lpt.c revision 1.58
1 /* $NetBSD: lpt.c,v 1.58 2001/11/13 13:14:40 lukem 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 1.58 2001/11/13 13:14:40 lukem 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 71 #include <machine/bus.h> 72 #include <machine/intr.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 /* XXX does not belong here */ 93 cdev_decl(lpt); 94 95 extern struct cfdriver lpt_cd; 96 97 #define LPTUNIT(s) (minor(s) & 0x1f) 98 #define LPTFLAGS(s) (minor(s) & 0xe0) 99 100 void 101 lpt_attach_subr(sc) 102 struct lpt_softc *sc; 103 { 104 bus_space_tag_t iot; 105 bus_space_handle_t ioh; 106 107 sc->sc_state = 0; 108 109 iot = sc->sc_iot; 110 ioh = sc->sc_ioh; 111 112 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 113 114 callout_init(&sc->sc_wakeup_ch); 115 116 sc->sc_dev_ok = 1; 117 } 118 119 /* 120 * Reset the printer, then wait until it's selected and not busy. 121 */ 122 int 123 lptopen(dev, flag, mode, p) 124 dev_t dev; 125 int flag; 126 int mode; 127 struct proc *p; 128 { 129 u_char flags = LPTFLAGS(dev); 130 struct lpt_softc *sc; 131 bus_space_tag_t iot; 132 bus_space_handle_t ioh; 133 u_char control; 134 int error; 135 int spin; 136 137 sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 138 if (!sc || !sc->sc_dev_ok) 139 return ENXIO; 140 141 #if 0 /* XXX what to do? */ 142 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 143 return ENXIO; 144 #endif 145 146 #ifdef DIAGNOSTIC 147 if (sc->sc_state) 148 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 149 sc->sc_state); 150 #endif 151 152 if (sc->sc_state) 153 return EBUSY; 154 155 sc->sc_state = LPT_INIT; 156 sc->sc_flags = flags; 157 LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, 158 (unsigned)flags)); 159 iot = sc->sc_iot; 160 ioh = sc->sc_ioh; 161 162 if ((flags & LPT_NOPRIME) == 0) { 163 /* assert INIT for 100 usec to start up printer */ 164 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 165 delay(100); 166 } 167 168 control = LPC_SELECT | LPC_NINIT; 169 bus_space_write_1(iot, ioh, lpt_control, control); 170 171 /* wait till ready (printer running diagnostics) */ 172 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 173 if (spin >= TIMEOUT) { 174 sc->sc_state = 0; 175 return EBUSY; 176 } 177 178 /* wait 1/4 second, give up if we get a signal */ 179 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP); 180 if (error != EWOULDBLOCK) { 181 sc->sc_state = 0; 182 return error; 183 } 184 } 185 186 if ((flags & LPT_NOINTR) == 0) 187 control |= LPC_IENABLE; 188 if (flags & LPT_AUTOLF) 189 control |= LPC_AUTOLF; 190 sc->sc_control = control; 191 bus_space_write_1(iot, ioh, lpt_control, control); 192 193 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 194 sc->sc_count = 0; 195 sc->sc_state = LPT_OPEN; 196 197 if ((sc->sc_flags & LPT_NOINTR) == 0) 198 lptwakeup(sc); 199 200 LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); 201 return 0; 202 } 203 204 int 205 lptnotready(status, sc) 206 u_char status; 207 struct lpt_softc *sc; 208 { 209 u_char new; 210 211 status = (status ^ LPS_INVERT) & LPS_MASK; 212 new = status & ~sc->sc_laststatus; 213 sc->sc_laststatus = status; 214 215 if (sc->sc_state & LPT_OPEN) { 216 if (new & LPS_SELECT) 217 log(LOG_NOTICE, 218 "%s: offline\n", sc->sc_dev.dv_xname); 219 else if (new & LPS_NOPAPER) 220 log(LOG_NOTICE, 221 "%s: out of paper\n", sc->sc_dev.dv_xname); 222 else if (new & LPS_NERR) 223 log(LOG_NOTICE, 224 "%s: output error\n", sc->sc_dev.dv_xname); 225 } 226 227 return status; 228 } 229 230 void 231 lptwakeup(arg) 232 void *arg; 233 { 234 struct lpt_softc *sc = arg; 235 int s; 236 237 s = spllpt(); 238 lptintr(sc); 239 splx(s); 240 241 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 242 } 243 244 /* 245 * Close the device, and free the local line buffer. 246 */ 247 int 248 lptclose(dev, flag, mode, p) 249 dev_t dev; 250 int flag; 251 int mode; 252 struct proc *p; 253 { 254 struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 255 bus_space_tag_t iot = sc->sc_iot; 256 bus_space_handle_t ioh = sc->sc_ioh; 257 258 if (sc->sc_count) 259 (void) lptpushbytes(sc); 260 261 if ((sc->sc_flags & LPT_NOINTR) == 0) 262 callout_stop(&sc->sc_wakeup_ch); 263 264 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 265 sc->sc_state = 0; 266 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 267 free(sc->sc_inbuf, M_DEVBUF); 268 269 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 270 return 0; 271 } 272 273 int 274 lptpushbytes(sc) 275 struct lpt_softc *sc; 276 { 277 bus_space_tag_t iot = sc->sc_iot; 278 bus_space_handle_t ioh = sc->sc_ioh; 279 int error; 280 281 if (sc->sc_flags & LPT_NOINTR) { 282 int spin, tic; 283 u_char control = sc->sc_control; 284 285 while (sc->sc_count > 0) { 286 spin = 0; 287 while (NOT_READY()) { 288 if (++spin < sc->sc_spinmax) 289 continue; 290 tic = 0; 291 /* adapt busy-wait algorithm */ 292 sc->sc_spinmax++; 293 while (NOT_READY_ERR()) { 294 /* exponential backoff */ 295 tic = tic + tic + 1; 296 if (tic > TIMEOUT) 297 tic = TIMEOUT; 298 error = tsleep((caddr_t)sc, 299 LPTPRI | PCATCH, "lptpsh", tic); 300 if (error != EWOULDBLOCK) 301 return error; 302 } 303 break; 304 } 305 306 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 307 bus_space_write_1(iot, ioh, lpt_control, 308 control | LPC_STROBE); 309 sc->sc_count--; 310 bus_space_write_1(iot, ioh, lpt_control, control); 311 312 /* adapt busy-wait algorithm */ 313 if (spin*2 + 16 < sc->sc_spinmax) 314 sc->sc_spinmax--; 315 } 316 } else { 317 int s; 318 319 while (sc->sc_count > 0) { 320 /* if the printer is ready for a char, give it one */ 321 if ((sc->sc_state & LPT_OBUSY) == 0) { 322 LPRINTF(("%s: write %lu\n", sc->sc_dev.dv_xname, 323 (u_long)sc->sc_count)); 324 s = spllpt(); 325 (void) lptintr(sc); 326 splx(s); 327 } 328 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 329 "lptwrite2", 0); 330 if (error) 331 return error; 332 } 333 } 334 return 0; 335 } 336 337 /* 338 * Copy a line from user space to a local buffer, then call putc to get the 339 * chars moved to the output queue. 340 */ 341 int 342 lptwrite(dev, uio, flags) 343 dev_t dev; 344 struct uio *uio; 345 int flags; 346 { 347 struct lpt_softc *sc = device_lookup(&lpt_cd, LPTUNIT(dev)); 348 size_t n; 349 int error = 0; 350 351 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 352 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 353 sc->sc_count = n; 354 error = lptpushbytes(sc); 355 if (error) { 356 /* 357 * Return accurate residual if interrupted or timed 358 * out. 359 */ 360 uio->uio_resid += sc->sc_count; 361 sc->sc_count = 0; 362 return error; 363 } 364 } 365 return 0; 366 } 367 368 /* 369 * Handle printer interrupts which occur when the printer is ready to accept 370 * another char. 371 */ 372 int 373 lptintr(arg) 374 void *arg; 375 { 376 struct lpt_softc *sc = arg; 377 bus_space_tag_t iot = sc->sc_iot; 378 bus_space_handle_t ioh = sc->sc_ioh; 379 380 #if 0 381 if ((sc->sc_state & LPT_OPEN) == 0) 382 return 0; 383 #endif 384 385 /* is printer online and ready for output */ 386 if (NOT_READY() && NOT_READY_ERR()) 387 return 0; 388 389 if (sc->sc_count) { 390 u_char control = sc->sc_control; 391 /* send char */ 392 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 393 DELAY(1); 394 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 395 DELAY(1); 396 sc->sc_count--; 397 bus_space_write_1(iot, ioh, lpt_control, control); 398 sc->sc_state |= LPT_OBUSY; 399 } else 400 sc->sc_state &= ~LPT_OBUSY; 401 402 if (sc->sc_count == 0) { 403 /* none, wake up the top half to get more */ 404 wakeup((caddr_t)sc); 405 } 406 407 return 1; 408 } 409 410 int 411 lptioctl(dev, cmd, data, flag, p) 412 dev_t dev; 413 u_long cmd; 414 caddr_t data; 415 int flag; 416 struct proc *p; 417 { 418 int error = 0; 419 420 switch (cmd) { 421 default: 422 error = ENODEV; 423 } 424 425 return error; 426 } 427
Indexes created Tue Sep 23 07:09:52 GMT 2025