pad.c revision 1.70
1 /* $NetBSD: pad.c,v 1.70 2021/06/14 10:14:46 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 1.70 2021/06/14 10:14:46 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 /* #define PAD_DEBUG */ 58 #ifdef PAD_DEBUG 59 #define DPRINTF(fmt...) printf(fmt) 60 #else 61 #define DPRINTF(fmt...) /**/ 62 #endif 63 64 #define MAXDEVS 128 65 #define PADCLONER 254 66 #define PADUNIT(x) minor(x) 67 68 #define PADFREQ 44100 69 #define PADCHAN 2 70 #define PADPREC 16 71 72 extern struct cfdriver pad_cd; 73 kmutex_t padconfig; 74 75 typedef struct pad_block { 76 uint8_t *pb_ptr; 77 int pb_len; 78 } pad_block_t; 79 80 enum { 81 PAD_OUTPUT_CLASS, 82 PAD_INPUT_CLASS, 83 PAD_OUTPUT_MASTER_VOLUME, 84 PAD_INPUT_DAC_VOLUME, 85 PAD_ENUM_LAST, 86 }; 87 88 static int pad_match(device_t, cfdata_t, void *); 89 static void pad_attach(device_t, device_t, void *); 90 static int pad_detach(device_t, int); 91 static void pad_childdet(device_t, device_t); 92 93 static int pad_query_format(void *, audio_format_query_t *); 94 static int pad_set_format(void *, int, 95 const audio_params_t *, const audio_params_t *, 96 audio_filter_reg_t *, audio_filter_reg_t *); 97 static int pad_start_output(void *, void *, int, 98 void (*)(void *), void *); 99 static int pad_halt_output(void *); 100 static int pad_getdev(void *, struct audio_device *); 101 static int pad_set_port(void *, mixer_ctrl_t *); 102 static int pad_get_port(void *, mixer_ctrl_t *); 103 static int pad_query_devinfo(void *, mixer_devinfo_t *); 104 static int pad_get_props(void *); 105 static void pad_get_locks(void *, kmutex_t **, kmutex_t **); 106 107 static void pad_done_output(void *); 108 static void pad_swvol_codec(audio_filter_arg_t *); 109 110 static int pad_close(struct pad_softc *); 111 static int pad_read(struct pad_softc *, off_t *, struct uio *, 112 kauth_cred_t, int); 113 114 static int fops_pad_close(struct file *); 115 static int fops_pad_read(struct file *, off_t *, struct uio *, 116 kauth_cred_t, int); 117 static int fops_pad_write(struct file *, off_t *, struct uio *, 118 kauth_cred_t, int); 119 static int fops_pad_ioctl(struct file *, u_long, void *); 120 static int fops_pad_kqfilter(struct file *, struct knote *); 121 static int fops_pad_poll(struct file *, int); 122 static int fops_pad_stat(struct file *, struct stat *); 123 static int fops_pad_mmap(struct file *, off_t *, size_t, int, int *, int *, 124 struct uvm_object **, int *); 125 126 static const struct audio_hw_if pad_hw_if = { 127 .query_format = pad_query_format, 128 .set_format = pad_set_format, 129 .start_output = pad_start_output, 130 .halt_output = pad_halt_output, 131 .getdev = pad_getdev, 132 .set_port = pad_set_port, 133 .get_port = pad_get_port, 134 .query_devinfo = pad_query_devinfo, 135 .get_props = pad_get_props, 136 .get_locks = pad_get_locks, 137 }; 138 139 #define PAD_NFORMATS 1 140 static const struct audio_format pad_formats[PAD_NFORMATS] = { 141 { 142 .mode = AUMODE_PLAY, 143 .encoding = AUDIO_ENCODING_SLINEAR_LE, 144 .validbits = PADPREC, 145 .precision = PADPREC, 146 .channels = PADCHAN, 147 .channel_mask = AUFMT_STEREO, 148 .frequency_type = 1, 149 .frequency = { PADFREQ }, 150 }, 151 }; 152 153 extern void padattach(int); 154 155 static int pad_add_block(struct pad_softc *, uint8_t *, int); 156 static int pad_get_block(struct pad_softc *, pad_block_t *, int); 157 158 dev_type_open(cdev_pad_open); 159 dev_type_close(cdev_pad_close); 160 dev_type_read(cdev_pad_read); 161 162 const struct cdevsw pad_cdevsw = { 163 .d_open = cdev_pad_open, 164 .d_close = cdev_pad_close, 165 .d_read = cdev_pad_read, 166 .d_write = nowrite, 167 .d_ioctl = noioctl, 168 .d_stop = nostop, 169 .d_tty = notty, 170 .d_poll = nopoll, 171 .d_mmap = nommap, 172 .d_kqfilter = nokqfilter, 173 .d_discard = nodiscard, 174 .d_flag = D_OTHER | D_MPSAFE, 175 }; 176 177 const struct fileops pad_fileops = { 178 .fo_name = "pad", 179 .fo_read = fops_pad_read, 180 .fo_write = fops_pad_write, 181 .fo_ioctl = fops_pad_ioctl, 182 .fo_fcntl = fnullop_fcntl, 183 .fo_stat = fops_pad_stat, 184 .fo_poll = fops_pad_poll, 185 .fo_close = fops_pad_close, 186 .fo_mmap = fops_pad_mmap, 187 .fo_kqfilter = fops_pad_kqfilter, 188 .fo_restart = fnullop_restart 189 }; 190 191 CFATTACH_DECL2_NEW(pad, sizeof(struct pad_softc), 192 pad_match, pad_attach, pad_detach, 193 NULL, NULL, pad_childdet); 194 195 void 196 padattach(int n) 197 { 198 int error; 199 200 error = config_cfattach_attach(pad_cd.cd_name, &pad_ca); 201 if (error) { 202 aprint_error("%s: couldn't register cfattach: %d\n", 203 pad_cd.cd_name, error); 204 config_cfdriver_detach(&pad_cd); 205 return; 206 } 207 mutex_init(&padconfig, MUTEX_DEFAULT, IPL_NONE); 208 209 return; 210 } 211 212 static int 213 pad_match(device_t parent, cfdata_t data, void *opaque) 214 { 215 216 return 1; 217 } 218 219 static void 220 pad_attach(device_t parent, device_t self, void *opaque) 221 { 222 struct pad_softc *sc = device_private(self); 223 224 aprint_normal_dev(self, "outputs: 44100Hz, 16-bit, stereo\n"); 225 226 sc->sc_dev = self; 227 228 cv_init(&sc->sc_condvar, device_xname(sc->sc_dev)); 229 mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_NONE); 230 mutex_init(&sc->sc_intr_lock, MUTEX_DEFAULT, IPL_SOFTCLOCK); 231 callout_init(&sc->sc_pcallout, CALLOUT_MPSAFE); 232 callout_setfunc(&sc->sc_pcallout, pad_done_output, sc); 233 234 sc->sc_swvol = 255; 235 sc->sc_buflen = 0; 236 sc->sc_rpos = sc->sc_wpos = 0; 237 sc->sc_audiodev = audio_attach_mi(&pad_hw_if, sc, sc->sc_dev); 238 239 if (!pmf_device_register(sc->sc_dev, NULL, NULL)) 240 aprint_error_dev(sc->sc_dev, 241 "couldn't establish power handler\n"); 242 } 243 244 static int 245 pad_detach(device_t self, int flags) 246 { 247 struct pad_softc *sc = device_private(self); 248 int cmaj, mn; 249 int error; 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 int 324 cdev_pad_open(dev_t dev, int flags, int fmt, struct lwp *l) 325 { 326 struct pad_softc *sc; 327 struct file *fp; 328 device_t paddev; 329 cfdata_t cf; 330 int error, fd, i; 331 332 error = 0; 333 334 mutex_enter(&padconfig); 335 if (PADUNIT(dev) == PADCLONER) { 336 for (i = 0; i < MAXDEVS; i++) { 337 if (device_lookup(&pad_cd, i) == NULL) 338 break; 339 } 340 if (i == MAXDEVS) 341 goto bad; 342 } else { 343 if (PADUNIT(dev) >= MAXDEVS) 344 goto bad; 345 i = PADUNIT(dev); 346 } 347 348 cf = kmem_alloc(sizeof(struct cfdata), KM_SLEEP); 349 cf->cf_name = pad_cd.cd_name; 350 cf->cf_atname = pad_cd.cd_name; 351 cf->cf_unit = i; 352 cf->cf_fstate = FSTATE_STAR; 353 354 bool existing = false; 355 paddev = device_lookup(&pad_cd, minor(dev)); 356 if (paddev == NULL) 357 paddev = config_attach_pseudo(cf); 358 else 359 existing = true; 360 if (paddev == NULL) 361 goto bad; 362 363 sc = device_private(paddev); 364 if (sc == NULL) 365 goto bad; 366 367 if (sc->sc_open == 1) { 368 mutex_exit(&padconfig); 369 return EBUSY; 370 } 371 372 if (PADUNIT(dev) == PADCLONER) { 373 error = fd_allocfile(&fp, &fd); 374 if (error) { 375 if (existing == false) 376 config_detach(paddev, 0); 377 mutex_exit(&padconfig); 378 return error; 379 } 380 error = fd_clone(fp, fd, flags, &pad_fileops, sc); 381 KASSERT(error == EMOVEFD); 382 } 383 sc->sc_open = 1; 384 mutex_exit(&padconfig); 385 386 return error; 387 bad: 388 mutex_exit(&padconfig); 389 return ENXIO; 390 } 391 392 static int 393 pad_close(struct pad_softc *sc) 394 { 395 int rc __diagused; 396 397 /* XXX Defend against concurrent drvctl detach. */ 398 rc = config_detach(sc->sc_dev, DETACH_FORCE); 399 KASSERT(rc == 0); 400 401 return 0; 402 } 403 404 static int 405 fops_pad_close(struct file *fp) 406 { 407 struct pad_softc *sc = fp->f_pad; 408 409 pad_close(sc); 410 fp->f_pad = NULL; 411 412 return 0; 413 } 414 415 int 416 cdev_pad_close(dev_t dev, int flags, int ifmt, struct lwp *l) 417 { 418 struct pad_softc *sc; 419 420 /* 421 * XXX Defend against concurrent drvctl detach. Simply testing 422 * sc == NULL here is not enough -- it could be detached after 423 * we look it up but before we've issued our own config_detach. 424 */ 425 sc = device_lookup_private(&pad_cd, PADUNIT(dev)); 426 if (sc == NULL) 427 return 0; 428 pad_close(sc); 429 430 return 0; 431 } 432 433 static int 434 fops_pad_poll(struct file *fp, int events) 435 { 436 437 return POLLERR; 438 } 439 440 static int 441 fops_pad_kqfilter(struct file *fp, struct knote *kn) 442 { 443 struct pad_softc *sc = fp->f_pad; 444 dev_t dev; 445 446 dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 447 device_unit(sc->sc_dev)); 448 449 return seltrue_kqfilter(dev, kn); 450 } 451 452 static int 453 fops_pad_ioctl(struct file *fp, u_long cmd, void *data) 454 { 455 456 return ENODEV; 457 } 458 459 static int 460 fops_pad_stat(struct file *fp, struct stat *st) 461 { 462 struct pad_softc *sc = fp->f_pad; 463 464 memset(st, 0, sizeof(*st)); 465 466 st->st_dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 467 device_unit(sc->sc_dev)); 468 469 st->st_uid = kauth_cred_geteuid(fp->f_cred); 470 st->st_gid = kauth_cred_getegid(fp->f_cred); 471 st->st_mode = S_IFCHR; 472 473 return 0; 474 } 475 476 static int 477 fops_pad_mmap(struct file *fp, off_t *offp, size_t len, int prot, int *flagsp, 478 int *advicep, struct uvm_object **uobjp, int *maxprotp) 479 { 480 481 return 1; 482 } 483 484 int 485 cdev_pad_read(dev_t dev, struct uio *uio, int ioflag) 486 { 487 struct pad_softc *sc; 488 489 sc = device_private(device_lookup(&pad_cd, PADUNIT(dev))); 490 if (sc == NULL) 491 return ENXIO; 492 493 return pad_read(sc, NULL, uio, NULL, ioflag); 494 } 495 496 static int 497 fops_pad_read(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 498 int ioflag) 499 { 500 struct pad_softc *sc = fp->f_pad; 501 502 return pad_read(sc, offp, uio, cred, ioflag); 503 } 504 505 static int 506 pad_read(struct pad_softc *sc, off_t *offp, struct uio *uio, kauth_cred_t cred, 507 int ioflag) 508 { 509 pad_block_t pb; 510 int len; 511 int err; 512 513 err = 0; 514 DPRINTF("%s: resid=%zu\n", __func__, uio->uio_resid); 515 while (uio->uio_resid > 0 && !err) { 516 mutex_enter(&sc->sc_intr_lock); 517 if (sc->sc_buflen == 0) { 518 DPRINTF("%s: wait\n", __func__); 519 err = cv_wait_sig(&sc->sc_condvar, &sc->sc_intr_lock); 520 DPRINTF("%s: wake up %d\n", __func__, err); 521 mutex_exit(&sc->sc_intr_lock); 522 if (err) { 523 if (err == ERESTART) 524 err = EINTR; 525 break; 526 } 527 if (sc->sc_buflen == 0) 528 break; 529 continue; 530 } 531 532 len = uimin(uio->uio_resid, sc->sc_buflen); 533 err = pad_get_block(sc, &pb, len); 534 mutex_exit(&sc->sc_intr_lock); 535 if (err) 536 break; 537 DPRINTF("%s: move %d\n", __func__, pb.pb_len); 538 uiomove(pb.pb_ptr, pb.pb_len, uio); 539 } 540 541 return err; 542 } 543 544 static int 545 fops_pad_write(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 546 int ioflag) 547 { 548 549 return EOPNOTSUPP; 550 } 551 552 static int 553 pad_query_format(void *opaque, audio_format_query_t *afp) 554 { 555 556 return audio_query_format(pad_formats, PAD_NFORMATS, afp); 557 } 558 559 static int 560 pad_set_format(void *opaque, int setmode, 561 const audio_params_t *play, const audio_params_t *rec, 562 audio_filter_reg_t *pfil, audio_filter_reg_t *rfil) 563 { 564 struct pad_softc *sc = opaque; 565 566 KASSERT(mutex_owned(&sc->sc_lock)); 567 568 /* XXX playback only */ 569 pfil->codec = pad_swvol_codec; 570 pfil->context = sc; 571 572 return 0; 573 } 574 575 static int 576 pad_start_output(void *opaque, void *block, int blksize, 577 void (*intr)(void *), void *intrarg) 578 { 579 struct pad_softc *sc = opaque; 580 int err; 581 int ms; 582 583 KASSERT(mutex_owned(&sc->sc_intr_lock)); 584 585 sc->sc_intr = intr; 586 sc->sc_intrarg = intrarg; 587 sc->sc_blksize = blksize; 588 589 DPRINTF("%s: blksize=%d\n", __func__, blksize); 590 err = pad_add_block(sc, block, blksize); 591 cv_broadcast(&sc->sc_condvar); 592 593 ms = blksize * 1000 / PADCHAN / (PADPREC / NBBY) / PADFREQ; 594 DPRINTF("%s: callout ms=%d\n", __func__, ms); 595 callout_schedule(&sc->sc_pcallout, mstohz(ms)); 596 597 return err; 598 } 599 600 static int 601 pad_halt_output(void *opaque) 602 { 603 struct pad_softc *sc = opaque; 604 605 DPRINTF("%s\n", __func__); 606 KASSERT(mutex_owned(&sc->sc_intr_lock)); 607 608 callout_halt(&sc->sc_pcallout, &sc->sc_intr_lock); 609 610 sc->sc_intr = NULL; 611 sc->sc_intrarg = NULL; 612 sc->sc_buflen = 0; 613 sc->sc_rpos = sc->sc_wpos = 0; 614 cv_broadcast(&sc->sc_condvar); 615 616 return 0; 617 } 618 619 static void 620 pad_done_output(void *arg) 621 { 622 struct pad_softc *sc = arg; 623 624 DPRINTF("%s\n", __func__); 625 626 mutex_enter(&sc->sc_intr_lock); 627 (*sc->sc_intr)(sc->sc_intrarg); 628 mutex_exit(&sc->sc_intr_lock); 629 } 630 631 static int 632 pad_getdev(void *opaque, struct audio_device *ret) 633 { 634 635 strlcpy(ret->name, "Virtual Audio", sizeof(ret->name)); 636 strlcpy(ret->version, osrelease, sizeof(ret->version)); 637 strlcpy(ret->config, "pad", sizeof(ret->config)); 638 639 return 0; 640 } 641 642 static int 643 pad_set_port(void *opaque, mixer_ctrl_t *mc) 644 { 645 struct pad_softc *sc = opaque; 646 647 KASSERT(mutex_owned(&sc->sc_lock)); 648 649 switch (mc->dev) { 650 case PAD_OUTPUT_MASTER_VOLUME: 651 case PAD_INPUT_DAC_VOLUME: 652 if (mc->un.value.num_channels != 1) 653 return EINVAL; 654 sc->sc_swvol = mc->un.value.level[AUDIO_MIXER_LEVEL_MONO]; 655 return 0; 656 } 657 658 return ENXIO; 659 } 660 661 static int 662 pad_get_port(void *opaque, mixer_ctrl_t *mc) 663 { 664 struct pad_softc *sc = opaque; 665 666 KASSERT(mutex_owned(&sc->sc_lock)); 667 668 switch (mc->dev) { 669 case PAD_OUTPUT_MASTER_VOLUME: 670 case PAD_INPUT_DAC_VOLUME: 671 if (mc->un.value.num_channels != 1) 672 return EINVAL; 673 mc->un.value.level[AUDIO_MIXER_LEVEL_MONO] = sc->sc_swvol; 674 return 0; 675 } 676 677 return ENXIO; 678 } 679 680 static int 681 pad_query_devinfo(void *opaque, mixer_devinfo_t *di) 682 { 683 struct pad_softc *sc __diagused = opaque; 684 685 KASSERT(mutex_owned(&sc->sc_lock)); 686 687 switch (di->index) { 688 case PAD_OUTPUT_CLASS: 689 di->mixer_class = PAD_OUTPUT_CLASS; 690 strcpy(di->label.name, AudioCoutputs); 691 di->type = AUDIO_MIXER_CLASS; 692 di->next = di->prev = AUDIO_MIXER_LAST; 693 return 0; 694 case PAD_INPUT_CLASS: 695 di->mixer_class = PAD_INPUT_CLASS; 696 strcpy(di->label.name, AudioCinputs); 697 di->type = AUDIO_MIXER_CLASS; 698 di->next = di->prev = AUDIO_MIXER_LAST; 699 return 0; 700 case PAD_OUTPUT_MASTER_VOLUME: 701 di->mixer_class = PAD_OUTPUT_CLASS; 702 strcpy(di->label.name, AudioNmaster); 703 di->type = AUDIO_MIXER_VALUE; 704 di->next = di->prev = AUDIO_MIXER_LAST; 705 di->un.v.num_channels = 1; 706 strcpy(di->un.v.units.name, AudioNvolume); 707 return 0; 708 case PAD_INPUT_DAC_VOLUME: 709 di->mixer_class = PAD_INPUT_CLASS; 710 strcpy(di->label.name, AudioNdac); 711 di->type = AUDIO_MIXER_VALUE; 712 di->next = di->prev = AUDIO_MIXER_LAST; 713 di->un.v.num_channels = 1; 714 strcpy(di->un.v.units.name, AudioNvolume); 715 return 0; 716 } 717 718 return ENXIO; 719 } 720 721 static int 722 pad_get_props(void *opaque) 723 { 724 725 return AUDIO_PROP_PLAYBACK; 726 } 727 728 static void 729 pad_get_locks(void *opaque, kmutex_t **intr, kmutex_t **thread) 730 { 731 struct pad_softc *sc = opaque; 732 733 *intr = &sc->sc_intr_lock; 734 *thread = &sc->sc_lock; 735 } 736 737 static void 738 pad_swvol_codec(audio_filter_arg_t *arg) 739 { 740 struct pad_softc *sc = arg->context; 741 const aint_t *src; 742 aint_t *dst; 743 u_int sample_count; 744 u_int i; 745 746 src = arg->src; 747 dst = arg->dst; 748 sample_count = arg->count * arg->srcfmt->channels; 749 for (i = 0; i < sample_count; i++) { 750 aint2_t v = (aint2_t)(*src++); 751 v = v * sc->sc_swvol / 255; 752 *dst++ = (aint_t)v; 753 } 754 } 755 756 MODULE(MODULE_CLASS_DRIVER, pad, "audio"); 757 758 #ifdef _MODULE 759 760 #include "ioconf.c" 761 762 devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR; 763 764 /* 765 * We need our own version of cfattach since config(1)'s ioconf does not 766 * generate what we need 767 */ 768 769 static struct cfattach *pad_cfattachinit[] = { &pad_ca, NULL }; 770 771 static struct cfattachinit pad_cfattach[] = { 772 { "pad", pad_cfattachinit }, 773 { NULL, NULL } 774 }; 775 #endif 776 777 static int 778 pad_modcmd(modcmd_t cmd, void *arg) 779 { 780 int error = 0; 781 782 switch (cmd) { 783 case MODULE_CMD_INIT: 784 #ifdef _MODULE 785 pad_cfattach[1] = cfattach_ioconf_pad[0]; 786 error = config_init_component(cfdriver_ioconf_pad, 787 pad_cfattach, cfdata_ioconf_pad); 788 if (error) 789 break; 790 791 error = devsw_attach(pad_cd.cd_name, NULL, &bmajor, 792 &pad_cdevsw, &cmajor); 793 if (error) { 794 config_fini_component(cfdriver_ioconf_pad, 795 pad_cfattach, cfdata_ioconf_pad); 796 break; 797 } 798 mutex_init(&padconfig, MUTEX_DEFAULT, IPL_NONE); 799 800 #endif 801 break; 802 803 case MODULE_CMD_FINI: 804 #ifdef _MODULE 805 error = devsw_detach(NULL, &pad_cdevsw); 806 if (error) 807 break; 808 809 error = config_fini_component(cfdriver_ioconf_pad, 810 pad_cfattach, cfdata_ioconf_pad); 811 if (error) { 812 devsw_attach(pad_cd.cd_name, NULL, &bmajor, 813 &pad_cdevsw, &cmajor); 814 break; 815 } 816 mutex_destroy(&padconfig); 817 #endif 818 break; 819 820 default: 821 error = ENOTTY; 822 } 823 824 return error; 825 } 826
Indexes created Thu Oct 02 10:09:58 GMT 2025