1 /* $NetBSD: lpt.c,v 1.83 2026/10/08 15:54:35 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994 Charles M. Hannum. 5 * Copyright (c) 1990 William F. Jolitz, TeleMuse 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This software is a component of "386BSD" developed by 19 * William F. Jolitz, TeleMuse. 20 * 4. Neither the name of the developer nor the name "386BSD" 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS A COMPONENT OF 386BSD DEVELOPED BY WILLIAM F. JOLITZ 25 * AND IS INTENDED FOR RESEARCH AND EDUCATIONAL PURPOSES ONLY. THIS 26 * SOFTWARE SHOULD NOT BE CONSIDERED TO BE A COMMERCIAL PRODUCT. 27 * THE DEVELOPER URGES THAT USERS WHO REQUIRE A COMMERCIAL PRODUCT 28 * NOT MAKE USE OF THIS WORK. 29 * 30 * FOR USERS WHO WISH TO UNDERSTAND THE 386BSD SYSTEM DEVELOPED 31 * BY WILLIAM F. JOLITZ, WE RECOMMEND THE USER STUDY WRITTEN 32 * REFERENCES SUCH AS THE "PORTING UNIX TO THE 386" SERIES 33 * (BEGINNING JANUARY 1991 "DR. DOBBS JOURNAL", USA AND BEGINNING 34 * JUNE 1991 "UNIX MAGAZIN", GERMANY) BY WILLIAM F. JOLITZ AND 35 * LYNNE GREER JOLITZ, AS WELL AS OTHER BOOKS ON UNIX AND THE 36 * ON-LINE 386BSD USER MANUAL BEFORE USE. A BOOK DISCUSSING THE INTERNALS 37 * OF 386BSD ENTITLED "386BSD FROM THE INSIDE OUT" WILL BE AVAILABLE LATE 1992. 38 * 39 * THIS SOFTWARE IS PROVIDED BY THE DEVELOPER ``AS IS'' AND 40 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 42 * ARE DISCLAIMED. IN NO EVENT SHALL THE DEVELOPER BE LIABLE 43 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 44 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 45 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 47 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 48 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 49 * SUCH DAMAGE. 50 */ 51 52 /* 53 * Device Driver for AT style parallel printer port 54 */ 55 56 #include <sys/cdefs.h> 57 __KERNEL_RCSID(0, "$NetBSD: lpt.c,v 1.83 2026/10/08 15:54:35 riastradh Exp $"); 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/proc.h> 62 #include <sys/malloc.h> 63 #include <sys/kernel.h> 64 #include <sys/ioctl.h> 65 #include <sys/uio.h> 66 #include <sys/device.h> 67 #include <sys/conf.h> 68 #include <sys/syslog.h> 69 #include <sys/intr.h> 70 71 #include <sys/bus.h> 72 73 #include <dev/ic/lptreg.h> 74 #include <dev/ic/lptvar.h> 75 76 #include "ioconf.h" 77 78 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 79 #define STEP hz/4 80 81 #define LPTPRI (PZERO+8) 82 #define LPT_BSIZE 1024 83 84 #define LPTDEBUG 85 86 #ifndef LPTDEBUG 87 #define LPRINTF(a) 88 #else 89 #define LPRINTF(a) if (lptdebug) printf a 90 int lptdebug = 0; 91 #endif 92 93 dev_type_open(lptopen); 94 dev_type_close(lptclose); 95 dev_type_write(lptwrite); 96 dev_type_ioctl(lptioctl); 97 98 const struct cdevsw lpt_cdevsw = { 99 .d_open = lptopen, 100 .d_close = lptclose, 101 .d_read = noread, 102 .d_write = lptwrite, 103 .d_ioctl = lptioctl, 104 .d_stop = nostop, 105 .d_tty = notty, 106 .d_poll = nopoll, 107 .d_mmap = nommap, 108 .d_kqfilter = nokqfilter, 109 .d_discard = nodiscard, 110 .d_flag = D_OTHER 111 }; 112 113 #define LPTUNIT(s) (minor(s) & 0x1f) 114 #define LPTFLAGS(s) (minor(s) & 0xe0) 115 116 static void lptsoftintr(void *); 117 118 void 119 lpt_attach_subr(struct lpt_softc *sc) 120 { 121 bus_space_tag_t iot; 122 bus_space_handle_t ioh; 123 124 sc->sc_state = 0; 125 126 iot = sc->sc_iot; 127 ioh = sc->sc_ioh; 128 129 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 130 131 callout_init(&sc->sc_wakeup_ch, 0); 132 sc->sc_sih = softint_establish(SOFTINT_SERIAL, lptsoftintr, sc); 133 134 sc->sc_dev_ok = 1; 135 } 136 137 int 138 lpt_detach_subr(device_t self, int flags) 139 { 140 struct lpt_softc *sc = device_private(self); 141 142 sc->sc_dev_ok = 0; 143 softint_disestablish(sc->sc_sih); 144 callout_destroy(&sc->sc_wakeup_ch); 145 return 0; 146 } 147 148 /* 149 * Reset the printer, then wait until it's selected and not busy. 150 */ 151 int 152 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 153 { 154 u_char flags = LPTFLAGS(dev); 155 struct lpt_softc *sc; 156 bus_space_tag_t iot; 157 bus_space_handle_t ioh; 158 u_char control; 159 int error; 160 int spin; 161 int s; 162 163 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 164 if (!sc || !sc->sc_dev_ok) 165 return ENXIO; 166 167 #if 0 /* XXX what to do? */ 168 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 169 return ENXIO; 170 #endif 171 172 #ifdef DIAGNOSTIC 173 if (sc->sc_state) 174 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 175 sc->sc_state); 176 #endif 177 178 s = spltty(); 179 180 if (sc->sc_state) { 181 error = EBUSY; 182 goto out; 183 } 184 185 sc->sc_state = LPT_INIT; 186 sc->sc_flags = flags; 187 LPRINTF(("%s: open: flags=0x%x\n", device_xname(sc->sc_dev), 188 (unsigned)flags)); 189 iot = sc->sc_iot; 190 ioh = sc->sc_ioh; 191 192 if ((flags & LPT_NOPRIME) == 0) { 193 /* assert INIT for 100 usec to start up printer */ 194 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 195 delay(100); 196 } 197 198 control = LPC_SELECT | LPC_NINIT; 199 bus_space_write_1(iot, ioh, lpt_control, control); 200 201 /* wait till ready (printer running diagnostics) */ 202 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 203 if (spin >= TIMEOUT) { 204 sc->sc_state = 0; 205 error = EBUSY; 206 goto out; 207 } 208 209 /* wait 1/4 second, give up if we get a signal */ 210 error = tsleep((void *)sc, LPTPRI | PCATCH, "lptopen", STEP); 211 if (error != EWOULDBLOCK) { 212 sc->sc_state = 0; 213 goto out; 214 } 215 } 216 217 if ((flags & LPT_NOINTR) == 0) 218 control |= LPC_IENABLE; 219 if (flags & LPT_AUTOLF) 220 control |= LPC_AUTOLF; 221 sc->sc_control = control; 222 bus_space_write_1(iot, ioh, lpt_control, control); 223 224 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 225 sc->sc_cp = NULL; 226 sc->sc_count = 0; 227 sc->sc_state = LPT_OPEN; 228 229 if ((sc->sc_flags & LPT_NOINTR) == 0) 230 lptwakeup(sc); 231 232 LPRINTF(("%s: opened\n", device_xname(sc->sc_dev))); 233 error = 0; 234 235 out: splx(s); 236 return error; 237 } 238 239 int 240 lptnotready(u_char status, struct lpt_softc *sc) 241 { 242 u_char new; 243 244 status = (status ^ LPS_INVERT) & LPS_MASK; 245 new = status & ~sc->sc_laststatus; 246 sc->sc_laststatus = status; 247 248 if (sc->sc_state & LPT_OPEN) { 249 if (new & LPS_SELECT) 250 log(LOG_NOTICE, 251 "%s: offline\n", device_xname(sc->sc_dev)); 252 else if (new & LPS_NOPAPER) 253 log(LOG_NOTICE, 254 "%s: out of paper\n", device_xname(sc->sc_dev)); 255 else if (new & LPS_NERR) 256 log(LOG_NOTICE, 257 "%s: output error\n", device_xname(sc->sc_dev)); 258 } 259 260 return status; 261 } 262 263 void 264 lptwakeup(void *arg) 265 { 266 struct lpt_softc *sc = arg; 267 int s; 268 269 s = splvm(); 270 lptintr(sc); 271 splx(s); 272 273 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 274 } 275 276 /* 277 * Close the device, and free the local line buffer. 278 */ 279 int 280 lptclose(dev_t dev, int flag, int mode, 281 struct lwp *l) 282 { 283 struct lpt_softc *sc = 284 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 285 bus_space_tag_t iot = sc->sc_iot; 286 bus_space_handle_t ioh = sc->sc_ioh; 287 int s; 288 289 s = spltty(); 290 if (sc->sc_count) 291 (void) lptpushbytes(sc); 292 sc->sc_count = 0; 293 294 if ((sc->sc_flags & LPT_NOINTR) == 0) 295 callout_stop(&sc->sc_wakeup_ch); 296 297 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 298 sc->sc_state = 0; 299 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 300 free(sc->sc_inbuf, M_DEVBUF); 301 sc->sc_cp = sc->sc_inbuf = NULL; 302 splx(s); 303 304 LPRINTF(("%s: closed\n", device_xname(sc->sc_dev))); 305 return 0; 306 } 307 308 int 309 lptpushbytes(struct lpt_softc *sc) 310 { 311 bus_space_tag_t iot = sc->sc_iot; 312 bus_space_handle_t ioh = sc->sc_ioh; 313 int error; 314 315 if (sc->sc_flags & LPT_NOINTR) { 316 int spin, tic; 317 u_char control = sc->sc_control; 318 319 while (sc->sc_count > 0) { 320 spin = 0; 321 while (NOT_READY()) { 322 if (++spin < sc->sc_spinmax) 323 continue; 324 tic = 0; 325 /* adapt busy-wait algorithm */ 326 sc->sc_spinmax++; 327 while (NOT_READY_ERR()) { 328 /* exponential backoff */ 329 tic = tic + tic + 1; 330 if (tic > TIMEOUT) 331 tic = TIMEOUT; 332 error = tsleep((void *)sc, 333 LPTPRI | PCATCH, "lptpsh", tic); 334 if (error != EWOULDBLOCK) 335 return error; 336 } 337 break; 338 } 339 340 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 341 DELAY(1); 342 bus_space_write_1(iot, ioh, lpt_control, 343 control | LPC_STROBE); 344 DELAY(1); 345 sc->sc_count--; 346 bus_space_write_1(iot, ioh, lpt_control, control); 347 DELAY(1); 348 349 /* adapt busy-wait algorithm */ 350 if (spin*2 + 16 < sc->sc_spinmax) 351 sc->sc_spinmax--; 352 } 353 } else { 354 int s; 355 356 while (sc->sc_count > 0) { 357 /* if the printer is ready for a char, give it one */ 358 if ((sc->sc_state & LPT_OBUSY) == 0) { 359 LPRINTF(("%s: write %lu\n", 360 device_xname(sc->sc_dev), 361 (u_long)sc->sc_count)); 362 s = splvm(); 363 (void) lptintr(sc); 364 splx(s); 365 } 366 error = tsleep((void *)sc, LPTPRI | PCATCH, 367 "lptwrite2", 0); 368 if (error) 369 return error; 370 } 371 } 372 return 0; 373 } 374 375 /* 376 * Copy a line from user space to a local buffer, then call putc to get the 377 * chars moved to the output queue. 378 */ 379 int 380 lptwrite(dev_t dev, struct uio *uio, int flags) 381 { 382 struct lpt_softc *sc = 383 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 384 size_t n; 385 int s; 386 bool locked = false; 387 int error = 0; 388 389 s = spltty(); 390 while (sc->sc_state & LPT_WRITING) { 391 error = tsleep(&sc->sc_state, LPTPRI | PCATCH, "lptwrite", 0); 392 if (error) 393 goto out; 394 } 395 sc->sc_state |= LPT_WRITING; 396 locked = true; 397 398 while ((n = uimin(LPT_BSIZE, uio->uio_resid)) != 0) { 399 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 400 sc->sc_count = n; 401 error = lptpushbytes(sc); 402 if (error) { 403 /* 404 * Return accurate residual if interrupted or timed 405 * out. 406 */ 407 uio->uio_resid += sc->sc_count; 408 sc->sc_count = 0; 409 goto out; 410 } 411 } 412 error = 0; 413 414 out: if (locked) { 415 sc->sc_state &= ~LPT_WRITING; 416 wakeup(&sc->sc_state); 417 } 418 splx(s); 419 return error; 420 } 421 422 /* 423 * Handle printer interrupts which occur when the printer is ready to accept 424 * another char. 425 */ 426 int 427 lptintr(void *arg) 428 { 429 struct lpt_softc *sc = arg; 430 bus_space_tag_t iot = sc->sc_iot; 431 bus_space_handle_t ioh = sc->sc_ioh; 432 433 #if 0 434 if ((sc->sc_state & LPT_OPEN) == 0) 435 return 0; 436 #endif 437 438 /* is printer online and ready for output */ 439 if (NOT_READY() && NOT_READY_ERR()) 440 return 0; 441 442 if (sc->sc_count) { 443 u_char control = sc->sc_control; 444 /* send char */ 445 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 446 DELAY(1); 447 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 448 DELAY(1); 449 sc->sc_count--; 450 bus_space_write_1(iot, ioh, lpt_control, control); 451 DELAY(1); 452 sc->sc_state |= LPT_OBUSY; 453 } else 454 sc->sc_state &= ~LPT_OBUSY; 455 456 if (sc->sc_count == 0) { 457 /* none, wake up the top half to get more */ 458 softint_schedule(sc->sc_sih); 459 } 460 461 return 1; 462 } 463 464 static void 465 lptsoftintr(void *cookie) 466 { 467 468 wakeup(cookie); 469 } 470 471 int 472 lptioctl(dev_t dev, u_long cmd, void *data, 473 int flag, struct lwp *l) 474 { 475 return ENODEV; 476 } 477
Indexes created Sun Oct 25 00:26:45 UTC 2026