pad.c revision 1.25
1 /* $NetBSD: pad.c,v 1.25 2016/07/07 06:55:41 msaitoh 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 1.25 2016/07/07 06:55:41 msaitoh Exp $"); 31 32 #include <sys/types.h> 33 #include <sys/param.h> 34 #include <sys/conf.h> 35 #include <sys/buf.h> 36 #include <sys/kmem.h> 37 #include <sys/kernel.h> 38 #include <sys/device.h> 39 #include <sys/proc.h> 40 #include <sys/condvar.h> 41 #include <sys/select.h> 42 #include <sys/audioio.h> 43 #include <sys/vnode.h> 44 #include <sys/module.h> 45 #include <sys/atomic.h> 46 #include <sys/time.h> 47 48 #include <dev/audio_if.h> 49 #include <dev/audiovar.h> 50 #include <dev/auconv.h> 51 #include <dev/auvolconv.h> 52 53 #include <dev/pad/padvar.h> 54 55 #define PADUNIT(x) minor(x) 56 57 extern struct cfdriver pad_cd; 58 59 typedef struct pad_block { 60 uint8_t *pb_ptr; 61 int pb_len; 62 } pad_block_t; 63 64 enum { 65 PAD_OUTPUT_CLASS, 66 PAD_INPUT_CLASS, 67 PAD_OUTPUT_MASTER_VOLUME, 68 PAD_INPUT_DAC_VOLUME, 69 PAD_ENUM_LAST, 70 }; 71 72 static int pad_match(device_t, cfdata_t, void *); 73 static void pad_attach(device_t, device_t, void *); 74 static int pad_detach(device_t, int); 75 static void pad_childdet(device_t, device_t); 76 77 static int pad_query_encoding(void *, struct audio_encoding *); 78 static int pad_set_params(void *, int, int, 79 audio_params_t *, audio_params_t *, 80 stream_filter_list_t *, stream_filter_list_t *); 81 static int pad_start_output(void *, void *, int, 82 void (*)(void *), void *); 83 static int pad_start_input(void *, void *, int, 84 void (*)(void *), void *); 85 static int pad_halt_output(void *); 86 static int pad_halt_input(void *); 87 static int pad_getdev(void *, struct audio_device *); 88 static int pad_set_port(void *, mixer_ctrl_t *); 89 static int pad_get_port(void *, mixer_ctrl_t *); 90 static int pad_query_devinfo(void *, mixer_devinfo_t *); 91 static int pad_get_props(void *); 92 static int pad_round_blocksize(void *, int, int, const audio_params_t *); 93 static void pad_get_locks(void *, kmutex_t **, kmutex_t **); 94 95 static stream_filter_t *pad_swvol_filter_le(struct audio_softc *, 96 const audio_params_t *, const audio_params_t *); 97 static stream_filter_t *pad_swvol_filter_be(struct audio_softc *, 98 const audio_params_t *, const audio_params_t *); 99 static void pad_swvol_dtor(stream_filter_t *); 100 101 static const struct audio_hw_if pad_hw_if = { 102 .query_encoding = pad_query_encoding, 103 .set_params = pad_set_params, 104 .start_output = pad_start_output, 105 .start_input = pad_start_input, 106 .halt_output = pad_halt_output, 107 .halt_input = pad_halt_input, 108 .getdev = pad_getdev, 109 .set_port = pad_set_port, 110 .get_port = pad_get_port, 111 .query_devinfo = pad_query_devinfo, 112 .get_props = pad_get_props, 113 .round_blocksize = pad_round_blocksize, 114 .get_locks = pad_get_locks, 115 }; 116 117 #define PAD_NFORMATS 1 118 static const struct audio_format pad_formats[PAD_NFORMATS] = { 119 { NULL, AUMODE_PLAY|AUMODE_RECORD, AUDIO_ENCODING_SLINEAR_LE, 16, 16, 120 2, AUFMT_STEREO, 1, { 44100 } }, 121 }; 122 123 extern void padattach(int); 124 125 static int pad_add_block(pad_softc_t *, uint8_t *, int); 126 static int pad_get_block(pad_softc_t *, pad_block_t *, int); 127 128 dev_type_open(pad_open); 129 dev_type_close(pad_close); 130 dev_type_read(pad_read); 131 132 const struct cdevsw pad_cdevsw = { 133 .d_open = pad_open, 134 .d_close = pad_close, 135 .d_read = pad_read, 136 .d_write = nowrite, 137 .d_ioctl = noioctl, 138 .d_stop = nostop, 139 .d_tty = notty, 140 .d_poll = nopoll, 141 .d_mmap = nommap, 142 .d_kqfilter = nokqfilter, 143 .d_discard = nodiscard, 144 .d_flag = D_OTHER | D_MPSAFE, 145 }; 146 147 CFATTACH_DECL2_NEW(pad, sizeof(pad_softc_t), pad_match, pad_attach, pad_detach, 148 NULL, NULL, pad_childdet); 149 150 void 151 padattach(int n) 152 { 153 int i, err; 154 cfdata_t cf; 155 156 aprint_debug("pad: requested %d units\n", n); 157 158 err = config_cfattach_attach(pad_cd.cd_name, &pad_ca); 159 if (err) { 160 aprint_error("%s: couldn't register cfattach: %d\n", 161 pad_cd.cd_name, err); 162 config_cfdriver_detach(&pad_cd); 163 return; 164 } 165 166 for (i = 0; i < n; i++) { 167 cf = kmem_alloc(sizeof(struct cfdata), KM_SLEEP); 168 if (cf == NULL) { 169 aprint_error("%s: couldn't allocate cfdata\n", 170 pad_cd.cd_name); 171 continue; 172 } 173 cf->cf_name = pad_cd.cd_name; 174 cf->cf_atname = pad_cd.cd_name; 175 cf->cf_unit = i; 176 cf->cf_fstate = FSTATE_STAR; 177 178 (void)config_attach_pseudo(cf); 179 } 180 181 return; 182 } 183 184 static int 185 pad_add_block(pad_softc_t *sc, uint8_t *blk, int blksize) 186 { 187 int l; 188 189 if (sc->sc_open == 0) 190 return EIO; 191 192 KASSERT(mutex_owned(&sc->sc_lock)); 193 194 if (sc->sc_buflen + blksize > PAD_BUFSIZE) 195 return ENOBUFS; 196 197 if (sc->sc_wpos + blksize <= PAD_BUFSIZE) 198 memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, blksize); 199 else { 200 l = PAD_BUFSIZE - sc->sc_wpos; 201 memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, l); 202 memcpy(sc->sc_audiobuf, blk + l, blksize - l); 203 } 204 205 sc->sc_wpos += blksize; 206 if (sc->sc_wpos > PAD_BUFSIZE) 207 sc->sc_wpos -= PAD_BUFSIZE; 208 209 sc->sc_buflen += blksize; 210 211 return 0; 212 } 213 214 static int 215 pad_get_block(pad_softc_t *sc, pad_block_t *pb, int blksize) 216 { 217 int l; 218 219 KASSERT(mutex_owned(&sc->sc_lock)); 220 KASSERT(pb != NULL); 221 222 if (sc->sc_buflen < blksize) 223 return ERESTART; 224 225 pb->pb_ptr = (sc->sc_audiobuf + sc->sc_rpos); 226 if (sc->sc_rpos + blksize < PAD_BUFSIZE) { 227 pb->pb_len = blksize; 228 sc->sc_rpos += blksize; 229 } else { 230 l = PAD_BUFSIZE - sc->sc_rpos; 231 pb->pb_len = l; 232 sc->sc_rpos = 0; 233 } 234 sc->sc_buflen -= pb->pb_len; 235 236 return 0; 237 } 238 239 static int 240 pad_match(device_t parent, cfdata_t data, void *opaque) 241 { 242 243 return 1; 244 } 245 246 static void 247 pad_childdet(device_t self, device_t child) 248 { 249 pad_softc_t *sc = device_private(self); 250 251 sc->sc_audiodev = NULL; 252 } 253 254 static void 255 pad_attach(device_t parent, device_t self, void *opaque) 256 { 257 pad_softc_t *sc = device_private(self); 258 259 aprint_normal_dev(self, "outputs: 44100Hz, 16-bit, stereo\n"); 260 261 sc->sc_dev = self; 262 sc->sc_open = 0; 263 if (auconv_create_encodings(pad_formats, PAD_NFORMATS, 264 &sc->sc_encodings) != 0) { 265 aprint_error_dev(self, "couldn't create encodings\n"); 266 return; 267 } 268 269 cv_init(&sc->sc_condvar, device_xname(self)); 270 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 271 mutex_init(&sc->sc_intr_lock, MUTEX_DEFAULT, IPL_NONE); 272 273 sc->sc_swvol = 255; 274 sc->sc_buflen = 0; 275 sc->sc_rpos = sc->sc_wpos = 0; 276 sc->sc_audiodev = (void *)audio_attach_mi(&pad_hw_if, sc, sc->sc_dev); 277 278 if (!pmf_device_register(self, NULL, NULL)) 279 aprint_error_dev(self, "couldn't establish power handler\n"); 280 281 return; 282 } 283 284 static int 285 pad_detach(device_t self, int flags) 286 { 287 pad_softc_t *sc = device_private(self); 288 int cmaj, mn, rc; 289 290 cmaj = cdevsw_lookup_major(&pad_cdevsw); 291 mn = device_unit(self); 292 vdevgone(cmaj, mn, mn, VCHR); 293 294 if ((rc = config_detach_children(self, flags)) != 0) 295 return rc; 296 297 pmf_device_deregister(self); 298 299 mutex_destroy(&sc->sc_lock); 300 mutex_destroy(&sc->sc_intr_lock); 301 cv_destroy(&sc->sc_condvar); 302 303 auconv_delete_encodings(sc->sc_encodings); 304 305 return 0; 306 } 307 308 int 309 pad_open(dev_t dev, int flags, int fmt, struct lwp *l) 310 { 311 pad_softc_t *sc; 312 313 sc = device_lookup_private(&pad_cd, PADUNIT(dev)); 314 if (sc == NULL) 315 return ENXIO; 316 317 if (atomic_swap_uint(&sc->sc_open, 1) != 0) { 318 return EBUSY; 319 } 320 321 getmicrotime(&sc->sc_last); 322 sc->sc_bytes_count = 0; 323 324 return 0; 325 } 326 327 int 328 pad_close(dev_t dev, int flags, int fmt, struct lwp *l) 329 { 330 pad_softc_t *sc; 331 332 sc = device_lookup_private(&pad_cd, PADUNIT(dev)); 333 if (sc == NULL) 334 return ENXIO; 335 336 KASSERT(sc->sc_open > 0); 337 sc->sc_open = 0; 338 339 return 0; 340 } 341 342 #define PAD_BYTES_PER_SEC (44100 * sizeof(int16_t) * 2) 343 #define TIMENEXTREAD (20 * 1000) 344 #define BYTESTOSLEEP (PAD_BYTES_PER_SEC / (1000000 / TIMENEXTREAD)) 345 346 int 347 pad_read(dev_t dev, struct uio *uio, int flags) 348 { 349 struct timeval now; 350 uint64_t nowusec, lastusec; 351 pad_softc_t *sc; 352 pad_block_t pb; 353 void (*intr)(void *); 354 void *intrarg; 355 int err, wait_ticks; 356 357 sc = device_lookup_private(&pad_cd, PADUNIT(dev)); 358 if (sc == NULL) 359 return ENXIO; 360 361 err = 0; 362 363 mutex_enter(&sc->sc_lock); 364 intr = sc->sc_intr; 365 intrarg = sc->sc_intrarg; 366 367 while (uio->uio_resid > 0 && !err) { 368 getmicrotime(&now); 369 nowusec = (now.tv_sec * 1000000) + now.tv_usec; 370 lastusec = (sc->sc_last.tv_sec * 1000000) + 371 sc->sc_last.tv_usec; 372 if (lastusec + TIMENEXTREAD > nowusec && 373 sc->sc_bytes_count >= BYTESTOSLEEP) { 374 wait_ticks = (hz * ((lastusec + TIMENEXTREAD) - 375 nowusec)) / 1000000; 376 if (wait_ticks > 0) { 377 kpause("padwait", TRUE, wait_ticks, 378 &sc->sc_lock); 379 } 380 381 sc->sc_bytes_count -= BYTESTOSLEEP; 382 getmicrotime(&sc->sc_last); 383 } else if (sc->sc_bytes_count >= BYTESTOSLEEP) { 384 sc->sc_bytes_count -= BYTESTOSLEEP; 385 getmicrotime(&sc->sc_last); 386 } else if (lastusec + TIMENEXTREAD <= nowusec) 387 getmicrotime(&sc->sc_last); 388 389 err = pad_get_block(sc, &pb, min(uio->uio_resid, PAD_BLKSIZE)); 390 if (!err) { 391 sc->sc_bytes_count += pb.pb_len; 392 393 mutex_exit(&sc->sc_lock); 394 err = uiomove(pb.pb_ptr, pb.pb_len, uio); 395 mutex_enter(&sc->sc_lock); 396 continue; 397 } 398 399 if (intr) { 400 mutex_enter(&sc->sc_intr_lock); 401 kpreempt_disable(); 402 (*intr)(intrarg); 403 kpreempt_enable(); 404 mutex_exit(&sc->sc_intr_lock); 405 intr = sc->sc_intr; 406 intrarg = sc->sc_intrarg; 407 err = 0; 408 continue; 409 } 410 err = cv_wait_sig(&sc->sc_condvar, &sc->sc_lock); 411 if (err != 0) 412 break; 413 414 intr = sc->sc_intr; 415 intrarg = sc->sc_intrarg; 416 } 417 mutex_exit(&sc->sc_lock); 418 419 return err; 420 } 421 422 static int 423 pad_query_encoding(void *opaque, struct audio_encoding *ae) 424 { 425 pad_softc_t *sc; 426 427 sc = (pad_softc_t *)opaque; 428 429 KASSERT(mutex_owned(&sc->sc_lock)); 430 431 return auconv_query_encoding(sc->sc_encodings, ae); 432 } 433 434 static int 435 pad_set_params(void *opaque, int setmode, int usemode, 436 audio_params_t *play, audio_params_t *rec, 437 stream_filter_list_t *pfil, stream_filter_list_t *rfil) 438 { 439 pad_softc_t *sc __diagused; 440 441 sc = (pad_softc_t *)opaque; 442 443 KASSERT(mutex_owned(&sc->sc_lock)); 444 445 if (auconv_set_converter(pad_formats, PAD_NFORMATS, AUMODE_PLAY, 446 play, true, pfil) < 0) 447 return EINVAL; 448 if (auconv_set_converter(pad_formats, PAD_NFORMATS, AUMODE_RECORD, 449 rec, true, rfil) < 0) 450 return EINVAL; 451 452 if (pfil->req_size > 0) 453 play = &pfil->filters[0].param; 454 switch (play->encoding) { 455 case AUDIO_ENCODING_SLINEAR_LE: 456 if (play->precision == 16 && play->validbits == 16) 457 pfil->prepend(pfil, pad_swvol_filter_le, play); 458 break; 459 case AUDIO_ENCODING_SLINEAR_BE: 460 if (play->precision == 16 && play->validbits == 16) 461 pfil->prepend(pfil, pad_swvol_filter_be, play); 462 break; 463 default: 464 break; 465 } 466 467 return 0; 468 } 469 470 static int 471 pad_start_output(void *opaque, void *block, int blksize, 472 void (*intr)(void *), void *intrarg) 473 { 474 pad_softc_t *sc; 475 int err; 476 477 sc = (pad_softc_t *)opaque; 478 479 KASSERT(mutex_owned(&sc->sc_lock)); 480 481 sc->sc_intr = intr; 482 sc->sc_intrarg = intrarg; 483 sc->sc_blksize = blksize; 484 485 err = pad_add_block(sc, block, blksize); 486 487 cv_broadcast(&sc->sc_condvar); 488 489 return err; 490 } 491 492 static int 493 pad_start_input(void *opaque, void *block, int blksize, 494 void (*intr)(void *), void *intrarg) 495 { 496 pad_softc_t *sc __diagused; 497 498 sc = (pad_softc_t *)opaque; 499 500 KASSERT(mutex_owned(&sc->sc_lock)); 501 502 return EOPNOTSUPP; 503 } 504 505 static int 506 pad_halt_output(void *opaque) 507 { 508 pad_softc_t *sc; 509 510 sc = (pad_softc_t *)opaque; 511 512 KASSERT(mutex_owned(&sc->sc_lock)); 513 514 sc->sc_intr = NULL; 515 sc->sc_intrarg = NULL; 516 sc->sc_buflen = 0; 517 sc->sc_rpos = sc->sc_wpos = 0; 518 519 return 0; 520 } 521 522 static int 523 pad_halt_input(void *opaque) 524 { 525 pad_softc_t *sc __diagused; 526 527 sc = (pad_softc_t *)opaque; 528 529 KASSERT(mutex_owned(&sc->sc_lock)); 530 531 return 0; 532 } 533 534 static int 535 pad_getdev(void *opaque, struct audio_device *ret) 536 { 537 strlcpy(ret->name, "Virtual Audio", sizeof(ret->name)); 538 strlcpy(ret->version, osrelease, sizeof(ret->version)); 539 strlcpy(ret->config, "pad", sizeof(ret->config)); 540 541 return 0; 542 } 543 544 static int 545 pad_set_port(void *opaque, mixer_ctrl_t *mc) 546 { 547 pad_softc_t *sc; 548 549 sc = (pad_softc_t *)opaque; 550 551 KASSERT(mutex_owned(&sc->sc_lock)); 552 553 switch (mc->dev) { 554 case PAD_OUTPUT_MASTER_VOLUME: 555 case PAD_INPUT_DAC_VOLUME: 556 sc->sc_swvol = mc->un.value.level[AUDIO_MIXER_LEVEL_MONO]; 557 return 0; 558 } 559 560 return ENXIO; 561 } 562 563 static int 564 pad_get_port(void *opaque, mixer_ctrl_t *mc) 565 { 566 pad_softc_t *sc; 567 568 sc = (pad_softc_t *)opaque; 569 570 KASSERT(mutex_owned(&sc->sc_lock)); 571 572 switch (mc->dev) { 573 case PAD_OUTPUT_MASTER_VOLUME: 574 case PAD_INPUT_DAC_VOLUME: 575 mc->un.value.level[AUDIO_MIXER_LEVEL_MONO] = sc->sc_swvol; 576 return 0; 577 } 578 579 return ENXIO; 580 } 581 582 static int 583 pad_query_devinfo(void *opaque, mixer_devinfo_t *di) 584 { 585 pad_softc_t *sc __diagused; 586 587 sc = (pad_softc_t *)opaque; 588 589 KASSERT(mutex_owned(&sc->sc_lock)); 590 591 switch (di->index) { 592 case PAD_OUTPUT_CLASS: 593 di->mixer_class = PAD_OUTPUT_CLASS; 594 strcpy(di->label.name, AudioCoutputs); 595 di->type = AUDIO_MIXER_CLASS; 596 di->next = di->prev = AUDIO_MIXER_LAST; 597 return 0; 598 case PAD_INPUT_CLASS: 599 di->mixer_class = PAD_INPUT_CLASS; 600 strcpy(di->label.name, AudioCinputs); 601 di->type = AUDIO_MIXER_CLASS; 602 di->next = di->prev = AUDIO_MIXER_LAST; 603 return 0; 604 case PAD_OUTPUT_MASTER_VOLUME: 605 di->mixer_class = PAD_OUTPUT_CLASS; 606 strcpy(di->label.name, AudioNmaster); 607 di->type = AUDIO_MIXER_VALUE; 608 di->next = di->prev = AUDIO_MIXER_LAST; 609 di->un.v.num_channels = 1; 610 strcpy(di->un.v.units.name, AudioNvolume); 611 return 0; 612 case PAD_INPUT_DAC_VOLUME: 613 di->mixer_class = PAD_INPUT_CLASS; 614 strcpy(di->label.name, AudioNdac); 615 di->type = AUDIO_MIXER_VALUE; 616 di->next = di->prev = AUDIO_MIXER_LAST; 617 di->un.v.num_channels = 1; 618 strcpy(di->un.v.units.name, AudioNvolume); 619 return 0; 620 } 621 622 return ENXIO; 623 } 624 625 static int 626 pad_get_props(void *opaque) 627 { 628 pad_softc_t *sc __diagused; 629 630 sc = (pad_softc_t *)opaque; 631 632 KASSERT(mutex_owned(&sc->sc_lock)); 633 634 return 0; 635 } 636 637 static int 638 pad_round_blocksize(void *opaque, int blksize, int mode, 639 const audio_params_t *p) 640 { 641 pad_softc_t *sc __diagused; 642 643 sc = (pad_softc_t *)opaque; 644 KASSERT(mutex_owned(&sc->sc_lock)); 645 646 return PAD_BLKSIZE; 647 } 648 649 static void 650 pad_get_locks(void *opaque, kmutex_t **intr, kmutex_t **thread) 651 { 652 pad_softc_t *sc; 653 654 sc = (pad_softc_t *)opaque; 655 656 *intr = &sc->sc_intr_lock; 657 *thread = &sc->sc_lock; 658 } 659 660 static stream_filter_t * 661 pad_swvol_filter_le(struct audio_softc *asc, 662 const audio_params_t *from, const audio_params_t *to) 663 { 664 auvolconv_filter_t *this; 665 device_t dev = audio_get_device(asc); 666 struct pad_softc *sc = device_private(dev); 667 668 this = kmem_alloc(sizeof(auvolconv_filter_t), KM_SLEEP); 669 this->base.base.fetch_to = auvolconv_slinear16_le_fetch_to; 670 this->base.dtor = pad_swvol_dtor; 671 this->base.set_fetcher = stream_filter_set_fetcher; 672 this->base.set_inputbuffer = stream_filter_set_inputbuffer; 673 this->vol = &sc->sc_swvol; 674 675 return (stream_filter_t *)this; 676 } 677 678 static stream_filter_t * 679 pad_swvol_filter_be(struct audio_softc *asc, 680 const audio_params_t *from, const audio_params_t *to) 681 { 682 auvolconv_filter_t *this; 683 device_t dev = audio_get_device(asc); 684 struct pad_softc *sc = device_private(dev); 685 686 this = kmem_alloc(sizeof(auvolconv_filter_t), KM_SLEEP); 687 this->base.base.fetch_to = auvolconv_slinear16_be_fetch_to; 688 this->base.dtor = pad_swvol_dtor; 689 this->base.set_fetcher = stream_filter_set_fetcher; 690 this->base.set_inputbuffer = stream_filter_set_inputbuffer; 691 this->vol = &sc->sc_swvol; 692 693 return (stream_filter_t *)this; 694 } 695 696 static void 697 pad_swvol_dtor(stream_filter_t *this) 698 { 699 if (this) 700 kmem_free(this, sizeof(auvolconv_filter_t)); 701 } 702 703 #ifdef _MODULE 704 705 MODULE(MODULE_CLASS_DRIVER, pad, NULL); 706 707 static const struct cfiattrdata audiobuscf_iattrdata = { 708 "audiobus", 0, { { NULL, NULL, 0 }, } 709 }; 710 static const struct cfiattrdata * const pad_attrs[] = { 711 &audiobuscf_iattrdata, NULL 712 }; 713 714 CFDRIVER_DECL(pad, DV_DULL, pad_attrs); 715 extern struct cfattach pad_ca; 716 static int padloc[] = { -1, -1 }; 717 718 static struct cfdata pad_cfdata[] = { 719 { 720 .cf_name = "pad", 721 .cf_atname = "pad", 722 .cf_unit = 0, 723 .cf_fstate = FSTATE_STAR, 724 .cf_loc = padloc, 725 .cf_flags = 0, 726 .cf_pspec = NULL, 727 }, 728 { NULL, NULL, 0, 0, NULL, 0, NULL } 729 }; 730 731 static int 732 pad_modcmd(modcmd_t cmd, void *arg) 733 { 734 devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR; 735 int error; 736 737 switch (cmd) { 738 case MODULE_CMD_INIT: 739 error = config_cfdriver_attach(&pad_cd); 740 if (error) { 741 return error; 742 } 743 744 error = config_cfattach_attach(pad_cd.cd_name, &pad_ca); 745 if (error) { 746 config_cfdriver_detach(&pad_cd); 747 aprint_error("%s: unable to register cfattach\n", 748 pad_cd.cd_name); 749 750 return error; 751 } 752 753 error = config_cfdata_attach(pad_cfdata, 1); 754 if (error) { 755 config_cfattach_detach(pad_cd.cd_name, &pad_ca); 756 config_cfdriver_detach(&pad_cd); 757 aprint_error("%s: unable to register cfdata\n", 758 pad_cd.cd_name); 759 760 return error; 761 } 762 763 error = devsw_attach(pad_cd.cd_name, NULL, &bmajor, 764 &pad_cdevsw, &cmajor); 765 if (error) { 766 error = config_cfdata_detach(pad_cfdata); 767 if (error) { 768 return error; 769 } 770 config_cfattach_detach(pad_cd.cd_name, &pad_ca); 771 config_cfdriver_detach(&pad_cd); 772 aprint_error("%s: unable to register devsw\n", 773 pad_cd.cd_name); 774 775 return error; 776 } 777 778 (void)config_attach_pseudo(pad_cfdata); 779 780 return 0; 781 case MODULE_CMD_FINI: 782 error = config_cfdata_detach(pad_cfdata); 783 if (error) { 784 return error; 785 } 786 787 config_cfattach_detach(pad_cd.cd_name, &pad_ca); 788 config_cfdriver_detach(&pad_cd); 789 devsw_detach(NULL, &pad_cdevsw); 790 791 return 0; 792 default: 793 return ENOTTY; 794 } 795 } 796 797 #endif 798
Indexes created Thu Oct 02 10:09:58 GMT 2025