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