src/sys/dev/sound/pcm/mixer.c - view

File: [DragonFly] / src / sys / dev / sound / pcm / mixer.c
Revision 1.6: download - view: text, annotated - select for diffs
Wed May 19 22:52:50 2004 UTC (9 years ago) by dillon
Branches: MAIN
CVS tags: HEAD

Device layer rollup commit.

* cdevsw_add() is now required.  cdevsw_add() and cdevsw_remove() may specify
  a mask/match indicating the range of supported minor numbers.  Multiple
  cdevsw_add()'s using the same major number, but distinctly different
  ranges, may be issued.  All devices that failed to call cdevsw_add() before
  now do.

* cdevsw_remove() now automatically marks all devices within its supported
  range as being destroyed.

* vnode->v_rdev is no longer resolved when the vnode is created.  Instead,
  only v_udev (a newly added field) is resolved.  v_rdev is resolved when
  the vnode is opened and cleared on the last close.

* A great deal of code was making rather dubious assumptions with regards
  to the validity of devices associated with vnodes, primarily due to
  the persistence of a device structure due to being indexed by (major, minor)
  instead of by (cdevsw, major, minor).  In particular, if you run a program
  which connects to a USB device and then you pull the USB device and plug
  it back in, the vnode subsystem will continue to believe that the device
  is open when, in fact, it isn't (because it was destroyed and recreated).

  In particular, note that all the VFS mount procedures now check devices
  via v_udev instead of v_rdev prior to calling VOP_OPEN(), since v_rdev
  is NULL prior to the first open.

* The disk layer's device interaction has been rewritten.  The disk layer
  (i.e. the slice and disklabel management layer) no longer overloads
  its data onto the device structure representing the underlying physical
  disk.  Instead, the disk layer uses the new cdevsw_add() functionality
  to register its own cdevsw using the underlying device's major number,
  and simply does NOT register the underlying device's cdevsw.  No
  confusion is created because the device hash is now based on
  (cdevsw,major,minor) rather then (major,minor).

  NOTE: This also means that underlying raw disk devices may use the entire
  device minor number instead of having to reserve the bits used by the disk
  layer, and also means that can we (theoretically) stack a fully
  disklabel-supported 'disk' on top of any block device.

* The new reference counting scheme prevents this by associating a device
  with a cdevsw and disconnecting the device from its cdevsw when the cdevsw
  is removed.  Additionally, all udev2dev() lookups run through the cdevsw
  mask/match and only successfully find devices still associated with an
  active cdevsw.

* Major work on MFS:  MFS no longer shortcuts vnode and device creation.  It
  now creates a real vnode and a real device and implements real open and
  close VOPs.  Additionally, due to the disk layer changes, MFS is no longer
  limited to 255 mounts.  The new limit is 16 million.  Since MFS creates a
  real device node, mount_mfs will now create a real /dev/mfs<PID> device
  that can be read from userland (e.g. so you can dump an MFS filesystem).

* BUF AND DEVICE STRATEGY changes.  The struct buf contains a b_dev field.
  In order to properly handle stacked devices we now require that the b_dev
  field be initialized before the device strategy routine is called.  This
  required some additional work in various VFS implementations.  To enforce
  this requirement, biodone() now sets b_dev to NODEV.  The new disk layer
  will adjust b_dev before forwarding a request to the actual physical
  device.

* A bug in the ISO CD boot sequence which resulted in a panic has been fixed.

Testing by: lots of people, but David Rhodus found the most aggregious bugs.

1: /* 2: * Copyright (c) 1999 Cameron Grant <gandalf@vilnya.demon.co.uk> 3: * All rights reserved. 4: * 5: * Redistribution and use in source and binary forms, with or without 6: * modification, are permitted provided that the following conditions 7: * are met: 8: * 1. Redistributions of source code must retain the above copyright 9: * notice, this list of conditions and the following disclaimer. 10: * 2. Redistributions in binary form must reproduce the above copyright 11: * notice, this list of conditions and the following disclaimer in the 12: * documentation and/or other materials provided with the distribution. 13: * 14: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24: * SUCH DAMAGE. 25: * 26: * $FreeBSD: src/sys/dev/sound/pcm/mixer.c,v 1.4.2.8 2002/04/22 15:49:36 cg Exp $ 27: * $DragonFly: src/sys/dev/sound/pcm/mixer.c,v 1.6 2004/05/19 22:52:50 dillon Exp $ 28: */ 29: 30: #include <dev/sound/pcm/sound.h> 31: 32: #include "mixer_if.h" 33: 34: SND_DECLARE_FILE("$DragonFly: src/sys/dev/sound/pcm/mixer.c,v 1.6 2004/05/19 22:52:50 dillon Exp $"); 35: 36: MALLOC_DEFINE(M_MIXER, "mixer", "mixer"); 37: 38: #define MIXER_NAMELEN 16 39: struct snd_mixer { 40: KOBJ_FIELDS; 41: const char *type; 42: void *devinfo; 43: int busy; 44: int hwvol_muted; 45: int hwvol_mixer; 46: int hwvol_step; 47: u_int32_t hwvol_mute_level; 48: u_int32_t devs; 49: u_int32_t recdevs; 50: u_int32_t recsrc; 51: u_int16_t level[32]; 52: char name[MIXER_NAMELEN]; 53: void *lock; 54: }; 55: 56: static u_int16_t snd_mixerdefaults[SOUND_MIXER_NRDEVICES] = { 57: [SOUND_MIXER_VOLUME] = 75, 58: [SOUND_MIXER_BASS] = 50, 59: [SOUND_MIXER_TREBLE] = 50, 60: [SOUND_MIXER_SYNTH] = 75, 61: [SOUND_MIXER_PCM] = 75, 62: [SOUND_MIXER_SPEAKER] = 75, 63: [SOUND_MIXER_LINE] = 75, 64: [SOUND_MIXER_MIC] = 0, 65: [SOUND_MIXER_CD] = 75, 66: [SOUND_MIXER_LINE1] = 75, 67: [SOUND_MIXER_VIDEO] = 75, 68: [SOUND_MIXER_RECLEV] = 0, 69: [SOUND_MIXER_OGAIN] = 50, 70: [SOUND_MIXER_MONITOR] = 75, 71: }; 72: 73: static char* snd_mixernames[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES; 74: 75: static d_open_t mixer_open; 76: static d_close_t mixer_close; 77: 78: static struct cdevsw mixer_cdevsw = { 79: /* name */ "mixer", 80: /* maj */ SND_CDEV_MAJOR, 81: /* flags */ 0, 82: /* port */ NULL, 83: /* clone */ NULL, 84: 85: /* open */ mixer_open, 86: /* close */ mixer_close, 87: /* read */ noread, 88: /* write */ nowrite, 89: /* ioctl */ mixer_ioctl, 90: /* poll */ nopoll, 91: /* mmap */ nommap, 92: /* strategy */ nostrategy, 93: /* dump */ nodump, 94: /* psize */ nopsize 95: }; 96: 97: #ifdef USING_DEVFS 98: static eventhandler_tag mixer_ehtag; 99: #endif 100: 101: static dev_t 102: mixer_get_devt(device_t dev) 103: { 104: dev_t pdev; 105: int unit; 106: 107: unit = device_get_unit(dev); 108: pdev = make_adhoc_dev(&mixer_cdevsw, PCMMKMINOR(unit, SND_DEV_CTL, 0)); 109: 110: return pdev; 111: } 112: 113: #ifdef SND_DYNSYSCTL 114: static int 115: mixer_lookup(char *devname) 116: { 117: int i; 118: 119: for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) 120: if (strncmp(devname, snd_mixernames[i], 121: strlen(snd_mixernames[i])) == 0) 122: return i; 123: return -1; 124: } 125: #endif 126: 127: static int 128: mixer_set(struct snd_mixer *mixer, unsigned dev, unsigned lev) 129: { 130: unsigned l, r; 131: int v; 132: 133: if ((dev >= SOUND_MIXER_NRDEVICES) || (0 == (mixer->devs & (1 << dev)))) 134: return -1; 135: 136: l = min((lev & 0x00ff), 100); 137: r = min(((lev & 0xff00) >> 8), 100); 138: 139: v = MIXER_SET(mixer, dev, l, r); 140: if (v < 0) 141: return -1; 142: 143: mixer->level[dev] = l | (r << 8); 144: return 0; 145: } 146: 147: static int 148: mixer_get(struct snd_mixer *mixer, int dev) 149: { 150: if ((dev < SOUND_MIXER_NRDEVICES) && (mixer->devs & (1 << dev))) 151: return mixer->level[dev]; 152: else return -1; 153: } 154: 155: static int 156: mixer_setrecsrc(struct snd_mixer *mixer, u_int32_t src) 157: { 158: src &= mixer->recdevs; 159: if (src == 0) 160: src = SOUND_MASK_MIC; 161: mixer->recsrc = MIXER_SETRECSRC(mixer, src); 162: return 0; 163: } 164: 165: static int 166: mixer_getrecsrc(struct snd_mixer *mixer) 167: { 168: return mixer->recsrc; 169: } 170: 171: void 172: mix_setdevs(struct snd_mixer *m, u_int32_t v) 173: { 174: m->devs = v; 175: } 176: 177: void 178: mix_setrecdevs(struct snd_mixer *m, u_int32_t v) 179: { 180: m->recdevs = v; 181: } 182: 183: u_int32_t 184: mix_getdevs(struct snd_mixer *m) 185: { 186: return m->devs; 187: } 188: 189: u_int32_t 190: mix_getrecdevs(struct snd_mixer *m) 191: { 192: return m->recdevs; 193: } 194: 195: void * 196: mix_getdevinfo(struct snd_mixer *m) 197: { 198: return m->devinfo; 199: } 200: 201: int 202: mixer_init(device_t dev, kobj_class_t cls, void *devinfo) 203: { 204: struct snd_mixer *m; 205: u_int16_t v; 206: dev_t pdev; 207: int i, unit; 208: 209: m = (struct snd_mixer *)kobj_create(cls, M_MIXER, M_WAITOK | M_ZERO); 210: snprintf(m->name, MIXER_NAMELEN, "%s:mixer", device_get_nameunit(dev)); 211: m->lock = snd_mtxcreate(m->name, "pcm mixer"); 212: m->type = cls->name; 213: m->devinfo = devinfo; 214: m->busy = 0; 215: 216: if (MIXER_INIT(m)) 217: goto bad; 218: 219: for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) { 220: v = snd_mixerdefaults[i]; 221: mixer_set(m, i, v | (v << 8)); 222: } 223: 224: mixer_setrecsrc(m, SOUND_MASK_MIC); 225: 226: unit = device_get_unit(dev); 227: cdevsw_add(&mixer_cdevsw, PCMMKMINOR(-1, 0, 0), PCMMKMINOR(unit, 0, 0)); 228: pdev = make_dev(&mixer_cdevsw, PCMMKMINOR(unit, SND_DEV_CTL, 0), 229: UID_ROOT, GID_WHEEL, 0666, "mixer%d", unit); 230: pdev->si_drv1 = m; 231: 232: return 0; 233: 234: bad: 235: snd_mtxlock(m->lock); 236: snd_mtxfree(m->lock); 237: kobj_delete((kobj_t)m, M_MIXER); 238: return -1; 239: } 240: 241: int 242: mixer_uninit(device_t dev) 243: { 244: int i; 245: struct snd_mixer *m; 246: dev_t pdev; 247: 248: pdev = mixer_get_devt(dev); 249: m = pdev->si_drv1; 250: snd_mtxlock(m->lock); 251: 252: if (m->busy) { 253: snd_mtxunlock(m->lock); 254: return EBUSY; 255: } 256: 257: pdev->si_drv1 = NULL; 258: 259: /* 260: * The mixer might be used by several entities, so we do not 261: * want to remove the cdevsw here. Destroy the device instead. 262: * destroy_dev() requires a reference count. 263: */ 264: reference_dev(pdev); 265: destroy_dev(pdev); 266: 267: for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) 268: mixer_set(m, i, 0); 269: 270: mixer_setrecsrc(m, SOUND_MASK_MIC); 271: 272: MIXER_UNINIT(m); 273: 274: snd_mtxfree(m->lock); 275: kobj_delete((kobj_t)m, M_MIXER); 276: 277: return 0; 278: } 279: 280: int 281: mixer_reinit(device_t dev) 282: { 283: struct snd_mixer *m; 284: dev_t pdev; 285: int i; 286: 287: pdev = mixer_get_devt(dev); 288: m = pdev->si_drv1; 289: snd_mtxlock(m->lock); 290: 291: i = MIXER_REINIT(m); 292: if (i) { 293: snd_mtxunlock(m->lock); 294: return i; 295: } 296: 297: for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) 298: mixer_set(m, i, m->level[i]); 299: 300: mixer_setrecsrc(m, m->recsrc); 301: snd_mtxunlock(m->lock); 302: 303: return 0; 304: } 305: 306: #ifdef SND_DYNSYSCTL 307: static int 308: sysctl_hw_snd_hwvol_mixer(SYSCTL_HANDLER_ARGS) 309: { 310: char devname[32]; 311: int error, dev; 312: struct snd_mixer *m; 313: 314: m = oidp->oid_arg1; 315: snd_mtxlock(m->lock); 316: strncpy(devname, snd_mixernames[m->hwvol_mixer], sizeof(devname)); 317: error = sysctl_handle_string(oidp, &devname[0], sizeof(devname), req); 318: if (error == 0 && req->newptr != NULL) { 319: dev = mixer_lookup(devname); 320: if (dev == -1) { 321: snd_mtxunlock(m->lock); 322: return EINVAL; 323: } 324: else if (dev != m->hwvol_mixer) { 325: m->hwvol_mixer = dev; 326: m->hwvol_muted = 0; 327: } 328: } 329: snd_mtxunlock(m->lock); 330: return error; 331: } 332: #endif 333: 334: int 335: mixer_hwvol_init(device_t dev) 336: { 337: struct snd_mixer *m; 338: dev_t pdev; 339: 340: pdev = mixer_get_devt(dev); 341: m = pdev->si_drv1; 342: snd_mtxlock(m->lock); 343: 344: m->hwvol_mixer = SOUND_MIXER_VOLUME; 345: m->hwvol_step = 5; 346: #ifdef SND_DYNSYSCTL 347: SYSCTL_ADD_INT(snd_sysctl_tree(dev), SYSCTL_CHILDREN(snd_sysctl_tree_top(dev)), 348: OID_AUTO, "hwvol_step", CTLFLAG_RW, &m->hwvol_step, 0, ""); 349: SYSCTL_ADD_PROC(snd_sysctl_tree(dev), SYSCTL_CHILDREN(snd_sysctl_tree_top(dev)), 350: OID_AUTO, "hwvol_mixer", CTLTYPE_STRING | CTLFLAG_RW, m, 0, 351: sysctl_hw_snd_hwvol_mixer, "A", "") 352: #endif 353: snd_mtxunlock(m->lock); 354: return 0; 355: } 356: 357: void 358: mixer_hwvol_mute(device_t dev) 359: { 360: struct snd_mixer *m; 361: dev_t pdev; 362: 363: pdev = mixer_get_devt(dev); 364: m = pdev->si_drv1; 365: snd_mtxlock(m->lock); 366: if (m->hwvol_muted) { 367: m->hwvol_muted = 0; 368: mixer_set(m, m->hwvol_mixer, m->hwvol_mute_level); 369: } else { 370: m->hwvol_muted++; 371: m->hwvol_mute_level = mixer_get(m, m->hwvol_mixer); 372: mixer_set(m, m->hwvol_mixer, 0); 373: } 374: snd_mtxunlock(m->lock); 375: } 376: 377: void 378: mixer_hwvol_step(device_t dev, int left_step, int right_step) 379: { 380: struct snd_mixer *m; 381: int level, left, right; 382: dev_t pdev; 383: 384: pdev = mixer_get_devt(dev); 385: m = pdev->si_drv1; 386: snd_mtxlock(m->lock); 387: if (m->hwvol_muted) { 388: m->hwvol_muted = 0; 389: level = m->hwvol_mute_level; 390: } else 391: level = mixer_get(m, m->hwvol_mixer); 392: if (level != -1) { 393: left = level & 0xff; 394: right = level >> 8; 395: left += left_step * m->hwvol_step; 396: if (left < 0) 397: left = 0; 398: right += right_step * m->hwvol_step; 399: if (right < 0) 400: right = 0; 401: mixer_set(m, m->hwvol_mixer, left | right << 8); 402: } 403: snd_mtxunlock(m->lock); 404: } 405: 406: /* ----------------------------------------------------------------------- */ 407: 408: static int 409: mixer_open(dev_t i_dev, int flags, int mode, struct thread *td) 410: { 411: struct snd_mixer *m; 412: intrmask_t s; 413: 414: m = i_dev->si_drv1; 415: s = spltty(); 416: snd_mtxlock(m->lock); 417: 418: m->busy++; 419: 420: snd_mtxunlock(m->lock); 421: splx(s); 422: return 0; 423: } 424: 425: static int 426: mixer_close(dev_t i_dev, int flags, int mode, struct thread *td) 427: { 428: struct snd_mixer *m; 429: intrmask_t s; 430: 431: m = i_dev->si_drv1; 432: s = spltty(); 433: snd_mtxlock(m->lock); 434: 435: if (!m->busy) { 436: snd_mtxunlock(m->lock); 437: splx(s); 438: return EBADF; 439: } 440: m->busy--; 441: 442: snd_mtxunlock(m->lock); 443: splx(s); 444: return 0; 445: } 446: 447: int 448: mixer_ioctl(dev_t i_dev, u_long cmd, caddr_t arg, int mode, struct thread *td) 449: { 450: struct snd_mixer *m; 451: intrmask_t s; 452: int ret, *arg_i = (int *)arg; 453: int v = -1, j = cmd & 0xff; 454: 455: m = i_dev->si_drv1; 456: if (!m->busy) 457: return EBADF; 458: 459: s = spltty(); 460: snd_mtxlock(m->lock); 461: if ((cmd & MIXER_WRITE(0)) == MIXER_WRITE(0)) { 462: if (j == SOUND_MIXER_RECSRC) 463: ret = mixer_setrecsrc(m, *arg_i); 464: else 465: ret = mixer_set(m, j, *arg_i); 466: snd_mtxunlock(m->lock); 467: splx(s); 468: return (ret == 0)? 0 : ENXIO; 469: } 470: 471: if ((cmd & MIXER_READ(0)) == MIXER_READ(0)) { 472: switch (j) { 473: case SOUND_MIXER_DEVMASK: 474: case SOUND_MIXER_CAPS: 475: case SOUND_MIXER_STEREODEVS: 476: v = mix_getdevs(m); 477: break; 478: 479: case SOUND_MIXER_RECMASK: 480: v = mix_getrecdevs(m); 481: break; 482: 483: case SOUND_MIXER_RECSRC: 484: v = mixer_getrecsrc(m); 485: break; 486: 487: default: 488: v = mixer_get(m, j); 489: } 490: *arg_i = v; 491: snd_mtxunlock(m->lock); 492: return (v != -1)? 0 : ENXIO; 493: } 494: snd_mtxunlock(m->lock); 495: splx(s); 496: return ENXIO; 497: } 498: 499: #ifdef USING_DEVFS 500: static void 501: mixer_clone(void *arg, char *name, int namelen, dev_t *dev) 502: { 503: dev_t pdev; 504: 505: if (*dev != NODEV) 506: return; 507: if (strcmp(name, "mixer") == 0) { 508: pdev = make_adhoc_dev(&mixer_cdevsw, 509: PCMMKMINOR(snd_unit, SND_DEV_CTL, 0)); 510: if (pdev->si_flags & SI_NAMED) 511: *dev = pdev; 512: } 513: } 514: 515: static void 516: mixer_sysinit(void *p) 517: { 518: mixer_ehtag = EVENTHANDLER_REGISTER(dev_clone, mixer_clone, 0, 1000); 519: } 520: 521: static void 522: mixer_sysuninit(void *p) 523: { 524: if (mixer_ehtag != NULL) 525: EVENTHANDLER_DEREGISTER(dev_clone, mixer_ehtag); 526: } 527: 528: SYSINIT(mixer_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, mixer_sysinit, NULL); 529: SYSUNINIT(mixer_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, mixer_sysuninit, NULL); 530: #endif 531: 532: