pad.c revision 1.73
1 /* $NetBSD: pad.c,v 1.73 2021/06/14 18:44:37 riastradh Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 Jared D. McNeill <jmcneill (at) invisible.ca> 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 17 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 18 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 19 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 20 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __KERNEL_RCSID(0, "$NetBSD: pad.c,v 1.73 2021/06/14 18:44:37 riastradh Exp $"); 31 32 #include <sys/param.h> 33 #include <sys/types.h> 34 35 #include <sys/audioio.h> 36 #include <sys/buf.h> 37 #include <sys/condvar.h> 38 #include <sys/conf.h> 39 #include <sys/device.h> 40 #include <sys/file.h> 41 #include <sys/filedesc.h> 42 #include <sys/kauth.h> 43 #include <sys/kernel.h> 44 #include <sys/kmem.h> 45 #include <sys/module.h> 46 #include <sys/poll.h> 47 #include <sys/proc.h> 48 #include <sys/select.h> 49 #include <sys/stat.h> 50 #include <sys/vnode.h> 51 52 #include <dev/audio/audio_if.h> 53 #include <dev/audio/audiovar.h> 54 55 #include <dev/pad/padvar.h> 56 57 #include "ioconf.h" 58 59 /* #define PAD_DEBUG */ 60 #ifdef PAD_DEBUG 61 #define DPRINTF(fmt...) printf(fmt) 62 #else 63 #define DPRINTF(fmt...) /**/ 64 #endif 65 66 #define PADFREQ 44100 67 #define PADCHAN 2 68 #define PADPREC 16 69 70 typedef struct pad_block { 71 uint8_t *pb_ptr; 72 int pb_len; 73 } pad_block_t; 74 75 enum { 76 PAD_OUTPUT_CLASS, 77 PAD_INPUT_CLASS, 78 PAD_OUTPUT_MASTER_VOLUME, 79 PAD_INPUT_DAC_VOLUME, 80 PAD_ENUM_LAST, 81 }; 82 83 static int pad_match(device_t, cfdata_t, void *); 84 static void pad_attach(device_t, device_t, void *); 85 static int pad_detach(device_t, int); 86 static void pad_childdet(device_t, device_t); 87 88 static int pad_query_format(void *, audio_format_query_t *); 89 static int pad_set_format(void *, int, 90 const audio_params_t *, const audio_params_t *, 91 audio_filter_reg_t *, audio_filter_reg_t *); 92 static int pad_start_output(void *, void *, int, 93 void (*)(void *), void *); 94 static int pad_halt_output(void *); 95 static int pad_getdev(void *, struct audio_device *); 96 static int pad_set_port(void *, mixer_ctrl_t *); 97 static int pad_get_port(void *, mixer_ctrl_t *); 98 static int pad_query_devinfo(void *, mixer_devinfo_t *); 99 static int pad_get_props(void *); 100 static void pad_get_locks(void *, kmutex_t **, kmutex_t **); 101 102 static void pad_done_output(void *); 103 static void pad_swvol_codec(audio_filter_arg_t *); 104 105 static void pad_close(struct pad_softc *); 106 static int pad_read(struct pad_softc *, off_t *, struct uio *, 107 kauth_cred_t, int); 108 109 static int fops_pad_close(struct file *); 110 static int fops_pad_read(struct file *, off_t *, struct uio *, 111 kauth_cred_t, int); 112 static int fops_pad_write(struct file *, off_t *, struct uio *, 113 kauth_cred_t, int); 114 static int fops_pad_ioctl(struct file *, u_long, void *); 115 static int fops_pad_kqfilter(struct file *, struct knote *); 116 static int fops_pad_poll(struct file *, int); 117 static int fops_pad_stat(struct file *, struct stat *); 118 static int fops_pad_mmap(struct file *, off_t *, size_t, int, int *, int *, 119 struct uvm_object **, int *); 120 121 static const struct audio_hw_if pad_hw_if = { 122 .query_format = pad_query_format, 123 .set_format = pad_set_format, 124 .start_output = pad_start_output, 125 .halt_output = pad_halt_output, 126 .getdev = pad_getdev, 127 .set_port = pad_set_port, 128 .get_port = pad_get_port, 129 .query_devinfo = pad_query_devinfo, 130 .get_props = pad_get_props, 131 .get_locks = pad_get_locks, 132 }; 133 134 #define PAD_NFORMATS 1 135 static const struct audio_format pad_formats[PAD_NFORMATS] = { 136 { 137 .mode = AUMODE_PLAY, 138 .encoding = AUDIO_ENCODING_SLINEAR_LE, 139 .validbits = PADPREC, 140 .precision = PADPREC, 141 .channels = PADCHAN, 142 .channel_mask = AUFMT_STEREO, 143 .frequency_type = 1, 144 .frequency = { PADFREQ }, 145 }, 146 }; 147 148 extern void padattach(int); 149 150 static int pad_add_block(struct pad_softc *, uint8_t *, int); 151 static int pad_get_block(struct pad_softc *, pad_block_t *, int); 152 153 static dev_type_open(pad_open); 154 155 const struct cdevsw pad_cdevsw = { 156 .d_open = pad_open, 157 .d_close = noclose, 158 .d_read = noread, 159 .d_write = nowrite, 160 .d_ioctl = noioctl, 161 .d_stop = nostop, 162 .d_tty = notty, 163 .d_poll = nopoll, 164 .d_mmap = nommap, 165 .d_kqfilter = nokqfilter, 166 .d_discard = nodiscard, 167 .d_flag = D_OTHER | D_MPSAFE, 168 }; 169 170 const struct fileops pad_fileops = { 171 .fo_name = "pad", 172 .fo_read = fops_pad_read, 173 .fo_write = fops_pad_write, 174 .fo_ioctl = fops_pad_ioctl, 175 .fo_fcntl = fnullop_fcntl, 176 .fo_stat = fops_pad_stat, 177 .fo_poll = fops_pad_poll, 178 .fo_close = fops_pad_close, 179 .fo_mmap = fops_pad_mmap, 180 .fo_kqfilter = fops_pad_kqfilter, 181 .fo_restart = fnullop_restart 182 }; 183 184 CFATTACH_DECL2_NEW(pad, sizeof(struct pad_softc), 185 pad_match, pad_attach, pad_detach, 186 NULL, NULL, pad_childdet); 187 188 void 189 padattach(int n) 190 { 191 int error; 192 193 error = config_cfattach_attach(pad_cd.cd_name, &pad_ca); 194 if (error) { 195 aprint_error("%s: couldn't register cfattach: %d\n", 196 pad_cd.cd_name, error); 197 config_cfdriver_detach(&pad_cd); 198 return; 199 } 200 } 201 202 static int 203 pad_match(device_t parent, cfdata_t data, void *opaque) 204 { 205 206 return 1; 207 } 208 209 static void 210 pad_attach(device_t parent, device_t self, void *opaque) 211 { 212 struct pad_softc *sc = device_private(self); 213 214 KASSERT(KERNEL_LOCKED_P()); 215 216 aprint_normal_dev(self, "outputs: 44100Hz, 16-bit, stereo\n"); 217 218 sc->sc_dev = self; 219 220 cv_init(&sc->sc_condvar, device_xname(sc->sc_dev)); 221 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 222 mutex_init(&sc->sc_intr_lock, MUTEX_DEFAULT, IPL_SOFTCLOCK); 223 callout_init(&sc->sc_pcallout, CALLOUT_MPSAFE); 224 callout_setfunc(&sc->sc_pcallout, pad_done_output, sc); 225 226 sc->sc_swvol = 255; 227 sc->sc_buflen = 0; 228 sc->sc_rpos = sc->sc_wpos = 0; 229 sc->sc_audiodev = audio_attach_mi(&pad_hw_if, sc, sc->sc_dev); 230 231 if (!pmf_device_register(sc->sc_dev, NULL, NULL)) 232 aprint_error_dev(sc->sc_dev, 233 "couldn't establish power handler\n"); 234 235 sc->sc_open = 1; 236 } 237 238 static int 239 pad_detach(device_t self, int flags) 240 { 241 struct pad_softc *sc = device_private(self); 242 int cmaj, mn; 243 int error; 244 245 KASSERT(KERNEL_LOCKED_P()); 246 247 /* Prevent detach without going through close -- e.g., drvctl. */ 248 if (sc->sc_open) 249 return EBUSY; 250 251 error = config_detach_children(self, flags); 252 if (error) 253 return error; 254 255 cmaj = cdevsw_lookup_major(&pad_cdevsw); 256 mn = device_unit(sc->sc_dev); 257 vdevgone(cmaj, mn, mn, VCHR); 258 259 pmf_device_deregister(sc->sc_dev); 260 261 callout_destroy(&sc->sc_pcallout); 262 mutex_destroy(&sc->sc_lock); 263 mutex_destroy(&sc->sc_intr_lock); 264 cv_destroy(&sc->sc_condvar); 265 266 return 0; 267 } 268 269 static void 270 pad_childdet(device_t self, device_t child) 271 { 272 struct pad_softc *sc = device_private(self); 273 274 KASSERT(KERNEL_LOCKED_P()); 275 276 if (child == sc->sc_audiodev) 277 sc->sc_audiodev = NULL; 278 } 279 280 static int 281 pad_add_block(struct pad_softc *sc, uint8_t *blk, int blksize) 282 { 283 int l; 284 285 KASSERT(blksize >= 0); 286 KASSERT(mutex_owned(&sc->sc_intr_lock)); 287 288 if (blksize > PAD_BUFSIZE || 289 sc->sc_buflen > PAD_BUFSIZE - (unsigned)blksize) 290 return ENOBUFS; 291 292 if (sc->sc_wpos + blksize <= PAD_BUFSIZE) 293 memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, blksize); 294 else { 295 l = PAD_BUFSIZE - sc->sc_wpos; 296 memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, l); 297 memcpy(sc->sc_audiobuf, blk + l, blksize - l); 298 } 299 300 sc->sc_wpos += blksize; 301 if (sc->sc_wpos >= PAD_BUFSIZE) 302 sc->sc_wpos -= PAD_BUFSIZE; 303 304 sc->sc_buflen += blksize; 305 cv_broadcast(&sc->sc_condvar); 306 307 return 0; 308 } 309 310 static int 311 pad_get_block(struct pad_softc *sc, pad_block_t *pb, int maxblksize) 312 { 313 int l, blksize, error; 314 315 KASSERT(maxblksize > 0); 316 KASSERT(mutex_owned(&sc->sc_intr_lock)); 317 318 while (sc->sc_buflen == 0) { 319 DPRINTF("%s: wait\n", __func__); 320 error = cv_wait_sig(&sc->sc_condvar, &sc->sc_intr_lock); 321 DPRINTF("%s: wake up %d\n", __func__, err); 322 if (error) 323 return error; 324 } 325 blksize = uimin(maxblksize, sc->sc_buflen); 326 327 pb->pb_ptr = (sc->sc_audiobuf + sc->sc_rpos); 328 if (sc->sc_rpos + blksize < PAD_BUFSIZE) { 329 pb->pb_len = blksize; 330 sc->sc_rpos += blksize; 331 } else { 332 l = PAD_BUFSIZE - sc->sc_rpos; 333 pb->pb_len = l; 334 sc->sc_rpos = 0; 335 } 336 sc->sc_buflen -= pb->pb_len; 337 338 return 0; 339 } 340 341 static int 342 pad_open(dev_t dev, int flags, int fmt, struct lwp *l) 343 { 344 struct file *fp = NULL; 345 device_t self; 346 struct pad_softc *sc = NULL; 347 cfdata_t cf = NULL; 348 int error, fd; 349 350 error = fd_allocfile(&fp, &fd); 351 if (error) 352 goto out; 353 354 cf = kmem_alloc(sizeof(*cf), KM_SLEEP); 355 cf->cf_name = pad_cd.cd_name; 356 cf->cf_atname = pad_cd.cd_name; 357 cf->cf_unit = 0; 358 cf->cf_fstate = FSTATE_STAR; 359 360 self = config_attach_pseudo(cf); 361 if (self == NULL) { 362 error = ENXIO; 363 goto out; 364 } 365 sc = device_private(self); 366 KASSERT(sc->sc_dev == self); 367 cf = NULL; 368 369 error = fd_clone(fp, fd, flags, &pad_fileops, sc); 370 KASSERT(error == EMOVEFD); 371 fp = NULL; 372 sc = NULL; 373 374 out: if (sc) 375 pad_close(sc); 376 if (cf) 377 kmem_free(cf, sizeof(*cf)); 378 if (fp) 379 fd_abort(curproc, fp, fd); 380 return error; 381 } 382 383 static void 384 pad_close(struct pad_softc *sc) 385 { 386 device_t self = sc->sc_dev; 387 cfdata_t cf = device_cfdata(self); 388 389 KERNEL_LOCK(1, NULL); 390 KASSERT(sc->sc_open); 391 sc->sc_open = 0; 392 (void)config_detach(self, DETACH_FORCE); 393 KERNEL_UNLOCK_ONE(NULL); 394 395 kmem_free(cf, sizeof(*cf)); 396 } 397 398 static int 399 fops_pad_close(struct file *fp) 400 { 401 struct pad_softc *sc = fp->f_pad; 402 403 pad_close(sc); 404 405 return 0; 406 } 407 408 static int 409 fops_pad_poll(struct file *fp, int events) 410 { 411 412 return POLLERR; 413 } 414 415 static int 416 fops_pad_kqfilter(struct file *fp, struct knote *kn) 417 { 418 struct pad_softc *sc = fp->f_pad; 419 dev_t dev; 420 421 dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 422 device_unit(sc->sc_dev)); 423 424 return seltrue_kqfilter(dev, kn); 425 } 426 427 static int 428 fops_pad_ioctl(struct file *fp, u_long cmd, void *data) 429 { 430 431 return ENODEV; 432 } 433 434 static int 435 fops_pad_stat(struct file *fp, struct stat *st) 436 { 437 struct pad_softc *sc = fp->f_pad; 438 439 memset(st, 0, sizeof(*st)); 440 441 st->st_dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 442 device_unit(sc->sc_dev)); 443 444 st->st_uid = kauth_cred_geteuid(fp->f_cred); 445 st->st_gid = kauth_cred_getegid(fp->f_cred); 446 st->st_mode = S_IFCHR; 447 448 return 0; 449 } 450 451 static int 452 fops_pad_mmap(struct file *fp, off_t *offp, size_t len, int prot, int *flagsp, 453 int *advicep, struct uvm_object **uobjp, int *maxprotp) 454 { 455 456 return 1; 457 } 458 459 static int 460 fops_pad_read(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 461 int ioflag) 462 { 463 struct pad_softc *sc = fp->f_pad; 464 465 return pad_read(sc, offp, uio, cred, ioflag); 466 } 467 468 static int 469 pad_read(struct pad_softc *sc, off_t *offp, struct uio *uio, kauth_cred_t cred, 470 int ioflag) 471 { 472 pad_block_t pb; 473 int err; 474 475 err = 0; 476 DPRINTF("%s: resid=%zu\n", __func__, uio->uio_resid); 477 while (uio->uio_resid > 0) { 478 mutex_enter(&sc->sc_intr_lock); 479 err = pad_get_block(sc, &pb, uio->uio_resid); 480 mutex_exit(&sc->sc_intr_lock); 481 if (err) 482 break; 483 484 DPRINTF("%s: move %d\n", __func__, pb.pb_len); 485 err = uiomove(pb.pb_ptr, pb.pb_len, uio); 486 if (err) 487 break; 488 } 489 490 return err; 491 } 492 493 static int 494 fops_pad_write(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 495 int ioflag) 496 { 497 498 return EOPNOTSUPP; 499 } 500 501 static int 502 pad_query_format(void *opaque, audio_format_query_t *afp) 503 { 504 505 return audio_query_format(pad_formats, PAD_NFORMATS, afp); 506 } 507 508 static int 509 pad_set_format(void *opaque, int setmode, 510 const audio_params_t *play, const audio_params_t *rec, 511 audio_filter_reg_t *pfil, audio_filter_reg_t *rfil) 512 { 513 struct pad_softc *sc = opaque; 514 515 KASSERT(mutex_owned(&sc->sc_lock)); 516 517 /* XXX playback only */ 518 pfil->codec = pad_swvol_codec; 519 pfil->context = sc; 520 521 return 0; 522 } 523 524 static int 525 pad_start_output(void *opaque, void *block, int blksize, 526 void (*intr)(void *), void *intrarg) 527 { 528 struct pad_softc *sc = opaque; 529 int err; 530 int ms; 531 532 KASSERT(mutex_owned(&sc->sc_intr_lock)); 533 534 sc->sc_intr = intr; 535 sc->sc_intrarg = intrarg; 536 sc->sc_blksize = blksize; 537 538 DPRINTF("%s: blksize=%d\n", __func__, blksize); 539 err = pad_add_block(sc, block, blksize); 540 541 ms = blksize * 1000 / PADCHAN / (PADPREC / NBBY) / PADFREQ; 542 DPRINTF("%s: callout ms=%d\n", __func__, ms); 543 callout_schedule(&sc->sc_pcallout, mstohz(ms)); 544 545 return err; 546 } 547 548 static int 549 pad_halt_output(void *opaque) 550 { 551 struct pad_softc *sc = opaque; 552 553 DPRINTF("%s\n", __func__); 554 KASSERT(mutex_owned(&sc->sc_intr_lock)); 555 556 callout_halt(&sc->sc_pcallout, &sc->sc_intr_lock); 557 558 sc->sc_intr = NULL; 559 sc->sc_intrarg = NULL; 560 sc->sc_buflen = 0; 561 sc->sc_rpos = sc->sc_wpos = 0; 562 563 return 0; 564 } 565 566 static void 567 pad_done_output(void *arg) 568 { 569 struct pad_softc *sc = arg; 570 571 DPRINTF("%s\n", __func__); 572 573 mutex_enter(&sc->sc_intr_lock); 574 (*sc->sc_intr)(sc->sc_intrarg); 575 mutex_exit(&sc->sc_intr_lock); 576 } 577 578 static int 579 pad_getdev(void *opaque, struct audio_device *ret) 580 { 581 582 strlcpy(ret->name, "Virtual Audio", sizeof(ret->name)); 583 strlcpy(ret->version, osrelease, sizeof(ret->version)); 584 strlcpy(ret->config, "pad", sizeof(ret->config)); 585 586 return 0; 587 } 588 589 static int 590 pad_set_port(void *opaque, mixer_ctrl_t *mc) 591 { 592 struct pad_softc *sc = opaque; 593 594 KASSERT(mutex_owned(&sc->sc_lock)); 595 596 switch (mc->dev) { 597 case PAD_OUTPUT_MASTER_VOLUME: 598 case PAD_INPUT_DAC_VOLUME: 599 if (mc->un.value.num_channels != 1) 600 return EINVAL; 601 sc->sc_swvol = mc->un.value.level[AUDIO_MIXER_LEVEL_MONO]; 602 return 0; 603 } 604 605 return ENXIO; 606 } 607 608 static int 609 pad_get_port(void *opaque, mixer_ctrl_t *mc) 610 { 611 struct pad_softc *sc = opaque; 612 613 KASSERT(mutex_owned(&sc->sc_lock)); 614 615 switch (mc->dev) { 616 case PAD_OUTPUT_MASTER_VOLUME: 617 case PAD_INPUT_DAC_VOLUME: 618 if (mc->un.value.num_channels != 1) 619 return EINVAL; 620 mc->un.value.level[AUDIO_MIXER_LEVEL_MONO] = sc->sc_swvol; 621 return 0; 622 } 623 624 return ENXIO; 625 } 626 627 static int 628 pad_query_devinfo(void *opaque, mixer_devinfo_t *di) 629 { 630 struct pad_softc *sc __diagused = opaque; 631 632 KASSERT(mutex_owned(&sc->sc_lock)); 633 634 switch (di->index) { 635 case PAD_OUTPUT_CLASS: 636 di->mixer_class = PAD_OUTPUT_CLASS; 637 strcpy(di->label.name, AudioCoutputs); 638 di->type = AUDIO_MIXER_CLASS; 639 di->next = di->prev = AUDIO_MIXER_LAST; 640 return 0; 641 case PAD_INPUT_CLASS: 642 di->mixer_class = PAD_INPUT_CLASS; 643 strcpy(di->label.name, AudioCinputs); 644 di->type = AUDIO_MIXER_CLASS; 645 di->next = di->prev = AUDIO_MIXER_LAST; 646 return 0; 647 case PAD_OUTPUT_MASTER_VOLUME: 648 di->mixer_class = PAD_OUTPUT_CLASS; 649 strcpy(di->label.name, AudioNmaster); 650 di->type = AUDIO_MIXER_VALUE; 651 di->next = di->prev = AUDIO_MIXER_LAST; 652 di->un.v.num_channels = 1; 653 strcpy(di->un.v.units.name, AudioNvolume); 654 return 0; 655 case PAD_INPUT_DAC_VOLUME: 656 di->mixer_class = PAD_INPUT_CLASS; 657 strcpy(di->label.name, AudioNdac); 658 di->type = AUDIO_MIXER_VALUE; 659 di->next = di->prev = AUDIO_MIXER_LAST; 660 di->un.v.num_channels = 1; 661 strcpy(di->un.v.units.name, AudioNvolume); 662 return 0; 663 } 664 665 return ENXIO; 666 } 667 668 static int 669 pad_get_props(void *opaque) 670 { 671 672 return AUDIO_PROP_PLAYBACK; 673 } 674 675 static void 676 pad_get_locks(void *opaque, kmutex_t **intr, kmutex_t **thread) 677 { 678 struct pad_softc *sc = opaque; 679 680 *intr = &sc->sc_intr_lock; 681 *thread = &sc->sc_lock; 682 } 683 684 static void 685 pad_swvol_codec(audio_filter_arg_t *arg) 686 { 687 struct pad_softc *sc = arg->context; 688 const aint_t *src; 689 aint_t *dst; 690 u_int sample_count; 691 u_int i; 692 693 src = arg->src; 694 dst = arg->dst; 695 sample_count = arg->count * arg->srcfmt->channels; 696 for (i = 0; i < sample_count; i++) { 697 aint2_t v = (aint2_t)(*src++); 698 v = v * sc->sc_swvol / 255; 699 *dst++ = (aint_t)v; 700 } 701 } 702 703 MODULE(MODULE_CLASS_DRIVER, pad, "audio"); 704 705 #ifdef _MODULE 706 707 #include "ioconf.c" 708 709 devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR; 710 711 /* 712 * We need our own version of cfattach since config(1)'s ioconf does not 713 * generate what we need 714 */ 715 716 static struct cfattach *pad_cfattachinit[] = { &pad_ca, NULL }; 717 718 static struct cfattachinit pad_cfattach[] = { 719 { "pad", pad_cfattachinit }, 720 { NULL, NULL } 721 }; 722 #endif 723 724 static int 725 pad_modcmd(modcmd_t cmd, void *arg) 726 { 727 int error = 0; 728 729 switch (cmd) { 730 case MODULE_CMD_INIT: 731 #ifdef _MODULE 732 pad_cfattach[1] = cfattach_ioconf_pad[0]; 733 error = config_init_component(cfdriver_ioconf_pad, 734 pad_cfattach, cfdata_ioconf_pad); 735 if (error) 736 break; 737 738 error = devsw_attach(pad_cd.cd_name, NULL, &bmajor, 739 &pad_cdevsw, &cmajor); 740 if (error) { 741 config_fini_component(cfdriver_ioconf_pad, 742 pad_cfattach, cfdata_ioconf_pad); 743 break; 744 } 745 746 #endif 747 break; 748 749 case MODULE_CMD_FINI: 750 #ifdef _MODULE 751 error = devsw_detach(NULL, &pad_cdevsw); 752 if (error) 753 break; 754 755 error = config_fini_component(cfdriver_ioconf_pad, 756 pad_cfattach, cfdata_ioconf_pad); 757 if (error) { 758 devsw_attach(pad_cd.cd_name, NULL, &bmajor, 759 &pad_cdevsw, &cmajor); 760 break; 761 } 762 #endif 763 break; 764 765 default: 766 error = ENOTTY; 767 } 768 769 return error; 770 } 771
Indexes created Thu Oct 02 10:09:58 GMT 2025