lpt.c revision 1.72.16.3
1 /* $NetBSD: lpt.c,v 1.72.16.3 2008/04/06 09:58:50 mjf 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 1.72.16.3 2008/04/06 09:58:50 mjf Exp $"); 58 59 #include <sys/param.h> 60 #include <sys/systm.h> 61 #include <sys/proc.h> 62 #include <sys/user.h> 63 #include <sys/malloc.h> 64 #include <sys/kernel.h> 65 #include <sys/ioctl.h> 66 #include <sys/uio.h> 67 #include <sys/device.h> 68 #include <sys/conf.h> 69 #include <sys/syslog.h> 70 #include <sys/intr.h> 71 72 #include <sys/bus.h> 73 74 #include <dev/ic/lptreg.h> 75 #include <dev/ic/lptvar.h> 76 77 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 78 #define STEP hz/4 79 80 #define LPTPRI (PZERO+8) 81 #define LPT_BSIZE 1024 82 83 #define LPTDEBUG 84 85 #ifndef LPTDEBUG 86 #define LPRINTF(a) 87 #else 88 #define LPRINTF(a) if (lptdebug) printf a 89 int lptdebug = 0; 90 #endif 91 92 extern struct cfdriver lpt_cd; 93 94 dev_type_open(lptopen); 95 dev_type_close(lptclose); 96 dev_type_write(lptwrite); 97 dev_type_ioctl(lptioctl); 98 99 const struct cdevsw lpt_cdevsw = { 100 lptopen, lptclose, noread, lptwrite, lptioctl, 101 nostop, notty, nopoll, nommap, nokqfilter, D_OTHER, 102 }; 103 104 #define LPTUNIT(s) (minor(s) & 0x1f) 105 #define LPTFLAGS(s) (minor(s) & 0xe0) 106 #define LPA(unit) (unit + 128) 107 #define LPTCTL(unit) (unit + 256) 108 109 static void lptsoftintr(void *); 110 111 void 112 lpt_attach_subr(sc) 113 struct lpt_softc *sc; 114 { 115 int maj, unit; 116 bus_space_tag_t iot; 117 bus_space_handle_t ioh; 118 119 sc->sc_state = 0; 120 121 iot = sc->sc_iot; 122 ioh = sc->sc_ioh; 123 124 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 125 126 callout_init(&sc->sc_wakeup_ch, 0); 127 sc->sc_sih = softint_establish(SOFTINT_SERIAL, lptsoftintr, sc); 128 129 sc->sc_dev_ok = 1; 130 131 maj = cdevsw_lookup_major(&lpt_cdevsw); 132 unit = device_unit(sc->sc_dev); 133 134 device_register_name(makedev(maj, unit), sc->sc_dev, true, 135 DEV_OTHER, "lpt%d", unit); 136 device_register_name(makedev(maj, LPA(unit)), sc->sc_dev, true, 137 DEV_OTHER, "lpa%d", unit); 138 device_register_name(makedev(maj, LPTCTL(unit)), sc->sc_dev, true, 139 DEV_OTHER, "lpt%dctl", unit); 140 } 141 142 int 143 lpt_detach_subr(device_t self, int flags) 144 { 145 struct lpt_softc *sc = device_private(self); 146 147 device_deregister_all(self); 148 sc->sc_dev_ok = 0; 149 softint_disestablish(sc->sc_sih); 150 callout_destroy(&sc->sc_wakeup_ch); 151 return 0; 152 } 153 154 /* 155 * Reset the printer, then wait until it's selected and not busy. 156 */ 157 int 158 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 159 { 160 u_char flags = LPTFLAGS(dev); 161 struct lpt_softc *sc; 162 bus_space_tag_t iot; 163 bus_space_handle_t ioh; 164 u_char control; 165 int error; 166 int spin; 167 168 sc = device_private(device_lookup(&lpt_cd, LPTUNIT(dev))); 169 if (!sc || !sc->sc_dev_ok) 170 return ENXIO; 171 172 #if 0 /* XXX what to do? */ 173 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 174 return ENXIO; 175 #endif 176 177 #ifdef DIAGNOSTIC 178 if (sc->sc_state) 179 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 180 sc->sc_state); 181 #endif 182 183 if (sc->sc_state) 184 return EBUSY; 185 186 sc->sc_state = LPT_INIT; 187 sc->sc_flags = flags; 188 LPRINTF(("%s: open: flags=0x%x\n", device_xname(sc->sc_dev), 189 (unsigned)flags)); 190 iot = sc->sc_iot; 191 ioh = sc->sc_ioh; 192 193 if ((flags & LPT_NOPRIME) == 0) { 194 /* assert INIT for 100 usec to start up printer */ 195 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 196 delay(100); 197 } 198 199 control = LPC_SELECT | LPC_NINIT; 200 bus_space_write_1(iot, ioh, lpt_control, control); 201 202 /* wait till ready (printer running diagnostics) */ 203 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 204 if (spin >= TIMEOUT) { 205 sc->sc_state = 0; 206 return EBUSY; 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 return error; 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_count = 0; 226 sc->sc_state = LPT_OPEN; 227 228 if ((sc->sc_flags & LPT_NOINTR) == 0) 229 lptwakeup(sc); 230 231 LPRINTF(("%s: opened\n", device_xname(sc->sc_dev))); 232 return 0; 233 } 234 235 int 236 lptnotready(status, sc) 237 u_char status; 238 struct lpt_softc *sc; 239 { 240 u_char new; 241 242 status = (status ^ LPS_INVERT) & LPS_MASK; 243 new = status & ~sc->sc_laststatus; 244 sc->sc_laststatus = status; 245 246 if (sc->sc_state & LPT_OPEN) { 247 if (new & LPS_SELECT) 248 log(LOG_NOTICE, 249 "%s: offline\n", device_xname(sc->sc_dev)); 250 else if (new & LPS_NOPAPER) 251 log(LOG_NOTICE, 252 "%s: out of paper\n", device_xname(sc->sc_dev)); 253 else if (new & LPS_NERR) 254 log(LOG_NOTICE, 255 "%s: output error\n", device_xname(sc->sc_dev)); 256 } 257 258 return status; 259 } 260 261 void 262 lptwakeup(arg) 263 void *arg; 264 { 265 struct lpt_softc *sc = arg; 266 int s; 267 268 s = spllpt(); 269 lptintr(sc); 270 splx(s); 271 272 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 273 } 274 275 /* 276 * Close the device, and free the local line buffer. 277 */ 278 int 279 lptclose(dev_t dev, int flag, int mode, 280 struct lwp *l) 281 { 282 struct lpt_softc *sc = 283 device_private(device_lookup(&lpt_cd, LPTUNIT(dev))); 284 bus_space_tag_t iot = sc->sc_iot; 285 bus_space_handle_t ioh = sc->sc_ioh; 286 287 if (sc->sc_count) 288 (void) lptpushbytes(sc); 289 290 if ((sc->sc_flags & LPT_NOINTR) == 0) 291 callout_stop(&sc->sc_wakeup_ch); 292 293 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 294 sc->sc_state = 0; 295 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 296 free(sc->sc_inbuf, M_DEVBUF); 297 298 LPRINTF(("%s: closed\n", device_xname(sc->sc_dev))); 299 return 0; 300 } 301 302 int 303 lptpushbytes(sc) 304 struct lpt_softc *sc; 305 { 306 bus_space_tag_t iot = sc->sc_iot; 307 bus_space_handle_t ioh = sc->sc_ioh; 308 int error; 309 310 if (sc->sc_flags & LPT_NOINTR) { 311 int spin, tic; 312 u_char control = sc->sc_control; 313 314 while (sc->sc_count > 0) { 315 spin = 0; 316 while (NOT_READY()) { 317 if (++spin < sc->sc_spinmax) 318 continue; 319 tic = 0; 320 /* adapt busy-wait algorithm */ 321 sc->sc_spinmax++; 322 while (NOT_READY_ERR()) { 323 /* exponential backoff */ 324 tic = tic + tic + 1; 325 if (tic > TIMEOUT) 326 tic = TIMEOUT; 327 error = tsleep((void *)sc, 328 LPTPRI | PCATCH, "lptpsh", tic); 329 if (error != EWOULDBLOCK) 330 return error; 331 } 332 break; 333 } 334 335 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 336 DELAY(1); 337 bus_space_write_1(iot, ioh, lpt_control, 338 control | LPC_STROBE); 339 DELAY(1); 340 sc->sc_count--; 341 bus_space_write_1(iot, ioh, lpt_control, control); 342 DELAY(1); 343 344 /* adapt busy-wait algorithm */ 345 if (spin*2 + 16 < sc->sc_spinmax) 346 sc->sc_spinmax--; 347 } 348 } else { 349 int s; 350 351 while (sc->sc_count > 0) { 352 /* if the printer is ready for a char, give it one */ 353 if ((sc->sc_state & LPT_OBUSY) == 0) { 354 LPRINTF(("%s: write %lu\n", 355 device_xname(sc->sc_dev), 356 (u_long)sc->sc_count)); 357 s = spllpt(); 358 (void) lptintr(sc); 359 splx(s); 360 } 361 error = tsleep((void *)sc, LPTPRI | PCATCH, 362 "lptwrite2", 0); 363 if (error) 364 return error; 365 } 366 } 367 return 0; 368 } 369 370 /* 371 * Copy a line from user space to a local buffer, then call putc to get the 372 * chars moved to the output queue. 373 */ 374 int 375 lptwrite(dev_t dev, struct uio *uio, int flags) 376 { 377 struct lpt_softc *sc = 378 device_private(device_lookup(&lpt_cd, LPTUNIT(dev))); 379 size_t n; 380 int error = 0; 381 382 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 383 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 384 sc->sc_count = n; 385 error = lptpushbytes(sc); 386 if (error) { 387 /* 388 * Return accurate residual if interrupted or timed 389 * out. 390 */ 391 uio->uio_resid += sc->sc_count; 392 sc->sc_count = 0; 393 return error; 394 } 395 } 396 return 0; 397 } 398 399 /* 400 * Handle printer interrupts which occur when the printer is ready to accept 401 * another char. 402 */ 403 int 404 lptintr(arg) 405 void *arg; 406 { 407 struct lpt_softc *sc = arg; 408 bus_space_tag_t iot = sc->sc_iot; 409 bus_space_handle_t ioh = sc->sc_ioh; 410 411 #if 0 412 if ((sc->sc_state & LPT_OPEN) == 0) 413 return 0; 414 #endif 415 416 /* is printer online and ready for output */ 417 if (NOT_READY() && NOT_READY_ERR()) 418 return 0; 419 420 if (sc->sc_count) { 421 u_char control = sc->sc_control; 422 /* send char */ 423 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 424 DELAY(1); 425 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 426 DELAY(1); 427 sc->sc_count--; 428 bus_space_write_1(iot, ioh, lpt_control, control); 429 DELAY(1); 430 sc->sc_state |= LPT_OBUSY; 431 } else 432 sc->sc_state &= ~LPT_OBUSY; 433 434 if (sc->sc_count == 0) { 435 /* none, wake up the top half to get more */ 436 softint_schedule(sc->sc_sih); 437 } 438 439 return 1; 440 } 441 442 static void 443 lptsoftintr(void *cookie) 444 { 445 446 wakeup(cookie); 447 } 448 449 int 450 lptioctl(dev_t dev, u_long cmd, void *data, 451 int flag, struct lwp *l) 452 { 453 return ENODEV; 454 } 455
Indexes created Thu Oct 16 14:10:15 GMT 2025