pad.c revision 1.69
1 /* $NetBSD: pad.c,v 1.69 2021/06/14 10:14:01 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 1.69 2021/06/14 10:14:01 riastradh 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/file.h> 37 #include <sys/filedesc.h> 38 #include <sys/vnode.h> 39 #include <sys/kauth.h> 40 #include <sys/kmem.h> 41 #include <sys/kernel.h> 42 #include <sys/device.h> 43 #include <sys/poll.h> 44 #include <sys/proc.h> 45 #include <sys/condvar.h> 46 #include <sys/select.h> 47 #include <sys/stat.h> 48 #include <sys/audioio.h> 49 #include <sys/module.h> 50 51 #include <dev/audio/audio_if.h> 52 #include <dev/audio/audiovar.h> 53 54 #include <dev/pad/padvar.h> 55 56 /* #define PAD_DEBUG */ 57 #ifdef PAD_DEBUG 58 #define DPRINTF(fmt...) printf(fmt) 59 #else 60 #define DPRINTF(fmt...) /**/ 61 #endif 62 63 #define MAXDEVS 128 64 #define PADCLONER 254 65 #define PADUNIT(x) minor(x) 66 67 #define PADFREQ 44100 68 #define PADCHAN 2 69 #define PADPREC 16 70 71 extern struct cfdriver pad_cd; 72 kmutex_t padconfig; 73 74 typedef struct pad_block { 75 uint8_t *pb_ptr; 76 int pb_len; 77 } pad_block_t; 78 79 enum { 80 PAD_OUTPUT_CLASS, 81 PAD_INPUT_CLASS, 82 PAD_OUTPUT_MASTER_VOLUME, 83 PAD_INPUT_DAC_VOLUME, 84 PAD_ENUM_LAST, 85 }; 86 87 static int pad_match(device_t, cfdata_t, void *); 88 static void pad_attach(device_t, device_t, void *); 89 static int pad_detach(device_t, int); 90 static void pad_childdet(device_t, device_t); 91 92 static int pad_query_format(void *, audio_format_query_t *); 93 static int pad_set_format(void *, int, 94 const audio_params_t *, const audio_params_t *, 95 audio_filter_reg_t *, audio_filter_reg_t *); 96 static int pad_start_output(void *, void *, int, 97 void (*)(void *), void *); 98 static int pad_halt_output(void *); 99 static int pad_getdev(void *, struct audio_device *); 100 static int pad_set_port(void *, mixer_ctrl_t *); 101 static int pad_get_port(void *, mixer_ctrl_t *); 102 static int pad_query_devinfo(void *, mixer_devinfo_t *); 103 static int pad_get_props(void *); 104 static void pad_get_locks(void *, kmutex_t **, kmutex_t **); 105 106 static void pad_done_output(void *); 107 static void pad_swvol_codec(audio_filter_arg_t *); 108 109 static int pad_close(struct pad_softc *); 110 static int pad_read(struct pad_softc *, off_t *, struct uio *, 111 kauth_cred_t, int); 112 113 static int fops_pad_close(struct file *); 114 static int fops_pad_read(struct file *, off_t *, struct uio *, 115 kauth_cred_t, int); 116 static int fops_pad_write(struct file *, off_t *, struct uio *, 117 kauth_cred_t, int); 118 static int fops_pad_ioctl(struct file *, u_long, void *); 119 static int fops_pad_kqfilter(struct file *, struct knote *); 120 static int fops_pad_poll(struct file *, int); 121 static int fops_pad_stat(struct file *, struct stat *); 122 static int fops_pad_mmap(struct file *, off_t *, size_t, int, int *, int *, 123 struct uvm_object **, int *); 124 125 static const struct audio_hw_if pad_hw_if = { 126 .query_format = pad_query_format, 127 .set_format = pad_set_format, 128 .start_output = pad_start_output, 129 .halt_output = pad_halt_output, 130 .getdev = pad_getdev, 131 .set_port = pad_set_port, 132 .get_port = pad_get_port, 133 .query_devinfo = pad_query_devinfo, 134 .get_props = pad_get_props, 135 .get_locks = pad_get_locks, 136 }; 137 138 #define PAD_NFORMATS 1 139 static const struct audio_format pad_formats[PAD_NFORMATS] = { 140 { 141 .mode = AUMODE_PLAY, 142 .encoding = AUDIO_ENCODING_SLINEAR_LE, 143 .validbits = PADPREC, 144 .precision = PADPREC, 145 .channels = PADCHAN, 146 .channel_mask = AUFMT_STEREO, 147 .frequency_type = 1, 148 .frequency = { PADFREQ }, 149 }, 150 }; 151 152 extern void padattach(int); 153 154 static int pad_add_block(struct pad_softc *, uint8_t *, int); 155 static int pad_get_block(struct pad_softc *, pad_block_t *, int); 156 157 dev_type_open(cdev_pad_open); 158 dev_type_close(cdev_pad_close); 159 dev_type_read(cdev_pad_read); 160 161 const struct cdevsw pad_cdevsw = { 162 .d_open = cdev_pad_open, 163 .d_close = cdev_pad_close, 164 .d_read = cdev_pad_read, 165 .d_write = nowrite, 166 .d_ioctl = noioctl, 167 .d_stop = nostop, 168 .d_tty = notty, 169 .d_poll = nopoll, 170 .d_mmap = nommap, 171 .d_kqfilter = nokqfilter, 172 .d_discard = nodiscard, 173 .d_flag = D_OTHER | D_MPSAFE, 174 }; 175 176 const struct fileops pad_fileops = { 177 .fo_name = "pad", 178 .fo_read = fops_pad_read, 179 .fo_write = fops_pad_write, 180 .fo_ioctl = fops_pad_ioctl, 181 .fo_fcntl = fnullop_fcntl, 182 .fo_stat = fops_pad_stat, 183 .fo_poll = fops_pad_poll, 184 .fo_close = fops_pad_close, 185 .fo_mmap = fops_pad_mmap, 186 .fo_kqfilter = fops_pad_kqfilter, 187 .fo_restart = fnullop_restart 188 }; 189 190 CFATTACH_DECL2_NEW(pad, sizeof(struct pad_softc), 191 pad_match, pad_attach, pad_detach, 192 NULL, NULL, pad_childdet); 193 194 void 195 padattach(int n) 196 { 197 int error; 198 199 error = config_cfattach_attach(pad_cd.cd_name, &pad_ca); 200 if (error) { 201 aprint_error("%s: couldn't register cfattach: %d\n", 202 pad_cd.cd_name, error); 203 config_cfdriver_detach(&pad_cd); 204 return; 205 } 206 mutex_init(&padconfig, MUTEX_DEFAULT, IPL_NONE); 207 208 return; 209 } 210 211 static int 212 pad_match(device_t parent, cfdata_t data, void *opaque) 213 { 214 215 return 1; 216 } 217 218 static void 219 pad_attach(device_t parent, device_t self, void *opaque) 220 { 221 struct pad_softc *sc = device_private(self); 222 223 aprint_normal_dev(self, "outputs: 44100Hz, 16-bit, stereo\n"); 224 225 sc->sc_dev = self; 226 227 cv_init(&sc->sc_condvar, device_xname(sc->sc_dev)); 228 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 229 mutex_init(&sc->sc_intr_lock, MUTEX_DEFAULT, IPL_SOFTCLOCK); 230 callout_init(&sc->sc_pcallout, CALLOUT_MPSAFE); 231 callout_setfunc(&sc->sc_pcallout, pad_done_output, sc); 232 233 sc->sc_swvol = 255; 234 sc->sc_buflen = 0; 235 sc->sc_rpos = sc->sc_wpos = 0; 236 sc->sc_audiodev = audio_attach_mi(&pad_hw_if, sc, sc->sc_dev); 237 238 if (!pmf_device_register(sc->sc_dev, NULL, NULL)) 239 aprint_error_dev(sc->sc_dev, 240 "couldn't establish power handler\n"); 241 } 242 243 static int 244 pad_detach(device_t self, int flags) 245 { 246 struct pad_softc *sc = device_private(self); 247 int cmaj, mn; 248 int error; 249 250 error = config_detach_children(self, flags); 251 if (error) 252 return error; 253 254 cmaj = cdevsw_lookup_major(&pad_cdevsw); 255 mn = device_unit(sc->sc_dev); 256 vdevgone(cmaj, mn, mn, VCHR); 257 258 pmf_device_deregister(sc->sc_dev); 259 260 mutex_destroy(&sc->sc_lock); 261 mutex_destroy(&sc->sc_intr_lock); 262 cv_destroy(&sc->sc_condvar); 263 264 return 0; 265 } 266 267 static void 268 pad_childdet(device_t self, device_t child) 269 { 270 struct pad_softc *sc = device_private(self); 271 272 if (child == sc->sc_audiodev) 273 sc->sc_audiodev = NULL; 274 } 275 276 static int 277 pad_add_block(struct pad_softc *sc, uint8_t *blk, int blksize) 278 { 279 int l; 280 281 if (sc->sc_buflen + blksize > PAD_BUFSIZE) 282 return ENOBUFS; 283 284 if (sc->sc_wpos + blksize <= PAD_BUFSIZE) 285 memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, blksize); 286 else { 287 l = PAD_BUFSIZE - sc->sc_wpos; 288 memcpy(sc->sc_audiobuf + sc->sc_wpos, blk, l); 289 memcpy(sc->sc_audiobuf, blk + l, blksize - l); 290 } 291 292 sc->sc_wpos += blksize; 293 if (sc->sc_wpos >= PAD_BUFSIZE) 294 sc->sc_wpos -= PAD_BUFSIZE; 295 296 sc->sc_buflen += blksize; 297 298 return 0; 299 } 300 301 static int 302 pad_get_block(struct pad_softc *sc, pad_block_t *pb, int blksize) 303 { 304 int l; 305 306 KASSERT(pb != NULL); 307 308 pb->pb_ptr = (sc->sc_audiobuf + sc->sc_rpos); 309 if (sc->sc_rpos + blksize < PAD_BUFSIZE) { 310 pb->pb_len = blksize; 311 sc->sc_rpos += blksize; 312 } else { 313 l = PAD_BUFSIZE - sc->sc_rpos; 314 pb->pb_len = l; 315 sc->sc_rpos = 0; 316 } 317 sc->sc_buflen -= pb->pb_len; 318 319 return 0; 320 } 321 322 int 323 cdev_pad_open(dev_t dev, int flags, int fmt, struct lwp *l) 324 { 325 struct pad_softc *sc; 326 struct file *fp; 327 device_t paddev; 328 cfdata_t cf; 329 int error, fd, i; 330 331 error = 0; 332 333 mutex_enter(&padconfig); 334 if (PADUNIT(dev) == PADCLONER) { 335 for (i = 0; i < MAXDEVS; i++) { 336 if (device_lookup(&pad_cd, i) == NULL) 337 break; 338 } 339 if (i == MAXDEVS) 340 goto bad; 341 } else { 342 if (PADUNIT(dev) >= MAXDEVS) 343 goto bad; 344 i = PADUNIT(dev); 345 } 346 347 cf = kmem_alloc(sizeof(struct cfdata), KM_SLEEP); 348 cf->cf_name = pad_cd.cd_name; 349 cf->cf_atname = pad_cd.cd_name; 350 cf->cf_unit = i; 351 cf->cf_fstate = FSTATE_STAR; 352 353 bool existing = false; 354 paddev = device_lookup(&pad_cd, minor(dev)); 355 if (paddev == NULL) 356 paddev = config_attach_pseudo(cf); 357 else 358 existing = true; 359 if (paddev == NULL) 360 goto bad; 361 362 sc = device_private(paddev); 363 if (sc == NULL) 364 goto bad; 365 366 if (sc->sc_open == 1) { 367 mutex_exit(&padconfig); 368 return EBUSY; 369 } 370 371 if (PADUNIT(dev) == PADCLONER) { 372 error = fd_allocfile(&fp, &fd); 373 if (error) { 374 if (existing == false) 375 config_detach(paddev, 0); 376 mutex_exit(&padconfig); 377 return error; 378 } 379 error = fd_clone(fp, fd, flags, &pad_fileops, sc); 380 KASSERT(error == EMOVEFD); 381 } 382 sc->sc_open = 1; 383 mutex_exit(&padconfig); 384 385 return error; 386 bad: 387 mutex_exit(&padconfig); 388 return ENXIO; 389 } 390 391 static int 392 pad_close(struct pad_softc *sc) 393 { 394 int rc __diagused; 395 396 /* XXX Defend against concurrent drvctl detach. */ 397 rc = config_detach(sc->sc_dev, DETACH_FORCE); 398 KASSERT(rc == 0); 399 400 return 0; 401 } 402 403 static int 404 fops_pad_close(struct file *fp) 405 { 406 struct pad_softc *sc = fp->f_pad; 407 408 pad_close(sc); 409 fp->f_pad = NULL; 410 411 return 0; 412 } 413 414 int 415 cdev_pad_close(dev_t dev, int flags, int ifmt, struct lwp *l) 416 { 417 struct pad_softc *sc; 418 419 /* 420 * XXX Defend against concurrent drvctl detach. Simply testing 421 * sc == NULL here is not enough -- it could be detached after 422 * we look it up but before we've issued our own config_detach. 423 */ 424 sc = device_lookup_private(&pad_cd, PADUNIT(dev)); 425 if (sc == NULL) 426 return 0; 427 pad_close(sc); 428 429 return 0; 430 } 431 432 static int 433 fops_pad_poll(struct file *fp, int events) 434 { 435 436 return POLLERR; 437 } 438 439 static int 440 fops_pad_kqfilter(struct file *fp, struct knote *kn) 441 { 442 struct pad_softc *sc = fp->f_pad; 443 dev_t dev; 444 445 dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 446 device_unit(sc->sc_dev)); 447 448 return seltrue_kqfilter(dev, kn); 449 } 450 451 static int 452 fops_pad_ioctl(struct file *fp, u_long cmd, void *data) 453 { 454 455 return ENODEV; 456 } 457 458 static int 459 fops_pad_stat(struct file *fp, struct stat *st) 460 { 461 struct pad_softc *sc = fp->f_pad; 462 463 memset(st, 0, sizeof(*st)); 464 465 st->st_dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 466 device_unit(sc->sc_dev)); 467 468 st->st_uid = kauth_cred_geteuid(fp->f_cred); 469 st->st_gid = kauth_cred_getegid(fp->f_cred); 470 st->st_mode = S_IFCHR; 471 472 return 0; 473 } 474 475 static int 476 fops_pad_mmap(struct file *fp, off_t *offp, size_t len, int prot, int *flagsp, 477 int *advicep, struct uvm_object **uobjp, int *maxprotp) 478 { 479 480 return 1; 481 } 482 483 int 484 cdev_pad_read(dev_t dev, struct uio *uio, int ioflag) 485 { 486 struct pad_softc *sc; 487 488 sc = device_private(device_lookup(&pad_cd, PADUNIT(dev))); 489 if (sc == NULL) 490 return ENXIO; 491 492 return pad_read(sc, NULL, uio, NULL, ioflag); 493 } 494 495 static int 496 fops_pad_read(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 497 int ioflag) 498 { 499 struct pad_softc *sc = fp->f_pad; 500 501 return pad_read(sc, offp, uio, cred, ioflag); 502 } 503 504 static int 505 pad_read(struct pad_softc *sc, off_t *offp, struct uio *uio, kauth_cred_t cred, 506 int ioflag) 507 { 508 pad_block_t pb; 509 int len; 510 int err; 511 512 err = 0; 513 DPRINTF("%s: resid=%zu\n", __func__, uio->uio_resid); 514 while (uio->uio_resid > 0 && !err) { 515 mutex_enter(&sc->sc_intr_lock); 516 if (sc->sc_buflen == 0) { 517 DPRINTF("%s: wait\n", __func__); 518 err = cv_wait_sig(&sc->sc_condvar, &sc->sc_intr_lock); 519 DPRINTF("%s: wake up %d\n", __func__, err); 520 mutex_exit(&sc->sc_intr_lock); 521 if (err) { 522 if (err == ERESTART) 523 err = EINTR; 524 break; 525 } 526 if (sc->sc_buflen == 0) 527 break; 528 continue; 529 } 530 531 len = uimin(uio->uio_resid, sc->sc_buflen); 532 err = pad_get_block(sc, &pb, len); 533 mutex_exit(&sc->sc_intr_lock); 534 if (err) 535 break; 536 DPRINTF("%s: move %d\n", __func__, pb.pb_len); 537 uiomove(pb.pb_ptr, pb.pb_len, uio); 538 } 539 540 return err; 541 } 542 543 static int 544 fops_pad_write(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 545 int ioflag) 546 { 547 548 return EOPNOTSUPP; 549 } 550 551 static int 552 pad_query_format(void *opaque, audio_format_query_t *afp) 553 { 554 555 return audio_query_format(pad_formats, PAD_NFORMATS, afp); 556 } 557 558 static int 559 pad_set_format(void *opaque, int setmode, 560 const audio_params_t *play, const audio_params_t *rec, 561 audio_filter_reg_t *pfil, audio_filter_reg_t *rfil) 562 { 563 struct pad_softc *sc = opaque; 564 565 KASSERT(mutex_owned(&sc->sc_lock)); 566 567 /* XXX playback only */ 568 pfil->codec = pad_swvol_codec; 569 pfil->context = sc; 570 571 return 0; 572 } 573 574 static int 575 pad_start_output(void *opaque, void *block, int blksize, 576 void (*intr)(void *), void *intrarg) 577 { 578 struct pad_softc *sc = opaque; 579 int err; 580 int ms; 581 582 KASSERT(mutex_owned(&sc->sc_intr_lock)); 583 584 sc->sc_intr = intr; 585 sc->sc_intrarg = intrarg; 586 sc->sc_blksize = blksize; 587 588 DPRINTF("%s: blksize=%d\n", __func__, blksize); 589 err = pad_add_block(sc, block, blksize); 590 cv_broadcast(&sc->sc_condvar); 591 592 ms = blksize * 1000 / PADCHAN / (PADPREC / NBBY) / PADFREQ; 593 DPRINTF("%s: callout ms=%d\n", __func__, ms); 594 callout_schedule(&sc->sc_pcallout, mstohz(ms)); 595 596 return err; 597 } 598 599 static int 600 pad_halt_output(void *opaque) 601 { 602 struct pad_softc *sc = opaque; 603 604 DPRINTF("%s\n", __func__); 605 KASSERT(mutex_owned(&sc->sc_intr_lock)); 606 607 callout_halt(&sc->sc_pcallout, &sc->sc_intr_lock); 608 609 sc->sc_intr = NULL; 610 sc->sc_intrarg = NULL; 611 sc->sc_buflen = 0; 612 sc->sc_rpos = sc->sc_wpos = 0; 613 cv_broadcast(&sc->sc_condvar); 614 615 return 0; 616 } 617 618 static void 619 pad_done_output(void *arg) 620 { 621 struct pad_softc *sc = arg; 622 623 DPRINTF("%s\n", __func__); 624 625 mutex_enter(&sc->sc_intr_lock); 626 (*sc->sc_intr)(sc->sc_intrarg); 627 mutex_exit(&sc->sc_intr_lock); 628 } 629 630 static int 631 pad_getdev(void *opaque, struct audio_device *ret) 632 { 633 634 strlcpy(ret->name, "Virtual Audio", sizeof(ret->name)); 635 strlcpy(ret->version, osrelease, sizeof(ret->version)); 636 strlcpy(ret->config, "pad", sizeof(ret->config)); 637 638 return 0; 639 } 640 641 static int 642 pad_set_port(void *opaque, mixer_ctrl_t *mc) 643 { 644 struct pad_softc *sc = opaque; 645 646 KASSERT(mutex_owned(&sc->sc_lock)); 647 648 switch (mc->dev) { 649 case PAD_OUTPUT_MASTER_VOLUME: 650 case PAD_INPUT_DAC_VOLUME: 651 if (mc->un.value.num_channels != 1) 652 return EINVAL; 653 sc->sc_swvol = mc->un.value.level[AUDIO_MIXER_LEVEL_MONO]; 654 return 0; 655 } 656 657 return ENXIO; 658 } 659 660 static int 661 pad_get_port(void *opaque, mixer_ctrl_t *mc) 662 { 663 struct pad_softc *sc = opaque; 664 665 KASSERT(mutex_owned(&sc->sc_lock)); 666 667 switch (mc->dev) { 668 case PAD_OUTPUT_MASTER_VOLUME: 669 case PAD_INPUT_DAC_VOLUME: 670 if (mc->un.value.num_channels != 1) 671 return EINVAL; 672 mc->un.value.level[AUDIO_MIXER_LEVEL_MONO] = sc->sc_swvol; 673 return 0; 674 } 675 676 return ENXIO; 677 } 678 679 static int 680 pad_query_devinfo(void *opaque, mixer_devinfo_t *di) 681 { 682 struct pad_softc *sc __diagused = opaque; 683 684 KASSERT(mutex_owned(&sc->sc_lock)); 685 686 switch (di->index) { 687 case PAD_OUTPUT_CLASS: 688 di->mixer_class = PAD_OUTPUT_CLASS; 689 strcpy(di->label.name, AudioCoutputs); 690 di->type = AUDIO_MIXER_CLASS; 691 di->next = di->prev = AUDIO_MIXER_LAST; 692 return 0; 693 case PAD_INPUT_CLASS: 694 di->mixer_class = PAD_INPUT_CLASS; 695 strcpy(di->label.name, AudioCinputs); 696 di->type = AUDIO_MIXER_CLASS; 697 di->next = di->prev = AUDIO_MIXER_LAST; 698 return 0; 699 case PAD_OUTPUT_MASTER_VOLUME: 700 di->mixer_class = PAD_OUTPUT_CLASS; 701 strcpy(di->label.name, AudioNmaster); 702 di->type = AUDIO_MIXER_VALUE; 703 di->next = di->prev = AUDIO_MIXER_LAST; 704 di->un.v.num_channels = 1; 705 strcpy(di->un.v.units.name, AudioNvolume); 706 return 0; 707 case PAD_INPUT_DAC_VOLUME: 708 di->mixer_class = PAD_INPUT_CLASS; 709 strcpy(di->label.name, AudioNdac); 710 di->type = AUDIO_MIXER_VALUE; 711 di->next = di->prev = AUDIO_MIXER_LAST; 712 di->un.v.num_channels = 1; 713 strcpy(di->un.v.units.name, AudioNvolume); 714 return 0; 715 } 716 717 return ENXIO; 718 } 719 720 static int 721 pad_get_props(void *opaque) 722 { 723 724 return AUDIO_PROP_PLAYBACK; 725 } 726 727 static void 728 pad_get_locks(void *opaque, kmutex_t **intr, kmutex_t **thread) 729 { 730 struct pad_softc *sc = opaque; 731 732 *intr = &sc->sc_intr_lock; 733 *thread = &sc->sc_lock; 734 } 735 736 static void 737 pad_swvol_codec(audio_filter_arg_t *arg) 738 { 739 struct pad_softc *sc = arg->context; 740 const aint_t *src; 741 aint_t *dst; 742 u_int sample_count; 743 u_int i; 744 745 src = arg->src; 746 dst = arg->dst; 747 sample_count = arg->count * arg->srcfmt->channels; 748 for (i = 0; i < sample_count; i++) { 749 aint2_t v = (aint2_t)(*src++); 750 v = v * sc->sc_swvol / 255; 751 *dst++ = (aint_t)v; 752 } 753 } 754 755 MODULE(MODULE_CLASS_DRIVER, pad, "audio"); 756 757 #ifdef _MODULE 758 759 #include "ioconf.c" 760 761 devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR; 762 763 /* 764 * We need our own version of cfattach since config(1)'s ioconf does not 765 * generate what we need 766 */ 767 768 static struct cfattach *pad_cfattachinit[] = { &pad_ca, NULL }; 769 770 static struct cfattachinit pad_cfattach[] = { 771 { "pad", pad_cfattachinit }, 772 { NULL, NULL } 773 }; 774 #endif 775 776 static int 777 pad_modcmd(modcmd_t cmd, void *arg) 778 { 779 int error = 0; 780 781 switch (cmd) { 782 case MODULE_CMD_INIT: 783 #ifdef _MODULE 784 pad_cfattach[1] = cfattach_ioconf_pad[0]; 785 error = config_init_component(cfdriver_ioconf_pad, 786 pad_cfattach, cfdata_ioconf_pad); 787 if (error) 788 break; 789 790 error = devsw_attach(pad_cd.cd_name, NULL, &bmajor, 791 &pad_cdevsw, &cmajor); 792 if (error) { 793 config_fini_component(cfdriver_ioconf_pad, 794 pad_cfattach, cfdata_ioconf_pad); 795 break; 796 } 797 mutex_init(&padconfig, MUTEX_DEFAULT, IPL_NONE); 798 799 #endif 800 break; 801 802 case MODULE_CMD_FINI: 803 #ifdef _MODULE 804 error = devsw_detach(NULL, &pad_cdevsw); 805 if (error) 806 break; 807 808 error = config_fini_component(cfdriver_ioconf_pad, 809 pad_cfattach, cfdata_ioconf_pad); 810 if (error) { 811 devsw_attach(pad_cd.cd_name, NULL, &bmajor, 812 &pad_cdevsw, &cmajor); 813 break; 814 } 815 mutex_destroy(&padconfig); 816 #endif 817 break; 818 819 default: 820 error = ENOTTY; 821 } 822 823 return error; 824 } 825
Indexes created Thu Oct 02 10:09:58 GMT 2025