pad.c revision 1.75
1 /* $NetBSD: pad.c,v 1.75 2021/06/14 18:44:53 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 1.75 2021/06/14 18:44:53 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 /* 390 * XXX This is not quite enough to prevent racing with drvctl 391 * detach. What can happen: 392 * 393 * cpu0 cpu1 394 * 395 * pad_close 396 * take kernel lock 397 * sc->sc_open = 0 398 * drop kernel lock 399 * wait for config_misc_lock 400 * drvctl detach 401 * take kernel lock 402 * drop kernel lock 403 * wait for config_misc_lock 404 * retake kernel lock 405 * drop config_misc_lock 406 * take config_misc_lock 407 * wait for kernel lock 408 * pad_detach (sc_open=0 already) 409 * free device 410 * drop kernel lock 411 * use device after free 412 * 413 * We need a way to grab a reference to the device so it won't 414 * be freed until we're done -- it's OK if we config_detach 415 * twice as long as it's idempotent, but not OK if the first 416 * config_detach frees the struct device before the second one 417 * has finished handling it. 418 */ 419 KERNEL_LOCK(1, NULL); 420 KASSERT(sc->sc_open); 421 sc->sc_open = 0; 422 (void)config_detach(self, DETACH_FORCE); 423 KERNEL_UNLOCK_ONE(NULL); 424 425 kmem_free(cf, sizeof(*cf)); 426 } 427 428 static int 429 fops_pad_close(struct file *fp) 430 { 431 struct pad_softc *sc = fp->f_pad; 432 433 pad_close(sc); 434 435 return 0; 436 } 437 438 static int 439 fops_pad_poll(struct file *fp, int events) 440 { 441 442 return POLLERR; 443 } 444 445 static int 446 fops_pad_kqfilter(struct file *fp, struct knote *kn) 447 { 448 struct pad_softc *sc = fp->f_pad; 449 dev_t dev; 450 451 dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 452 device_unit(sc->sc_dev)); 453 454 return seltrue_kqfilter(dev, kn); 455 } 456 457 static int 458 fops_pad_ioctl(struct file *fp, u_long cmd, void *data) 459 { 460 461 return ENODEV; 462 } 463 464 static int 465 fops_pad_stat(struct file *fp, struct stat *st) 466 { 467 struct pad_softc *sc = fp->f_pad; 468 469 memset(st, 0, sizeof(*st)); 470 471 st->st_dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 472 device_unit(sc->sc_dev)); 473 474 st->st_uid = kauth_cred_geteuid(fp->f_cred); 475 st->st_gid = kauth_cred_getegid(fp->f_cred); 476 st->st_mode = S_IFCHR; 477 478 return 0; 479 } 480 481 static int 482 fops_pad_mmap(struct file *fp, off_t *offp, size_t len, int prot, int *flagsp, 483 int *advicep, struct uvm_object **uobjp, int *maxprotp) 484 { 485 486 return 1; 487 } 488 489 static int 490 fops_pad_read(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 491 int ioflag) 492 { 493 struct pad_softc *sc = fp->f_pad; 494 495 return pad_read(sc, offp, uio, cred, ioflag); 496 } 497 498 static int 499 pad_read(struct pad_softc *sc, off_t *offp, struct uio *uio, kauth_cred_t cred, 500 int ioflag) 501 { 502 pad_block_t pb; 503 int err; 504 505 err = 0; 506 DPRINTF("%s: resid=%zu\n", __func__, uio->uio_resid); 507 while (uio->uio_resid > 0) { 508 mutex_enter(&sc->sc_intr_lock); 509 err = pad_get_block(sc, &pb, uio->uio_resid); 510 mutex_exit(&sc->sc_intr_lock); 511 if (err) 512 break; 513 514 DPRINTF("%s: move %d\n", __func__, pb.pb_len); 515 err = uiomove(pb.pb_ptr, pb.pb_len, uio); 516 if (err) 517 break; 518 } 519 520 return err; 521 } 522 523 static int 524 fops_pad_write(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 525 int ioflag) 526 { 527 528 return EOPNOTSUPP; 529 } 530 531 static int 532 pad_query_format(void *opaque, audio_format_query_t *afp) 533 { 534 535 return audio_query_format(pad_formats, PAD_NFORMATS, afp); 536 } 537 538 static int 539 pad_set_format(void *opaque, int setmode, 540 const audio_params_t *play, const audio_params_t *rec, 541 audio_filter_reg_t *pfil, audio_filter_reg_t *rfil) 542 { 543 struct pad_softc *sc = opaque; 544 545 KASSERT(mutex_owned(&sc->sc_lock)); 546 547 /* XXX playback only */ 548 pfil->codec = pad_swvol_codec; 549 pfil->context = sc; 550 551 return 0; 552 } 553 554 static int 555 pad_start_output(void *opaque, void *block, int blksize, 556 void (*intr)(void *), void *intrarg) 557 { 558 struct pad_softc *sc = opaque; 559 int err; 560 int ms; 561 562 KASSERT(mutex_owned(&sc->sc_intr_lock)); 563 564 sc->sc_intr = intr; 565 sc->sc_intrarg = intrarg; 566 567 DPRINTF("%s: blksize=%d\n", __func__, blksize); 568 err = pad_add_block(sc, block, blksize); 569 570 ms = blksize * 1000 / PADCHAN / (PADPREC / NBBY) / PADFREQ; 571 DPRINTF("%s: callout ms=%d\n", __func__, ms); 572 callout_schedule(&sc->sc_pcallout, mstohz(ms)); 573 574 return err; 575 } 576 577 static int 578 pad_halt_output(void *opaque) 579 { 580 struct pad_softc *sc = opaque; 581 582 DPRINTF("%s\n", __func__); 583 KASSERT(mutex_owned(&sc->sc_intr_lock)); 584 585 callout_halt(&sc->sc_pcallout, &sc->sc_intr_lock); 586 587 sc->sc_intr = NULL; 588 sc->sc_intrarg = NULL; 589 sc->sc_buflen = 0; 590 sc->sc_rpos = sc->sc_wpos = 0; 591 592 return 0; 593 } 594 595 static void 596 pad_done_output(void *arg) 597 { 598 struct pad_softc *sc = arg; 599 600 DPRINTF("%s\n", __func__); 601 602 mutex_enter(&sc->sc_intr_lock); 603 (*sc->sc_intr)(sc->sc_intrarg); 604 mutex_exit(&sc->sc_intr_lock); 605 } 606 607 static int 608 pad_getdev(void *opaque, struct audio_device *ret) 609 { 610 611 strlcpy(ret->name, "Virtual Audio", sizeof(ret->name)); 612 strlcpy(ret->version, osrelease, sizeof(ret->version)); 613 strlcpy(ret->config, "pad", sizeof(ret->config)); 614 615 return 0; 616 } 617 618 static int 619 pad_set_port(void *opaque, mixer_ctrl_t *mc) 620 { 621 struct pad_softc *sc = opaque; 622 623 KASSERT(mutex_owned(&sc->sc_lock)); 624 625 switch (mc->dev) { 626 case PAD_OUTPUT_MASTER_VOLUME: 627 case PAD_INPUT_DAC_VOLUME: 628 if (mc->un.value.num_channels != 1) 629 return EINVAL; 630 sc->sc_swvol = mc->un.value.level[AUDIO_MIXER_LEVEL_MONO]; 631 return 0; 632 } 633 634 return ENXIO; 635 } 636 637 static int 638 pad_get_port(void *opaque, mixer_ctrl_t *mc) 639 { 640 struct pad_softc *sc = opaque; 641 642 KASSERT(mutex_owned(&sc->sc_lock)); 643 644 switch (mc->dev) { 645 case PAD_OUTPUT_MASTER_VOLUME: 646 case PAD_INPUT_DAC_VOLUME: 647 if (mc->un.value.num_channels != 1) 648 return EINVAL; 649 mc->un.value.level[AUDIO_MIXER_LEVEL_MONO] = sc->sc_swvol; 650 return 0; 651 } 652 653 return ENXIO; 654 } 655 656 static int 657 pad_query_devinfo(void *opaque, mixer_devinfo_t *di) 658 { 659 struct pad_softc *sc __diagused = opaque; 660 661 KASSERT(mutex_owned(&sc->sc_lock)); 662 663 switch (di->index) { 664 case PAD_OUTPUT_CLASS: 665 di->mixer_class = PAD_OUTPUT_CLASS; 666 strcpy(di->label.name, AudioCoutputs); 667 di->type = AUDIO_MIXER_CLASS; 668 di->next = di->prev = AUDIO_MIXER_LAST; 669 return 0; 670 case PAD_INPUT_CLASS: 671 di->mixer_class = PAD_INPUT_CLASS; 672 strcpy(di->label.name, AudioCinputs); 673 di->type = AUDIO_MIXER_CLASS; 674 di->next = di->prev = AUDIO_MIXER_LAST; 675 return 0; 676 case PAD_OUTPUT_MASTER_VOLUME: 677 di->mixer_class = PAD_OUTPUT_CLASS; 678 strcpy(di->label.name, AudioNmaster); 679 di->type = AUDIO_MIXER_VALUE; 680 di->next = di->prev = AUDIO_MIXER_LAST; 681 di->un.v.num_channels = 1; 682 strcpy(di->un.v.units.name, AudioNvolume); 683 return 0; 684 case PAD_INPUT_DAC_VOLUME: 685 di->mixer_class = PAD_INPUT_CLASS; 686 strcpy(di->label.name, AudioNdac); 687 di->type = AUDIO_MIXER_VALUE; 688 di->next = di->prev = AUDIO_MIXER_LAST; 689 di->un.v.num_channels = 1; 690 strcpy(di->un.v.units.name, AudioNvolume); 691 return 0; 692 } 693 694 return ENXIO; 695 } 696 697 static int 698 pad_get_props(void *opaque) 699 { 700 701 return AUDIO_PROP_PLAYBACK; 702 } 703 704 static void 705 pad_get_locks(void *opaque, kmutex_t **intr, kmutex_t **thread) 706 { 707 struct pad_softc *sc = opaque; 708 709 *intr = &sc->sc_intr_lock; 710 *thread = &sc->sc_lock; 711 } 712 713 static void 714 pad_swvol_codec(audio_filter_arg_t *arg) 715 { 716 struct pad_softc *sc = arg->context; 717 const aint_t *src; 718 aint_t *dst; 719 u_int sample_count; 720 u_int i; 721 722 src = arg->src; 723 dst = arg->dst; 724 sample_count = arg->count * arg->srcfmt->channels; 725 for (i = 0; i < sample_count; i++) { 726 aint2_t v = (aint2_t)(*src++); 727 v = v * sc->sc_swvol / 255; 728 *dst++ = (aint_t)v; 729 } 730 } 731 732 MODULE(MODULE_CLASS_DRIVER, pad, "audio"); 733 734 #ifdef _MODULE 735 736 #include "ioconf.c" 737 738 devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR; 739 740 /* 741 * We need our own version of cfattach since config(1)'s ioconf does not 742 * generate what we need 743 */ 744 745 static struct cfattach *pad_cfattachinit[] = { &pad_ca, NULL }; 746 747 static struct cfattachinit pad_cfattach[] = { 748 { "pad", pad_cfattachinit }, 749 { NULL, NULL } 750 }; 751 #endif 752 753 static int 754 pad_modcmd(modcmd_t cmd, void *arg) 755 { 756 int error = 0; 757 758 switch (cmd) { 759 case MODULE_CMD_INIT: 760 #ifdef _MODULE 761 pad_cfattach[1] = cfattach_ioconf_pad[0]; 762 error = config_init_component(cfdriver_ioconf_pad, 763 pad_cfattach, cfdata_ioconf_pad); 764 if (error) 765 break; 766 767 error = devsw_attach(pad_cd.cd_name, NULL, &bmajor, 768 &pad_cdevsw, &cmajor); 769 if (error) { 770 config_fini_component(cfdriver_ioconf_pad, 771 pad_cfattach, cfdata_ioconf_pad); 772 break; 773 } 774 775 #endif 776 break; 777 778 case MODULE_CMD_FINI: 779 #ifdef _MODULE 780 error = devsw_detach(NULL, &pad_cdevsw); 781 if (error) 782 break; 783 784 error = config_fini_component(cfdriver_ioconf_pad, 785 pad_cfattach, cfdata_ioconf_pad); 786 if (error) { 787 devsw_attach(pad_cd.cd_name, NULL, &bmajor, 788 &pad_cdevsw, &cmajor); 789 break; 790 } 791 #endif 792 break; 793 794 default: 795 error = ENOTTY; 796 } 797 798 return error; 799 } 800
Indexes created Thu Oct 02 07:10:07 GMT 2025