lpt.c revision 1.57.6.1
1 /* $NetBSD: lpt.c,v 1.57.6.1 2001/09/07 04:45:25 thorpej 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 = LPTFLAGS(devvp->v_rdev); 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(devvp->v_rdev)); 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 devvp->v_devcookie = sc; 156 157 sc->sc_state = LPT_INIT; 158 sc->sc_flags = flags; 159 LPRINTF(("%s: open: flags=0x%x\n", sc->sc_dev.dv_xname, 160 (unsigned)flags)); 161 iot = sc->sc_iot; 162 ioh = sc->sc_ioh; 163 164 if ((flags & LPT_NOPRIME) == 0) { 165 /* assert INIT for 100 usec to start up printer */ 166 bus_space_write_1(iot, ioh, lpt_control, LPC_SELECT); 167 delay(100); 168 } 169 170 control = LPC_SELECT | LPC_NINIT; 171 bus_space_write_1(iot, ioh, lpt_control, control); 172 173 /* wait till ready (printer running diagnostics) */ 174 for (spin = 0; NOT_READY_ERR(); spin += STEP) { 175 if (spin >= TIMEOUT) { 176 sc->sc_state = 0; 177 return EBUSY; 178 } 179 180 /* wait 1/4 second, give up if we get a signal */ 181 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, "lptopen", STEP); 182 if (error != EWOULDBLOCK) { 183 sc->sc_state = 0; 184 return error; 185 } 186 } 187 188 if ((flags & LPT_NOINTR) == 0) 189 control |= LPC_IENABLE; 190 if (flags & LPT_AUTOLF) 191 control |= LPC_AUTOLF; 192 sc->sc_control = control; 193 bus_space_write_1(iot, ioh, lpt_control, control); 194 195 sc->sc_inbuf = malloc(LPT_BSIZE, M_DEVBUF, M_WAITOK); 196 sc->sc_count = 0; 197 sc->sc_state = LPT_OPEN; 198 199 if ((sc->sc_flags & LPT_NOINTR) == 0) 200 lptwakeup(sc); 201 202 LPRINTF(("%s: opened\n", sc->sc_dev.dv_xname)); 203 return 0; 204 } 205 206 int 207 lptnotready(status, sc) 208 u_char status; 209 struct lpt_softc *sc; 210 { 211 u_char new; 212 213 status = (status ^ LPS_INVERT) & LPS_MASK; 214 new = status & ~sc->sc_laststatus; 215 sc->sc_laststatus = status; 216 217 if (sc->sc_state & LPT_OPEN) { 218 if (new & LPS_SELECT) 219 log(LOG_NOTICE, 220 "%s: offline\n", sc->sc_dev.dv_xname); 221 else if (new & LPS_NOPAPER) 222 log(LOG_NOTICE, 223 "%s: out of paper\n", sc->sc_dev.dv_xname); 224 else if (new & LPS_NERR) 225 log(LOG_NOTICE, 226 "%s: output error\n", sc->sc_dev.dv_xname); 227 } 228 229 return status; 230 } 231 232 void 233 lptwakeup(arg) 234 void *arg; 235 { 236 struct lpt_softc *sc = arg; 237 int s; 238 239 s = spllpt(); 240 lptintr(sc); 241 splx(s); 242 243 callout_reset(&sc->sc_wakeup_ch, STEP, lptwakeup, sc); 244 } 245 246 /* 247 * Close the device, and free the local line buffer. 248 */ 249 int 250 lptclose(devvp, flag, mode, p) 251 struct vnode *devvp; 252 int flag; 253 int mode; 254 struct proc *p; 255 { 256 struct lpt_softc *sc = devvp->v_devcookie; 257 bus_space_tag_t iot = sc->sc_iot; 258 bus_space_handle_t ioh = sc->sc_ioh; 259 260 if (sc->sc_count) 261 (void) lptpushbytes(sc); 262 263 if ((sc->sc_flags & LPT_NOINTR) == 0) 264 callout_stop(&sc->sc_wakeup_ch); 265 266 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 267 sc->sc_state = 0; 268 bus_space_write_1(iot, ioh, lpt_control, LPC_NINIT); 269 free(sc->sc_inbuf, M_DEVBUF); 270 271 LPRINTF(("%s: closed\n", sc->sc_dev.dv_xname)); 272 return 0; 273 } 274 275 int 276 lptpushbytes(sc) 277 struct lpt_softc *sc; 278 { 279 bus_space_tag_t iot = sc->sc_iot; 280 bus_space_handle_t ioh = sc->sc_ioh; 281 int error; 282 283 if (sc->sc_flags & LPT_NOINTR) { 284 int spin, tic; 285 u_char control = sc->sc_control; 286 287 while (sc->sc_count > 0) { 288 spin = 0; 289 while (NOT_READY()) { 290 if (++spin < sc->sc_spinmax) 291 continue; 292 tic = 0; 293 /* adapt busy-wait algorithm */ 294 sc->sc_spinmax++; 295 while (NOT_READY_ERR()) { 296 /* exponential backoff */ 297 tic = tic + tic + 1; 298 if (tic > TIMEOUT) 299 tic = TIMEOUT; 300 error = tsleep((caddr_t)sc, 301 LPTPRI | PCATCH, "lptpsh", tic); 302 if (error != EWOULDBLOCK) 303 return error; 304 } 305 break; 306 } 307 308 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 309 bus_space_write_1(iot, ioh, lpt_control, 310 control | LPC_STROBE); 311 sc->sc_count--; 312 bus_space_write_1(iot, ioh, lpt_control, control); 313 314 /* adapt busy-wait algorithm */ 315 if (spin*2 + 16 < sc->sc_spinmax) 316 sc->sc_spinmax--; 317 } 318 } else { 319 int s; 320 321 while (sc->sc_count > 0) { 322 /* if the printer is ready for a char, give it one */ 323 if ((sc->sc_state & LPT_OBUSY) == 0) { 324 LPRINTF(("%s: write %lu\n", sc->sc_dev.dv_xname, 325 (u_long)sc->sc_count)); 326 s = spllpt(); 327 (void) lptintr(sc); 328 splx(s); 329 } 330 error = tsleep((caddr_t)sc, LPTPRI | PCATCH, 331 "lptwrite2", 0); 332 if (error) 333 return error; 334 } 335 } 336 return 0; 337 } 338 339 /* 340 * Copy a line from user space to a local buffer, then call putc to get the 341 * chars moved to the output queue. 342 */ 343 int 344 lptwrite(devvp, uio, flags) 345 struct vnode *devvp; 346 struct uio *uio; 347 int flags; 348 { 349 struct lpt_softc *sc = devvp->v_devcookie; 350 size_t n; 351 int error = 0; 352 353 while ((n = min(LPT_BSIZE, uio->uio_resid)) != 0) { 354 uiomove(sc->sc_cp = sc->sc_inbuf, n, uio); 355 sc->sc_count = n; 356 error = lptpushbytes(sc); 357 if (error) { 358 /* 359 * Return accurate residual if interrupted or timed 360 * out. 361 */ 362 uio->uio_resid += sc->sc_count; 363 sc->sc_count = 0; 364 return error; 365 } 366 } 367 return 0; 368 } 369 370 /* 371 * Handle printer interrupts which occur when the printer is ready to accept 372 * another char. 373 */ 374 int 375 lptintr(arg) 376 void *arg; 377 { 378 struct lpt_softc *sc = arg; 379 bus_space_tag_t iot = sc->sc_iot; 380 bus_space_handle_t ioh = sc->sc_ioh; 381 382 #if 0 383 if ((sc->sc_state & LPT_OPEN) == 0) 384 return 0; 385 #endif 386 387 /* is printer online and ready for output */ 388 if (NOT_READY() && NOT_READY_ERR()) 389 return 0; 390 391 if (sc->sc_count) { 392 u_char control = sc->sc_control; 393 /* send char */ 394 bus_space_write_1(iot, ioh, lpt_data, *sc->sc_cp++); 395 DELAY(1); 396 bus_space_write_1(iot, ioh, lpt_control, control | LPC_STROBE); 397 DELAY(1); 398 sc->sc_count--; 399 bus_space_write_1(iot, ioh, lpt_control, control); 400 sc->sc_state |= LPT_OBUSY; 401 } else 402 sc->sc_state &= ~LPT_OBUSY; 403 404 if (sc->sc_count == 0) { 405 /* none, wake up the top half to get more */ 406 wakeup((caddr_t)sc); 407 } 408 409 return 1; 410 } 411 412 int 413 lptioctl(devvp, cmd, data, flag, p) 414 struct vnode *devvp; 415 u_long cmd; 416 caddr_t data; 417 int flag; 418 struct proc *p; 419 { 420 int error = 0; 421 422 switch (cmd) { 423 default: 424 error = ENODEV; 425 } 426 427 return error; 428 } 429
Indexes created Wed Oct 15 16:09:53 GMT 2025