1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/module.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/time.h> 27 #include <linux/pm_qos.h> 28 #include <linux/aio.h> 29 #include <linux/dma-mapping.h> 30 #include <sound/core.h> 31 #include <sound/control.h> 32 #include <sound/info.h> 33 #include <sound/pcm.h> 34 #include <sound/pcm_params.h> 35 #include <sound/timer.h> 36 #include <sound/minors.h> 37 #include <asm/io.h> 38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 39 #include <dma-coherence.h> 40 #endif 41 42 /* 43 * Compatibility 44 */ 45 46 struct snd_pcm_hw_params_old { 47 unsigned int flags; 48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 49 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 52 unsigned int rmask; 53 unsigned int cmask; 54 unsigned int info; 55 unsigned int msbits; 56 unsigned int rate_num; 57 unsigned int rate_den; 58 snd_pcm_uframes_t fifo_size; 59 unsigned char reserved[64]; 60 }; 61 62 #ifdef CONFIG_SND_SUPPORT_OLD_API 63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 65 66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 67 struct snd_pcm_hw_params_old __user * _oparams); 68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 69 struct snd_pcm_hw_params_old __user * _oparams); 70 #endif 71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 72 73 /* 74 * 75 */ 76 77 DEFINE_RWLOCK(snd_pcm_link_rwlock); 78 EXPORT_SYMBOL(snd_pcm_link_rwlock); 79 80 static DECLARE_RWSEM(snd_pcm_link_rwsem); 81 82 static inline mm_segment_t snd_enter_user(void) 83 { 84 mm_segment_t fs = get_fs(); 85 set_fs(get_ds()); 86 return fs; 87 } 88 89 static inline void snd_leave_user(mm_segment_t fs) 90 { 91 set_fs(fs); 92 } 93 94 95 96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 97 { 98 struct snd_pcm_runtime *runtime; 99 struct snd_pcm *pcm = substream->pcm; 100 struct snd_pcm_str *pstr = substream->pstr; 101 102 memset(info, 0, sizeof(*info)); 103 info->card = pcm->card->number; 104 info->device = pcm->device; 105 info->stream = substream->stream; 106 info->subdevice = substream->number; 107 strlcpy(info->id, pcm->id, sizeof(info->id)); 108 strlcpy(info->name, pcm->name, sizeof(info->name)); 109 info->dev_class = pcm->dev_class; 110 info->dev_subclass = pcm->dev_subclass; 111 info->subdevices_count = pstr->substream_count; 112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 113 strlcpy(info->subname, substream->name, sizeof(info->subname)); 114 runtime = substream->runtime; 115 /* AB: FIXME!!! This is definitely nonsense */ 116 if (runtime) { 117 info->sync = runtime->sync; 118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 119 } 120 return 0; 121 } 122 123 int snd_pcm_info_user(struct snd_pcm_substream *substream, 124 struct snd_pcm_info __user * _info) 125 { 126 struct snd_pcm_info *info; 127 int err; 128 129 info = kmalloc(sizeof(*info), GFP_KERNEL); 130 if (! info) 131 return -ENOMEM; 132 err = snd_pcm_info(substream, info); 133 if (err >= 0) { 134 if (copy_to_user(_info, info, sizeof(*info))) 135 err = -EFAULT; 136 } 137 kfree(info); 138 return err; 139 } 140 141 #undef RULES_DEBUG 142 143 #ifdef RULES_DEBUG 144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v 145 static const char * const snd_pcm_hw_param_names[] = { 146 HW_PARAM(ACCESS), 147 HW_PARAM(FORMAT), 148 HW_PARAM(SUBFORMAT), 149 HW_PARAM(SAMPLE_BITS), 150 HW_PARAM(FRAME_BITS), 151 HW_PARAM(CHANNELS), 152 HW_PARAM(RATE), 153 HW_PARAM(PERIOD_TIME), 154 HW_PARAM(PERIOD_SIZE), 155 HW_PARAM(PERIOD_BYTES), 156 HW_PARAM(PERIODS), 157 HW_PARAM(BUFFER_TIME), 158 HW_PARAM(BUFFER_SIZE), 159 HW_PARAM(BUFFER_BYTES), 160 HW_PARAM(TICK_TIME), 161 }; 162 #endif 163 164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 165 struct snd_pcm_hw_params *params) 166 { 167 unsigned int k; 168 struct snd_pcm_hardware *hw; 169 struct snd_interval *i = NULL; 170 struct snd_mask *m = NULL; 171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints; 172 unsigned int rstamps[constrs->rules_num]; 173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 174 unsigned int stamp = 2; 175 int changed, again; 176 177 params->info = 0; 178 params->fifo_size = 0; 179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 180 params->msbits = 0; 181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 182 params->rate_num = 0; 183 params->rate_den = 0; 184 } 185 186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 187 m = hw_param_mask(params, k); 188 if (snd_mask_empty(m)) 189 return -EINVAL; 190 if (!(params->rmask & (1 << k))) 191 continue; 192 #ifdef RULES_DEBUG 193 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]); 194 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 195 #endif 196 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 197 #ifdef RULES_DEBUG 198 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 199 #endif 200 if (changed) 201 params->cmask |= 1 << k; 202 if (changed < 0) 203 return changed; 204 } 205 206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 207 i = hw_param_interval(params, k); 208 if (snd_interval_empty(i)) 209 return -EINVAL; 210 if (!(params->rmask & (1 << k))) 211 continue; 212 #ifdef RULES_DEBUG 213 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]); 214 if (i->empty) 215 printk("empty"); 216 else 217 printk("%c%u %u%c", 218 i->openmin ? '(' : '[', i->min, 219 i->max, i->openmax ? ')' : ']'); 220 printk(" -> "); 221 #endif 222 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 223 #ifdef RULES_DEBUG 224 if (i->empty) 225 printk("empty\n"); 226 else 227 printk("%c%u %u%c\n", 228 i->openmin ? '(' : '[', i->min, 229 i->max, i->openmax ? ')' : ']'); 230 #endif 231 if (changed) 232 params->cmask |= 1 << k; 233 if (changed < 0) 234 return changed; 235 } 236 237 for (k = 0; k < constrs->rules_num; k++) 238 rstamps[k] = 0; 239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 241 do { 242 again = 0; 243 for (k = 0; k < constrs->rules_num; k++) { 244 struct snd_pcm_hw_rule *r = &constrs->rules[k]; 245 unsigned int d; 246 int doit = 0; 247 if (r->cond && !(r->cond & params->flags)) 248 continue; 249 for (d = 0; r->deps[d] >= 0; d++) { 250 if (vstamps[r->deps[d]] > rstamps[k]) { 251 doit = 1; 252 break; 253 } 254 } 255 if (!doit) 256 continue; 257 #ifdef RULES_DEBUG 258 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func); 259 if (r->var >= 0) { 260 printk("%s = ", snd_pcm_hw_param_names[r->var]); 261 if (hw_is_mask(r->var)) { 262 m = hw_param_mask(params, r->var); 263 printk("%x", *m->bits); 264 } else { 265 i = hw_param_interval(params, r->var); 266 if (i->empty) 267 printk("empty"); 268 else 269 printk("%c%u %u%c", 270 i->openmin ? '(' : '[', i->min, 271 i->max, i->openmax ? ')' : ']'); 272 } 273 } 274 #endif 275 changed = r->func(params, r); 276 #ifdef RULES_DEBUG 277 if (r->var >= 0) { 278 printk(" -> "); 279 if (hw_is_mask(r->var)) 280 printk("%x", *m->bits); 281 else { 282 if (i->empty) 283 printk("empty"); 284 else 285 printk("%c%u %u%c", 286 i->openmin ? '(' : '[', i->min, 287 i->max, i->openmax ? ')' : ']'); 288 } 289 } 290 printk("\n"); 291 #endif 292 rstamps[k] = stamp; 293 if (changed && r->var >= 0) { 294 params->cmask |= (1 << r->var); 295 vstamps[r->var] = stamp; 296 again = 1; 297 } 298 if (changed < 0) 299 return changed; 300 stamp++; 301 } 302 } while (again); 303 if (!params->msbits) { 304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 305 if (snd_interval_single(i)) 306 params->msbits = snd_interval_value(i); 307 } 308 309 if (!params->rate_den) { 310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 311 if (snd_interval_single(i)) { 312 params->rate_num = snd_interval_value(i); 313 params->rate_den = 1; 314 } 315 } 316 317 hw = &substream->runtime->hw; 318 if (!params->info) 319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES; 320 if (!params->fifo_size) { 321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 323 if (snd_mask_min(m) == snd_mask_max(m) && 324 snd_interval_min(i) == snd_interval_max(i)) { 325 changed = substream->ops->ioctl(substream, 326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 327 if (changed < 0) 328 return changed; 329 } 330 } 331 params->rmask = 0; 332 return 0; 333 } 334 335 EXPORT_SYMBOL(snd_pcm_hw_refine); 336 337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 338 struct snd_pcm_hw_params __user * _params) 339 { 340 struct snd_pcm_hw_params *params; 341 int err; 342 343 params = memdup_user(_params, sizeof(*params)); 344 if (IS_ERR(params)) 345 return PTR_ERR(params); 346 347 err = snd_pcm_hw_refine(substream, params); 348 if (copy_to_user(_params, params, sizeof(*params))) { 349 if (!err) 350 err = -EFAULT; 351 } 352 353 kfree(params); 354 return err; 355 } 356 357 static int period_to_usecs(struct snd_pcm_runtime *runtime) 358 { 359 int usecs; 360 361 if (! runtime->rate) 362 return -1; /* invalid */ 363 364 /* take 75% of period time as the deadline */ 365 usecs = (750000 / runtime->rate) * runtime->period_size; 366 usecs += ((750000 % runtime->rate) * runtime->period_size) / 367 runtime->rate; 368 369 return usecs; 370 } 371 372 static void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 373 { 374 snd_pcm_stream_lock_irq(substream); 375 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 376 substream->runtime->status->state = state; 377 snd_pcm_stream_unlock_irq(substream); 378 } 379 380 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 381 struct snd_pcm_hw_params *params) 382 { 383 struct snd_pcm_runtime *runtime; 384 int err, usecs; 385 unsigned int bits; 386 snd_pcm_uframes_t frames; 387 388 if (PCM_RUNTIME_CHECK(substream)) 389 return -ENXIO; 390 runtime = substream->runtime; 391 snd_pcm_stream_lock_irq(substream); 392 switch (runtime->status->state) { 393 case SNDRV_PCM_STATE_OPEN: 394 case SNDRV_PCM_STATE_SETUP: 395 case SNDRV_PCM_STATE_PREPARED: 396 break; 397 default: 398 snd_pcm_stream_unlock_irq(substream); 399 return -EBADFD; 400 } 401 snd_pcm_stream_unlock_irq(substream); 402 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 403 if (!substream->oss.oss) 404 #endif 405 if (atomic_read(&substream->mmap_count)) 406 return -EBADFD; 407 408 params->rmask = ~0U; 409 err = snd_pcm_hw_refine(substream, params); 410 if (err < 0) 411 goto _error; 412 413 err = snd_pcm_hw_params_choose(substream, params); 414 if (err < 0) 415 goto _error; 416 417 if (substream->ops->hw_params != NULL) { 418 err = substream->ops->hw_params(substream, params); 419 if (err < 0) 420 goto _error; 421 } 422 423 runtime->access = params_access(params); 424 runtime->format = params_format(params); 425 runtime->subformat = params_subformat(params); 426 runtime->channels = params_channels(params); 427 runtime->rate = params_rate(params); 428 runtime->period_size = params_period_size(params); 429 runtime->periods = params_periods(params); 430 runtime->buffer_size = params_buffer_size(params); 431 runtime->info = params->info; 432 runtime->rate_num = params->rate_num; 433 runtime->rate_den = params->rate_den; 434 runtime->no_period_wakeup = 435 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 436 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 437 438 bits = snd_pcm_format_physical_width(runtime->format); 439 runtime->sample_bits = bits; 440 bits *= runtime->channels; 441 runtime->frame_bits = bits; 442 frames = 1; 443 while (bits % 8 != 0) { 444 bits *= 2; 445 frames *= 2; 446 } 447 runtime->byte_align = bits / 8; 448 runtime->min_align = frames; 449 450 /* Default sw params */ 451 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 452 runtime->period_step = 1; 453 runtime->control->avail_min = runtime->period_size; 454 runtime->start_threshold = 1; 455 runtime->stop_threshold = runtime->buffer_size; 456 runtime->silence_threshold = 0; 457 runtime->silence_size = 0; 458 runtime->boundary = runtime->buffer_size; 459 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 460 runtime->boundary *= 2; 461 462 snd_pcm_timer_resolution_change(substream); 463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 464 465 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 466 pm_qos_remove_request(&substream->latency_pm_qos_req); 467 if ((usecs = period_to_usecs(runtime)) >= 0) 468 pm_qos_add_request(&substream->latency_pm_qos_req, 469 PM_QOS_CPU_DMA_LATENCY, usecs); 470 return 0; 471 _error: 472 /* hardware might be unusable from this time, 473 so we force application to retry to set 474 the correct hardware parameter settings */ 475 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 476 if (substream->ops->hw_free != NULL) 477 substream->ops->hw_free(substream); 478 return err; 479 } 480 481 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 482 struct snd_pcm_hw_params __user * _params) 483 { 484 struct snd_pcm_hw_params *params; 485 int err; 486 487 params = memdup_user(_params, sizeof(*params)); 488 if (IS_ERR(params)) 489 return PTR_ERR(params); 490 491 err = snd_pcm_hw_params(substream, params); 492 if (copy_to_user(_params, params, sizeof(*params))) { 493 if (!err) 494 err = -EFAULT; 495 } 496 497 kfree(params); 498 return err; 499 } 500 501 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 502 { 503 struct snd_pcm_runtime *runtime; 504 int result = 0; 505 506 if (PCM_RUNTIME_CHECK(substream)) 507 return -ENXIO; 508 runtime = substream->runtime; 509 snd_pcm_stream_lock_irq(substream); 510 switch (runtime->status->state) { 511 case SNDRV_PCM_STATE_SETUP: 512 case SNDRV_PCM_STATE_PREPARED: 513 break; 514 default: 515 snd_pcm_stream_unlock_irq(substream); 516 return -EBADFD; 517 } 518 snd_pcm_stream_unlock_irq(substream); 519 if (atomic_read(&substream->mmap_count)) 520 return -EBADFD; 521 if (substream->ops->hw_free) 522 result = substream->ops->hw_free(substream); 523 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 524 pm_qos_remove_request(&substream->latency_pm_qos_req); 525 return result; 526 } 527 528 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 529 struct snd_pcm_sw_params *params) 530 { 531 struct snd_pcm_runtime *runtime; 532 int err; 533 534 if (PCM_RUNTIME_CHECK(substream)) 535 return -ENXIO; 536 runtime = substream->runtime; 537 snd_pcm_stream_lock_irq(substream); 538 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 539 snd_pcm_stream_unlock_irq(substream); 540 return -EBADFD; 541 } 542 snd_pcm_stream_unlock_irq(substream); 543 544 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 545 return -EINVAL; 546 if (params->avail_min == 0) 547 return -EINVAL; 548 if (params->silence_size >= runtime->boundary) { 549 if (params->silence_threshold != 0) 550 return -EINVAL; 551 } else { 552 if (params->silence_size > params->silence_threshold) 553 return -EINVAL; 554 if (params->silence_threshold > runtime->buffer_size) 555 return -EINVAL; 556 } 557 err = 0; 558 snd_pcm_stream_lock_irq(substream); 559 runtime->tstamp_mode = params->tstamp_mode; 560 runtime->period_step = params->period_step; 561 runtime->control->avail_min = params->avail_min; 562 runtime->start_threshold = params->start_threshold; 563 runtime->stop_threshold = params->stop_threshold; 564 runtime->silence_threshold = params->silence_threshold; 565 runtime->silence_size = params->silence_size; 566 params->boundary = runtime->boundary; 567 if (snd_pcm_running(substream)) { 568 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 569 runtime->silence_size > 0) 570 snd_pcm_playback_silence(substream, ULONG_MAX); 571 err = snd_pcm_update_state(substream, runtime); 572 } 573 snd_pcm_stream_unlock_irq(substream); 574 return err; 575 } 576 577 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 578 struct snd_pcm_sw_params __user * _params) 579 { 580 struct snd_pcm_sw_params params; 581 int err; 582 if (copy_from_user(¶ms, _params, sizeof(params))) 583 return -EFAULT; 584 err = snd_pcm_sw_params(substream, ¶ms); 585 if (copy_to_user(_params, ¶ms, sizeof(params))) 586 return -EFAULT; 587 return err; 588 } 589 590 int snd_pcm_status(struct snd_pcm_substream *substream, 591 struct snd_pcm_status *status) 592 { 593 struct snd_pcm_runtime *runtime = substream->runtime; 594 595 snd_pcm_stream_lock_irq(substream); 596 status->state = runtime->status->state; 597 status->suspended_state = runtime->status->suspended_state; 598 if (status->state == SNDRV_PCM_STATE_OPEN) 599 goto _end; 600 status->trigger_tstamp = runtime->trigger_tstamp; 601 if (snd_pcm_running(substream)) { 602 snd_pcm_update_hw_ptr(substream); 603 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 604 status->tstamp = runtime->status->tstamp; 605 status->audio_tstamp = 606 runtime->status->audio_tstamp; 607 goto _tstamp_end; 608 } 609 } 610 snd_pcm_gettime(runtime, &status->tstamp); 611 _tstamp_end: 612 status->appl_ptr = runtime->control->appl_ptr; 613 status->hw_ptr = runtime->status->hw_ptr; 614 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 615 status->avail = snd_pcm_playback_avail(runtime); 616 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 617 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 618 status->delay = runtime->buffer_size - status->avail; 619 status->delay += runtime->delay; 620 } else 621 status->delay = 0; 622 } else { 623 status->avail = snd_pcm_capture_avail(runtime); 624 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 625 status->delay = status->avail + runtime->delay; 626 else 627 status->delay = 0; 628 } 629 status->avail_max = runtime->avail_max; 630 status->overrange = runtime->overrange; 631 runtime->avail_max = 0; 632 runtime->overrange = 0; 633 _end: 634 snd_pcm_stream_unlock_irq(substream); 635 return 0; 636 } 637 638 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 639 struct snd_pcm_status __user * _status) 640 { 641 struct snd_pcm_status status; 642 int res; 643 644 memset(&status, 0, sizeof(status)); 645 res = snd_pcm_status(substream, &status); 646 if (res < 0) 647 return res; 648 if (copy_to_user(_status, &status, sizeof(status))) 649 return -EFAULT; 650 return 0; 651 } 652 653 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 654 struct snd_pcm_channel_info * info) 655 { 656 struct snd_pcm_runtime *runtime; 657 unsigned int channel; 658 659 channel = info->channel; 660 runtime = substream->runtime; 661 snd_pcm_stream_lock_irq(substream); 662 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 663 snd_pcm_stream_unlock_irq(substream); 664 return -EBADFD; 665 } 666 snd_pcm_stream_unlock_irq(substream); 667 if (channel >= runtime->channels) 668 return -EINVAL; 669 memset(info, 0, sizeof(*info)); 670 info->channel = channel; 671 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 672 } 673 674 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 675 struct snd_pcm_channel_info __user * _info) 676 { 677 struct snd_pcm_channel_info info; 678 int res; 679 680 if (copy_from_user(&info, _info, sizeof(info))) 681 return -EFAULT; 682 res = snd_pcm_channel_info(substream, &info); 683 if (res < 0) 684 return res; 685 if (copy_to_user(_info, &info, sizeof(info))) 686 return -EFAULT; 687 return 0; 688 } 689 690 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 691 { 692 struct snd_pcm_runtime *runtime = substream->runtime; 693 if (runtime->trigger_master == NULL) 694 return; 695 if (runtime->trigger_master == substream) { 696 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 697 } else { 698 snd_pcm_trigger_tstamp(runtime->trigger_master); 699 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 700 } 701 runtime->trigger_master = NULL; 702 } 703 704 struct action_ops { 705 int (*pre_action)(struct snd_pcm_substream *substream, int state); 706 int (*do_action)(struct snd_pcm_substream *substream, int state); 707 void (*undo_action)(struct snd_pcm_substream *substream, int state); 708 void (*post_action)(struct snd_pcm_substream *substream, int state); 709 }; 710 711 /* 712 * this functions is core for handling of linked stream 713 * Note: the stream state might be changed also on failure 714 * Note2: call with calling stream lock + link lock 715 */ 716 static int snd_pcm_action_group(struct action_ops *ops, 717 struct snd_pcm_substream *substream, 718 int state, int do_lock) 719 { 720 struct snd_pcm_substream *s = NULL; 721 struct snd_pcm_substream *s1; 722 int res = 0; 723 724 snd_pcm_group_for_each_entry(s, substream) { 725 if (do_lock && s != substream) 726 spin_lock_nested(&s->self_group.lock, 727 SINGLE_DEPTH_NESTING); 728 res = ops->pre_action(s, state); 729 if (res < 0) 730 goto _unlock; 731 } 732 snd_pcm_group_for_each_entry(s, substream) { 733 res = ops->do_action(s, state); 734 if (res < 0) { 735 if (ops->undo_action) { 736 snd_pcm_group_for_each_entry(s1, substream) { 737 if (s1 == s) /* failed stream */ 738 break; 739 ops->undo_action(s1, state); 740 } 741 } 742 s = NULL; /* unlock all */ 743 goto _unlock; 744 } 745 } 746 snd_pcm_group_for_each_entry(s, substream) { 747 ops->post_action(s, state); 748 } 749 _unlock: 750 if (do_lock) { 751 /* unlock streams */ 752 snd_pcm_group_for_each_entry(s1, substream) { 753 if (s1 != substream) 754 spin_unlock(&s1->self_group.lock); 755 if (s1 == s) /* end */ 756 break; 757 } 758 } 759 return res; 760 } 761 762 /* 763 * Note: call with stream lock 764 */ 765 static int snd_pcm_action_single(struct action_ops *ops, 766 struct snd_pcm_substream *substream, 767 int state) 768 { 769 int res; 770 771 res = ops->pre_action(substream, state); 772 if (res < 0) 773 return res; 774 res = ops->do_action(substream, state); 775 if (res == 0) 776 ops->post_action(substream, state); 777 else if (ops->undo_action) 778 ops->undo_action(substream, state); 779 return res; 780 } 781 782 /* 783 * Note: call with stream lock 784 */ 785 static int snd_pcm_action(struct action_ops *ops, 786 struct snd_pcm_substream *substream, 787 int state) 788 { 789 int res; 790 791 if (snd_pcm_stream_linked(substream)) { 792 if (!spin_trylock(&substream->group->lock)) { 793 spin_unlock(&substream->self_group.lock); 794 spin_lock(&substream->group->lock); 795 spin_lock(&substream->self_group.lock); 796 } 797 res = snd_pcm_action_group(ops, substream, state, 1); 798 spin_unlock(&substream->group->lock); 799 } else { 800 res = snd_pcm_action_single(ops, substream, state); 801 } 802 return res; 803 } 804 805 /* 806 * Note: don't use any locks before 807 */ 808 static int snd_pcm_action_lock_irq(struct action_ops *ops, 809 struct snd_pcm_substream *substream, 810 int state) 811 { 812 int res; 813 814 read_lock_irq(&snd_pcm_link_rwlock); 815 if (snd_pcm_stream_linked(substream)) { 816 spin_lock(&substream->group->lock); 817 spin_lock(&substream->self_group.lock); 818 res = snd_pcm_action_group(ops, substream, state, 1); 819 spin_unlock(&substream->self_group.lock); 820 spin_unlock(&substream->group->lock); 821 } else { 822 spin_lock(&substream->self_group.lock); 823 res = snd_pcm_action_single(ops, substream, state); 824 spin_unlock(&substream->self_group.lock); 825 } 826 read_unlock_irq(&snd_pcm_link_rwlock); 827 return res; 828 } 829 830 /* 831 */ 832 static int snd_pcm_action_nonatomic(struct action_ops *ops, 833 struct snd_pcm_substream *substream, 834 int state) 835 { 836 int res; 837 838 down_read(&snd_pcm_link_rwsem); 839 if (snd_pcm_stream_linked(substream)) 840 res = snd_pcm_action_group(ops, substream, state, 0); 841 else 842 res = snd_pcm_action_single(ops, substream, state); 843 up_read(&snd_pcm_link_rwsem); 844 return res; 845 } 846 847 /* 848 * start callbacks 849 */ 850 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 851 { 852 struct snd_pcm_runtime *runtime = substream->runtime; 853 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 854 return -EBADFD; 855 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 856 !snd_pcm_playback_data(substream)) 857 return -EPIPE; 858 runtime->trigger_master = substream; 859 return 0; 860 } 861 862 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 863 { 864 if (substream->runtime->trigger_master != substream) 865 return 0; 866 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 867 } 868 869 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 870 { 871 if (substream->runtime->trigger_master == substream) 872 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 873 } 874 875 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 876 { 877 struct snd_pcm_runtime *runtime = substream->runtime; 878 snd_pcm_trigger_tstamp(substream); 879 runtime->hw_ptr_jiffies = jiffies; 880 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 881 runtime->rate; 882 runtime->status->state = state; 883 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 884 runtime->silence_size > 0) 885 snd_pcm_playback_silence(substream, ULONG_MAX); 886 if (substream->timer) 887 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, 888 &runtime->trigger_tstamp); 889 } 890 891 static struct action_ops snd_pcm_action_start = { 892 .pre_action = snd_pcm_pre_start, 893 .do_action = snd_pcm_do_start, 894 .undo_action = snd_pcm_undo_start, 895 .post_action = snd_pcm_post_start 896 }; 897 898 /** 899 * snd_pcm_start - start all linked streams 900 * @substream: the PCM substream instance 901 * 902 * Return: Zero if successful, or a negative error code. 903 */ 904 int snd_pcm_start(struct snd_pcm_substream *substream) 905 { 906 return snd_pcm_action(&snd_pcm_action_start, substream, 907 SNDRV_PCM_STATE_RUNNING); 908 } 909 910 /* 911 * stop callbacks 912 */ 913 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 914 { 915 struct snd_pcm_runtime *runtime = substream->runtime; 916 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 917 return -EBADFD; 918 runtime->trigger_master = substream; 919 return 0; 920 } 921 922 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 923 { 924 if (substream->runtime->trigger_master == substream && 925 snd_pcm_running(substream)) 926 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 927 return 0; /* unconditonally stop all substreams */ 928 } 929 930 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 931 { 932 struct snd_pcm_runtime *runtime = substream->runtime; 933 if (runtime->status->state != state) { 934 snd_pcm_trigger_tstamp(substream); 935 if (substream->timer) 936 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 937 &runtime->trigger_tstamp); 938 runtime->status->state = state; 939 } 940 wake_up(&runtime->sleep); 941 wake_up(&runtime->tsleep); 942 } 943 944 static struct action_ops snd_pcm_action_stop = { 945 .pre_action = snd_pcm_pre_stop, 946 .do_action = snd_pcm_do_stop, 947 .post_action = snd_pcm_post_stop 948 }; 949 950 /** 951 * snd_pcm_stop - try to stop all running streams in the substream group 952 * @substream: the PCM substream instance 953 * @state: PCM state after stopping the stream 954 * 955 * The state of each stream is then changed to the given state unconditionally. 956 * 957 * Return: Zero if succesful, or a negative error code. 958 */ 959 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 960 { 961 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 962 } 963 964 EXPORT_SYMBOL(snd_pcm_stop); 965 966 /** 967 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 968 * @substream: the PCM substream 969 * 970 * After stopping, the state is changed to SETUP. 971 * Unlike snd_pcm_stop(), this affects only the given stream. 972 * 973 * Return: Zero if succesful, or a negative error code. 974 */ 975 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 976 { 977 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 978 SNDRV_PCM_STATE_SETUP); 979 } 980 981 /* 982 * pause callbacks 983 */ 984 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 985 { 986 struct snd_pcm_runtime *runtime = substream->runtime; 987 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 988 return -ENOSYS; 989 if (push) { 990 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 991 return -EBADFD; 992 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 993 return -EBADFD; 994 runtime->trigger_master = substream; 995 return 0; 996 } 997 998 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 999 { 1000 if (substream->runtime->trigger_master != substream) 1001 return 0; 1002 /* some drivers might use hw_ptr to recover from the pause - 1003 update the hw_ptr now */ 1004 if (push) 1005 snd_pcm_update_hw_ptr(substream); 1006 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1007 * a delta between the current jiffies, this gives a large enough 1008 * delta, effectively to skip the check once. 1009 */ 1010 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1011 return substream->ops->trigger(substream, 1012 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1013 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1014 } 1015 1016 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1017 { 1018 if (substream->runtime->trigger_master == substream) 1019 substream->ops->trigger(substream, 1020 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1021 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1022 } 1023 1024 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1025 { 1026 struct snd_pcm_runtime *runtime = substream->runtime; 1027 snd_pcm_trigger_tstamp(substream); 1028 if (push) { 1029 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1030 if (substream->timer) 1031 snd_timer_notify(substream->timer, 1032 SNDRV_TIMER_EVENT_MPAUSE, 1033 &runtime->trigger_tstamp); 1034 wake_up(&runtime->sleep); 1035 wake_up(&runtime->tsleep); 1036 } else { 1037 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1038 if (substream->timer) 1039 snd_timer_notify(substream->timer, 1040 SNDRV_TIMER_EVENT_MCONTINUE, 1041 &runtime->trigger_tstamp); 1042 } 1043 } 1044 1045 static struct action_ops snd_pcm_action_pause = { 1046 .pre_action = snd_pcm_pre_pause, 1047 .do_action = snd_pcm_do_pause, 1048 .undo_action = snd_pcm_undo_pause, 1049 .post_action = snd_pcm_post_pause 1050 }; 1051 1052 /* 1053 * Push/release the pause for all linked streams. 1054 */ 1055 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1056 { 1057 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1058 } 1059 1060 #ifdef CONFIG_PM 1061 /* suspend */ 1062 1063 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1064 { 1065 struct snd_pcm_runtime *runtime = substream->runtime; 1066 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1067 return -EBUSY; 1068 runtime->trigger_master = substream; 1069 return 0; 1070 } 1071 1072 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1073 { 1074 struct snd_pcm_runtime *runtime = substream->runtime; 1075 if (runtime->trigger_master != substream) 1076 return 0; 1077 if (! snd_pcm_running(substream)) 1078 return 0; 1079 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1080 return 0; /* suspend unconditionally */ 1081 } 1082 1083 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1084 { 1085 struct snd_pcm_runtime *runtime = substream->runtime; 1086 snd_pcm_trigger_tstamp(substream); 1087 if (substream->timer) 1088 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1089 &runtime->trigger_tstamp); 1090 runtime->status->suspended_state = runtime->status->state; 1091 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1092 wake_up(&runtime->sleep); 1093 wake_up(&runtime->tsleep); 1094 } 1095 1096 static struct action_ops snd_pcm_action_suspend = { 1097 .pre_action = snd_pcm_pre_suspend, 1098 .do_action = snd_pcm_do_suspend, 1099 .post_action = snd_pcm_post_suspend 1100 }; 1101 1102 /** 1103 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1104 * @substream: the PCM substream 1105 * 1106 * After this call, all streams are changed to SUSPENDED state. 1107 * 1108 * Return: Zero if successful (or @substream is %NULL), or a negative error 1109 * code. 1110 */ 1111 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1112 { 1113 int err; 1114 unsigned long flags; 1115 1116 if (! substream) 1117 return 0; 1118 1119 snd_pcm_stream_lock_irqsave(substream, flags); 1120 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1121 snd_pcm_stream_unlock_irqrestore(substream, flags); 1122 return err; 1123 } 1124 1125 EXPORT_SYMBOL(snd_pcm_suspend); 1126 1127 /** 1128 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1129 * @pcm: the PCM instance 1130 * 1131 * After this call, all streams are changed to SUSPENDED state. 1132 * 1133 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1134 */ 1135 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1136 { 1137 struct snd_pcm_substream *substream; 1138 int stream, err = 0; 1139 1140 if (! pcm) 1141 return 0; 1142 1143 for (stream = 0; stream < 2; stream++) { 1144 for (substream = pcm->streams[stream].substream; 1145 substream; substream = substream->next) { 1146 /* FIXME: the open/close code should lock this as well */ 1147 if (substream->runtime == NULL) 1148 continue; 1149 err = snd_pcm_suspend(substream); 1150 if (err < 0 && err != -EBUSY) 1151 return err; 1152 } 1153 } 1154 return 0; 1155 } 1156 1157 EXPORT_SYMBOL(snd_pcm_suspend_all); 1158 1159 /* resume */ 1160 1161 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1162 { 1163 struct snd_pcm_runtime *runtime = substream->runtime; 1164 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1165 return -ENOSYS; 1166 runtime->trigger_master = substream; 1167 return 0; 1168 } 1169 1170 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1171 { 1172 struct snd_pcm_runtime *runtime = substream->runtime; 1173 if (runtime->trigger_master != substream) 1174 return 0; 1175 /* DMA not running previously? */ 1176 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1177 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1178 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1179 return 0; 1180 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1181 } 1182 1183 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1184 { 1185 if (substream->runtime->trigger_master == substream && 1186 snd_pcm_running(substream)) 1187 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1188 } 1189 1190 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1191 { 1192 struct snd_pcm_runtime *runtime = substream->runtime; 1193 snd_pcm_trigger_tstamp(substream); 1194 if (substream->timer) 1195 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1196 &runtime->trigger_tstamp); 1197 runtime->status->state = runtime->status->suspended_state; 1198 } 1199 1200 static struct action_ops snd_pcm_action_resume = { 1201 .pre_action = snd_pcm_pre_resume, 1202 .do_action = snd_pcm_do_resume, 1203 .undo_action = snd_pcm_undo_resume, 1204 .post_action = snd_pcm_post_resume 1205 }; 1206 1207 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1208 { 1209 struct snd_card *card = substream->pcm->card; 1210 int res; 1211 1212 snd_power_lock(card); 1213 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1214 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1215 snd_power_unlock(card); 1216 return res; 1217 } 1218 1219 #else 1220 1221 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1222 { 1223 return -ENOSYS; 1224 } 1225 1226 #endif /* CONFIG_PM */ 1227 1228 /* 1229 * xrun ioctl 1230 * 1231 * Change the RUNNING stream(s) to XRUN state. 1232 */ 1233 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1234 { 1235 struct snd_card *card = substream->pcm->card; 1236 struct snd_pcm_runtime *runtime = substream->runtime; 1237 int result; 1238 1239 snd_power_lock(card); 1240 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1241 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1242 if (result < 0) 1243 goto _unlock; 1244 } 1245 1246 snd_pcm_stream_lock_irq(substream); 1247 switch (runtime->status->state) { 1248 case SNDRV_PCM_STATE_XRUN: 1249 result = 0; /* already there */ 1250 break; 1251 case SNDRV_PCM_STATE_RUNNING: 1252 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1253 break; 1254 default: 1255 result = -EBADFD; 1256 } 1257 snd_pcm_stream_unlock_irq(substream); 1258 _unlock: 1259 snd_power_unlock(card); 1260 return result; 1261 } 1262 1263 /* 1264 * reset ioctl 1265 */ 1266 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1267 { 1268 struct snd_pcm_runtime *runtime = substream->runtime; 1269 switch (runtime->status->state) { 1270 case SNDRV_PCM_STATE_RUNNING: 1271 case SNDRV_PCM_STATE_PREPARED: 1272 case SNDRV_PCM_STATE_PAUSED: 1273 case SNDRV_PCM_STATE_SUSPENDED: 1274 return 0; 1275 default: 1276 return -EBADFD; 1277 } 1278 } 1279 1280 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1281 { 1282 struct snd_pcm_runtime *runtime = substream->runtime; 1283 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1284 if (err < 0) 1285 return err; 1286 runtime->hw_ptr_base = 0; 1287 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1288 runtime->status->hw_ptr % runtime->period_size; 1289 runtime->silence_start = runtime->status->hw_ptr; 1290 runtime->silence_filled = 0; 1291 return 0; 1292 } 1293 1294 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1295 { 1296 struct snd_pcm_runtime *runtime = substream->runtime; 1297 runtime->control->appl_ptr = runtime->status->hw_ptr; 1298 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1299 runtime->silence_size > 0) 1300 snd_pcm_playback_silence(substream, ULONG_MAX); 1301 } 1302 1303 static struct action_ops snd_pcm_action_reset = { 1304 .pre_action = snd_pcm_pre_reset, 1305 .do_action = snd_pcm_do_reset, 1306 .post_action = snd_pcm_post_reset 1307 }; 1308 1309 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1310 { 1311 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1312 } 1313 1314 /* 1315 * prepare ioctl 1316 */ 1317 /* we use the second argument for updating f_flags */ 1318 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1319 int f_flags) 1320 { 1321 struct snd_pcm_runtime *runtime = substream->runtime; 1322 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1323 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1324 return -EBADFD; 1325 if (snd_pcm_running(substream)) 1326 return -EBUSY; 1327 substream->f_flags = f_flags; 1328 return 0; 1329 } 1330 1331 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1332 { 1333 int err; 1334 err = substream->ops->prepare(substream); 1335 if (err < 0) 1336 return err; 1337 return snd_pcm_do_reset(substream, 0); 1338 } 1339 1340 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1341 { 1342 struct snd_pcm_runtime *runtime = substream->runtime; 1343 runtime->control->appl_ptr = runtime->status->hw_ptr; 1344 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1345 } 1346 1347 static struct action_ops snd_pcm_action_prepare = { 1348 .pre_action = snd_pcm_pre_prepare, 1349 .do_action = snd_pcm_do_prepare, 1350 .post_action = snd_pcm_post_prepare 1351 }; 1352 1353 /** 1354 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1355 * @substream: the PCM substream instance 1356 * @file: file to refer f_flags 1357 * 1358 * Return: Zero if successful, or a negative error code. 1359 */ 1360 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1361 struct file *file) 1362 { 1363 int res; 1364 struct snd_card *card = substream->pcm->card; 1365 int f_flags; 1366 1367 if (file) 1368 f_flags = file->f_flags; 1369 else 1370 f_flags = substream->f_flags; 1371 1372 snd_power_lock(card); 1373 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1374 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1375 substream, f_flags); 1376 snd_power_unlock(card); 1377 return res; 1378 } 1379 1380 /* 1381 * drain ioctl 1382 */ 1383 1384 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1385 { 1386 struct snd_pcm_runtime *runtime = substream->runtime; 1387 switch (runtime->status->state) { 1388 case SNDRV_PCM_STATE_OPEN: 1389 case SNDRV_PCM_STATE_DISCONNECTED: 1390 case SNDRV_PCM_STATE_SUSPENDED: 1391 return -EBADFD; 1392 } 1393 runtime->trigger_master = substream; 1394 return 0; 1395 } 1396 1397 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1398 { 1399 struct snd_pcm_runtime *runtime = substream->runtime; 1400 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1401 switch (runtime->status->state) { 1402 case SNDRV_PCM_STATE_PREPARED: 1403 /* start playback stream if possible */ 1404 if (! snd_pcm_playback_empty(substream)) { 1405 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1406 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1407 } 1408 break; 1409 case SNDRV_PCM_STATE_RUNNING: 1410 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1411 break; 1412 case SNDRV_PCM_STATE_XRUN: 1413 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1414 break; 1415 default: 1416 break; 1417 } 1418 } else { 1419 /* stop running stream */ 1420 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1421 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1422 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1423 snd_pcm_do_stop(substream, new_state); 1424 snd_pcm_post_stop(substream, new_state); 1425 } 1426 } 1427 return 0; 1428 } 1429 1430 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1431 { 1432 } 1433 1434 static struct action_ops snd_pcm_action_drain_init = { 1435 .pre_action = snd_pcm_pre_drain_init, 1436 .do_action = snd_pcm_do_drain_init, 1437 .post_action = snd_pcm_post_drain_init 1438 }; 1439 1440 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1441 1442 /* 1443 * Drain the stream(s). 1444 * When the substream is linked, sync until the draining of all playback streams 1445 * is finished. 1446 * After this call, all streams are supposed to be either SETUP or DRAINING 1447 * (capture only) state. 1448 */ 1449 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1450 struct file *file) 1451 { 1452 struct snd_card *card; 1453 struct snd_pcm_runtime *runtime; 1454 struct snd_pcm_substream *s; 1455 wait_queue_t wait; 1456 int result = 0; 1457 int nonblock = 0; 1458 1459 card = substream->pcm->card; 1460 runtime = substream->runtime; 1461 1462 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1463 return -EBADFD; 1464 1465 snd_power_lock(card); 1466 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1467 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1468 if (result < 0) { 1469 snd_power_unlock(card); 1470 return result; 1471 } 1472 } 1473 1474 if (file) { 1475 if (file->f_flags & O_NONBLOCK) 1476 nonblock = 1; 1477 } else if (substream->f_flags & O_NONBLOCK) 1478 nonblock = 1; 1479 1480 down_read(&snd_pcm_link_rwsem); 1481 snd_pcm_stream_lock_irq(substream); 1482 /* resume pause */ 1483 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1484 snd_pcm_pause(substream, 0); 1485 1486 /* pre-start/stop - all running streams are changed to DRAINING state */ 1487 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1488 if (result < 0) 1489 goto unlock; 1490 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1491 if (nonblock) { 1492 result = -EAGAIN; 1493 goto unlock; 1494 } 1495 1496 for (;;) { 1497 long tout; 1498 struct snd_pcm_runtime *to_check; 1499 if (signal_pending(current)) { 1500 result = -ERESTARTSYS; 1501 break; 1502 } 1503 /* find a substream to drain */ 1504 to_check = NULL; 1505 snd_pcm_group_for_each_entry(s, substream) { 1506 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1507 continue; 1508 runtime = s->runtime; 1509 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1510 to_check = runtime; 1511 break; 1512 } 1513 } 1514 if (!to_check) 1515 break; /* all drained */ 1516 init_waitqueue_entry(&wait, current); 1517 add_wait_queue(&to_check->sleep, &wait); 1518 snd_pcm_stream_unlock_irq(substream); 1519 up_read(&snd_pcm_link_rwsem); 1520 snd_power_unlock(card); 1521 if (runtime->no_period_wakeup) 1522 tout = MAX_SCHEDULE_TIMEOUT; 1523 else { 1524 tout = 10; 1525 if (runtime->rate) { 1526 long t = runtime->period_size * 2 / runtime->rate; 1527 tout = max(t, tout); 1528 } 1529 tout = msecs_to_jiffies(tout * 1000); 1530 } 1531 tout = schedule_timeout_interruptible(tout); 1532 snd_power_lock(card); 1533 down_read(&snd_pcm_link_rwsem); 1534 snd_pcm_stream_lock_irq(substream); 1535 remove_wait_queue(&to_check->sleep, &wait); 1536 if (card->shutdown) { 1537 result = -ENODEV; 1538 break; 1539 } 1540 if (tout == 0) { 1541 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1542 result = -ESTRPIPE; 1543 else { 1544 snd_printd("playback drain error (DMA or IRQ trouble?)\n"); 1545 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1546 result = -EIO; 1547 } 1548 break; 1549 } 1550 } 1551 1552 unlock: 1553 snd_pcm_stream_unlock_irq(substream); 1554 up_read(&snd_pcm_link_rwsem); 1555 snd_power_unlock(card); 1556 1557 return result; 1558 } 1559 1560 /* 1561 * drop ioctl 1562 * 1563 * Immediately put all linked substreams into SETUP state. 1564 */ 1565 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1566 { 1567 struct snd_pcm_runtime *runtime; 1568 int result = 0; 1569 1570 if (PCM_RUNTIME_CHECK(substream)) 1571 return -ENXIO; 1572 runtime = substream->runtime; 1573 1574 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1575 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1576 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1577 return -EBADFD; 1578 1579 snd_pcm_stream_lock_irq(substream); 1580 /* resume pause */ 1581 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1582 snd_pcm_pause(substream, 0); 1583 1584 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1585 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1586 snd_pcm_stream_unlock_irq(substream); 1587 1588 return result; 1589 } 1590 1591 1592 static bool is_pcm_file(struct file *file) 1593 { 1594 struct inode *inode = file_inode(file); 1595 unsigned int minor; 1596 1597 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1598 return false; 1599 minor = iminor(inode); 1600 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1601 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1602 } 1603 1604 /* 1605 * PCM link handling 1606 */ 1607 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1608 { 1609 int res = 0; 1610 struct snd_pcm_file *pcm_file; 1611 struct snd_pcm_substream *substream1; 1612 struct snd_pcm_group *group; 1613 struct fd f = fdget(fd); 1614 1615 if (!f.file) 1616 return -EBADFD; 1617 if (!is_pcm_file(f.file)) { 1618 res = -EBADFD; 1619 goto _badf; 1620 } 1621 pcm_file = f.file->private_data; 1622 substream1 = pcm_file->substream; 1623 group = kmalloc(sizeof(*group), GFP_KERNEL); 1624 if (!group) { 1625 res = -ENOMEM; 1626 goto _nolock; 1627 } 1628 down_write(&snd_pcm_link_rwsem); 1629 write_lock_irq(&snd_pcm_link_rwlock); 1630 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1631 substream->runtime->status->state != substream1->runtime->status->state) { 1632 res = -EBADFD; 1633 goto _end; 1634 } 1635 if (snd_pcm_stream_linked(substream1)) { 1636 res = -EALREADY; 1637 goto _end; 1638 } 1639 if (!snd_pcm_stream_linked(substream)) { 1640 substream->group = group; 1641 group = NULL; 1642 spin_lock_init(&substream->group->lock); 1643 INIT_LIST_HEAD(&substream->group->substreams); 1644 list_add_tail(&substream->link_list, &substream->group->substreams); 1645 substream->group->count = 1; 1646 } 1647 list_add_tail(&substream1->link_list, &substream->group->substreams); 1648 substream->group->count++; 1649 substream1->group = substream->group; 1650 _end: 1651 write_unlock_irq(&snd_pcm_link_rwlock); 1652 up_write(&snd_pcm_link_rwsem); 1653 _nolock: 1654 snd_card_unref(substream1->pcm->card); 1655 kfree(group); 1656 _badf: 1657 fdput(f); 1658 return res; 1659 } 1660 1661 static void relink_to_local(struct snd_pcm_substream *substream) 1662 { 1663 substream->group = &substream->self_group; 1664 INIT_LIST_HEAD(&substream->self_group.substreams); 1665 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1666 } 1667 1668 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1669 { 1670 struct snd_pcm_substream *s; 1671 int res = 0; 1672 1673 down_write(&snd_pcm_link_rwsem); 1674 write_lock_irq(&snd_pcm_link_rwlock); 1675 if (!snd_pcm_stream_linked(substream)) { 1676 res = -EALREADY; 1677 goto _end; 1678 } 1679 list_del(&substream->link_list); 1680 substream->group->count--; 1681 if (substream->group->count == 1) { /* detach the last stream, too */ 1682 snd_pcm_group_for_each_entry(s, substream) { 1683 relink_to_local(s); 1684 break; 1685 } 1686 kfree(substream->group); 1687 } 1688 relink_to_local(substream); 1689 _end: 1690 write_unlock_irq(&snd_pcm_link_rwlock); 1691 up_write(&snd_pcm_link_rwsem); 1692 return res; 1693 } 1694 1695 /* 1696 * hw configurator 1697 */ 1698 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1699 struct snd_pcm_hw_rule *rule) 1700 { 1701 struct snd_interval t; 1702 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1703 hw_param_interval_c(params, rule->deps[1]), &t); 1704 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1705 } 1706 1707 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1708 struct snd_pcm_hw_rule *rule) 1709 { 1710 struct snd_interval t; 1711 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1712 hw_param_interval_c(params, rule->deps[1]), &t); 1713 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1714 } 1715 1716 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1717 struct snd_pcm_hw_rule *rule) 1718 { 1719 struct snd_interval t; 1720 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1721 hw_param_interval_c(params, rule->deps[1]), 1722 (unsigned long) rule->private, &t); 1723 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1724 } 1725 1726 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1727 struct snd_pcm_hw_rule *rule) 1728 { 1729 struct snd_interval t; 1730 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1731 (unsigned long) rule->private, 1732 hw_param_interval_c(params, rule->deps[1]), &t); 1733 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1734 } 1735 1736 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1737 struct snd_pcm_hw_rule *rule) 1738 { 1739 unsigned int k; 1740 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1741 struct snd_mask m; 1742 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1743 snd_mask_any(&m); 1744 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1745 int bits; 1746 if (! snd_mask_test(mask, k)) 1747 continue; 1748 bits = snd_pcm_format_physical_width(k); 1749 if (bits <= 0) 1750 continue; /* ignore invalid formats */ 1751 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1752 snd_mask_reset(&m, k); 1753 } 1754 return snd_mask_refine(mask, &m); 1755 } 1756 1757 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1758 struct snd_pcm_hw_rule *rule) 1759 { 1760 struct snd_interval t; 1761 unsigned int k; 1762 t.min = UINT_MAX; 1763 t.max = 0; 1764 t.openmin = 0; 1765 t.openmax = 0; 1766 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1767 int bits; 1768 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1769 continue; 1770 bits = snd_pcm_format_physical_width(k); 1771 if (bits <= 0) 1772 continue; /* ignore invalid formats */ 1773 if (t.min > (unsigned)bits) 1774 t.min = bits; 1775 if (t.max < (unsigned)bits) 1776 t.max = bits; 1777 } 1778 t.integer = 1; 1779 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1780 } 1781 1782 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1783 #error "Change this table" 1784 #endif 1785 1786 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1787 48000, 64000, 88200, 96000, 176400, 192000 }; 1788 1789 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1790 .count = ARRAY_SIZE(rates), 1791 .list = rates, 1792 }; 1793 1794 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1795 struct snd_pcm_hw_rule *rule) 1796 { 1797 struct snd_pcm_hardware *hw = rule->private; 1798 return snd_interval_list(hw_param_interval(params, rule->var), 1799 snd_pcm_known_rates.count, 1800 snd_pcm_known_rates.list, hw->rates); 1801 } 1802 1803 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1804 struct snd_pcm_hw_rule *rule) 1805 { 1806 struct snd_interval t; 1807 struct snd_pcm_substream *substream = rule->private; 1808 t.min = 0; 1809 t.max = substream->buffer_bytes_max; 1810 t.openmin = 0; 1811 t.openmax = 0; 1812 t.integer = 1; 1813 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1814 } 1815 1816 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1817 { 1818 struct snd_pcm_runtime *runtime = substream->runtime; 1819 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1820 int k, err; 1821 1822 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1823 snd_mask_any(constrs_mask(constrs, k)); 1824 } 1825 1826 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1827 snd_interval_any(constrs_interval(constrs, k)); 1828 } 1829 1830 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1831 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1832 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1833 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1834 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1835 1836 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1837 snd_pcm_hw_rule_format, NULL, 1838 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1839 if (err < 0) 1840 return err; 1841 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1842 snd_pcm_hw_rule_sample_bits, NULL, 1843 SNDRV_PCM_HW_PARAM_FORMAT, 1844 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1845 if (err < 0) 1846 return err; 1847 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1848 snd_pcm_hw_rule_div, NULL, 1849 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1850 if (err < 0) 1851 return err; 1852 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1853 snd_pcm_hw_rule_mul, NULL, 1854 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1855 if (err < 0) 1856 return err; 1857 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1858 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1859 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1860 if (err < 0) 1861 return err; 1862 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1863 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1864 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 1865 if (err < 0) 1866 return err; 1867 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1868 snd_pcm_hw_rule_div, NULL, 1869 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1870 if (err < 0) 1871 return err; 1872 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1873 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1874 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 1875 if (err < 0) 1876 return err; 1877 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1878 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1879 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 1880 if (err < 0) 1881 return err; 1882 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 1883 snd_pcm_hw_rule_div, NULL, 1884 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1885 if (err < 0) 1886 return err; 1887 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1888 snd_pcm_hw_rule_div, NULL, 1889 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1890 if (err < 0) 1891 return err; 1892 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1893 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1894 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1895 if (err < 0) 1896 return err; 1897 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1898 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1899 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1900 if (err < 0) 1901 return err; 1902 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1903 snd_pcm_hw_rule_mul, NULL, 1904 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1905 if (err < 0) 1906 return err; 1907 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1908 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1909 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1910 if (err < 0) 1911 return err; 1912 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1913 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1914 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1915 if (err < 0) 1916 return err; 1917 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1918 snd_pcm_hw_rule_muldivk, (void*) 8, 1919 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1920 if (err < 0) 1921 return err; 1922 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1923 snd_pcm_hw_rule_muldivk, (void*) 8, 1924 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1925 if (err < 0) 1926 return err; 1927 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1928 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1929 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1930 if (err < 0) 1931 return err; 1932 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 1933 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1934 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1935 if (err < 0) 1936 return err; 1937 return 0; 1938 } 1939 1940 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 1941 { 1942 struct snd_pcm_runtime *runtime = substream->runtime; 1943 struct snd_pcm_hardware *hw = &runtime->hw; 1944 int err; 1945 unsigned int mask = 0; 1946 1947 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1948 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 1949 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1950 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 1951 if (hw->info & SNDRV_PCM_INFO_MMAP) { 1952 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1953 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 1954 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1955 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 1956 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 1957 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 1958 } 1959 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 1960 if (err < 0) 1961 return err; 1962 1963 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 1964 if (err < 0) 1965 return err; 1966 1967 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 1968 if (err < 0) 1969 return err; 1970 1971 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 1972 hw->channels_min, hw->channels_max); 1973 if (err < 0) 1974 return err; 1975 1976 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 1977 hw->rate_min, hw->rate_max); 1978 if (err < 0) 1979 return err; 1980 1981 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1982 hw->period_bytes_min, hw->period_bytes_max); 1983 if (err < 0) 1984 return err; 1985 1986 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 1987 hw->periods_min, hw->periods_max); 1988 if (err < 0) 1989 return err; 1990 1991 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1992 hw->period_bytes_min, hw->buffer_bytes_max); 1993 if (err < 0) 1994 return err; 1995 1996 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1997 snd_pcm_hw_rule_buffer_bytes_max, substream, 1998 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 1999 if (err < 0) 2000 return err; 2001 2002 /* FIXME: remove */ 2003 if (runtime->dma_bytes) { 2004 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2005 if (err < 0) 2006 return err; 2007 } 2008 2009 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2010 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2011 snd_pcm_hw_rule_rate, hw, 2012 SNDRV_PCM_HW_PARAM_RATE, -1); 2013 if (err < 0) 2014 return err; 2015 } 2016 2017 /* FIXME: this belong to lowlevel */ 2018 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2019 2020 return 0; 2021 } 2022 2023 static void pcm_release_private(struct snd_pcm_substream *substream) 2024 { 2025 snd_pcm_unlink(substream); 2026 } 2027 2028 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2029 { 2030 substream->ref_count--; 2031 if (substream->ref_count > 0) 2032 return; 2033 2034 snd_pcm_drop(substream); 2035 if (substream->hw_opened) { 2036 if (substream->ops->hw_free != NULL) 2037 substream->ops->hw_free(substream); 2038 substream->ops->close(substream); 2039 substream->hw_opened = 0; 2040 } 2041 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2042 pm_qos_remove_request(&substream->latency_pm_qos_req); 2043 if (substream->pcm_release) { 2044 substream->pcm_release(substream); 2045 substream->pcm_release = NULL; 2046 } 2047 snd_pcm_detach_substream(substream); 2048 } 2049 2050 EXPORT_SYMBOL(snd_pcm_release_substream); 2051 2052 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2053 struct file *file, 2054 struct snd_pcm_substream **rsubstream) 2055 { 2056 struct snd_pcm_substream *substream; 2057 int err; 2058 2059 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2060 if (err < 0) 2061 return err; 2062 if (substream->ref_count > 1) { 2063 *rsubstream = substream; 2064 return 0; 2065 } 2066 2067 err = snd_pcm_hw_constraints_init(substream); 2068 if (err < 0) { 2069 snd_printd("snd_pcm_hw_constraints_init failed\n"); 2070 goto error; 2071 } 2072 2073 if ((err = substream->ops->open(substream)) < 0) 2074 goto error; 2075 2076 substream->hw_opened = 1; 2077 2078 err = snd_pcm_hw_constraints_complete(substream); 2079 if (err < 0) { 2080 snd_printd("snd_pcm_hw_constraints_complete failed\n"); 2081 goto error; 2082 } 2083 2084 *rsubstream = substream; 2085 return 0; 2086 2087 error: 2088 snd_pcm_release_substream(substream); 2089 return err; 2090 } 2091 2092 EXPORT_SYMBOL(snd_pcm_open_substream); 2093 2094 static int snd_pcm_open_file(struct file *file, 2095 struct snd_pcm *pcm, 2096 int stream) 2097 { 2098 struct snd_pcm_file *pcm_file; 2099 struct snd_pcm_substream *substream; 2100 int err; 2101 2102 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2103 if (err < 0) 2104 return err; 2105 2106 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2107 if (pcm_file == NULL) { 2108 snd_pcm_release_substream(substream); 2109 return -ENOMEM; 2110 } 2111 pcm_file->substream = substream; 2112 if (substream->ref_count == 1) { 2113 substream->file = pcm_file; 2114 substream->pcm_release = pcm_release_private; 2115 } 2116 file->private_data = pcm_file; 2117 2118 return 0; 2119 } 2120 2121 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2122 { 2123 struct snd_pcm *pcm; 2124 int err = nonseekable_open(inode, file); 2125 if (err < 0) 2126 return err; 2127 pcm = snd_lookup_minor_data(iminor(inode), 2128 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2129 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2130 if (pcm) 2131 snd_card_unref(pcm->card); 2132 return err; 2133 } 2134 2135 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2136 { 2137 struct snd_pcm *pcm; 2138 int err = nonseekable_open(inode, file); 2139 if (err < 0) 2140 return err; 2141 pcm = snd_lookup_minor_data(iminor(inode), 2142 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2143 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2144 if (pcm) 2145 snd_card_unref(pcm->card); 2146 return err; 2147 } 2148 2149 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2150 { 2151 int err; 2152 wait_queue_t wait; 2153 2154 if (pcm == NULL) { 2155 err = -ENODEV; 2156 goto __error1; 2157 } 2158 err = snd_card_file_add(pcm->card, file); 2159 if (err < 0) 2160 goto __error1; 2161 if (!try_module_get(pcm->card->module)) { 2162 err = -EFAULT; 2163 goto __error2; 2164 } 2165 init_waitqueue_entry(&wait, current); 2166 add_wait_queue(&pcm->open_wait, &wait); 2167 mutex_lock(&pcm->open_mutex); 2168 while (1) { 2169 err = snd_pcm_open_file(file, pcm, stream); 2170 if (err >= 0) 2171 break; 2172 if (err == -EAGAIN) { 2173 if (file->f_flags & O_NONBLOCK) { 2174 err = -EBUSY; 2175 break; 2176 } 2177 } else 2178 break; 2179 set_current_state(TASK_INTERRUPTIBLE); 2180 mutex_unlock(&pcm->open_mutex); 2181 schedule(); 2182 mutex_lock(&pcm->open_mutex); 2183 if (pcm->card->shutdown) { 2184 err = -ENODEV; 2185 break; 2186 } 2187 if (signal_pending(current)) { 2188 err = -ERESTARTSYS; 2189 break; 2190 } 2191 } 2192 remove_wait_queue(&pcm->open_wait, &wait); 2193 mutex_unlock(&pcm->open_mutex); 2194 if (err < 0) 2195 goto __error; 2196 return err; 2197 2198 __error: 2199 module_put(pcm->card->module); 2200 __error2: 2201 snd_card_file_remove(pcm->card, file); 2202 __error1: 2203 return err; 2204 } 2205 2206 static int snd_pcm_release(struct inode *inode, struct file *file) 2207 { 2208 struct snd_pcm *pcm; 2209 struct snd_pcm_substream *substream; 2210 struct snd_pcm_file *pcm_file; 2211 2212 pcm_file = file->private_data; 2213 substream = pcm_file->substream; 2214 if (snd_BUG_ON(!substream)) 2215 return -ENXIO; 2216 pcm = substream->pcm; 2217 mutex_lock(&pcm->open_mutex); 2218 snd_pcm_release_substream(substream); 2219 kfree(pcm_file); 2220 mutex_unlock(&pcm->open_mutex); 2221 wake_up(&pcm->open_wait); 2222 module_put(pcm->card->module); 2223 snd_card_file_remove(pcm->card, file); 2224 return 0; 2225 } 2226 2227 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2228 snd_pcm_uframes_t frames) 2229 { 2230 struct snd_pcm_runtime *runtime = substream->runtime; 2231 snd_pcm_sframes_t appl_ptr; 2232 snd_pcm_sframes_t ret; 2233 snd_pcm_sframes_t hw_avail; 2234 2235 if (frames == 0) 2236 return 0; 2237 2238 snd_pcm_stream_lock_irq(substream); 2239 switch (runtime->status->state) { 2240 case SNDRV_PCM_STATE_PREPARED: 2241 break; 2242 case SNDRV_PCM_STATE_DRAINING: 2243 case SNDRV_PCM_STATE_RUNNING: 2244 if (snd_pcm_update_hw_ptr(substream) >= 0) 2245 break; 2246 /* Fall through */ 2247 case SNDRV_PCM_STATE_XRUN: 2248 ret = -EPIPE; 2249 goto __end; 2250 case SNDRV_PCM_STATE_SUSPENDED: 2251 ret = -ESTRPIPE; 2252 goto __end; 2253 default: 2254 ret = -EBADFD; 2255 goto __end; 2256 } 2257 2258 hw_avail = snd_pcm_playback_hw_avail(runtime); 2259 if (hw_avail <= 0) { 2260 ret = 0; 2261 goto __end; 2262 } 2263 if (frames > (snd_pcm_uframes_t)hw_avail) 2264 frames = hw_avail; 2265 appl_ptr = runtime->control->appl_ptr - frames; 2266 if (appl_ptr < 0) 2267 appl_ptr += runtime->boundary; 2268 runtime->control->appl_ptr = appl_ptr; 2269 ret = frames; 2270 __end: 2271 snd_pcm_stream_unlock_irq(substream); 2272 return ret; 2273 } 2274 2275 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2276 snd_pcm_uframes_t frames) 2277 { 2278 struct snd_pcm_runtime *runtime = substream->runtime; 2279 snd_pcm_sframes_t appl_ptr; 2280 snd_pcm_sframes_t ret; 2281 snd_pcm_sframes_t hw_avail; 2282 2283 if (frames == 0) 2284 return 0; 2285 2286 snd_pcm_stream_lock_irq(substream); 2287 switch (runtime->status->state) { 2288 case SNDRV_PCM_STATE_PREPARED: 2289 case SNDRV_PCM_STATE_DRAINING: 2290 break; 2291 case SNDRV_PCM_STATE_RUNNING: 2292 if (snd_pcm_update_hw_ptr(substream) >= 0) 2293 break; 2294 /* Fall through */ 2295 case SNDRV_PCM_STATE_XRUN: 2296 ret = -EPIPE; 2297 goto __end; 2298 case SNDRV_PCM_STATE_SUSPENDED: 2299 ret = -ESTRPIPE; 2300 goto __end; 2301 default: 2302 ret = -EBADFD; 2303 goto __end; 2304 } 2305 2306 hw_avail = snd_pcm_capture_hw_avail(runtime); 2307 if (hw_avail <= 0) { 2308 ret = 0; 2309 goto __end; 2310 } 2311 if (frames > (snd_pcm_uframes_t)hw_avail) 2312 frames = hw_avail; 2313 appl_ptr = runtime->control->appl_ptr - frames; 2314 if (appl_ptr < 0) 2315 appl_ptr += runtime->boundary; 2316 runtime->control->appl_ptr = appl_ptr; 2317 ret = frames; 2318 __end: 2319 snd_pcm_stream_unlock_irq(substream); 2320 return ret; 2321 } 2322 2323 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2324 snd_pcm_uframes_t frames) 2325 { 2326 struct snd_pcm_runtime *runtime = substream->runtime; 2327 snd_pcm_sframes_t appl_ptr; 2328 snd_pcm_sframes_t ret; 2329 snd_pcm_sframes_t avail; 2330 2331 if (frames == 0) 2332 return 0; 2333 2334 snd_pcm_stream_lock_irq(substream); 2335 switch (runtime->status->state) { 2336 case SNDRV_PCM_STATE_PREPARED: 2337 case SNDRV_PCM_STATE_PAUSED: 2338 break; 2339 case SNDRV_PCM_STATE_DRAINING: 2340 case SNDRV_PCM_STATE_RUNNING: 2341 if (snd_pcm_update_hw_ptr(substream) >= 0) 2342 break; 2343 /* Fall through */ 2344 case SNDRV_PCM_STATE_XRUN: 2345 ret = -EPIPE; 2346 goto __end; 2347 case SNDRV_PCM_STATE_SUSPENDED: 2348 ret = -ESTRPIPE; 2349 goto __end; 2350 default: 2351 ret = -EBADFD; 2352 goto __end; 2353 } 2354 2355 avail = snd_pcm_playback_avail(runtime); 2356 if (avail <= 0) { 2357 ret = 0; 2358 goto __end; 2359 } 2360 if (frames > (snd_pcm_uframes_t)avail) 2361 frames = avail; 2362 appl_ptr = runtime->control->appl_ptr + frames; 2363 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2364 appl_ptr -= runtime->boundary; 2365 runtime->control->appl_ptr = appl_ptr; 2366 ret = frames; 2367 __end: 2368 snd_pcm_stream_unlock_irq(substream); 2369 return ret; 2370 } 2371 2372 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2373 snd_pcm_uframes_t frames) 2374 { 2375 struct snd_pcm_runtime *runtime = substream->runtime; 2376 snd_pcm_sframes_t appl_ptr; 2377 snd_pcm_sframes_t ret; 2378 snd_pcm_sframes_t avail; 2379 2380 if (frames == 0) 2381 return 0; 2382 2383 snd_pcm_stream_lock_irq(substream); 2384 switch (runtime->status->state) { 2385 case SNDRV_PCM_STATE_PREPARED: 2386 case SNDRV_PCM_STATE_DRAINING: 2387 case SNDRV_PCM_STATE_PAUSED: 2388 break; 2389 case SNDRV_PCM_STATE_RUNNING: 2390 if (snd_pcm_update_hw_ptr(substream) >= 0) 2391 break; 2392 /* Fall through */ 2393 case SNDRV_PCM_STATE_XRUN: 2394 ret = -EPIPE; 2395 goto __end; 2396 case SNDRV_PCM_STATE_SUSPENDED: 2397 ret = -ESTRPIPE; 2398 goto __end; 2399 default: 2400 ret = -EBADFD; 2401 goto __end; 2402 } 2403 2404 avail = snd_pcm_capture_avail(runtime); 2405 if (avail <= 0) { 2406 ret = 0; 2407 goto __end; 2408 } 2409 if (frames > (snd_pcm_uframes_t)avail) 2410 frames = avail; 2411 appl_ptr = runtime->control->appl_ptr + frames; 2412 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2413 appl_ptr -= runtime->boundary; 2414 runtime->control->appl_ptr = appl_ptr; 2415 ret = frames; 2416 __end: 2417 snd_pcm_stream_unlock_irq(substream); 2418 return ret; 2419 } 2420 2421 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2422 { 2423 struct snd_pcm_runtime *runtime = substream->runtime; 2424 int err; 2425 2426 snd_pcm_stream_lock_irq(substream); 2427 switch (runtime->status->state) { 2428 case SNDRV_PCM_STATE_DRAINING: 2429 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2430 goto __badfd; 2431 /* Fall through */ 2432 case SNDRV_PCM_STATE_RUNNING: 2433 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2434 break; 2435 /* Fall through */ 2436 case SNDRV_PCM_STATE_PREPARED: 2437 case SNDRV_PCM_STATE_SUSPENDED: 2438 err = 0; 2439 break; 2440 case SNDRV_PCM_STATE_XRUN: 2441 err = -EPIPE; 2442 break; 2443 default: 2444 __badfd: 2445 err = -EBADFD; 2446 break; 2447 } 2448 snd_pcm_stream_unlock_irq(substream); 2449 return err; 2450 } 2451 2452 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2453 snd_pcm_sframes_t __user *res) 2454 { 2455 struct snd_pcm_runtime *runtime = substream->runtime; 2456 int err; 2457 snd_pcm_sframes_t n = 0; 2458 2459 snd_pcm_stream_lock_irq(substream); 2460 switch (runtime->status->state) { 2461 case SNDRV_PCM_STATE_DRAINING: 2462 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2463 goto __badfd; 2464 /* Fall through */ 2465 case SNDRV_PCM_STATE_RUNNING: 2466 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2467 break; 2468 /* Fall through */ 2469 case SNDRV_PCM_STATE_PREPARED: 2470 case SNDRV_PCM_STATE_SUSPENDED: 2471 err = 0; 2472 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2473 n = snd_pcm_playback_hw_avail(runtime); 2474 else 2475 n = snd_pcm_capture_avail(runtime); 2476 n += runtime->delay; 2477 break; 2478 case SNDRV_PCM_STATE_XRUN: 2479 err = -EPIPE; 2480 break; 2481 default: 2482 __badfd: 2483 err = -EBADFD; 2484 break; 2485 } 2486 snd_pcm_stream_unlock_irq(substream); 2487 if (!err) 2488 if (put_user(n, res)) 2489 err = -EFAULT; 2490 return err; 2491 } 2492 2493 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2494 struct snd_pcm_sync_ptr __user *_sync_ptr) 2495 { 2496 struct snd_pcm_runtime *runtime = substream->runtime; 2497 struct snd_pcm_sync_ptr sync_ptr; 2498 volatile struct snd_pcm_mmap_status *status; 2499 volatile struct snd_pcm_mmap_control *control; 2500 int err; 2501 2502 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2503 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2504 return -EFAULT; 2505 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2506 return -EFAULT; 2507 status = runtime->status; 2508 control = runtime->control; 2509 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2510 err = snd_pcm_hwsync(substream); 2511 if (err < 0) 2512 return err; 2513 } 2514 snd_pcm_stream_lock_irq(substream); 2515 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2516 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2517 else 2518 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2519 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2520 control->avail_min = sync_ptr.c.control.avail_min; 2521 else 2522 sync_ptr.c.control.avail_min = control->avail_min; 2523 sync_ptr.s.status.state = status->state; 2524 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2525 sync_ptr.s.status.tstamp = status->tstamp; 2526 sync_ptr.s.status.suspended_state = status->suspended_state; 2527 snd_pcm_stream_unlock_irq(substream); 2528 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2529 return -EFAULT; 2530 return 0; 2531 } 2532 2533 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2534 { 2535 struct snd_pcm_runtime *runtime = substream->runtime; 2536 int arg; 2537 2538 if (get_user(arg, _arg)) 2539 return -EFAULT; 2540 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2541 return -EINVAL; 2542 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY; 2543 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 2544 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC; 2545 return 0; 2546 } 2547 2548 static int snd_pcm_common_ioctl1(struct file *file, 2549 struct snd_pcm_substream *substream, 2550 unsigned int cmd, void __user *arg) 2551 { 2552 switch (cmd) { 2553 case SNDRV_PCM_IOCTL_PVERSION: 2554 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2555 case SNDRV_PCM_IOCTL_INFO: 2556 return snd_pcm_info_user(substream, arg); 2557 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2558 return 0; 2559 case SNDRV_PCM_IOCTL_TTSTAMP: 2560 return snd_pcm_tstamp(substream, arg); 2561 case SNDRV_PCM_IOCTL_HW_REFINE: 2562 return snd_pcm_hw_refine_user(substream, arg); 2563 case SNDRV_PCM_IOCTL_HW_PARAMS: 2564 return snd_pcm_hw_params_user(substream, arg); 2565 case SNDRV_PCM_IOCTL_HW_FREE: 2566 return snd_pcm_hw_free(substream); 2567 case SNDRV_PCM_IOCTL_SW_PARAMS: 2568 return snd_pcm_sw_params_user(substream, arg); 2569 case SNDRV_PCM_IOCTL_STATUS: 2570 return snd_pcm_status_user(substream, arg); 2571 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2572 return snd_pcm_channel_info_user(substream, arg); 2573 case SNDRV_PCM_IOCTL_PREPARE: 2574 return snd_pcm_prepare(substream, file); 2575 case SNDRV_PCM_IOCTL_RESET: 2576 return snd_pcm_reset(substream); 2577 case SNDRV_PCM_IOCTL_START: 2578 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2579 case SNDRV_PCM_IOCTL_LINK: 2580 return snd_pcm_link(substream, (int)(unsigned long) arg); 2581 case SNDRV_PCM_IOCTL_UNLINK: 2582 return snd_pcm_unlink(substream); 2583 case SNDRV_PCM_IOCTL_RESUME: 2584 return snd_pcm_resume(substream); 2585 case SNDRV_PCM_IOCTL_XRUN: 2586 return snd_pcm_xrun(substream); 2587 case SNDRV_PCM_IOCTL_HWSYNC: 2588 return snd_pcm_hwsync(substream); 2589 case SNDRV_PCM_IOCTL_DELAY: 2590 return snd_pcm_delay(substream, arg); 2591 case SNDRV_PCM_IOCTL_SYNC_PTR: 2592 return snd_pcm_sync_ptr(substream, arg); 2593 #ifdef CONFIG_SND_SUPPORT_OLD_API 2594 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2595 return snd_pcm_hw_refine_old_user(substream, arg); 2596 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2597 return snd_pcm_hw_params_old_user(substream, arg); 2598 #endif 2599 case SNDRV_PCM_IOCTL_DRAIN: 2600 return snd_pcm_drain(substream, file); 2601 case SNDRV_PCM_IOCTL_DROP: 2602 return snd_pcm_drop(substream); 2603 case SNDRV_PCM_IOCTL_PAUSE: 2604 { 2605 int res; 2606 snd_pcm_stream_lock_irq(substream); 2607 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2608 snd_pcm_stream_unlock_irq(substream); 2609 return res; 2610 } 2611 } 2612 snd_printd("unknown ioctl = 0x%x\n", cmd); 2613 return -ENOTTY; 2614 } 2615 2616 static int snd_pcm_playback_ioctl1(struct file *file, 2617 struct snd_pcm_substream *substream, 2618 unsigned int cmd, void __user *arg) 2619 { 2620 if (snd_BUG_ON(!substream)) 2621 return -ENXIO; 2622 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2623 return -EINVAL; 2624 switch (cmd) { 2625 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2626 { 2627 struct snd_xferi xferi; 2628 struct snd_xferi __user *_xferi = arg; 2629 struct snd_pcm_runtime *runtime = substream->runtime; 2630 snd_pcm_sframes_t result; 2631 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2632 return -EBADFD; 2633 if (put_user(0, &_xferi->result)) 2634 return -EFAULT; 2635 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2636 return -EFAULT; 2637 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2638 __put_user(result, &_xferi->result); 2639 return result < 0 ? result : 0; 2640 } 2641 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2642 { 2643 struct snd_xfern xfern; 2644 struct snd_xfern __user *_xfern = arg; 2645 struct snd_pcm_runtime *runtime = substream->runtime; 2646 void __user **bufs; 2647 snd_pcm_sframes_t result; 2648 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2649 return -EBADFD; 2650 if (runtime->channels > 128) 2651 return -EINVAL; 2652 if (put_user(0, &_xfern->result)) 2653 return -EFAULT; 2654 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2655 return -EFAULT; 2656 2657 bufs = memdup_user(xfern.bufs, 2658 sizeof(void *) * runtime->channels); 2659 if (IS_ERR(bufs)) 2660 return PTR_ERR(bufs); 2661 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2662 kfree(bufs); 2663 __put_user(result, &_xfern->result); 2664 return result < 0 ? result : 0; 2665 } 2666 case SNDRV_PCM_IOCTL_REWIND: 2667 { 2668 snd_pcm_uframes_t frames; 2669 snd_pcm_uframes_t __user *_frames = arg; 2670 snd_pcm_sframes_t result; 2671 if (get_user(frames, _frames)) 2672 return -EFAULT; 2673 if (put_user(0, _frames)) 2674 return -EFAULT; 2675 result = snd_pcm_playback_rewind(substream, frames); 2676 __put_user(result, _frames); 2677 return result < 0 ? result : 0; 2678 } 2679 case SNDRV_PCM_IOCTL_FORWARD: 2680 { 2681 snd_pcm_uframes_t frames; 2682 snd_pcm_uframes_t __user *_frames = arg; 2683 snd_pcm_sframes_t result; 2684 if (get_user(frames, _frames)) 2685 return -EFAULT; 2686 if (put_user(0, _frames)) 2687 return -EFAULT; 2688 result = snd_pcm_playback_forward(substream, frames); 2689 __put_user(result, _frames); 2690 return result < 0 ? result : 0; 2691 } 2692 } 2693 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2694 } 2695 2696 static int snd_pcm_capture_ioctl1(struct file *file, 2697 struct snd_pcm_substream *substream, 2698 unsigned int cmd, void __user *arg) 2699 { 2700 if (snd_BUG_ON(!substream)) 2701 return -ENXIO; 2702 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2703 return -EINVAL; 2704 switch (cmd) { 2705 case SNDRV_PCM_IOCTL_READI_FRAMES: 2706 { 2707 struct snd_xferi xferi; 2708 struct snd_xferi __user *_xferi = arg; 2709 struct snd_pcm_runtime *runtime = substream->runtime; 2710 snd_pcm_sframes_t result; 2711 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2712 return -EBADFD; 2713 if (put_user(0, &_xferi->result)) 2714 return -EFAULT; 2715 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2716 return -EFAULT; 2717 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2718 __put_user(result, &_xferi->result); 2719 return result < 0 ? result : 0; 2720 } 2721 case SNDRV_PCM_IOCTL_READN_FRAMES: 2722 { 2723 struct snd_xfern xfern; 2724 struct snd_xfern __user *_xfern = arg; 2725 struct snd_pcm_runtime *runtime = substream->runtime; 2726 void *bufs; 2727 snd_pcm_sframes_t result; 2728 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2729 return -EBADFD; 2730 if (runtime->channels > 128) 2731 return -EINVAL; 2732 if (put_user(0, &_xfern->result)) 2733 return -EFAULT; 2734 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2735 return -EFAULT; 2736 2737 bufs = memdup_user(xfern.bufs, 2738 sizeof(void *) * runtime->channels); 2739 if (IS_ERR(bufs)) 2740 return PTR_ERR(bufs); 2741 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2742 kfree(bufs); 2743 __put_user(result, &_xfern->result); 2744 return result < 0 ? result : 0; 2745 } 2746 case SNDRV_PCM_IOCTL_REWIND: 2747 { 2748 snd_pcm_uframes_t frames; 2749 snd_pcm_uframes_t __user *_frames = arg; 2750 snd_pcm_sframes_t result; 2751 if (get_user(frames, _frames)) 2752 return -EFAULT; 2753 if (put_user(0, _frames)) 2754 return -EFAULT; 2755 result = snd_pcm_capture_rewind(substream, frames); 2756 __put_user(result, _frames); 2757 return result < 0 ? result : 0; 2758 } 2759 case SNDRV_PCM_IOCTL_FORWARD: 2760 { 2761 snd_pcm_uframes_t frames; 2762 snd_pcm_uframes_t __user *_frames = arg; 2763 snd_pcm_sframes_t result; 2764 if (get_user(frames, _frames)) 2765 return -EFAULT; 2766 if (put_user(0, _frames)) 2767 return -EFAULT; 2768 result = snd_pcm_capture_forward(substream, frames); 2769 __put_user(result, _frames); 2770 return result < 0 ? result : 0; 2771 } 2772 } 2773 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2774 } 2775 2776 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2777 unsigned long arg) 2778 { 2779 struct snd_pcm_file *pcm_file; 2780 2781 pcm_file = file->private_data; 2782 2783 if (((cmd >> 8) & 0xff) != 'A') 2784 return -ENOTTY; 2785 2786 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2787 (void __user *)arg); 2788 } 2789 2790 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2791 unsigned long arg) 2792 { 2793 struct snd_pcm_file *pcm_file; 2794 2795 pcm_file = file->private_data; 2796 2797 if (((cmd >> 8) & 0xff) != 'A') 2798 return -ENOTTY; 2799 2800 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2801 (void __user *)arg); 2802 } 2803 2804 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2805 unsigned int cmd, void *arg) 2806 { 2807 mm_segment_t fs; 2808 int result; 2809 2810 fs = snd_enter_user(); 2811 switch (substream->stream) { 2812 case SNDRV_PCM_STREAM_PLAYBACK: 2813 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2814 (void __user *)arg); 2815 break; 2816 case SNDRV_PCM_STREAM_CAPTURE: 2817 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2818 (void __user *)arg); 2819 break; 2820 default: 2821 result = -EINVAL; 2822 break; 2823 } 2824 snd_leave_user(fs); 2825 return result; 2826 } 2827 2828 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2829 2830 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2831 loff_t * offset) 2832 { 2833 struct snd_pcm_file *pcm_file; 2834 struct snd_pcm_substream *substream; 2835 struct snd_pcm_runtime *runtime; 2836 snd_pcm_sframes_t result; 2837 2838 pcm_file = file->private_data; 2839 substream = pcm_file->substream; 2840 if (PCM_RUNTIME_CHECK(substream)) 2841 return -ENXIO; 2842 runtime = substream->runtime; 2843 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2844 return -EBADFD; 2845 if (!frame_aligned(runtime, count)) 2846 return -EINVAL; 2847 count = bytes_to_frames(runtime, count); 2848 result = snd_pcm_lib_read(substream, buf, count); 2849 if (result > 0) 2850 result = frames_to_bytes(runtime, result); 2851 return result; 2852 } 2853 2854 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2855 size_t count, loff_t * offset) 2856 { 2857 struct snd_pcm_file *pcm_file; 2858 struct snd_pcm_substream *substream; 2859 struct snd_pcm_runtime *runtime; 2860 snd_pcm_sframes_t result; 2861 2862 pcm_file = file->private_data; 2863 substream = pcm_file->substream; 2864 if (PCM_RUNTIME_CHECK(substream)) 2865 return -ENXIO; 2866 runtime = substream->runtime; 2867 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2868 return -EBADFD; 2869 if (!frame_aligned(runtime, count)) 2870 return -EINVAL; 2871 count = bytes_to_frames(runtime, count); 2872 result = snd_pcm_lib_write(substream, buf, count); 2873 if (result > 0) 2874 result = frames_to_bytes(runtime, result); 2875 return result; 2876 } 2877 2878 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 2879 unsigned long nr_segs, loff_t pos) 2880 2881 { 2882 struct snd_pcm_file *pcm_file; 2883 struct snd_pcm_substream *substream; 2884 struct snd_pcm_runtime *runtime; 2885 snd_pcm_sframes_t result; 2886 unsigned long i; 2887 void __user **bufs; 2888 snd_pcm_uframes_t frames; 2889 2890 pcm_file = iocb->ki_filp->private_data; 2891 substream = pcm_file->substream; 2892 if (PCM_RUNTIME_CHECK(substream)) 2893 return -ENXIO; 2894 runtime = substream->runtime; 2895 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2896 return -EBADFD; 2897 if (nr_segs > 1024 || nr_segs != runtime->channels) 2898 return -EINVAL; 2899 if (!frame_aligned(runtime, iov->iov_len)) 2900 return -EINVAL; 2901 frames = bytes_to_samples(runtime, iov->iov_len); 2902 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2903 if (bufs == NULL) 2904 return -ENOMEM; 2905 for (i = 0; i < nr_segs; ++i) 2906 bufs[i] = iov[i].iov_base; 2907 result = snd_pcm_lib_readv(substream, bufs, frames); 2908 if (result > 0) 2909 result = frames_to_bytes(runtime, result); 2910 kfree(bufs); 2911 return result; 2912 } 2913 2914 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 2915 unsigned long nr_segs, loff_t pos) 2916 { 2917 struct snd_pcm_file *pcm_file; 2918 struct snd_pcm_substream *substream; 2919 struct snd_pcm_runtime *runtime; 2920 snd_pcm_sframes_t result; 2921 unsigned long i; 2922 void __user **bufs; 2923 snd_pcm_uframes_t frames; 2924 2925 pcm_file = iocb->ki_filp->private_data; 2926 substream = pcm_file->substream; 2927 if (PCM_RUNTIME_CHECK(substream)) 2928 return -ENXIO; 2929 runtime = substream->runtime; 2930 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2931 return -EBADFD; 2932 if (nr_segs > 128 || nr_segs != runtime->channels || 2933 !frame_aligned(runtime, iov->iov_len)) 2934 return -EINVAL; 2935 frames = bytes_to_samples(runtime, iov->iov_len); 2936 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2937 if (bufs == NULL) 2938 return -ENOMEM; 2939 for (i = 0; i < nr_segs; ++i) 2940 bufs[i] = iov[i].iov_base; 2941 result = snd_pcm_lib_writev(substream, bufs, frames); 2942 if (result > 0) 2943 result = frames_to_bytes(runtime, result); 2944 kfree(bufs); 2945 return result; 2946 } 2947 2948 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 2949 { 2950 struct snd_pcm_file *pcm_file; 2951 struct snd_pcm_substream *substream; 2952 struct snd_pcm_runtime *runtime; 2953 unsigned int mask; 2954 snd_pcm_uframes_t avail; 2955 2956 pcm_file = file->private_data; 2957 2958 substream = pcm_file->substream; 2959 if (PCM_RUNTIME_CHECK(substream)) 2960 return -ENXIO; 2961 runtime = substream->runtime; 2962 2963 poll_wait(file, &runtime->sleep, wait); 2964 2965 snd_pcm_stream_lock_irq(substream); 2966 avail = snd_pcm_playback_avail(runtime); 2967 switch (runtime->status->state) { 2968 case SNDRV_PCM_STATE_RUNNING: 2969 case SNDRV_PCM_STATE_PREPARED: 2970 case SNDRV_PCM_STATE_PAUSED: 2971 if (avail >= runtime->control->avail_min) { 2972 mask = POLLOUT | POLLWRNORM; 2973 break; 2974 } 2975 /* Fall through */ 2976 case SNDRV_PCM_STATE_DRAINING: 2977 mask = 0; 2978 break; 2979 default: 2980 mask = POLLOUT | POLLWRNORM | POLLERR; 2981 break; 2982 } 2983 snd_pcm_stream_unlock_irq(substream); 2984 return mask; 2985 } 2986 2987 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 2988 { 2989 struct snd_pcm_file *pcm_file; 2990 struct snd_pcm_substream *substream; 2991 struct snd_pcm_runtime *runtime; 2992 unsigned int mask; 2993 snd_pcm_uframes_t avail; 2994 2995 pcm_file = file->private_data; 2996 2997 substream = pcm_file->substream; 2998 if (PCM_RUNTIME_CHECK(substream)) 2999 return -ENXIO; 3000 runtime = substream->runtime; 3001 3002 poll_wait(file, &runtime->sleep, wait); 3003 3004 snd_pcm_stream_lock_irq(substream); 3005 avail = snd_pcm_capture_avail(runtime); 3006 switch (runtime->status->state) { 3007 case SNDRV_PCM_STATE_RUNNING: 3008 case SNDRV_PCM_STATE_PREPARED: 3009 case SNDRV_PCM_STATE_PAUSED: 3010 if (avail >= runtime->control->avail_min) { 3011 mask = POLLIN | POLLRDNORM; 3012 break; 3013 } 3014 mask = 0; 3015 break; 3016 case SNDRV_PCM_STATE_DRAINING: 3017 if (avail > 0) { 3018 mask = POLLIN | POLLRDNORM; 3019 break; 3020 } 3021 /* Fall through */ 3022 default: 3023 mask = POLLIN | POLLRDNORM | POLLERR; 3024 break; 3025 } 3026 snd_pcm_stream_unlock_irq(substream); 3027 return mask; 3028 } 3029 3030 /* 3031 * mmap support 3032 */ 3033 3034 /* 3035 * Only on coherent architectures, we can mmap the status and the control records 3036 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3037 */ 3038 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3039 /* 3040 * mmap status record 3041 */ 3042 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 3043 struct vm_fault *vmf) 3044 { 3045 struct snd_pcm_substream *substream = area->vm_private_data; 3046 struct snd_pcm_runtime *runtime; 3047 3048 if (substream == NULL) 3049 return VM_FAULT_SIGBUS; 3050 runtime = substream->runtime; 3051 vmf->page = virt_to_page(runtime->status); 3052 get_page(vmf->page); 3053 return 0; 3054 } 3055 3056 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3057 { 3058 .fault = snd_pcm_mmap_status_fault, 3059 }; 3060 3061 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3062 struct vm_area_struct *area) 3063 { 3064 long size; 3065 if (!(area->vm_flags & VM_READ)) 3066 return -EINVAL; 3067 size = area->vm_end - area->vm_start; 3068 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3069 return -EINVAL; 3070 area->vm_ops = &snd_pcm_vm_ops_status; 3071 area->vm_private_data = substream; 3072 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3073 return 0; 3074 } 3075 3076 /* 3077 * mmap control record 3078 */ 3079 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3080 struct vm_fault *vmf) 3081 { 3082 struct snd_pcm_substream *substream = area->vm_private_data; 3083 struct snd_pcm_runtime *runtime; 3084 3085 if (substream == NULL) 3086 return VM_FAULT_SIGBUS; 3087 runtime = substream->runtime; 3088 vmf->page = virt_to_page(runtime->control); 3089 get_page(vmf->page); 3090 return 0; 3091 } 3092 3093 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3094 { 3095 .fault = snd_pcm_mmap_control_fault, 3096 }; 3097 3098 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3099 struct vm_area_struct *area) 3100 { 3101 long size; 3102 if (!(area->vm_flags & VM_READ)) 3103 return -EINVAL; 3104 size = area->vm_end - area->vm_start; 3105 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3106 return -EINVAL; 3107 area->vm_ops = &snd_pcm_vm_ops_control; 3108 area->vm_private_data = substream; 3109 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3110 return 0; 3111 } 3112 #else /* ! coherent mmap */ 3113 /* 3114 * don't support mmap for status and control records. 3115 */ 3116 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3117 struct vm_area_struct *area) 3118 { 3119 return -ENXIO; 3120 } 3121 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3122 struct vm_area_struct *area) 3123 { 3124 return -ENXIO; 3125 } 3126 #endif /* coherent mmap */ 3127 3128 static inline struct page * 3129 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3130 { 3131 void *vaddr = substream->runtime->dma_area + ofs; 3132 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3133 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3134 return virt_to_page(CAC_ADDR(vaddr)); 3135 #endif 3136 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE) 3137 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) { 3138 dma_addr_t addr = substream->runtime->dma_addr + ofs; 3139 addr -= get_dma_offset(substream->dma_buffer.dev.dev); 3140 /* assume dma_handle set via pfn_to_phys() in 3141 * mm/dma-noncoherent.c 3142 */ 3143 return pfn_to_page(addr >> PAGE_SHIFT); 3144 } 3145 #endif 3146 return virt_to_page(vaddr); 3147 } 3148 3149 /* 3150 * fault callback for mmapping a RAM page 3151 */ 3152 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3153 struct vm_fault *vmf) 3154 { 3155 struct snd_pcm_substream *substream = area->vm_private_data; 3156 struct snd_pcm_runtime *runtime; 3157 unsigned long offset; 3158 struct page * page; 3159 size_t dma_bytes; 3160 3161 if (substream == NULL) 3162 return VM_FAULT_SIGBUS; 3163 runtime = substream->runtime; 3164 offset = vmf->pgoff << PAGE_SHIFT; 3165 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3166 if (offset > dma_bytes - PAGE_SIZE) 3167 return VM_FAULT_SIGBUS; 3168 if (substream->ops->page) 3169 page = substream->ops->page(substream, offset); 3170 else 3171 page = snd_pcm_default_page_ops(substream, offset); 3172 if (!page) 3173 return VM_FAULT_SIGBUS; 3174 get_page(page); 3175 vmf->page = page; 3176 return 0; 3177 } 3178 3179 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3180 .open = snd_pcm_mmap_data_open, 3181 .close = snd_pcm_mmap_data_close, 3182 }; 3183 3184 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3185 .open = snd_pcm_mmap_data_open, 3186 .close = snd_pcm_mmap_data_close, 3187 .fault = snd_pcm_mmap_data_fault, 3188 }; 3189 3190 #ifndef ARCH_HAS_DMA_MMAP_COHERENT 3191 /* This should be defined / handled globally! */ 3192 #ifdef CONFIG_ARM 3193 #define ARCH_HAS_DMA_MMAP_COHERENT 3194 #endif 3195 #endif 3196 3197 /* 3198 * mmap the DMA buffer on RAM 3199 */ 3200 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3201 struct vm_area_struct *area) 3202 { 3203 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3204 #ifdef CONFIG_GENERIC_ALLOCATOR 3205 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3206 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3207 return remap_pfn_range(area, area->vm_start, 3208 substream->dma_buffer.addr >> PAGE_SHIFT, 3209 area->vm_end - area->vm_start, area->vm_page_prot); 3210 } 3211 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3212 #ifdef ARCH_HAS_DMA_MMAP_COHERENT 3213 if (!substream->ops->page && 3214 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3215 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3216 area, 3217 substream->runtime->dma_area, 3218 substream->runtime->dma_addr, 3219 area->vm_end - area->vm_start); 3220 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3221 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV && 3222 !plat_device_is_coherent(substream->dma_buffer.dev.dev)) 3223 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3224 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */ 3225 /* mmap with fault handler */ 3226 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3227 return 0; 3228 } 3229 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3230 3231 /* 3232 * mmap the DMA buffer on I/O memory area 3233 */ 3234 #if SNDRV_PCM_INFO_MMAP_IOMEM 3235 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3236 struct vm_area_struct *area) 3237 { 3238 struct snd_pcm_runtime *runtime = substream->runtime;; 3239 3240 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3241 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3242 } 3243 3244 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3245 #endif /* SNDRV_PCM_INFO_MMAP */ 3246 3247 /* 3248 * mmap DMA buffer 3249 */ 3250 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3251 struct vm_area_struct *area) 3252 { 3253 struct snd_pcm_runtime *runtime; 3254 long size; 3255 unsigned long offset; 3256 size_t dma_bytes; 3257 int err; 3258 3259 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3260 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3261 return -EINVAL; 3262 } else { 3263 if (!(area->vm_flags & VM_READ)) 3264 return -EINVAL; 3265 } 3266 runtime = substream->runtime; 3267 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3268 return -EBADFD; 3269 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3270 return -ENXIO; 3271 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3272 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3273 return -EINVAL; 3274 size = area->vm_end - area->vm_start; 3275 offset = area->vm_pgoff << PAGE_SHIFT; 3276 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3277 if ((size_t)size > dma_bytes) 3278 return -EINVAL; 3279 if (offset > dma_bytes - size) 3280 return -EINVAL; 3281 3282 area->vm_ops = &snd_pcm_vm_ops_data; 3283 area->vm_private_data = substream; 3284 if (substream->ops->mmap) 3285 err = substream->ops->mmap(substream, area); 3286 else 3287 err = snd_pcm_lib_default_mmap(substream, area); 3288 if (!err) 3289 atomic_inc(&substream->mmap_count); 3290 return err; 3291 } 3292 3293 EXPORT_SYMBOL(snd_pcm_mmap_data); 3294 3295 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3296 { 3297 struct snd_pcm_file * pcm_file; 3298 struct snd_pcm_substream *substream; 3299 unsigned long offset; 3300 3301 pcm_file = file->private_data; 3302 substream = pcm_file->substream; 3303 if (PCM_RUNTIME_CHECK(substream)) 3304 return -ENXIO; 3305 3306 offset = area->vm_pgoff << PAGE_SHIFT; 3307 switch (offset) { 3308 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3309 if (pcm_file->no_compat_mmap) 3310 return -ENXIO; 3311 return snd_pcm_mmap_status(substream, file, area); 3312 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3313 if (pcm_file->no_compat_mmap) 3314 return -ENXIO; 3315 return snd_pcm_mmap_control(substream, file, area); 3316 default: 3317 return snd_pcm_mmap_data(substream, file, area); 3318 } 3319 return 0; 3320 } 3321 3322 static int snd_pcm_fasync(int fd, struct file * file, int on) 3323 { 3324 struct snd_pcm_file * pcm_file; 3325 struct snd_pcm_substream *substream; 3326 struct snd_pcm_runtime *runtime; 3327 3328 pcm_file = file->private_data; 3329 substream = pcm_file->substream; 3330 if (PCM_RUNTIME_CHECK(substream)) 3331 return -ENXIO; 3332 runtime = substream->runtime; 3333 return fasync_helper(fd, file, on, &runtime->fasync); 3334 } 3335 3336 /* 3337 * ioctl32 compat 3338 */ 3339 #ifdef CONFIG_COMPAT 3340 #include "pcm_compat.c" 3341 #else 3342 #define snd_pcm_ioctl_compat NULL 3343 #endif 3344 3345 /* 3346 * To be removed helpers to keep binary compatibility 3347 */ 3348 3349 #ifdef CONFIG_SND_SUPPORT_OLD_API 3350 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3351 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3352 3353 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3354 struct snd_pcm_hw_params_old *oparams) 3355 { 3356 unsigned int i; 3357 3358 memset(params, 0, sizeof(*params)); 3359 params->flags = oparams->flags; 3360 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3361 params->masks[i].bits[0] = oparams->masks[i]; 3362 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3363 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3364 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3365 params->info = oparams->info; 3366 params->msbits = oparams->msbits; 3367 params->rate_num = oparams->rate_num; 3368 params->rate_den = oparams->rate_den; 3369 params->fifo_size = oparams->fifo_size; 3370 } 3371 3372 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3373 struct snd_pcm_hw_params *params) 3374 { 3375 unsigned int i; 3376 3377 memset(oparams, 0, sizeof(*oparams)); 3378 oparams->flags = params->flags; 3379 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3380 oparams->masks[i] = params->masks[i].bits[0]; 3381 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3382 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3383 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3384 oparams->info = params->info; 3385 oparams->msbits = params->msbits; 3386 oparams->rate_num = params->rate_num; 3387 oparams->rate_den = params->rate_den; 3388 oparams->fifo_size = params->fifo_size; 3389 } 3390 3391 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3392 struct snd_pcm_hw_params_old __user * _oparams) 3393 { 3394 struct snd_pcm_hw_params *params; 3395 struct snd_pcm_hw_params_old *oparams = NULL; 3396 int err; 3397 3398 params = kmalloc(sizeof(*params), GFP_KERNEL); 3399 if (!params) 3400 return -ENOMEM; 3401 3402 oparams = memdup_user(_oparams, sizeof(*oparams)); 3403 if (IS_ERR(oparams)) { 3404 err = PTR_ERR(oparams); 3405 goto out; 3406 } 3407 snd_pcm_hw_convert_from_old_params(params, oparams); 3408 err = snd_pcm_hw_refine(substream, params); 3409 snd_pcm_hw_convert_to_old_params(oparams, params); 3410 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3411 if (!err) 3412 err = -EFAULT; 3413 } 3414 3415 kfree(oparams); 3416 out: 3417 kfree(params); 3418 return err; 3419 } 3420 3421 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3422 struct snd_pcm_hw_params_old __user * _oparams) 3423 { 3424 struct snd_pcm_hw_params *params; 3425 struct snd_pcm_hw_params_old *oparams = NULL; 3426 int err; 3427 3428 params = kmalloc(sizeof(*params), GFP_KERNEL); 3429 if (!params) 3430 return -ENOMEM; 3431 3432 oparams = memdup_user(_oparams, sizeof(*oparams)); 3433 if (IS_ERR(oparams)) { 3434 err = PTR_ERR(oparams); 3435 goto out; 3436 } 3437 snd_pcm_hw_convert_from_old_params(params, oparams); 3438 err = snd_pcm_hw_params(substream, params); 3439 snd_pcm_hw_convert_to_old_params(oparams, params); 3440 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3441 if (!err) 3442 err = -EFAULT; 3443 } 3444 3445 kfree(oparams); 3446 out: 3447 kfree(params); 3448 return err; 3449 } 3450 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3451 3452 #ifndef CONFIG_MMU 3453 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3454 unsigned long addr, 3455 unsigned long len, 3456 unsigned long pgoff, 3457 unsigned long flags) 3458 { 3459 struct snd_pcm_file *pcm_file = file->private_data; 3460 struct snd_pcm_substream *substream = pcm_file->substream; 3461 struct snd_pcm_runtime *runtime = substream->runtime; 3462 unsigned long offset = pgoff << PAGE_SHIFT; 3463 3464 switch (offset) { 3465 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3466 return (unsigned long)runtime->status; 3467 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3468 return (unsigned long)runtime->control; 3469 default: 3470 return (unsigned long)runtime->dma_area + offset; 3471 } 3472 } 3473 #else 3474 # define snd_pcm_get_unmapped_area NULL 3475 #endif 3476 3477 /* 3478 * Register section 3479 */ 3480 3481 const struct file_operations snd_pcm_f_ops[2] = { 3482 { 3483 .owner = THIS_MODULE, 3484 .write = snd_pcm_write, 3485 .aio_write = snd_pcm_aio_write, 3486 .open = snd_pcm_playback_open, 3487 .release = snd_pcm_release, 3488 .llseek = no_llseek, 3489 .poll = snd_pcm_playback_poll, 3490 .unlocked_ioctl = snd_pcm_playback_ioctl, 3491 .compat_ioctl = snd_pcm_ioctl_compat, 3492 .mmap = snd_pcm_mmap, 3493 .fasync = snd_pcm_fasync, 3494 .get_unmapped_area = snd_pcm_get_unmapped_area, 3495 }, 3496 { 3497 .owner = THIS_MODULE, 3498 .read = snd_pcm_read, 3499 .aio_read = snd_pcm_aio_read, 3500 .open = snd_pcm_capture_open, 3501 .release = snd_pcm_release, 3502 .llseek = no_llseek, 3503 .poll = snd_pcm_capture_poll, 3504 .unlocked_ioctl = snd_pcm_capture_ioctl, 3505 .compat_ioctl = snd_pcm_ioctl_compat, 3506 .mmap = snd_pcm_mmap, 3507 .fasync = snd_pcm_fasync, 3508 .get_unmapped_area = snd_pcm_get_unmapped_area, 3509 } 3510 }; 3511