| 1 | /* |
| 2 | * Copyright (c) 1982, 1986, 1989, 1993 |
| 3 | * The Regents of the University of California. All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | * |
| 33 | * $FreeBSD: src/sys/dev/nmdm/nmdm.c,v 1.5.2.1 2001/08/11 00:54:14 mp Exp $ |
| 34 | */ |
| 35 | |
| 36 | /* |
| 37 | * Pseudo-nulmodem Driver |
| 38 | */ |
| 39 | #include "opt_compat.h" |
| 40 | #include <sys/param.h> |
| 41 | #include <sys/systm.h> |
| 42 | #if defined(COMPAT_43) || defined(COMPAT_SUNOS) |
| 43 | #include <sys/ioctl_compat.h> |
| 44 | #endif |
| 45 | #include <sys/proc.h> |
| 46 | #include <sys/tty.h> |
| 47 | #include <sys/conf.h> |
| 48 | #include <sys/fcntl.h> |
| 49 | #include <sys/poll.h> |
| 50 | #include <sys/kernel.h> |
| 51 | #include <sys/vnode.h> |
| 52 | #include <sys/signalvar.h> |
| 53 | #include <sys/malloc.h> |
| 54 | |
| 55 | MALLOC_DEFINE(M_NLMDM, "nullmodem", "nullmodem data structures"); |
| 56 | |
| 57 | static void nmdmstart __P((struct tty *tp)); |
| 58 | static void nmdmstop __P((struct tty *tp, int rw)); |
| 59 | static void wakeup_other __P((struct tty *tp, int flag)); |
| 60 | static void nmdminit __P((int n)); |
| 61 | |
| 62 | static d_open_t nmdmopen; |
| 63 | static d_close_t nmdmclose; |
| 64 | static d_read_t nmdmread; |
| 65 | static d_write_t nmdmwrite; |
| 66 | static d_ioctl_t nmdmioctl; |
| 67 | |
| 68 | #define CDEV_MAJOR 18 |
| 69 | static struct cdevsw nmdm_cdevsw = { |
| 70 | /* open */ nmdmopen, |
| 71 | /* close */ nmdmclose, |
| 72 | /* read */ nmdmread, |
| 73 | /* write */ nmdmwrite, |
| 74 | /* ioctl */ nmdmioctl, |
| 75 | /* poll */ ttypoll, |
| 76 | /* mmap */ nommap, |
| 77 | /* strategy */ nostrategy, |
| 78 | /* name */ "pts", |
| 79 | /* maj */ CDEV_MAJOR, |
| 80 | /* dump */ nodump, |
| 81 | /* psize */ nopsize, |
| 82 | /* flags */ D_TTY, |
| 83 | /* bmaj */ -1 |
| 84 | }; |
| 85 | |
| 86 | #define BUFSIZ 100 /* Chunk size iomoved to/from user */ |
| 87 | |
| 88 | struct softpart { |
| 89 | struct tty nm_tty; |
| 90 | dev_t dev; |
| 91 | int modemsignals; /* bits defined in sys/ttycom.h */ |
| 92 | int gotbreak; |
| 93 | }; |
| 94 | |
| 95 | struct nm_softc { |
| 96 | int pt_flags; |
| 97 | struct softpart part1, part2; |
| 98 | struct prison *pt_prison; |
| 99 | }; |
| 100 | |
| 101 | #define PF_STOPPED 0x10 /* user told stopped */ |
| 102 | |
| 103 | static void |
| 104 | nmdm_crossover(struct nm_softc *pti, |
| 105 | struct softpart *ourpart, |
| 106 | struct softpart *otherpart); |
| 107 | |
| 108 | #define GETPARTS(tp, ourpart, otherpart) \ |
| 109 | do { \ |
| 110 | struct nm_softc *pti = tp->t_dev->si_drv1; \ |
| 111 | if (tp == &pti->part1.nm_tty) { \ |
| 112 | ourpart = &pti->part1; \ |
| 113 | otherpart = &pti->part2; \ |
| 114 | } else { \ |
| 115 | ourpart = &pti->part2; \ |
| 116 | otherpart = &pti->part1; \ |
| 117 | } \ |
| 118 | } while (0) |
| 119 | |
| 120 | /* |
| 121 | * This function creates and initializes a pair of ttys. |
| 122 | */ |
| 123 | static void |
| 124 | nmdminit(n) |
| 125 | int n; |
| 126 | { |
| 127 | dev_t dev1, dev2; |
| 128 | struct nm_softc *pt; |
| 129 | |
| 130 | /* For now we only map the lower 8 bits of the minor */ |
| 131 | if (n & ~0xff) |
| 132 | return; |
| 133 | |
| 134 | pt = malloc(sizeof(*pt), M_NLMDM, M_WAITOK); |
| 135 | bzero(pt, sizeof(*pt)); |
| 136 | pt->part1.dev = dev1 = make_dev(&nmdm_cdevsw, n+n, |
| 137 | 0, 0, 0666, "nmdm%dA", n); |
| 138 | pt->part2.dev = dev2 = make_dev(&nmdm_cdevsw, n+n+1, |
| 139 | 0, 0, 0666, "nmdm%dB", n); |
| 140 | |
| 141 | dev1->si_drv1 = dev2->si_drv1 = pt; |
| 142 | dev1->si_tty = &pt->part1.nm_tty; |
| 143 | dev2->si_tty = &pt->part2.nm_tty; |
| 144 | ttyregister(&pt->part1.nm_tty); |
| 145 | ttyregister(&pt->part2.nm_tty); |
| 146 | pt->part1.nm_tty.t_oproc = nmdmstart; |
| 147 | pt->part2.nm_tty.t_oproc = nmdmstart; |
| 148 | pt->part1.nm_tty.t_stop = nmdmstop; |
| 149 | pt->part2.nm_tty.t_dev = dev1; |
| 150 | pt->part1.nm_tty.t_dev = dev2; |
| 151 | pt->part2.nm_tty.t_stop = nmdmstop; |
| 152 | } |
| 153 | |
| 154 | /*ARGSUSED*/ |
| 155 | static int |
| 156 | nmdmopen(dev, flag, devtype, p) |
| 157 | dev_t dev; |
| 158 | int flag, devtype; |
| 159 | struct proc *p; |
| 160 | { |
| 161 | register struct tty *tp, *tp2; |
| 162 | int error; |
| 163 | int minr; |
| 164 | dev_t nextdev; |
| 165 | struct nm_softc *pti; |
| 166 | int is_b; |
| 167 | int pair; |
| 168 | struct softpart *ourpart, *otherpart; |
| 169 | |
| 170 | /* |
| 171 | * XXX: Gross hack for DEVFS: |
| 172 | * If we openned this device, ensure we have the |
| 173 | * next one too, so people can open it. |
| 174 | */ |
| 175 | minr = lminor(dev); |
| 176 | pair = minr >> 1; |
| 177 | is_b = minr & 1; |
| 178 | |
| 179 | if (pair < 127) { |
| 180 | nextdev = makedev(major(dev), (pair+pair) + 1); |
| 181 | if (!nextdev->si_drv1) { |
| 182 | nmdminit(pair + 1); |
| 183 | } |
| 184 | } |
| 185 | if (!dev->si_drv1) |
| 186 | nmdminit(pair); |
| 187 | |
| 188 | if (!dev->si_drv1) |
| 189 | return(ENXIO); |
| 190 | |
| 191 | pti = dev->si_drv1; |
| 192 | if (is_b) |
| 193 | tp = &pti->part2.nm_tty; |
| 194 | else |
| 195 | tp = &pti->part1.nm_tty; |
| 196 | GETPARTS(tp, ourpart, otherpart); |
| 197 | tp2 = &otherpart->nm_tty; |
| 198 | ourpart->modemsignals |= TIOCM_LE; |
| 199 | |
| 200 | if ((tp->t_state & TS_ISOPEN) == 0) { |
| 201 | ttychars(tp); /* Set up default chars */ |
| 202 | tp->t_iflag = TTYDEF_IFLAG; |
| 203 | tp->t_oflag = TTYDEF_OFLAG; |
| 204 | tp->t_lflag = TTYDEF_LFLAG; |
| 205 | tp->t_cflag = TTYDEF_CFLAG; |
| 206 | tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED; |
| 207 | } else if (tp->t_state & TS_XCLUDE && suser(p)) { |
| 208 | return (EBUSY); |
| 209 | } else if (pti->pt_prison != p->p_prison) { |
| 210 | return (EBUSY); |
| 211 | } |
| 212 | |
| 213 | /* |
| 214 | * If the other side is open we have carrier |
| 215 | */ |
| 216 | if (tp2->t_state & TS_ISOPEN) { |
| 217 | (void)(*linesw[tp->t_line].l_modem)(tp, 1); |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * And the other side gets carrier as we are now open. |
| 222 | */ |
| 223 | (void)(*linesw[tp2->t_line].l_modem)(tp2, 1); |
| 224 | |
| 225 | /* External processing makes no sense here */ |
| 226 | tp->t_lflag &= ~EXTPROC; |
| 227 | |
| 228 | /* |
| 229 | * Wait here if we don't have carrier. |
| 230 | */ |
| 231 | #if 0 |
| 232 | while ((tp->t_state & TS_CARR_ON) == 0) { |
| 233 | if (flag & FNONBLOCK) |
| 234 | break; |
| 235 | error = ttysleep(tp, TSA_CARR_ON(tp), TTIPRI | PCATCH, |
| 236 | "nmdopn", 0); |
| 237 | if (error) |
| 238 | return (error); |
| 239 | } |
| 240 | #endif |
| 241 | |
| 242 | /* |
| 243 | * Give the line disciplin a chance to set this end up. |
| 244 | */ |
| 245 | error = (*linesw[tp->t_line].l_open)(dev, tp); |
| 246 | |
| 247 | /* |
| 248 | * Wake up the other side. |
| 249 | * Theoretically not needed. |
| 250 | */ |
| 251 | ourpart->modemsignals |= TIOCM_DTR; |
| 252 | nmdm_crossover(pti, ourpart, otherpart); |
| 253 | if (error == 0) |
| 254 | wakeup_other(tp, FREAD|FWRITE); /* XXX */ |
| 255 | return (error); |
| 256 | } |
| 257 | |
| 258 | static int |
| 259 | nmdmclose(dev, flag, mode, p) |
| 260 | dev_t dev; |
| 261 | int flag, mode; |
| 262 | struct proc *p; |
| 263 | { |
| 264 | register struct tty *tp, *tp2; |
| 265 | int err; |
| 266 | struct softpart *ourpart, *otherpart; |
| 267 | |
| 268 | /* |
| 269 | * let the other end know that the game is up |
| 270 | */ |
| 271 | tp = dev->si_tty; |
| 272 | GETPARTS(tp, ourpart, otherpart); |
| 273 | tp2 = &otherpart->nm_tty; |
| 274 | (void)(*linesw[tp2->t_line].l_modem)(tp2, 0); |
| 275 | |
| 276 | /* |
| 277 | * XXX MDMBUF makes no sense for nmdms but would inhibit the above |
| 278 | * l_modem(). CLOCAL makes sense but isn't supported. Special |
| 279 | * l_modem()s that ignore carrier drop make no sense for nmdms but |
| 280 | * may be in use because other parts of the line discipline make |
| 281 | * sense for nmdms. Recover by doing everything that a normal |
| 282 | * ttymodem() would have done except for sending a SIGHUP. |
| 283 | */ |
| 284 | if (tp2->t_state & TS_ISOPEN) { |
| 285 | tp2->t_state &= ~(TS_CARR_ON | TS_CONNECTED); |
| 286 | tp2->t_state |= TS_ZOMBIE; |
| 287 | ttyflush(tp2, FREAD | FWRITE); |
| 288 | } |
| 289 | |
| 290 | err = (*linesw[tp->t_line].l_close)(tp, flag); |
| 291 | ourpart->modemsignals &= ~TIOCM_DTR; |
| 292 | nmdm_crossover(dev->si_drv1, ourpart, otherpart); |
| 293 | nmdmstop(tp, FREAD|FWRITE); |
| 294 | (void) ttyclose(tp); |
| 295 | return (err); |
| 296 | } |
| 297 | |
| 298 | static int |
| 299 | nmdmread(dev, uio, flag) |
| 300 | dev_t dev; |
| 301 | struct uio *uio; |
| 302 | int flag; |
| 303 | { |
| 304 | int error = 0; |
| 305 | struct tty *tp, *tp2; |
| 306 | struct softpart *ourpart, *otherpart; |
| 307 | |
| 308 | tp = dev->si_tty; |
| 309 | GETPARTS(tp, ourpart, otherpart); |
| 310 | tp2 = &otherpart->nm_tty; |
| 311 | |
| 312 | #if 0 |
| 313 | if (tp2->t_state & TS_ISOPEN) { |
| 314 | error = (*linesw[tp->t_line].l_read)(tp, uio, flag); |
| 315 | wakeup_other(tp, FWRITE); |
| 316 | } else { |
| 317 | if (flag & IO_NDELAY) { |
| 318 | return (EWOULDBLOCK); |
| 319 | } |
| 320 | error = tsleep(TSA_PTC_READ(tp), |
| 321 | TTIPRI | PCATCH, "nmdout", 0); |
| 322 | } |
| 323 | } |
| 324 | #else |
| 325 | if ((error = (*linesw[tp->t_line].l_read)(tp, uio, flag)) == 0) |
| 326 | wakeup_other(tp, FWRITE); |
| 327 | #endif |
| 328 | return (error); |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Write to pseudo-tty. |
| 333 | * Wakeups of controlling tty will happen |
| 334 | * indirectly, when tty driver calls nmdmstart. |
| 335 | */ |
| 336 | static int |
| 337 | nmdmwrite(dev, uio, flag) |
| 338 | dev_t dev; |
| 339 | struct uio *uio; |
| 340 | int flag; |
| 341 | { |
| 342 | register u_char *cp = 0; |
| 343 | register int cc = 0; |
| 344 | u_char locbuf[BUFSIZ]; |
| 345 | int cnt = 0; |
| 346 | int error = 0; |
| 347 | struct tty *tp1, *tp; |
| 348 | struct softpart *ourpart, *otherpart; |
| 349 | |
| 350 | tp1 = dev->si_tty; |
| 351 | /* |
| 352 | * Get the other tty struct. |
| 353 | * basically we are writing into the INPUT side of the other device. |
| 354 | */ |
| 355 | GETPARTS(tp1, ourpart, otherpart); |
| 356 | tp = &otherpart->nm_tty; |
| 357 | |
| 358 | again: |
| 359 | if ((tp->t_state & TS_ISOPEN) == 0) |
| 360 | return (EIO); |
| 361 | while (uio->uio_resid > 0 || cc > 0) { |
| 362 | /* |
| 363 | * Fill up the buffer if it's empty |
| 364 | */ |
| 365 | if (cc == 0) { |
| 366 | cc = min(uio->uio_resid, BUFSIZ); |
| 367 | cp = locbuf; |
| 368 | error = uiomove((caddr_t)cp, cc, uio); |
| 369 | if (error) |
| 370 | return (error); |
| 371 | /* check again for safety */ |
| 372 | if ((tp->t_state & TS_ISOPEN) == 0) { |
| 373 | /* adjust for data copied in but not written */ |
| 374 | uio->uio_resid += cc; |
| 375 | return (EIO); |
| 376 | } |
| 377 | } |
| 378 | while (cc > 0) { |
| 379 | if (((tp->t_rawq.c_cc + tp->t_canq.c_cc) >= (TTYHOG-2)) |
| 380 | && ((tp->t_canq.c_cc > 0) || !(tp->t_iflag&ICANON))) { |
| 381 | /* |
| 382 | * Come here to wait for space in outq, |
| 383 | * or space in rawq, or an empty canq. |
| 384 | */ |
| 385 | wakeup(TSA_HUP_OR_INPUT(tp)); |
| 386 | if ((tp->t_state & TS_CONNECTED) == 0) { |
| 387 | /* |
| 388 | * Data piled up because not connected. |
| 389 | * Adjust for data copied in but |
| 390 | * not written. |
| 391 | */ |
| 392 | uio->uio_resid += cc; |
| 393 | return (EIO); |
| 394 | } |
| 395 | if (flag & IO_NDELAY) { |
| 396 | /* |
| 397 | * Don't wait if asked not to. |
| 398 | * Adjust for data copied in but |
| 399 | * not written. |
| 400 | */ |
| 401 | uio->uio_resid += cc; |
| 402 | if (cnt == 0) |
| 403 | return (EWOULDBLOCK); |
| 404 | return (0); |
| 405 | } |
| 406 | error = tsleep(TSA_PTC_WRITE(tp), |
| 407 | TTOPRI | PCATCH, "nmdout", 0); |
| 408 | if (error) { |
| 409 | /* |
| 410 | * Tsleep returned (signal?). |
| 411 | * Go find out what the user wants. |
| 412 | * adjust for data copied in but |
| 413 | * not written |
| 414 | */ |
| 415 | uio->uio_resid += cc; |
| 416 | return (error); |
| 417 | } |
| 418 | goto again; |
| 419 | } |
| 420 | (*linesw[tp->t_line].l_rint)(*cp++, tp); |
| 421 | cnt++; |
| 422 | cc--; |
| 423 | } |
| 424 | cc = 0; |
| 425 | } |
| 426 | return (0); |
| 427 | } |
| 428 | |
| 429 | /* |
| 430 | * Start output on pseudo-tty. |
| 431 | * Wake up process selecting or sleeping for input from controlling tty. |
| 432 | */ |
| 433 | static void |
| 434 | nmdmstart(tp) |
| 435 | struct tty *tp; |
| 436 | { |
| 437 | register struct nm_softc *pti = tp->t_dev->si_drv1; |
| 438 | |
| 439 | if (tp->t_state & TS_TTSTOP) |
| 440 | return; |
| 441 | pti->pt_flags &= ~PF_STOPPED; |
| 442 | wakeup_other(tp, FREAD); |
| 443 | } |
| 444 | |
| 445 | /* Wakes up the OTHER tty;*/ |
| 446 | static void |
| 447 | wakeup_other(tp, flag) |
| 448 | struct tty *tp; |
| 449 | int flag; |
| 450 | { |
| 451 | struct softpart *ourpart, *otherpart; |
| 452 | |
| 453 | GETPARTS(tp, ourpart, otherpart); |
| 454 | if (flag & FREAD) { |
| 455 | selwakeup(&otherpart->nm_tty.t_rsel); |
| 456 | wakeup(TSA_PTC_READ((&otherpart->nm_tty))); |
| 457 | } |
| 458 | if (flag & FWRITE) { |
| 459 | selwakeup(&otherpart->nm_tty.t_wsel); |
| 460 | wakeup(TSA_PTC_WRITE((&otherpart->nm_tty))); |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | static void |
| 465 | nmdmstop(tp, flush) |
| 466 | register struct tty *tp; |
| 467 | int flush; |
| 468 | { |
| 469 | struct nm_softc *pti = tp->t_dev->si_drv1; |
| 470 | int flag; |
| 471 | |
| 472 | /* note: FLUSHREAD and FLUSHWRITE already ok */ |
| 473 | if (flush == 0) { |
| 474 | flush = TIOCPKT_STOP; |
| 475 | pti->pt_flags |= PF_STOPPED; |
| 476 | } else |
| 477 | pti->pt_flags &= ~PF_STOPPED; |
| 478 | /* change of perspective */ |
| 479 | flag = 0; |
| 480 | if (flush & FREAD) |
| 481 | flag |= FWRITE; |
| 482 | if (flush & FWRITE) |
| 483 | flag |= FREAD; |
| 484 | wakeup_other(tp, flag); |
| 485 | } |
| 486 | |
| 487 | /*ARGSUSED*/ |
| 488 | static int |
| 489 | nmdmioctl(dev, cmd, data, flag, p) |
| 490 | dev_t dev; |
| 491 | u_long cmd; |
| 492 | caddr_t data; |
| 493 | int flag; |
| 494 | struct proc *p; |
| 495 | { |
| 496 | register struct tty *tp = dev->si_tty; |
| 497 | struct nm_softc *pti = dev->si_drv1; |
| 498 | int error, s; |
| 499 | register struct tty *tp2; |
| 500 | struct softpart *ourpart, *otherpart; |
| 501 | |
| 502 | s = spltty(); |
| 503 | GETPARTS(tp, ourpart, otherpart); |
| 504 | tp2 = &otherpart->nm_tty; |
| 505 | |
| 506 | error = (*linesw[tp->t_line].l_ioctl)(tp, cmd, data, flag, p); |
| 507 | if (error == ENOIOCTL) |
| 508 | error = ttioctl(tp, cmd, data, flag); |
| 509 | if (error == ENOIOCTL) { |
| 510 | switch (cmd) { |
| 511 | case TIOCSBRK: |
| 512 | otherpart->gotbreak = 1; |
| 513 | break; |
| 514 | case TIOCCBRK: |
| 515 | break; |
| 516 | case TIOCSDTR: |
| 517 | ourpart->modemsignals |= TIOCM_DTR; |
| 518 | break; |
| 519 | case TIOCCDTR: |
| 520 | ourpart->modemsignals &= TIOCM_DTR; |
| 521 | break; |
| 522 | case TIOCMSET: |
| 523 | ourpart->modemsignals = *(int *)data; |
| 524 | otherpart->modemsignals = *(int *)data; |
| 525 | break; |
| 526 | case TIOCMBIS: |
| 527 | ourpart->modemsignals |= *(int *)data; |
| 528 | break; |
| 529 | case TIOCMBIC: |
| 530 | ourpart->modemsignals &= ~(*(int *)data); |
| 531 | otherpart->modemsignals &= ~(*(int *)data); |
| 532 | break; |
| 533 | case TIOCMGET: |
| 534 | *(int *)data = ourpart->modemsignals; |
| 535 | break; |
| 536 | case TIOCMSDTRWAIT: |
| 537 | break; |
| 538 | case TIOCMGDTRWAIT: |
| 539 | *(int *)data = 0; |
| 540 | break; |
| 541 | case TIOCTIMESTAMP: |
| 542 | case TIOCDCDTIMESTAMP: |
| 543 | default: |
| 544 | splx(s); |
| 545 | error = ENOTTY; |
| 546 | return (error); |
| 547 | } |
| 548 | error = 0; |
| 549 | nmdm_crossover(pti, ourpart, otherpart); |
| 550 | } |
| 551 | splx(s); |
| 552 | return (error); |
| 553 | } |
| 554 | |
| 555 | static void |
| 556 | nmdm_crossover(struct nm_softc *pti, |
| 557 | struct softpart *ourpart, |
| 558 | struct softpart *otherpart) |
| 559 | { |
| 560 | otherpart->modemsignals &= ~(TIOCM_CTS|TIOCM_CAR); |
| 561 | if (ourpart->modemsignals & TIOCM_RTS) |
| 562 | otherpart->modemsignals |= TIOCM_CTS; |
| 563 | if (ourpart->modemsignals & TIOCM_DTR) |
| 564 | otherpart->modemsignals |= TIOCM_CAR; |
| 565 | } |
| 566 | |
| 567 | |
| 568 | |
| 569 | static void nmdm_drvinit __P((void *unused)); |
| 570 | |
| 571 | static void |
| 572 | nmdm_drvinit(unused) |
| 573 | void *unused; |
| 574 | { |
| 575 | cdevsw_add(&nmdm_cdevsw); |
| 576 | /* XXX: Gross hack for DEVFS */ |
| 577 | nmdminit(0); |
| 578 | } |
| 579 | |
| 580 | SYSINIT(nmdmdev,SI_SUB_DRIVERS,SI_ORDER_MIDDLE+CDEV_MAJOR,nmdm_drvinit,NULL) |