Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/gpib/ppi.c
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1 /* $NetBSD: ppi.c,v 1.2 2003/08/07 16:30:56 agc Exp $ */ 2 3 /*- 4 * Copyright (c) 1996-2003 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Copyright (c) 1982, 1990, 1993 41 * The Regents of the University of California. All rights reserved. 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * @(#)ppi.c 8.1 (Berkeley) 6/16/93 68 */ 69 70 /* 71 * Printer/Plotter GPIB interface 72 */ 73 74 #include <sys/cdefs.h> 75 __KERNEL_RCSID(0, "$NetBSD: ppi.c,v 1.2 2003/08/07 16:30:56 agc Exp $"); 76 77 #include <sys/param.h> 78 #include <sys/systm.h> 79 #include <sys/callout.h> 80 #include <sys/conf.h> 81 #include <sys/device.h> 82 #include <sys/malloc.h> 83 #include <sys/proc.h> 84 #include <sys/uio.h> 85 86 #include <dev/gpib/gpibvar.h> 87 88 #include <dev/gpib/ppiio.h> 89 90 struct ppi_softc { 91 struct device sc_dev; 92 gpib_chipset_tag_t sc_ic; 93 gpib_handle_t sc_hdl; 94 95 int sc_address; /* GPIB address */ 96 int sc_flags; 97 int sc_sec; 98 struct ppiparam sc_param; 99 #define sc_burst sc_param.burst 100 #define sc_timo sc_param.timo 101 #define sc_delay sc_param.delay 102 struct callout sc_timo_ch; 103 struct callout sc_start_ch; 104 }; 105 106 /* sc_flags values */ 107 #define PPIF_ALIVE 0x01 108 #define PPIF_OPEN 0x02 109 #define PPIF_UIO 0x04 110 #define PPIF_TIMO 0x08 111 #define PPIF_DELAY 0x10 112 113 int ppimatch(struct device *, struct cfdata *, void *); 114 void ppiattach(struct device *, struct device *, void *); 115 116 CFATTACH_DECL(ppi, sizeof(struct ppi_softc), 117 ppimatch, ppiattach, NULL, NULL); 118 119 extern struct cfdriver ppi_cd; 120 121 void ppicallback(void *, int); 122 void ppistart(void *); 123 124 void ppitimo(void *); 125 int ppirw(dev_t, struct uio *); 126 int ppihztoms(int); 127 int ppimstohz(int); 128 129 dev_type_open(ppiopen); 130 dev_type_close(ppiclose); 131 dev_type_read(ppiread); 132 dev_type_write(ppiwrite); 133 dev_type_ioctl(ppiioctl); 134 135 const struct cdevsw ppi_cdevsw = { 136 ppiopen, ppiclose, ppiread, ppiwrite, ppiioctl, 137 nostop, notty, nopoll, nommap, nokqfilter, 138 }; 139 140 #define UNIT(x) minor(x) 141 142 #ifdef DEBUG 143 int ppidebug = 0x80; 144 #define PDB_FOLLOW 0x01 145 #define PDB_IO 0x02 146 #define PDB_NOCHECK 0x80 147 #define DPRINTF(mask, str) if (ppidebug & (mask)) printf str 148 #else 149 #define DPRINTF(mask, str) /* nothing */ 150 #endif 151 152 int 153 ppimatch(parent, match, aux) 154 struct device *parent; 155 struct cfdata *match; 156 void *aux; 157 { 158 159 return (1); 160 } 161 162 void 163 ppiattach(parent, self, aux) 164 struct device *parent, *self; 165 void *aux; 166 { 167 struct ppi_softc *sc = (struct ppi_softc *)self; 168 struct gpib_attach_args *ga = aux; 169 170 printf("\n"); 171 172 sc->sc_ic = ga->ga_ic; 173 sc->sc_address = ga->ga_address; 174 175 callout_init(&sc->sc_timo_ch); 176 callout_init(&sc->sc_start_ch); 177 178 if (gpibregister(sc->sc_ic, sc->sc_address, ppicallback, sc, 179 &sc->sc_hdl)) { 180 printf("%s: can't register callback\n", sc->sc_dev.dv_xname); 181 return; 182 } 183 184 sc->sc_flags = PPIF_ALIVE; 185 } 186 187 int 188 ppiopen(dev, flags, fmt, p) 189 dev_t dev; 190 int flags, fmt; 191 struct proc *p; 192 { 193 int unit = UNIT(dev); 194 struct ppi_softc *sc; 195 196 if (unit >= ppi_cd.cd_ndevs || 197 (sc = ppi_cd.cd_devs[unit]) == NULL || 198 (sc->sc_flags & PPIF_ALIVE) == 0) 199 return (ENXIO); 200 201 DPRINTF(PDB_FOLLOW, ("ppiopen(%x, %x): flags %x\n", 202 dev, flags, sc->sc_flags)); 203 204 if (sc->sc_flags & PPIF_OPEN) 205 return (EBUSY); 206 sc->sc_flags |= PPIF_OPEN; 207 sc->sc_burst = PPI_BURST; 208 sc->sc_timo = ppimstohz(PPI_TIMO); 209 sc->sc_delay = ppimstohz(PPI_DELAY); 210 sc->sc_sec = -1; 211 return (0); 212 } 213 214 int 215 ppiclose(dev, flags, fmt, p) 216 dev_t dev; 217 int flags, fmt; 218 struct proc *p; 219 { 220 int unit = UNIT(dev); 221 struct ppi_softc *sc = ppi_cd.cd_devs[unit]; 222 223 DPRINTF(PDB_FOLLOW, ("ppiclose(%x, %x): flags %x\n", 224 dev, flags, sc->sc_flags)); 225 226 sc->sc_flags &= ~PPIF_OPEN; 227 return (0); 228 } 229 230 void 231 ppicallback(v, action) 232 void *v; 233 int action; 234 { 235 struct ppi_softc *sc = v; 236 237 DPRINTF(PDB_FOLLOW, ("ppicallback: v=%p, action=%d\n", v, action)); 238 239 switch (action) { 240 case GPIBCBF_START: 241 ppistart(sc); 242 case GPIBCBF_INTR: 243 /* no-op */ 244 break; 245 #ifdef DEBUG 246 default: 247 DPRINTF(PDB_FOLLOW, ("ppicallback: unknown action %d\n", 248 action)); 249 break; 250 #endif 251 } 252 } 253 254 void 255 ppistart(v) 256 void *v; 257 { 258 struct ppi_softc *sc = v; 259 260 DPRINTF(PDB_FOLLOW, ("ppistart(%x)\n", sc->sc_dev.dv_unit)); 261 262 sc->sc_flags &= ~PPIF_DELAY; 263 wakeup(sc); 264 } 265 266 void 267 ppitimo(arg) 268 void *arg; 269 { 270 struct ppi_softc *sc = arg; 271 272 DPRINTF(PDB_FOLLOW, ("ppitimo(%x)\n", sc->sc_dev.dv_unit)); 273 274 sc->sc_flags &= ~(PPIF_UIO|PPIF_TIMO); 275 wakeup(sc); 276 } 277 278 int 279 ppiread(dev, uio, flags) 280 dev_t dev; 281 struct uio *uio; 282 int flags; 283 { 284 285 DPRINTF(PDB_FOLLOW, ("ppiread(%x, %p)\n", dev, uio)); 286 287 return (ppirw(dev, uio)); 288 } 289 290 int 291 ppiwrite(dev, uio, flags) 292 dev_t dev; 293 struct uio *uio; 294 int flags; 295 { 296 297 DPRINTF(PDB_FOLLOW, ("ppiwrite(%x, %p)\n", dev, uio)); 298 299 return (ppirw(dev, uio)); 300 } 301 302 int 303 ppirw(dev, uio) 304 dev_t dev; 305 struct uio *uio; 306 { 307 int unit = UNIT(dev); 308 struct ppi_softc *sc = ppi_cd.cd_devs[unit]; 309 int s, len, cnt; 310 char *cp; 311 int error = 0, gotdata = 0; 312 int buflen, address; 313 char *buf; 314 315 if (uio->uio_resid == 0) 316 return (0); 317 318 address = sc->sc_address; 319 320 DPRINTF(PDB_FOLLOW|PDB_IO, 321 ("ppirw(%x, %p, %c): burst %d, timo %d, resid %x\n", 322 dev, uio, uio->uio_rw == UIO_READ ? 'R' : 'W', 323 sc->sc_burst, sc->sc_timo, uio->uio_resid)); 324 325 buflen = min(sc->sc_burst, uio->uio_resid); 326 buf = (char *)malloc(buflen, M_DEVBUF, M_WAITOK); 327 sc->sc_flags |= PPIF_UIO; 328 if (sc->sc_timo > 0) { 329 sc->sc_flags |= PPIF_TIMO; 330 callout_reset(&sc->sc_timo_ch, sc->sc_timo, ppitimo, sc); 331 } 332 len = cnt = 0; 333 while (uio->uio_resid > 0) { 334 len = min(buflen, uio->uio_resid); 335 cp = buf; 336 if (uio->uio_rw == UIO_WRITE) { 337 error = uiomove(cp, len, uio); 338 if (error) 339 break; 340 } 341 again: 342 s = splbio(); 343 if (sc->sc_flags & PPIF_UIO) { 344 if (gpibrequest(sc->sc_ic, sc->sc_hdl) == 0) 345 (void) tsleep(sc, PRIBIO + 1, "ppirw", 0); 346 } 347 /* 348 * Check if we timed out during sleep or uiomove 349 */ 350 (void) spllowersoftclock(); 351 if ((sc->sc_flags & PPIF_UIO) == 0) { 352 DPRINTF(PDB_IO, 353 ("ppirw: uiomove/sleep timo, flags %x\n", 354 sc->sc_flags)); 355 if (sc->sc_flags & PPIF_TIMO) { 356 callout_stop(&sc->sc_timo_ch); 357 sc->sc_flags &= ~PPIF_TIMO; 358 } 359 splx(s); 360 break; 361 } 362 splx(s); 363 /* 364 * Perform the operation 365 */ 366 if (uio->uio_rw == UIO_WRITE) 367 cnt = gpibsend(sc->sc_ic, address, sc->sc_sec, 368 cp, len); 369 else 370 cnt = gpibrecv(sc->sc_ic, address, sc->sc_sec, 371 cp, len); 372 s = splbio(); 373 gpibrelease(sc->sc_ic, sc->sc_hdl); 374 DPRINTF(PDB_IO, ("ppirw: %s(%d, %x, %p, %d) -> %d\n", 375 uio->uio_rw == UIO_READ ? "recv" : "send", 376 address, sc->sc_sec, cp, len, cnt)); 377 splx(s); 378 if (uio->uio_rw == UIO_READ) { 379 if (cnt) { 380 error = uiomove(cp, cnt, uio); 381 if (error) 382 break; 383 gotdata++; 384 } 385 /* 386 * Didn't get anything this time, but did in the past. 387 * Consider us done. 388 */ 389 else if (gotdata) 390 break; 391 } 392 s = splsoftclock(); 393 /* 394 * Operation timeout (or non-blocking), quit now. 395 */ 396 if ((sc->sc_flags & PPIF_UIO) == 0) { 397 DPRINTF(PDB_IO, ("ppirw: timeout/done\n")); 398 splx(s); 399 break; 400 } 401 /* 402 * Implement inter-read delay 403 */ 404 if (sc->sc_delay > 0) { 405 sc->sc_flags |= PPIF_DELAY; 406 callout_reset(&sc->sc_start_ch, sc->sc_delay, 407 ppistart, sc); 408 error = tsleep(sc, (PCATCH|PZERO) + 1, "gpib", 0); 409 if (error) { 410 splx(s); 411 break; 412 } 413 } 414 splx(s); 415 /* 416 * Must not call uiomove again til we've used all data 417 * that we already grabbed. 418 */ 419 if (uio->uio_rw == UIO_WRITE && cnt != len) { 420 cp += cnt; 421 len -= cnt; 422 cnt = 0; 423 goto again; 424 } 425 } 426 s = splsoftclock(); 427 if (sc->sc_flags & PPIF_TIMO) { 428 callout_stop(&sc->sc_timo_ch); 429 sc->sc_flags &= ~PPIF_TIMO; 430 } 431 if (sc->sc_flags & PPIF_DELAY) { 432 callout_stop(&sc->sc_start_ch); 433 sc->sc_flags &= ~PPIF_DELAY; 434 } 435 splx(s); 436 /* 437 * Adjust for those chars that we uiomove'ed but never wrote 438 */ 439 if (uio->uio_rw == UIO_WRITE && cnt != len) { 440 uio->uio_resid += (len - cnt); 441 DPRINTF(PDB_IO, ("ppirw: short write, adjust by %d\n", 442 len - cnt)); 443 } 444 free(buf, M_DEVBUF); 445 DPRINTF(PDB_FOLLOW|PDB_IO, ("ppirw: return %d, resid %d\n", 446 error, uio->uio_resid)); 447 return (error); 448 } 449 450 int 451 ppiioctl(dev, cmd, data, flag, p) 452 dev_t dev; 453 u_long cmd; 454 caddr_t data; 455 int flag; 456 struct proc *p; 457 { 458 struct ppi_softc *sc = ppi_cd.cd_devs[UNIT(dev)]; 459 struct ppiparam *pp, *upp; 460 int error = 0; 461 462 switch (cmd) { 463 case PPIIOCGPARAM: 464 pp = &sc->sc_param; 465 upp = (struct ppiparam *)data; 466 upp->burst = pp->burst; 467 upp->timo = ppihztoms(pp->timo); 468 upp->delay = ppihztoms(pp->delay); 469 break; 470 case PPIIOCSPARAM: 471 pp = &sc->sc_param; 472 upp = (struct ppiparam *)data; 473 if (upp->burst < PPI_BURST_MIN || upp->burst > PPI_BURST_MAX || 474 upp->delay < PPI_DELAY_MIN || upp->delay > PPI_DELAY_MAX) 475 return (EINVAL); 476 pp->burst = upp->burst; 477 pp->timo = ppimstohz(upp->timo); 478 pp->delay = ppimstohz(upp->delay); 479 break; 480 case PPIIOCSSEC: 481 sc->sc_sec = *(int *)data; 482 break; 483 default: 484 return (EINVAL); 485 } 486 return (error); 487 } 488 489 int 490 ppihztoms(h) 491 int h; 492 { 493 extern int hz; 494 int m = h; 495 496 if (m > 0) 497 m = m * 1000 / hz; 498 return (m); 499 } 500 501 int 502 ppimstohz(m) 503 int m; 504 { 505 extern int hz; 506 int h = m; 507 508 if (h > 0) { 509 h = h * hz / 1000; 510 if (h == 0) 511 h = 1000 / hz; 512 } 513 return (h); 514 }
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