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 * Copyright (c) 1990 William F. Jolitz, TeleMuse 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This software is a component of "386BSD" developed by 16 * William F. Jolitz, TeleMuse. 17 * 4. Neither the name of the developer nor the name "386BSD" 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 22 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 23 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 24 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 25 * NOT MAKE USE OF THIS WORK. 26 * 27 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 28 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 29 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 30 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 31 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 32 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 33 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 34 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 35 * 36 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 39 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 46 * SUCH DAMAGE. 47 * 48 * from: unknown origin, 386BSD 0.1 49 * From Id: lpt.c,v 1.55.2.1 1996/11/12 09:08:38 phk Exp 50 * From Id: nlpt.c,v 1.14 1999/02/08 13:55:43 des Exp 51 */ 52 53 #include <sys/cdefs.h> 54 __FBSDID("$FreeBSD: releng/10.3/sys/dev/ppbus/lpt.c 227814 2011-11-22 11:35:24Z attilio $"); 55 56 /* 57 * Device Driver for AT parallel printer port 58 * Written by William Jolitz 12/18/90 59 */ 60 61 /* 62 * Updated for ppbus by Nicolas Souchu 63 * [Mon Jul 28 1997] 64 */ 65 66 #include "opt_lpt.h" 67 68 #include <sys/param.h> 69 #include <sys/systm.h> 70 #include <sys/module.h> 71 #include <sys/bus.h> 72 #include <sys/conf.h> 73 #include <sys/kernel.h> 74 #include <sys/uio.h> 75 #include <sys/syslog.h> 76 #include <sys/malloc.h> 77 78 #include <machine/bus.h> 79 #include <machine/resource.h> 80 #include <sys/rman.h> 81 82 #include <dev/ppbus/lptio.h> 83 #include <dev/ppbus/ppbconf.h> 84 #include <dev/ppbus/ppb_1284.h> 85 #include <dev/ppbus/lpt.h> 86 #include "ppbus_if.h" 87 #include <dev/ppbus/ppbio.h> 88 89 #ifndef LPT_DEBUG 90 #define lprintf(args) 91 #else 92 #define lprintf(args) \ 93 do { \ 94 if (lptflag) \ 95 printf args; \ 96 } while (0) 97 static int volatile lptflag = 1; 98 #endif 99 100 #define LPINITRDY 4 /* wait up to 4 seconds for a ready */ 101 #define LPTOUTINITIAL 10 /* initial timeout to wait for ready 1/10 s */ 102 #define LPTOUTMAX 1 /* maximal timeout 1 s */ 103 #define LPPRI (PZERO+8) 104 #define BUFSIZE 1024 105 #define BUFSTATSIZE 32 106 107 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 postive 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 timeout_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 static devclass_t lpt_devclass; 151 152 153 /* bits for state */ 154 #define OPEN (1<<0) /* device is open */ 155 #define ASLP (1<<1) /* awaiting draining of printer */ 156 #define EERROR (1<<2) /* error was received from printer */ 157 #define OBUSY (1<<3) /* printer is busy doing output */ 158 #define LPTOUT (1<<4) /* timeout while not selected */ 159 #define TOUT (1<<5) /* timeout while not selected */ 160 #define LPTINIT (1<<6) /* waiting to initialize for open */ 161 #define INTERRUPTED (1<<7) /* write call was interrupted */ 162 #define HAVEBUS (1<<8) /* the driver owns the bus */ 163 164 /* status masks to interrogate printer status */ 165 #define RDY_MASK (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR) /* ready ? */ 166 #define LP_READY (LPS_SEL|LPS_NBSY|LPS_NERR) 167 168 /* Printer Ready condition - from lpa.c */ 169 /* Only used in polling code */ 170 #define LPS_INVERT (LPS_NBSY | LPS_NACK | LPS_SEL | LPS_NERR) 171 #define LPS_MASK (LPS_NBSY | LPS_NACK | LPS_OUT | LPS_SEL | LPS_NERR) 172 #define NOT_READY(ppbus) ((ppb_rstr(ppbus)^LPS_INVERT)&LPS_MASK) 173 174 #define MAX_SLEEP (hz*5) /* Timeout while waiting for device ready */ 175 #define MAX_SPIN 20 /* Max delay for device ready in usecs */ 176 177 178 static d_open_t lptopen; 179 static d_close_t lptclose; 180 static d_write_t lptwrite; 181 static d_read_t lptread; 182 static d_ioctl_t lptioctl; 183 184 static struct cdevsw lpt_cdevsw = { 185 .d_version = D_VERSION, 186 .d_open = lptopen, 187 .d_close = lptclose, 188 .d_read = lptread, 189 .d_write = lptwrite, 190 .d_ioctl = lptioctl, 191 .d_name = LPT_NAME, 192 }; 193 194 static int 195 lpt_request_ppbus(device_t dev, int how) 196 { 197 device_t ppbus = device_get_parent(dev); 198 struct lpt_data *sc = DEVTOSOFTC(dev); 199 int error; 200 201 /* 202 * We might already have the bus for a write(2) after an interrupted 203 * write(2) call. 204 */ 205 ppb_assert_locked(ppbus); 206 if (sc->sc_state & HAVEBUS) 207 return (0); 208 209 error = ppb_request_bus(ppbus, dev, how); 210 if (error == 0) 211 sc->sc_state |= HAVEBUS; 212 return (error); 213 } 214 215 static int 216 lpt_release_ppbus(device_t dev) 217 { 218 device_t ppbus = device_get_parent(dev); 219 struct lpt_data *sc = DEVTOSOFTC(dev); 220 int error = 0; 221 222 ppb_assert_locked(ppbus); 223 if (sc->sc_state & HAVEBUS) { 224 error = ppb_release_bus(ppbus, dev); 225 if (error == 0) 226 sc->sc_state &= ~HAVEBUS; 227 } 228 return (error); 229 } 230 231 /* 232 * Internal routine to lptprobe to do port tests of one byte value 233 */ 234 static int 235 lpt_port_test(device_t ppbus, u_char data, u_char mask) 236 { 237 int temp, timeout; 238 239 data = data & mask; 240 ppb_wdtr(ppbus, data); 241 timeout = 10000; 242 do { 243 DELAY(10); 244 temp = ppb_rdtr(ppbus) & mask; 245 } 246 while (temp != data && --timeout); 247 lprintf(("out=%x\tin=%x\ttout=%d\n", data, temp, timeout)); 248 return (temp == data); 249 } 250 251 /* 252 * Probe simplified by replacing multiple loops with a hardcoded 253 * test pattern - 1999/02/08 des@freebsd.org 254 * 255 * New lpt port probe Geoff Rehmet - Rhodes University - 14/2/94 256 * Based partially on Rod Grimes' printer probe 257 * 258 * Logic: 259 * 1) If no port address was given, use the bios detected ports 260 * and autodetect what ports the printers are on. 261 * 2) Otherwise, probe the data port at the address given, 262 * using the method in Rod Grimes' port probe. 263 * (Much code ripped off directly from Rod's probe.) 264 * 265 * Comments from Rod's probe: 266 * Logic: 267 * 1) You should be able to write to and read back the same value 268 * to the data port. Do an alternating zeros, alternating ones, 269 * walking zero, and walking one test to check for stuck bits. 270 * 271 * 2) You should be able to write to and read back the same value 272 * to the control port lower 5 bits, the upper 3 bits are reserved 273 * per the IBM PC technical reference manauls and different boards 274 * do different things with them. Do an alternating zeros, alternating 275 * ones, walking zero, and walking one test to check for stuck bits. 276 * 277 * Some printers drag the strobe line down when the are powered off 278 * so this bit has been masked out of the control port test. 279 * 280 * XXX Some printers may not like a fast pulse on init or strobe, I 281 * don't know at this point, if that becomes a problem these bits 282 * should be turned off in the mask byte for the control port test. 283 * 284 * We are finally left with a mask of 0x14, due to some printers 285 * being adamant about holding other bits high ........ 286 * 287 * Before probing the control port, we write a 0 to the data port - 288 * If not, some printers chuck out garbage when the strobe line 289 * gets toggled. 290 * 291 * 3) Set the data and control ports to a value of 0 292 * 293 * This probe routine has been tested on Epson Lx-800, HP LJ3P, 294 * Epson FX-1170 and C.Itoh 8510RM 295 * printers. 296 * Quick exit on fail added. 297 */ 298 static int 299 lpt_detect(device_t dev) 300 { 301 device_t ppbus = device_get_parent(dev); 302 303 static u_char testbyte[18] = { 304 0x55, /* alternating zeros */ 305 0xaa, /* alternating ones */ 306 0xfe, 0xfd, 0xfb, 0xf7, 307 0xef, 0xdf, 0xbf, 0x7f, /* walking zero */ 308 0x01, 0x02, 0x04, 0x08, 309 0x10, 0x20, 0x40, 0x80 /* walking one */ 310 }; 311 int i, error, status; 312 313 status = 1; /* assume success */ 314 315 ppb_lock(ppbus); 316 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 317 ppb_unlock(ppbus); 318 device_printf(dev, "cannot alloc ppbus (%d)!\n", error); 319 return (0); 320 } 321 322 for (i = 0; i < 18 && status; i++) 323 if (!lpt_port_test(ppbus, testbyte[i], 0xff)) { 324 status = 0; 325 break; 326 } 327 328 /* write 0's to control and data ports */ 329 ppb_wdtr(ppbus, 0); 330 ppb_wctr(ppbus, 0); 331 332 lpt_release_ppbus(dev); 333 ppb_unlock(ppbus); 334 335 return (status); 336 } 337 338 static void 339 lpt_identify(driver_t *driver, device_t parent) 340 { 341 342 device_t dev; 343 344 dev = device_find_child(parent, LPT_NAME, -1); 345 if (!dev) 346 BUS_ADD_CHILD(parent, 0, LPT_NAME, -1); 347 } 348 349 /* 350 * lpt_probe() 351 */ 352 static int 353 lpt_probe(device_t dev) 354 { 355 356 if (!lpt_detect(dev)) 357 return (ENXIO); 358 359 device_set_desc(dev, "Printer"); 360 361 return (0); 362 } 363 364 static int 365 lpt_attach(device_t dev) 366 { 367 device_t ppbus = device_get_parent(dev); 368 struct lpt_data *sc = DEVTOSOFTC(dev); 369 int rid = 0, unit = device_get_unit(dev); 370 int error; 371 372 sc->sc_primed = 0; /* not primed yet */ 373 ppb_init_callout(ppbus, &sc->sc_timer, 0); 374 375 ppb_lock(ppbus); 376 if ((error = lpt_request_ppbus(dev, PPB_DONTWAIT))) { 377 ppb_unlock(ppbus); 378 device_printf(dev, "cannot alloc ppbus (%d)!\n", error); 379 return (0); 380 } 381 382 ppb_wctr(ppbus, LPC_NINIT); 383 lpt_release_ppbus(dev); 384 ppb_unlock(ppbus); 385 386 /* declare our interrupt handler */ 387 sc->sc_intr_resource = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 388 RF_SHAREABLE); 389 if (sc->sc_intr_resource) { 390 error = bus_setup_intr(dev, sc->sc_intr_resource, 391 INTR_TYPE_TTY | INTR_MPSAFE, NULL, lptintr, sc, 392 &sc->sc_intr_cookie); 393 if (error) { 394 bus_release_resource(dev, SYS_RES_IRQ, rid, 395 sc->sc_intr_resource); 396 device_printf(dev, 397 "Unable to register interrupt handler\n"); 398 return (error); 399 } 400 sc->sc_irq = LP_HAS_IRQ | LP_USE_IRQ | LP_ENABLE_IRQ; 401 device_printf(dev, "Interrupt-driven port\n"); 402 } else { 403 sc->sc_irq = 0; 404 device_printf(dev, "Polled port\n"); 405 } 406 lprintf(("irq %x\n", sc->sc_irq)); 407 408 sc->sc_inbuf = malloc(BUFSIZE, M_DEVBUF, M_WAITOK); 409 sc->sc_statbuf = malloc(BUFSTATSIZE, M_DEVBUF, M_WAITOK); 410 sc->sc_dev = dev; 411 sc->sc_cdev = make_dev(&lpt_cdevsw, unit, 412 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d", unit); 413 sc->sc_cdev->si_drv1 = sc; 414 sc->sc_cdev->si_drv2 = 0; 415 sc->sc_cdev_bypass = make_dev(&lpt_cdevsw, unit, 416 UID_ROOT, GID_WHEEL, 0600, LPT_NAME "%d.ctl", unit); 417 sc->sc_cdev_bypass->si_drv1 = sc; 418 sc->sc_cdev_bypass->si_drv2 = (void *)LP_BYPASS; 419 return (0); 420 } 421 422 static int 423 lpt_detach(device_t dev) 424 { 425 struct lpt_data *sc = DEVTOSOFTC(dev); 426 device_t ppbus = device_get_parent(dev); 427 428 destroy_dev(sc->sc_cdev); 429 destroy_dev(sc->sc_cdev_bypass); 430 ppb_lock(ppbus); 431 lpt_release_ppbus(dev); 432 ppb_unlock(ppbus); 433 callout_drain(&sc->sc_timer); 434 if (sc->sc_intr_resource != NULL) { 435 bus_teardown_intr(dev, sc->sc_intr_resource, 436 sc->sc_intr_cookie); 437 bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_intr_resource); 438 } 439 free(sc->sc_inbuf, M_DEVBUF); 440 free(sc->sc_statbuf, M_DEVBUF); 441 442 return (0); 443 } 444 445 static void 446 lptout(void *arg) 447 { 448 struct lpt_data *sc = arg; 449 device_t dev = sc->sc_dev; 450 device_t ppbus; 451 452 ppbus = device_get_parent(dev); 453 ppb_assert_locked(ppbus); 454 lprintf(("T %x ", ppb_rstr(ppbus))); 455 if (sc->sc_state & OPEN) { 456 sc->sc_backoff++; 457 if (sc->sc_backoff > hz/LPTOUTMAX) 458 sc->sc_backoff = hz/LPTOUTMAX; 459 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc); 460 } else 461 sc->sc_state &= ~TOUT; 462 463 if (sc->sc_state & EERROR) 464 sc->sc_state &= ~EERROR; 465 466 /* 467 * Avoid possible hangs due to missed interrupts 468 */ 469 if (sc->sc_xfercnt) { 470 lptintr(sc); 471 } else { 472 sc->sc_state &= ~OBUSY; 473 wakeup(dev); 474 } 475 } 476 477 /* 478 * lptopen -- reset the printer, then wait until it's selected and not busy. 479 * If LP_BYPASS flag is selected, then we do not try to select the 480 * printer -- this is just used for passing ioctls. 481 */ 482 483 static int 484 lptopen(struct cdev *dev, int flags, int fmt, struct thread *td) 485 { 486 int trys, err; 487 struct lpt_data *sc = dev->si_drv1; 488 device_t lptdev; 489 device_t ppbus; 490 491 if (!sc) 492 return (ENXIO); 493 494 lptdev = sc->sc_dev; 495 ppbus = device_get_parent(lptdev); 496 497 ppb_lock(ppbus); 498 if (sc->sc_state) { 499 lprintf(("%s: still open %x\n", device_get_nameunit(lptdev), 500 sc->sc_state)); 501 ppb_unlock(ppbus); 502 return(EBUSY); 503 } else 504 sc->sc_state |= LPTINIT; 505 506 sc->sc_flags = (uintptr_t)dev->si_drv2; 507 508 /* Check for open with BYPASS flag set. */ 509 if (sc->sc_flags & LP_BYPASS) { 510 sc->sc_state = OPEN; 511 ppb_unlock(ppbus); 512 return(0); 513 } 514 515 /* request the ppbus only if we don't have it already */ 516 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 517 /* give it a chance to try later */ 518 sc->sc_state = 0; 519 ppb_unlock(ppbus); 520 return (err); 521 } 522 523 lprintf(("%s flags 0x%x\n", device_get_nameunit(lptdev), 524 sc->sc_flags)); 525 526 /* set IRQ status according to ENABLE_IRQ flag 527 */ 528 if (sc->sc_irq & LP_ENABLE_IRQ) 529 sc->sc_irq |= LP_USE_IRQ; 530 else 531 sc->sc_irq &= ~LP_USE_IRQ; 532 533 /* init printer */ 534 if ((sc->sc_flags & LP_NO_PRIME) == 0) { 535 if ((sc->sc_flags & LP_PRIMEOPEN) || sc->sc_primed == 0) { 536 ppb_wctr(ppbus, 0); 537 sc->sc_primed++; 538 DELAY(500); 539 } 540 } 541 542 ppb_wctr(ppbus, LPC_SEL|LPC_NINIT); 543 544 /* wait till ready (printer running diagnostics) */ 545 trys = 0; 546 do { 547 /* ran out of waiting for the printer */ 548 if (trys++ >= LPINITRDY*4) { 549 lprintf(("status %x\n", ppb_rstr(ppbus))); 550 551 lpt_release_ppbus(lptdev); 552 sc->sc_state = 0; 553 ppb_unlock(ppbus); 554 return (EBUSY); 555 } 556 557 /* wait 1/4 second, give up if we get a signal */ 558 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lptinit", 559 hz / 4) != EWOULDBLOCK) { 560 lpt_release_ppbus(lptdev); 561 sc->sc_state = 0; 562 ppb_unlock(ppbus); 563 return (EBUSY); 564 } 565 566 /* is printer online and ready for output */ 567 } while ((ppb_rstr(ppbus) & 568 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 569 (LPS_SEL|LPS_NBSY|LPS_NERR)); 570 571 sc->sc_control = LPC_SEL|LPC_NINIT; 572 if (sc->sc_flags & LP_AUTOLF) 573 sc->sc_control |= LPC_AUTOL; 574 575 /* enable interrupt if interrupt-driven */ 576 if (sc->sc_irq & LP_USE_IRQ) 577 sc->sc_control |= LPC_ENA; 578 579 ppb_wctr(ppbus, sc->sc_control); 580 581 sc->sc_state &= ~LPTINIT; 582 sc->sc_state |= OPEN; 583 sc->sc_xfercnt = 0; 584 585 /* only use timeout if using interrupt */ 586 lprintf(("irq %x\n", sc->sc_irq)); 587 if (sc->sc_irq & LP_USE_IRQ) { 588 sc->sc_state |= TOUT; 589 sc->sc_backoff = hz / LPTOUTINITIAL; 590 callout_reset(&sc->sc_timer, sc->sc_backoff, lptout, sc); 591 } 592 593 /* release the ppbus */ 594 lpt_release_ppbus(lptdev); 595 ppb_unlock(ppbus); 596 597 lprintf(("opened.\n")); 598 return(0); 599 } 600 601 /* 602 * lptclose -- close the device, free the local line buffer. 603 * 604 * Check for interrupted write call added. 605 */ 606 607 static int 608 lptclose(struct cdev *dev, int flags, int fmt, struct thread *td) 609 { 610 struct lpt_data *sc = dev->si_drv1; 611 device_t lptdev = sc->sc_dev; 612 device_t ppbus = device_get_parent(lptdev); 613 int err; 614 615 ppb_lock(ppbus); 616 if (sc->sc_flags & LP_BYPASS) 617 goto end_close; 618 619 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 620 ppb_unlock(ppbus); 621 return (err); 622 } 623 624 /* if the last write was interrupted, don't complete it */ 625 if ((!(sc->sc_state & INTERRUPTED)) && (sc->sc_irq & LP_USE_IRQ)) 626 while ((ppb_rstr(ppbus) & 627 (LPS_SEL|LPS_OUT|LPS_NBSY|LPS_NERR)) != 628 (LPS_SEL|LPS_NBSY|LPS_NERR) || sc->sc_xfercnt) 629 /* wait 1 second, give up if we get a signal */ 630 if (ppb_sleep(ppbus, lptdev, LPPRI | PCATCH, "lpclose", 631 hz) != EWOULDBLOCK) 632 break; 633 634 sc->sc_state &= ~OPEN; 635 callout_stop(&sc->sc_timer); 636 ppb_wctr(ppbus, LPC_NINIT); 637 638 /* 639 * unregistration of interrupt forced by release 640 */ 641 lpt_release_ppbus(lptdev); 642 643 end_close: 644 sc->sc_state = 0; 645 sc->sc_xfercnt = 0; 646 ppb_unlock(ppbus); 647 lprintf(("closed.\n")); 648 return(0); 649 } 650 651 /* 652 * lpt_pushbytes() 653 * Workhorse for actually spinning and writing bytes to printer 654 * Derived from lpa.c 655 * Originally by ? 656 * 657 * This code is only used when we are polling the port 658 */ 659 static int 660 lpt_pushbytes(struct lpt_data *sc) 661 { 662 device_t dev = sc->sc_dev; 663 device_t ppbus = device_get_parent(dev); 664 int spin, err, tic; 665 char ch; 666 667 ppb_assert_locked(ppbus); 668 lprintf(("p")); 669 /* loop for every character .. */ 670 while (sc->sc_xfercnt > 0) { 671 /* printer data */ 672 ch = *(sc->sc_cp); 673 sc->sc_cp++; 674 sc->sc_xfercnt--; 675 676 /* 677 * Wait for printer ready. 678 * Loop 20 usecs testing BUSY bit, then sleep 679 * for exponentially increasing timeout. (vak) 680 */ 681 for (spin = 0; NOT_READY(ppbus) && spin < MAX_SPIN; ++spin) 682 DELAY(1); /* XXX delay is NOT this accurate! */ 683 if (spin >= MAX_SPIN) { 684 tic = 0; 685 while (NOT_READY(ppbus)) { 686 /* 687 * Now sleep, every cycle a 688 * little longer .. 689 */ 690 tic = tic + tic + 1; 691 /* 692 * But no more than 10 seconds. (vak) 693 */ 694 if (tic > MAX_SLEEP) 695 tic = MAX_SLEEP; 696 err = ppb_sleep(ppbus, dev, LPPRI, 697 LPT_NAME "poll", tic); 698 if (err != EWOULDBLOCK) { 699 return (err); 700 } 701 } 702 } 703 704 /* output data */ 705 ppb_wdtr(ppbus, ch); 706 /* strobe */ 707 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 708 ppb_wctr(ppbus, sc->sc_control); 709 710 } 711 return(0); 712 } 713 714 /* 715 * lptread --retrieve printer status in IEEE1284 NIBBLE mode 716 */ 717 718 static int 719 lptread(struct cdev *dev, struct uio *uio, int ioflag) 720 { 721 struct lpt_data *sc = dev->si_drv1; 722 device_t lptdev = sc->sc_dev; 723 device_t ppbus = device_get_parent(lptdev); 724 int error = 0, len; 725 726 if (sc->sc_flags & LP_BYPASS) { 727 /* we can't do reads in bypass mode */ 728 return (EPERM); 729 } 730 731 ppb_lock(ppbus); 732 if ((error = ppb_1284_negociate(ppbus, PPB_NIBBLE, 0))) { 733 ppb_unlock(ppbus); 734 return (error); 735 } 736 737 /* read data in an other buffer, read/write may be simultaneous */ 738 len = 0; 739 while (uio->uio_resid) { 740 if ((error = ppb_1284_read(ppbus, PPB_NIBBLE, 741 sc->sc_statbuf, min(BUFSTATSIZE, 742 uio->uio_resid), &len))) { 743 goto error; 744 } 745 746 if (!len) 747 goto error; /* no more data */ 748 749 ppb_unlock(ppbus); 750 error = uiomove(sc->sc_statbuf, len, uio); 751 ppb_lock(ppbus); 752 if (error) 753 goto error; 754 } 755 756 error: 757 ppb_1284_terminate(ppbus); 758 ppb_unlock(ppbus); 759 return (error); 760 } 761 762 /* 763 * lptwrite --copy a line from user space to a local buffer, then call 764 * putc to get the chars moved to the output queue. 765 * 766 * Flagging of interrupted write added. 767 */ 768 769 static int 770 lptwrite(struct cdev *dev, struct uio *uio, int ioflag) 771 { 772 register unsigned n; 773 int err; 774 struct lpt_data *sc = dev->si_drv1; 775 device_t lptdev = sc->sc_dev; 776 device_t ppbus = device_get_parent(lptdev); 777 778 if (sc->sc_flags & LP_BYPASS) { 779 /* we can't do writes in bypass mode */ 780 return (EPERM); 781 } 782 783 /* request the ppbus only if we don't have it already */ 784 ppb_lock(ppbus); 785 if ((err = lpt_request_ppbus(lptdev, PPB_WAIT|PPB_INTR)) != 0) { 786 ppb_unlock(ppbus); 787 return (err); 788 } 789 790 sc->sc_state &= ~INTERRUPTED; 791 while ((n = min(BUFSIZE, uio->uio_resid)) != 0) { 792 sc->sc_cp = sc->sc_inbuf; 793 ppb_unlock(ppbus); 794 err = uiomove(sc->sc_cp, n, uio); 795 ppb_lock(ppbus); 796 if (err) 797 break; 798 sc->sc_xfercnt = n; 799 800 if (sc->sc_irq & LP_ENABLE_EXT) { 801 /* try any extended mode */ 802 err = ppb_write(ppbus, sc->sc_cp, 803 sc->sc_xfercnt, 0); 804 switch (err) { 805 case 0: 806 /* if not all data was sent, we could rely 807 * on polling for the last bytes */ 808 sc->sc_xfercnt = 0; 809 break; 810 case EINTR: 811 sc->sc_state |= INTERRUPTED; 812 ppb_unlock(ppbus); 813 return (err); 814 case EINVAL: 815 /* advanced mode not avail */ 816 log(LOG_NOTICE, 817 "%s: advanced mode not avail, polling\n", 818 device_get_nameunit(sc->sc_dev)); 819 break; 820 default: 821 ppb_unlock(ppbus); 822 return (err); 823 } 824 } else while ((sc->sc_xfercnt > 0)&&(sc->sc_irq & LP_USE_IRQ)) { 825 lprintf(("i")); 826 /* if the printer is ready for a char, */ 827 /* give it one */ 828 if ((sc->sc_state & OBUSY) == 0){ 829 lprintf(("\nC %d. ", sc->sc_xfercnt)); 830 lptintr(sc); 831 } 832 lprintf(("W ")); 833 if (sc->sc_state & OBUSY) 834 if ((err = ppb_sleep(ppbus, lptdev, 835 LPPRI|PCATCH, LPT_NAME "write", 0))) { 836 sc->sc_state |= INTERRUPTED; 837 ppb_unlock(ppbus); 838 return(err); 839 } 840 } 841 842 /* check to see if we must do a polled write */ 843 if (!(sc->sc_irq & LP_USE_IRQ) && (sc->sc_xfercnt)) { 844 lprintf(("p")); 845 846 err = lpt_pushbytes(sc); 847 848 if (err) { 849 ppb_unlock(ppbus); 850 return (err); 851 } 852 } 853 } 854 855 /* we have not been interrupted, release the ppbus */ 856 lpt_release_ppbus(lptdev); 857 ppb_unlock(ppbus); 858 859 return (err); 860 } 861 862 /* 863 * lptintr -- handle printer interrupts which occur when the printer is 864 * ready to accept another char. 865 * 866 * do checking for interrupted write call. 867 */ 868 static void 869 lptintr(void *arg) 870 { 871 struct lpt_data *sc = arg; 872 device_t lptdev = sc->sc_dev; 873 device_t ppbus = device_get_parent(lptdev); 874 int sts = 0; 875 int i; 876 877 /* 878 * Is printer online and ready for output? 879 * 880 * Avoid falling back to lptout() too quickly. First spin-loop 881 * to see if the printer will become ready ``really soon now''. 882 */ 883 for (i = 0; i < 100 && 884 ((sts=ppb_rstr(ppbus)) & RDY_MASK) != LP_READY; i++) ; 885 886 if ((sts & RDY_MASK) == LP_READY) { 887 sc->sc_state = (sc->sc_state | OBUSY) & ~EERROR; 888 sc->sc_backoff = hz / LPTOUTINITIAL; 889 890 if (sc->sc_xfercnt) { 891 /* send char */ 892 /*lprintf(("%x ", *sc->sc_cp)); */ 893 ppb_wdtr(ppbus, *sc->sc_cp++) ; 894 ppb_wctr(ppbus, sc->sc_control|LPC_STB); 895 /* DELAY(X) */ 896 ppb_wctr(ppbus, sc->sc_control); 897 898 /* any more data for printer */ 899 if (--(sc->sc_xfercnt) > 0) 900 return; 901 } 902 903 /* 904 * No more data waiting for printer. 905 * Wakeup is not done if write call was not interrupted. 906 */ 907 sc->sc_state &= ~OBUSY; 908 909 if (!(sc->sc_state & INTERRUPTED)) 910 wakeup(lptdev); 911 lprintf(("w ")); 912 return; 913 } else { /* check for error */ 914 if (((sts & (LPS_NERR | LPS_OUT) ) != LPS_NERR) && 915 (sc->sc_state & OPEN)) 916 sc->sc_state |= EERROR; 917 /* lptout() will jump in and try to restart. */ 918 } 919 lprintf(("sts %x ", sts)); 920 } 921 922 static int 923 lptioctl(struct cdev *dev, u_long cmd, caddr_t data, int flags, struct thread *td) 924 { 925 int error = 0; 926 struct lpt_data *sc = dev->si_drv1; 927 device_t ppbus; 928 u_char old_sc_irq; /* old printer IRQ status */ 929 930 switch (cmd) { 931 case LPT_IRQ : 932 ppbus = device_get_parent(sc->sc_dev); 933 ppb_lock(ppbus); 934 if (sc->sc_irq & LP_HAS_IRQ) { 935 /* 936 * NOTE: 937 * If the IRQ status is changed, 938 * this will only be visible on the 939 * next open. 940 * 941 * If interrupt status changes, 942 * this gets syslog'd. 943 */ 944 old_sc_irq = sc->sc_irq; 945 switch (*(int*)data) { 946 case 0: 947 sc->sc_irq &= (~LP_ENABLE_IRQ); 948 break; 949 case 1: 950 sc->sc_irq &= (~LP_ENABLE_EXT); 951 sc->sc_irq |= LP_ENABLE_IRQ; 952 break; 953 case 2: 954 /* classic irq based transfer and advanced 955 * modes are in conflict 956 */ 957 sc->sc_irq &= (~LP_ENABLE_IRQ); 958 sc->sc_irq |= LP_ENABLE_EXT; 959 break; 960 case 3: 961 sc->sc_irq &= (~LP_ENABLE_EXT); 962 break; 963 default: 964 break; 965 } 966 967 if (old_sc_irq != sc->sc_irq ) 968 log(LOG_NOTICE, "%s: switched to %s %s mode\n", 969 device_get_nameunit(sc->sc_dev), 970 (sc->sc_irq & LP_ENABLE_IRQ)? 971 "interrupt-driven":"polled", 972 (sc->sc_irq & LP_ENABLE_EXT)? 973 "extended":"standard"); 974 } else /* polled port */ 975 error = EOPNOTSUPP; 976 ppb_unlock(ppbus); 977 break; 978 default: 979 error = ENODEV; 980 } 981 982 return(error); 983 } 984 985 static device_method_t lpt_methods[] = { 986 /* device interface */ 987 DEVMETHOD(device_identify, lpt_identify), 988 DEVMETHOD(device_probe, lpt_probe), 989 DEVMETHOD(device_attach, lpt_attach), 990 DEVMETHOD(device_detach, lpt_detach), 991 992 { 0, 0 } 993 }; 994 995 static driver_t lpt_driver = { 996 LPT_NAME, 997 lpt_methods, 998 sizeof(struct lpt_data), 999 }; 1000 1001 DRIVER_MODULE(lpt, ppbus, lpt_driver, lpt_devclass, 0, 0); 1002 MODULE_DEPEND(lpt, ppbus, 1, 1, 1);
Cache object: 1c445a01cf5176dfd05b353ccf65e3e0
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