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 pr_debug("%s = ", snd_pcm_hw_param_names[k]); 194 pr_cont("%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 pr_cont("%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 pr_debug("%s = ", snd_pcm_hw_param_names[k]); 214 if (i->empty) 215 pr_cont("empty"); 216 else 217 pr_cont("%c%u %u%c", 218 i->openmin ? '(' : '[', i->min, 219 i->max, i->openmax ? ')' : ']'); 220 pr_cont(" -> "); 221 #endif 222 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 223 #ifdef RULES_DEBUG 224 if (i->empty) 225 pr_cont("empty\n"); 226 else 227 pr_cont("%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 pr_debug("Rule %d [%p]: ", k, r->func); 259 if (r->var >= 0) { 260 pr_cont("%s = ", snd_pcm_hw_param_names[r->var]); 261 if (hw_is_mask(r->var)) { 262 m = hw_param_mask(params, r->var); 263 pr_cont("%x", *m->bits); 264 } else { 265 i = hw_param_interval(params, r->var); 266 if (i->empty) 267 pr_cont("empty"); 268 else 269 pr_cont("%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 pr_cont(" -> "); 279 if (hw_is_mask(r->var)) 280 pr_cont("%x", *m->bits); 281 else { 282 if (i->empty) 283 pr_cont("empty"); 284 else 285 pr_cont("%c%u %u%c", 286 i->openmin ? '(' : '[', i->min, 287 i->max, i->openmax ? ')' : ']'); 288 } 289 } 290 pr_cont("\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 IS_ENABLED(CONFIG_SND_PCM_OSS) 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->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12) && 547 params->tstamp_type > SNDRV_PCM_TSTAMP_TYPE_LAST) 548 return -EINVAL; 549 if (params->avail_min == 0) 550 return -EINVAL; 551 if (params->silence_size >= runtime->boundary) { 552 if (params->silence_threshold != 0) 553 return -EINVAL; 554 } else { 555 if (params->silence_size > params->silence_threshold) 556 return -EINVAL; 557 if (params->silence_threshold > runtime->buffer_size) 558 return -EINVAL; 559 } 560 err = 0; 561 snd_pcm_stream_lock_irq(substream); 562 runtime->tstamp_mode = params->tstamp_mode; 563 if (params->proto >= SNDRV_PROTOCOL_VERSION(2, 0, 12)) 564 runtime->tstamp_type = params->tstamp_type; 565 runtime->period_step = params->period_step; 566 runtime->control->avail_min = params->avail_min; 567 runtime->start_threshold = params->start_threshold; 568 runtime->stop_threshold = params->stop_threshold; 569 runtime->silence_threshold = params->silence_threshold; 570 runtime->silence_size = params->silence_size; 571 params->boundary = runtime->boundary; 572 if (snd_pcm_running(substream)) { 573 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 574 runtime->silence_size > 0) 575 snd_pcm_playback_silence(substream, ULONG_MAX); 576 err = snd_pcm_update_state(substream, runtime); 577 } 578 snd_pcm_stream_unlock_irq(substream); 579 return err; 580 } 581 582 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 583 struct snd_pcm_sw_params __user * _params) 584 { 585 struct snd_pcm_sw_params params; 586 int err; 587 if (copy_from_user(¶ms, _params, sizeof(params))) 588 return -EFAULT; 589 err = snd_pcm_sw_params(substream, ¶ms); 590 if (copy_to_user(_params, ¶ms, sizeof(params))) 591 return -EFAULT; 592 return err; 593 } 594 595 int snd_pcm_status(struct snd_pcm_substream *substream, 596 struct snd_pcm_status *status) 597 { 598 struct snd_pcm_runtime *runtime = substream->runtime; 599 600 snd_pcm_stream_lock_irq(substream); 601 status->state = runtime->status->state; 602 status->suspended_state = runtime->status->suspended_state; 603 if (status->state == SNDRV_PCM_STATE_OPEN) 604 goto _end; 605 status->trigger_tstamp = runtime->trigger_tstamp; 606 if (snd_pcm_running(substream)) { 607 snd_pcm_update_hw_ptr(substream); 608 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 609 status->tstamp = runtime->status->tstamp; 610 status->audio_tstamp = 611 runtime->status->audio_tstamp; 612 goto _tstamp_end; 613 } 614 } 615 snd_pcm_gettime(runtime, &status->tstamp); 616 _tstamp_end: 617 status->appl_ptr = runtime->control->appl_ptr; 618 status->hw_ptr = runtime->status->hw_ptr; 619 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 620 status->avail = snd_pcm_playback_avail(runtime); 621 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 622 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 623 status->delay = runtime->buffer_size - status->avail; 624 status->delay += runtime->delay; 625 } else 626 status->delay = 0; 627 } else { 628 status->avail = snd_pcm_capture_avail(runtime); 629 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 630 status->delay = status->avail + runtime->delay; 631 else 632 status->delay = 0; 633 } 634 status->avail_max = runtime->avail_max; 635 status->overrange = runtime->overrange; 636 runtime->avail_max = 0; 637 runtime->overrange = 0; 638 _end: 639 snd_pcm_stream_unlock_irq(substream); 640 return 0; 641 } 642 643 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 644 struct snd_pcm_status __user * _status) 645 { 646 struct snd_pcm_status status; 647 int res; 648 649 memset(&status, 0, sizeof(status)); 650 res = snd_pcm_status(substream, &status); 651 if (res < 0) 652 return res; 653 if (copy_to_user(_status, &status, sizeof(status))) 654 return -EFAULT; 655 return 0; 656 } 657 658 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 659 struct snd_pcm_channel_info * info) 660 { 661 struct snd_pcm_runtime *runtime; 662 unsigned int channel; 663 664 channel = info->channel; 665 runtime = substream->runtime; 666 snd_pcm_stream_lock_irq(substream); 667 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 668 snd_pcm_stream_unlock_irq(substream); 669 return -EBADFD; 670 } 671 snd_pcm_stream_unlock_irq(substream); 672 if (channel >= runtime->channels) 673 return -EINVAL; 674 memset(info, 0, sizeof(*info)); 675 info->channel = channel; 676 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 677 } 678 679 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 680 struct snd_pcm_channel_info __user * _info) 681 { 682 struct snd_pcm_channel_info info; 683 int res; 684 685 if (copy_from_user(&info, _info, sizeof(info))) 686 return -EFAULT; 687 res = snd_pcm_channel_info(substream, &info); 688 if (res < 0) 689 return res; 690 if (copy_to_user(_info, &info, sizeof(info))) 691 return -EFAULT; 692 return 0; 693 } 694 695 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 696 { 697 struct snd_pcm_runtime *runtime = substream->runtime; 698 if (runtime->trigger_master == NULL) 699 return; 700 if (runtime->trigger_master == substream) { 701 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 702 } else { 703 snd_pcm_trigger_tstamp(runtime->trigger_master); 704 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 705 } 706 runtime->trigger_master = NULL; 707 } 708 709 struct action_ops { 710 int (*pre_action)(struct snd_pcm_substream *substream, int state); 711 int (*do_action)(struct snd_pcm_substream *substream, int state); 712 void (*undo_action)(struct snd_pcm_substream *substream, int state); 713 void (*post_action)(struct snd_pcm_substream *substream, int state); 714 }; 715 716 /* 717 * this functions is core for handling of linked stream 718 * Note: the stream state might be changed also on failure 719 * Note2: call with calling stream lock + link lock 720 */ 721 static int snd_pcm_action_group(struct action_ops *ops, 722 struct snd_pcm_substream *substream, 723 int state, int do_lock) 724 { 725 struct snd_pcm_substream *s = NULL; 726 struct snd_pcm_substream *s1; 727 int res = 0; 728 729 snd_pcm_group_for_each_entry(s, substream) { 730 if (do_lock && s != substream) 731 spin_lock_nested(&s->self_group.lock, 732 SINGLE_DEPTH_NESTING); 733 res = ops->pre_action(s, state); 734 if (res < 0) 735 goto _unlock; 736 } 737 snd_pcm_group_for_each_entry(s, substream) { 738 res = ops->do_action(s, state); 739 if (res < 0) { 740 if (ops->undo_action) { 741 snd_pcm_group_for_each_entry(s1, substream) { 742 if (s1 == s) /* failed stream */ 743 break; 744 ops->undo_action(s1, state); 745 } 746 } 747 s = NULL; /* unlock all */ 748 goto _unlock; 749 } 750 } 751 snd_pcm_group_for_each_entry(s, substream) { 752 ops->post_action(s, state); 753 } 754 _unlock: 755 if (do_lock) { 756 /* unlock streams */ 757 snd_pcm_group_for_each_entry(s1, substream) { 758 if (s1 != substream) 759 spin_unlock(&s1->self_group.lock); 760 if (s1 == s) /* end */ 761 break; 762 } 763 } 764 return res; 765 } 766 767 /* 768 * Note: call with stream lock 769 */ 770 static int snd_pcm_action_single(struct action_ops *ops, 771 struct snd_pcm_substream *substream, 772 int state) 773 { 774 int res; 775 776 res = ops->pre_action(substream, state); 777 if (res < 0) 778 return res; 779 res = ops->do_action(substream, state); 780 if (res == 0) 781 ops->post_action(substream, state); 782 else if (ops->undo_action) 783 ops->undo_action(substream, state); 784 return res; 785 } 786 787 /* 788 * Note: call with stream lock 789 */ 790 static int snd_pcm_action(struct action_ops *ops, 791 struct snd_pcm_substream *substream, 792 int state) 793 { 794 int res; 795 796 if (snd_pcm_stream_linked(substream)) { 797 if (!spin_trylock(&substream->group->lock)) { 798 spin_unlock(&substream->self_group.lock); 799 spin_lock(&substream->group->lock); 800 spin_lock(&substream->self_group.lock); 801 } 802 res = snd_pcm_action_group(ops, substream, state, 1); 803 spin_unlock(&substream->group->lock); 804 } else { 805 res = snd_pcm_action_single(ops, substream, state); 806 } 807 return res; 808 } 809 810 /* 811 * Note: don't use any locks before 812 */ 813 static int snd_pcm_action_lock_irq(struct action_ops *ops, 814 struct snd_pcm_substream *substream, 815 int state) 816 { 817 int res; 818 819 read_lock_irq(&snd_pcm_link_rwlock); 820 if (snd_pcm_stream_linked(substream)) { 821 spin_lock(&substream->group->lock); 822 spin_lock(&substream->self_group.lock); 823 res = snd_pcm_action_group(ops, substream, state, 1); 824 spin_unlock(&substream->self_group.lock); 825 spin_unlock(&substream->group->lock); 826 } else { 827 spin_lock(&substream->self_group.lock); 828 res = snd_pcm_action_single(ops, substream, state); 829 spin_unlock(&substream->self_group.lock); 830 } 831 read_unlock_irq(&snd_pcm_link_rwlock); 832 return res; 833 } 834 835 /* 836 */ 837 static int snd_pcm_action_nonatomic(struct action_ops *ops, 838 struct snd_pcm_substream *substream, 839 int state) 840 { 841 int res; 842 843 down_read(&snd_pcm_link_rwsem); 844 if (snd_pcm_stream_linked(substream)) 845 res = snd_pcm_action_group(ops, substream, state, 0); 846 else 847 res = snd_pcm_action_single(ops, substream, state); 848 up_read(&snd_pcm_link_rwsem); 849 return res; 850 } 851 852 /* 853 * start callbacks 854 */ 855 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 856 { 857 struct snd_pcm_runtime *runtime = substream->runtime; 858 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 859 return -EBADFD; 860 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 861 !snd_pcm_playback_data(substream)) 862 return -EPIPE; 863 runtime->trigger_master = substream; 864 return 0; 865 } 866 867 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 868 { 869 if (substream->runtime->trigger_master != substream) 870 return 0; 871 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 872 } 873 874 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 875 { 876 if (substream->runtime->trigger_master == substream) 877 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 878 } 879 880 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 881 { 882 struct snd_pcm_runtime *runtime = substream->runtime; 883 snd_pcm_trigger_tstamp(substream); 884 runtime->hw_ptr_jiffies = jiffies; 885 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 886 runtime->rate; 887 runtime->status->state = state; 888 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 889 runtime->silence_size > 0) 890 snd_pcm_playback_silence(substream, ULONG_MAX); 891 if (substream->timer) 892 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, 893 &runtime->trigger_tstamp); 894 } 895 896 static struct action_ops snd_pcm_action_start = { 897 .pre_action = snd_pcm_pre_start, 898 .do_action = snd_pcm_do_start, 899 .undo_action = snd_pcm_undo_start, 900 .post_action = snd_pcm_post_start 901 }; 902 903 /** 904 * snd_pcm_start - start all linked streams 905 * @substream: the PCM substream instance 906 * 907 * Return: Zero if successful, or a negative error code. 908 */ 909 int snd_pcm_start(struct snd_pcm_substream *substream) 910 { 911 return snd_pcm_action(&snd_pcm_action_start, substream, 912 SNDRV_PCM_STATE_RUNNING); 913 } 914 915 /* 916 * stop callbacks 917 */ 918 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 919 { 920 struct snd_pcm_runtime *runtime = substream->runtime; 921 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 922 return -EBADFD; 923 runtime->trigger_master = substream; 924 return 0; 925 } 926 927 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 928 { 929 if (substream->runtime->trigger_master == substream && 930 snd_pcm_running(substream)) 931 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 932 return 0; /* unconditonally stop all substreams */ 933 } 934 935 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 936 { 937 struct snd_pcm_runtime *runtime = substream->runtime; 938 if (runtime->status->state != state) { 939 snd_pcm_trigger_tstamp(substream); 940 if (substream->timer) 941 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 942 &runtime->trigger_tstamp); 943 runtime->status->state = state; 944 } 945 wake_up(&runtime->sleep); 946 wake_up(&runtime->tsleep); 947 } 948 949 static struct action_ops snd_pcm_action_stop = { 950 .pre_action = snd_pcm_pre_stop, 951 .do_action = snd_pcm_do_stop, 952 .post_action = snd_pcm_post_stop 953 }; 954 955 /** 956 * snd_pcm_stop - try to stop all running streams in the substream group 957 * @substream: the PCM substream instance 958 * @state: PCM state after stopping the stream 959 * 960 * The state of each stream is then changed to the given state unconditionally. 961 * 962 * Return: Zero if successful, or a negative error code. 963 */ 964 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 965 { 966 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 967 } 968 969 EXPORT_SYMBOL(snd_pcm_stop); 970 971 /** 972 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 973 * @substream: the PCM substream 974 * 975 * After stopping, the state is changed to SETUP. 976 * Unlike snd_pcm_stop(), this affects only the given stream. 977 * 978 * Return: Zero if succesful, or a negative error code. 979 */ 980 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 981 { 982 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 983 SNDRV_PCM_STATE_SETUP); 984 } 985 986 /* 987 * pause callbacks 988 */ 989 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 990 { 991 struct snd_pcm_runtime *runtime = substream->runtime; 992 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 993 return -ENOSYS; 994 if (push) { 995 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 996 return -EBADFD; 997 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 998 return -EBADFD; 999 runtime->trigger_master = substream; 1000 return 0; 1001 } 1002 1003 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 1004 { 1005 if (substream->runtime->trigger_master != substream) 1006 return 0; 1007 /* some drivers might use hw_ptr to recover from the pause - 1008 update the hw_ptr now */ 1009 if (push) 1010 snd_pcm_update_hw_ptr(substream); 1011 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 1012 * a delta between the current jiffies, this gives a large enough 1013 * delta, effectively to skip the check once. 1014 */ 1015 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1016 return substream->ops->trigger(substream, 1017 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1018 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1019 } 1020 1021 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1022 { 1023 if (substream->runtime->trigger_master == substream) 1024 substream->ops->trigger(substream, 1025 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1026 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1027 } 1028 1029 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1030 { 1031 struct snd_pcm_runtime *runtime = substream->runtime; 1032 snd_pcm_trigger_tstamp(substream); 1033 if (push) { 1034 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1035 if (substream->timer) 1036 snd_timer_notify(substream->timer, 1037 SNDRV_TIMER_EVENT_MPAUSE, 1038 &runtime->trigger_tstamp); 1039 wake_up(&runtime->sleep); 1040 wake_up(&runtime->tsleep); 1041 } else { 1042 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1043 if (substream->timer) 1044 snd_timer_notify(substream->timer, 1045 SNDRV_TIMER_EVENT_MCONTINUE, 1046 &runtime->trigger_tstamp); 1047 } 1048 } 1049 1050 static struct action_ops snd_pcm_action_pause = { 1051 .pre_action = snd_pcm_pre_pause, 1052 .do_action = snd_pcm_do_pause, 1053 .undo_action = snd_pcm_undo_pause, 1054 .post_action = snd_pcm_post_pause 1055 }; 1056 1057 /* 1058 * Push/release the pause for all linked streams. 1059 */ 1060 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1061 { 1062 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1063 } 1064 1065 #ifdef CONFIG_PM 1066 /* suspend */ 1067 1068 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1069 { 1070 struct snd_pcm_runtime *runtime = substream->runtime; 1071 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1072 return -EBUSY; 1073 runtime->trigger_master = substream; 1074 return 0; 1075 } 1076 1077 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1078 { 1079 struct snd_pcm_runtime *runtime = substream->runtime; 1080 if (runtime->trigger_master != substream) 1081 return 0; 1082 if (! snd_pcm_running(substream)) 1083 return 0; 1084 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1085 return 0; /* suspend unconditionally */ 1086 } 1087 1088 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1089 { 1090 struct snd_pcm_runtime *runtime = substream->runtime; 1091 snd_pcm_trigger_tstamp(substream); 1092 if (substream->timer) 1093 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1094 &runtime->trigger_tstamp); 1095 runtime->status->suspended_state = runtime->status->state; 1096 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1097 wake_up(&runtime->sleep); 1098 wake_up(&runtime->tsleep); 1099 } 1100 1101 static struct action_ops snd_pcm_action_suspend = { 1102 .pre_action = snd_pcm_pre_suspend, 1103 .do_action = snd_pcm_do_suspend, 1104 .post_action = snd_pcm_post_suspend 1105 }; 1106 1107 /** 1108 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1109 * @substream: the PCM substream 1110 * 1111 * After this call, all streams are changed to SUSPENDED state. 1112 * 1113 * Return: Zero if successful (or @substream is %NULL), or a negative error 1114 * code. 1115 */ 1116 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1117 { 1118 int err; 1119 unsigned long flags; 1120 1121 if (! substream) 1122 return 0; 1123 1124 snd_pcm_stream_lock_irqsave(substream, flags); 1125 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1126 snd_pcm_stream_unlock_irqrestore(substream, flags); 1127 return err; 1128 } 1129 1130 EXPORT_SYMBOL(snd_pcm_suspend); 1131 1132 /** 1133 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1134 * @pcm: the PCM instance 1135 * 1136 * After this call, all streams are changed to SUSPENDED state. 1137 * 1138 * Return: Zero if successful (or @pcm is %NULL), or a negative error code. 1139 */ 1140 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1141 { 1142 struct snd_pcm_substream *substream; 1143 int stream, err = 0; 1144 1145 if (! pcm) 1146 return 0; 1147 1148 for (stream = 0; stream < 2; stream++) { 1149 for (substream = pcm->streams[stream].substream; 1150 substream; substream = substream->next) { 1151 /* FIXME: the open/close code should lock this as well */ 1152 if (substream->runtime == NULL) 1153 continue; 1154 err = snd_pcm_suspend(substream); 1155 if (err < 0 && err != -EBUSY) 1156 return err; 1157 } 1158 } 1159 return 0; 1160 } 1161 1162 EXPORT_SYMBOL(snd_pcm_suspend_all); 1163 1164 /* resume */ 1165 1166 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1167 { 1168 struct snd_pcm_runtime *runtime = substream->runtime; 1169 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1170 return -ENOSYS; 1171 runtime->trigger_master = substream; 1172 return 0; 1173 } 1174 1175 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1176 { 1177 struct snd_pcm_runtime *runtime = substream->runtime; 1178 if (runtime->trigger_master != substream) 1179 return 0; 1180 /* DMA not running previously? */ 1181 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1182 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1183 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1184 return 0; 1185 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1186 } 1187 1188 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1189 { 1190 if (substream->runtime->trigger_master == substream && 1191 snd_pcm_running(substream)) 1192 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1193 } 1194 1195 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1196 { 1197 struct snd_pcm_runtime *runtime = substream->runtime; 1198 snd_pcm_trigger_tstamp(substream); 1199 if (substream->timer) 1200 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1201 &runtime->trigger_tstamp); 1202 runtime->status->state = runtime->status->suspended_state; 1203 } 1204 1205 static struct action_ops snd_pcm_action_resume = { 1206 .pre_action = snd_pcm_pre_resume, 1207 .do_action = snd_pcm_do_resume, 1208 .undo_action = snd_pcm_undo_resume, 1209 .post_action = snd_pcm_post_resume 1210 }; 1211 1212 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1213 { 1214 struct snd_card *card = substream->pcm->card; 1215 int res; 1216 1217 snd_power_lock(card); 1218 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1219 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1220 snd_power_unlock(card); 1221 return res; 1222 } 1223 1224 #else 1225 1226 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1227 { 1228 return -ENOSYS; 1229 } 1230 1231 #endif /* CONFIG_PM */ 1232 1233 /* 1234 * xrun ioctl 1235 * 1236 * Change the RUNNING stream(s) to XRUN state. 1237 */ 1238 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1239 { 1240 struct snd_card *card = substream->pcm->card; 1241 struct snd_pcm_runtime *runtime = substream->runtime; 1242 int result; 1243 1244 snd_power_lock(card); 1245 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1246 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1247 if (result < 0) 1248 goto _unlock; 1249 } 1250 1251 snd_pcm_stream_lock_irq(substream); 1252 switch (runtime->status->state) { 1253 case SNDRV_PCM_STATE_XRUN: 1254 result = 0; /* already there */ 1255 break; 1256 case SNDRV_PCM_STATE_RUNNING: 1257 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1258 break; 1259 default: 1260 result = -EBADFD; 1261 } 1262 snd_pcm_stream_unlock_irq(substream); 1263 _unlock: 1264 snd_power_unlock(card); 1265 return result; 1266 } 1267 1268 /* 1269 * reset ioctl 1270 */ 1271 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1272 { 1273 struct snd_pcm_runtime *runtime = substream->runtime; 1274 switch (runtime->status->state) { 1275 case SNDRV_PCM_STATE_RUNNING: 1276 case SNDRV_PCM_STATE_PREPARED: 1277 case SNDRV_PCM_STATE_PAUSED: 1278 case SNDRV_PCM_STATE_SUSPENDED: 1279 return 0; 1280 default: 1281 return -EBADFD; 1282 } 1283 } 1284 1285 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1286 { 1287 struct snd_pcm_runtime *runtime = substream->runtime; 1288 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1289 if (err < 0) 1290 return err; 1291 runtime->hw_ptr_base = 0; 1292 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1293 runtime->status->hw_ptr % runtime->period_size; 1294 runtime->silence_start = runtime->status->hw_ptr; 1295 runtime->silence_filled = 0; 1296 return 0; 1297 } 1298 1299 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1300 { 1301 struct snd_pcm_runtime *runtime = substream->runtime; 1302 runtime->control->appl_ptr = runtime->status->hw_ptr; 1303 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1304 runtime->silence_size > 0) 1305 snd_pcm_playback_silence(substream, ULONG_MAX); 1306 } 1307 1308 static struct action_ops snd_pcm_action_reset = { 1309 .pre_action = snd_pcm_pre_reset, 1310 .do_action = snd_pcm_do_reset, 1311 .post_action = snd_pcm_post_reset 1312 }; 1313 1314 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1315 { 1316 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1317 } 1318 1319 /* 1320 * prepare ioctl 1321 */ 1322 /* we use the second argument for updating f_flags */ 1323 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1324 int f_flags) 1325 { 1326 struct snd_pcm_runtime *runtime = substream->runtime; 1327 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1328 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1329 return -EBADFD; 1330 if (snd_pcm_running(substream)) 1331 return -EBUSY; 1332 substream->f_flags = f_flags; 1333 return 0; 1334 } 1335 1336 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1337 { 1338 int err; 1339 err = substream->ops->prepare(substream); 1340 if (err < 0) 1341 return err; 1342 return snd_pcm_do_reset(substream, 0); 1343 } 1344 1345 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1346 { 1347 struct snd_pcm_runtime *runtime = substream->runtime; 1348 runtime->control->appl_ptr = runtime->status->hw_ptr; 1349 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1350 } 1351 1352 static struct action_ops snd_pcm_action_prepare = { 1353 .pre_action = snd_pcm_pre_prepare, 1354 .do_action = snd_pcm_do_prepare, 1355 .post_action = snd_pcm_post_prepare 1356 }; 1357 1358 /** 1359 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1360 * @substream: the PCM substream instance 1361 * @file: file to refer f_flags 1362 * 1363 * Return: Zero if successful, or a negative error code. 1364 */ 1365 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1366 struct file *file) 1367 { 1368 int res; 1369 struct snd_card *card = substream->pcm->card; 1370 int f_flags; 1371 1372 if (file) 1373 f_flags = file->f_flags; 1374 else 1375 f_flags = substream->f_flags; 1376 1377 snd_power_lock(card); 1378 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1379 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1380 substream, f_flags); 1381 snd_power_unlock(card); 1382 return res; 1383 } 1384 1385 /* 1386 * drain ioctl 1387 */ 1388 1389 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1390 { 1391 struct snd_pcm_runtime *runtime = substream->runtime; 1392 switch (runtime->status->state) { 1393 case SNDRV_PCM_STATE_OPEN: 1394 case SNDRV_PCM_STATE_DISCONNECTED: 1395 case SNDRV_PCM_STATE_SUSPENDED: 1396 return -EBADFD; 1397 } 1398 runtime->trigger_master = substream; 1399 return 0; 1400 } 1401 1402 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1403 { 1404 struct snd_pcm_runtime *runtime = substream->runtime; 1405 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1406 switch (runtime->status->state) { 1407 case SNDRV_PCM_STATE_PREPARED: 1408 /* start playback stream if possible */ 1409 if (! snd_pcm_playback_empty(substream)) { 1410 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1411 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1412 } 1413 break; 1414 case SNDRV_PCM_STATE_RUNNING: 1415 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1416 break; 1417 case SNDRV_PCM_STATE_XRUN: 1418 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1419 break; 1420 default: 1421 break; 1422 } 1423 } else { 1424 /* stop running stream */ 1425 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1426 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1427 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1428 snd_pcm_do_stop(substream, new_state); 1429 snd_pcm_post_stop(substream, new_state); 1430 } 1431 } 1432 return 0; 1433 } 1434 1435 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1436 { 1437 } 1438 1439 static struct action_ops snd_pcm_action_drain_init = { 1440 .pre_action = snd_pcm_pre_drain_init, 1441 .do_action = snd_pcm_do_drain_init, 1442 .post_action = snd_pcm_post_drain_init 1443 }; 1444 1445 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1446 1447 /* 1448 * Drain the stream(s). 1449 * When the substream is linked, sync until the draining of all playback streams 1450 * is finished. 1451 * After this call, all streams are supposed to be either SETUP or DRAINING 1452 * (capture only) state. 1453 */ 1454 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1455 struct file *file) 1456 { 1457 struct snd_card *card; 1458 struct snd_pcm_runtime *runtime; 1459 struct snd_pcm_substream *s; 1460 wait_queue_t wait; 1461 int result = 0; 1462 int nonblock = 0; 1463 1464 card = substream->pcm->card; 1465 runtime = substream->runtime; 1466 1467 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1468 return -EBADFD; 1469 1470 snd_power_lock(card); 1471 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1472 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1473 if (result < 0) { 1474 snd_power_unlock(card); 1475 return result; 1476 } 1477 } 1478 1479 if (file) { 1480 if (file->f_flags & O_NONBLOCK) 1481 nonblock = 1; 1482 } else if (substream->f_flags & O_NONBLOCK) 1483 nonblock = 1; 1484 1485 down_read(&snd_pcm_link_rwsem); 1486 snd_pcm_stream_lock_irq(substream); 1487 /* resume pause */ 1488 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1489 snd_pcm_pause(substream, 0); 1490 1491 /* pre-start/stop - all running streams are changed to DRAINING state */ 1492 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1493 if (result < 0) 1494 goto unlock; 1495 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1496 if (nonblock) { 1497 result = -EAGAIN; 1498 goto unlock; 1499 } 1500 1501 for (;;) { 1502 long tout; 1503 struct snd_pcm_runtime *to_check; 1504 if (signal_pending(current)) { 1505 result = -ERESTARTSYS; 1506 break; 1507 } 1508 /* find a substream to drain */ 1509 to_check = NULL; 1510 snd_pcm_group_for_each_entry(s, substream) { 1511 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1512 continue; 1513 runtime = s->runtime; 1514 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1515 to_check = runtime; 1516 break; 1517 } 1518 } 1519 if (!to_check) 1520 break; /* all drained */ 1521 init_waitqueue_entry(&wait, current); 1522 add_wait_queue(&to_check->sleep, &wait); 1523 snd_pcm_stream_unlock_irq(substream); 1524 up_read(&snd_pcm_link_rwsem); 1525 snd_power_unlock(card); 1526 if (runtime->no_period_wakeup) 1527 tout = MAX_SCHEDULE_TIMEOUT; 1528 else { 1529 tout = 10; 1530 if (runtime->rate) { 1531 long t = runtime->period_size * 2 / runtime->rate; 1532 tout = max(t, tout); 1533 } 1534 tout = msecs_to_jiffies(tout * 1000); 1535 } 1536 tout = schedule_timeout_interruptible(tout); 1537 snd_power_lock(card); 1538 down_read(&snd_pcm_link_rwsem); 1539 snd_pcm_stream_lock_irq(substream); 1540 remove_wait_queue(&to_check->sleep, &wait); 1541 if (card->shutdown) { 1542 result = -ENODEV; 1543 break; 1544 } 1545 if (tout == 0) { 1546 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1547 result = -ESTRPIPE; 1548 else { 1549 dev_dbg(substream->pcm->card->dev, 1550 "playback drain error (DMA or IRQ trouble?)\n"); 1551 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1552 result = -EIO; 1553 } 1554 break; 1555 } 1556 } 1557 1558 unlock: 1559 snd_pcm_stream_unlock_irq(substream); 1560 up_read(&snd_pcm_link_rwsem); 1561 snd_power_unlock(card); 1562 1563 return result; 1564 } 1565 1566 /* 1567 * drop ioctl 1568 * 1569 * Immediately put all linked substreams into SETUP state. 1570 */ 1571 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1572 { 1573 struct snd_pcm_runtime *runtime; 1574 int result = 0; 1575 1576 if (PCM_RUNTIME_CHECK(substream)) 1577 return -ENXIO; 1578 runtime = substream->runtime; 1579 1580 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1581 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1582 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1583 return -EBADFD; 1584 1585 snd_pcm_stream_lock_irq(substream); 1586 /* resume pause */ 1587 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1588 snd_pcm_pause(substream, 0); 1589 1590 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1591 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1592 snd_pcm_stream_unlock_irq(substream); 1593 1594 return result; 1595 } 1596 1597 1598 static bool is_pcm_file(struct file *file) 1599 { 1600 struct inode *inode = file_inode(file); 1601 unsigned int minor; 1602 1603 if (!S_ISCHR(inode->i_mode) || imajor(inode) != snd_major) 1604 return false; 1605 minor = iminor(inode); 1606 return snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) || 1607 snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE); 1608 } 1609 1610 /* 1611 * PCM link handling 1612 */ 1613 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1614 { 1615 int res = 0; 1616 struct snd_pcm_file *pcm_file; 1617 struct snd_pcm_substream *substream1; 1618 struct snd_pcm_group *group; 1619 struct fd f = fdget(fd); 1620 1621 if (!f.file) 1622 return -EBADFD; 1623 if (!is_pcm_file(f.file)) { 1624 res = -EBADFD; 1625 goto _badf; 1626 } 1627 pcm_file = f.file->private_data; 1628 substream1 = pcm_file->substream; 1629 group = kmalloc(sizeof(*group), GFP_KERNEL); 1630 if (!group) { 1631 res = -ENOMEM; 1632 goto _nolock; 1633 } 1634 down_write(&snd_pcm_link_rwsem); 1635 write_lock_irq(&snd_pcm_link_rwlock); 1636 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1637 substream->runtime->status->state != substream1->runtime->status->state) { 1638 res = -EBADFD; 1639 goto _end; 1640 } 1641 if (snd_pcm_stream_linked(substream1)) { 1642 res = -EALREADY; 1643 goto _end; 1644 } 1645 if (!snd_pcm_stream_linked(substream)) { 1646 substream->group = group; 1647 group = NULL; 1648 spin_lock_init(&substream->group->lock); 1649 INIT_LIST_HEAD(&substream->group->substreams); 1650 list_add_tail(&substream->link_list, &substream->group->substreams); 1651 substream->group->count = 1; 1652 } 1653 list_add_tail(&substream1->link_list, &substream->group->substreams); 1654 substream->group->count++; 1655 substream1->group = substream->group; 1656 _end: 1657 write_unlock_irq(&snd_pcm_link_rwlock); 1658 up_write(&snd_pcm_link_rwsem); 1659 _nolock: 1660 snd_card_unref(substream1->pcm->card); 1661 kfree(group); 1662 _badf: 1663 fdput(f); 1664 return res; 1665 } 1666 1667 static void relink_to_local(struct snd_pcm_substream *substream) 1668 { 1669 substream->group = &substream->self_group; 1670 INIT_LIST_HEAD(&substream->self_group.substreams); 1671 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1672 } 1673 1674 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1675 { 1676 struct snd_pcm_substream *s; 1677 int res = 0; 1678 1679 down_write(&snd_pcm_link_rwsem); 1680 write_lock_irq(&snd_pcm_link_rwlock); 1681 if (!snd_pcm_stream_linked(substream)) { 1682 res = -EALREADY; 1683 goto _end; 1684 } 1685 list_del(&substream->link_list); 1686 substream->group->count--; 1687 if (substream->group->count == 1) { /* detach the last stream, too */ 1688 snd_pcm_group_for_each_entry(s, substream) { 1689 relink_to_local(s); 1690 break; 1691 } 1692 kfree(substream->group); 1693 } 1694 relink_to_local(substream); 1695 _end: 1696 write_unlock_irq(&snd_pcm_link_rwlock); 1697 up_write(&snd_pcm_link_rwsem); 1698 return res; 1699 } 1700 1701 /* 1702 * hw configurator 1703 */ 1704 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1705 struct snd_pcm_hw_rule *rule) 1706 { 1707 struct snd_interval t; 1708 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1709 hw_param_interval_c(params, rule->deps[1]), &t); 1710 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1711 } 1712 1713 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1714 struct snd_pcm_hw_rule *rule) 1715 { 1716 struct snd_interval t; 1717 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1718 hw_param_interval_c(params, rule->deps[1]), &t); 1719 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1720 } 1721 1722 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1723 struct snd_pcm_hw_rule *rule) 1724 { 1725 struct snd_interval t; 1726 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1727 hw_param_interval_c(params, rule->deps[1]), 1728 (unsigned long) rule->private, &t); 1729 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1730 } 1731 1732 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1733 struct snd_pcm_hw_rule *rule) 1734 { 1735 struct snd_interval t; 1736 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1737 (unsigned long) rule->private, 1738 hw_param_interval_c(params, rule->deps[1]), &t); 1739 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1740 } 1741 1742 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1743 struct snd_pcm_hw_rule *rule) 1744 { 1745 unsigned int k; 1746 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1747 struct snd_mask m; 1748 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1749 snd_mask_any(&m); 1750 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1751 int bits; 1752 if (! snd_mask_test(mask, k)) 1753 continue; 1754 bits = snd_pcm_format_physical_width(k); 1755 if (bits <= 0) 1756 continue; /* ignore invalid formats */ 1757 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1758 snd_mask_reset(&m, k); 1759 } 1760 return snd_mask_refine(mask, &m); 1761 } 1762 1763 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1764 struct snd_pcm_hw_rule *rule) 1765 { 1766 struct snd_interval t; 1767 unsigned int k; 1768 t.min = UINT_MAX; 1769 t.max = 0; 1770 t.openmin = 0; 1771 t.openmax = 0; 1772 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1773 int bits; 1774 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1775 continue; 1776 bits = snd_pcm_format_physical_width(k); 1777 if (bits <= 0) 1778 continue; /* ignore invalid formats */ 1779 if (t.min > (unsigned)bits) 1780 t.min = bits; 1781 if (t.max < (unsigned)bits) 1782 t.max = bits; 1783 } 1784 t.integer = 1; 1785 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1786 } 1787 1788 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1789 #error "Change this table" 1790 #endif 1791 1792 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1793 48000, 64000, 88200, 96000, 176400, 192000 }; 1794 1795 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1796 .count = ARRAY_SIZE(rates), 1797 .list = rates, 1798 }; 1799 1800 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1801 struct snd_pcm_hw_rule *rule) 1802 { 1803 struct snd_pcm_hardware *hw = rule->private; 1804 return snd_interval_list(hw_param_interval(params, rule->var), 1805 snd_pcm_known_rates.count, 1806 snd_pcm_known_rates.list, hw->rates); 1807 } 1808 1809 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1810 struct snd_pcm_hw_rule *rule) 1811 { 1812 struct snd_interval t; 1813 struct snd_pcm_substream *substream = rule->private; 1814 t.min = 0; 1815 t.max = substream->buffer_bytes_max; 1816 t.openmin = 0; 1817 t.openmax = 0; 1818 t.integer = 1; 1819 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1820 } 1821 1822 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1823 { 1824 struct snd_pcm_runtime *runtime = substream->runtime; 1825 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1826 int k, err; 1827 1828 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1829 snd_mask_any(constrs_mask(constrs, k)); 1830 } 1831 1832 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1833 snd_interval_any(constrs_interval(constrs, k)); 1834 } 1835 1836 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1837 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1838 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1839 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1840 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1841 1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1843 snd_pcm_hw_rule_format, NULL, 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_sample_bits, NULL, 1849 SNDRV_PCM_HW_PARAM_FORMAT, 1850 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1851 if (err < 0) 1852 return err; 1853 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1854 snd_pcm_hw_rule_div, NULL, 1855 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1856 if (err < 0) 1857 return err; 1858 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1859 snd_pcm_hw_rule_mul, NULL, 1860 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1861 if (err < 0) 1862 return err; 1863 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1864 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1865 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1866 if (err < 0) 1867 return err; 1868 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1869 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1870 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 1871 if (err < 0) 1872 return err; 1873 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1874 snd_pcm_hw_rule_div, NULL, 1875 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1876 if (err < 0) 1877 return err; 1878 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1879 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1880 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 1881 if (err < 0) 1882 return err; 1883 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1884 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1885 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 1886 if (err < 0) 1887 return err; 1888 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 1889 snd_pcm_hw_rule_div, NULL, 1890 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1891 if (err < 0) 1892 return err; 1893 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1894 snd_pcm_hw_rule_div, NULL, 1895 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1896 if (err < 0) 1897 return err; 1898 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1899 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1900 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1901 if (err < 0) 1902 return err; 1903 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1904 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1905 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1906 if (err < 0) 1907 return err; 1908 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1909 snd_pcm_hw_rule_mul, NULL, 1910 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1911 if (err < 0) 1912 return err; 1913 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1914 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1915 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1916 if (err < 0) 1917 return err; 1918 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1919 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1920 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1921 if (err < 0) 1922 return err; 1923 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1924 snd_pcm_hw_rule_muldivk, (void*) 8, 1925 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1926 if (err < 0) 1927 return err; 1928 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1929 snd_pcm_hw_rule_muldivk, (void*) 8, 1930 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1931 if (err < 0) 1932 return err; 1933 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1934 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1935 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1936 if (err < 0) 1937 return err; 1938 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 1939 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1940 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1941 if (err < 0) 1942 return err; 1943 return 0; 1944 } 1945 1946 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 1947 { 1948 struct snd_pcm_runtime *runtime = substream->runtime; 1949 struct snd_pcm_hardware *hw = &runtime->hw; 1950 int err; 1951 unsigned int mask = 0; 1952 1953 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1954 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 1955 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1956 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 1957 if (hw->info & SNDRV_PCM_INFO_MMAP) { 1958 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1959 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 1960 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1961 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 1962 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 1963 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 1964 } 1965 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 1966 if (err < 0) 1967 return err; 1968 1969 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 1970 if (err < 0) 1971 return err; 1972 1973 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 1974 if (err < 0) 1975 return err; 1976 1977 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 1978 hw->channels_min, hw->channels_max); 1979 if (err < 0) 1980 return err; 1981 1982 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 1983 hw->rate_min, hw->rate_max); 1984 if (err < 0) 1985 return err; 1986 1987 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1988 hw->period_bytes_min, hw->period_bytes_max); 1989 if (err < 0) 1990 return err; 1991 1992 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 1993 hw->periods_min, hw->periods_max); 1994 if (err < 0) 1995 return err; 1996 1997 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1998 hw->period_bytes_min, hw->buffer_bytes_max); 1999 if (err < 0) 2000 return err; 2001 2002 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 2003 snd_pcm_hw_rule_buffer_bytes_max, substream, 2004 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 2005 if (err < 0) 2006 return err; 2007 2008 /* FIXME: remove */ 2009 if (runtime->dma_bytes) { 2010 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2011 if (err < 0) 2012 return err; 2013 } 2014 2015 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2016 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2017 snd_pcm_hw_rule_rate, hw, 2018 SNDRV_PCM_HW_PARAM_RATE, -1); 2019 if (err < 0) 2020 return err; 2021 } 2022 2023 /* FIXME: this belong to lowlevel */ 2024 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2025 2026 return 0; 2027 } 2028 2029 static void pcm_release_private(struct snd_pcm_substream *substream) 2030 { 2031 snd_pcm_unlink(substream); 2032 } 2033 2034 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2035 { 2036 substream->ref_count--; 2037 if (substream->ref_count > 0) 2038 return; 2039 2040 snd_pcm_drop(substream); 2041 if (substream->hw_opened) { 2042 if (substream->ops->hw_free != NULL) 2043 substream->ops->hw_free(substream); 2044 substream->ops->close(substream); 2045 substream->hw_opened = 0; 2046 } 2047 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2048 pm_qos_remove_request(&substream->latency_pm_qos_req); 2049 if (substream->pcm_release) { 2050 substream->pcm_release(substream); 2051 substream->pcm_release = NULL; 2052 } 2053 snd_pcm_detach_substream(substream); 2054 } 2055 2056 EXPORT_SYMBOL(snd_pcm_release_substream); 2057 2058 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2059 struct file *file, 2060 struct snd_pcm_substream **rsubstream) 2061 { 2062 struct snd_pcm_substream *substream; 2063 int err; 2064 2065 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2066 if (err < 0) 2067 return err; 2068 if (substream->ref_count > 1) { 2069 *rsubstream = substream; 2070 return 0; 2071 } 2072 2073 err = snd_pcm_hw_constraints_init(substream); 2074 if (err < 0) { 2075 pcm_dbg(pcm, "snd_pcm_hw_constraints_init failed\n"); 2076 goto error; 2077 } 2078 2079 if ((err = substream->ops->open(substream)) < 0) 2080 goto error; 2081 2082 substream->hw_opened = 1; 2083 2084 err = snd_pcm_hw_constraints_complete(substream); 2085 if (err < 0) { 2086 pcm_dbg(pcm, "snd_pcm_hw_constraints_complete failed\n"); 2087 goto error; 2088 } 2089 2090 *rsubstream = substream; 2091 return 0; 2092 2093 error: 2094 snd_pcm_release_substream(substream); 2095 return err; 2096 } 2097 2098 EXPORT_SYMBOL(snd_pcm_open_substream); 2099 2100 static int snd_pcm_open_file(struct file *file, 2101 struct snd_pcm *pcm, 2102 int stream) 2103 { 2104 struct snd_pcm_file *pcm_file; 2105 struct snd_pcm_substream *substream; 2106 int err; 2107 2108 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2109 if (err < 0) 2110 return err; 2111 2112 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2113 if (pcm_file == NULL) { 2114 snd_pcm_release_substream(substream); 2115 return -ENOMEM; 2116 } 2117 pcm_file->substream = substream; 2118 if (substream->ref_count == 1) { 2119 substream->file = pcm_file; 2120 substream->pcm_release = pcm_release_private; 2121 } 2122 file->private_data = pcm_file; 2123 2124 return 0; 2125 } 2126 2127 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2128 { 2129 struct snd_pcm *pcm; 2130 int err = nonseekable_open(inode, file); 2131 if (err < 0) 2132 return err; 2133 pcm = snd_lookup_minor_data(iminor(inode), 2134 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2135 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2136 if (pcm) 2137 snd_card_unref(pcm->card); 2138 return err; 2139 } 2140 2141 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2142 { 2143 struct snd_pcm *pcm; 2144 int err = nonseekable_open(inode, file); 2145 if (err < 0) 2146 return err; 2147 pcm = snd_lookup_minor_data(iminor(inode), 2148 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2149 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2150 if (pcm) 2151 snd_card_unref(pcm->card); 2152 return err; 2153 } 2154 2155 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2156 { 2157 int err; 2158 wait_queue_t wait; 2159 2160 if (pcm == NULL) { 2161 err = -ENODEV; 2162 goto __error1; 2163 } 2164 err = snd_card_file_add(pcm->card, file); 2165 if (err < 0) 2166 goto __error1; 2167 if (!try_module_get(pcm->card->module)) { 2168 err = -EFAULT; 2169 goto __error2; 2170 } 2171 init_waitqueue_entry(&wait, current); 2172 add_wait_queue(&pcm->open_wait, &wait); 2173 mutex_lock(&pcm->open_mutex); 2174 while (1) { 2175 err = snd_pcm_open_file(file, pcm, stream); 2176 if (err >= 0) 2177 break; 2178 if (err == -EAGAIN) { 2179 if (file->f_flags & O_NONBLOCK) { 2180 err = -EBUSY; 2181 break; 2182 } 2183 } else 2184 break; 2185 set_current_state(TASK_INTERRUPTIBLE); 2186 mutex_unlock(&pcm->open_mutex); 2187 schedule(); 2188 mutex_lock(&pcm->open_mutex); 2189 if (pcm->card->shutdown) { 2190 err = -ENODEV; 2191 break; 2192 } 2193 if (signal_pending(current)) { 2194 err = -ERESTARTSYS; 2195 break; 2196 } 2197 } 2198 remove_wait_queue(&pcm->open_wait, &wait); 2199 mutex_unlock(&pcm->open_mutex); 2200 if (err < 0) 2201 goto __error; 2202 return err; 2203 2204 __error: 2205 module_put(pcm->card->module); 2206 __error2: 2207 snd_card_file_remove(pcm->card, file); 2208 __error1: 2209 return err; 2210 } 2211 2212 static int snd_pcm_release(struct inode *inode, struct file *file) 2213 { 2214 struct snd_pcm *pcm; 2215 struct snd_pcm_substream *substream; 2216 struct snd_pcm_file *pcm_file; 2217 2218 pcm_file = file->private_data; 2219 substream = pcm_file->substream; 2220 if (snd_BUG_ON(!substream)) 2221 return -ENXIO; 2222 pcm = substream->pcm; 2223 mutex_lock(&pcm->open_mutex); 2224 snd_pcm_release_substream(substream); 2225 kfree(pcm_file); 2226 mutex_unlock(&pcm->open_mutex); 2227 wake_up(&pcm->open_wait); 2228 module_put(pcm->card->module); 2229 snd_card_file_remove(pcm->card, file); 2230 return 0; 2231 } 2232 2233 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2234 snd_pcm_uframes_t frames) 2235 { 2236 struct snd_pcm_runtime *runtime = substream->runtime; 2237 snd_pcm_sframes_t appl_ptr; 2238 snd_pcm_sframes_t ret; 2239 snd_pcm_sframes_t hw_avail; 2240 2241 if (frames == 0) 2242 return 0; 2243 2244 snd_pcm_stream_lock_irq(substream); 2245 switch (runtime->status->state) { 2246 case SNDRV_PCM_STATE_PREPARED: 2247 break; 2248 case SNDRV_PCM_STATE_DRAINING: 2249 case SNDRV_PCM_STATE_RUNNING: 2250 if (snd_pcm_update_hw_ptr(substream) >= 0) 2251 break; 2252 /* Fall through */ 2253 case SNDRV_PCM_STATE_XRUN: 2254 ret = -EPIPE; 2255 goto __end; 2256 case SNDRV_PCM_STATE_SUSPENDED: 2257 ret = -ESTRPIPE; 2258 goto __end; 2259 default: 2260 ret = -EBADFD; 2261 goto __end; 2262 } 2263 2264 hw_avail = snd_pcm_playback_hw_avail(runtime); 2265 if (hw_avail <= 0) { 2266 ret = 0; 2267 goto __end; 2268 } 2269 if (frames > (snd_pcm_uframes_t)hw_avail) 2270 frames = hw_avail; 2271 appl_ptr = runtime->control->appl_ptr - frames; 2272 if (appl_ptr < 0) 2273 appl_ptr += runtime->boundary; 2274 runtime->control->appl_ptr = appl_ptr; 2275 ret = frames; 2276 __end: 2277 snd_pcm_stream_unlock_irq(substream); 2278 return ret; 2279 } 2280 2281 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2282 snd_pcm_uframes_t frames) 2283 { 2284 struct snd_pcm_runtime *runtime = substream->runtime; 2285 snd_pcm_sframes_t appl_ptr; 2286 snd_pcm_sframes_t ret; 2287 snd_pcm_sframes_t hw_avail; 2288 2289 if (frames == 0) 2290 return 0; 2291 2292 snd_pcm_stream_lock_irq(substream); 2293 switch (runtime->status->state) { 2294 case SNDRV_PCM_STATE_PREPARED: 2295 case SNDRV_PCM_STATE_DRAINING: 2296 break; 2297 case SNDRV_PCM_STATE_RUNNING: 2298 if (snd_pcm_update_hw_ptr(substream) >= 0) 2299 break; 2300 /* Fall through */ 2301 case SNDRV_PCM_STATE_XRUN: 2302 ret = -EPIPE; 2303 goto __end; 2304 case SNDRV_PCM_STATE_SUSPENDED: 2305 ret = -ESTRPIPE; 2306 goto __end; 2307 default: 2308 ret = -EBADFD; 2309 goto __end; 2310 } 2311 2312 hw_avail = snd_pcm_capture_hw_avail(runtime); 2313 if (hw_avail <= 0) { 2314 ret = 0; 2315 goto __end; 2316 } 2317 if (frames > (snd_pcm_uframes_t)hw_avail) 2318 frames = hw_avail; 2319 appl_ptr = runtime->control->appl_ptr - frames; 2320 if (appl_ptr < 0) 2321 appl_ptr += runtime->boundary; 2322 runtime->control->appl_ptr = appl_ptr; 2323 ret = frames; 2324 __end: 2325 snd_pcm_stream_unlock_irq(substream); 2326 return ret; 2327 } 2328 2329 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2330 snd_pcm_uframes_t frames) 2331 { 2332 struct snd_pcm_runtime *runtime = substream->runtime; 2333 snd_pcm_sframes_t appl_ptr; 2334 snd_pcm_sframes_t ret; 2335 snd_pcm_sframes_t avail; 2336 2337 if (frames == 0) 2338 return 0; 2339 2340 snd_pcm_stream_lock_irq(substream); 2341 switch (runtime->status->state) { 2342 case SNDRV_PCM_STATE_PREPARED: 2343 case SNDRV_PCM_STATE_PAUSED: 2344 break; 2345 case SNDRV_PCM_STATE_DRAINING: 2346 case SNDRV_PCM_STATE_RUNNING: 2347 if (snd_pcm_update_hw_ptr(substream) >= 0) 2348 break; 2349 /* Fall through */ 2350 case SNDRV_PCM_STATE_XRUN: 2351 ret = -EPIPE; 2352 goto __end; 2353 case SNDRV_PCM_STATE_SUSPENDED: 2354 ret = -ESTRPIPE; 2355 goto __end; 2356 default: 2357 ret = -EBADFD; 2358 goto __end; 2359 } 2360 2361 avail = snd_pcm_playback_avail(runtime); 2362 if (avail <= 0) { 2363 ret = 0; 2364 goto __end; 2365 } 2366 if (frames > (snd_pcm_uframes_t)avail) 2367 frames = avail; 2368 appl_ptr = runtime->control->appl_ptr + frames; 2369 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2370 appl_ptr -= runtime->boundary; 2371 runtime->control->appl_ptr = appl_ptr; 2372 ret = frames; 2373 __end: 2374 snd_pcm_stream_unlock_irq(substream); 2375 return ret; 2376 } 2377 2378 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2379 snd_pcm_uframes_t frames) 2380 { 2381 struct snd_pcm_runtime *runtime = substream->runtime; 2382 snd_pcm_sframes_t appl_ptr; 2383 snd_pcm_sframes_t ret; 2384 snd_pcm_sframes_t avail; 2385 2386 if (frames == 0) 2387 return 0; 2388 2389 snd_pcm_stream_lock_irq(substream); 2390 switch (runtime->status->state) { 2391 case SNDRV_PCM_STATE_PREPARED: 2392 case SNDRV_PCM_STATE_DRAINING: 2393 case SNDRV_PCM_STATE_PAUSED: 2394 break; 2395 case SNDRV_PCM_STATE_RUNNING: 2396 if (snd_pcm_update_hw_ptr(substream) >= 0) 2397 break; 2398 /* Fall through */ 2399 case SNDRV_PCM_STATE_XRUN: 2400 ret = -EPIPE; 2401 goto __end; 2402 case SNDRV_PCM_STATE_SUSPENDED: 2403 ret = -ESTRPIPE; 2404 goto __end; 2405 default: 2406 ret = -EBADFD; 2407 goto __end; 2408 } 2409 2410 avail = snd_pcm_capture_avail(runtime); 2411 if (avail <= 0) { 2412 ret = 0; 2413 goto __end; 2414 } 2415 if (frames > (snd_pcm_uframes_t)avail) 2416 frames = avail; 2417 appl_ptr = runtime->control->appl_ptr + frames; 2418 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2419 appl_ptr -= runtime->boundary; 2420 runtime->control->appl_ptr = appl_ptr; 2421 ret = frames; 2422 __end: 2423 snd_pcm_stream_unlock_irq(substream); 2424 return ret; 2425 } 2426 2427 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2428 { 2429 struct snd_pcm_runtime *runtime = substream->runtime; 2430 int err; 2431 2432 snd_pcm_stream_lock_irq(substream); 2433 switch (runtime->status->state) { 2434 case SNDRV_PCM_STATE_DRAINING: 2435 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2436 goto __badfd; 2437 /* Fall through */ 2438 case SNDRV_PCM_STATE_RUNNING: 2439 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2440 break; 2441 /* Fall through */ 2442 case SNDRV_PCM_STATE_PREPARED: 2443 case SNDRV_PCM_STATE_SUSPENDED: 2444 err = 0; 2445 break; 2446 case SNDRV_PCM_STATE_XRUN: 2447 err = -EPIPE; 2448 break; 2449 default: 2450 __badfd: 2451 err = -EBADFD; 2452 break; 2453 } 2454 snd_pcm_stream_unlock_irq(substream); 2455 return err; 2456 } 2457 2458 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2459 snd_pcm_sframes_t __user *res) 2460 { 2461 struct snd_pcm_runtime *runtime = substream->runtime; 2462 int err; 2463 snd_pcm_sframes_t n = 0; 2464 2465 snd_pcm_stream_lock_irq(substream); 2466 switch (runtime->status->state) { 2467 case SNDRV_PCM_STATE_DRAINING: 2468 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2469 goto __badfd; 2470 /* Fall through */ 2471 case SNDRV_PCM_STATE_RUNNING: 2472 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2473 break; 2474 /* Fall through */ 2475 case SNDRV_PCM_STATE_PREPARED: 2476 case SNDRV_PCM_STATE_SUSPENDED: 2477 err = 0; 2478 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2479 n = snd_pcm_playback_hw_avail(runtime); 2480 else 2481 n = snd_pcm_capture_avail(runtime); 2482 n += runtime->delay; 2483 break; 2484 case SNDRV_PCM_STATE_XRUN: 2485 err = -EPIPE; 2486 break; 2487 default: 2488 __badfd: 2489 err = -EBADFD; 2490 break; 2491 } 2492 snd_pcm_stream_unlock_irq(substream); 2493 if (!err) 2494 if (put_user(n, res)) 2495 err = -EFAULT; 2496 return err; 2497 } 2498 2499 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2500 struct snd_pcm_sync_ptr __user *_sync_ptr) 2501 { 2502 struct snd_pcm_runtime *runtime = substream->runtime; 2503 struct snd_pcm_sync_ptr sync_ptr; 2504 volatile struct snd_pcm_mmap_status *status; 2505 volatile struct snd_pcm_mmap_control *control; 2506 int err; 2507 2508 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2509 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2510 return -EFAULT; 2511 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2512 return -EFAULT; 2513 status = runtime->status; 2514 control = runtime->control; 2515 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2516 err = snd_pcm_hwsync(substream); 2517 if (err < 0) 2518 return err; 2519 } 2520 snd_pcm_stream_lock_irq(substream); 2521 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2522 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2523 else 2524 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2525 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2526 control->avail_min = sync_ptr.c.control.avail_min; 2527 else 2528 sync_ptr.c.control.avail_min = control->avail_min; 2529 sync_ptr.s.status.state = status->state; 2530 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2531 sync_ptr.s.status.tstamp = status->tstamp; 2532 sync_ptr.s.status.suspended_state = status->suspended_state; 2533 snd_pcm_stream_unlock_irq(substream); 2534 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2535 return -EFAULT; 2536 return 0; 2537 } 2538 2539 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2540 { 2541 struct snd_pcm_runtime *runtime = substream->runtime; 2542 int arg; 2543 2544 if (get_user(arg, _arg)) 2545 return -EFAULT; 2546 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2547 return -EINVAL; 2548 runtime->tstamp_type = arg; 2549 return 0; 2550 } 2551 2552 static int snd_pcm_common_ioctl1(struct file *file, 2553 struct snd_pcm_substream *substream, 2554 unsigned int cmd, void __user *arg) 2555 { 2556 switch (cmd) { 2557 case SNDRV_PCM_IOCTL_PVERSION: 2558 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2559 case SNDRV_PCM_IOCTL_INFO: 2560 return snd_pcm_info_user(substream, arg); 2561 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2562 return 0; 2563 case SNDRV_PCM_IOCTL_TTSTAMP: 2564 return snd_pcm_tstamp(substream, arg); 2565 case SNDRV_PCM_IOCTL_HW_REFINE: 2566 return snd_pcm_hw_refine_user(substream, arg); 2567 case SNDRV_PCM_IOCTL_HW_PARAMS: 2568 return snd_pcm_hw_params_user(substream, arg); 2569 case SNDRV_PCM_IOCTL_HW_FREE: 2570 return snd_pcm_hw_free(substream); 2571 case SNDRV_PCM_IOCTL_SW_PARAMS: 2572 return snd_pcm_sw_params_user(substream, arg); 2573 case SNDRV_PCM_IOCTL_STATUS: 2574 return snd_pcm_status_user(substream, arg); 2575 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2576 return snd_pcm_channel_info_user(substream, arg); 2577 case SNDRV_PCM_IOCTL_PREPARE: 2578 return snd_pcm_prepare(substream, file); 2579 case SNDRV_PCM_IOCTL_RESET: 2580 return snd_pcm_reset(substream); 2581 case SNDRV_PCM_IOCTL_START: 2582 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2583 case SNDRV_PCM_IOCTL_LINK: 2584 return snd_pcm_link(substream, (int)(unsigned long) arg); 2585 case SNDRV_PCM_IOCTL_UNLINK: 2586 return snd_pcm_unlink(substream); 2587 case SNDRV_PCM_IOCTL_RESUME: 2588 return snd_pcm_resume(substream); 2589 case SNDRV_PCM_IOCTL_XRUN: 2590 return snd_pcm_xrun(substream); 2591 case SNDRV_PCM_IOCTL_HWSYNC: 2592 return snd_pcm_hwsync(substream); 2593 case SNDRV_PCM_IOCTL_DELAY: 2594 return snd_pcm_delay(substream, arg); 2595 case SNDRV_PCM_IOCTL_SYNC_PTR: 2596 return snd_pcm_sync_ptr(substream, arg); 2597 #ifdef CONFIG_SND_SUPPORT_OLD_API 2598 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2599 return snd_pcm_hw_refine_old_user(substream, arg); 2600 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2601 return snd_pcm_hw_params_old_user(substream, arg); 2602 #endif 2603 case SNDRV_PCM_IOCTL_DRAIN: 2604 return snd_pcm_drain(substream, file); 2605 case SNDRV_PCM_IOCTL_DROP: 2606 return snd_pcm_drop(substream); 2607 case SNDRV_PCM_IOCTL_PAUSE: 2608 { 2609 int res; 2610 snd_pcm_stream_lock_irq(substream); 2611 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2612 snd_pcm_stream_unlock_irq(substream); 2613 return res; 2614 } 2615 } 2616 pcm_dbg(substream->pcm, "unknown ioctl = 0x%x\n", cmd); 2617 return -ENOTTY; 2618 } 2619 2620 static int snd_pcm_playback_ioctl1(struct file *file, 2621 struct snd_pcm_substream *substream, 2622 unsigned int cmd, void __user *arg) 2623 { 2624 if (snd_BUG_ON(!substream)) 2625 return -ENXIO; 2626 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2627 return -EINVAL; 2628 switch (cmd) { 2629 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2630 { 2631 struct snd_xferi xferi; 2632 struct snd_xferi __user *_xferi = arg; 2633 struct snd_pcm_runtime *runtime = substream->runtime; 2634 snd_pcm_sframes_t result; 2635 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2636 return -EBADFD; 2637 if (put_user(0, &_xferi->result)) 2638 return -EFAULT; 2639 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2640 return -EFAULT; 2641 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2642 __put_user(result, &_xferi->result); 2643 return result < 0 ? result : 0; 2644 } 2645 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2646 { 2647 struct snd_xfern xfern; 2648 struct snd_xfern __user *_xfern = arg; 2649 struct snd_pcm_runtime *runtime = substream->runtime; 2650 void __user **bufs; 2651 snd_pcm_sframes_t result; 2652 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2653 return -EBADFD; 2654 if (runtime->channels > 128) 2655 return -EINVAL; 2656 if (put_user(0, &_xfern->result)) 2657 return -EFAULT; 2658 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2659 return -EFAULT; 2660 2661 bufs = memdup_user(xfern.bufs, 2662 sizeof(void *) * runtime->channels); 2663 if (IS_ERR(bufs)) 2664 return PTR_ERR(bufs); 2665 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2666 kfree(bufs); 2667 __put_user(result, &_xfern->result); 2668 return result < 0 ? result : 0; 2669 } 2670 case SNDRV_PCM_IOCTL_REWIND: 2671 { 2672 snd_pcm_uframes_t frames; 2673 snd_pcm_uframes_t __user *_frames = arg; 2674 snd_pcm_sframes_t result; 2675 if (get_user(frames, _frames)) 2676 return -EFAULT; 2677 if (put_user(0, _frames)) 2678 return -EFAULT; 2679 result = snd_pcm_playback_rewind(substream, frames); 2680 __put_user(result, _frames); 2681 return result < 0 ? result : 0; 2682 } 2683 case SNDRV_PCM_IOCTL_FORWARD: 2684 { 2685 snd_pcm_uframes_t frames; 2686 snd_pcm_uframes_t __user *_frames = arg; 2687 snd_pcm_sframes_t result; 2688 if (get_user(frames, _frames)) 2689 return -EFAULT; 2690 if (put_user(0, _frames)) 2691 return -EFAULT; 2692 result = snd_pcm_playback_forward(substream, frames); 2693 __put_user(result, _frames); 2694 return result < 0 ? result : 0; 2695 } 2696 } 2697 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2698 } 2699 2700 static int snd_pcm_capture_ioctl1(struct file *file, 2701 struct snd_pcm_substream *substream, 2702 unsigned int cmd, void __user *arg) 2703 { 2704 if (snd_BUG_ON(!substream)) 2705 return -ENXIO; 2706 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2707 return -EINVAL; 2708 switch (cmd) { 2709 case SNDRV_PCM_IOCTL_READI_FRAMES: 2710 { 2711 struct snd_xferi xferi; 2712 struct snd_xferi __user *_xferi = arg; 2713 struct snd_pcm_runtime *runtime = substream->runtime; 2714 snd_pcm_sframes_t result; 2715 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2716 return -EBADFD; 2717 if (put_user(0, &_xferi->result)) 2718 return -EFAULT; 2719 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2720 return -EFAULT; 2721 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2722 __put_user(result, &_xferi->result); 2723 return result < 0 ? result : 0; 2724 } 2725 case SNDRV_PCM_IOCTL_READN_FRAMES: 2726 { 2727 struct snd_xfern xfern; 2728 struct snd_xfern __user *_xfern = arg; 2729 struct snd_pcm_runtime *runtime = substream->runtime; 2730 void *bufs; 2731 snd_pcm_sframes_t result; 2732 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2733 return -EBADFD; 2734 if (runtime->channels > 128) 2735 return -EINVAL; 2736 if (put_user(0, &_xfern->result)) 2737 return -EFAULT; 2738 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2739 return -EFAULT; 2740 2741 bufs = memdup_user(xfern.bufs, 2742 sizeof(void *) * runtime->channels); 2743 if (IS_ERR(bufs)) 2744 return PTR_ERR(bufs); 2745 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2746 kfree(bufs); 2747 __put_user(result, &_xfern->result); 2748 return result < 0 ? result : 0; 2749 } 2750 case SNDRV_PCM_IOCTL_REWIND: 2751 { 2752 snd_pcm_uframes_t frames; 2753 snd_pcm_uframes_t __user *_frames = arg; 2754 snd_pcm_sframes_t result; 2755 if (get_user(frames, _frames)) 2756 return -EFAULT; 2757 if (put_user(0, _frames)) 2758 return -EFAULT; 2759 result = snd_pcm_capture_rewind(substream, frames); 2760 __put_user(result, _frames); 2761 return result < 0 ? result : 0; 2762 } 2763 case SNDRV_PCM_IOCTL_FORWARD: 2764 { 2765 snd_pcm_uframes_t frames; 2766 snd_pcm_uframes_t __user *_frames = arg; 2767 snd_pcm_sframes_t result; 2768 if (get_user(frames, _frames)) 2769 return -EFAULT; 2770 if (put_user(0, _frames)) 2771 return -EFAULT; 2772 result = snd_pcm_capture_forward(substream, frames); 2773 __put_user(result, _frames); 2774 return result < 0 ? result : 0; 2775 } 2776 } 2777 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2778 } 2779 2780 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2781 unsigned long arg) 2782 { 2783 struct snd_pcm_file *pcm_file; 2784 2785 pcm_file = file->private_data; 2786 2787 if (((cmd >> 8) & 0xff) != 'A') 2788 return -ENOTTY; 2789 2790 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2791 (void __user *)arg); 2792 } 2793 2794 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2795 unsigned long arg) 2796 { 2797 struct snd_pcm_file *pcm_file; 2798 2799 pcm_file = file->private_data; 2800 2801 if (((cmd >> 8) & 0xff) != 'A') 2802 return -ENOTTY; 2803 2804 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2805 (void __user *)arg); 2806 } 2807 2808 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2809 unsigned int cmd, void *arg) 2810 { 2811 mm_segment_t fs; 2812 int result; 2813 2814 fs = snd_enter_user(); 2815 switch (substream->stream) { 2816 case SNDRV_PCM_STREAM_PLAYBACK: 2817 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2818 (void __user *)arg); 2819 break; 2820 case SNDRV_PCM_STREAM_CAPTURE: 2821 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2822 (void __user *)arg); 2823 break; 2824 default: 2825 result = -EINVAL; 2826 break; 2827 } 2828 snd_leave_user(fs); 2829 return result; 2830 } 2831 2832 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2833 2834 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2835 loff_t * offset) 2836 { 2837 struct snd_pcm_file *pcm_file; 2838 struct snd_pcm_substream *substream; 2839 struct snd_pcm_runtime *runtime; 2840 snd_pcm_sframes_t result; 2841 2842 pcm_file = file->private_data; 2843 substream = pcm_file->substream; 2844 if (PCM_RUNTIME_CHECK(substream)) 2845 return -ENXIO; 2846 runtime = substream->runtime; 2847 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2848 return -EBADFD; 2849 if (!frame_aligned(runtime, count)) 2850 return -EINVAL; 2851 count = bytes_to_frames(runtime, count); 2852 result = snd_pcm_lib_read(substream, buf, count); 2853 if (result > 0) 2854 result = frames_to_bytes(runtime, result); 2855 return result; 2856 } 2857 2858 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2859 size_t count, loff_t * offset) 2860 { 2861 struct snd_pcm_file *pcm_file; 2862 struct snd_pcm_substream *substream; 2863 struct snd_pcm_runtime *runtime; 2864 snd_pcm_sframes_t result; 2865 2866 pcm_file = file->private_data; 2867 substream = pcm_file->substream; 2868 if (PCM_RUNTIME_CHECK(substream)) 2869 return -ENXIO; 2870 runtime = substream->runtime; 2871 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2872 return -EBADFD; 2873 if (!frame_aligned(runtime, count)) 2874 return -EINVAL; 2875 count = bytes_to_frames(runtime, count); 2876 result = snd_pcm_lib_write(substream, buf, count); 2877 if (result > 0) 2878 result = frames_to_bytes(runtime, result); 2879 return result; 2880 } 2881 2882 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 2883 unsigned long nr_segs, loff_t pos) 2884 2885 { 2886 struct snd_pcm_file *pcm_file; 2887 struct snd_pcm_substream *substream; 2888 struct snd_pcm_runtime *runtime; 2889 snd_pcm_sframes_t result; 2890 unsigned long i; 2891 void __user **bufs; 2892 snd_pcm_uframes_t frames; 2893 2894 pcm_file = iocb->ki_filp->private_data; 2895 substream = pcm_file->substream; 2896 if (PCM_RUNTIME_CHECK(substream)) 2897 return -ENXIO; 2898 runtime = substream->runtime; 2899 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2900 return -EBADFD; 2901 if (nr_segs > 1024 || nr_segs != runtime->channels) 2902 return -EINVAL; 2903 if (!frame_aligned(runtime, iov->iov_len)) 2904 return -EINVAL; 2905 frames = bytes_to_samples(runtime, iov->iov_len); 2906 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2907 if (bufs == NULL) 2908 return -ENOMEM; 2909 for (i = 0; i < nr_segs; ++i) 2910 bufs[i] = iov[i].iov_base; 2911 result = snd_pcm_lib_readv(substream, bufs, frames); 2912 if (result > 0) 2913 result = frames_to_bytes(runtime, result); 2914 kfree(bufs); 2915 return result; 2916 } 2917 2918 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 2919 unsigned long nr_segs, loff_t pos) 2920 { 2921 struct snd_pcm_file *pcm_file; 2922 struct snd_pcm_substream *substream; 2923 struct snd_pcm_runtime *runtime; 2924 snd_pcm_sframes_t result; 2925 unsigned long i; 2926 void __user **bufs; 2927 snd_pcm_uframes_t frames; 2928 2929 pcm_file = iocb->ki_filp->private_data; 2930 substream = pcm_file->substream; 2931 if (PCM_RUNTIME_CHECK(substream)) 2932 return -ENXIO; 2933 runtime = substream->runtime; 2934 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2935 return -EBADFD; 2936 if (nr_segs > 128 || nr_segs != runtime->channels || 2937 !frame_aligned(runtime, iov->iov_len)) 2938 return -EINVAL; 2939 frames = bytes_to_samples(runtime, iov->iov_len); 2940 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2941 if (bufs == NULL) 2942 return -ENOMEM; 2943 for (i = 0; i < nr_segs; ++i) 2944 bufs[i] = iov[i].iov_base; 2945 result = snd_pcm_lib_writev(substream, bufs, frames); 2946 if (result > 0) 2947 result = frames_to_bytes(runtime, result); 2948 kfree(bufs); 2949 return result; 2950 } 2951 2952 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 2953 { 2954 struct snd_pcm_file *pcm_file; 2955 struct snd_pcm_substream *substream; 2956 struct snd_pcm_runtime *runtime; 2957 unsigned int mask; 2958 snd_pcm_uframes_t avail; 2959 2960 pcm_file = file->private_data; 2961 2962 substream = pcm_file->substream; 2963 if (PCM_RUNTIME_CHECK(substream)) 2964 return -ENXIO; 2965 runtime = substream->runtime; 2966 2967 poll_wait(file, &runtime->sleep, wait); 2968 2969 snd_pcm_stream_lock_irq(substream); 2970 avail = snd_pcm_playback_avail(runtime); 2971 switch (runtime->status->state) { 2972 case SNDRV_PCM_STATE_RUNNING: 2973 case SNDRV_PCM_STATE_PREPARED: 2974 case SNDRV_PCM_STATE_PAUSED: 2975 if (avail >= runtime->control->avail_min) { 2976 mask = POLLOUT | POLLWRNORM; 2977 break; 2978 } 2979 /* Fall through */ 2980 case SNDRV_PCM_STATE_DRAINING: 2981 mask = 0; 2982 break; 2983 default: 2984 mask = POLLOUT | POLLWRNORM | POLLERR; 2985 break; 2986 } 2987 snd_pcm_stream_unlock_irq(substream); 2988 return mask; 2989 } 2990 2991 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 2992 { 2993 struct snd_pcm_file *pcm_file; 2994 struct snd_pcm_substream *substream; 2995 struct snd_pcm_runtime *runtime; 2996 unsigned int mask; 2997 snd_pcm_uframes_t avail; 2998 2999 pcm_file = file->private_data; 3000 3001 substream = pcm_file->substream; 3002 if (PCM_RUNTIME_CHECK(substream)) 3003 return -ENXIO; 3004 runtime = substream->runtime; 3005 3006 poll_wait(file, &runtime->sleep, wait); 3007 3008 snd_pcm_stream_lock_irq(substream); 3009 avail = snd_pcm_capture_avail(runtime); 3010 switch (runtime->status->state) { 3011 case SNDRV_PCM_STATE_RUNNING: 3012 case SNDRV_PCM_STATE_PREPARED: 3013 case SNDRV_PCM_STATE_PAUSED: 3014 if (avail >= runtime->control->avail_min) { 3015 mask = POLLIN | POLLRDNORM; 3016 break; 3017 } 3018 mask = 0; 3019 break; 3020 case SNDRV_PCM_STATE_DRAINING: 3021 if (avail > 0) { 3022 mask = POLLIN | POLLRDNORM; 3023 break; 3024 } 3025 /* Fall through */ 3026 default: 3027 mask = POLLIN | POLLRDNORM | POLLERR; 3028 break; 3029 } 3030 snd_pcm_stream_unlock_irq(substream); 3031 return mask; 3032 } 3033 3034 /* 3035 * mmap support 3036 */ 3037 3038 /* 3039 * Only on coherent architectures, we can mmap the status and the control records 3040 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3041 */ 3042 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3043 /* 3044 * mmap status record 3045 */ 3046 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 3047 struct vm_fault *vmf) 3048 { 3049 struct snd_pcm_substream *substream = area->vm_private_data; 3050 struct snd_pcm_runtime *runtime; 3051 3052 if (substream == NULL) 3053 return VM_FAULT_SIGBUS; 3054 runtime = substream->runtime; 3055 vmf->page = virt_to_page(runtime->status); 3056 get_page(vmf->page); 3057 return 0; 3058 } 3059 3060 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3061 { 3062 .fault = snd_pcm_mmap_status_fault, 3063 }; 3064 3065 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3066 struct vm_area_struct *area) 3067 { 3068 long size; 3069 if (!(area->vm_flags & VM_READ)) 3070 return -EINVAL; 3071 size = area->vm_end - area->vm_start; 3072 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3073 return -EINVAL; 3074 area->vm_ops = &snd_pcm_vm_ops_status; 3075 area->vm_private_data = substream; 3076 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3077 return 0; 3078 } 3079 3080 /* 3081 * mmap control record 3082 */ 3083 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3084 struct vm_fault *vmf) 3085 { 3086 struct snd_pcm_substream *substream = area->vm_private_data; 3087 struct snd_pcm_runtime *runtime; 3088 3089 if (substream == NULL) 3090 return VM_FAULT_SIGBUS; 3091 runtime = substream->runtime; 3092 vmf->page = virt_to_page(runtime->control); 3093 get_page(vmf->page); 3094 return 0; 3095 } 3096 3097 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3098 { 3099 .fault = snd_pcm_mmap_control_fault, 3100 }; 3101 3102 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3103 struct vm_area_struct *area) 3104 { 3105 long size; 3106 if (!(area->vm_flags & VM_READ)) 3107 return -EINVAL; 3108 size = area->vm_end - area->vm_start; 3109 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3110 return -EINVAL; 3111 area->vm_ops = &snd_pcm_vm_ops_control; 3112 area->vm_private_data = substream; 3113 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3114 return 0; 3115 } 3116 #else /* ! coherent mmap */ 3117 /* 3118 * don't support mmap for status and control records. 3119 */ 3120 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3121 struct vm_area_struct *area) 3122 { 3123 return -ENXIO; 3124 } 3125 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3126 struct vm_area_struct *area) 3127 { 3128 return -ENXIO; 3129 } 3130 #endif /* coherent mmap */ 3131 3132 static inline struct page * 3133 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3134 { 3135 void *vaddr = substream->runtime->dma_area + ofs; 3136 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3137 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3138 return virt_to_page(CAC_ADDR(vaddr)); 3139 #endif 3140 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE) 3141 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) { 3142 dma_addr_t addr = substream->runtime->dma_addr + ofs; 3143 addr -= get_dma_offset(substream->dma_buffer.dev.dev); 3144 /* assume dma_handle set via pfn_to_phys() in 3145 * mm/dma-noncoherent.c 3146 */ 3147 return pfn_to_page(addr >> PAGE_SHIFT); 3148 } 3149 #endif 3150 return virt_to_page(vaddr); 3151 } 3152 3153 /* 3154 * fault callback for mmapping a RAM page 3155 */ 3156 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3157 struct vm_fault *vmf) 3158 { 3159 struct snd_pcm_substream *substream = area->vm_private_data; 3160 struct snd_pcm_runtime *runtime; 3161 unsigned long offset; 3162 struct page * page; 3163 size_t dma_bytes; 3164 3165 if (substream == NULL) 3166 return VM_FAULT_SIGBUS; 3167 runtime = substream->runtime; 3168 offset = vmf->pgoff << PAGE_SHIFT; 3169 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3170 if (offset > dma_bytes - PAGE_SIZE) 3171 return VM_FAULT_SIGBUS; 3172 if (substream->ops->page) 3173 page = substream->ops->page(substream, offset); 3174 else 3175 page = snd_pcm_default_page_ops(substream, offset); 3176 if (!page) 3177 return VM_FAULT_SIGBUS; 3178 get_page(page); 3179 vmf->page = page; 3180 return 0; 3181 } 3182 3183 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3184 .open = snd_pcm_mmap_data_open, 3185 .close = snd_pcm_mmap_data_close, 3186 }; 3187 3188 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3189 .open = snd_pcm_mmap_data_open, 3190 .close = snd_pcm_mmap_data_close, 3191 .fault = snd_pcm_mmap_data_fault, 3192 }; 3193 3194 #ifndef ARCH_HAS_DMA_MMAP_COHERENT 3195 /* This should be defined / handled globally! */ 3196 #ifdef CONFIG_ARM 3197 #define ARCH_HAS_DMA_MMAP_COHERENT 3198 #endif 3199 #endif 3200 3201 /* 3202 * mmap the DMA buffer on RAM 3203 */ 3204 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3205 struct vm_area_struct *area) 3206 { 3207 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3208 #ifdef CONFIG_GENERIC_ALLOCATOR 3209 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV_IRAM) { 3210 area->vm_page_prot = pgprot_writecombine(area->vm_page_prot); 3211 return remap_pfn_range(area, area->vm_start, 3212 substream->dma_buffer.addr >> PAGE_SHIFT, 3213 area->vm_end - area->vm_start, area->vm_page_prot); 3214 } 3215 #endif /* CONFIG_GENERIC_ALLOCATOR */ 3216 #ifdef ARCH_HAS_DMA_MMAP_COHERENT 3217 if (!substream->ops->page && 3218 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3219 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3220 area, 3221 substream->runtime->dma_area, 3222 substream->runtime->dma_addr, 3223 area->vm_end - area->vm_start); 3224 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3225 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV && 3226 !plat_device_is_coherent(substream->dma_buffer.dev.dev)) 3227 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3228 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */ 3229 /* mmap with fault handler */ 3230 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3231 return 0; 3232 } 3233 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3234 3235 /* 3236 * mmap the DMA buffer on I/O memory area 3237 */ 3238 #if SNDRV_PCM_INFO_MMAP_IOMEM 3239 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3240 struct vm_area_struct *area) 3241 { 3242 struct snd_pcm_runtime *runtime = substream->runtime;; 3243 3244 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3245 return vm_iomap_memory(area, runtime->dma_addr, runtime->dma_bytes); 3246 } 3247 3248 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3249 #endif /* SNDRV_PCM_INFO_MMAP */ 3250 3251 /* 3252 * mmap DMA buffer 3253 */ 3254 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3255 struct vm_area_struct *area) 3256 { 3257 struct snd_pcm_runtime *runtime; 3258 long size; 3259 unsigned long offset; 3260 size_t dma_bytes; 3261 int err; 3262 3263 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3264 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3265 return -EINVAL; 3266 } else { 3267 if (!(area->vm_flags & VM_READ)) 3268 return -EINVAL; 3269 } 3270 runtime = substream->runtime; 3271 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3272 return -EBADFD; 3273 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3274 return -ENXIO; 3275 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3276 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3277 return -EINVAL; 3278 size = area->vm_end - area->vm_start; 3279 offset = area->vm_pgoff << PAGE_SHIFT; 3280 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3281 if ((size_t)size > dma_bytes) 3282 return -EINVAL; 3283 if (offset > dma_bytes - size) 3284 return -EINVAL; 3285 3286 area->vm_ops = &snd_pcm_vm_ops_data; 3287 area->vm_private_data = substream; 3288 if (substream->ops->mmap) 3289 err = substream->ops->mmap(substream, area); 3290 else 3291 err = snd_pcm_lib_default_mmap(substream, area); 3292 if (!err) 3293 atomic_inc(&substream->mmap_count); 3294 return err; 3295 } 3296 3297 EXPORT_SYMBOL(snd_pcm_mmap_data); 3298 3299 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3300 { 3301 struct snd_pcm_file * pcm_file; 3302 struct snd_pcm_substream *substream; 3303 unsigned long offset; 3304 3305 pcm_file = file->private_data; 3306 substream = pcm_file->substream; 3307 if (PCM_RUNTIME_CHECK(substream)) 3308 return -ENXIO; 3309 3310 offset = area->vm_pgoff << PAGE_SHIFT; 3311 switch (offset) { 3312 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3313 if (pcm_file->no_compat_mmap) 3314 return -ENXIO; 3315 return snd_pcm_mmap_status(substream, file, area); 3316 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3317 if (pcm_file->no_compat_mmap) 3318 return -ENXIO; 3319 return snd_pcm_mmap_control(substream, file, area); 3320 default: 3321 return snd_pcm_mmap_data(substream, file, area); 3322 } 3323 return 0; 3324 } 3325 3326 static int snd_pcm_fasync(int fd, struct file * file, int on) 3327 { 3328 struct snd_pcm_file * pcm_file; 3329 struct snd_pcm_substream *substream; 3330 struct snd_pcm_runtime *runtime; 3331 3332 pcm_file = file->private_data; 3333 substream = pcm_file->substream; 3334 if (PCM_RUNTIME_CHECK(substream)) 3335 return -ENXIO; 3336 runtime = substream->runtime; 3337 return fasync_helper(fd, file, on, &runtime->fasync); 3338 } 3339 3340 /* 3341 * ioctl32 compat 3342 */ 3343 #ifdef CONFIG_COMPAT 3344 #include "pcm_compat.c" 3345 #else 3346 #define snd_pcm_ioctl_compat NULL 3347 #endif 3348 3349 /* 3350 * To be removed helpers to keep binary compatibility 3351 */ 3352 3353 #ifdef CONFIG_SND_SUPPORT_OLD_API 3354 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3355 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3356 3357 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3358 struct snd_pcm_hw_params_old *oparams) 3359 { 3360 unsigned int i; 3361 3362 memset(params, 0, sizeof(*params)); 3363 params->flags = oparams->flags; 3364 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3365 params->masks[i].bits[0] = oparams->masks[i]; 3366 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3367 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3368 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3369 params->info = oparams->info; 3370 params->msbits = oparams->msbits; 3371 params->rate_num = oparams->rate_num; 3372 params->rate_den = oparams->rate_den; 3373 params->fifo_size = oparams->fifo_size; 3374 } 3375 3376 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3377 struct snd_pcm_hw_params *params) 3378 { 3379 unsigned int i; 3380 3381 memset(oparams, 0, sizeof(*oparams)); 3382 oparams->flags = params->flags; 3383 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3384 oparams->masks[i] = params->masks[i].bits[0]; 3385 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3386 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3387 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3388 oparams->info = params->info; 3389 oparams->msbits = params->msbits; 3390 oparams->rate_num = params->rate_num; 3391 oparams->rate_den = params->rate_den; 3392 oparams->fifo_size = params->fifo_size; 3393 } 3394 3395 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3396 struct snd_pcm_hw_params_old __user * _oparams) 3397 { 3398 struct snd_pcm_hw_params *params; 3399 struct snd_pcm_hw_params_old *oparams = NULL; 3400 int err; 3401 3402 params = kmalloc(sizeof(*params), GFP_KERNEL); 3403 if (!params) 3404 return -ENOMEM; 3405 3406 oparams = memdup_user(_oparams, sizeof(*oparams)); 3407 if (IS_ERR(oparams)) { 3408 err = PTR_ERR(oparams); 3409 goto out; 3410 } 3411 snd_pcm_hw_convert_from_old_params(params, oparams); 3412 err = snd_pcm_hw_refine(substream, params); 3413 snd_pcm_hw_convert_to_old_params(oparams, params); 3414 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3415 if (!err) 3416 err = -EFAULT; 3417 } 3418 3419 kfree(oparams); 3420 out: 3421 kfree(params); 3422 return err; 3423 } 3424 3425 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3426 struct snd_pcm_hw_params_old __user * _oparams) 3427 { 3428 struct snd_pcm_hw_params *params; 3429 struct snd_pcm_hw_params_old *oparams = NULL; 3430 int err; 3431 3432 params = kmalloc(sizeof(*params), GFP_KERNEL); 3433 if (!params) 3434 return -ENOMEM; 3435 3436 oparams = memdup_user(_oparams, sizeof(*oparams)); 3437 if (IS_ERR(oparams)) { 3438 err = PTR_ERR(oparams); 3439 goto out; 3440 } 3441 snd_pcm_hw_convert_from_old_params(params, oparams); 3442 err = snd_pcm_hw_params(substream, params); 3443 snd_pcm_hw_convert_to_old_params(oparams, params); 3444 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3445 if (!err) 3446 err = -EFAULT; 3447 } 3448 3449 kfree(oparams); 3450 out: 3451 kfree(params); 3452 return err; 3453 } 3454 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3455 3456 #ifndef CONFIG_MMU 3457 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3458 unsigned long addr, 3459 unsigned long len, 3460 unsigned long pgoff, 3461 unsigned long flags) 3462 { 3463 struct snd_pcm_file *pcm_file = file->private_data; 3464 struct snd_pcm_substream *substream = pcm_file->substream; 3465 struct snd_pcm_runtime *runtime = substream->runtime; 3466 unsigned long offset = pgoff << PAGE_SHIFT; 3467 3468 switch (offset) { 3469 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3470 return (unsigned long)runtime->status; 3471 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3472 return (unsigned long)runtime->control; 3473 default: 3474 return (unsigned long)runtime->dma_area + offset; 3475 } 3476 } 3477 #else 3478 # define snd_pcm_get_unmapped_area NULL 3479 #endif 3480 3481 /* 3482 * Register section 3483 */ 3484 3485 const struct file_operations snd_pcm_f_ops[2] = { 3486 { 3487 .owner = THIS_MODULE, 3488 .write = snd_pcm_write, 3489 .aio_write = snd_pcm_aio_write, 3490 .open = snd_pcm_playback_open, 3491 .release = snd_pcm_release, 3492 .llseek = no_llseek, 3493 .poll = snd_pcm_playback_poll, 3494 .unlocked_ioctl = snd_pcm_playback_ioctl, 3495 .compat_ioctl = snd_pcm_ioctl_compat, 3496 .mmap = snd_pcm_mmap, 3497 .fasync = snd_pcm_fasync, 3498 .get_unmapped_area = snd_pcm_get_unmapped_area, 3499 }, 3500 { 3501 .owner = THIS_MODULE, 3502 .read = snd_pcm_read, 3503 .aio_read = snd_pcm_aio_read, 3504 .open = snd_pcm_capture_open, 3505 .release = snd_pcm_release, 3506 .llseek = no_llseek, 3507 .poll = snd_pcm_capture_poll, 3508 .unlocked_ioctl = snd_pcm_capture_ioctl, 3509 .compat_ioctl = snd_pcm_ioctl_compat, 3510 .mmap = snd_pcm_mmap, 3511 .fasync = snd_pcm_fasync, 3512 .get_unmapped_area = snd_pcm_get_unmapped_area, 3513 } 3514 }; 3515