys/param.h> 68 #include <sys/systm.h> 69 #include <sys/module.h> 70 #include <sys/bus.h> 71 #include <sys/conf.h> 72 #include <sys/device.h> 73 #include <sys/kernel.h> 74 #include <sys/uio.h> 75 #include <sys/syslog.h> 76 #include <sys/thread2.h> 77 #include <sys/malloc.h> 78 #include <sys/rman.h> 79 80 #include <machine/clock.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 #define CDEV_MAJOR 16 194 static struct dev_ops lpt_ops = { 195 { LPT_NAME, CDEV_MAJOR, 0 }, 196 .d_open = lptopen, 197 .d_close = lptclose, 198 .d_read = lptread, 199 .d_write = lptwrite, 200 .d_ioctl = lptioctl, 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 kprintf(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 /* 340 * lpt_probe() 341 */ 342 static int 343 lpt_probe(device_t dev) 344 { 345 struct lpt_data *sc; 346 347 sc = DEVTOSOFTC(dev); 348 bzero(sc, sizeof(struct lpt_data)); 349 350 /* 351 * Now, try to detect the printer. 352 */ 353 if (!lpt_detect(dev)) 354 return (ENXIO); 355 356 device_set_desc(dev, "Printer"); 357 358 return (0); 359 } 360 361 static int 362 lpt_attach(device_t dev) 363 { 364 device_t ppbus = device_get_parent(dev); 365 struct lpt_data *sc = DEVTOSOFTC(dev); 366 int zero = 0, unit = device_get_unit(dev); 367 int error; 368 uintptr_t irq; 369 370 sc->sc_primed = 0; /* not primed yet */ 371 callout_init(&sc->sc_callout); 372 373 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 374 kprintf(LPT_NAME ": cannot alloc ppbus (%d)!\n", error); 375 return (0); 376 } 377 378 ppb_wctr(ppbus, LPC_NINIT); 379 380 /* check if we can use interrupt, should be done by ppc stuff */ 381 lprintf(("oldirq %x\n", sc->sc_irq)); 382 383 /* retrieve the ppbus irq */ 384 BUS_READ_IVAR(ppbus, dev, PPBUS_IVAR_IRQ, &irq); 385 386 if (irq > 0) { 387 /* declare our interrupt handler */ 388 sc->intr_resource = bus_alloc_resource(dev, SYS_RES_IRQ, 389 &zero, irq, irq, 1, RF_SHAREABLE); 390 } 391 if (sc->intr_resource) { 392 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 393 device_printf(dev, "Interrupt-driven port\n"); 394 } else { 395 sc->sc_irq = 0; 396 device_printf(dev, "Polled port\n"); 397 } 398 lprintf(("irq %x %x\n", irq, sc->sc_irq)); 399 400 lpt_release_ppbus(dev); 401 402 make_dev(&lpt_ops, unit, UID_ROOT, GID_WHEEL, 403 0600, LPT_NAME "%d", unit); 404 make_dev(&lpt_ops, unit | LP_BYPASS, UID_ROOT, GID_WHEEL, 405 0600, LPT_NAME "%d.ctl", unit); 406 return (0); 407 } 408 409 static void 410 lptout(void *arg) 411 { 412 device_t dev = (device_t)arg; 413 struct lpt_data *sc = DEVTOSOFTC(dev); 414 #ifdef LPT_DEBUG 415 device_t ppbus = device_get_parent(dev); 416 #endif 417 418 lprintf(("T %x ", ppb_rstr(ppbus))); 419 if (sc->sc_state & OPEN) { 420 sc->sc_backoff++; 421 if (sc->sc_backoff > hz/LPTOUTMAX) 422 sc->sc_backoff = sc->sc_backoff > hz/LPTOUTMAX; 423 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, dev); 424 } else { 425 sc->sc_state &= ~TOUT; 426 } 427 428 if (sc->sc_state & EERROR) 429 sc->sc_state &= ~EERROR; 430 431 /* 432 * Avoid possible hangs due to missed interrupts 433 */ 434 if (sc->sc_xfercnt) { 435 lptintr(dev); 436 } else { 437 sc->sc_state &= ~OBUSY; 438 wakeup((caddr_t)dev); 439 } 440 } 441 442 /* 443 * lptopen -- reset the printer, then wait until it's selected and not busy. 444 * If LP_BYPASS flag is selected, then we do not try to select the 445 * printer -- this is just used for passing ioctls. 446 */ 447 448 static int 449 lptopen(struct dev_open_args *ap) 450 { 451 cdev_t dev = ap->a_head.a_dev; 452 int trys, err; 453 u_int unit = LPTUNIT(minor(dev)); 454 struct lpt_data *sc = UNITOSOFTC(unit); 455 device_t lptdev = UNITODEVICE(unit); 456 device_t ppbus = device_get_parent(lptdev); 457 458 if (!sc) 459 return (ENXIO); 460 461 if (sc->sc_state) { 462 lprintf((LPT_NAME ": still open %x\n", sc->sc_state)); 463 return(EBUSY); 464 } else 465 sc->sc_state |= LPTINIT; 466 467 sc->sc_flags = LPTFLAGS(minor(dev)); 468 469 /* Check for open with BYPASS flag set. */ 470 if (sc->sc_flags & LP_BYPASS) { 471 sc->sc_state = OPEN; 472 return(0); 473 } 474 475 /* request the ppbus only if we don't have it already */ 476 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 477 /* give it a chance to try later */ 478 sc->sc_state = 0; 479 return (err); 480 } 481 482 crit_enter(); 483 lprintf((LPT_NAME " flags 0x%x\n", sc->sc_flags)); 484 485 /* set IRQ status according to ENABLE_IRQ flag 486 */ 487 if (sc->sc_irq & LP_ENABLE_IRQ) 488 sc->sc_irq |= LP_USE_IRQ; 489 else 490 sc->sc_irq &= ~LP_USE_IRQ; 491 492 /* init printer */ 493 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 494 if((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 495 ppb_wctr(ppbus, 0); 496 sc->sc_primed++; 497 DELAY(500); 498 } 499 } 500 501 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 502 503 /* wait till ready (printer running diagnostics) */ 504 trys = 0; 505 do { 506 /* ran out of waiting for the printer */ 507 if (trys++ >= LPINITRDY*4) { 508 crit_exit(); 509 sc->sc_state = 0; 510 lprintf(("status %x\n", ppb_rstr(ppbus))); 511 512 lpt_release_ppbus(lptdev); 513 return (EBUSY); 514 } 515 516 /* wait 1/4 second, give up if we get a signal */ 517 if (tsleep((caddr_t)lptdev, PCATCH, "lptinit", hz/4) != 518 EWOULDBLOCK) { 519 sc->sc_state = 0; 520 crit_exit(); 521 522 lpt_release_ppbus(lptdev); 523 return (EBUSY); 524 } 525 526 /* is printer online and ready for output */ 527 } while ((ppb_rstr(ppbus) & 528 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 529 (LPS_SEL|LPS_NBSY|LPS_NERR)); 530 531 sc->sc_control = LPC_SEL|LPC_NINIT; 532 if (sc->sc_flags & LP_AUTOLF) 533 sc->sc_control |= LPC_AUTOL; 534 535 /* enable interrupt if interrupt-driven */ 536 if (sc->sc_irq & LP_USE_IRQ) 537 sc->sc_control |= LPC_ENA; 538 539 ppb_wctr(ppbus, sc->sc_control); 540 541 sc->sc_state = OPEN; 542 sc->sc_inbuf = kmalloc(BUFSIZE, M_LPT, M_WAITOK); 543 sc->sc_statbuf = kmalloc(BUFSTATSIZE, M_LPT, M_WAITOK); 544 sc->sc_xfercnt = 0; 545 546 crit_exit(); 547 548 /* release the ppbus */ 549 lpt_release_ppbus(lptdev); 550 551 /* only use timeout if using interrupt */ 552 lprintf(("irq %x\n", sc->sc_irq)); 553 if (sc->sc_irq & LP_USE_IRQ) { 554 sc->sc_state |= TOUT; 555 sc->sc_backoff = hz / LPTOUTINITIAL; 556 callout_reset(&sc->sc_callout, sc->sc_backoff, lptout, lptdev); 557 } 558 559 lprintf(("opened.\n")); 560 return(0); 561 } 562 563 /* 564 * lptclose -- close the device, free the local line buffer. 565 * 566 * Check for interrupted write call added. 567 */ 568 569 static int 570 lptclose(struct dev_close_args *ap) 571 { 572 cdev_t dev = ap->a_head.a_dev; 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((caddr_t)lptdev, PCATCH, 594 "lpclose", hz) != EWOULDBLOCK) { 595 break; 596 } 597 } 598 } 599 callout_stop(&sc->sc_callout); 600 ppb_wctr(ppbus, LPC_NINIT); 601 kfree(sc->sc_inbuf, M_LPT); 602 kfree(sc->sc_statbuf, M_LPT); 603 604 end_close: 605 /* release the bus anyway 606 * unregistration of interrupt forced by release 607 */ 608 lpt_release_ppbus(lptdev); 609 610 sc->sc_state = 0; 611 sc->sc_xfercnt = 0; 612 lprintf(("closed.\n")); 613 return(0); 614 } 615 616 /* 617 * lpt_pushbytes() 618 * Workhorse for actually spinning and writing bytes to printer 619 * Derived from lpa.c 620 * Originally by ? 621 * 622 * This code is only used when we are polling the port 623 */ 624 static int 625 lpt_pushbytes(device_t dev) 626 { 627 struct lpt_data *sc = DEVTOSOFTC(dev); 628 device_t ppbus = device_get_parent(dev); 629 int spin, err, tic; 630 char ch; 631 632 lprintf(("p")); 633 /* loop for every character .. */ 634 while (sc->sc_xfercnt > 0) { 635 /* printer data */ 636 ch = *(sc->sc_cp); 637 sc->sc_cp++; 638 sc->sc_xfercnt--; 639 640 /* 641 * Wait for printer ready. 642 * Loop 20 usecs testing BUSY bit, then sleep 643 * for exponentially increasing timeout. (vak) 644 */ 645 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 646 DELAY(1); /* XXX delay is NOT this accurate! */ 647 if (spin >= MAX_SPIN) { 648 tic = 0; 649 while (NOT_READY(ppbus)) { 650 /* 651 * Now sleep, every cycle a 652 * little longer .. 653 */ 654 tic = tic + tic + 1; 655 /* 656 * But no more than 10 seconds. (vak) 657 */ 658 if (tic > MAX_SLEEP) 659 tic = MAX_SLEEP; 660 err = tsleep((caddr_t)dev, 0, 661 LPT_NAME "poll", tic); 662 if (err != EWOULDBLOCK) { 663 return (err); 664 } 665 } 666 } 667 668 /* output data */ 669 ppb_wdtr(ppbus, ch); 670 /* strobe */ 671 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 672 ppb_wctr(ppbus, sc->sc_control); 673 674 } 675 return(0); 676 } 677 678 /* 679 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 680 */ 681 682 static int 683 lptread(struct dev_read_args *ap) 684 { 685 cdev_t dev = ap->a_head.a_dev; 686 struct uio *uio = ap->a_uio; 687 u_int unit = LPTUNIT(minor(dev)); 688 struct lpt_data *sc = UNITOSOFTC(unit); 689 device_t lptdev = UNITODEVICE(unit); 690 device_t ppbus = device_get_parent(lptdev); 691 int error = 0, len; 692 693 if (sc->sc_flags & LP_BYPASS) { 694 /* we can't do reads in bypass mode */ 695 return (EPERM); 696 } 697 698 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) 699 return (error); 700 701 /* read data in an other buffer, read/write may be simultaneous */ 702 len = 0; 703 while (uio->uio_resid) { 704 error = ppb_1284_read(ppbus, PPB_NIBBLE, sc->sc_statbuf, 705 (int)szmin(BUFSTATSIZE, uio->uio_resid), 706 &len); 707 if (error) 708 goto error; 709 710 if (!len) 711 goto error; /* no more data */ 712 713 if ((error = uiomove(sc->sc_statbuf, (size_t)len, uio))) 714 goto error; 715 } 716 717 error: 718 ppb_1284_terminate(ppbus); 719 return (error); 720 } 721 722 /* 723 * lptwrite --copy a line from user space to a local buffer, then call 724 * putc to get the chars moved to the output queue. 725 * 726 * Flagging of interrupted write added. 727 */ 728 729 static int 730 lptwrite(struct dev_write_args *ap) 731 { 732 cdev_t dev = ap->a_head.a_dev; 733 struct uio *uio = ap->a_uio; 734 unsigned n; 735 int err; 736 u_int unit = LPTUNIT(minor(dev)); 737 struct lpt_data *sc = UNITOSOFTC(unit); 738 device_t lptdev = UNITODEVICE(unit); 739 device_t ppbus = device_get_parent(lptdev); 740 741 if(sc->sc_flags & LP_BYPASS) { 742 /* we can't do writes in bypass mode */ 743 return(EPERM); 744 } 745 746 /* request the ppbus only if we don't have it already */ 747 /* XXX interrupt registration?! */ 748 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) 749 return (err); 750 751 /* if interrupts are working, register the handler */ 752 if (sc->sc_irq & LP_USE_IRQ) { 753 /* register our interrupt handler */ 754 err = BUS_SETUP_INTR(ppbus, lptdev, sc->intr_resource, 755 0, lpt_intr, lptdev, 756 &sc->intr_cookie, NULL); 757 if (err) { 758 device_printf(lptdev, "handler registration failed, polled mode.\n"); 759 sc->sc_irq &= ~LP_USE_IRQ; 760 } 761 } 762 763 sc->sc_state &= ~INTERRUPTED; 764 while ((n = (unsigned)szmin(BUFSIZE, uio->uio_resid)) != 0) { 765 sc->sc_cp = sc->sc_inbuf; 766 uiomove(sc->sc_cp, (size_t)n, uio); 767 sc->sc_xfercnt = n ; 768 769 if (sc->sc_irq & LP_ENABLE_EXT) { 770 /* try any extended mode */ 771 err = ppb_write(ppbus, sc->sc_cp, 772 sc->sc_xfercnt, 0); 773 switch (err) { 774 case 0: 775 /* if not all data was sent, we could rely 776 * on polling for the last bytes */ 777 sc->sc_xfercnt = 0; 778 break; 779 case EINTR: 780 sc->sc_state |= INTERRUPTED; 781 return(err); 782 case EINVAL: 783 /* advanced mode not avail */ 784 log(LOG_NOTICE, LPT_NAME "%d: advanced mode not avail, polling\n", unit); 785 break; 786 default: 787 return(err); 788 } 789 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 790 lprintf(("i")); 791 /* if the printer is ready for a char, */ 792 /* give it one */ 793 if ((sc->sc_state & OBUSY) == 0){ 794 lprintf(("\nC %d. ", sc->sc_xfercnt)); 795 lptintr(lptdev); 796 } 797 lprintf(("W ")); 798 if (sc->sc_state & OBUSY) 799 if ((err = tsleep((caddr_t)lptdev, 800 PCATCH, LPT_NAME "write", 0))) { 801 sc->sc_state |= INTERRUPTED; 802 return(err); 803 } 804 } 805 806 /* check to see if we must do a polled write */ 807 if(!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 808 lprintf(("p")); 809 810 err = lpt_pushbytes(lptdev); 811 812 if (err) 813 return(err); 814 } 815 } 816 817 /* we have not been interrupted, release the ppbus */ 818 lpt_release_ppbus(lptdev); 819 820 return(0); 821 } 822 823 /* 824 * lpt_intr -- handle printer interrupts which occur when the printer is 825 * ready to accept another char. 826 * 827 * do checking for interrupted write call. 828 */ 829 830 static void 831 lpt_intr(void *arg) 832 { 833 device_t lptdev = (device_t)arg; 834 device_t ppbus = device_get_parent(lptdev); 835 struct lpt_data *sc = DEVTOSOFTC(lptdev); 836 int sts = 0; 837 int i; 838 839 /* we must own the bus to use it */ 840 if ((sc->sc_state & HAVEBUS) == 0) 841 return; 842 843 /* 844 * Is printer online and ready for output? 845 * 846 * Avoid falling back to lptout() too quickly. First spin-loop 847 * to see if the printer will become ready ``really soon now''. 848 */ 849 for (i = 0; i < 100 && 850 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 851 852 if ((sts & RDY_MASK) == LP_READY) { 853 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 854 sc->sc_backoff = hz/LPTOUTINITIAL; 855 856 if (sc->sc_xfercnt) { 857 /* send char */ 858 /*lprintf(("%x ", *sc->sc_cp)); */ 859 ppb_wdtr(ppbus, *sc->sc_cp++) ; 860 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 861 /* DELAY(X) */ 862 ppb_wctr(ppbus, sc->sc_control); 863 864 /* any more data for printer */ 865 if(--(sc->sc_xfercnt) > 0) return; 866 } 867 868 /* 869 * No more data waiting for printer. 870 * Wakeup is not done if write call was not interrupted. 871 */ 872 sc->sc_state &= ~OBUSY; 873 874 if(!(sc->sc_state & INTERRUPTED)) 875 wakeup((caddr_t)lptdev); 876 lprintf(("w ")); 877 return; 878 } else { /* check for error */ 879 if(((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 880 (sc->sc_state & OPEN)) 881 sc->sc_state |= EERROR; 882 /* lptout() will jump in and try to restart. */ 883 } 884 lprintf(("sts %x ", sts)); 885 } 886 887 static void 888 lptintr(device_t dev) 889 { 890 /* call the interrupt at required spl level */ 891 crit_enter(); 892 893 lpt_intr(dev); 894 895 crit_exit(); 896 } 897 898 static int 899 lptioctl(struct dev_ioctl_args *ap) 900 { 901 cdev_t dev = ap->a_head.a_dev; 902 int error = 0; 903 u_int unit = LPTUNIT(minor(dev)); 904 struct lpt_data *sc = UNITOSOFTC(unit); 905 u_char old_sc_irq; /* old printer IRQ status */ 906 907 switch (ap->a_cmd) { 908 case LPT_IRQ : 909 if(sc->sc_irq & LP_HAS_IRQ) { 910 /* 911 * NOTE: 912 * If the IRQ status is changed, 913 * this will only be visible on the 914 * next open. 915 * 916 * If interrupt status changes, 917 * this gets syslog'd. 918 */ 919 old_sc_irq = sc->sc_irq; 920 switch(*(int*)ap->a_data) { 921 case 0: 922 sc->sc_irq &= (~LP_ENABLE_IRQ); 923 break; 924 case 1: 925 sc->sc_irq &= (~LP_ENABLE_EXT); 926 sc->sc_irq |= LP_ENABLE_IRQ; 927 break; 928 case 2: 929 /* classic irq based transfer and advanced 930 * modes are in conflict 931 */ 932 sc->sc_irq &= (~LP_ENABLE_IRQ); 933 sc->sc_irq |= LP_ENABLE_EXT; 934 break; 935 case 3: 936 sc->sc_irq &= (~LP_ENABLE_EXT); 937 break; 938 default: 939 break; 940 } 941 942 if (old_sc_irq != sc->sc_irq ) 943 log(LOG_NOTICE, LPT_NAME "%d: switched to %s %s mode\n", 944 unit, 945 (sc->sc_irq & LP_ENABLE_IRQ)? 946 "interrupt-driven":"polled", 947 (sc->sc_irq & LP_ENABLE_EXT)? 948 "extended":"standard"); 949 } else /* polled port */ 950 error = EOPNOTSUPP; 951 break; 952 default: 953 error = ENODEV; 954 } 955 956 return(error); 957 } 958 959 /* 960 * Because lpt is a static device that always exists under a ppbus device, 961 * and not scanned by the ppbus device, we need an identify function to 962 * install its device. 963 */ 964 static device_method_t lpt_methods[] = { 965 /* device interface */ 966 DEVMETHOD(device_identify, bus_generic_identify), 967 DEVMETHOD(device_probe, lpt_probe), 968 DEVMETHOD(device_attach, lpt_attach), 969 970 { 0, 0 } 971 }; 972 973 static driver_t lpt_driver = { 974 LPT_NAME, 975 lpt_methods, 976 sizeof(struct lpt_data), 977 }; 978 979 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 980 981