1 /* $NetBSD: pad.c,v 1.85 2023/05/27 14:51:47 nat Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 Jared D. McNeill <jmcneill@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 1.85 2023/05/27 14:51:47 nat 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, 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 foff, flen, tlen; 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 foff = sc->sc_wpos; 293 if (sc->sc_wpos + blksize <= PAD_BUFSIZE) { 294 flen = blksize; 295 tlen = 0; 296 } else { 297 flen = PAD_BUFSIZE - sc->sc_wpos; 298 tlen = blksize - flen; 299 } 300 301 sc->sc_wpos = foff + blksize; 302 if (sc->sc_wpos >= PAD_BUFSIZE) 303 sc->sc_wpos -= PAD_BUFSIZE; 304 305 /* 306 * release interrupt lock for bulk copy to audio buffer 307 */ 308 mutex_exit(&sc->sc_intr_lock); 309 memcpy(sc->sc_audiobuf + foff, blk, flen); 310 memcpy(sc->sc_audiobuf, blk + flen, tlen); 311 mutex_enter(&sc->sc_intr_lock); 312 313 sc->sc_buflen += blksize; 314 cv_broadcast(&sc->sc_condvar); 315 316 return 0; 317 } 318 319 static int 320 pad_get_block(struct pad_softc *sc, pad_block_t *pb, int maxblksize, int dowait) 321 { 322 int l, blksize, error; 323 324 KASSERT(maxblksize > 0); 325 KASSERT(mutex_owned(&sc->sc_intr_lock)); 326 327 if (sc->sc_buflen == 0 && !dowait) 328 return EAGAIN; 329 330 while (sc->sc_buflen == 0) { 331 DPRINTF("%s: wait\n", __func__); 332 error = cv_wait_sig(&sc->sc_condvar, &sc->sc_intr_lock); 333 DPRINTF("%s: wake up %d\n", __func__, err); 334 if (error) 335 return error; 336 } 337 blksize = uimin(maxblksize, sc->sc_buflen); 338 339 pb->pb_ptr = (sc->sc_audiobuf + sc->sc_rpos); 340 if (sc->sc_rpos + blksize < PAD_BUFSIZE) { 341 pb->pb_len = blksize; 342 sc->sc_rpos += blksize; 343 } else { 344 l = PAD_BUFSIZE - sc->sc_rpos; 345 pb->pb_len = l; 346 sc->sc_rpos = 0; 347 } 348 sc->sc_buflen -= pb->pb_len; 349 350 return 0; 351 } 352 353 static int 354 pad_open(dev_t dev, int flags, int fmt, struct lwp *l) 355 { 356 struct file *fp = NULL; 357 device_t self; 358 struct pad_softc *sc = NULL; 359 cfdata_t cf = NULL; 360 int error, fd; 361 362 error = fd_allocfile(&fp, &fd); 363 if (error) 364 goto out; 365 366 cf = kmem_alloc(sizeof(*cf), KM_SLEEP); 367 cf->cf_name = pad_cd.cd_name; 368 cf->cf_atname = pad_cd.cd_name; 369 cf->cf_unit = 0; 370 cf->cf_fstate = FSTATE_STAR; 371 372 self = config_attach_pseudo(cf); 373 if (self == NULL) { 374 error = ENXIO; 375 goto out; 376 } 377 sc = device_private(self); 378 KASSERT(sc->sc_dev == self); 379 cf = NULL; 380 381 error = fd_clone(fp, fd, flags, &pad_fileops, sc); 382 KASSERT(error == EMOVEFD); 383 fp = NULL; 384 sc = NULL; 385 386 out: if (sc) 387 pad_close(sc); 388 if (cf) 389 kmem_free(cf, sizeof(*cf)); 390 if (fp) 391 fd_abort(curproc, fp, fd); 392 return error; 393 } 394 395 static void 396 pad_close(struct pad_softc *sc) 397 { 398 device_t self = sc->sc_dev; 399 cfdata_t cf = device_cfdata(self); 400 401 /* 402 * XXX This is not quite enough to prevent racing with drvctl 403 * detach. What can happen: 404 * 405 * cpu0 cpu1 406 * 407 * pad_close 408 * take kernel lock 409 * sc->sc_open = 0 410 * drop kernel lock 411 * wait for config_misc_lock 412 * drvctl detach 413 * take kernel lock 414 * drop kernel lock 415 * wait for config_misc_lock 416 * retake kernel lock 417 * drop config_misc_lock 418 * take config_misc_lock 419 * wait for kernel lock 420 * pad_detach (sc_open=0 already) 421 * free device 422 * drop kernel lock 423 * use device after free 424 * 425 * We need a way to grab a reference to the device so it won't 426 * be freed until we're done -- it's OK if we config_detach 427 * twice as long as it's idempotent, but not OK if the first 428 * config_detach frees the struct device before the second one 429 * has finished handling it. 430 */ 431 KERNEL_LOCK(1, NULL); 432 KASSERT(sc->sc_open); 433 sc->sc_open = 0; 434 (void)config_detach(self, DETACH_FORCE); 435 KERNEL_UNLOCK_ONE(NULL); 436 437 kmem_free(cf, sizeof(*cf)); 438 } 439 440 static int 441 fops_pad_close(struct file *fp) 442 { 443 struct pad_softc *sc = fp->f_pad; 444 445 pad_close(sc); 446 447 return 0; 448 } 449 450 static int 451 fops_pad_poll(struct file *fp, int events) 452 { 453 454 return POLLERR; 455 } 456 457 static int 458 fops_pad_kqfilter(struct file *fp, struct knote *kn) 459 { 460 struct pad_softc *sc = fp->f_pad; 461 dev_t dev; 462 463 dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 464 device_unit(sc->sc_dev)); 465 466 return seltrue_kqfilter(dev, kn); 467 } 468 469 static int 470 fops_pad_ioctl(struct file *fp, u_long cmd, void *data) 471 { 472 473 return ENODEV; 474 } 475 476 static int 477 fops_pad_stat(struct file *fp, struct stat *st) 478 { 479 struct pad_softc *sc = fp->f_pad; 480 481 memset(st, 0, sizeof(*st)); 482 483 st->st_dev = makedev(cdevsw_lookup_major(&pad_cdevsw), 484 device_unit(sc->sc_dev)); 485 486 st->st_uid = kauth_cred_geteuid(fp->f_cred); 487 st->st_gid = kauth_cred_getegid(fp->f_cred); 488 st->st_mode = S_IFCHR; 489 490 return 0; 491 } 492 493 static int 494 fops_pad_mmap(struct file *fp, off_t *offp, size_t len, int prot, int *flagsp, 495 int *advicep, struct uvm_object **uobjp, int *maxprotp) 496 { 497 498 return 1; 499 } 500 501 static int 502 fops_pad_read(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 503 int ioflag) 504 { 505 struct pad_softc *sc = fp->f_pad; 506 507 return pad_read(sc, offp, uio, cred, ioflag); 508 } 509 510 static int 511 pad_read(struct pad_softc *sc, off_t *offp, struct uio *uio, kauth_cred_t cred, 512 int ioflag) 513 { 514 pad_block_t pb; 515 int err, first; 516 517 err = 0; 518 first = 1; 519 DPRINTF("%s: resid=%zu\n", __func__, uio->uio_resid); 520 while (uio->uio_resid > 0) { 521 mutex_enter(&sc->sc_intr_lock); 522 err = pad_get_block(sc, &pb, MIN(uio->uio_resid, INT_MAX), first); 523 mutex_exit(&sc->sc_intr_lock); 524 first = 0; 525 if (err == EAGAIN) { 526 err = 0; 527 break; 528 } 529 if (err) 530 break; 531 532 DPRINTF("%s: move %d\n", __func__, pb.pb_len); 533 err = uiomove(pb.pb_ptr, pb.pb_len, uio); 534 if (err) 535 break; 536 } 537 538 return err; 539 } 540 541 static int 542 fops_pad_write(struct file *fp, off_t *offp, struct uio *uio, kauth_cred_t cred, 543 int ioflag) 544 { 545 546 return EOPNOTSUPP; 547 } 548 549 static int 550 pad_query_format(void *opaque, audio_format_query_t *afp) 551 { 552 553 return audio_query_format(pad_formats, PAD_NFORMATS, afp); 554 } 555 556 static int 557 pad_set_format(void *opaque, int setmode, 558 const audio_params_t *play, const audio_params_t *rec, 559 audio_filter_reg_t *pfil, audio_filter_reg_t *rfil) 560 { 561 struct pad_softc *sc = opaque; 562 563 KASSERT(mutex_owned(&sc->sc_lock)); 564 565 /* XXX playback only */ 566 pfil->codec = pad_swvol_codec; 567 pfil->context = sc; 568 569 return 0; 570 } 571 572 static int 573 pad_start_output(void *opaque, void *block, int blksize, 574 void (*intr)(void *), void *intrarg) 575 { 576 struct pad_softc *sc = opaque; 577 int err; 578 u_int framesize; 579 int ticks; 580 581 KASSERT(mutex_owned(&sc->sc_intr_lock)); 582 583 sc->sc_intr = intr; 584 sc->sc_intrarg = intrarg; 585 586 DPRINTF("%s: blksize=%d\n", __func__, blksize); 587 err = pad_add_block(sc, block, blksize); 588 if (err) { 589 DPRINTF("%s: failed: %d\n", __func__, err); 590 /* "Silently" drop overflows, but keep pace */ 591 err = 0; 592 } 593 594 framesize = PADCHAN * (PADPREC / NBBY) * PADFREQ; 595 596 sc->sc_resid += blksize; 597 ticks = mstohz(sc->sc_resid * 1000 / framesize); 598 sc->sc_resid -= hztoms(ticks) * framesize / 1000; 599 600 DPRINTF("%s: callout ms=%d\n", __func__, ms); 601 callout_schedule(&sc->sc_pcallout, ticks); 602 603 return err; 604 } 605 606 static int 607 pad_halt_output(void *opaque) 608 { 609 struct pad_softc *sc = opaque; 610 611 DPRINTF("%s\n", __func__); 612 KASSERT(mutex_owned(&sc->sc_intr_lock)); 613 614 callout_halt(&sc->sc_pcallout, &sc->sc_intr_lock); 615 616 sc->sc_intr = NULL; 617 sc->sc_intrarg = NULL; 618 sc->sc_buflen = 0; 619 sc->sc_resid = 0; 620 sc->sc_rpos = sc->sc_wpos = 0; 621 622 return 0; 623 } 624 625 static void 626 pad_done_output(void *arg) 627 { 628 struct pad_softc *sc = arg; 629 630 DPRINTF("%s\n", __func__); 631 632 mutex_enter(&sc->sc_intr_lock); 633 (*sc->sc_intr)(sc->sc_intrarg); 634 mutex_exit(&sc->sc_intr_lock); 635 } 636 637 static int 638 pad_getdev(void *opaque, struct audio_device *ret) 639 { 640 641 strlcpy(ret->name, "Virtual Audio", sizeof(ret->name)); 642 strlcpy(ret->version, osrelease, sizeof(ret->version)); 643 strlcpy(ret->config, "pad", sizeof(ret->config)); 644 645 return 0; 646 } 647 648 static int 649 pad_set_port(void *opaque, mixer_ctrl_t *mc) 650 { 651 struct pad_softc *sc = opaque; 652 653 KASSERT(mutex_owned(&sc->sc_lock)); 654 655 switch (mc->dev) { 656 case PAD_OUTPUT_MASTER_VOLUME: 657 case PAD_INPUT_DAC_VOLUME: 658 if (mc->un.value.num_channels != 1) 659 return EINVAL; 660 sc->sc_swvol = mc->un.value.level[AUDIO_MIXER_LEVEL_MONO]; 661 return 0; 662 } 663 664 return ENXIO; 665 } 666 667 static int 668 pad_get_port(void *opaque, mixer_ctrl_t *mc) 669 { 670 struct pad_softc *sc = opaque; 671 672 KASSERT(mutex_owned(&sc->sc_lock)); 673 674 switch (mc->dev) { 675 case PAD_OUTPUT_MASTER_VOLUME: 676 case PAD_INPUT_DAC_VOLUME: 677 if (mc->un.value.num_channels != 1) 678 return EINVAL; 679 mc->un.value.level[AUDIO_MIXER_LEVEL_MONO] = sc->sc_swvol; 680 return 0; 681 } 682 683 return ENXIO; 684 } 685 686 static int 687 pad_query_devinfo(void *opaque, mixer_devinfo_t *di) 688 { 689 struct pad_softc *sc __diagused = opaque; 690 691 KASSERT(mutex_owned(&sc->sc_lock)); 692 693 switch (di->index) { 694 case PAD_OUTPUT_CLASS: 695 di->mixer_class = PAD_OUTPUT_CLASS; 696 strcpy(di->label.name, AudioCoutputs); 697 di->type = AUDIO_MIXER_CLASS; 698 di->next = di->prev = AUDIO_MIXER_LAST; 699 return 0; 700 case PAD_INPUT_CLASS: 701 di->mixer_class = PAD_INPUT_CLASS; 702 strcpy(di->label.name, AudioCinputs); 703 di->type = AUDIO_MIXER_CLASS; 704 di->next = di->prev = AUDIO_MIXER_LAST; 705 return 0; 706 case PAD_OUTPUT_MASTER_VOLUME: 707 di->mixer_class = PAD_OUTPUT_CLASS; 708 strcpy(di->label.name, AudioNmaster); 709 di->type = AUDIO_MIXER_VALUE; 710 di->next = di->prev = AUDIO_MIXER_LAST; 711 di->un.v.num_channels = 1; 712 strcpy(di->un.v.units.name, AudioNvolume); 713 return 0; 714 case PAD_INPUT_DAC_VOLUME: 715 di->mixer_class = PAD_INPUT_CLASS; 716 strcpy(di->label.name, AudioNdac); 717 di->type = AUDIO_MIXER_VALUE; 718 di->next = di->prev = AUDIO_MIXER_LAST; 719 di->un.v.num_channels = 1; 720 strcpy(di->un.v.units.name, AudioNvolume); 721 return 0; 722 } 723 724 return ENXIO; 725 } 726 727 static int 728 pad_get_props(void *opaque) 729 { 730 731 return AUDIO_PROP_PLAYBACK; 732 } 733 734 static void 735 pad_get_locks(void *opaque, kmutex_t **intr, kmutex_t **thread) 736 { 737 struct pad_softc *sc = opaque; 738 739 *intr = &sc->sc_intr_lock; 740 *thread = &sc->sc_lock; 741 } 742 743 static void 744 pad_swvol_codec(audio_filter_arg_t *arg) 745 { 746 struct pad_softc *sc = arg->context; 747 const uint8_t *src; 748 uint8_t *dst; 749 u_int sample_count; 750 u_int i; 751 u_int bits; 752 753 src = arg->src; 754 dst = arg->dst; 755 sample_count = arg->count * arg->srcfmt->channels; 756 bits = arg->srcfmt->precision; 757 758 for (i = 0; i < sample_count; i++) { 759 int64_t v; 760 761 switch (howmany(bits, NBBY)) { 762 case 2: /* AUDIO_INTERNAL_BITS == 16 */ 763 v = *(const int16_t *)src; 764 src += sizeof(int16_t); 765 break; 766 case 4: /* AUDIO_INTERNAL_BITS == 32 */ 767 v = *(const int32_t *)src; 768 src += sizeof(int32_t); 769 break; 770 default: 771 v = 0; 772 break; 773 } 774 775 v = v * sc->sc_swvol / 255; 776 777 if (PADPREC > bits) 778 v = v << (PADPREC - bits); 779 else if (PADPREC < bits) 780 v = v >> (bits - PADPREC); 781 782 /* AUDIO_ENCODING_SLINEAR_LE */ 783 #if PADPREC > 0 784 *dst++ = v; 785 #endif 786 #if PADPREC > 8 787 v >>= 8; 788 *dst++ = v; 789 #endif 790 #if PADPREC > 16 791 v >>= 8; 792 *dst++ = v; 793 #endif 794 #if PADPREC > 24 795 v >>= 8; 796 *dst++ = v; 797 #endif 798 } 799 } 800 801 MODULE(MODULE_CLASS_DRIVER, pad, "audio"); 802 803 #ifdef _MODULE 804 805 #include "ioconf.c" 806 807 devmajor_t cmajor = NODEVMAJOR, bmajor = NODEVMAJOR; 808 809 /* 810 * We need our own version of cfattach since config(1)'s ioconf does not 811 * generate what we need 812 */ 813 814 static struct cfattach *pad_cfattachinit[] = { &pad_ca, NULL }; 815 816 static struct cfattachinit pad_cfattach[] = { 817 { "pad", pad_cfattachinit }, 818 { NULL, NULL } 819 }; 820 #endif 821 822 static int 823 pad_modcmd(modcmd_t cmd, void *arg) 824 { 825 int error = 0; 826 827 switch (cmd) { 828 case MODULE_CMD_INIT: 829 #ifdef _MODULE 830 error = devsw_attach(pad_cd.cd_name, NULL, &bmajor, 831 &pad_cdevsw, &cmajor); 832 if (error) 833 break; 834 835 pad_cfattach[1] = cfattach_ioconf_pad[0]; 836 error = config_init_component(cfdriver_ioconf_pad, 837 pad_cfattach, cfdata_ioconf_pad); 838 if (error) { 839 devsw_detach(NULL, &pad_cdevsw); 840 break; 841 } 842 #endif 843 break; 844 845 case MODULE_CMD_FINI: 846 #ifdef _MODULE 847 error = config_fini_component(cfdriver_ioconf_pad, 848 pad_cfattach, cfdata_ioconf_pad); 849 if (error == 0) 850 devsw_detach(NULL, &pad_cdevsw); 851 #endif 852 break; 853 854 default: 855 error = ENOTTY; 856 } 857 858 return error; 859 } 860