Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/pcm/mixer.c
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1 /* 2 * Copyright (c) 1999 Cameron Grant <cg@freebsd.org> 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 27 #include <dev/sound/pcm/sound.h> 28 29 #include "mixer_if.h" 30 31 SND_DECLARE_FILE("$FreeBSD: releng/5.2/sys/dev/sound/pcm/mixer.c 122461 2003-11-11 05:38:28Z scottl $"); 32 33 MALLOC_DEFINE(M_MIXER, "mixer", "mixer"); 34 35 #define MIXER_NAMELEN 16 36 struct snd_mixer { 37 KOBJ_FIELDS; 38 const char *type; 39 void *devinfo; 40 int busy; 41 int hwvol_muted; 42 int hwvol_mixer; 43 int hwvol_step; 44 u_int32_t hwvol_mute_level; 45 u_int32_t devs; 46 u_int32_t recdevs; 47 u_int32_t recsrc; 48 u_int16_t level[32]; 49 char name[MIXER_NAMELEN]; 50 struct mtx *lock; 51 }; 52 53 static u_int16_t snd_mixerdefaults[SOUND_MIXER_NRDEVICES] = { 54 [SOUND_MIXER_VOLUME] = 75, 55 [SOUND_MIXER_BASS] = 50, 56 [SOUND_MIXER_TREBLE] = 50, 57 [SOUND_MIXER_SYNTH] = 75, 58 [SOUND_MIXER_PCM] = 75, 59 [SOUND_MIXER_SPEAKER] = 75, 60 [SOUND_MIXER_LINE] = 75, 61 [SOUND_MIXER_MIC] = 0, 62 [SOUND_MIXER_CD] = 75, 63 [SOUND_MIXER_LINE1] = 75, 64 [SOUND_MIXER_VIDEO] = 75, 65 [SOUND_MIXER_RECLEV] = 0, 66 [SOUND_MIXER_OGAIN] = 50, 67 [SOUND_MIXER_MONITOR] = 75, 68 }; 69 70 static char* snd_mixernames[SOUND_MIXER_NRDEVICES] = SOUND_DEVICE_NAMES; 71 72 static d_open_t mixer_open; 73 static d_close_t mixer_close; 74 75 static struct cdevsw mixer_cdevsw = { 76 .d_open = mixer_open, 77 .d_close = mixer_close, 78 .d_ioctl = mixer_ioctl, 79 .d_name = "mixer", 80 .d_maj = SND_CDEV_MAJOR, 81 }; 82 83 #ifdef USING_DEVFS 84 static eventhandler_tag mixer_ehtag; 85 #endif 86 87 static dev_t 88 mixer_get_devt(device_t dev) 89 { 90 dev_t pdev; 91 int unit; 92 93 unit = device_get_unit(dev); 94 pdev = makedev(SND_CDEV_MAJOR, PCMMKMINOR(unit, SND_DEV_CTL, 0)); 95 96 return pdev; 97 } 98 99 #ifdef SND_DYNSYSCTL 100 static int 101 mixer_lookup(char *devname) 102 { 103 int i; 104 105 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) 106 if (strncmp(devname, snd_mixernames[i], 107 strlen(snd_mixernames[i])) == 0) 108 return i; 109 return -1; 110 } 111 #endif 112 113 static int 114 mixer_set(struct snd_mixer *mixer, unsigned dev, unsigned lev) 115 { 116 unsigned l, r; 117 int v; 118 119 if ((dev >= SOUND_MIXER_NRDEVICES) || (0 == (mixer->devs & (1 << dev)))) 120 return -1; 121 122 l = min((lev & 0x00ff), 100); 123 r = min(((lev & 0xff00) >> 8), 100); 124 125 v = MIXER_SET(mixer, dev, l, r); 126 if (v < 0) 127 return -1; 128 129 mixer->level[dev] = l | (r << 8); 130 return 0; 131 } 132 133 static int 134 mixer_get(struct snd_mixer *mixer, int dev) 135 { 136 if ((dev < SOUND_MIXER_NRDEVICES) && (mixer->devs & (1 << dev))) 137 return mixer->level[dev]; 138 else return -1; 139 } 140 141 static int 142 mixer_setrecsrc(struct snd_mixer *mixer, u_int32_t src) 143 { 144 src &= mixer->recdevs; 145 if (src == 0) 146 src = SOUND_MASK_MIC; 147 mixer->recsrc = MIXER_SETRECSRC(mixer, src); 148 return 0; 149 } 150 151 static int 152 mixer_getrecsrc(struct snd_mixer *mixer) 153 { 154 return mixer->recsrc; 155 } 156 157 void 158 mix_setdevs(struct snd_mixer *m, u_int32_t v) 159 { 160 m->devs = v; 161 } 162 163 void 164 mix_setrecdevs(struct snd_mixer *m, u_int32_t v) 165 { 166 m->recdevs = v; 167 } 168 169 u_int32_t 170 mix_getdevs(struct snd_mixer *m) 171 { 172 return m->devs; 173 } 174 175 u_int32_t 176 mix_getrecdevs(struct snd_mixer *m) 177 { 178 return m->recdevs; 179 } 180 181 void * 182 mix_getdevinfo(struct snd_mixer *m) 183 { 184 return m->devinfo; 185 } 186 187 int 188 mixer_init(device_t dev, kobj_class_t cls, void *devinfo) 189 { 190 struct snd_mixer *m; 191 u_int16_t v; 192 dev_t pdev; 193 int i, unit; 194 195 m = (struct snd_mixer *)kobj_create(cls, M_MIXER, M_WAITOK | M_ZERO); 196 snprintf(m->name, MIXER_NAMELEN, "%s:mixer", device_get_nameunit(dev)); 197 m->lock = snd_mtxcreate(m->name, "pcm mixer"); 198 m->type = cls->name; 199 m->devinfo = devinfo; 200 m->busy = 0; 201 202 if (MIXER_INIT(m)) 203 goto bad; 204 205 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) { 206 v = snd_mixerdefaults[i]; 207 mixer_set(m, i, v | (v << 8)); 208 } 209 210 mixer_setrecsrc(m, SOUND_MASK_MIC); 211 212 unit = device_get_unit(dev); 213 pdev = make_dev(&mixer_cdevsw, PCMMKMINOR(unit, SND_DEV_CTL, 0), 214 UID_ROOT, GID_WHEEL, 0666, "mixer%d", unit); 215 pdev->si_drv1 = m; 216 217 return 0; 218 219 bad: 220 snd_mtxlock(m->lock); 221 snd_mtxfree(m->lock); 222 kobj_delete((kobj_t)m, M_MIXER); 223 return -1; 224 } 225 226 int 227 mixer_uninit(device_t dev) 228 { 229 int i; 230 struct snd_mixer *m; 231 dev_t pdev; 232 233 pdev = mixer_get_devt(dev); 234 m = pdev->si_drv1; 235 snd_mtxlock(m->lock); 236 237 if (m->busy) { 238 snd_mtxunlock(m->lock); 239 return EBUSY; 240 } 241 242 pdev->si_drv1 = NULL; 243 destroy_dev(pdev); 244 245 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) 246 mixer_set(m, i, 0); 247 248 mixer_setrecsrc(m, SOUND_MASK_MIC); 249 250 MIXER_UNINIT(m); 251 252 snd_mtxfree(m->lock); 253 kobj_delete((kobj_t)m, M_MIXER); 254 255 return 0; 256 } 257 258 int 259 mixer_reinit(device_t dev) 260 { 261 struct snd_mixer *m; 262 dev_t pdev; 263 int i; 264 265 pdev = mixer_get_devt(dev); 266 m = pdev->si_drv1; 267 snd_mtxlock(m->lock); 268 269 i = MIXER_REINIT(m); 270 if (i) { 271 snd_mtxunlock(m->lock); 272 return i; 273 } 274 275 for (i = 0; i < SOUND_MIXER_NRDEVICES; i++) 276 mixer_set(m, i, m->level[i]); 277 278 mixer_setrecsrc(m, m->recsrc); 279 snd_mtxunlock(m->lock); 280 281 return 0; 282 } 283 284 #ifdef SND_DYNSYSCTL 285 static int 286 sysctl_hw_snd_hwvol_mixer(SYSCTL_HANDLER_ARGS) 287 { 288 char devname[32]; 289 int error, dev; 290 struct snd_mixer *m; 291 292 m = oidp->oid_arg1; 293 snd_mtxlock(m->lock); 294 strncpy(devname, snd_mixernames[m->hwvol_mixer], sizeof(devname)); 295 snd_mtxunlock(m->lock); 296 error = sysctl_handle_string(oidp, &devname[0], sizeof(devname), req); 297 snd_mtxlock(m->lock); 298 if (error == 0 && req->newptr != NULL) { 299 dev = mixer_lookup(devname); 300 if (dev == -1) { 301 snd_mtxunlock(m->lock); 302 return EINVAL; 303 } 304 else if (dev != m->hwvol_mixer) { 305 m->hwvol_mixer = dev; 306 m->hwvol_muted = 0; 307 } 308 } 309 snd_mtxunlock(m->lock); 310 return error; 311 } 312 #endif 313 314 int 315 mixer_hwvol_init(device_t dev) 316 { 317 struct snd_mixer *m; 318 dev_t pdev; 319 320 pdev = mixer_get_devt(dev); 321 m = pdev->si_drv1; 322 323 m->hwvol_mixer = SOUND_MIXER_VOLUME; 324 m->hwvol_step = 5; 325 #ifdef SND_DYNSYSCTL 326 SYSCTL_ADD_INT(snd_sysctl_tree(dev), SYSCTL_CHILDREN(snd_sysctl_tree_top(dev)), 327 OID_AUTO, "hwvol_step", CTLFLAG_RW, &m->hwvol_step, 0, ""); 328 SYSCTL_ADD_PROC(snd_sysctl_tree(dev), SYSCTL_CHILDREN(snd_sysctl_tree_top(dev)), 329 OID_AUTO, "hwvol_mixer", CTLTYPE_STRING | CTLFLAG_RW, m, 0, 330 sysctl_hw_snd_hwvol_mixer, "A", ""); 331 #endif 332 return 0; 333 } 334 335 void 336 mixer_hwvol_mute(device_t dev) 337 { 338 struct snd_mixer *m; 339 dev_t pdev; 340 341 pdev = mixer_get_devt(dev); 342 m = pdev->si_drv1; 343 snd_mtxlock(m->lock); 344 if (m->hwvol_muted) { 345 m->hwvol_muted = 0; 346 mixer_set(m, m->hwvol_mixer, m->hwvol_mute_level); 347 } else { 348 m->hwvol_muted++; 349 m->hwvol_mute_level = mixer_get(m, m->hwvol_mixer); 350 mixer_set(m, m->hwvol_mixer, 0); 351 } 352 snd_mtxunlock(m->lock); 353 } 354 355 void 356 mixer_hwvol_step(device_t dev, int left_step, int right_step) 357 { 358 struct snd_mixer *m; 359 int level, left, right; 360 dev_t pdev; 361 362 pdev = mixer_get_devt(dev); 363 m = pdev->si_drv1; 364 snd_mtxlock(m->lock); 365 if (m->hwvol_muted) { 366 m->hwvol_muted = 0; 367 level = m->hwvol_mute_level; 368 } else 369 level = mixer_get(m, m->hwvol_mixer); 370 if (level != -1) { 371 left = level & 0xff; 372 right = level >> 8; 373 left += left_step * m->hwvol_step; 374 if (left < 0) 375 left = 0; 376 right += right_step * m->hwvol_step; 377 if (right < 0) 378 right = 0; 379 mixer_set(m, m->hwvol_mixer, left | right << 8); 380 } 381 snd_mtxunlock(m->lock); 382 } 383 384 /* ----------------------------------------------------------------------- */ 385 386 static int 387 mixer_open(dev_t i_dev, int flags, int mode, struct thread *td) 388 { 389 struct snd_mixer *m; 390 intrmask_t s; 391 392 m = i_dev->si_drv1; 393 s = spltty(); 394 snd_mtxlock(m->lock); 395 396 m->busy++; 397 398 snd_mtxunlock(m->lock); 399 splx(s); 400 return 0; 401 } 402 403 static int 404 mixer_close(dev_t i_dev, int flags, int mode, struct thread *td) 405 { 406 struct snd_mixer *m; 407 intrmask_t s; 408 409 m = i_dev->si_drv1; 410 s = spltty(); 411 snd_mtxlock(m->lock); 412 413 if (!m->busy) { 414 snd_mtxunlock(m->lock); 415 splx(s); 416 return EBADF; 417 } 418 m->busy--; 419 420 snd_mtxunlock(m->lock); 421 splx(s); 422 return 0; 423 } 424 425 int 426 mixer_ioctl(dev_t i_dev, u_long cmd, caddr_t arg, int mode, struct thread *td) 427 { 428 struct snd_mixer *m; 429 intrmask_t s; 430 int ret, *arg_i = (int *)arg; 431 int v = -1, j = cmd & 0xff; 432 433 m = i_dev->si_drv1; 434 if (!m->busy) 435 return EBADF; 436 437 s = spltty(); 438 snd_mtxlock(m->lock); 439 if ((cmd & MIXER_WRITE(0)) == MIXER_WRITE(0)) { 440 if (j == SOUND_MIXER_RECSRC) 441 ret = mixer_setrecsrc(m, *arg_i); 442 else 443 ret = mixer_set(m, j, *arg_i); 444 snd_mtxunlock(m->lock); 445 splx(s); 446 return (ret == 0)? 0 : ENXIO; 447 } 448 449 if ((cmd & MIXER_READ(0)) == MIXER_READ(0)) { 450 switch (j) { 451 case SOUND_MIXER_DEVMASK: 452 case SOUND_MIXER_CAPS: 453 case SOUND_MIXER_STEREODEVS: 454 v = mix_getdevs(m); 455 break; 456 457 case SOUND_MIXER_RECMASK: 458 v = mix_getrecdevs(m); 459 break; 460 461 case SOUND_MIXER_RECSRC: 462 v = mixer_getrecsrc(m); 463 break; 464 465 default: 466 v = mixer_get(m, j); 467 } 468 *arg_i = v; 469 snd_mtxunlock(m->lock); 470 return (v != -1)? 0 : ENXIO; 471 } 472 snd_mtxunlock(m->lock); 473 splx(s); 474 return ENXIO; 475 } 476 477 #ifdef USING_DEVFS 478 static void 479 mixer_clone(void *arg, char *name, int namelen, dev_t *dev) 480 { 481 dev_t pdev; 482 483 if (*dev != NODEV) 484 return; 485 if (strcmp(name, "mixer") == 0) { 486 pdev = makedev(SND_CDEV_MAJOR, PCMMKMINOR(snd_unit, SND_DEV_CTL, 0)); 487 if (pdev->si_flags & SI_NAMED) 488 *dev = pdev; 489 } 490 } 491 492 static void 493 mixer_sysinit(void *p) 494 { 495 mixer_ehtag = EVENTHANDLER_REGISTER(dev_clone, mixer_clone, 0, 1000); 496 } 497 498 static void 499 mixer_sysuninit(void *p) 500 { 501 if (mixer_ehtag != NULL) 502 EVENTHANDLER_DEREGISTER(dev_clone, mixer_ehtag); 503 } 504 505 SYSINIT(mixer_sysinit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, mixer_sysinit, NULL); 506 SYSUNINIT(mixer_sysuninit, SI_SUB_DRIVERS, SI_ORDER_MIDDLE, mixer_sysuninit, NULL); 507 #endif 508 509
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