1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1990 William F. Jolitz, TeleMuse 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This software is a component of "386BSD" developed by 18 * William F. Jolitz, TeleMuse. 19 * 4. Neither the name of the developer nor the name "386BSD" 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 24 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 25 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 26 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 27 * NOT MAKE USE OF THIS WORK. 28 * 29 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 30 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 31 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 32 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 33 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 34 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 35 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 36 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 37 * 38 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 39 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 41 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 42 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 43 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 44 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 45 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 46 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 47 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 48 * SUCH DAMAGE. 49 * 50 * from: unknown origin, 386BSD 0.1 51 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp 52 * From Id: nlpt.c,v 1.14 1999/02/08 13:55:43 des Exp 53 */ 54 55 #include <sys/cdefs.h> 56 __FBSDID("$FreeBSD$"); 57 58 /* 59 * Device Driver for AT parallel printer port 60 * Written by William Jolitz 12/18/90 61 */ 62 63 /* 64 * Updated for ppbus by Nicolas Souchu 65 * [Mon Jul 28 1997] 66 */ 67 68 #include "opt_lpt.h" 69 70 #include <sys/param.h> 71 #include <sys/systm.h> 72 #include <sys/module.h> 73 #include <sys/bus.h> 74 #include <sys/conf.h> 75 #include <sys/kernel.h> 76 #include <sys/uio.h> 77 #include <sys/syslog.h> 78 #include <sys/malloc.h> 79 80 #include <machine/bus.h> 81 #include <machine/resource.h> 82 #include <sys/rman.h> 83 84 #include <dev/ppbus/lptio.h> 85 #include <dev/ppbus/ppbconf.h> 86 #include <dev/ppbus/ppb_1284.h> 87 #include <dev/ppbus/lpt.h> 88 #include "ppbus_if.h" 89 #include <dev/ppbus/ppbio.h> 90 91 #ifndef LPT_DEBUG 92 #define lprintf(args) 93 #else 94 #define lprintf(args) \ 95 do { \ 96 if (lptflag) \ 97 printf 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 LPPRI (PZERO+8) 106 #define BUFSIZE 1024 107 #define BUFSTATSIZE 32 108 109 struct lpt_data { 110 device_t sc_dev; 111 struct cdev *sc_cdev; 112 struct cdev *sc_cdev_bypass; 113 short sc_state; 114 /* default case: negative prime, negative ack, handshake strobe, 115 prime once */ 116 u_char sc_control; 117 char sc_flags; 118 #define LP_POS_INIT 0x04 /* if we are a positive 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 struct callout sc_timer; 136 137 struct resource *sc_intr_resource; /* interrupt resource */ 138 void *sc_intr_cookie; /* interrupt cookie */ 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)) 149 150 static void lptintr(void *arg); 151 152 static devclass_t lpt_devclass; 153 154 155 /* bits for state */ 156 #define OPEN (1<<0) /* device is open */ 157 #define ASLP (1<<1) /* awaiting draining of printer */ 158 #define EERROR (1<<2) /* error was received from printer */ 159 #define OBUSY (1<<3) /* printer is busy doing output */ 160 #define LPTOUT (1<<4) /* timeout while not selected */ 161 #define TOUT (1<<5) /* timeout while not selected */ 162 #define LPTINIT (1<<6) /* waiting to initialize for open */ 163 #define INTERRUPTED (1<<7) /* write call was interrupted */ 164 #define HAVEBUS (1<<8) /* the driver owns the bus */ 165 166 /* status masks to interrogate printer status */ 167 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 168 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 169 170 /* Printer Ready condition - from lpa.c */ 171 /* Only used in polling code */ 172 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 173 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 174 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 175 176 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 177 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 178 179 180 static d_open_t lptopen; 181 static d_close_t lptclose; 182 static d_write_t lptwrite; 183 static d_read_t lptread; 184 static d_ioctl_t lptioctl; 185 186 static struct cdevsw lpt_cdevsw = { 187 .d_version = D_VERSION, 188 .d_open = lptopen, 189 .d_close = lptclose, 190 .d_read = lptread, 191 .d_write = lptwrite, 192 .d_ioctl = lptioctl, 193 .d_name = LPT_NAME, 194 }; 195 196 static int 197 lpt_request_ppbus(device_t dev, int how) 198 { 199 device_t ppbus = device_get_parent(dev); 200 struct lpt_data *sc = DEVTOSOFTC(dev); 201 int error; 202 203 /* 204 * We might already have the bus for a write(2) after an interrupted 205 * write(2) call. 206 */ 207 ppb_assert_locked(ppbus); 208 if (sc->sc_state & HAVEBUS) 209 return (0); 210 211 error = ppb_request_bus(ppbus, dev, how); 212 if (error == 0) 213 sc->sc_state |= HAVEBUS; 214 return (error); 215 } 216 217 static int 218 lpt_release_ppbus(device_t dev) 219 { 220 device_t ppbus = device_get_parent(dev); 221 struct lpt_data *sc = DEVTOSOFTC(dev); 222 int error = 0; 223 224 ppb_assert_locked(ppbus); 225 if (sc->sc_state & HAVEBUS) { 226 error = ppb_release_bus(ppbus, dev); 227 if (error == 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 ppb_lock(ppbus); 318 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 319 ppb_unlock(ppbus); 320 device_printf(dev, "cannot alloc ppbus (%d)!\n", error); 321 return (0); 322 } 323 324 for (i = 0; i < 18 && status; i++) 325 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 326 status = 0; 327 break; 328 } 329 330 /* 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 ppb_unlock(ppbus); 336 337 return (status); 338 } 339 340 static void 341 lpt_identify(driver_t *driver, device_t parent) 342 { 343 344 device_t dev; 345 346 dev = device_find_child(parent, LPT_NAME, -1); 347 if (!dev) 348 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1); 349 } 350 351 /* 352 * lpt_probe() 353 */ 354 static int 355 lpt_probe(device_t dev) 356 { 357 358 if (!lpt_detect(dev)) 359 return (ENXIO); 360 361 device_set_desc(dev, "Printer"); 362 363 return (0); 364 } 365 366 static int 367 lpt_attach(device_t dev) 368 { 369 device_t ppbus = device_get_parent(dev); 370 struct lpt_data *sc = DEVTOSOFTC(dev); 371 int rid = 0, unit = device_get_unit(dev); 372 int error; 373 374 sc->sc_primed = 0; /* not primed yet */ 375 ppb_init_callout(ppbus, &sc->sc_timer, 0); 376 377 ppb_lock(ppbus); 378 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 379 ppb_unlock(ppbus); 380 device_printf(dev, "cannot alloc ppbus (%d)!\n", error); 381 return (0); 382 } 383 384 ppb_wctr(ppbus, LPC_NINIT); 385 lpt_release_ppbus(dev); 386 ppb_unlock(ppbus); 387 388 /* declare our interrupt handler */ 389 sc->sc_intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 390 RF_SHAREABLE); 391 if (sc->sc_intr_resource) { 392 error = bus_setup_intr(dev, sc->sc_intr_resource, 393 INTR_TYPE_TTY | INTR_MPSAFE, NULL, lptintr, sc, 394 &sc->sc_intr_cookie); 395 if (error) { 396 bus_release_resource(dev, SYS_RES_IRQ, rid, 397 sc->sc_intr_resource); 398 device_printf(dev, 399 "Unable to register interrupt handler\n"); 400 return (error); 401 } 402 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 403 device_printf(dev, "Interrupt-driven port\n"); 404 } else { 405 sc->sc_irq = 0; 406 device_printf(dev, "Polled port\n"); 407 } 408 lprintf(("irq %x\n", sc->sc_irq)); 409 410 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 411 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK); 412 sc->sc_dev = dev; 413 sc->sc_cdev = make_dev(&lpt_cdevsw, unit, 414 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 415 sc->sc_cdev->si_drv1 = sc; 416 sc->sc_cdev->si_drv2 = 0; 417 sc->sc_cdev_bypass = make_dev(&lpt_cdevsw, unit, 418 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 419 sc->sc_cdev_bypass->si_drv1 = sc; 420 sc->sc_cdev_bypass->si_drv2 = (void *)LP_BYPASS; 421 return (0); 422 } 423 424 static int 425 lpt_detach(device_t dev) 426 { 427 struct lpt_data *sc = DEVTOSOFTC(dev); 428 device_t ppbus = device_get_parent(dev); 429 430 destroy_dev(sc->sc_cdev); 431 destroy_dev(sc->sc_cdev_bypass); 432 ppb_lock(ppbus); 433 lpt_release_ppbus(dev); 434 ppb_unlock(ppbus); 435 callout_drain(&sc->sc_timer); 436 if (sc->sc_intr_resource != NULL) { 437 bus_teardown_intr(dev, sc->sc_intr_resource, 438 sc->sc_intr_cookie); 439 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_intr_resource); 440 } 441 free(sc->sc_inbuf, M_DEVBUF); 442 free(sc->sc_statbuf, M_DEVBUF); 443 444 return (0); 445 } 446 447 static void 448 lptout(void *arg) 449 { 450 struct lpt_data *sc = arg; 451 device_t dev = sc->sc_dev; 452 device_t ppbus; 453 454 ppbus = device_get_parent(dev); 455 ppb_assert_locked(ppbus); 456 lprintf(("T %x ", ppb_rstr(ppbus))); 457 if (sc->sc_state & OPEN) { 458 sc->sc_backoff++; 459 if (sc->sc_backoff > hz/LPTOUTMAX) 460 sc->sc_backoff = hz/LPTOUTMAX; 461 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc); 462 } else 463 sc->sc_state &= ~TOUT; 464 465 if (sc->sc_state & EERROR) 466 sc->sc_state &= ~EERROR; 467 468 /* 469 * Avoid possible hangs due to missed interrupts 470 */ 471 if (sc->sc_xfercnt) { 472 lptintr(sc); 473 } else { 474 sc->sc_state &= ~OBUSY; 475 wakeup(dev); 476 } 477 } 478 479 /* 480 * lptopen -- reset the printer, then wait until it's selected and not busy. 481 * If LP_BYPASS flag is selected, then we do not try to select the 482 * printer -- this is just used for passing ioctls. 483 */ 484 485 static int 486 lptopen(struct cdev *dev, int flags, int fmt, struct thread *td) 487 { 488 int trys, err; 489 struct lpt_data *sc = dev->si_drv1; 490 device_t lptdev; 491 device_t ppbus; 492 493 if (!sc) 494 return (ENXIO); 495 496 lptdev = sc->sc_dev; 497 ppbus = device_get_parent(lptdev); 498 499 ppb_lock(ppbus); 500 if (sc->sc_state) { 501 lprintf(("%s: still open %x\n", device_get_nameunit(lptdev), 502 sc->sc_state)); 503 ppb_unlock(ppbus); 504 return(EBUSY); 505 } else 506 sc->sc_state |= LPTINIT; 507 508 sc->sc_flags = (uintptr_t)dev->si_drv2; 509 510 /* Check for open with BYPASS flag set. */ 511 if (sc->sc_flags & LP_BYPASS) { 512 sc->sc_state = OPEN; 513 ppb_unlock(ppbus); 514 return(0); 515 } 516 517 /* request the ppbus only if we don't have it already */ 518 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 519 /* give it a chance to try later */ 520 sc->sc_state = 0; 521 ppb_unlock(ppbus); 522 return (err); 523 } 524 525 lprintf(("%s flags 0x%x\n", device_get_nameunit(lptdev), 526 sc->sc_flags)); 527 528 /* set IRQ status according to ENABLE_IRQ flag 529 */ 530 if (sc->sc_irq & LP_ENABLE_IRQ) 531 sc->sc_irq |= LP_USE_IRQ; 532 else 533 sc->sc_irq &= ~LP_USE_IRQ; 534 535 /* init printer */ 536 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 537 if ((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 538 ppb_wctr(ppbus, 0); 539 sc->sc_primed++; 540 DELAY(500); 541 } 542 } 543 544 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 545 546 /* wait till ready (printer running diagnostics) */ 547 trys = 0; 548 do { 549 /* ran out of waiting for the printer */ 550 if (trys++ >= LPINITRDY*4) { 551 lprintf(("status %x\n", ppb_rstr(ppbus))); 552 553 lpt_release_ppbus(lptdev); 554 sc->sc_state = 0; 555 ppb_unlock(ppbus); 556 return (EBUSY); 557 } 558 559 /* wait 1/4 second, give up if we get a signal */ 560 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lptinit", 561 hz / 4) != EWOULDBLOCK) { 562 lpt_release_ppbus(lptdev); 563 sc->sc_state = 0; 564 ppb_unlock(ppbus); 565 return (EBUSY); 566 } 567 568 /* is printer online and ready for output */ 569 } while ((ppb_rstr(ppbus) & 570 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 571 (LPS_SEL|LPS_NBSY|LPS_NERR)); 572 573 sc->sc_control = LPC_SEL|LPC_NINIT; 574 if (sc->sc_flags & LP_AUTOLF) 575 sc->sc_control |= LPC_AUTOL; 576 577 /* enable interrupt if interrupt-driven */ 578 if (sc->sc_irq & LP_USE_IRQ) 579 sc->sc_control |= LPC_ENA; 580 581 ppb_wctr(ppbus, sc->sc_control); 582 583 sc->sc_state &= ~LPTINIT; 584 sc->sc_state |= OPEN; 585 sc->sc_xfercnt = 0; 586 587 /* only use timeout if using interrupt */ 588 lprintf(("irq %x\n", sc->sc_irq)); 589 if (sc->sc_irq & LP_USE_IRQ) { 590 sc->sc_state |= TOUT; 591 sc->sc_backoff = hz / LPTOUTINITIAL; 592 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc); 593 } 594 595 /* release the ppbus */ 596 lpt_release_ppbus(lptdev); 597 ppb_unlock(ppbus); 598 599 lprintf(("opened.\n")); 600 return(0); 601 } 602 603 /* 604 * lptclose -- close the device, free the local line buffer. 605 * 606 * Check for interrupted write call added. 607 */ 608 609 static int 610 lptclose(struct cdev *dev, int flags, int fmt, struct thread *td) 611 { 612 struct lpt_data *sc = dev->si_drv1; 613 device_t lptdev = sc->sc_dev; 614 device_t ppbus = device_get_parent(lptdev); 615 int err; 616 617 ppb_lock(ppbus); 618 if (sc->sc_flags & LP_BYPASS) 619 goto end_close; 620 621 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 622 ppb_unlock(ppbus); 623 return (err); 624 } 625 626 /* if the last write was interrupted, don't complete it */ 627 if ((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 628 while ((ppb_rstr(ppbus) & 629 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 630 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 631 /* wait 1 second, give up if we get a signal */ 632 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lpclose", 633 hz) != EWOULDBLOCK) 634 break; 635 636 sc->sc_state &= ~OPEN; 637 callout_stop(&sc->sc_timer); 638 ppb_wctr(ppbus, LPC_NINIT); 639 640 /* 641 * unregistration of interrupt forced by release 642 */ 643 lpt_release_ppbus(lptdev); 644 645 end_close: 646 sc->sc_state = 0; 647 sc->sc_xfercnt = 0; 648 ppb_unlock(ppbus); 649 lprintf(("closed.\n")); 650 return(0); 651 } 652 653 /* 654 * lpt_pushbytes() 655 * Workhorse for actually spinning and writing bytes to printer 656 * Derived from lpa.c 657 * Originally by ? 658 * 659 * This code is only used when we are polling the port 660 */ 661 static int 662 lpt_pushbytes(struct lpt_data *sc) 663 { 664 device_t dev = sc->sc_dev; 665 device_t ppbus = device_get_parent(dev); 666 int spin, err, tic; 667 char ch; 668 669 ppb_assert_locked(ppbus); 670 lprintf(("p")); 671 /* loop for every character .. */ 672 while (sc->sc_xfercnt > 0) { 673 /* printer data */ 674 ch = *(sc->sc_cp); 675 sc->sc_cp++; 676 sc->sc_xfercnt--; 677 678 /* 679 * Wait for printer ready. 680 * Loop 20 usecs testing BUSY bit, then sleep 681 * for exponentially increasing timeout. (vak) 682 */ 683 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 684 DELAY(1); /* XXX delay is NOT this accurate! */ 685 if (spin >= MAX_SPIN) { 686 tic = 0; 687 while (NOT_READY(ppbus)) { 688 /* 689 * Now sleep, every cycle a 690 * little longer .. 691 */ 692 tic = tic + tic + 1; 693 /* 694 * But no more than 10 seconds. (vak) 695 */ 696 if (tic > MAX_SLEEP) 697 tic = MAX_SLEEP; 698 err = ppb_sleep(ppbus, dev, LPPRI, 699 LPT_NAME "poll", tic); 700 if (err != EWOULDBLOCK) { 701 return (err); 702 } 703 } 704 } 705 706 /* output data */ 707 ppb_wdtr(ppbus, ch); 708 /* strobe */ 709 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 710 ppb_wctr(ppbus, sc->sc_control); 711 712 } 713 return(0); 714 } 715 716 /* 717 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 718 */ 719 720 static int 721 lptread(struct cdev *dev, struct uio *uio, int ioflag) 722 { 723 struct lpt_data *sc = dev->si_drv1; 724 device_t lptdev = sc->sc_dev; 725 device_t ppbus = device_get_parent(lptdev); 726 int error = 0, len; 727 728 if (sc->sc_flags & LP_BYPASS) { 729 /* we can't do reads in bypass mode */ 730 return (EPERM); 731 } 732 733 ppb_lock(ppbus); 734 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) { 735 ppb_unlock(ppbus); 736 return (error); 737 } 738 739 /* read data in an other buffer, read/write may be simultaneous */ 740 len = 0; 741 while (uio->uio_resid) { 742 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 743 sc->sc_statbuf, min(BUFSTATSIZE, 744 uio->uio_resid), &len))) { 745 goto error; 746 } 747 748 if (!len) 749 goto error; /* no more data */ 750 751 ppb_unlock(ppbus); 752 error = uiomove(sc->sc_statbuf, len, uio); 753 ppb_lock(ppbus); 754 if (error) 755 goto error; 756 } 757 758 error: 759 ppb_1284_terminate(ppbus); 760 ppb_unlock(ppbus); 761 return (error); 762 } 763 764 /* 765 * lptwrite --copy a line from user space to a local buffer, then call 766 * putc to get the chars moved to the output queue. 767 * 768 * Flagging of interrupted write added. 769 */ 770 771 static int 772 lptwrite(struct cdev *dev, struct uio *uio, int ioflag) 773 { 774 register unsigned n; 775 int err; 776 struct lpt_data *sc = dev->si_drv1; 777 device_t lptdev = sc->sc_dev; 778 device_t ppbus = device_get_parent(lptdev); 779 780 if (sc->sc_flags & LP_BYPASS) { 781 /* we can't do writes in bypass mode */ 782 return (EPERM); 783 } 784 785 /* request the ppbus only if we don't have it already */ 786 ppb_lock(ppbus); 787 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 788 ppb_unlock(ppbus); 789 return (err); 790 } 791 792 sc->sc_state &= ~INTERRUPTED; 793 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 794 sc->sc_cp = sc->sc_inbuf; 795 ppb_unlock(ppbus); 796 err = uiomove(sc->sc_cp, n, uio); 797 ppb_lock(ppbus); 798 if (err) 799 break; 800 sc->sc_xfercnt = n; 801 802 if (sc->sc_irq & LP_ENABLE_EXT) { 803 /* try any extended mode */ 804 err = ppb_write(ppbus, sc->sc_cp, 805 sc->sc_xfercnt, 0); 806 switch (err) { 807 case 0: 808 /* if not all data was sent, we could rely 809 * on polling for the last bytes */ 810 sc->sc_xfercnt = 0; 811 break; 812 case EINTR: 813 sc->sc_state |= INTERRUPTED; 814 ppb_unlock(ppbus); 815 return (err); 816 case EINVAL: 817 /* advanced mode not avail */ 818 log(LOG_NOTICE, 819 "%s: advanced mode not avail, polling\n", 820 device_get_nameunit(sc->sc_dev)); 821 break; 822 default: 823 ppb_unlock(ppbus); 824 return (err); 825 } 826 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 827 lprintf(("i")); 828 /* if the printer is ready for a char, */ 829 /* give it one */ 830 if ((sc->sc_state & OBUSY) == 0){ 831 lprintf(("\nC %d. ", sc->sc_xfercnt)); 832 lptintr(sc); 833 } 834 lprintf(("W ")); 835 if (sc->sc_state & OBUSY) 836 if ((err = ppb_sleep(ppbus, lptdev, 837 LPPRI|PCATCH, LPT_NAME "write", 0))) { 838 sc->sc_state |= INTERRUPTED; 839 ppb_unlock(ppbus); 840 return(err); 841 } 842 } 843 844 /* check to see if we must do a polled write */ 845 if (!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 846 lprintf(("p")); 847 848 err = lpt_pushbytes(sc); 849 850 if (err) { 851 ppb_unlock(ppbus); 852 return (err); 853 } 854 } 855 } 856 857 /* we have not been interrupted, release the ppbus */ 858 lpt_release_ppbus(lptdev); 859 ppb_unlock(ppbus); 860 861 return (err); 862 } 863 864 /* 865 * lptintr -- handle printer interrupts which occur when the printer is 866 * ready to accept another char. 867 * 868 * do checking for interrupted write call. 869 */ 870 static void 871 lptintr(void *arg) 872 { 873 struct lpt_data *sc = arg; 874 device_t lptdev = sc->sc_dev; 875 device_t ppbus = device_get_parent(lptdev); 876 int sts = 0; 877 int i; 878 879 /* 880 * Is printer online and ready for output? 881 * 882 * Avoid falling back to lptout() too quickly. First spin-loop 883 * to see if the printer will become ready ``really soon now''. 884 */ 885 for (i = 0; i < 100 && 886 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 887 888 if ((sts & RDY_MASK) == LP_READY) { 889 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 890 sc->sc_backoff = hz / LPTOUTINITIAL; 891 892 if (sc->sc_xfercnt) { 893 /* send char */ 894 /*lprintf(("%x ", *sc->sc_cp)); */ 895 ppb_wdtr(ppbus, *sc->sc_cp++) ; 896 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 897 /* DELAY(X) */ 898 ppb_wctr(ppbus, sc->sc_control); 899 900 /* any more data for printer */ 901 if (--(sc->sc_xfercnt) > 0) 902 return; 903 } 904 905 /* 906 * No more data waiting for printer. 907 * Wakeup is not done if write call was not interrupted. 908 */ 909 sc->sc_state &= ~OBUSY; 910 911 if (!(sc->sc_state & INTERRUPTED)) 912 wakeup(lptdev); 913 lprintf(("w ")); 914 return; 915 } else { /* check for error */ 916 if (((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 917 (sc->sc_state & OPEN)) 918 sc->sc_state |= EERROR; 919 /* lptout() will jump in and try to restart. */ 920 } 921 lprintf(("sts %x ", sts)); 922 } 923 924 static int 925 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 926 { 927 int error = 0; 928 struct lpt_data *sc = dev->si_drv1; 929 device_t ppbus; 930 u_char old_sc_irq; /* old printer IRQ status */ 931 932 switch (cmd) { 933 case LPT_IRQ : 934 ppbus = device_get_parent(sc->sc_dev); 935 ppb_lock(ppbus); 936 if (sc->sc_irq & LP_HAS_IRQ) { 937 /* 938 * NOTE: 939 * If the IRQ status is changed, 940 * this will only be visible on the 941 * next open. 942 * 943 * If interrupt status changes, 944 * this gets syslog'd. 945 */ 946 old_sc_irq = sc->sc_irq; 947 switch (*(int*)data) { 948 case 0: 949 sc->sc_irq &= (~LP_ENABLE_IRQ); 950 break; 951 case 1: 952 sc->sc_irq &= (~LP_ENABLE_EXT); 953 sc->sc_irq |= LP_ENABLE_IRQ; 954 break; 955 case 2: 956 /* classic irq based transfer and advanced 957 * modes are in conflict 958 */ 959 sc->sc_irq &= (~LP_ENABLE_IRQ); 960 sc->sc_irq |= LP_ENABLE_EXT; 961 break; 962 case 3: 963 sc->sc_irq &= (~LP_ENABLE_EXT); 964 break; 965 default: 966 break; 967 } 968 969 if (old_sc_irq != sc->sc_irq ) 970 log(LOG_NOTICE, "%s: switched to %s %s mode\n", 971 device_get_nameunit(sc->sc_dev), 972 (sc->sc_irq & LP_ENABLE_IRQ)? 973 "interrupt-driven":"polled", 974 (sc->sc_irq & LP_ENABLE_EXT)? 975 "extended":"standard"); 976 } else /* polled port */ 977 error = EOPNOTSUPP; 978 ppb_unlock(ppbus); 979 break; 980 default: 981 error = ENODEV; 982 } 983 984 return(error); 985 } 986 987 static device_method_t lpt_methods[] = { 988 /* device interface */ 989 DEVMETHOD(device_identify, lpt_identify), 990 DEVMETHOD(device_probe, lpt_probe), 991 DEVMETHOD(device_attach, lpt_attach), 992 DEVMETHOD(device_detach, lpt_detach), 993 994 { 0, 0 } 995 }; 996 997 static driver_t lpt_driver = { 998 LPT_NAME, 999 lpt_methods, 1000 sizeof(struct lpt_data), 1001 }; 1002 1003 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 1004 MODULE_DEPEND(lpt, ppbus, 1, 1, 1); 1005