pad.c revision 1.71
1 /* $NetBSD: pad.c,v 1.71 2021/06/14 10:14:58 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 1.71 2021/06/14 10:14:58 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 mutex_destroy(&sc->sc_lock); 262 mutex_destroy(&sc->sc_intr_lock); 263 cv_destroy(&sc->sc_condvar); 264 265 return 0; 266 } 267 268 static void 269 pad_childdet(device_t self, device_t child) 270 { 271 struct pad_softc *sc = device_private(self); 272 273 if (child == sc->sc_audiodev) 274 sc->sc_audiodev = NULL; 275 } 276 277 static int 278 pad_add_block(struct pad_softc *sc, uint8_t *blk, int blksize) 279 { 280 int l; 281 282 if (sc->sc_buflen + blksize > PAD_BUFSIZE) 283 return ENOBUFS; 284 285 if (sc->sc_wpos + blksize <= PAD_BUFSIZE) 286 memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, blksize); 287 else { 288 l = PAD_BUFSIZE - sc->sc_wpos; 289 memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, l); 290 memcpy(sc->sc_audiobuf, blk + l, blksize - l); 291 } 292 293 sc->sc_wpos += blksize; 294 if (sc->sc_wpos >= PAD_BUFSIZE) 295 sc->sc_wpos -= PAD_BUFSIZE; 296 297 sc->sc_buflen += blksize; 298 299 return 0; 300 } 301 302 static int 303 pad_get_block(struct pad_softc *sc, pad_block_t *pb, int blksize) 304 { 305 int l; 306 307 KASSERT(pb != NULL); 308 309 pb->pb_ptr = (sc->sc_audiobuf + sc->sc_rpos); 310 if (sc->sc_rpos + blksize < PAD_BUFSIZE) { 311 pb->pb_len = blksize; 312 sc->sc_rpos += blksize; 313 } else { 314 l = PAD_BUFSIZE - sc->sc_rpos; 315 pb->pb_len = l; 316 sc->sc_rpos = 0; 317 } 318 sc->sc_buflen -= pb->pb_len; 319 320 return 0; 321 } 322 323 static int 324 pad_open(dev_t dev, int flags, int fmt, struct lwp *l) 325 { 326 struct file *fp = NULL; 327 device_t self; 328 struct pad_softc *sc = NULL; 329 cfdata_t cf = NULL; 330 int error, fd; 331 332 error = fd_allocfile(&fp, &fd); 333 if (error) 334 goto out; 335 336 cf = kmem_alloc(sizeof(*cf), KM_SLEEP); 337 cf->cf_name = pad_cd.cd_name; 338 cf->cf_atname = pad_cd.cd_name; 339 cf->cf_unit = 0; 340 cf->cf_fstate = FSTATE_STAR; 341 342 self = config_attach_pseudo(cf); 343 if (self == NULL) { 344 error = ENXIO; 345 goto out; 346 } 347 sc = device_private(self); 348 KASSERT(sc->sc_dev == self); 349 cf = NULL; 350 351 error = fd_clone(fp, fd, flags, &pad_fileops, sc); 352 KASSERT(error == EMOVEFD); 353 fp = NULL; 354 sc = NULL; 355 356 out: if (sc) 357 pad_close(sc); 358 if (cf) 359 kmem_free(cf, sizeof(*cf)); 360 if (fp) 361 fd_abort(curproc, fp, fd); 362 return error; 363 } 364 365 static void 366 pad_close(struct pad_softc *sc) 367 { 368 device_t self = sc->sc_dev; 369 cfdata_t cf = device_cfdata(self); 370 371 KERNEL_LOCK(1, NULL); 372 KASSERT(sc->sc_open); 373 sc->sc_open = 0; 374 (void)config_detach(self, DETACH_FORCE); 375 KERNEL_UNLOCK_ONE(NULL); 376 377 kmem_free(cf, sizeof(*cf)); 378 } 379 380 static int 381 fops_pad_close(struct file *fp) 382 { 383 struct pad_softc *sc = fp->f_pad; 384 385 pad_close(sc); 386 387 return 0; 388 } 389 390 static int 391 fops_pad_poll(struct file *fp, int events) 392 { 393 394 return POLLERR; 395 } 396 397 static int 398 fops_pad_kqfilter(struct file *fp, struct knote *kn) 399 { 400 struct pad_softc *sc = fp->f_pad; 401 dev_t dev; 402 403 dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 404 device_unit(sc->sc_dev)); 405 406 return seltrue_kqfilter(dev, kn); 407 } 408 409 static int 410 fops_pad_ioctl(struct file *fp, u_long cmd, void *data) 411 { 412 413 return ENODEV; 414 } 415 416 static int 417 fops_pad_stat(struct file *fp, struct stat *st) 418 { 419 struct pad_softc *sc = fp->f_pad; 420 421 memset(st, 0, sizeof(*st)); 422 423 st->st_dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 424 device_unit(sc->sc_dev)); 425 426 st->st_uid = kauth_cred_geteuid(fp->f_cred); 427 st->st_gid = kauth_cred_getegid(fp->f_cred); 428 st->st_mode = S_IFCHR; 429 430 return 0; 431 } 432 433 static int 434 fops_pad_mmap(struct file *fp, off_t *offp, size_t len, int prot, int *flagsp, 435 int *advicep, struct uvm_object **uobjp, int *maxprotp) 436 { 437 438 return 1; 439 } 440 441 static int 442 fops_pad_read(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 443 int ioflag) 444 { 445 struct pad_softc *sc = fp->f_pad; 446 447 return pad_read(sc, offp, uio, cred, ioflag); 448 } 449 450 static int 451 pad_read(struct pad_softc *sc, off_t *offp, struct uio *uio, kauth_cred_t cred, 452 int ioflag) 453 { 454 pad_block_t pb; 455 int len; 456 int err; 457 458 err = 0; 459 DPRINTF("%s: resid=%zu\n", __func__, uio->uio_resid); 460 while (uio->uio_resid > 0 && !err) { 461 mutex_enter(&sc->sc_intr_lock); 462 if (sc->sc_buflen == 0) { 463 DPRINTF("%s: wait\n", __func__); 464 err = cv_wait_sig(&sc->sc_condvar, &sc->sc_intr_lock); 465 DPRINTF("%s: wake up %d\n", __func__, err); 466 mutex_exit(&sc->sc_intr_lock); 467 if (err) { 468 if (err == ERESTART) 469 err = EINTR; 470 break; 471 } 472 if (sc->sc_buflen == 0) 473 break; 474 continue; 475 } 476 477 len = uimin(uio->uio_resid, sc->sc_buflen); 478 err = pad_get_block(sc, &pb, len); 479 mutex_exit(&sc->sc_intr_lock); 480 if (err) 481 break; 482 DPRINTF("%s: move %d\n", __func__, pb.pb_len); 483 uiomove(pb.pb_ptr, pb.pb_len, uio); 484 } 485 486 return err; 487 } 488 489 static int 490 fops_pad_write(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 491 int ioflag) 492 { 493 494 return EOPNOTSUPP; 495 } 496 497 static int 498 pad_query_format(void *opaque, audio_format_query_t *afp) 499 { 500 501 return audio_query_format(pad_formats, PAD_NFORMATS, afp); 502 } 503 504 static int 505 pad_set_format(void *opaque, int setmode, 506 const audio_params_t *play, const audio_params_t *rec, 507 audio_filter_reg_t *pfil, audio_filter_reg_t *rfil) 508 { 509 struct pad_softc *sc = opaque; 510 511 KASSERT(mutex_owned(&sc->sc_lock)); 512 513 /* XXX playback only */ 514 pfil->codec = pad_swvol_codec; 515 pfil->context = sc; 516 517 return 0; 518 } 519 520 static int 521 pad_start_output(void *opaque, void *block, int blksize, 522 void (*intr)(void *), void *intrarg) 523 { 524 struct pad_softc *sc = opaque; 525 int err; 526 int ms; 527 528 KASSERT(mutex_owned(&sc->sc_intr_lock)); 529 530 sc->sc_intr = intr; 531 sc->sc_intrarg = intrarg; 532 sc->sc_blksize = blksize; 533 534 DPRINTF("%s: blksize=%d\n", __func__, blksize); 535 err = pad_add_block(sc, block, blksize); 536 cv_broadcast(&sc->sc_condvar); 537 538 ms = blksize * 1000 / PADCHAN / (PADPREC / NBBY) / PADFREQ; 539 DPRINTF("%s: callout ms=%d\n", __func__, ms); 540 callout_schedule(&sc->sc_pcallout, mstohz(ms)); 541 542 return err; 543 } 544 545 static int 546 pad_halt_output(void *opaque) 547 { 548 struct pad_softc *sc = opaque; 549 550 DPRINTF("%s\n", __func__); 551 KASSERT(mutex_owned(&sc->sc_intr_lock)); 552 553 callout_halt(&sc->sc_pcallout, &sc->sc_intr_lock); 554 555 sc->sc_intr = NULL; 556 sc->sc_intrarg = NULL; 557 sc->sc_buflen = 0; 558 sc->sc_rpos = sc->sc_wpos = 0; 559 cv_broadcast(&sc->sc_condvar); 560 561 return 0; 562 } 563 564 static void 565 pad_done_output(void *arg) 566 { 567 struct pad_softc *sc = arg; 568 569 DPRINTF("%s\n", __func__); 570 571 mutex_enter(&sc->sc_intr_lock); 572 (*sc->sc_intr)(sc->sc_intrarg); 573 mutex_exit(&sc->sc_intr_lock); 574 } 575 576 static int 577 pad_getdev(void *opaque, struct audio_device *ret) 578 { 579 580 strlcpy(ret->name, "Virtual Audio", sizeof(ret->name)); 581 strlcpy(ret->version, osrelease, sizeof(ret->version)); 582 strlcpy(ret->config, "pad", sizeof(ret->config)); 583 584 return 0; 585 } 586 587 static int 588 pad_set_port(void *opaque, mixer_ctrl_t *mc) 589 { 590 struct pad_softc *sc = opaque; 591 592 KASSERT(mutex_owned(&sc->sc_lock)); 593 594 switch (mc->dev) { 595 case PAD_OUTPUT_MASTER_VOLUME: 596 case PAD_INPUT_DAC_VOLUME: 597 if (mc->un.value.num_channels != 1) 598 return EINVAL; 599 sc->sc_swvol = mc->un.value.level[AUDIO_MIXER_LEVEL_MONO]; 600 return 0; 601 } 602 603 return ENXIO; 604 } 605 606 static int 607 pad_get_port(void *opaque, mixer_ctrl_t *mc) 608 { 609 struct pad_softc *sc = opaque; 610 611 KASSERT(mutex_owned(&sc->sc_lock)); 612 613 switch (mc->dev) { 614 case PAD_OUTPUT_MASTER_VOLUME: 615 case PAD_INPUT_DAC_VOLUME: 616 if (mc->un.value.num_channels != 1) 617 return EINVAL; 618 mc->un.value.level[AUDIO_MIXER_LEVEL_MONO] = sc->sc_swvol; 619 return 0; 620 } 621 622 return ENXIO; 623 } 624 625 static int 626 pad_query_devinfo(void *opaque, mixer_devinfo_t *di) 627 { 628 struct pad_softc *sc __diagused = opaque; 629 630 KASSERT(mutex_owned(&sc->sc_lock)); 631 632 switch (di->index) { 633 case PAD_OUTPUT_CLASS: 634 di->mixer_class = PAD_OUTPUT_CLASS; 635 strcpy(di->label.name, AudioCoutputs); 636 di->type = AUDIO_MIXER_CLASS; 637 di->next = di->prev = AUDIO_MIXER_LAST; 638 return 0; 639 case PAD_INPUT_CLASS: 640 di->mixer_class = PAD_INPUT_CLASS; 641 strcpy(di->label.name, AudioCinputs); 642 di->type = AUDIO_MIXER_CLASS; 643 di->next = di->prev = AUDIO_MIXER_LAST; 644 return 0; 645 case PAD_OUTPUT_MASTER_VOLUME: 646 di->mixer_class = PAD_OUTPUT_CLASS; 647 strcpy(di->label.name, AudioNmaster); 648 di->type = AUDIO_MIXER_VALUE; 649 di->next = di->prev = AUDIO_MIXER_LAST; 650 di->un.v.num_channels = 1; 651 strcpy(di->un.v.units.name, AudioNvolume); 652 return 0; 653 case PAD_INPUT_DAC_VOLUME: 654 di->mixer_class = PAD_INPUT_CLASS; 655 strcpy(di->label.name, AudioNdac); 656 di->type = AUDIO_MIXER_VALUE; 657 di->next = di->prev = AUDIO_MIXER_LAST; 658 di->un.v.num_channels = 1; 659 strcpy(di->un.v.units.name, AudioNvolume); 660 return 0; 661 } 662 663 return ENXIO; 664 } 665 666 static int 667 pad_get_props(void *opaque) 668 { 669 670 return AUDIO_PROP_PLAYBACK; 671 } 672 673 static void 674 pad_get_locks(void *opaque, kmutex_t **intr, kmutex_t **thread) 675 { 676 struct pad_softc *sc = opaque; 677 678 *intr = &sc->sc_intr_lock; 679 *thread = &sc->sc_lock; 680 } 681 682 static void 683 pad_swvol_codec(audio_filter_arg_t *arg) 684 { 685 struct pad_softc *sc = arg->context; 686 const aint_t *src; 687 aint_t *dst; 688 u_int sample_count; 689 u_int i; 690 691 src = arg->src; 692 dst = arg->dst; 693 sample_count = arg->count * arg->srcfmt->channels; 694 for (i = 0; i < sample_count; i++) { 695 aint2_t v = (aint2_t)(*src++); 696 v = v * sc->sc_swvol / 255; 697 *dst++ = (aint_t)v; 698 } 699 } 700 701 MODULE(MODULE_CLASS_DRIVER, pad, "audio"); 702 703 #ifdef _MODULE 704 705 #include "ioconf.c" 706 707 devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR; 708 709 /* 710 * We need our own version of cfattach since config(1)'s ioconf does not 711 * generate what we need 712 */ 713 714 static struct cfattach *pad_cfattachinit[] = { &pad_ca, NULL }; 715 716 static struct cfattachinit pad_cfattach[] = { 717 { "pad", pad_cfattachinit }, 718 { NULL, NULL } 719 }; 720 #endif 721 722 static int 723 pad_modcmd(modcmd_t cmd, void *arg) 724 { 725 int error = 0; 726 727 switch (cmd) { 728 case MODULE_CMD_INIT: 729 #ifdef _MODULE 730 pad_cfattach[1] = cfattach_ioconf_pad[0]; 731 error = config_init_component(cfdriver_ioconf_pad, 732 pad_cfattach, cfdata_ioconf_pad); 733 if (error) 734 break; 735 736 error = devsw_attach(pad_cd.cd_name, NULL, &bmajor, 737 &pad_cdevsw, &cmajor); 738 if (error) { 739 config_fini_component(cfdriver_ioconf_pad, 740 pad_cfattach, cfdata_ioconf_pad); 741 break; 742 } 743 744 #endif 745 break; 746 747 case MODULE_CMD_FINI: 748 #ifdef _MODULE 749 error = devsw_detach(NULL, &pad_cdevsw); 750 if (error) 751 break; 752 753 error = config_fini_component(cfdriver_ioconf_pad, 754 pad_cfattach, cfdata_ioconf_pad); 755 if (error) { 756 devsw_attach(pad_cd.cd_name, NULL, &bmajor, 757 &pad_cdevsw, &cmajor); 758 break; 759 } 760 #endif 761 break; 762 763 default: 764 error = ENOTTY; 765 } 766 767 return error; 768 } 769
Indexes created Thu Oct 02 10:09:58 GMT 2025