lpt.c revision 1.76
1 /* $NetBSD: lpt.c,v 1.76 2009/03/14 15:36:17 dsl 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 1.76 2009/03/14 15:36:17 dsl 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) 106 107 static void lptsoftintr(void *); 108 109 void 110 lpt_attach_subr(struct lpt_softc *sc) 111 { 112 bus_space_tag_t iot; 113 bus_space_handle_t ioh; 114 115 sc->sc_state = 0; 116 117 iot = sc->sc_iot; 118 ioh = sc->sc_ioh; 119 120 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 121 122 callout_init(&sc->sc_wakeup_ch, 0); 123 sc->sc_sih = softint_establish(SOFTINT_SERIAL, lptsoftintr, sc); 124 125 sc->sc_dev_ok = 1; 126 } 127 128 int 129 lpt_detach_subr(device_t self, int flags) 130 { 131 struct lpt_softc *sc = device_private(self); 132 133 sc->sc_dev_ok = 0; 134 softint_disestablish(sc->sc_sih); 135 callout_destroy(&sc->sc_wakeup_ch); 136 return 0; 137 } 138 139 /* 140 * Reset the printer, then wait until it's selected and not busy. 141 */ 142 int 143 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 144 { 145 u_char flags = LPTFLAGS(dev); 146 struct lpt_softc *sc; 147 bus_space_tag_t iot; 148 bus_space_handle_t ioh; 149 u_char control; 150 int error; 151 int spin; 152 153 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 154 if (!sc || !sc->sc_dev_ok) 155 return ENXIO; 156 157 #if 0 /* XXX what to do? */ 158 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 159 return ENXIO; 160 #endif 161 162 #ifdef DIAGNOSTIC 163 if (sc->sc_state) 164 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 165 sc->sc_state); 166 #endif 167 168 if (sc->sc_state) 169 return EBUSY; 170 171 sc->sc_state = LPT_INIT; 172 sc->sc_flags = flags; 173 LPRINTF(("%s: open: flags=0x%x\n", device_xname(sc->sc_dev), 174 (unsigned)flags)); 175 iot = sc->sc_iot; 176 ioh = sc->sc_ioh; 177 178 if ((flags & LPT_NOPRIME) == 0) { 179 /* assert INIT for 100 usec to start up printer */ 180 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 181 delay(100); 182 } 183 184 control = LPC_SELECT | LPC_NINIT; 185 bus_space_write_1(iot, ioh, lpt_control, control); 186 187 /* wait till ready (printer running diagnostics) */ 188 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 189 if (spin >= TIMEOUT) { 190 sc->sc_state = 0; 191 return EBUSY; 192 } 193 194 /* wait 1/4 second, give up if we get a signal */ 195 error = tsleep((void *)sc, LPTPRI | PCATCH, "lptopen", STEP); 196 if (error != EWOULDBLOCK) { 197 sc->sc_state = 0; 198 return error; 199 } 200 } 201 202 if ((flags & LPT_NOINTR) == 0) 203 control |= LPC_IENABLE; 204 if (flags & LPT_AUTOLF) 205 control |= LPC_AUTOLF; 206 sc->sc_control = control; 207 bus_space_write_1(iot, ioh, lpt_control, control); 208 209 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 210 sc->sc_count = 0; 211 sc->sc_state = LPT_OPEN; 212 213 if ((sc->sc_flags & LPT_NOINTR) == 0) 214 lptwakeup(sc); 215 216 LPRINTF(("%s: opened\n", device_xname(sc->sc_dev))); 217 return 0; 218 } 219 220 int 221 lptnotready(u_char status, struct lpt_softc *sc) 222 { 223 u_char new; 224 225 status = (status ^ LPS_INVERT) & LPS_MASK; 226 new = status & ~sc->sc_laststatus; 227 sc->sc_laststatus = status; 228 229 if (sc->sc_state & LPT_OPEN) { 230 if (new & LPS_SELECT) 231 log(LOG_NOTICE, 232 "%s: offline\n", device_xname(sc->sc_dev)); 233 else if (new & LPS_NOPAPER) 234 log(LOG_NOTICE, 235 "%s: out of paper\n", device_xname(sc->sc_dev)); 236 else if (new & LPS_NERR) 237 log(LOG_NOTICE, 238 "%s: output error\n", device_xname(sc->sc_dev)); 239 } 240 241 return status; 242 } 243 244 void 245 lptwakeup(void *arg) 246 { 247 struct lpt_softc *sc = arg; 248 int s; 249 250 s = spllpt(); 251 lptintr(sc); 252 splx(s); 253 254 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 255 } 256 257 /* 258 * Close the device, and free the local line buffer. 259 */ 260 int 261 lptclose(dev_t dev, int flag, int mode, 262 struct lwp *l) 263 { 264 struct lpt_softc *sc = 265 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 266 bus_space_tag_t iot = sc->sc_iot; 267 bus_space_handle_t ioh = sc->sc_ioh; 268 269 if (sc->sc_count) 270 (void) lptpushbytes(sc); 271 272 if ((sc->sc_flags & LPT_NOINTR) == 0) 273 callout_stop(&sc->sc_wakeup_ch); 274 275 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 276 sc->sc_state = 0; 277 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 278 free(sc->sc_inbuf, M_DEVBUF); 279 280 LPRINTF(("%s: closed\n", device_xname(sc->sc_dev))); 281 return 0; 282 } 283 284 int 285 lptpushbytes(struct lpt_softc *sc) 286 { 287 bus_space_tag_t iot = sc->sc_iot; 288 bus_space_handle_t ioh = sc->sc_ioh; 289 int error; 290 291 if (sc->sc_flags & LPT_NOINTR) { 292 int spin, tic; 293 u_char control = sc->sc_control; 294 295 while (sc->sc_count > 0) { 296 spin = 0; 297 while (NOT_READY()) { 298 if (++spin < sc->sc_spinmax) 299 continue; 300 tic = 0; 301 /* adapt busy-wait algorithm */ 302 sc->sc_spinmax++; 303 while (NOT_READY_ERR()) { 304 /* exponential backoff */ 305 tic = tic + tic + 1; 306 if (tic > TIMEOUT) 307 tic = TIMEOUT; 308 error = tsleep((void *)sc, 309 LPTPRI | PCATCH, "lptpsh", tic); 310 if (error != EWOULDBLOCK) 311 return error; 312 } 313 break; 314 } 315 316 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 317 DELAY(1); 318 bus_space_write_1(iot, ioh, lpt_control, 319 control | LPC_STROBE); 320 DELAY(1); 321 sc->sc_count--; 322 bus_space_write_1(iot, ioh, lpt_control, control); 323 DELAY(1); 324 325 /* adapt busy-wait algorithm */ 326 if (spin*2 + 16 < sc->sc_spinmax) 327 sc->sc_spinmax--; 328 } 329 } else { 330 int s; 331 332 while (sc->sc_count > 0) { 333 /* if the printer is ready for a char, give it one */ 334 if ((sc->sc_state & LPT_OBUSY) == 0) { 335 LPRINTF(("%s: write %lu\n", 336 device_xname(sc->sc_dev), 337 (u_long)sc->sc_count)); 338 s = spllpt(); 339 (void) lptintr(sc); 340 splx(s); 341 } 342 error = tsleep((void *)sc, LPTPRI | PCATCH, 343 "lptwrite2", 0); 344 if (error) 345 return error; 346 } 347 } 348 return 0; 349 } 350 351 /* 352 * Copy a line from user space to a local buffer, then call putc to get the 353 * chars moved to the output queue. 354 */ 355 int 356 lptwrite(dev_t dev, struct uio *uio, int flags) 357 { 358 struct lpt_softc *sc = 359 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 360 size_t n; 361 int error = 0; 362 363 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 364 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 365 sc->sc_count = n; 366 error = lptpushbytes(sc); 367 if (error) { 368 /* 369 * Return accurate residual if interrupted or timed 370 * out. 371 */ 372 uio->uio_resid += sc->sc_count; 373 sc->sc_count = 0; 374 return error; 375 } 376 } 377 return 0; 378 } 379 380 /* 381 * Handle printer interrupts which occur when the printer is ready to accept 382 * another char. 383 */ 384 int 385 lptintr(void *arg) 386 { 387 struct lpt_softc *sc = arg; 388 bus_space_tag_t iot = sc->sc_iot; 389 bus_space_handle_t ioh = sc->sc_ioh; 390 391 #if 0 392 if ((sc->sc_state & LPT_OPEN) == 0) 393 return 0; 394 #endif 395 396 /* is printer online and ready for output */ 397 if (NOT_READY() && NOT_READY_ERR()) 398 return 0; 399 400 if (sc->sc_count) { 401 u_char control = sc->sc_control; 402 /* send char */ 403 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 404 DELAY(1); 405 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 406 DELAY(1); 407 sc->sc_count--; 408 bus_space_write_1(iot, ioh, lpt_control, control); 409 DELAY(1); 410 sc->sc_state |= LPT_OBUSY; 411 } else 412 sc->sc_state &= ~LPT_OBUSY; 413 414 if (sc->sc_count == 0) { 415 /* none, wake up the top half to get more */ 416 softint_schedule(sc->sc_sih); 417 } 418 419 return 1; 420 } 421 422 static void 423 lptsoftintr(void *cookie) 424 { 425 426 wakeup(cookie); 427 } 428 429 int 430 lptioctl(dev_t dev, u_long cmd, void *data, 431 int flag, struct lwp *l) 432 { 433 return ENODEV; 434 } 435
Indexes created Tue Sep 23 14:10:03 GMT 2025