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 /* 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 struct lpt_data { 108 device_t sc_dev; 109 struct cdev *sc_cdev; 110 struct cdev *sc_cdev_bypass; 111 short sc_state; 112 /* default case: negative prime, negative ack, handshake strobe, 113 prime once */ 114 u_char sc_control; 115 char sc_flags; 116 #define LP_POS_INIT 0x04 /* if we are a positive init signal */ 117 #define LP_POS_ACK 0x08 /* if we are a positive going ack */ 118 #define LP_NO_PRIME 0x10 /* don't prime the printer at all */ 119 #define LP_PRIMEOPEN 0x20 /* prime on every open */ 120 #define LP_AUTOLF 0x40 /* tell printer to do an automatic lf */ 121 #define LP_BYPASS 0x80 /* bypass printer ready checks */ 122 void *sc_inbuf; 123 void *sc_statbuf; 124 short sc_xfercnt ; 125 char sc_primed; 126 char *sc_cp ; 127 u_short sc_irq ; /* IRQ status of port */ 128 #define LP_HAS_IRQ 0x01 /* we have an irq available */ 129 #define LP_USE_IRQ 0x02 /* we are using our irq */ 130 #define LP_ENABLE_IRQ 0x04 /* enable IRQ on open */ 131 #define LP_ENABLE_EXT 0x10 /* we shall use advanced mode when possible */ 132 u_char sc_backoff ; /* time to call lptout() again */ 133 struct callout sc_timer; 134 135 struct resource *sc_intr_resource; /* interrupt resource */ 136 void *sc_intr_cookie; /* interrupt cookie */ 137 }; 138 139 #define LPT_NAME "lpt" /* our official name */ 140 141 static callout_func_t lptout; 142 static int lpt_port_test(device_t dev, u_char data, u_char mask); 143 static int lpt_detect(device_t dev); 144 145 #define DEVTOSOFTC(dev) \ 146 ((struct lpt_data *)device_get_softc(dev)) 147 148 static void lptintr(void *arg); 149 150 /* bits for state */ 151 #define OPEN (1<<0) /* device is open */ 152 #define ASLP (1<<1) /* awaiting draining of printer */ 153 #define EERROR (1<<2) /* error was received from printer */ 154 #define OBUSY (1<<3) /* printer is busy doing output */ 155 #define LPTOUT (1<<4) /* timeout while not selected */ 156 #define TOUT (1<<5) /* timeout while not selected */ 157 #define LPTINIT (1<<6) /* waiting to initialize for open */ 158 #define INTERRUPTED (1<<7) /* write call was interrupted */ 159 #define HAVEBUS (1<<8) /* the driver owns the bus */ 160 161 /* status masks to interrogate printer status */ 162 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 163 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 164 165 /* Printer Ready condition - from lpa.c */ 166 /* Only used in polling code */ 167 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 168 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 169 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 170 171 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 172 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 173 174 static d_open_t lptopen; 175 static d_close_t lptclose; 176 static d_write_t lptwrite; 177 static d_read_t lptread; 178 static d_ioctl_t lptioctl; 179 180 static struct cdevsw lpt_cdevsw = { 181 .d_version = D_VERSION, 182 .d_open = lptopen, 183 .d_close = lptclose, 184 .d_read = lptread, 185 .d_write = lptwrite, 186 .d_ioctl = lptioctl, 187 .d_name = LPT_NAME, 188 }; 189 190 static int 191 lpt_request_ppbus(device_t dev, int how) 192 { 193 device_t ppbus = device_get_parent(dev); 194 struct lpt_data *sc = DEVTOSOFTC(dev); 195 int error; 196 197 /* 198 * We might already have the bus for a write(2) after an interrupted 199 * write(2) call. 200 */ 201 ppb_assert_locked(ppbus); 202 if (sc->sc_state & HAVEBUS) 203 return (0); 204 205 error = ppb_request_bus(ppbus, dev, how); 206 if (error == 0) 207 sc->sc_state |= HAVEBUS; 208 return (error); 209 } 210 211 static int 212 lpt_release_ppbus(device_t dev) 213 { 214 device_t ppbus = device_get_parent(dev); 215 struct lpt_data *sc = DEVTOSOFTC(dev); 216 int error = 0; 217 218 ppb_assert_locked(ppbus); 219 if (sc->sc_state & HAVEBUS) { 220 error = ppb_release_bus(ppbus, dev); 221 if (error == 0) 222 sc->sc_state &= ~HAVEBUS; 223 } 224 return (error); 225 } 226 227 /* 228 * Internal routine to lptprobe to do port tests of one byte value 229 */ 230 static int 231 lpt_port_test(device_t ppbus, u_char data, u_char mask) 232 { 233 int temp, timeout; 234 235 data = data & mask; 236 ppb_wdtr(ppbus, data); 237 timeout = 10000; 238 do { 239 DELAY(10); 240 temp = ppb_rdtr(ppbus) & mask; 241 } 242 while (temp != data && --timeout); 243 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 244 return (temp == data); 245 } 246 247 /* 248 * Probe simplified by replacing multiple loops with a hardcoded 249 * test pattern - 1999/02/08 des@freebsd.org 250 * 251 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 252 * Based partially on Rod Grimes' printer probe 253 * 254 * Logic: 255 * 1) If no port address was given, use the bios detected ports 256 * and autodetect what ports the printers are on. 257 * 2) Otherwise, probe the data port at the address given, 258 * using the method in Rod Grimes' port probe. 259 * (Much code ripped off directly from Rod's probe.) 260 * 261 * Comments from Rod's probe: 262 * Logic: 263 * 1) You should be able to write to and read back the same value 264 * to the data port. Do an alternating zeros, alternating ones, 265 * walking zero, and walking one test to check for stuck bits. 266 * 267 * 2) You should be able to write to and read back the same value 268 * to the control port lower 5 bits, the upper 3 bits are reserved 269 * per the IBM PC technical reference manuals and different boards 270 * do different things with them. Do an alternating zeros, alternating 271 * ones, walking zero, and walking one test to check for stuck bits. 272 * 273 * Some printers drag the strobe line down when the are powered off 274 * so this bit has been masked out of the control port test. 275 * 276 * XXX Some printers may not like a fast pulse on init or strobe, I 277 * don't know at this point, if that becomes a problem these bits 278 * should be turned off in the mask byte for the control port test. 279 * 280 * We are finally left with a mask of 0x14, due to some printers 281 * being adamant about holding other bits high ........ 282 * 283 * Before probing the control port, we write a 0 to the data port - 284 * If not, some printers chuck out garbage when the strobe line 285 * gets toggled. 286 * 287 * 3) Set the data and control ports to a value of 0 288 * 289 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 290 * Epson FX-1170 and C.Itoh 8510RM 291 * printers. 292 * Quick exit on fail added. 293 */ 294 static int 295 lpt_detect(device_t dev) 296 { 297 device_t ppbus = device_get_parent(dev); 298 299 static u_char testbyte[18] = { 300 0x55, /* alternating zeros */ 301 0xaa, /* alternating ones */ 302 0xfe, 0xfd, 0xfb, 0xf7, 303 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 304 0x01, 0x02, 0x04, 0x08, 305 0x10, 0x20, 0x40, 0x80 /* walking one */ 306 }; 307 int i, error, status; 308 309 status = 1; /* assume success */ 310 311 ppb_lock(ppbus); 312 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 313 ppb_unlock(ppbus); 314 device_printf(dev, "cannot alloc ppbus (%d)!\n", error); 315 return (0); 316 } 317 318 for (i = 0; i < 18 && status; i++) 319 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 320 status = 0; 321 break; 322 } 323 324 /* write 0's to control and data ports */ 325 ppb_wdtr(ppbus, 0); 326 ppb_wctr(ppbus, 0); 327 328 lpt_release_ppbus(dev); 329 ppb_unlock(ppbus); 330 331 return (status); 332 } 333 334 static void 335 lpt_identify(driver_t *driver, device_t parent) 336 { 337 338 device_t dev; 339 340 dev = device_find_child(parent, LPT_NAME, -1); 341 if (!dev) 342 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1); 343 } 344 345 /* 346 * lpt_probe() 347 */ 348 static int 349 lpt_probe(device_t dev) 350 { 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 rid = 0, unit = device_get_unit(dev); 366 int error; 367 368 sc->sc_primed = 0; /* not primed yet */ 369 ppb_init_callout(ppbus, &sc->sc_timer, 0); 370 371 ppb_lock(ppbus); 372 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 373 ppb_unlock(ppbus); 374 device_printf(dev, "cannot alloc ppbus (%d)!\n", error); 375 return (0); 376 } 377 378 ppb_wctr(ppbus, LPC_NINIT); 379 lpt_release_ppbus(dev); 380 ppb_unlock(ppbus); 381 382 /* declare our interrupt handler */ 383 sc->sc_intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 384 RF_SHAREABLE); 385 if (sc->sc_intr_resource) { 386 error = bus_setup_intr(dev, sc->sc_intr_resource, 387 INTR_TYPE_TTY | INTR_MPSAFE, NULL, lptintr, sc, 388 &sc->sc_intr_cookie); 389 if (error) { 390 bus_release_resource(dev, SYS_RES_IRQ, rid, 391 sc->sc_intr_resource); 392 device_printf(dev, 393 "Unable to register interrupt handler\n"); 394 return (error); 395 } 396 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 397 device_printf(dev, "Interrupt-driven port\n"); 398 } else { 399 sc->sc_irq = 0; 400 device_printf(dev, "Polled port\n"); 401 } 402 lprintf(("irq %x\n", sc->sc_irq)); 403 404 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 405 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK); 406 sc->sc_dev = dev; 407 sc->sc_cdev = make_dev(&lpt_cdevsw, unit, 408 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 409 sc->sc_cdev->si_drv1 = sc; 410 sc->sc_cdev->si_drv2 = 0; 411 sc->sc_cdev_bypass = make_dev(&lpt_cdevsw, unit, 412 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 413 sc->sc_cdev_bypass->si_drv1 = sc; 414 sc->sc_cdev_bypass->si_drv2 = (void *)LP_BYPASS; 415 return (0); 416 } 417 418 static int 419 lpt_detach(device_t dev) 420 { 421 struct lpt_data *sc = DEVTOSOFTC(dev); 422 device_t ppbus = device_get_parent(dev); 423 424 destroy_dev(sc->sc_cdev); 425 destroy_dev(sc->sc_cdev_bypass); 426 ppb_lock(ppbus); 427 lpt_release_ppbus(dev); 428 ppb_unlock(ppbus); 429 callout_drain(&sc->sc_timer); 430 if (sc->sc_intr_resource != NULL) { 431 bus_teardown_intr(dev, sc->sc_intr_resource, 432 sc->sc_intr_cookie); 433 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_intr_resource); 434 } 435 free(sc->sc_inbuf, M_DEVBUF); 436 free(sc->sc_statbuf, M_DEVBUF); 437 438 return (0); 439 } 440 441 static void 442 lptout(void *arg) 443 { 444 struct lpt_data *sc = arg; 445 device_t dev = sc->sc_dev; 446 device_t ppbus __unused; 447 448 ppbus = device_get_parent(dev); 449 ppb_assert_locked(ppbus); 450 lprintf(("T %x ", ppb_rstr(ppbus))); 451 if (sc->sc_state & OPEN) { 452 sc->sc_backoff++; 453 if (sc->sc_backoff > hz/LPTOUTMAX) 454 sc->sc_backoff = hz/LPTOUTMAX; 455 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc); 456 } else 457 sc->sc_state &= ~TOUT; 458 459 if (sc->sc_state & EERROR) 460 sc->sc_state &= ~EERROR; 461 462 /* 463 * Avoid possible hangs due to missed interrupts 464 */ 465 if (sc->sc_xfercnt) { 466 lptintr(sc); 467 } else { 468 sc->sc_state &= ~OBUSY; 469 wakeup(dev); 470 } 471 } 472 473 /* 474 * lptopen -- reset the printer, then wait until it's selected and not busy. 475 * If LP_BYPASS flag is selected, then we do not try to select the 476 * printer -- this is just used for passing ioctls. 477 */ 478 479 static int 480 lptopen(struct cdev *dev, int flags, int fmt, struct thread *td) 481 { 482 int trys, err; 483 struct lpt_data *sc = dev->si_drv1; 484 device_t lptdev; 485 device_t ppbus; 486 487 if (!sc) 488 return (ENXIO); 489 490 lptdev = sc->sc_dev; 491 ppbus = device_get_parent(lptdev); 492 493 ppb_lock(ppbus); 494 if (sc->sc_state) { 495 lprintf(("%s: still open %x\n", device_get_nameunit(lptdev), 496 sc->sc_state)); 497 ppb_unlock(ppbus); 498 return(EBUSY); 499 } else 500 sc->sc_state |= LPTINIT; 501 502 sc->sc_flags = (uintptr_t)dev->si_drv2; 503 504 /* Check for open with BYPASS flag set. */ 505 if (sc->sc_flags & LP_BYPASS) { 506 sc->sc_state = OPEN; 507 ppb_unlock(ppbus); 508 return(0); 509 } 510 511 /* request the ppbus only if we don't have it already */ 512 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 513 /* give it a chance to try later */ 514 sc->sc_state = 0; 515 ppb_unlock(ppbus); 516 return (err); 517 } 518 519 lprintf(("%s flags 0x%x\n", device_get_nameunit(lptdev), 520 sc->sc_flags)); 521 522 /* set IRQ status according to ENABLE_IRQ flag 523 */ 524 if (sc->sc_irq & LP_ENABLE_IRQ) 525 sc->sc_irq |= LP_USE_IRQ; 526 else 527 sc->sc_irq &= ~LP_USE_IRQ; 528 529 /* init printer */ 530 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 531 if ((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 532 ppb_wctr(ppbus, 0); 533 sc->sc_primed++; 534 DELAY(500); 535 } 536 } 537 538 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 539 540 /* wait till ready (printer running diagnostics) */ 541 trys = 0; 542 do { 543 /* ran out of waiting for the printer */ 544 if (trys++ >= LPINITRDY*4) { 545 lprintf(("status %x\n", ppb_rstr(ppbus))); 546 547 lpt_release_ppbus(lptdev); 548 sc->sc_state = 0; 549 ppb_unlock(ppbus); 550 return (EBUSY); 551 } 552 553 /* wait 1/4 second, give up if we get a signal */ 554 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lptinit", 555 hz / 4) != EWOULDBLOCK) { 556 lpt_release_ppbus(lptdev); 557 sc->sc_state = 0; 558 ppb_unlock(ppbus); 559 return (EBUSY); 560 } 561 562 /* is printer online and ready for output */ 563 } while ((ppb_rstr(ppbus) & 564 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 565 (LPS_SEL|LPS_NBSY|LPS_NERR)); 566 567 sc->sc_control = LPC_SEL|LPC_NINIT; 568 if (sc->sc_flags & LP_AUTOLF) 569 sc->sc_control |= LPC_AUTOL; 570 571 /* enable interrupt if interrupt-driven */ 572 if (sc->sc_irq & LP_USE_IRQ) 573 sc->sc_control |= LPC_ENA; 574 575 ppb_wctr(ppbus, sc->sc_control); 576 577 sc->sc_state &= ~LPTINIT; 578 sc->sc_state |= OPEN; 579 sc->sc_xfercnt = 0; 580 581 /* only use timeout if using interrupt */ 582 lprintf(("irq %x\n", sc->sc_irq)); 583 if (sc->sc_irq & LP_USE_IRQ) { 584 sc->sc_state |= TOUT; 585 sc->sc_backoff = hz / LPTOUTINITIAL; 586 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc); 587 } 588 589 /* release the ppbus */ 590 lpt_release_ppbus(lptdev); 591 ppb_unlock(ppbus); 592 593 lprintf(("opened.\n")); 594 return(0); 595 } 596 597 /* 598 * lptclose -- close the device, free the local line buffer. 599 * 600 * Check for interrupted write call added. 601 */ 602 603 static int 604 lptclose(struct cdev *dev, int flags, int fmt, struct thread *td) 605 { 606 struct lpt_data *sc = dev->si_drv1; 607 device_t lptdev = sc->sc_dev; 608 device_t ppbus = device_get_parent(lptdev); 609 int err; 610 611 ppb_lock(ppbus); 612 if (sc->sc_flags & LP_BYPASS) 613 goto end_close; 614 615 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 616 ppb_unlock(ppbus); 617 return (err); 618 } 619 620 /* if the last write was interrupted, don't complete it */ 621 if ((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 622 while ((ppb_rstr(ppbus) & 623 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 624 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 625 /* wait 1 second, give up if we get a signal */ 626 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lpclose", 627 hz) != EWOULDBLOCK) 628 break; 629 630 sc->sc_state &= ~OPEN; 631 callout_stop(&sc->sc_timer); 632 ppb_wctr(ppbus, LPC_NINIT); 633 634 /* 635 * unregistration of interrupt forced by release 636 */ 637 lpt_release_ppbus(lptdev); 638 639 end_close: 640 sc->sc_state = 0; 641 sc->sc_xfercnt = 0; 642 ppb_unlock(ppbus); 643 lprintf(("closed.\n")); 644 return(0); 645 } 646 647 /* 648 * lpt_pushbytes() 649 * Workhorse for actually spinning and writing bytes to printer 650 * Derived from lpa.c 651 * Originally by ? 652 * 653 * This code is only used when we are polling the port 654 */ 655 static int 656 lpt_pushbytes(struct lpt_data *sc) 657 { 658 device_t dev = sc->sc_dev; 659 device_t ppbus = device_get_parent(dev); 660 int spin, err, tic; 661 char ch; 662 663 ppb_assert_locked(ppbus); 664 lprintf(("p")); 665 /* loop for every character .. */ 666 while (sc->sc_xfercnt > 0) { 667 /* printer data */ 668 ch = *(sc->sc_cp); 669 sc->sc_cp++; 670 sc->sc_xfercnt--; 671 672 /* 673 * Wait for printer ready. 674 * Loop 20 usecs testing BUSY bit, then sleep 675 * for exponentially increasing timeout. (vak) 676 */ 677 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 678 DELAY(1); /* XXX delay is NOT this accurate! */ 679 if (spin >= MAX_SPIN) { 680 tic = 0; 681 while (NOT_READY(ppbus)) { 682 /* 683 * Now sleep, every cycle a 684 * little longer .. 685 */ 686 tic = tic + tic + 1; 687 /* 688 * But no more than 10 seconds. (vak) 689 */ 690 if (tic > MAX_SLEEP) 691 tic = MAX_SLEEP; 692 err = ppb_sleep(ppbus, dev, LPPRI, 693 LPT_NAME "poll", tic); 694 if (err != EWOULDBLOCK) { 695 return (err); 696 } 697 } 698 } 699 700 /* output data */ 701 ppb_wdtr(ppbus, ch); 702 /* strobe */ 703 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 704 ppb_wctr(ppbus, sc->sc_control); 705 } 706 return(0); 707 } 708 709 /* 710 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 711 */ 712 713 static int 714 lptread(struct cdev *dev, struct uio *uio, int ioflag) 715 { 716 struct lpt_data *sc = dev->si_drv1; 717 device_t lptdev = sc->sc_dev; 718 device_t ppbus = device_get_parent(lptdev); 719 int error = 0, len; 720 721 if (sc->sc_flags & LP_BYPASS) { 722 /* we can't do reads in bypass mode */ 723 return (EPERM); 724 } 725 726 ppb_lock(ppbus); 727 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) { 728 ppb_unlock(ppbus); 729 return (error); 730 } 731 732 /* read data in an other buffer, read/write may be simultaneous */ 733 len = 0; 734 while (uio->uio_resid) { 735 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 736 sc->sc_statbuf, min(BUFSTATSIZE, 737 uio->uio_resid), &len))) { 738 goto error; 739 } 740 741 if (!len) 742 goto error; /* no more data */ 743 744 ppb_unlock(ppbus); 745 error = uiomove(sc->sc_statbuf, len, uio); 746 ppb_lock(ppbus); 747 if (error) 748 goto error; 749 } 750 751 error: 752 ppb_1284_terminate(ppbus); 753 ppb_unlock(ppbus); 754 return (error); 755 } 756 757 /* 758 * lptwrite --copy a line from user space to a local buffer, then call 759 * putc to get the chars moved to the output queue. 760 * 761 * Flagging of interrupted write added. 762 */ 763 764 static int 765 lptwrite(struct cdev *dev, struct uio *uio, int ioflag) 766 { 767 register unsigned n; 768 int err; 769 struct lpt_data *sc = dev->si_drv1; 770 device_t lptdev = sc->sc_dev; 771 device_t ppbus = device_get_parent(lptdev); 772 773 if (sc->sc_flags & LP_BYPASS) { 774 /* we can't do writes in bypass mode */ 775 return (EPERM); 776 } 777 778 /* request the ppbus only if we don't have it already */ 779 ppb_lock(ppbus); 780 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 781 ppb_unlock(ppbus); 782 return (err); 783 } 784 785 sc->sc_state &= ~INTERRUPTED; 786 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 787 sc->sc_cp = sc->sc_inbuf; 788 ppb_unlock(ppbus); 789 err = uiomove(sc->sc_cp, n, uio); 790 ppb_lock(ppbus); 791 if (err) 792 break; 793 sc->sc_xfercnt = n; 794 795 if (sc->sc_irq & LP_ENABLE_EXT) { 796 /* try any extended mode */ 797 err = ppb_write(ppbus, sc->sc_cp, 798 sc->sc_xfercnt, 0); 799 switch (err) { 800 case 0: 801 /* if not all data was sent, we could rely 802 * on polling for the last bytes */ 803 sc->sc_xfercnt = 0; 804 break; 805 case EINTR: 806 sc->sc_state |= INTERRUPTED; 807 ppb_unlock(ppbus); 808 return (err); 809 case EINVAL: 810 /* advanced mode not avail */ 811 log(LOG_NOTICE, 812 "%s: advanced mode not avail, polling\n", 813 device_get_nameunit(sc->sc_dev)); 814 break; 815 default: 816 ppb_unlock(ppbus); 817 return (err); 818 } 819 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 820 lprintf(("i")); 821 /* if the printer is ready for a char, */ 822 /* give it one */ 823 if ((sc->sc_state & OBUSY) == 0){ 824 lprintf(("\nC %d. ", sc->sc_xfercnt)); 825 lptintr(sc); 826 } 827 lprintf(("W ")); 828 if (sc->sc_state & OBUSY) 829 if ((err = ppb_sleep(ppbus, lptdev, 830 LPPRI|PCATCH, LPT_NAME "write", 0))) { 831 sc->sc_state |= INTERRUPTED; 832 ppb_unlock(ppbus); 833 return(err); 834 } 835 } 836 837 /* check to see if we must do a polled write */ 838 if (!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 839 lprintf(("p")); 840 841 err = lpt_pushbytes(sc); 842 843 if (err) { 844 ppb_unlock(ppbus); 845 return (err); 846 } 847 } 848 } 849 850 /* we have not been interrupted, release the ppbus */ 851 lpt_release_ppbus(lptdev); 852 ppb_unlock(ppbus); 853 854 return (err); 855 } 856 857 /* 858 * lptintr -- handle printer interrupts which occur when the printer is 859 * ready to accept another char. 860 * 861 * do checking for interrupted write call. 862 */ 863 static void 864 lptintr(void *arg) 865 { 866 struct lpt_data *sc = arg; 867 device_t lptdev = sc->sc_dev; 868 device_t ppbus = device_get_parent(lptdev); 869 int sts = 0; 870 int i; 871 872 /* 873 * Is printer online and ready for output? 874 * 875 * Avoid falling back to lptout() too quickly. First spin-loop 876 * to see if the printer will become ready ``really soon now''. 877 */ 878 for (i = 0; i < 100 && 879 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 880 881 if ((sts & RDY_MASK) == LP_READY) { 882 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 883 sc->sc_backoff = hz / LPTOUTINITIAL; 884 885 if (sc->sc_xfercnt) { 886 /* send char */ 887 /*lprintf(("%x ", *sc->sc_cp)); */ 888 ppb_wdtr(ppbus, *sc->sc_cp++) ; 889 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 890 /* DELAY(X) */ 891 ppb_wctr(ppbus, sc->sc_control); 892 893 /* any more data for printer */ 894 if (--(sc->sc_xfercnt) > 0) 895 return; 896 } 897 898 /* 899 * No more data waiting for printer. 900 * Wakeup is not done if write call was not interrupted. 901 */ 902 sc->sc_state &= ~OBUSY; 903 904 if (!(sc->sc_state & INTERRUPTED)) 905 wakeup(lptdev); 906 lprintf(("w ")); 907 return; 908 } else { /* check for error */ 909 if (((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 910 (sc->sc_state & OPEN)) 911 sc->sc_state |= EERROR; 912 /* lptout() will jump in and try to restart. */ 913 } 914 lprintf(("sts %x ", sts)); 915 } 916 917 static int 918 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 919 { 920 int error = 0; 921 struct lpt_data *sc = dev->si_drv1; 922 device_t ppbus; 923 u_char old_sc_irq; /* old printer IRQ status */ 924 925 switch (cmd) { 926 case LPT_IRQ : 927 ppbus = device_get_parent(sc->sc_dev); 928 ppb_lock(ppbus); 929 if (sc->sc_irq & LP_HAS_IRQ) { 930 /* 931 * NOTE: 932 * If the IRQ status is changed, 933 * this will only be visible on the 934 * next open. 935 * 936 * If interrupt status changes, 937 * this gets syslog'd. 938 */ 939 old_sc_irq = sc->sc_irq; 940 switch (*(int*)data) { 941 case 0: 942 sc->sc_irq &= (~LP_ENABLE_IRQ); 943 break; 944 case 1: 945 sc->sc_irq &= (~LP_ENABLE_EXT); 946 sc->sc_irq |= LP_ENABLE_IRQ; 947 break; 948 case 2: 949 /* classic irq based transfer and advanced 950 * modes are in conflict 951 */ 952 sc->sc_irq &= (~LP_ENABLE_IRQ); 953 sc->sc_irq |= LP_ENABLE_EXT; 954 break; 955 case 3: 956 sc->sc_irq &= (~LP_ENABLE_EXT); 957 break; 958 default: 959 break; 960 } 961 962 if (old_sc_irq != sc->sc_irq ) 963 log(LOG_NOTICE, "%s: switched to %s %s mode\n", 964 device_get_nameunit(sc->sc_dev), 965 (sc->sc_irq & LP_ENABLE_IRQ)? 966 "interrupt-driven":"polled", 967 (sc->sc_irq & LP_ENABLE_EXT)? 968 "extended":"standard"); 969 } else /* polled port */ 970 error = EOPNOTSUPP; 971 ppb_unlock(ppbus); 972 break; 973 default: 974 error = ENODEV; 975 } 976 977 return(error); 978 } 979 980 static device_method_t lpt_methods[] = { 981 /* device interface */ 982 DEVMETHOD(device_identify, lpt_identify), 983 DEVMETHOD(device_probe, lpt_probe), 984 DEVMETHOD(device_attach, lpt_attach), 985 DEVMETHOD(device_detach, lpt_detach), 986 { 0, 0 } 987 }; 988 989 static driver_t lpt_driver = { 990 LPT_NAME, 991 lpt_methods, 992 sizeof(struct lpt_data), 993 }; 994 995 DRIVER_MODULE(lpt, ppbus, lpt_driver, 0, 0); 996 MODULE_DEPEND(lpt, ppbus, 1, 1, 1); 997