lpt.c revision 1.78.12.1
1 /* $NetBSD: lpt.c,v 1.78.12.1 2014/05/22 11:40:22 yamt 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 1.78.12.1 2014/05/22 11:40:22 yamt 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 #define TIMEOUT hz*16 /* wait up to 16 seconds for a ready */ 77 #define STEP hz/4 78 79 #define LPTPRI (PZERO+8) 80 #define LPT_BSIZE 1024 81 82 #define LPTDEBUG 83 84 #ifndef LPTDEBUG 85 #define LPRINTF(a) 86 #else 87 #define LPRINTF(a) if (lptdebug) printf a 88 int lptdebug = 0; 89 #endif 90 91 extern struct cfdriver lpt_cd; 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_flag = D_OTHER 110 }; 111 112 #define LPTUNIT(s) (minor(s) & 0x1f) 113 #define LPTFLAGS(s) (minor(s) & 0xe0) 114 115 static void lptsoftintr(void *); 116 117 void 118 lpt_attach_subr(struct lpt_softc *sc) 119 { 120 bus_space_tag_t iot; 121 bus_space_handle_t ioh; 122 123 sc->sc_state = 0; 124 125 iot = sc->sc_iot; 126 ioh = sc->sc_ioh; 127 128 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 129 130 callout_init(&sc->sc_wakeup_ch, 0); 131 sc->sc_sih = softint_establish(SOFTINT_SERIAL, lptsoftintr, sc); 132 133 sc->sc_dev_ok = 1; 134 } 135 136 int 137 lpt_detach_subr(device_t self, int flags) 138 { 139 struct lpt_softc *sc = device_private(self); 140 141 sc->sc_dev_ok = 0; 142 softint_disestablish(sc->sc_sih); 143 callout_destroy(&sc->sc_wakeup_ch); 144 return 0; 145 } 146 147 /* 148 * Reset the printer, then wait until it's selected and not busy. 149 */ 150 int 151 lptopen(dev_t dev, int flag, int mode, struct lwp *l) 152 { 153 u_char flags = LPTFLAGS(dev); 154 struct lpt_softc *sc; 155 bus_space_tag_t iot; 156 bus_space_handle_t ioh; 157 u_char control; 158 int error; 159 int spin; 160 161 sc = device_lookup_private(&lpt_cd, LPTUNIT(dev)); 162 if (!sc || !sc->sc_dev_ok) 163 return ENXIO; 164 165 #if 0 /* XXX what to do? */ 166 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 167 return ENXIO; 168 #endif 169 170 #ifdef DIAGNOSTIC 171 if (sc->sc_state) 172 aprint_verbose_dev(sc->sc_dev, "stat=0x%x not zero\n", 173 sc->sc_state); 174 #endif 175 176 if (sc->sc_state) 177 return EBUSY; 178 179 sc->sc_state = LPT_INIT; 180 sc->sc_flags = flags; 181 LPRINTF(("%s: open: flags=0x%x\n", device_xname(sc->sc_dev), 182 (unsigned)flags)); 183 iot = sc->sc_iot; 184 ioh = sc->sc_ioh; 185 186 if ((flags & LPT_NOPRIME) == 0) { 187 /* assert INIT for 100 usec to start up printer */ 188 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 189 delay(100); 190 } 191 192 control = LPC_SELECT | LPC_NINIT; 193 bus_space_write_1(iot, ioh, lpt_control, control); 194 195 /* wait till ready (printer running diagnostics) */ 196 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 197 if (spin >= TIMEOUT) { 198 sc->sc_state = 0; 199 return EBUSY; 200 } 201 202 /* wait 1/4 second, give up if we get a signal */ 203 error = tsleep((void *)sc, LPTPRI | PCATCH, "lptopen", STEP); 204 if (error != EWOULDBLOCK) { 205 sc->sc_state = 0; 206 return error; 207 } 208 } 209 210 if ((flags & LPT_NOINTR) == 0) 211 control |= LPC_IENABLE; 212 if (flags & LPT_AUTOLF) 213 control |= LPC_AUTOLF; 214 sc->sc_control = control; 215 bus_space_write_1(iot, ioh, lpt_control, control); 216 217 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 218 sc->sc_count = 0; 219 sc->sc_state = LPT_OPEN; 220 221 if ((sc->sc_flags & LPT_NOINTR) == 0) 222 lptwakeup(sc); 223 224 LPRINTF(("%s: opened\n", device_xname(sc->sc_dev))); 225 return 0; 226 } 227 228 int 229 lptnotready(u_char status, struct lpt_softc *sc) 230 { 231 u_char new; 232 233 status = (status ^ LPS_INVERT) & LPS_MASK; 234 new = status & ~sc->sc_laststatus; 235 sc->sc_laststatus = status; 236 237 if (sc->sc_state & LPT_OPEN) { 238 if (new & LPS_SELECT) 239 log(LOG_NOTICE, 240 "%s: offline\n", device_xname(sc->sc_dev)); 241 else if (new & LPS_NOPAPER) 242 log(LOG_NOTICE, 243 "%s: out of paper\n", device_xname(sc->sc_dev)); 244 else if (new & LPS_NERR) 245 log(LOG_NOTICE, 246 "%s: output error\n", device_xname(sc->sc_dev)); 247 } 248 249 return status; 250 } 251 252 void 253 lptwakeup(void *arg) 254 { 255 struct lpt_softc *sc = arg; 256 int s; 257 258 s = splvm(); 259 lptintr(sc); 260 splx(s); 261 262 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 263 } 264 265 /* 266 * Close the device, and free the local line buffer. 267 */ 268 int 269 lptclose(dev_t dev, int flag, int mode, 270 struct lwp *l) 271 { 272 struct lpt_softc *sc = 273 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 274 bus_space_tag_t iot = sc->sc_iot; 275 bus_space_handle_t ioh = sc->sc_ioh; 276 277 if (sc->sc_count) 278 (void) lptpushbytes(sc); 279 280 if ((sc->sc_flags & LPT_NOINTR) == 0) 281 callout_stop(&sc->sc_wakeup_ch); 282 283 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 284 sc->sc_state = 0; 285 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 286 free(sc->sc_inbuf, M_DEVBUF); 287 288 LPRINTF(("%s: closed\n", device_xname(sc->sc_dev))); 289 return 0; 290 } 291 292 int 293 lptpushbytes(struct lpt_softc *sc) 294 { 295 bus_space_tag_t iot = sc->sc_iot; 296 bus_space_handle_t ioh = sc->sc_ioh; 297 int error; 298 299 if (sc->sc_flags & LPT_NOINTR) { 300 int spin, tic; 301 u_char control = sc->sc_control; 302 303 while (sc->sc_count > 0) { 304 spin = 0; 305 while (NOT_READY()) { 306 if (++spin < sc->sc_spinmax) 307 continue; 308 tic = 0; 309 /* adapt busy-wait algorithm */ 310 sc->sc_spinmax++; 311 while (NOT_READY_ERR()) { 312 /* exponential backoff */ 313 tic = tic + tic + 1; 314 if (tic > TIMEOUT) 315 tic = TIMEOUT; 316 error = tsleep((void *)sc, 317 LPTPRI | PCATCH, "lptpsh", tic); 318 if (error != EWOULDBLOCK) 319 return error; 320 } 321 break; 322 } 323 324 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 325 DELAY(1); 326 bus_space_write_1(iot, ioh, lpt_control, 327 control | LPC_STROBE); 328 DELAY(1); 329 sc->sc_count--; 330 bus_space_write_1(iot, ioh, lpt_control, control); 331 DELAY(1); 332 333 /* adapt busy-wait algorithm */ 334 if (spin*2 + 16 < sc->sc_spinmax) 335 sc->sc_spinmax--; 336 } 337 } else { 338 int s; 339 340 while (sc->sc_count > 0) { 341 /* if the printer is ready for a char, give it one */ 342 if ((sc->sc_state & LPT_OBUSY) == 0) { 343 LPRINTF(("%s: write %lu\n", 344 device_xname(sc->sc_dev), 345 (u_long)sc->sc_count)); 346 s = splvm(); 347 (void) lptintr(sc); 348 splx(s); 349 } 350 error = tsleep((void *)sc, LPTPRI | PCATCH, 351 "lptwrite2", 0); 352 if (error) 353 return error; 354 } 355 } 356 return 0; 357 } 358 359 /* 360 * Copy a line from user space to a local buffer, then call putc to get the 361 * chars moved to the output queue. 362 */ 363 int 364 lptwrite(dev_t dev, struct uio *uio, int flags) 365 { 366 struct lpt_softc *sc = 367 device_lookup_private(&lpt_cd, LPTUNIT(dev)); 368 size_t n; 369 int error = 0; 370 371 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 372 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 373 sc->sc_count = n; 374 error = lptpushbytes(sc); 375 if (error) { 376 /* 377 * Return accurate residual if interrupted or timed 378 * out. 379 */ 380 uio->uio_resid += sc->sc_count; 381 sc->sc_count = 0; 382 return error; 383 } 384 } 385 return 0; 386 } 387 388 /* 389 * Handle printer interrupts which occur when the printer is ready to accept 390 * another char. 391 */ 392 int 393 lptintr(void *arg) 394 { 395 struct lpt_softc *sc = arg; 396 bus_space_tag_t iot = sc->sc_iot; 397 bus_space_handle_t ioh = sc->sc_ioh; 398 399 #if 0 400 if ((sc->sc_state & LPT_OPEN) == 0) 401 return 0; 402 #endif 403 404 /* is printer online and ready for output */ 405 if (NOT_READY() && NOT_READY_ERR()) 406 return 0; 407 408 if (sc->sc_count) { 409 u_char control = sc->sc_control; 410 /* send char */ 411 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 412 DELAY(1); 413 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 414 DELAY(1); 415 sc->sc_count--; 416 bus_space_write_1(iot, ioh, lpt_control, control); 417 DELAY(1); 418 sc->sc_state |= LPT_OBUSY; 419 } else 420 sc->sc_state &= ~LPT_OBUSY; 421 422 if (sc->sc_count == 0) { 423 /* none, wake up the top half to get more */ 424 softint_schedule(sc->sc_sih); 425 } 426 427 return 1; 428 } 429 430 static void 431 lptsoftintr(void *cookie) 432 { 433 434 wakeup(cookie); 435 } 436 437 int 438 lptioctl(dev_t dev, u_long cmd, void *data, 439 int flag, struct lwp *l) 440 { 441 return ENODEV; 442 } 443
Indexes created Sun Oct 19 02:09:48 GMT 2025