lpt.c revision 1.57.6.2
1 /* $NetBSD: lpt.c,v 1.57.6.2 2001/09/26 15:28:12 fvdl 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/param.h> 57 #include <sys/systm.h> 58 #include <sys/proc.h> 59 #include <sys/user.h> 60 #include <sys/malloc.h> 61 #include <sys/kernel.h> 62 #include <sys/ioctl.h> 63 #include <sys/uio.h> 64 #include <sys/device.h> 65 #include <sys/conf.h> 66 #include <sys/syslog.h> 67 #include <sys/vnode.h> 68 69 #include <miscfs/specfs/specdev.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(devvp, flag, mode, p) 124 struct vnode *devvp; 125 int flag; 126 int mode; 127 struct proc *p; 128 { 129 u_char flags; 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 dev_t rdev; 137 138 rdev = vdev_rdev(devvp); 139 sc = device_lookup(&lpt_cd, LPTUNIT(rdev)); 140 if (!sc || !sc->sc_dev_ok) 141 return ENXIO; 142 143 flags = LPTFLAGS(rdev); 144 145 #if 0 /* XXX what to do? */ 146 if (sc->sc_irq == IRQUNK && (flags & LPT_NOINTR) == 0) 147 return ENXIO; 148 #endif 149 150 #ifdef DIAGNOSTIC 151 if (sc->sc_state) 152 printf("%s: stat=0x%x not zero\n", sc->sc_dev.dv_xname, 153 sc->sc_state); 154 #endif 155 156 if (sc->sc_state) 157 return EBUSY; 158 159 vdev_setprivdata(devvp, sc); 160 161 sc->sc_state = LPT_INIT; 162 sc->sc_flags = flags; 163 LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, 164 (unsigned)flags)); 165 iot = sc->sc_iot; 166 ioh = sc->sc_ioh; 167 168 if ((flags & LPT_NOPRIME) == 0) { 169 /* assert INIT for 100 usec to start up printer */ 170 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 171 delay(100); 172 } 173 174 control = LPC_SELECT | LPC_NINIT; 175 bus_space_write_1(iot, ioh, lpt_control, control); 176 177 /* wait till ready (printer running diagnostics) */ 178 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 179 if (spin >= TIMEOUT) { 180 sc->sc_state = 0; 181 return EBUSY; 182 } 183 184 /* wait 1/4 second, give up if we get a signal */ 185 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP); 186 if (error != EWOULDBLOCK) { 187 sc->sc_state = 0; 188 return error; 189 } 190 } 191 192 if ((flags & LPT_NOINTR) == 0) 193 control |= LPC_IENABLE; 194 if (flags & LPT_AUTOLF) 195 control |= LPC_AUTOLF; 196 sc->sc_control = control; 197 bus_space_write_1(iot, ioh, lpt_control, control); 198 199 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 200 sc->sc_count = 0; 201 sc->sc_state = LPT_OPEN; 202 203 if ((sc->sc_flags & LPT_NOINTR) == 0) 204 lptwakeup(sc); 205 206 LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); 207 return 0; 208 } 209 210 int 211 lptnotready(status, sc) 212 u_char status; 213 struct lpt_softc *sc; 214 { 215 u_char new; 216 217 status = (status ^ LPS_INVERT) & LPS_MASK; 218 new = status & ~sc->sc_laststatus; 219 sc->sc_laststatus = status; 220 221 if (sc->sc_state & LPT_OPEN) { 222 if (new & LPS_SELECT) 223 log(LOG_NOTICE, 224 "%s: offline\n", sc->sc_dev.dv_xname); 225 else if (new & LPS_NOPAPER) 226 log(LOG_NOTICE, 227 "%s: out of paper\n", sc->sc_dev.dv_xname); 228 else if (new & LPS_NERR) 229 log(LOG_NOTICE, 230 "%s: output error\n", sc->sc_dev.dv_xname); 231 } 232 233 return status; 234 } 235 236 void 237 lptwakeup(arg) 238 void *arg; 239 { 240 struct lpt_softc *sc = arg; 241 int s; 242 243 s = spllpt(); 244 lptintr(sc); 245 splx(s); 246 247 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 248 } 249 250 /* 251 * Close the device, and free the local line buffer. 252 */ 253 int 254 lptclose(devvp, flag, mode, p) 255 struct vnode *devvp; 256 int flag; 257 int mode; 258 struct proc *p; 259 { 260 struct lpt_softc *sc; 261 bus_space_tag_t iot; 262 bus_space_handle_t ioh; 263 264 sc = vdev_privdata(devvp); 265 iot = sc->sc_iot; 266 ioh = sc->sc_ioh; 267 268 if (sc->sc_count) 269 (void) lptpushbytes(sc); 270 271 if ((sc->sc_flags & LPT_NOINTR) == 0) 272 callout_stop(&sc->sc_wakeup_ch); 273 274 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 275 sc->sc_state = 0; 276 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 277 free(sc->sc_inbuf, M_DEVBUF); 278 279 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 280 return 0; 281 } 282 283 int 284 lptpushbytes(sc) 285 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((caddr_t)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 bus_space_write_1(iot, ioh, lpt_control, 318 control | LPC_STROBE); 319 sc->sc_count--; 320 bus_space_write_1(iot, ioh, lpt_control, control); 321 322 /* adapt busy-wait algorithm */ 323 if (spin*2 + 16 < sc->sc_spinmax) 324 sc->sc_spinmax--; 325 } 326 } else { 327 int s; 328 329 while (sc->sc_count > 0) { 330 /* if the printer is ready for a char, give it one */ 331 if ((sc->sc_state & LPT_OBUSY) == 0) { 332 LPRINTF(("%s: write %lu\n", sc->sc_dev.dv_xname, 333 (u_long)sc->sc_count)); 334 s = spllpt(); 335 (void) lptintr(sc); 336 splx(s); 337 } 338 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 339 "lptwrite2", 0); 340 if (error) 341 return error; 342 } 343 } 344 return 0; 345 } 346 347 /* 348 * Copy a line from user space to a local buffer, then call putc to get the 349 * chars moved to the output queue. 350 */ 351 int 352 lptwrite(devvp, uio, flags) 353 struct vnode *devvp; 354 struct uio *uio; 355 int flags; 356 { 357 struct lpt_softc *sc; 358 size_t n; 359 int error = 0; 360 361 sc = vdev_privdata(devvp); 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(arg) 386 void *arg; 387 { 388 struct lpt_softc *sc = arg; 389 bus_space_tag_t iot = sc->sc_iot; 390 bus_space_handle_t ioh = sc->sc_ioh; 391 392 #if 0 393 if ((sc->sc_state & LPT_OPEN) == 0) 394 return 0; 395 #endif 396 397 /* is printer online and ready for output */ 398 if (NOT_READY() && NOT_READY_ERR()) 399 return 0; 400 401 if (sc->sc_count) { 402 u_char control = sc->sc_control; 403 /* send char */ 404 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 405 DELAY(1); 406 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 407 DELAY(1); 408 sc->sc_count--; 409 bus_space_write_1(iot, ioh, lpt_control, control); 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 wakeup((caddr_t)sc); 417 } 418 419 return 1; 420 } 421 422 int 423 lptioctl(devvp, cmd, data, flag, p) 424 struct vnode *devvp; 425 u_long cmd; 426 caddr_t data; 427 int flag; 428 struct proc *p; 429 { 430 int error = 0; 431 432 switch (cmd) { 433 default: 434 error = ENODEV; 435 } 436 437 return error; 438 } 439
Indexes created Wed Oct 15 16:09:53 GMT 2025