lpt.c revision 1.75
1 /* $NetBSD: lpt.c,v 1.75 2008/06/10 22:53:08 cegger 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 1.75 2008/06/10 22:53:08 cegger 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(sc) 111 struct lpt_softc *sc; 112 { 113 bus_space_tag_t iot; 114 bus_space_handle_t ioh; 115 116 sc->sc_state = 0; 117 118 iot = sc->sc_iot; 119 ioh = sc->sc_ioh; 120 121 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 122 123 callout_init(&sc->sc_wakeup_ch, 0); 124 sc->sc_sih = softint_establish(SOFTINT_SERIAL, lptsoftintr, sc); 125 126 sc->sc_dev_ok = 1; 127 } 128 129 int 130 lpt_detach_subr(device_t self, int flags) 131 { 132 struct lpt_softc *sc = device_private(self); 133 134 sc->sc_dev_ok = 0; 135 softint_disestablish(sc->sc_sih); 136 callout_destroy(&sc->sc_wakeup_ch); 137 return 0; 138 } 139 140 /* 141 * Reset the printer, then wait until it's selected and not busy. 142 */ 143 int 144 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 145 { 146 u_char flags = LPTFLAGS(dev); 147 struct lpt_softc *sc; 148 bus_space_tag_t iot; 149 bus_space_handle_t ioh; 150 u_char control; 151 int error; 152 int spin; 153 154 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 155 if (!sc || !sc->sc_dev_ok) 156 return ENXIO; 157 158 #if 0 /* XXX what to do? */ 159 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 160 return ENXIO; 161 #endif 162 163 #ifdef DIAGNOSTIC 164 if (sc->sc_state) 165 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 166 sc->sc_state); 167 #endif 168 169 if (sc->sc_state) 170 return EBUSY; 171 172 sc->sc_state = LPT_INIT; 173 sc->sc_flags = flags; 174 LPRINTF(("%s: open: flags=0x%x\n", device_xname(sc->sc_dev), 175 (unsigned)flags)); 176 iot = sc->sc_iot; 177 ioh = sc->sc_ioh; 178 179 if ((flags & LPT_NOPRIME) == 0) { 180 /* assert INIT for 100 usec to start up printer */ 181 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 182 delay(100); 183 } 184 185 control = LPC_SELECT | LPC_NINIT; 186 bus_space_write_1(iot, ioh, lpt_control, control); 187 188 /* wait till ready (printer running diagnostics) */ 189 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 190 if (spin >= TIMEOUT) { 191 sc->sc_state = 0; 192 return EBUSY; 193 } 194 195 /* wait 1/4 second, give up if we get a signal */ 196 error = tsleep((void *)sc, LPTPRI | PCATCH, "lptopen", STEP); 197 if (error != EWOULDBLOCK) { 198 sc->sc_state = 0; 199 return error; 200 } 201 } 202 203 if ((flags & LPT_NOINTR) == 0) 204 control |= LPC_IENABLE; 205 if (flags & LPT_AUTOLF) 206 control |= LPC_AUTOLF; 207 sc->sc_control = control; 208 bus_space_write_1(iot, ioh, lpt_control, control); 209 210 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 211 sc->sc_count = 0; 212 sc->sc_state = LPT_OPEN; 213 214 if ((sc->sc_flags & LPT_NOINTR) == 0) 215 lptwakeup(sc); 216 217 LPRINTF(("%s: opened\n", device_xname(sc->sc_dev))); 218 return 0; 219 } 220 221 int 222 lptnotready(status, sc) 223 u_char status; 224 struct lpt_softc *sc; 225 { 226 u_char new; 227 228 status = (status ^ LPS_INVERT) & LPS_MASK; 229 new = status & ~sc->sc_laststatus; 230 sc->sc_laststatus = status; 231 232 if (sc->sc_state & LPT_OPEN) { 233 if (new & LPS_SELECT) 234 log(LOG_NOTICE, 235 "%s: offline\n", device_xname(sc->sc_dev)); 236 else if (new & LPS_NOPAPER) 237 log(LOG_NOTICE, 238 "%s: out of paper\n", device_xname(sc->sc_dev)); 239 else if (new & LPS_NERR) 240 log(LOG_NOTICE, 241 "%s: output error\n", device_xname(sc->sc_dev)); 242 } 243 244 return status; 245 } 246 247 void 248 lptwakeup(arg) 249 void *arg; 250 { 251 struct lpt_softc *sc = arg; 252 int s; 253 254 s = spllpt(); 255 lptintr(sc); 256 splx(s); 257 258 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 259 } 260 261 /* 262 * Close the device, and free the local line buffer. 263 */ 264 int 265 lptclose(dev_t dev, int flag, int mode, 266 struct lwp *l) 267 { 268 struct lpt_softc *sc = 269 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 270 bus_space_tag_t iot = sc->sc_iot; 271 bus_space_handle_t ioh = sc->sc_ioh; 272 273 if (sc->sc_count) 274 (void) lptpushbytes(sc); 275 276 if ((sc->sc_flags & LPT_NOINTR) == 0) 277 callout_stop(&sc->sc_wakeup_ch); 278 279 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 280 sc->sc_state = 0; 281 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 282 free(sc->sc_inbuf, M_DEVBUF); 283 284 LPRINTF(("%s: closed\n", device_xname(sc->sc_dev))); 285 return 0; 286 } 287 288 int 289 lptpushbytes(sc) 290 struct lpt_softc *sc; 291 { 292 bus_space_tag_t iot = sc->sc_iot; 293 bus_space_handle_t ioh = sc->sc_ioh; 294 int error; 295 296 if (sc->sc_flags & LPT_NOINTR) { 297 int spin, tic; 298 u_char control = sc->sc_control; 299 300 while (sc->sc_count > 0) { 301 spin = 0; 302 while (NOT_READY()) { 303 if (++spin < sc->sc_spinmax) 304 continue; 305 tic = 0; 306 /* adapt busy-wait algorithm */ 307 sc->sc_spinmax++; 308 while (NOT_READY_ERR()) { 309 /* exponential backoff */ 310 tic = tic + tic + 1; 311 if (tic > TIMEOUT) 312 tic = TIMEOUT; 313 error = tsleep((void *)sc, 314 LPTPRI | PCATCH, "lptpsh", tic); 315 if (error != EWOULDBLOCK) 316 return error; 317 } 318 break; 319 } 320 321 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 322 DELAY(1); 323 bus_space_write_1(iot, ioh, lpt_control, 324 control | LPC_STROBE); 325 DELAY(1); 326 sc->sc_count--; 327 bus_space_write_1(iot, ioh, lpt_control, control); 328 DELAY(1); 329 330 /* adapt busy-wait algorithm */ 331 if (spin*2 + 16 < sc->sc_spinmax) 332 sc->sc_spinmax--; 333 } 334 } else { 335 int s; 336 337 while (sc->sc_count > 0) { 338 /* if the printer is ready for a char, give it one */ 339 if ((sc->sc_state & LPT_OBUSY) == 0) { 340 LPRINTF(("%s: write %lu\n", 341 device_xname(sc->sc_dev), 342 (u_long)sc->sc_count)); 343 s = spllpt(); 344 (void) lptintr(sc); 345 splx(s); 346 } 347 error = tsleep((void *)sc, LPTPRI | PCATCH, 348 "lptwrite2", 0); 349 if (error) 350 return error; 351 } 352 } 353 return 0; 354 } 355 356 /* 357 * Copy a line from user space to a local buffer, then call putc to get the 358 * chars moved to the output queue. 359 */ 360 int 361 lptwrite(dev_t dev, struct uio *uio, int flags) 362 { 363 struct lpt_softc *sc = 364 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 365 size_t n; 366 int error = 0; 367 368 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 369 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 370 sc->sc_count = n; 371 error = lptpushbytes(sc); 372 if (error) { 373 /* 374 * Return accurate residual if interrupted or timed 375 * out. 376 */ 377 uio->uio_resid += sc->sc_count; 378 sc->sc_count = 0; 379 return error; 380 } 381 } 382 return 0; 383 } 384 385 /* 386 * Handle printer interrupts which occur when the printer is ready to accept 387 * another char. 388 */ 389 int 390 lptintr(arg) 391 void *arg; 392 { 393 struct lpt_softc *sc = arg; 394 bus_space_tag_t iot = sc->sc_iot; 395 bus_space_handle_t ioh = sc->sc_ioh; 396 397 #if 0 398 if ((sc->sc_state & LPT_OPEN) == 0) 399 return 0; 400 #endif 401 402 /* is printer online and ready for output */ 403 if (NOT_READY() && NOT_READY_ERR()) 404 return 0; 405 406 if (sc->sc_count) { 407 u_char control = sc->sc_control; 408 /* send char */ 409 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 410 DELAY(1); 411 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 412 DELAY(1); 413 sc->sc_count--; 414 bus_space_write_1(iot, ioh, lpt_control, control); 415 DELAY(1); 416 sc->sc_state |= LPT_OBUSY; 417 } else 418 sc->sc_state &= ~LPT_OBUSY; 419 420 if (sc->sc_count == 0) { 421 /* none, wake up the top half to get more */ 422 softint_schedule(sc->sc_sih); 423 } 424 425 return 1; 426 } 427 428 static void 429 lptsoftintr(void *cookie) 430 { 431 432 wakeup(cookie); 433 } 434 435 int 436 lptioctl(dev_t dev, u_long cmd, void *data, 437 int flag, struct lwp *l) 438 { 439 return ENODEV; 440 } 441
Indexes created Tue Sep 23 02:09:52 GMT 2025