Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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sys/dev/ppbus/lpt.c
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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 callout_func_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 /* bits for state */ 153 #define OPEN (1<<0) /* device is open */ 154 #define ASLP (1<<1) /* awaiting draining of printer */ 155 #define EERROR (1<<2) /* error was received from printer */ 156 #define OBUSY (1<<3) /* printer is busy doing output */ 157 #define LPTOUT (1<<4) /* timeout while not selected */ 158 #define TOUT (1<<5) /* timeout while not selected */ 159 #define LPTINIT (1<<6) /* waiting to initialize for open */ 160 #define INTERRUPTED (1<<7) /* write call was interrupted */ 161 #define HAVEBUS (1<<8) /* the driver owns the bus */ 162 163 /* status masks to interrogate printer status */ 164 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 165 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 166 167 /* Printer Ready condition - from lpa.c */ 168 /* Only used in polling code */ 169 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 170 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 171 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 172 173 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 174 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 175 176 static d_open_t lptopen; 177 static d_close_t lptclose; 178 static d_write_t lptwrite; 179 static d_read_t lptread; 180 static d_ioctl_t lptioctl; 181 182 static struct cdevsw lpt_cdevsw = { 183 .d_version = D_VERSION, 184 .d_open = lptopen, 185 .d_close = lptclose, 186 .d_read = lptread, 187 .d_write = lptwrite, 188 .d_ioctl = lptioctl, 189 .d_name = LPT_NAME, 190 }; 191 192 static int 193 lpt_request_ppbus(device_t dev, int how) 194 { 195 device_t ppbus = device_get_parent(dev); 196 struct lpt_data *sc = DEVTOSOFTC(dev); 197 int error; 198 199 /* 200 * We might already have the bus for a write(2) after an interrupted 201 * write(2) call. 202 */ 203 ppb_assert_locked(ppbus); 204 if (sc->sc_state & HAVEBUS) 205 return (0); 206 207 error = ppb_request_bus(ppbus, dev, how); 208 if (error == 0) 209 sc->sc_state |= HAVEBUS; 210 return (error); 211 } 212 213 static int 214 lpt_release_ppbus(device_t dev) 215 { 216 device_t ppbus = device_get_parent(dev); 217 struct lpt_data *sc = DEVTOSOFTC(dev); 218 int error = 0; 219 220 ppb_assert_locked(ppbus); 221 if (sc->sc_state & HAVEBUS) { 222 error = ppb_release_bus(ppbus, dev); 223 if (error == 0) 224 sc->sc_state &= ~HAVEBUS; 225 } 226 return (error); 227 } 228 229 /* 230 * Internal routine to lptprobe to do port tests of one byte value 231 */ 232 static int 233 lpt_port_test(device_t ppbus, u_char data, u_char mask) 234 { 235 int temp, timeout; 236 237 data = data & mask; 238 ppb_wdtr(ppbus, data); 239 timeout = 10000; 240 do { 241 DELAY(10); 242 temp = ppb_rdtr(ppbus) & mask; 243 } 244 while (temp != data && --timeout); 245 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 246 return (temp == data); 247 } 248 249 /* 250 * Probe simplified by replacing multiple loops with a hardcoded 251 * test pattern - 1999/02/08 des@freebsd.org 252 * 253 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 254 * Based partially on Rod Grimes' printer probe 255 * 256 * Logic: 257 * 1) If no port address was given, use the bios detected ports 258 * and autodetect what ports the printers are on. 259 * 2) Otherwise, probe the data port at the address given, 260 * using the method in Rod Grimes' port probe. 261 * (Much code ripped off directly from Rod's probe.) 262 * 263 * Comments from Rod's probe: 264 * Logic: 265 * 1) You should be able to write to and read back the same value 266 * to the data port. Do an alternating zeros, alternating ones, 267 * walking zero, and walking one test to check for stuck bits. 268 * 269 * 2) You should be able to write to and read back the same value 270 * to the control port lower 5 bits, the upper 3 bits are reserved 271 * per the IBM PC technical reference manuals and different boards 272 * do different things with them. Do an alternating zeros, alternating 273 * ones, walking zero, and walking one test to check for stuck bits. 274 * 275 * Some printers drag the strobe line down when the are powered off 276 * so this bit has been masked out of the control port test. 277 * 278 * XXX Some printers may not like a fast pulse on init or strobe, I 279 * don't know at this point, if that becomes a problem these bits 280 * should be turned off in the mask byte for the control port test. 281 * 282 * We are finally left with a mask of 0x14, due to some printers 283 * being adamant about holding other bits high ........ 284 * 285 * Before probing the control port, we write a 0 to the data port - 286 * If not, some printers chuck out garbage when the strobe line 287 * gets toggled. 288 * 289 * 3) Set the data and control ports to a value of 0 290 * 291 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 292 * Epson FX-1170 and C.Itoh 8510RM 293 * printers. 294 * Quick exit on fail added. 295 */ 296 static int 297 lpt_detect(device_t dev) 298 { 299 device_t ppbus = device_get_parent(dev); 300 301 static u_char testbyte[18] = { 302 0x55, /* alternating zeros */ 303 0xaa, /* alternating ones */ 304 0xfe, 0xfd, 0xfb, 0xf7, 305 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 306 0x01, 0x02, 0x04, 0x08, 307 0x10, 0x20, 0x40, 0x80 /* walking one */ 308 }; 309 int i, error, status; 310 311 status = 1; /* assume success */ 312 313 ppb_lock(ppbus); 314 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 315 ppb_unlock(ppbus); 316 device_printf(dev, "cannot alloc ppbus (%d)!\n", error); 317 return (0); 318 } 319 320 for (i = 0; i < 18 && status; i++) 321 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 322 status = 0; 323 break; 324 } 325 326 /* write 0's to control and data ports */ 327 ppb_wdtr(ppbus, 0); 328 ppb_wctr(ppbus, 0); 329 330 lpt_release_ppbus(dev); 331 ppb_unlock(ppbus); 332 333 return (status); 334 } 335 336 static void 337 lpt_identify(driver_t *driver, device_t parent) 338 { 339 340 device_t dev; 341 342 dev = device_find_child(parent, LPT_NAME, -1); 343 if (!dev) 344 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1); 345 } 346 347 /* 348 * lpt_probe() 349 */ 350 static int 351 lpt_probe(device_t dev) 352 { 353 354 if (!lpt_detect(dev)) 355 return (ENXIO); 356 357 device_set_desc(dev, "Printer"); 358 359 return (0); 360 } 361 362 static int 363 lpt_attach(device_t dev) 364 { 365 device_t ppbus = device_get_parent(dev); 366 struct lpt_data *sc = DEVTOSOFTC(dev); 367 int rid = 0, unit = device_get_unit(dev); 368 int error; 369 370 sc->sc_primed = 0; /* not primed yet */ 371 ppb_init_callout(ppbus, &sc->sc_timer, 0); 372 373 ppb_lock(ppbus); 374 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 375 ppb_unlock(ppbus); 376 device_printf(dev, "cannot alloc ppbus (%d)!\n", error); 377 return (0); 378 } 379 380 ppb_wctr(ppbus, LPC_NINIT); 381 lpt_release_ppbus(dev); 382 ppb_unlock(ppbus); 383 384 /* declare our interrupt handler */ 385 sc->sc_intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 386 RF_SHAREABLE); 387 if (sc->sc_intr_resource) { 388 error = bus_setup_intr(dev, sc->sc_intr_resource, 389 INTR_TYPE_TTY | INTR_MPSAFE, NULL, lptintr, sc, 390 &sc->sc_intr_cookie); 391 if (error) { 392 bus_release_resource(dev, SYS_RES_IRQ, rid, 393 sc->sc_intr_resource); 394 device_printf(dev, 395 "Unable to register interrupt handler\n"); 396 return (error); 397 } 398 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 399 device_printf(dev, "Interrupt-driven port\n"); 400 } else { 401 sc->sc_irq = 0; 402 device_printf(dev, "Polled port\n"); 403 } 404 lprintf(("irq %x\n", sc->sc_irq)); 405 406 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 407 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK); 408 sc->sc_dev = dev; 409 sc->sc_cdev = make_dev(&lpt_cdevsw, unit, 410 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 411 sc->sc_cdev->si_drv1 = sc; 412 sc->sc_cdev->si_drv2 = 0; 413 sc->sc_cdev_bypass = make_dev(&lpt_cdevsw, unit, 414 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 415 sc->sc_cdev_bypass->si_drv1 = sc; 416 sc->sc_cdev_bypass->si_drv2 = (void *)LP_BYPASS; 417 return (0); 418 } 419 420 static int 421 lpt_detach(device_t dev) 422 { 423 struct lpt_data *sc = DEVTOSOFTC(dev); 424 device_t ppbus = device_get_parent(dev); 425 426 destroy_dev(sc->sc_cdev); 427 destroy_dev(sc->sc_cdev_bypass); 428 ppb_lock(ppbus); 429 lpt_release_ppbus(dev); 430 ppb_unlock(ppbus); 431 callout_drain(&sc->sc_timer); 432 if (sc->sc_intr_resource != NULL) { 433 bus_teardown_intr(dev, sc->sc_intr_resource, 434 sc->sc_intr_cookie); 435 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_intr_resource); 436 } 437 free(sc->sc_inbuf, M_DEVBUF); 438 free(sc->sc_statbuf, M_DEVBUF); 439 440 return (0); 441 } 442 443 static void 444 lptout(void *arg) 445 { 446 struct lpt_data *sc = arg; 447 device_t dev = sc->sc_dev; 448 device_t ppbus __unused; 449 450 ppbus = device_get_parent(dev); 451 ppb_assert_locked(ppbus); 452 lprintf(("T %x ", ppb_rstr(ppbus))); 453 if (sc->sc_state & OPEN) { 454 sc->sc_backoff++; 455 if (sc->sc_backoff > hz/LPTOUTMAX) 456 sc->sc_backoff = hz/LPTOUTMAX; 457 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc); 458 } else 459 sc->sc_state &= ~TOUT; 460 461 if (sc->sc_state & EERROR) 462 sc->sc_state &= ~EERROR; 463 464 /* 465 * Avoid possible hangs due to missed interrupts 466 */ 467 if (sc->sc_xfercnt) { 468 lptintr(sc); 469 } else { 470 sc->sc_state &= ~OBUSY; 471 wakeup(dev); 472 } 473 } 474 475 /* 476 * lptopen -- reset the printer, then wait until it's selected and not busy. 477 * If LP_BYPASS flag is selected, then we do not try to select the 478 * printer -- this is just used for passing ioctls. 479 */ 480 481 static int 482 lptopen(struct cdev *dev, int flags, int fmt, struct thread *td) 483 { 484 int trys, err; 485 struct lpt_data *sc = dev->si_drv1; 486 device_t lptdev; 487 device_t ppbus; 488 489 if (!sc) 490 return (ENXIO); 491 492 lptdev = sc->sc_dev; 493 ppbus = device_get_parent(lptdev); 494 495 ppb_lock(ppbus); 496 if (sc->sc_state) { 497 lprintf(("%s: still open %x\n", device_get_nameunit(lptdev), 498 sc->sc_state)); 499 ppb_unlock(ppbus); 500 return(EBUSY); 501 } else 502 sc->sc_state |= LPTINIT; 503 504 sc->sc_flags = (uintptr_t)dev->si_drv2; 505 506 /* Check for open with BYPASS flag set. */ 507 if (sc->sc_flags & LP_BYPASS) { 508 sc->sc_state = OPEN; 509 ppb_unlock(ppbus); 510 return(0); 511 } 512 513 /* request the ppbus only if we don't have it already */ 514 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 515 /* give it a chance to try later */ 516 sc->sc_state = 0; 517 ppb_unlock(ppbus); 518 return (err); 519 } 520 521 lprintf(("%s flags 0x%x\n", device_get_nameunit(lptdev), 522 sc->sc_flags)); 523 524 /* set IRQ status according to ENABLE_IRQ flag 525 */ 526 if (sc->sc_irq & LP_ENABLE_IRQ) 527 sc->sc_irq |= LP_USE_IRQ; 528 else 529 sc->sc_irq &= ~LP_USE_IRQ; 530 531 /* init printer */ 532 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 533 if ((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 534 ppb_wctr(ppbus, 0); 535 sc->sc_primed++; 536 DELAY(500); 537 } 538 } 539 540 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 541 542 /* wait till ready (printer running diagnostics) */ 543 trys = 0; 544 do { 545 /* ran out of waiting for the printer */ 546 if (trys++ >= LPINITRDY*4) { 547 lprintf(("status %x\n", ppb_rstr(ppbus))); 548 549 lpt_release_ppbus(lptdev); 550 sc->sc_state = 0; 551 ppb_unlock(ppbus); 552 return (EBUSY); 553 } 554 555 /* wait 1/4 second, give up if we get a signal */ 556 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lptinit", 557 hz / 4) != EWOULDBLOCK) { 558 lpt_release_ppbus(lptdev); 559 sc->sc_state = 0; 560 ppb_unlock(ppbus); 561 return (EBUSY); 562 } 563 564 /* is printer online and ready for output */ 565 } while ((ppb_rstr(ppbus) & 566 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 567 (LPS_SEL|LPS_NBSY|LPS_NERR)); 568 569 sc->sc_control = LPC_SEL|LPC_NINIT; 570 if (sc->sc_flags & LP_AUTOLF) 571 sc->sc_control |= LPC_AUTOL; 572 573 /* enable interrupt if interrupt-driven */ 574 if (sc->sc_irq & LP_USE_IRQ) 575 sc->sc_control |= LPC_ENA; 576 577 ppb_wctr(ppbus, sc->sc_control); 578 579 sc->sc_state &= ~LPTINIT; 580 sc->sc_state |= OPEN; 581 sc->sc_xfercnt = 0; 582 583 /* only use timeout if using interrupt */ 584 lprintf(("irq %x\n", sc->sc_irq)); 585 if (sc->sc_irq & LP_USE_IRQ) { 586 sc->sc_state |= TOUT; 587 sc->sc_backoff = hz / LPTOUTINITIAL; 588 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc); 589 } 590 591 /* release the ppbus */ 592 lpt_release_ppbus(lptdev); 593 ppb_unlock(ppbus); 594 595 lprintf(("opened.\n")); 596 return(0); 597 } 598 599 /* 600 * lptclose -- close the device, free the local line buffer. 601 * 602 * Check for interrupted write call added. 603 */ 604 605 static int 606 lptclose(struct cdev *dev, int flags, int fmt, struct thread *td) 607 { 608 struct lpt_data *sc = dev->si_drv1; 609 device_t lptdev = sc->sc_dev; 610 device_t ppbus = device_get_parent(lptdev); 611 int err; 612 613 ppb_lock(ppbus); 614 if (sc->sc_flags & LP_BYPASS) 615 goto end_close; 616 617 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 618 ppb_unlock(ppbus); 619 return (err); 620 } 621 622 /* if the last write was interrupted, don't complete it */ 623 if ((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 624 while ((ppb_rstr(ppbus) & 625 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 626 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 627 /* wait 1 second, give up if we get a signal */ 628 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lpclose", 629 hz) != EWOULDBLOCK) 630 break; 631 632 sc->sc_state &= ~OPEN; 633 callout_stop(&sc->sc_timer); 634 ppb_wctr(ppbus, LPC_NINIT); 635 636 /* 637 * unregistration of interrupt forced by release 638 */ 639 lpt_release_ppbus(lptdev); 640 641 end_close: 642 sc->sc_state = 0; 643 sc->sc_xfercnt = 0; 644 ppb_unlock(ppbus); 645 lprintf(("closed.\n")); 646 return(0); 647 } 648 649 /* 650 * lpt_pushbytes() 651 * Workhorse for actually spinning and writing bytes to printer 652 * Derived from lpa.c 653 * Originally by ? 654 * 655 * This code is only used when we are polling the port 656 */ 657 static int 658 lpt_pushbytes(struct lpt_data *sc) 659 { 660 device_t dev = sc->sc_dev; 661 device_t ppbus = device_get_parent(dev); 662 int spin, err, tic; 663 char ch; 664 665 ppb_assert_locked(ppbus); 666 lprintf(("p")); 667 /* loop for every character .. */ 668 while (sc->sc_xfercnt > 0) { 669 /* printer data */ 670 ch = *(sc->sc_cp); 671 sc->sc_cp++; 672 sc->sc_xfercnt--; 673 674 /* 675 * Wait for printer ready. 676 * Loop 20 usecs testing BUSY bit, then sleep 677 * for exponentially increasing timeout. (vak) 678 */ 679 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 680 DELAY(1); /* XXX delay is NOT this accurate! */ 681 if (spin >= MAX_SPIN) { 682 tic = 0; 683 while (NOT_READY(ppbus)) { 684 /* 685 * Now sleep, every cycle a 686 * little longer .. 687 */ 688 tic = tic + tic + 1; 689 /* 690 * But no more than 10 seconds. (vak) 691 */ 692 if (tic > MAX_SLEEP) 693 tic = MAX_SLEEP; 694 err = ppb_sleep(ppbus, dev, LPPRI, 695 LPT_NAME "poll", tic); 696 if (err != EWOULDBLOCK) { 697 return (err); 698 } 699 } 700 } 701 702 /* output data */ 703 ppb_wdtr(ppbus, ch); 704 /* strobe */ 705 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 706 ppb_wctr(ppbus, sc->sc_control); 707 } 708 return(0); 709 } 710 711 /* 712 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 713 */ 714 715 static int 716 lptread(struct cdev *dev, struct uio *uio, int ioflag) 717 { 718 struct lpt_data *sc = dev->si_drv1; 719 device_t lptdev = sc->sc_dev; 720 device_t ppbus = device_get_parent(lptdev); 721 int error = 0, len; 722 723 if (sc->sc_flags & LP_BYPASS) { 724 /* we can't do reads in bypass mode */ 725 return (EPERM); 726 } 727 728 ppb_lock(ppbus); 729 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) { 730 ppb_unlock(ppbus); 731 return (error); 732 } 733 734 /* read data in an other buffer, read/write may be simultaneous */ 735 len = 0; 736 while (uio->uio_resid) { 737 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 738 sc->sc_statbuf, min(BUFSTATSIZE, 739 uio->uio_resid), &len))) { 740 goto error; 741 } 742 743 if (!len) 744 goto error; /* no more data */ 745 746 ppb_unlock(ppbus); 747 error = uiomove(sc->sc_statbuf, len, uio); 748 ppb_lock(ppbus); 749 if (error) 750 goto error; 751 } 752 753 error: 754 ppb_1284_terminate(ppbus); 755 ppb_unlock(ppbus); 756 return (error); 757 } 758 759 /* 760 * lptwrite --copy a line from user space to a local buffer, then call 761 * putc to get the chars moved to the output queue. 762 * 763 * Flagging of interrupted write added. 764 */ 765 766 static int 767 lptwrite(struct cdev *dev, struct uio *uio, int ioflag) 768 { 769 register unsigned n; 770 int err; 771 struct lpt_data *sc = dev->si_drv1; 772 device_t lptdev = sc->sc_dev; 773 device_t ppbus = device_get_parent(lptdev); 774 775 if (sc->sc_flags & LP_BYPASS) { 776 /* we can't do writes in bypass mode */ 777 return (EPERM); 778 } 779 780 /* request the ppbus only if we don't have it already */ 781 ppb_lock(ppbus); 782 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 783 ppb_unlock(ppbus); 784 return (err); 785 } 786 787 sc->sc_state &= ~INTERRUPTED; 788 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 789 sc->sc_cp = sc->sc_inbuf; 790 ppb_unlock(ppbus); 791 err = uiomove(sc->sc_cp, n, uio); 792 ppb_lock(ppbus); 793 if (err) 794 break; 795 sc->sc_xfercnt = n; 796 797 if (sc->sc_irq & LP_ENABLE_EXT) { 798 /* try any extended mode */ 799 err = ppb_write(ppbus, sc->sc_cp, 800 sc->sc_xfercnt, 0); 801 switch (err) { 802 case 0: 803 /* if not all data was sent, we could rely 804 * on polling for the last bytes */ 805 sc->sc_xfercnt = 0; 806 break; 807 case EINTR: 808 sc->sc_state |= INTERRUPTED; 809 ppb_unlock(ppbus); 810 return (err); 811 case EINVAL: 812 /* advanced mode not avail */ 813 log(LOG_NOTICE, 814 "%s: advanced mode not avail, polling\n", 815 device_get_nameunit(sc->sc_dev)); 816 break; 817 default: 818 ppb_unlock(ppbus); 819 return (err); 820 } 821 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 822 lprintf(("i")); 823 /* if the printer is ready for a char, */ 824 /* give it one */ 825 if ((sc->sc_state & OBUSY) == 0){ 826 lprintf(("\nC %d. ", sc->sc_xfercnt)); 827 lptintr(sc); 828 } 829 lprintf(("W ")); 830 if (sc->sc_state & OBUSY) 831 if ((err = ppb_sleep(ppbus, lptdev, 832 LPPRI|PCATCH, LPT_NAME "write", 0))) { 833 sc->sc_state |= INTERRUPTED; 834 ppb_unlock(ppbus); 835 return(err); 836 } 837 } 838 839 /* check to see if we must do a polled write */ 840 if (!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 841 lprintf(("p")); 842 843 err = lpt_pushbytes(sc); 844 845 if (err) { 846 ppb_unlock(ppbus); 847 return (err); 848 } 849 } 850 } 851 852 /* we have not been interrupted, release the ppbus */ 853 lpt_release_ppbus(lptdev); 854 ppb_unlock(ppbus); 855 856 return (err); 857 } 858 859 /* 860 * lptintr -- handle printer interrupts which occur when the printer is 861 * ready to accept another char. 862 * 863 * do checking for interrupted write call. 864 */ 865 static void 866 lptintr(void *arg) 867 { 868 struct lpt_data *sc = arg; 869 device_t lptdev = sc->sc_dev; 870 device_t ppbus = device_get_parent(lptdev); 871 int sts = 0; 872 int i; 873 874 /* 875 * Is printer online and ready for output? 876 * 877 * Avoid falling back to lptout() too quickly. First spin-loop 878 * to see if the printer will become ready ``really soon now''. 879 */ 880 for (i = 0; i < 100 && 881 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 882 883 if ((sts & RDY_MASK) == LP_READY) { 884 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 885 sc->sc_backoff = hz / LPTOUTINITIAL; 886 887 if (sc->sc_xfercnt) { 888 /* send char */ 889 /*lprintf(("%x ", *sc->sc_cp)); */ 890 ppb_wdtr(ppbus, *sc->sc_cp++) ; 891 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 892 /* DELAY(X) */ 893 ppb_wctr(ppbus, sc->sc_control); 894 895 /* any more data for printer */ 896 if (--(sc->sc_xfercnt) > 0) 897 return; 898 } 899 900 /* 901 * No more data waiting for printer. 902 * Wakeup is not done if write call was not interrupted. 903 */ 904 sc->sc_state &= ~OBUSY; 905 906 if (!(sc->sc_state & INTERRUPTED)) 907 wakeup(lptdev); 908 lprintf(("w ")); 909 return; 910 } else { /* check for error */ 911 if (((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 912 (sc->sc_state & OPEN)) 913 sc->sc_state |= EERROR; 914 /* lptout() will jump in and try to restart. */ 915 } 916 lprintf(("sts %x ", sts)); 917 } 918 919 static int 920 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 921 { 922 int error = 0; 923 struct lpt_data *sc = dev->si_drv1; 924 device_t ppbus; 925 u_char old_sc_irq; /* old printer IRQ status */ 926 927 switch (cmd) { 928 case LPT_IRQ : 929 ppbus = device_get_parent(sc->sc_dev); 930 ppb_lock(ppbus); 931 if (sc->sc_irq & LP_HAS_IRQ) { 932 /* 933 * NOTE: 934 * If the IRQ status is changed, 935 * this will only be visible on the 936 * next open. 937 * 938 * If interrupt status changes, 939 * this gets syslog'd. 940 */ 941 old_sc_irq = sc->sc_irq; 942 switch (*(int*)data) { 943 case 0: 944 sc->sc_irq &= (~LP_ENABLE_IRQ); 945 break; 946 case 1: 947 sc->sc_irq &= (~LP_ENABLE_EXT); 948 sc->sc_irq |= LP_ENABLE_IRQ; 949 break; 950 case 2: 951 /* classic irq based transfer and advanced 952 * modes are in conflict 953 */ 954 sc->sc_irq &= (~LP_ENABLE_IRQ); 955 sc->sc_irq |= LP_ENABLE_EXT; 956 break; 957 case 3: 958 sc->sc_irq &= (~LP_ENABLE_EXT); 959 break; 960 default: 961 break; 962 } 963 964 if (old_sc_irq != sc->sc_irq ) 965 log(LOG_NOTICE, "%s: switched to %s %s mode\n", 966 device_get_nameunit(sc->sc_dev), 967 (sc->sc_irq & LP_ENABLE_IRQ)? 968 "interrupt-driven":"polled", 969 (sc->sc_irq & LP_ENABLE_EXT)? 970 "extended":"standard"); 971 } else /* polled port */ 972 error = EOPNOTSUPP; 973 ppb_unlock(ppbus); 974 break; 975 default: 976 error = ENODEV; 977 } 978 979 return(error); 980 } 981 982 static device_method_t lpt_methods[] = { 983 /* device interface */ 984 DEVMETHOD(device_identify, lpt_identify), 985 DEVMETHOD(device_probe, lpt_probe), 986 DEVMETHOD(device_attach, lpt_attach), 987 DEVMETHOD(device_detach, lpt_detach), 988 { 0, 0 } 989 }; 990 991 static driver_t lpt_driver = { 992 LPT_NAME, 993 lpt_methods, 994 sizeof(struct lpt_data), 995 }; 996 997 DRIVER_MODULE(lpt, ppbus, lpt_driver, 0, 0); 998 MODULE_DEPEND(lpt, ppbus, 1, 1, 1);
Cache object: dbd9ece0ea48e63844604b6f6e39b7b0
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