1 /* $NetBSD: ppbus_1284.c,v 1.14 2021/11/14 20:51:57 andvar Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 Nicolas Souchu 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 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * FreeBSD: src/sys/dev/ppbus/ppb_1284.c,v 1.11 2000/01/14 08:03:14 nsouch Exp 29 * 30 */ 31 32 /* General purpose routines for the IEEE1284-1994 Standard */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: ppbus_1284.c,v 1.14 2021/11/14 20:51:57 andvar Exp $"); 36 37 #include "opt_ppbus_1284.h" 38 39 #include <sys/param.h> 40 #include <sys/malloc.h> 41 #include <sys/systm.h> 42 43 #include <dev/ppbus/ppbus_conf.h> 44 #include <dev/ppbus/ppbus_base.h> 45 #include <dev/ppbus/ppbus_1284.h> 46 #include <dev/ppbus/ppbus_io.h> 47 #include <dev/ppbus/ppbus_var.h> 48 49 50 /* Wait for the peripheral up to 40ms */ 51 static int 52 do_1284_wait(struct ppbus_softc * bus, char mask, char status) 53 { 54 return (ppbus_poll_bus(bus->sc_dev, 4, mask, status, 55 PPBUS_NOINTR | PPBUS_POLL)); 56 } 57 58 /* Wait for the host up to 1 second (peripheral side) */ 59 static int 60 do_peripheral_wait(struct ppbus_softc * bus, char mask, char status) 61 { 62 return (ppbus_poll_bus(bus->sc_dev, 100, mask, status, 63 PPBUS_NOINTR | PPBUS_POLL)); 64 } 65 66 67 /* Unconditionally reset the error field */ 68 static int 69 ppbus_1284_reset_error(struct ppbus_softc * bus, int state) 70 { 71 bus->sc_1284_error = PPBUS_NO_ERROR; 72 bus->sc_1284_state = state; 73 return 0; 74 } 75 76 77 /* Get IEEE1284 state */ 78 int 79 ppbus_1284_get_state(device_t dev) 80 { 81 struct ppbus_softc *sc = device_private(dev); 82 83 return sc->sc_1284_state; 84 } 85 86 87 /* Set IEEE1284 state if no error occurred */ 88 int 89 ppbus_1284_set_state(device_t dev, int state) 90 { 91 struct ppbus_softc * bus = device_private(dev); 92 93 /* call ppbus_1284_reset_error() if you absolutly want to change 94 * the state from PPBUS_ERROR to another */ 95 if ((bus->sc_1284_state != PPBUS_ERROR) && 96 (bus->sc_1284_error == PPBUS_NO_ERROR)) { 97 bus->sc_1284_state = state; 98 bus->sc_1284_error = PPBUS_NO_ERROR; 99 } 100 101 return 0; 102 } 103 104 105 /* Set the IEEE1284 error field */ 106 static int 107 ppbus_1284_set_error(struct ppbus_softc * bus, int error, int event) 108 { 109 /* do not accumulate errors */ 110 if ((bus->sc_1284_error == PPBUS_NO_ERROR) && 111 (bus->sc_1284_state != PPBUS_ERROR)) { 112 bus->sc_1284_error = error; 113 bus->sc_1284_state = PPBUS_ERROR; 114 } 115 116 #ifdef DEBUG_1284 117 printf("%s<1284>: error=%d status=0x%x event=%d\n", 118 device_xname(bus->sc_dev), error, ppbus_rstr(bus->sc_dev), 119 event); 120 121 #endif 122 123 return 0; 124 } 125 126 127 /* Converts mode+options into ext. value */ 128 static int 129 ppbus_request_mode(int mode, int options) 130 { 131 int request_mode = 0; 132 133 if (options & PPBUS_EXTENSIBILITY_LINK) { 134 request_mode = EXT_LINK_1284_NORMAL; 135 136 } 137 else { 138 switch (mode) { 139 case PPBUS_NIBBLE: 140 request_mode = (options & PPBUS_REQUEST_ID) ? 141 NIBBLE_1284_REQUEST_ID : 142 NIBBLE_1284_NORMAL; 143 break; 144 case PPBUS_PS2: 145 request_mode = (options & PPBUS_REQUEST_ID) ? 146 BYTE_1284_REQUEST_ID : 147 BYTE_1284_NORMAL; 148 break; 149 case PPBUS_ECP: 150 if (options & PPBUS_USE_RLE) 151 request_mode = (options & PPBUS_REQUEST_ID) ? 152 ECP_1284_RLE_REQUEST_ID : 153 ECP_1284_RLE; 154 else 155 request_mode = (options & PPBUS_REQUEST_ID) ? 156 ECP_1284_REQUEST_ID : 157 ECP_1284_NORMAL; 158 break; 159 case PPBUS_EPP: 160 request_mode = EPP_1284_NORMAL; 161 break; 162 default: 163 panic("%s: unsupported mode %d\n", __func__, mode); 164 } 165 } 166 167 return (request_mode); 168 } 169 170 171 /* Negotiate the peripheral side */ 172 int 173 ppbus_peripheral_negotiate(device_t dev, int mode, int options) 174 { 175 struct ppbus_softc * bus = device_private(dev); 176 int spin, request_mode, error = 0; 177 char r; 178 179 ppbus_1284_terminate(dev); 180 ppbus_1284_set_state(dev, PPBUS_PERIPHERAL_NEGOTIATION); 181 182 /* compute ext. value */ 183 request_mode = ppbus_request_mode(mode, options); 184 185 /* wait host */ 186 spin = 10; 187 while (spin-- && (ppbus_rstr(dev) & nBUSY)) 188 DELAY(1); 189 190 /* check termination */ 191 if (!(ppbus_rstr(dev) & SELECT) || !spin) { 192 error = ENODEV; 193 goto error; 194 } 195 196 /* Event 4 - read ext. value */ 197 r = ppbus_rdtr(dev); 198 199 /* nibble mode is not supported */ 200 if ((r == (char)request_mode) || 201 (r == NIBBLE_1284_NORMAL)) { 202 203 /* Event 5 - restore direction bit, no data avail */ 204 ppbus_wctr(dev, (STROBE | nINIT) & ~(SELECTIN)); 205 DELAY(1); 206 207 /* Event 6 */ 208 ppbus_wctr(dev, (nINIT) & ~(SELECTIN | STROBE)); 209 210 if (r == NIBBLE_1284_NORMAL) { 211 #ifdef DEBUG_1284 212 printf("R"); 213 #endif 214 ppbus_1284_set_error(bus, PPBUS_MODE_UNSUPPORTED, 4); 215 error = EINVAL; 216 goto error; 217 } 218 else { 219 ppbus_1284_set_state(dev, PPBUS_PERIPHERAL_IDLE); 220 #ifdef DEBUG_1284 221 printf("A"); 222 #endif 223 /* negotiation succeeds */ 224 } 225 } 226 else { 227 /* Event 5 - mode not supported */ 228 ppbus_wctr(dev, SELECTIN); 229 DELAY(1); 230 231 /* Event 6 */ 232 ppbus_wctr(dev, (SELECTIN) & ~(STROBE | nINIT)); 233 ppbus_1284_set_error(bus, PPBUS_MODE_UNSUPPORTED, 4); 234 235 #ifdef DEBUG_1284 236 printf("r"); 237 #endif 238 error = EINVAL; 239 goto error; 240 } 241 242 return (0); 243 244 error: 245 ppbus_peripheral_terminate(dev, PPBUS_WAIT); 246 return (error); 247 } 248 249 250 /* Terminate peripheral transfer side. Always return 0 in compatible mode */ 251 int 252 ppbus_peripheral_terminate(device_t dev, int how) 253 { 254 struct ppbus_softc * bus = device_private(dev); 255 int error = 0; 256 257 #ifdef DEBUG_1284 258 printf("t"); 259 #endif 260 261 ppbus_1284_set_state(dev, PPBUS_PERIPHERAL_TERMINATION); 262 263 /* Event 22 - wait up to host response time (1s) */ 264 if ((error = do_peripheral_wait(bus, SELECT | nBUSY, 0))) { 265 ppbus_1284_set_error(bus, PPBUS_TIMEOUT, 22); 266 goto error; 267 } 268 269 /* Event 24 */ 270 ppbus_wctr(dev, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 271 272 /* Event 25 - wait up to host response time (1s) */ 273 if ((error = do_peripheral_wait(bus, nBUSY, nBUSY))) { 274 ppbus_1284_set_error(bus, PPBUS_TIMEOUT, 25); 275 goto error; 276 } 277 278 /* Event 26 */ 279 ppbus_wctr(dev, (SELECTIN | nINIT | STROBE) & ~(AUTOFEED)); 280 DELAY(1); 281 /* Event 27 */ 282 ppbus_wctr(dev, (SELECTIN | nINIT) & ~(STROBE | AUTOFEED)); 283 284 /* Event 28 - wait up to host response time (1s) */ 285 if ((error = do_peripheral_wait(bus, nBUSY, 0))) { 286 ppbus_1284_set_error(bus, PPBUS_TIMEOUT, 28); 287 goto error; 288 } 289 290 error: 291 ppbus_1284_terminate(dev); 292 ppbus_1284_set_state(dev, PPBUS_FORWARD_IDLE); 293 294 return (0); 295 } 296 297 298 /* Write 1 byte to host in BYTE mode (peripheral side) */ 299 static int 300 byte_peripheral_outbyte(device_t dev, char *buffer, int last) 301 { 302 struct ppbus_softc * bus = device_private(dev); 303 int error = 0; 304 305 /* Event 7 */ 306 if ((error = do_1284_wait(bus, nBUSY, nBUSY))) { 307 ppbus_1284_set_error(bus, PPBUS_TIMEOUT, 7); 308 goto error; 309 } 310 311 /* check termination */ 312 if (!(ppbus_rstr(dev) & SELECT)) { 313 ppbus_peripheral_terminate(dev, PPBUS_WAIT); 314 goto error; 315 } 316 317 /* Event 15 - put byte on data lines */ 318 #ifdef DEBUG_1284 319 printf("B"); 320 #endif 321 ppbus_wdtr(dev, *buffer); 322 323 /* Event 9 */ 324 ppbus_wctr(dev, (AUTOFEED | STROBE) & ~(nINIT | SELECTIN)); 325 326 /* Event 10 - wait data read */ 327 if ((error = do_peripheral_wait(bus, nBUSY, 0))) { 328 ppbus_1284_set_error(bus, PPBUS_TIMEOUT, 16); 329 goto error; 330 } 331 332 /* Event 11 */ 333 if (!last) { 334 ppbus_wctr(dev, (AUTOFEED) & ~(nINIT | STROBE | SELECTIN)); 335 } else { 336 ppbus_wctr(dev, (nINIT) & ~(STROBE | SELECTIN | AUTOFEED)); 337 } 338 339 #if 0 340 /* Event 16 - wait strobe */ 341 if ((error = do_peripheral_wait(bus, nACK | nBUSY, 0))) { 342 ppbus_1284_set_error(bus, PPBUS_TIMEOUT, 16); 343 goto error; 344 } 345 #endif 346 347 /* check termination */ 348 if (!(ppbus_rstr(dev) & SELECT)) { 349 ppbus_peripheral_terminate(dev, PPBUS_WAIT); 350 goto error; 351 } 352 353 error: 354 return (error); 355 } 356 357 358 /* Write n bytes to host in BYTE mode (peripheral side) */ 359 int 360 byte_peripheral_write(device_t dev, char *buffer, int len, 361 int *sent) 362 { 363 int error = 0, i; 364 char r; 365 366 ppbus_1284_set_state(dev, PPBUS_PERIPHERAL_TRANSFER); 367 368 /* wait forever, the remote host is master and should initiate 369 * termination 370 */ 371 for(i = 0; i < len; i++) { 372 /* force remote nFAULT low to release the remote waiting 373 * process, if any 374 */ 375 r = ppbus_rctr(dev); 376 ppbus_wctr(dev, r & ~nINIT); 377 378 #ifdef DEBUG_1284 379 printf("y"); 380 #endif 381 /* Event 7 */ 382 error = ppbus_poll_bus(dev, PPBUS_FOREVER, nBUSY, nBUSY, 383 PPBUS_INTR); 384 385 if (error && error != EWOULDBLOCK) 386 goto error; 387 388 #ifdef DEBUG_1284 389 printf("b"); 390 #endif 391 if ((error = byte_peripheral_outbyte(dev, buffer+i, (i == len-1)))) 392 goto error; 393 } 394 error: 395 if (!error) 396 ppbus_1284_set_state(dev, PPBUS_PERIPHERAL_IDLE); 397 398 *sent = i; 399 return (error); 400 } 401 402 403 /* Read the device ID using the specified mode */ 404 int 405 ppbus_1284_read_id(device_t dev, int mode, char ** buffer, 406 size_t * size, size_t * read) 407 { 408 u_int16_t msg_sz; 409 u_int8_t length_field; 410 u_int8_t old_mode; 411 int error; 412 int old_ivar; 413 int new_ivar = 1; 414 415 error = ppbus_read_ivar(dev, PPBUS_IVAR_IEEE, &old_ivar); 416 if(error) { 417 printf("%s(%s): error reading PPBUS_IVAR_IEEE.\n", __func__, 418 device_xname(dev)); 419 return error; 420 } 421 if(old_ivar == 0) { 422 error = ppbus_write_ivar(dev, PPBUS_IVAR_IEEE, &new_ivar); 423 if(error) { 424 printf("%s(%s): error enabling IEEE usage.\n", __func__, 425 device_xname(dev)); 426 return error; 427 } 428 } 429 430 old_mode = ppbus_get_mode(dev); 431 switch (mode) { 432 case PPBUS_NIBBLE: 433 case PPBUS_ECP: 434 case PPBUS_BYTE: 435 error = ppbus_set_mode(dev, mode, PPBUS_REQUEST_ID); 436 if(error) { 437 printf("%s(%s): error setting bus mode.\n", __func__, 438 device_xname(dev)); 439 goto end_read_id; 440 } 441 break; 442 default: 443 printf("%s(%s): mode does not support returning device ID.\n", 444 __func__, device_xname(dev)); 445 error = ENODEV; 446 goto end_read_id; 447 } 448 449 error = ppbus_read(dev, &length_field, 1, 0, read); 450 if(error) { 451 printf("%s(%s): error reading first byte.\n", __func__, 452 device_xname(dev)); 453 goto end_read_id; 454 } 455 msg_sz = length_field; 456 error = ppbus_read(dev, &length_field, 1, 0, read); 457 if(error) { 458 printf("%s(%s): error reading second byte.\n", 459 __func__, device_xname(dev)); 460 goto end_read_id; 461 } 462 msg_sz <<= 8; 463 msg_sz |= length_field; 464 msg_sz -= 2; 465 if(msg_sz <= 0) { 466 printf("%s(%s): device ID length <= 0.\n", __func__, 467 device_xname(dev)); 468 goto end_read_id; 469 } 470 *buffer = malloc(msg_sz, M_DEVBUF, M_WAITOK); 471 *size = msg_sz; 472 error = ppbus_read(dev, *buffer, msg_sz, 0, read); 473 474 end_read_id: 475 ppbus_set_mode(dev, old_mode, 0); 476 if(old_ivar == 0) { 477 if(ppbus_write_ivar(dev, PPBUS_IVAR_IEEE, &old_ivar)) { 478 printf("%s(%s): error restoring PPBUS_IVAR_IEEE.\n", 479 __func__, device_xname(dev)); 480 } 481 } 482 return (error); 483 } 484 485 /* 486 * IEEE1284 negotiation phase: after negotiation, nFAULT is low if data is 487 * available for reverse modes. 488 */ 489 int 490 ppbus_1284_negotiate(device_t dev, int mode, int options) 491 { 492 struct ppbus_softc * bus = device_private(dev); 493 int error; 494 int request_mode; 495 496 #ifdef DEBUG_1284 497 printf("n"); 498 #endif 499 500 if (ppbus_1284_get_state(dev) >= PPBUS_PERIPHERAL_NEGOTIATION) 501 ppbus_peripheral_terminate(dev, PPBUS_WAIT); 502 503 #ifdef DEBUG_1284 504 printf("%d", mode); 505 #endif 506 507 /* ensure the host is in compatible mode */ 508 ppbus_1284_terminate(dev); 509 510 /* reset error to catch the actual negotiation error */ 511 ppbus_1284_reset_error(bus, PPBUS_FORWARD_IDLE); 512 513 /* calculate ext. value */ 514 request_mode = ppbus_request_mode(mode, options); 515 516 /* default state */ 517 ppbus_wctr(dev, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 518 DELAY(1); 519 520 /* enter negotiation phase */ 521 ppbus_1284_set_state(dev, PPBUS_NEGOTIATION); 522 523 /* Event 0 - put the exten. value on the data lines */ 524 ppbus_wdtr(dev, request_mode); 525 526 #ifdef PERIPH_1284 527 /* request remote host attention */ 528 ppbus_wctr(dev, (nINIT | STROBE) & ~(AUTOFEED | SELECTIN)); 529 DELAY(1); 530 ppbus_wctr(dev, (nINIT) & ~(STROBE | AUTOFEED | SELECTIN)); 531 #else 532 DELAY(1); 533 534 #endif /* !PERIPH_1284 */ 535 536 /* Event 1 - enter IEEE1284 mode */ 537 ppbus_wctr(dev, (nINIT | AUTOFEED) & ~(STROBE | SELECTIN)); 538 539 #ifdef PERIPH_1284 540 /* ignore the PError line, wait a bit more, remote host's 541 * interrupts don't respond fast enough */ 542 if (ppbus_poll_bus(bus, 40, nACK | SELECT | nFAULT, 543 SELECT | nFAULT, PPBUS_NOINTR | PPBUS_POLL)) { 544 ppbus_1284_set_error(bus, PPBUS_NOT_IEEE1284, 2); 545 error = ENODEV; 546 goto error; 547 } 548 #else 549 /* Event 2 - trying IEEE1284 dialog */ 550 if (do_1284_wait(bus, nACK | PERROR | SELECT | nFAULT, 551 PERROR | SELECT | nFAULT)) { 552 ppbus_1284_set_error(bus, PPBUS_NOT_IEEE1284, 2); 553 error = ENODEV; 554 goto error; 555 } 556 #endif /* !PERIPH_1284 */ 557 558 /* Event 3 - latch the ext. value to the peripheral */ 559 ppbus_wctr(dev, (nINIT | STROBE | AUTOFEED) & ~SELECTIN); 560 DELAY(1); 561 562 /* Event 4 - IEEE1284 device recognized */ 563 ppbus_wctr(dev, nINIT & ~(SELECTIN | AUTOFEED | STROBE)); 564 565 /* Event 6 - waiting for status lines */ 566 if (do_1284_wait(bus, nACK, nACK)) { 567 ppbus_1284_set_error(bus, PPBUS_TIMEOUT, 6); 568 error = EBUSY; 569 goto error; 570 } 571 572 /* Event 7 - querying result consider nACK not to misunderstand 573 * a remote computer terminate sequence */ 574 if (options & PPBUS_EXTENSIBILITY_LINK) { 575 /* XXX not fully supported yet */ 576 ppbus_1284_terminate(dev); 577 error = ENODEV; 578 goto error; 579 /* return (0); */ 580 } 581 if (request_mode == NIBBLE_1284_NORMAL) { 582 if (do_1284_wait(bus, nACK | SELECT, nACK)) { 583 ppbus_1284_set_error(bus, PPBUS_MODE_UNSUPPORTED, 7); 584 error = ENODEV; 585 goto error; 586 } 587 } else { 588 if (do_1284_wait(bus, nACK | SELECT, SELECT | nACK)) { 589 ppbus_1284_set_error(bus, PPBUS_MODE_UNSUPPORTED, 7); 590 error = ENODEV; 591 goto error; 592 } 593 } 594 595 switch (mode) { 596 case PPBUS_NIBBLE: 597 case PPBUS_PS2: 598 /* enter reverse idle phase */ 599 ppbus_1284_set_state(dev, PPBUS_REVERSE_IDLE); 600 break; 601 case PPBUS_ECP: 602 /* negotiation ok, now setup the communication */ 603 ppbus_1284_set_state(dev, PPBUS_SETUP); 604 ppbus_wctr(dev, (nINIT | AUTOFEED) & ~(SELECTIN | STROBE)); 605 606 #ifdef PERIPH_1284 607 /* ignore PError line */ 608 if (do_1284_wait(bus, nACK | SELECT | nBUSY, 609 nACK | SELECT | nBUSY)) { 610 ppbus_1284_set_error(bus, PPBUS_TIMEOUT, 30); 611 error = ENODEV; 612 goto error; 613 } 614 #else 615 if (do_1284_wait(bus, nACK | SELECT | PERROR | nBUSY, 616 nACK | SELECT | PERROR | nBUSY)) { 617 ppbus_1284_set_error(bus, PPBUS_TIMEOUT, 30); 618 error = ENODEV; 619 goto error; 620 } 621 #endif /* !PERIPH_1284 */ 622 623 /* ok, the host enters the ForwardIdle state */ 624 ppbus_1284_set_state(dev, PPBUS_ECP_FORWARD_IDLE); 625 break; 626 case PPBUS_EPP: 627 ppbus_1284_set_state(dev, PPBUS_EPP_IDLE); 628 break; 629 default: 630 panic("%s: unknown mode (%d)!", __func__, mode); 631 } 632 633 return 0; 634 635 error: 636 ppbus_1284_terminate(dev); 637 return error; 638 } 639 640 /* 641 * IEEE1284 termination phase, return code should ignored since the host 642 * is _always_ in compatible mode after ppbus_1284_terminate() 643 */ 644 int 645 ppbus_1284_terminate(device_t dev) 646 { 647 struct ppbus_softc * bus = device_private(dev); 648 649 #ifdef DEBUG_1284 650 printf("T"); 651 #endif 652 653 /* do not reset error here to keep the error that 654 * may occurred before the ppbus_1284_terminate() call */ 655 ppbus_1284_set_state(dev, PPBUS_TERMINATION); 656 657 #ifdef PERIPH_1284 658 /* request remote host attention */ 659 ppbus_wctr(dev, (nINIT | STROBE | SELECTIN) & ~(AUTOFEED)); 660 DELAY(1); 661 #endif /* PERIPH_1284 */ 662 663 /* Event 22 - set nSelectin low and nAutoFeed high */ 664 ppbus_wctr(dev, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 665 666 /* Event 24 - waiting for peripheral, Xflag ignored */ 667 if (do_1284_wait(bus, nACK | nBUSY | nFAULT, nFAULT)) { 668 ppbus_1284_set_error(bus, PPBUS_TIMEOUT, 24); 669 goto error; 670 } 671 672 /* Event 25 - set nAutoFd low */ 673 ppbus_wctr(dev, (nINIT | SELECTIN | AUTOFEED) & ~STROBE); 674 675 /* Event 26 - compatible mode status is set */ 676 677 /* Event 27 - peripheral set nAck high */ 678 if (do_1284_wait(bus, nACK, nACK)) { 679 ppbus_1284_set_error(bus, PPBUS_TIMEOUT, 27); 680 } 681 682 /* Event 28 - end termination, return to idle phase */ 683 ppbus_wctr(dev, (nINIT | SELECTIN) & ~(STROBE | AUTOFEED)); 684 685 error: 686 ppbus_1284_set_state(dev, PPBUS_FORWARD_IDLE); 687 688 return (0); 689 } 690
Indexes created Sat Sep 20 22:09:52 GMT 2025