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->status->state = state; 852 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 853 runtime->silence_size > 0) 854 snd_pcm_playback_silence(substream, ULONG_MAX); 855 if (substream->timer) 856 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, 857 &runtime->trigger_tstamp); 858 } 859 860 static struct action_ops snd_pcm_action_start = { 861 .pre_action = snd_pcm_pre_start, 862 .do_action = snd_pcm_do_start, 863 .undo_action = snd_pcm_undo_start, 864 .post_action = snd_pcm_post_start 865 }; 866 867 /** 868 * snd_pcm_start - start all linked streams 869 * @substream: the PCM substream instance 870 */ 871 int snd_pcm_start(struct snd_pcm_substream *substream) 872 { 873 return snd_pcm_action(&snd_pcm_action_start, substream, 874 SNDRV_PCM_STATE_RUNNING); 875 } 876 877 /* 878 * stop callbacks 879 */ 880 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 881 { 882 struct snd_pcm_runtime *runtime = substream->runtime; 883 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 884 return -EBADFD; 885 runtime->trigger_master = substream; 886 return 0; 887 } 888 889 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 890 { 891 if (substream->runtime->trigger_master == substream && 892 snd_pcm_running(substream)) 893 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 894 return 0; /* unconditonally stop all substreams */ 895 } 896 897 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 898 { 899 struct snd_pcm_runtime *runtime = substream->runtime; 900 if (runtime->status->state != state) { 901 snd_pcm_trigger_tstamp(substream); 902 if (substream->timer) 903 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 904 &runtime->trigger_tstamp); 905 runtime->status->state = state; 906 } 907 wake_up(&runtime->sleep); 908 } 909 910 static struct action_ops snd_pcm_action_stop = { 911 .pre_action = snd_pcm_pre_stop, 912 .do_action = snd_pcm_do_stop, 913 .post_action = snd_pcm_post_stop 914 }; 915 916 /** 917 * snd_pcm_stop - try to stop all running streams in the substream group 918 * @substream: the PCM substream instance 919 * @state: PCM state after stopping the stream 920 * 921 * The state of each stream is then changed to the given state unconditionally. 922 */ 923 int snd_pcm_stop(struct snd_pcm_substream *substream, int state) 924 { 925 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 926 } 927 928 EXPORT_SYMBOL(snd_pcm_stop); 929 930 /** 931 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 932 * @substream: the PCM substream 933 * 934 * After stopping, the state is changed to SETUP. 935 * Unlike snd_pcm_stop(), this affects only the given stream. 936 */ 937 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 938 { 939 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 940 SNDRV_PCM_STATE_SETUP); 941 } 942 943 /* 944 * pause callbacks 945 */ 946 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 947 { 948 struct snd_pcm_runtime *runtime = substream->runtime; 949 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 950 return -ENOSYS; 951 if (push) { 952 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 953 return -EBADFD; 954 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 955 return -EBADFD; 956 runtime->trigger_master = substream; 957 return 0; 958 } 959 960 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 961 { 962 if (substream->runtime->trigger_master != substream) 963 return 0; 964 return substream->ops->trigger(substream, 965 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 966 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 967 } 968 969 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 970 { 971 if (substream->runtime->trigger_master == substream) 972 substream->ops->trigger(substream, 973 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 974 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 975 } 976 977 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 978 { 979 struct snd_pcm_runtime *runtime = substream->runtime; 980 snd_pcm_trigger_tstamp(substream); 981 if (push) { 982 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 983 if (substream->timer) 984 snd_timer_notify(substream->timer, 985 SNDRV_TIMER_EVENT_MPAUSE, 986 &runtime->trigger_tstamp); 987 wake_up(&runtime->sleep); 988 } else { 989 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 990 if (substream->timer) 991 snd_timer_notify(substream->timer, 992 SNDRV_TIMER_EVENT_MCONTINUE, 993 &runtime->trigger_tstamp); 994 } 995 } 996 997 static struct action_ops snd_pcm_action_pause = { 998 .pre_action = snd_pcm_pre_pause, 999 .do_action = snd_pcm_do_pause, 1000 .undo_action = snd_pcm_undo_pause, 1001 .post_action = snd_pcm_post_pause 1002 }; 1003 1004 /* 1005 * Push/release the pause for all linked streams. 1006 */ 1007 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1008 { 1009 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1010 } 1011 1012 #ifdef CONFIG_PM 1013 /* suspend */ 1014 1015 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1016 { 1017 struct snd_pcm_runtime *runtime = substream->runtime; 1018 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1019 return -EBUSY; 1020 runtime->trigger_master = substream; 1021 return 0; 1022 } 1023 1024 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1025 { 1026 struct snd_pcm_runtime *runtime = substream->runtime; 1027 if (runtime->trigger_master != substream) 1028 return 0; 1029 if (! snd_pcm_running(substream)) 1030 return 0; 1031 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1032 return 0; /* suspend unconditionally */ 1033 } 1034 1035 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1036 { 1037 struct snd_pcm_runtime *runtime = substream->runtime; 1038 snd_pcm_trigger_tstamp(substream); 1039 if (substream->timer) 1040 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1041 &runtime->trigger_tstamp); 1042 runtime->status->suspended_state = runtime->status->state; 1043 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1044 wake_up(&runtime->sleep); 1045 } 1046 1047 static struct action_ops snd_pcm_action_suspend = { 1048 .pre_action = snd_pcm_pre_suspend, 1049 .do_action = snd_pcm_do_suspend, 1050 .post_action = snd_pcm_post_suspend 1051 }; 1052 1053 /** 1054 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1055 * @substream: the PCM substream 1056 * 1057 * After this call, all streams are changed to SUSPENDED state. 1058 */ 1059 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1060 { 1061 int err; 1062 unsigned long flags; 1063 1064 if (! substream) 1065 return 0; 1066 1067 snd_pcm_stream_lock_irqsave(substream, flags); 1068 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1069 snd_pcm_stream_unlock_irqrestore(substream, flags); 1070 return err; 1071 } 1072 1073 EXPORT_SYMBOL(snd_pcm_suspend); 1074 1075 /** 1076 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1077 * @pcm: the PCM instance 1078 * 1079 * After this call, all streams are changed to SUSPENDED state. 1080 */ 1081 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1082 { 1083 struct snd_pcm_substream *substream; 1084 int stream, err = 0; 1085 1086 if (! pcm) 1087 return 0; 1088 1089 for (stream = 0; stream < 2; stream++) { 1090 for (substream = pcm->streams[stream].substream; 1091 substream; substream = substream->next) { 1092 /* FIXME: the open/close code should lock this as well */ 1093 if (substream->runtime == NULL) 1094 continue; 1095 err = snd_pcm_suspend(substream); 1096 if (err < 0 && err != -EBUSY) 1097 return err; 1098 } 1099 } 1100 return 0; 1101 } 1102 1103 EXPORT_SYMBOL(snd_pcm_suspend_all); 1104 1105 /* resume */ 1106 1107 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1108 { 1109 struct snd_pcm_runtime *runtime = substream->runtime; 1110 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1111 return -ENOSYS; 1112 runtime->trigger_master = substream; 1113 return 0; 1114 } 1115 1116 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1117 { 1118 struct snd_pcm_runtime *runtime = substream->runtime; 1119 if (runtime->trigger_master != substream) 1120 return 0; 1121 /* DMA not running previously? */ 1122 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1123 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1124 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1125 return 0; 1126 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1127 } 1128 1129 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1130 { 1131 if (substream->runtime->trigger_master == substream && 1132 snd_pcm_running(substream)) 1133 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1134 } 1135 1136 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1137 { 1138 struct snd_pcm_runtime *runtime = substream->runtime; 1139 snd_pcm_trigger_tstamp(substream); 1140 if (substream->timer) 1141 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1142 &runtime->trigger_tstamp); 1143 runtime->status->state = runtime->status->suspended_state; 1144 } 1145 1146 static struct action_ops snd_pcm_action_resume = { 1147 .pre_action = snd_pcm_pre_resume, 1148 .do_action = snd_pcm_do_resume, 1149 .undo_action = snd_pcm_undo_resume, 1150 .post_action = snd_pcm_post_resume 1151 }; 1152 1153 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1154 { 1155 struct snd_card *card = substream->pcm->card; 1156 int res; 1157 1158 snd_power_lock(card); 1159 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1160 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1161 snd_power_unlock(card); 1162 return res; 1163 } 1164 1165 #else 1166 1167 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1168 { 1169 return -ENOSYS; 1170 } 1171 1172 #endif /* CONFIG_PM */ 1173 1174 /* 1175 * xrun ioctl 1176 * 1177 * Change the RUNNING stream(s) to XRUN state. 1178 */ 1179 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1180 { 1181 struct snd_card *card = substream->pcm->card; 1182 struct snd_pcm_runtime *runtime = substream->runtime; 1183 int result; 1184 1185 snd_power_lock(card); 1186 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1187 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1188 if (result < 0) 1189 goto _unlock; 1190 } 1191 1192 snd_pcm_stream_lock_irq(substream); 1193 switch (runtime->status->state) { 1194 case SNDRV_PCM_STATE_XRUN: 1195 result = 0; /* already there */ 1196 break; 1197 case SNDRV_PCM_STATE_RUNNING: 1198 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1199 break; 1200 default: 1201 result = -EBADFD; 1202 } 1203 snd_pcm_stream_unlock_irq(substream); 1204 _unlock: 1205 snd_power_unlock(card); 1206 return result; 1207 } 1208 1209 /* 1210 * reset ioctl 1211 */ 1212 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1213 { 1214 struct snd_pcm_runtime *runtime = substream->runtime; 1215 switch (runtime->status->state) { 1216 case SNDRV_PCM_STATE_RUNNING: 1217 case SNDRV_PCM_STATE_PREPARED: 1218 case SNDRV_PCM_STATE_PAUSED: 1219 case SNDRV_PCM_STATE_SUSPENDED: 1220 return 0; 1221 default: 1222 return -EBADFD; 1223 } 1224 } 1225 1226 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1227 { 1228 struct snd_pcm_runtime *runtime = substream->runtime; 1229 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1230 if (err < 0) 1231 return err; 1232 runtime->hw_ptr_base = 0; 1233 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1234 runtime->status->hw_ptr % runtime->period_size; 1235 runtime->silence_start = runtime->status->hw_ptr; 1236 runtime->silence_filled = 0; 1237 return 0; 1238 } 1239 1240 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1241 { 1242 struct snd_pcm_runtime *runtime = substream->runtime; 1243 runtime->control->appl_ptr = runtime->status->hw_ptr; 1244 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1245 runtime->silence_size > 0) 1246 snd_pcm_playback_silence(substream, ULONG_MAX); 1247 } 1248 1249 static struct action_ops snd_pcm_action_reset = { 1250 .pre_action = snd_pcm_pre_reset, 1251 .do_action = snd_pcm_do_reset, 1252 .post_action = snd_pcm_post_reset 1253 }; 1254 1255 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1256 { 1257 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1258 } 1259 1260 /* 1261 * prepare ioctl 1262 */ 1263 /* we use the second argument for updating f_flags */ 1264 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1265 int f_flags) 1266 { 1267 struct snd_pcm_runtime *runtime = substream->runtime; 1268 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1269 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1270 return -EBADFD; 1271 if (snd_pcm_running(substream)) 1272 return -EBUSY; 1273 substream->f_flags = f_flags; 1274 return 0; 1275 } 1276 1277 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1278 { 1279 int err; 1280 err = substream->ops->prepare(substream); 1281 if (err < 0) 1282 return err; 1283 return snd_pcm_do_reset(substream, 0); 1284 } 1285 1286 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1287 { 1288 struct snd_pcm_runtime *runtime = substream->runtime; 1289 runtime->control->appl_ptr = runtime->status->hw_ptr; 1290 runtime->status->state = SNDRV_PCM_STATE_PREPARED; 1291 } 1292 1293 static struct action_ops snd_pcm_action_prepare = { 1294 .pre_action = snd_pcm_pre_prepare, 1295 .do_action = snd_pcm_do_prepare, 1296 .post_action = snd_pcm_post_prepare 1297 }; 1298 1299 /** 1300 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1301 * @substream: the PCM substream instance 1302 * @file: file to refer f_flags 1303 */ 1304 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1305 struct file *file) 1306 { 1307 int res; 1308 struct snd_card *card = substream->pcm->card; 1309 int f_flags; 1310 1311 if (file) 1312 f_flags = file->f_flags; 1313 else 1314 f_flags = substream->f_flags; 1315 1316 snd_power_lock(card); 1317 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1318 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1319 substream, f_flags); 1320 snd_power_unlock(card); 1321 return res; 1322 } 1323 1324 /* 1325 * drain ioctl 1326 */ 1327 1328 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1329 { 1330 if (substream->f_flags & O_NONBLOCK) 1331 return -EAGAIN; 1332 substream->runtime->trigger_master = substream; 1333 return 0; 1334 } 1335 1336 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1337 { 1338 struct snd_pcm_runtime *runtime = substream->runtime; 1339 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1340 switch (runtime->status->state) { 1341 case SNDRV_PCM_STATE_PREPARED: 1342 /* start playback stream if possible */ 1343 if (! snd_pcm_playback_empty(substream)) { 1344 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1345 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1346 } 1347 break; 1348 case SNDRV_PCM_STATE_RUNNING: 1349 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1350 break; 1351 default: 1352 break; 1353 } 1354 } else { 1355 /* stop running stream */ 1356 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1357 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1358 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1359 snd_pcm_do_stop(substream, new_state); 1360 snd_pcm_post_stop(substream, new_state); 1361 } 1362 } 1363 return 0; 1364 } 1365 1366 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1367 { 1368 } 1369 1370 static struct action_ops snd_pcm_action_drain_init = { 1371 .pre_action = snd_pcm_pre_drain_init, 1372 .do_action = snd_pcm_do_drain_init, 1373 .post_action = snd_pcm_post_drain_init 1374 }; 1375 1376 struct drain_rec { 1377 struct snd_pcm_substream *substream; 1378 wait_queue_t wait; 1379 snd_pcm_uframes_t stop_threshold; 1380 }; 1381 1382 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1383 1384 /* 1385 * Drain the stream(s). 1386 * When the substream is linked, sync until the draining of all playback streams 1387 * is finished. 1388 * After this call, all streams are supposed to be either SETUP or DRAINING 1389 * (capture only) state. 1390 */ 1391 static int snd_pcm_drain(struct snd_pcm_substream *substream) 1392 { 1393 struct snd_card *card; 1394 struct snd_pcm_runtime *runtime; 1395 struct snd_pcm_substream *s; 1396 int result = 0; 1397 int i, num_drecs; 1398 struct drain_rec *drec, drec_tmp, *d; 1399 1400 card = substream->pcm->card; 1401 runtime = substream->runtime; 1402 1403 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1404 return -EBADFD; 1405 1406 snd_power_lock(card); 1407 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1408 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1409 if (result < 0) { 1410 snd_power_unlock(card); 1411 return result; 1412 } 1413 } 1414 1415 /* allocate temporary record for drain sync */ 1416 down_read(&snd_pcm_link_rwsem); 1417 if (snd_pcm_stream_linked(substream)) { 1418 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL); 1419 if (! drec) { 1420 up_read(&snd_pcm_link_rwsem); 1421 snd_power_unlock(card); 1422 return -ENOMEM; 1423 } 1424 } else 1425 drec = &drec_tmp; 1426 1427 /* count only playback streams */ 1428 num_drecs = 0; 1429 snd_pcm_group_for_each_entry(s, substream) { 1430 runtime = s->runtime; 1431 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1432 d = &drec[num_drecs++]; 1433 d->substream = s; 1434 init_waitqueue_entry(&d->wait, current); 1435 add_wait_queue(&runtime->sleep, &d->wait); 1436 /* stop_threshold fixup to avoid endless loop when 1437 * stop_threshold > buffer_size 1438 */ 1439 d->stop_threshold = runtime->stop_threshold; 1440 if (runtime->stop_threshold > runtime->buffer_size) 1441 runtime->stop_threshold = runtime->buffer_size; 1442 } 1443 } 1444 up_read(&snd_pcm_link_rwsem); 1445 1446 snd_pcm_stream_lock_irq(substream); 1447 /* resume pause */ 1448 if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1449 snd_pcm_pause(substream, 0); 1450 1451 /* pre-start/stop - all running streams are changed to DRAINING state */ 1452 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1453 if (result < 0) { 1454 snd_pcm_stream_unlock_irq(substream); 1455 goto _error; 1456 } 1457 1458 for (;;) { 1459 long tout; 1460 if (signal_pending(current)) { 1461 result = -ERESTARTSYS; 1462 break; 1463 } 1464 /* all finished? */ 1465 for (i = 0; i < num_drecs; i++) { 1466 runtime = drec[i].substream->runtime; 1467 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) 1468 break; 1469 } 1470 if (i == num_drecs) 1471 break; /* yes, all drained */ 1472 1473 set_current_state(TASK_INTERRUPTIBLE); 1474 snd_pcm_stream_unlock_irq(substream); 1475 snd_power_unlock(card); 1476 tout = schedule_timeout(10 * HZ); 1477 snd_power_lock(card); 1478 snd_pcm_stream_lock_irq(substream); 1479 if (tout == 0) { 1480 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1481 result = -ESTRPIPE; 1482 else { 1483 snd_printd("playback drain error (DMA or IRQ trouble?)\n"); 1484 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1485 result = -EIO; 1486 } 1487 break; 1488 } 1489 } 1490 1491 snd_pcm_stream_unlock_irq(substream); 1492 1493 _error: 1494 for (i = 0; i < num_drecs; i++) { 1495 d = &drec[i]; 1496 runtime = d->substream->runtime; 1497 remove_wait_queue(&runtime->sleep, &d->wait); 1498 runtime->stop_threshold = d->stop_threshold; 1499 } 1500 1501 if (drec != &drec_tmp) 1502 kfree(drec); 1503 snd_power_unlock(card); 1504 1505 return result; 1506 } 1507 1508 /* 1509 * drop ioctl 1510 * 1511 * Immediately put all linked substreams into SETUP state. 1512 */ 1513 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1514 { 1515 struct snd_pcm_runtime *runtime; 1516 struct snd_card *card; 1517 int result = 0; 1518 1519 if (PCM_RUNTIME_CHECK(substream)) 1520 return -ENXIO; 1521 runtime = substream->runtime; 1522 card = substream->pcm->card; 1523 1524 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1525 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1526 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1527 return -EBADFD; 1528 1529 snd_pcm_stream_lock_irq(substream); 1530 /* resume pause */ 1531 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1532 snd_pcm_pause(substream, 0); 1533 1534 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1535 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1536 snd_pcm_stream_unlock_irq(substream); 1537 1538 return result; 1539 } 1540 1541 1542 /* WARNING: Don't forget to fput back the file */ 1543 static struct file *snd_pcm_file_fd(int fd) 1544 { 1545 struct file *file; 1546 struct inode *inode; 1547 unsigned int minor; 1548 1549 file = fget(fd); 1550 if (!file) 1551 return NULL; 1552 inode = file->f_path.dentry->d_inode; 1553 if (!S_ISCHR(inode->i_mode) || 1554 imajor(inode) != snd_major) { 1555 fput(file); 1556 return NULL; 1557 } 1558 minor = iminor(inode); 1559 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) && 1560 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) { 1561 fput(file); 1562 return NULL; 1563 } 1564 return file; 1565 } 1566 1567 /* 1568 * PCM link handling 1569 */ 1570 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1571 { 1572 int res = 0; 1573 struct file *file; 1574 struct snd_pcm_file *pcm_file; 1575 struct snd_pcm_substream *substream1; 1576 1577 file = snd_pcm_file_fd(fd); 1578 if (!file) 1579 return -EBADFD; 1580 pcm_file = file->private_data; 1581 substream1 = pcm_file->substream; 1582 down_write(&snd_pcm_link_rwsem); 1583 write_lock_irq(&snd_pcm_link_rwlock); 1584 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1585 substream->runtime->status->state != substream1->runtime->status->state) { 1586 res = -EBADFD; 1587 goto _end; 1588 } 1589 if (snd_pcm_stream_linked(substream1)) { 1590 res = -EALREADY; 1591 goto _end; 1592 } 1593 if (!snd_pcm_stream_linked(substream)) { 1594 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC); 1595 if (substream->group == NULL) { 1596 res = -ENOMEM; 1597 goto _end; 1598 } 1599 spin_lock_init(&substream->group->lock); 1600 INIT_LIST_HEAD(&substream->group->substreams); 1601 list_add_tail(&substream->link_list, &substream->group->substreams); 1602 substream->group->count = 1; 1603 } 1604 list_add_tail(&substream1->link_list, &substream->group->substreams); 1605 substream->group->count++; 1606 substream1->group = substream->group; 1607 _end: 1608 write_unlock_irq(&snd_pcm_link_rwlock); 1609 up_write(&snd_pcm_link_rwsem); 1610 fput(file); 1611 return res; 1612 } 1613 1614 static void relink_to_local(struct snd_pcm_substream *substream) 1615 { 1616 substream->group = &substream->self_group; 1617 INIT_LIST_HEAD(&substream->self_group.substreams); 1618 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1619 } 1620 1621 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1622 { 1623 struct snd_pcm_substream *s; 1624 int res = 0; 1625 1626 down_write(&snd_pcm_link_rwsem); 1627 write_lock_irq(&snd_pcm_link_rwlock); 1628 if (!snd_pcm_stream_linked(substream)) { 1629 res = -EALREADY; 1630 goto _end; 1631 } 1632 list_del(&substream->link_list); 1633 substream->group->count--; 1634 if (substream->group->count == 1) { /* detach the last stream, too */ 1635 snd_pcm_group_for_each_entry(s, substream) { 1636 relink_to_local(s); 1637 break; 1638 } 1639 kfree(substream->group); 1640 } 1641 relink_to_local(substream); 1642 _end: 1643 write_unlock_irq(&snd_pcm_link_rwlock); 1644 up_write(&snd_pcm_link_rwsem); 1645 return res; 1646 } 1647 1648 /* 1649 * hw configurator 1650 */ 1651 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1652 struct snd_pcm_hw_rule *rule) 1653 { 1654 struct snd_interval t; 1655 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1656 hw_param_interval_c(params, rule->deps[1]), &t); 1657 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1658 } 1659 1660 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1661 struct snd_pcm_hw_rule *rule) 1662 { 1663 struct snd_interval t; 1664 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1665 hw_param_interval_c(params, rule->deps[1]), &t); 1666 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1667 } 1668 1669 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1670 struct snd_pcm_hw_rule *rule) 1671 { 1672 struct snd_interval t; 1673 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1674 hw_param_interval_c(params, rule->deps[1]), 1675 (unsigned long) rule->private, &t); 1676 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1677 } 1678 1679 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1680 struct snd_pcm_hw_rule *rule) 1681 { 1682 struct snd_interval t; 1683 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1684 (unsigned long) rule->private, 1685 hw_param_interval_c(params, rule->deps[1]), &t); 1686 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1687 } 1688 1689 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1690 struct snd_pcm_hw_rule *rule) 1691 { 1692 unsigned int k; 1693 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1694 struct snd_mask m; 1695 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1696 snd_mask_any(&m); 1697 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1698 int bits; 1699 if (! snd_mask_test(mask, k)) 1700 continue; 1701 bits = snd_pcm_format_physical_width(k); 1702 if (bits <= 0) 1703 continue; /* ignore invalid formats */ 1704 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1705 snd_mask_reset(&m, k); 1706 } 1707 return snd_mask_refine(mask, &m); 1708 } 1709 1710 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1711 struct snd_pcm_hw_rule *rule) 1712 { 1713 struct snd_interval t; 1714 unsigned int k; 1715 t.min = UINT_MAX; 1716 t.max = 0; 1717 t.openmin = 0; 1718 t.openmax = 0; 1719 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1720 int bits; 1721 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1722 continue; 1723 bits = snd_pcm_format_physical_width(k); 1724 if (bits <= 0) 1725 continue; /* ignore invalid formats */ 1726 if (t.min > (unsigned)bits) 1727 t.min = bits; 1728 if (t.max < (unsigned)bits) 1729 t.max = bits; 1730 } 1731 t.integer = 1; 1732 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1733 } 1734 1735 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1736 #error "Change this table" 1737 #endif 1738 1739 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1740 48000, 64000, 88200, 96000, 176400, 192000 }; 1741 1742 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1743 .count = ARRAY_SIZE(rates), 1744 .list = rates, 1745 }; 1746 1747 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1748 struct snd_pcm_hw_rule *rule) 1749 { 1750 struct snd_pcm_hardware *hw = rule->private; 1751 return snd_interval_list(hw_param_interval(params, rule->var), 1752 snd_pcm_known_rates.count, 1753 snd_pcm_known_rates.list, hw->rates); 1754 } 1755 1756 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1757 struct snd_pcm_hw_rule *rule) 1758 { 1759 struct snd_interval t; 1760 struct snd_pcm_substream *substream = rule->private; 1761 t.min = 0; 1762 t.max = substream->buffer_bytes_max; 1763 t.openmin = 0; 1764 t.openmax = 0; 1765 t.integer = 1; 1766 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1767 } 1768 1769 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1770 { 1771 struct snd_pcm_runtime *runtime = substream->runtime; 1772 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1773 int k, err; 1774 1775 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1776 snd_mask_any(constrs_mask(constrs, k)); 1777 } 1778 1779 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1780 snd_interval_any(constrs_interval(constrs, k)); 1781 } 1782 1783 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1784 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1785 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1786 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1787 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1788 1789 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1790 snd_pcm_hw_rule_format, NULL, 1791 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1792 if (err < 0) 1793 return err; 1794 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1795 snd_pcm_hw_rule_sample_bits, NULL, 1796 SNDRV_PCM_HW_PARAM_FORMAT, 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_div, NULL, 1802 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1803 if (err < 0) 1804 return err; 1805 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1806 snd_pcm_hw_rule_mul, NULL, 1807 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1808 if (err < 0) 1809 return err; 1810 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1811 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1812 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1813 if (err < 0) 1814 return err; 1815 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1816 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1817 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 1818 if (err < 0) 1819 return err; 1820 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1821 snd_pcm_hw_rule_div, NULL, 1822 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1823 if (err < 0) 1824 return err; 1825 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1826 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1827 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 1828 if (err < 0) 1829 return err; 1830 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1831 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1832 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 1833 if (err < 0) 1834 return err; 1835 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 1836 snd_pcm_hw_rule_div, NULL, 1837 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1838 if (err < 0) 1839 return err; 1840 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1841 snd_pcm_hw_rule_div, NULL, 1842 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1843 if (err < 0) 1844 return err; 1845 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1846 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1847 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1848 if (err < 0) 1849 return err; 1850 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1851 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1852 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1853 if (err < 0) 1854 return err; 1855 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1856 snd_pcm_hw_rule_mul, NULL, 1857 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1858 if (err < 0) 1859 return err; 1860 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1861 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1862 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1863 if (err < 0) 1864 return err; 1865 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1866 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1867 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1868 if (err < 0) 1869 return err; 1870 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1871 snd_pcm_hw_rule_muldivk, (void*) 8, 1872 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1873 if (err < 0) 1874 return err; 1875 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1876 snd_pcm_hw_rule_muldivk, (void*) 8, 1877 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1878 if (err < 0) 1879 return err; 1880 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1881 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1882 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1883 if (err < 0) 1884 return err; 1885 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 1886 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1887 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1888 if (err < 0) 1889 return err; 1890 return 0; 1891 } 1892 1893 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 1894 { 1895 struct snd_pcm_runtime *runtime = substream->runtime; 1896 struct snd_pcm_hardware *hw = &runtime->hw; 1897 int err; 1898 unsigned int mask = 0; 1899 1900 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1901 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 1902 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1903 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 1904 if (hw->info & SNDRV_PCM_INFO_MMAP) { 1905 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1906 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 1907 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1908 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 1909 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 1910 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 1911 } 1912 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 1913 if (err < 0) 1914 return err; 1915 1916 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 1917 if (err < 0) 1918 return err; 1919 1920 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 1921 if (err < 0) 1922 return err; 1923 1924 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 1925 hw->channels_min, hw->channels_max); 1926 if (err < 0) 1927 return err; 1928 1929 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 1930 hw->rate_min, hw->rate_max); 1931 if (err < 0) 1932 return err; 1933 1934 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1935 hw->period_bytes_min, hw->period_bytes_max); 1936 if (err < 0) 1937 return err; 1938 1939 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 1940 hw->periods_min, hw->periods_max); 1941 if (err < 0) 1942 return err; 1943 1944 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1945 hw->period_bytes_min, hw->buffer_bytes_max); 1946 if (err < 0) 1947 return err; 1948 1949 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1950 snd_pcm_hw_rule_buffer_bytes_max, substream, 1951 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 1952 if (err < 0) 1953 return err; 1954 1955 /* FIXME: remove */ 1956 if (runtime->dma_bytes) { 1957 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 1958 if (err < 0) 1959 return -EINVAL; 1960 } 1961 1962 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 1963 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1964 snd_pcm_hw_rule_rate, hw, 1965 SNDRV_PCM_HW_PARAM_RATE, -1); 1966 if (err < 0) 1967 return err; 1968 } 1969 1970 /* FIXME: this belong to lowlevel */ 1971 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 1972 1973 return 0; 1974 } 1975 1976 static void pcm_release_private(struct snd_pcm_substream *substream) 1977 { 1978 snd_pcm_unlink(substream); 1979 } 1980 1981 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 1982 { 1983 substream->ref_count--; 1984 if (substream->ref_count > 0) 1985 return; 1986 1987 snd_pcm_drop(substream); 1988 if (substream->hw_opened) { 1989 if (substream->ops->hw_free != NULL) 1990 substream->ops->hw_free(substream); 1991 substream->ops->close(substream); 1992 substream->hw_opened = 0; 1993 } 1994 if (substream->pcm_release) { 1995 substream->pcm_release(substream); 1996 substream->pcm_release = NULL; 1997 } 1998 snd_pcm_detach_substream(substream); 1999 } 2000 2001 EXPORT_SYMBOL(snd_pcm_release_substream); 2002 2003 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2004 struct file *file, 2005 struct snd_pcm_substream **rsubstream) 2006 { 2007 struct snd_pcm_substream *substream; 2008 int err; 2009 2010 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2011 if (err < 0) 2012 return err; 2013 if (substream->ref_count > 1) { 2014 *rsubstream = substream; 2015 return 0; 2016 } 2017 2018 err = snd_pcm_hw_constraints_init(substream); 2019 if (err < 0) { 2020 snd_printd("snd_pcm_hw_constraints_init failed\n"); 2021 goto error; 2022 } 2023 2024 if ((err = substream->ops->open(substream)) < 0) 2025 goto error; 2026 2027 substream->hw_opened = 1; 2028 2029 err = snd_pcm_hw_constraints_complete(substream); 2030 if (err < 0) { 2031 snd_printd("snd_pcm_hw_constraints_complete failed\n"); 2032 goto error; 2033 } 2034 2035 *rsubstream = substream; 2036 return 0; 2037 2038 error: 2039 snd_pcm_release_substream(substream); 2040 return err; 2041 } 2042 2043 EXPORT_SYMBOL(snd_pcm_open_substream); 2044 2045 static int snd_pcm_open_file(struct file *file, 2046 struct snd_pcm *pcm, 2047 int stream, 2048 struct snd_pcm_file **rpcm_file) 2049 { 2050 struct snd_pcm_file *pcm_file; 2051 struct snd_pcm_substream *substream; 2052 struct snd_pcm_str *str; 2053 int err; 2054 2055 if (rpcm_file) 2056 *rpcm_file = NULL; 2057 2058 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2059 if (err < 0) 2060 return err; 2061 2062 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2063 if (pcm_file == NULL) { 2064 snd_pcm_release_substream(substream); 2065 return -ENOMEM; 2066 } 2067 pcm_file->substream = substream; 2068 if (substream->ref_count == 1) { 2069 str = substream->pstr; 2070 substream->file = pcm_file; 2071 substream->pcm_release = pcm_release_private; 2072 } 2073 file->private_data = pcm_file; 2074 if (rpcm_file) 2075 *rpcm_file = pcm_file; 2076 return 0; 2077 } 2078 2079 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2080 { 2081 struct snd_pcm *pcm; 2082 2083 pcm = snd_lookup_minor_data(iminor(inode), 2084 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2085 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2086 } 2087 2088 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2089 { 2090 struct snd_pcm *pcm; 2091 2092 pcm = snd_lookup_minor_data(iminor(inode), 2093 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2094 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2095 } 2096 2097 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2098 { 2099 int err; 2100 struct snd_pcm_file *pcm_file; 2101 wait_queue_t wait; 2102 2103 if (pcm == NULL) { 2104 err = -ENODEV; 2105 goto __error1; 2106 } 2107 err = snd_card_file_add(pcm->card, file); 2108 if (err < 0) 2109 goto __error1; 2110 if (!try_module_get(pcm->card->module)) { 2111 err = -EFAULT; 2112 goto __error2; 2113 } 2114 init_waitqueue_entry(&wait, current); 2115 add_wait_queue(&pcm->open_wait, &wait); 2116 mutex_lock(&pcm->open_mutex); 2117 while (1) { 2118 err = snd_pcm_open_file(file, pcm, stream, &pcm_file); 2119 if (err >= 0) 2120 break; 2121 if (err == -EAGAIN) { 2122 if (file->f_flags & O_NONBLOCK) { 2123 err = -EBUSY; 2124 break; 2125 } 2126 } else 2127 break; 2128 set_current_state(TASK_INTERRUPTIBLE); 2129 mutex_unlock(&pcm->open_mutex); 2130 schedule(); 2131 mutex_lock(&pcm->open_mutex); 2132 if (signal_pending(current)) { 2133 err = -ERESTARTSYS; 2134 break; 2135 } 2136 } 2137 remove_wait_queue(&pcm->open_wait, &wait); 2138 mutex_unlock(&pcm->open_mutex); 2139 if (err < 0) 2140 goto __error; 2141 return err; 2142 2143 __error: 2144 module_put(pcm->card->module); 2145 __error2: 2146 snd_card_file_remove(pcm->card, file); 2147 __error1: 2148 return err; 2149 } 2150 2151 static int snd_pcm_release(struct inode *inode, struct file *file) 2152 { 2153 struct snd_pcm *pcm; 2154 struct snd_pcm_substream *substream; 2155 struct snd_pcm_file *pcm_file; 2156 2157 pcm_file = file->private_data; 2158 substream = pcm_file->substream; 2159 if (snd_BUG_ON(!substream)) 2160 return -ENXIO; 2161 pcm = substream->pcm; 2162 mutex_lock(&pcm->open_mutex); 2163 snd_pcm_release_substream(substream); 2164 kfree(pcm_file); 2165 mutex_unlock(&pcm->open_mutex); 2166 wake_up(&pcm->open_wait); 2167 module_put(pcm->card->module); 2168 snd_card_file_remove(pcm->card, file); 2169 return 0; 2170 } 2171 2172 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2173 snd_pcm_uframes_t frames) 2174 { 2175 struct snd_pcm_runtime *runtime = substream->runtime; 2176 snd_pcm_sframes_t appl_ptr; 2177 snd_pcm_sframes_t ret; 2178 snd_pcm_sframes_t hw_avail; 2179 2180 if (frames == 0) 2181 return 0; 2182 2183 snd_pcm_stream_lock_irq(substream); 2184 switch (runtime->status->state) { 2185 case SNDRV_PCM_STATE_PREPARED: 2186 break; 2187 case SNDRV_PCM_STATE_DRAINING: 2188 case SNDRV_PCM_STATE_RUNNING: 2189 if (snd_pcm_update_hw_ptr(substream) >= 0) 2190 break; 2191 /* Fall through */ 2192 case SNDRV_PCM_STATE_XRUN: 2193 ret = -EPIPE; 2194 goto __end; 2195 default: 2196 ret = -EBADFD; 2197 goto __end; 2198 } 2199 2200 hw_avail = snd_pcm_playback_hw_avail(runtime); 2201 if (hw_avail <= 0) { 2202 ret = 0; 2203 goto __end; 2204 } 2205 if (frames > (snd_pcm_uframes_t)hw_avail) 2206 frames = hw_avail; 2207 appl_ptr = runtime->control->appl_ptr - frames; 2208 if (appl_ptr < 0) 2209 appl_ptr += runtime->boundary; 2210 runtime->control->appl_ptr = appl_ptr; 2211 ret = frames; 2212 __end: 2213 snd_pcm_stream_unlock_irq(substream); 2214 return ret; 2215 } 2216 2217 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2218 snd_pcm_uframes_t frames) 2219 { 2220 struct snd_pcm_runtime *runtime = substream->runtime; 2221 snd_pcm_sframes_t appl_ptr; 2222 snd_pcm_sframes_t ret; 2223 snd_pcm_sframes_t hw_avail; 2224 2225 if (frames == 0) 2226 return 0; 2227 2228 snd_pcm_stream_lock_irq(substream); 2229 switch (runtime->status->state) { 2230 case SNDRV_PCM_STATE_PREPARED: 2231 case SNDRV_PCM_STATE_DRAINING: 2232 break; 2233 case SNDRV_PCM_STATE_RUNNING: 2234 if (snd_pcm_update_hw_ptr(substream) >= 0) 2235 break; 2236 /* Fall through */ 2237 case SNDRV_PCM_STATE_XRUN: 2238 ret = -EPIPE; 2239 goto __end; 2240 default: 2241 ret = -EBADFD; 2242 goto __end; 2243 } 2244 2245 hw_avail = snd_pcm_capture_hw_avail(runtime); 2246 if (hw_avail <= 0) { 2247 ret = 0; 2248 goto __end; 2249 } 2250 if (frames > (snd_pcm_uframes_t)hw_avail) 2251 frames = hw_avail; 2252 appl_ptr = runtime->control->appl_ptr - frames; 2253 if (appl_ptr < 0) 2254 appl_ptr += runtime->boundary; 2255 runtime->control->appl_ptr = appl_ptr; 2256 ret = frames; 2257 __end: 2258 snd_pcm_stream_unlock_irq(substream); 2259 return ret; 2260 } 2261 2262 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2263 snd_pcm_uframes_t frames) 2264 { 2265 struct snd_pcm_runtime *runtime = substream->runtime; 2266 snd_pcm_sframes_t appl_ptr; 2267 snd_pcm_sframes_t ret; 2268 snd_pcm_sframes_t avail; 2269 2270 if (frames == 0) 2271 return 0; 2272 2273 snd_pcm_stream_lock_irq(substream); 2274 switch (runtime->status->state) { 2275 case SNDRV_PCM_STATE_PREPARED: 2276 case SNDRV_PCM_STATE_PAUSED: 2277 break; 2278 case SNDRV_PCM_STATE_DRAINING: 2279 case SNDRV_PCM_STATE_RUNNING: 2280 if (snd_pcm_update_hw_ptr(substream) >= 0) 2281 break; 2282 /* Fall through */ 2283 case SNDRV_PCM_STATE_XRUN: 2284 ret = -EPIPE; 2285 goto __end; 2286 default: 2287 ret = -EBADFD; 2288 goto __end; 2289 } 2290 2291 avail = snd_pcm_playback_avail(runtime); 2292 if (avail <= 0) { 2293 ret = 0; 2294 goto __end; 2295 } 2296 if (frames > (snd_pcm_uframes_t)avail) 2297 frames = avail; 2298 appl_ptr = runtime->control->appl_ptr + frames; 2299 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2300 appl_ptr -= runtime->boundary; 2301 runtime->control->appl_ptr = appl_ptr; 2302 ret = frames; 2303 __end: 2304 snd_pcm_stream_unlock_irq(substream); 2305 return ret; 2306 } 2307 2308 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2309 snd_pcm_uframes_t frames) 2310 { 2311 struct snd_pcm_runtime *runtime = substream->runtime; 2312 snd_pcm_sframes_t appl_ptr; 2313 snd_pcm_sframes_t ret; 2314 snd_pcm_sframes_t avail; 2315 2316 if (frames == 0) 2317 return 0; 2318 2319 snd_pcm_stream_lock_irq(substream); 2320 switch (runtime->status->state) { 2321 case SNDRV_PCM_STATE_PREPARED: 2322 case SNDRV_PCM_STATE_DRAINING: 2323 case SNDRV_PCM_STATE_PAUSED: 2324 break; 2325 case SNDRV_PCM_STATE_RUNNING: 2326 if (snd_pcm_update_hw_ptr(substream) >= 0) 2327 break; 2328 /* Fall through */ 2329 case SNDRV_PCM_STATE_XRUN: 2330 ret = -EPIPE; 2331 goto __end; 2332 default: 2333 ret = -EBADFD; 2334 goto __end; 2335 } 2336 2337 avail = snd_pcm_capture_avail(runtime); 2338 if (avail <= 0) { 2339 ret = 0; 2340 goto __end; 2341 } 2342 if (frames > (snd_pcm_uframes_t)avail) 2343 frames = avail; 2344 appl_ptr = runtime->control->appl_ptr + frames; 2345 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2346 appl_ptr -= runtime->boundary; 2347 runtime->control->appl_ptr = appl_ptr; 2348 ret = frames; 2349 __end: 2350 snd_pcm_stream_unlock_irq(substream); 2351 return ret; 2352 } 2353 2354 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2355 { 2356 struct snd_pcm_runtime *runtime = substream->runtime; 2357 int err; 2358 2359 snd_pcm_stream_lock_irq(substream); 2360 switch (runtime->status->state) { 2361 case SNDRV_PCM_STATE_DRAINING: 2362 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2363 goto __badfd; 2364 case SNDRV_PCM_STATE_RUNNING: 2365 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2366 break; 2367 /* Fall through */ 2368 case SNDRV_PCM_STATE_PREPARED: 2369 case SNDRV_PCM_STATE_SUSPENDED: 2370 err = 0; 2371 break; 2372 case SNDRV_PCM_STATE_XRUN: 2373 err = -EPIPE; 2374 break; 2375 default: 2376 __badfd: 2377 err = -EBADFD; 2378 break; 2379 } 2380 snd_pcm_stream_unlock_irq(substream); 2381 return err; 2382 } 2383 2384 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2385 snd_pcm_sframes_t __user *res) 2386 { 2387 struct snd_pcm_runtime *runtime = substream->runtime; 2388 int err; 2389 snd_pcm_sframes_t n = 0; 2390 2391 snd_pcm_stream_lock_irq(substream); 2392 switch (runtime->status->state) { 2393 case SNDRV_PCM_STATE_DRAINING: 2394 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2395 goto __badfd; 2396 case SNDRV_PCM_STATE_RUNNING: 2397 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2398 break; 2399 /* Fall through */ 2400 case SNDRV_PCM_STATE_PREPARED: 2401 case SNDRV_PCM_STATE_SUSPENDED: 2402 err = 0; 2403 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2404 n = snd_pcm_playback_hw_avail(runtime); 2405 else 2406 n = snd_pcm_capture_avail(runtime); 2407 break; 2408 case SNDRV_PCM_STATE_XRUN: 2409 err = -EPIPE; 2410 break; 2411 default: 2412 __badfd: 2413 err = -EBADFD; 2414 break; 2415 } 2416 snd_pcm_stream_unlock_irq(substream); 2417 if (!err) 2418 if (put_user(n, res)) 2419 err = -EFAULT; 2420 return err; 2421 } 2422 2423 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2424 struct snd_pcm_sync_ptr __user *_sync_ptr) 2425 { 2426 struct snd_pcm_runtime *runtime = substream->runtime; 2427 struct snd_pcm_sync_ptr sync_ptr; 2428 volatile struct snd_pcm_mmap_status *status; 2429 volatile struct snd_pcm_mmap_control *control; 2430 int err; 2431 2432 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2433 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2434 return -EFAULT; 2435 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2436 return -EFAULT; 2437 status = runtime->status; 2438 control = runtime->control; 2439 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2440 err = snd_pcm_hwsync(substream); 2441 if (err < 0) 2442 return err; 2443 } 2444 snd_pcm_stream_lock_irq(substream); 2445 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2446 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2447 else 2448 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2449 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2450 control->avail_min = sync_ptr.c.control.avail_min; 2451 else 2452 sync_ptr.c.control.avail_min = control->avail_min; 2453 sync_ptr.s.status.state = status->state; 2454 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2455 sync_ptr.s.status.tstamp = status->tstamp; 2456 sync_ptr.s.status.suspended_state = status->suspended_state; 2457 snd_pcm_stream_unlock_irq(substream); 2458 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2459 return -EFAULT; 2460 return 0; 2461 } 2462 2463 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2464 { 2465 struct snd_pcm_runtime *runtime = substream->runtime; 2466 int arg; 2467 2468 if (get_user(arg, _arg)) 2469 return -EFAULT; 2470 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2471 return -EINVAL; 2472 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY; 2473 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 2474 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC; 2475 return 0; 2476 } 2477 2478 static int snd_pcm_common_ioctl1(struct file *file, 2479 struct snd_pcm_substream *substream, 2480 unsigned int cmd, void __user *arg) 2481 { 2482 switch (cmd) { 2483 case SNDRV_PCM_IOCTL_PVERSION: 2484 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2485 case SNDRV_PCM_IOCTL_INFO: 2486 return snd_pcm_info_user(substream, arg); 2487 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2488 return 0; 2489 case SNDRV_PCM_IOCTL_TTSTAMP: 2490 return snd_pcm_tstamp(substream, arg); 2491 case SNDRV_PCM_IOCTL_HW_REFINE: 2492 return snd_pcm_hw_refine_user(substream, arg); 2493 case SNDRV_PCM_IOCTL_HW_PARAMS: 2494 return snd_pcm_hw_params_user(substream, arg); 2495 case SNDRV_PCM_IOCTL_HW_FREE: 2496 return snd_pcm_hw_free(substream); 2497 case SNDRV_PCM_IOCTL_SW_PARAMS: 2498 return snd_pcm_sw_params_user(substream, arg); 2499 case SNDRV_PCM_IOCTL_STATUS: 2500 return snd_pcm_status_user(substream, arg); 2501 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2502 return snd_pcm_channel_info_user(substream, arg); 2503 case SNDRV_PCM_IOCTL_PREPARE: 2504 return snd_pcm_prepare(substream, file); 2505 case SNDRV_PCM_IOCTL_RESET: 2506 return snd_pcm_reset(substream); 2507 case SNDRV_PCM_IOCTL_START: 2508 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2509 case SNDRV_PCM_IOCTL_LINK: 2510 return snd_pcm_link(substream, (int)(unsigned long) arg); 2511 case SNDRV_PCM_IOCTL_UNLINK: 2512 return snd_pcm_unlink(substream); 2513 case SNDRV_PCM_IOCTL_RESUME: 2514 return snd_pcm_resume(substream); 2515 case SNDRV_PCM_IOCTL_XRUN: 2516 return snd_pcm_xrun(substream); 2517 case SNDRV_PCM_IOCTL_HWSYNC: 2518 return snd_pcm_hwsync(substream); 2519 case SNDRV_PCM_IOCTL_DELAY: 2520 return snd_pcm_delay(substream, arg); 2521 case SNDRV_PCM_IOCTL_SYNC_PTR: 2522 return snd_pcm_sync_ptr(substream, arg); 2523 #ifdef CONFIG_SND_SUPPORT_OLD_API 2524 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2525 return snd_pcm_hw_refine_old_user(substream, arg); 2526 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2527 return snd_pcm_hw_params_old_user(substream, arg); 2528 #endif 2529 case SNDRV_PCM_IOCTL_DRAIN: 2530 return snd_pcm_drain(substream); 2531 case SNDRV_PCM_IOCTL_DROP: 2532 return snd_pcm_drop(substream); 2533 case SNDRV_PCM_IOCTL_PAUSE: 2534 { 2535 int res; 2536 snd_pcm_stream_lock_irq(substream); 2537 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2538 snd_pcm_stream_unlock_irq(substream); 2539 return res; 2540 } 2541 } 2542 snd_printd("unknown ioctl = 0x%x\n", cmd); 2543 return -ENOTTY; 2544 } 2545 2546 static int snd_pcm_playback_ioctl1(struct file *file, 2547 struct snd_pcm_substream *substream, 2548 unsigned int cmd, void __user *arg) 2549 { 2550 if (snd_BUG_ON(!substream)) 2551 return -ENXIO; 2552 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2553 return -EINVAL; 2554 switch (cmd) { 2555 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2556 { 2557 struct snd_xferi xferi; 2558 struct snd_xferi __user *_xferi = arg; 2559 struct snd_pcm_runtime *runtime = substream->runtime; 2560 snd_pcm_sframes_t result; 2561 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2562 return -EBADFD; 2563 if (put_user(0, &_xferi->result)) 2564 return -EFAULT; 2565 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2566 return -EFAULT; 2567 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2568 __put_user(result, &_xferi->result); 2569 return result < 0 ? result : 0; 2570 } 2571 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2572 { 2573 struct snd_xfern xfern; 2574 struct snd_xfern __user *_xfern = arg; 2575 struct snd_pcm_runtime *runtime = substream->runtime; 2576 void __user **bufs; 2577 snd_pcm_sframes_t result; 2578 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2579 return -EBADFD; 2580 if (runtime->channels > 128) 2581 return -EINVAL; 2582 if (put_user(0, &_xfern->result)) 2583 return -EFAULT; 2584 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2585 return -EFAULT; 2586 2587 bufs = memdup_user(xfern.bufs, 2588 sizeof(void *) * runtime->channels); 2589 if (IS_ERR(bufs)) 2590 return PTR_ERR(bufs); 2591 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2592 kfree(bufs); 2593 __put_user(result, &_xfern->result); 2594 return result < 0 ? result : 0; 2595 } 2596 case SNDRV_PCM_IOCTL_REWIND: 2597 { 2598 snd_pcm_uframes_t frames; 2599 snd_pcm_uframes_t __user *_frames = arg; 2600 snd_pcm_sframes_t result; 2601 if (get_user(frames, _frames)) 2602 return -EFAULT; 2603 if (put_user(0, _frames)) 2604 return -EFAULT; 2605 result = snd_pcm_playback_rewind(substream, frames); 2606 __put_user(result, _frames); 2607 return result < 0 ? result : 0; 2608 } 2609 case SNDRV_PCM_IOCTL_FORWARD: 2610 { 2611 snd_pcm_uframes_t frames; 2612 snd_pcm_uframes_t __user *_frames = arg; 2613 snd_pcm_sframes_t result; 2614 if (get_user(frames, _frames)) 2615 return -EFAULT; 2616 if (put_user(0, _frames)) 2617 return -EFAULT; 2618 result = snd_pcm_playback_forward(substream, frames); 2619 __put_user(result, _frames); 2620 return result < 0 ? result : 0; 2621 } 2622 } 2623 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2624 } 2625 2626 static int snd_pcm_capture_ioctl1(struct file *file, 2627 struct snd_pcm_substream *substream, 2628 unsigned int cmd, void __user *arg) 2629 { 2630 if (snd_BUG_ON(!substream)) 2631 return -ENXIO; 2632 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2633 return -EINVAL; 2634 switch (cmd) { 2635 case SNDRV_PCM_IOCTL_READI_FRAMES: 2636 { 2637 struct snd_xferi xferi; 2638 struct snd_xferi __user *_xferi = arg; 2639 struct snd_pcm_runtime *runtime = substream->runtime; 2640 snd_pcm_sframes_t result; 2641 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2642 return -EBADFD; 2643 if (put_user(0, &_xferi->result)) 2644 return -EFAULT; 2645 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2646 return -EFAULT; 2647 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2648 __put_user(result, &_xferi->result); 2649 return result < 0 ? result : 0; 2650 } 2651 case SNDRV_PCM_IOCTL_READN_FRAMES: 2652 { 2653 struct snd_xfern xfern; 2654 struct snd_xfern __user *_xfern = arg; 2655 struct snd_pcm_runtime *runtime = substream->runtime; 2656 void *bufs; 2657 snd_pcm_sframes_t result; 2658 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2659 return -EBADFD; 2660 if (runtime->channels > 128) 2661 return -EINVAL; 2662 if (put_user(0, &_xfern->result)) 2663 return -EFAULT; 2664 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2665 return -EFAULT; 2666 2667 bufs = memdup_user(xfern.bufs, 2668 sizeof(void *) * runtime->channels); 2669 if (IS_ERR(bufs)) 2670 return PTR_ERR(bufs); 2671 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2672 kfree(bufs); 2673 __put_user(result, &_xfern->result); 2674 return result < 0 ? result : 0; 2675 } 2676 case SNDRV_PCM_IOCTL_REWIND: 2677 { 2678 snd_pcm_uframes_t frames; 2679 snd_pcm_uframes_t __user *_frames = arg; 2680 snd_pcm_sframes_t result; 2681 if (get_user(frames, _frames)) 2682 return -EFAULT; 2683 if (put_user(0, _frames)) 2684 return -EFAULT; 2685 result = snd_pcm_capture_rewind(substream, frames); 2686 __put_user(result, _frames); 2687 return result < 0 ? result : 0; 2688 } 2689 case SNDRV_PCM_IOCTL_FORWARD: 2690 { 2691 snd_pcm_uframes_t frames; 2692 snd_pcm_uframes_t __user *_frames = arg; 2693 snd_pcm_sframes_t result; 2694 if (get_user(frames, _frames)) 2695 return -EFAULT; 2696 if (put_user(0, _frames)) 2697 return -EFAULT; 2698 result = snd_pcm_capture_forward(substream, frames); 2699 __put_user(result, _frames); 2700 return result < 0 ? result : 0; 2701 } 2702 } 2703 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2704 } 2705 2706 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2707 unsigned long arg) 2708 { 2709 struct snd_pcm_file *pcm_file; 2710 2711 pcm_file = file->private_data; 2712 2713 if (((cmd >> 8) & 0xff) != 'A') 2714 return -ENOTTY; 2715 2716 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2717 (void __user *)arg); 2718 } 2719 2720 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2721 unsigned long arg) 2722 { 2723 struct snd_pcm_file *pcm_file; 2724 2725 pcm_file = file->private_data; 2726 2727 if (((cmd >> 8) & 0xff) != 'A') 2728 return -ENOTTY; 2729 2730 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2731 (void __user *)arg); 2732 } 2733 2734 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2735 unsigned int cmd, void *arg) 2736 { 2737 mm_segment_t fs; 2738 int result; 2739 2740 fs = snd_enter_user(); 2741 switch (substream->stream) { 2742 case SNDRV_PCM_STREAM_PLAYBACK: 2743 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2744 (void __user *)arg); 2745 break; 2746 case SNDRV_PCM_STREAM_CAPTURE: 2747 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2748 (void __user *)arg); 2749 break; 2750 default: 2751 result = -EINVAL; 2752 break; 2753 } 2754 snd_leave_user(fs); 2755 return result; 2756 } 2757 2758 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2759 2760 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2761 loff_t * offset) 2762 { 2763 struct snd_pcm_file *pcm_file; 2764 struct snd_pcm_substream *substream; 2765 struct snd_pcm_runtime *runtime; 2766 snd_pcm_sframes_t result; 2767 2768 pcm_file = file->private_data; 2769 substream = pcm_file->substream; 2770 if (PCM_RUNTIME_CHECK(substream)) 2771 return -ENXIO; 2772 runtime = substream->runtime; 2773 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2774 return -EBADFD; 2775 if (!frame_aligned(runtime, count)) 2776 return -EINVAL; 2777 count = bytes_to_frames(runtime, count); 2778 result = snd_pcm_lib_read(substream, buf, count); 2779 if (result > 0) 2780 result = frames_to_bytes(runtime, result); 2781 return result; 2782 } 2783 2784 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2785 size_t count, loff_t * offset) 2786 { 2787 struct snd_pcm_file *pcm_file; 2788 struct snd_pcm_substream *substream; 2789 struct snd_pcm_runtime *runtime; 2790 snd_pcm_sframes_t result; 2791 2792 pcm_file = file->private_data; 2793 substream = pcm_file->substream; 2794 if (PCM_RUNTIME_CHECK(substream)) 2795 return -ENXIO; 2796 runtime = substream->runtime; 2797 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2798 return -EBADFD; 2799 if (!frame_aligned(runtime, count)) 2800 return -EINVAL; 2801 count = bytes_to_frames(runtime, count); 2802 result = snd_pcm_lib_write(substream, buf, count); 2803 if (result > 0) 2804 result = frames_to_bytes(runtime, result); 2805 return result; 2806 } 2807 2808 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 2809 unsigned long nr_segs, loff_t pos) 2810 2811 { 2812 struct snd_pcm_file *pcm_file; 2813 struct snd_pcm_substream *substream; 2814 struct snd_pcm_runtime *runtime; 2815 snd_pcm_sframes_t result; 2816 unsigned long i; 2817 void __user **bufs; 2818 snd_pcm_uframes_t frames; 2819 2820 pcm_file = iocb->ki_filp->private_data; 2821 substream = pcm_file->substream; 2822 if (PCM_RUNTIME_CHECK(substream)) 2823 return -ENXIO; 2824 runtime = substream->runtime; 2825 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2826 return -EBADFD; 2827 if (nr_segs > 1024 || nr_segs != runtime->channels) 2828 return -EINVAL; 2829 if (!frame_aligned(runtime, iov->iov_len)) 2830 return -EINVAL; 2831 frames = bytes_to_samples(runtime, iov->iov_len); 2832 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2833 if (bufs == NULL) 2834 return -ENOMEM; 2835 for (i = 0; i < nr_segs; ++i) 2836 bufs[i] = iov[i].iov_base; 2837 result = snd_pcm_lib_readv(substream, bufs, frames); 2838 if (result > 0) 2839 result = frames_to_bytes(runtime, result); 2840 kfree(bufs); 2841 return result; 2842 } 2843 2844 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 2845 unsigned long nr_segs, loff_t pos) 2846 { 2847 struct snd_pcm_file *pcm_file; 2848 struct snd_pcm_substream *substream; 2849 struct snd_pcm_runtime *runtime; 2850 snd_pcm_sframes_t result; 2851 unsigned long i; 2852 void __user **bufs; 2853 snd_pcm_uframes_t frames; 2854 2855 pcm_file = iocb->ki_filp->private_data; 2856 substream = pcm_file->substream; 2857 if (PCM_RUNTIME_CHECK(substream)) 2858 return -ENXIO; 2859 runtime = substream->runtime; 2860 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2861 return -EBADFD; 2862 if (nr_segs > 128 || nr_segs != runtime->channels || 2863 !frame_aligned(runtime, iov->iov_len)) 2864 return -EINVAL; 2865 frames = bytes_to_samples(runtime, iov->iov_len); 2866 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2867 if (bufs == NULL) 2868 return -ENOMEM; 2869 for (i = 0; i < nr_segs; ++i) 2870 bufs[i] = iov[i].iov_base; 2871 result = snd_pcm_lib_writev(substream, bufs, frames); 2872 if (result > 0) 2873 result = frames_to_bytes(runtime, result); 2874 kfree(bufs); 2875 return result; 2876 } 2877 2878 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 2879 { 2880 struct snd_pcm_file *pcm_file; 2881 struct snd_pcm_substream *substream; 2882 struct snd_pcm_runtime *runtime; 2883 unsigned int mask; 2884 snd_pcm_uframes_t avail; 2885 2886 pcm_file = file->private_data; 2887 2888 substream = pcm_file->substream; 2889 if (PCM_RUNTIME_CHECK(substream)) 2890 return -ENXIO; 2891 runtime = substream->runtime; 2892 2893 poll_wait(file, &runtime->sleep, wait); 2894 2895 snd_pcm_stream_lock_irq(substream); 2896 avail = snd_pcm_playback_avail(runtime); 2897 switch (runtime->status->state) { 2898 case SNDRV_PCM_STATE_RUNNING: 2899 case SNDRV_PCM_STATE_PREPARED: 2900 case SNDRV_PCM_STATE_PAUSED: 2901 if (avail >= runtime->control->avail_min) { 2902 mask = POLLOUT | POLLWRNORM; 2903 break; 2904 } 2905 /* Fall through */ 2906 case SNDRV_PCM_STATE_DRAINING: 2907 mask = 0; 2908 break; 2909 default: 2910 mask = POLLOUT | POLLWRNORM | POLLERR; 2911 break; 2912 } 2913 snd_pcm_stream_unlock_irq(substream); 2914 return mask; 2915 } 2916 2917 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 2918 { 2919 struct snd_pcm_file *pcm_file; 2920 struct snd_pcm_substream *substream; 2921 struct snd_pcm_runtime *runtime; 2922 unsigned int mask; 2923 snd_pcm_uframes_t avail; 2924 2925 pcm_file = file->private_data; 2926 2927 substream = pcm_file->substream; 2928 if (PCM_RUNTIME_CHECK(substream)) 2929 return -ENXIO; 2930 runtime = substream->runtime; 2931 2932 poll_wait(file, &runtime->sleep, wait); 2933 2934 snd_pcm_stream_lock_irq(substream); 2935 avail = snd_pcm_capture_avail(runtime); 2936 switch (runtime->status->state) { 2937 case SNDRV_PCM_STATE_RUNNING: 2938 case SNDRV_PCM_STATE_PREPARED: 2939 case SNDRV_PCM_STATE_PAUSED: 2940 if (avail >= runtime->control->avail_min) { 2941 mask = POLLIN | POLLRDNORM; 2942 break; 2943 } 2944 mask = 0; 2945 break; 2946 case SNDRV_PCM_STATE_DRAINING: 2947 if (avail > 0) { 2948 mask = POLLIN | POLLRDNORM; 2949 break; 2950 } 2951 /* Fall through */ 2952 default: 2953 mask = POLLIN | POLLRDNORM | POLLERR; 2954 break; 2955 } 2956 snd_pcm_stream_unlock_irq(substream); 2957 return mask; 2958 } 2959 2960 /* 2961 * mmap support 2962 */ 2963 2964 /* 2965 * Only on coherent architectures, we can mmap the status and the control records 2966 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 2967 */ 2968 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 2969 /* 2970 * mmap status record 2971 */ 2972 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 2973 struct vm_fault *vmf) 2974 { 2975 struct snd_pcm_substream *substream = area->vm_private_data; 2976 struct snd_pcm_runtime *runtime; 2977 2978 if (substream == NULL) 2979 return VM_FAULT_SIGBUS; 2980 runtime = substream->runtime; 2981 vmf->page = virt_to_page(runtime->status); 2982 get_page(vmf->page); 2983 return 0; 2984 } 2985 2986 static struct vm_operations_struct snd_pcm_vm_ops_status = 2987 { 2988 .fault = snd_pcm_mmap_status_fault, 2989 }; 2990 2991 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 2992 struct vm_area_struct *area) 2993 { 2994 struct snd_pcm_runtime *runtime; 2995 long size; 2996 if (!(area->vm_flags & VM_READ)) 2997 return -EINVAL; 2998 runtime = substream->runtime; 2999 size = area->vm_end - area->vm_start; 3000 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3001 return -EINVAL; 3002 area->vm_ops = &snd_pcm_vm_ops_status; 3003 area->vm_private_data = substream; 3004 area->vm_flags |= VM_RESERVED; 3005 return 0; 3006 } 3007 3008 /* 3009 * mmap control record 3010 */ 3011 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3012 struct vm_fault *vmf) 3013 { 3014 struct snd_pcm_substream *substream = area->vm_private_data; 3015 struct snd_pcm_runtime *runtime; 3016 3017 if (substream == NULL) 3018 return VM_FAULT_SIGBUS; 3019 runtime = substream->runtime; 3020 vmf->page = virt_to_page(runtime->control); 3021 get_page(vmf->page); 3022 return 0; 3023 } 3024 3025 static struct vm_operations_struct snd_pcm_vm_ops_control = 3026 { 3027 .fault = snd_pcm_mmap_control_fault, 3028 }; 3029 3030 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3031 struct vm_area_struct *area) 3032 { 3033 struct snd_pcm_runtime *runtime; 3034 long size; 3035 if (!(area->vm_flags & VM_READ)) 3036 return -EINVAL; 3037 runtime = substream->runtime; 3038 size = area->vm_end - area->vm_start; 3039 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3040 return -EINVAL; 3041 area->vm_ops = &snd_pcm_vm_ops_control; 3042 area->vm_private_data = substream; 3043 area->vm_flags |= VM_RESERVED; 3044 return 0; 3045 } 3046 #else /* ! coherent mmap */ 3047 /* 3048 * don't support mmap for status and control records. 3049 */ 3050 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3051 struct vm_area_struct *area) 3052 { 3053 return -ENXIO; 3054 } 3055 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3056 struct vm_area_struct *area) 3057 { 3058 return -ENXIO; 3059 } 3060 #endif /* coherent mmap */ 3061 3062 /* 3063 * fault callback for mmapping a RAM page 3064 */ 3065 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3066 struct vm_fault *vmf) 3067 { 3068 struct snd_pcm_substream *substream = area->vm_private_data; 3069 struct snd_pcm_runtime *runtime; 3070 unsigned long offset; 3071 struct page * page; 3072 void *vaddr; 3073 size_t dma_bytes; 3074 3075 if (substream == NULL) 3076 return VM_FAULT_SIGBUS; 3077 runtime = substream->runtime; 3078 offset = vmf->pgoff << PAGE_SHIFT; 3079 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3080 if (offset > dma_bytes - PAGE_SIZE) 3081 return VM_FAULT_SIGBUS; 3082 if (substream->ops->page) { 3083 page = substream->ops->page(substream, offset); 3084 if (!page) 3085 return VM_FAULT_SIGBUS; 3086 } else { 3087 vaddr = runtime->dma_area + offset; 3088 page = virt_to_page(vaddr); 3089 } 3090 get_page(page); 3091 vmf->page = page; 3092 return 0; 3093 } 3094 3095 static struct vm_operations_struct snd_pcm_vm_ops_data = 3096 { 3097 .open = snd_pcm_mmap_data_open, 3098 .close = snd_pcm_mmap_data_close, 3099 .fault = snd_pcm_mmap_data_fault, 3100 }; 3101 3102 /* 3103 * mmap the DMA buffer on RAM 3104 */ 3105 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream, 3106 struct vm_area_struct *area) 3107 { 3108 area->vm_ops = &snd_pcm_vm_ops_data; 3109 area->vm_private_data = substream; 3110 area->vm_flags |= VM_RESERVED; 3111 atomic_inc(&substream->mmap_count); 3112 return 0; 3113 } 3114 3115 /* 3116 * mmap the DMA buffer on I/O memory area 3117 */ 3118 #if SNDRV_PCM_INFO_MMAP_IOMEM 3119 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio = 3120 { 3121 .open = snd_pcm_mmap_data_open, 3122 .close = snd_pcm_mmap_data_close, 3123 }; 3124 3125 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3126 struct vm_area_struct *area) 3127 { 3128 long size; 3129 unsigned long offset; 3130 3131 #ifdef pgprot_noncached 3132 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3133 #endif 3134 area->vm_ops = &snd_pcm_vm_ops_data_mmio; 3135 area->vm_private_data = substream; 3136 area->vm_flags |= VM_IO; 3137 size = area->vm_end - area->vm_start; 3138 offset = area->vm_pgoff << PAGE_SHIFT; 3139 if (io_remap_pfn_range(area, area->vm_start, 3140 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT, 3141 size, area->vm_page_prot)) 3142 return -EAGAIN; 3143 atomic_inc(&substream->mmap_count); 3144 return 0; 3145 } 3146 3147 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3148 #endif /* SNDRV_PCM_INFO_MMAP */ 3149 3150 /* 3151 * mmap DMA buffer 3152 */ 3153 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3154 struct vm_area_struct *area) 3155 { 3156 struct snd_pcm_runtime *runtime; 3157 long size; 3158 unsigned long offset; 3159 size_t dma_bytes; 3160 3161 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3162 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3163 return -EINVAL; 3164 } else { 3165 if (!(area->vm_flags & VM_READ)) 3166 return -EINVAL; 3167 } 3168 runtime = substream->runtime; 3169 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3170 return -EBADFD; 3171 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3172 return -ENXIO; 3173 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3174 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3175 return -EINVAL; 3176 size = area->vm_end - area->vm_start; 3177 offset = area->vm_pgoff << PAGE_SHIFT; 3178 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3179 if ((size_t)size > dma_bytes) 3180 return -EINVAL; 3181 if (offset > dma_bytes - size) 3182 return -EINVAL; 3183 3184 if (substream->ops->mmap) 3185 return substream->ops->mmap(substream, area); 3186 else 3187 return snd_pcm_default_mmap(substream, area); 3188 } 3189 3190 EXPORT_SYMBOL(snd_pcm_mmap_data); 3191 3192 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3193 { 3194 struct snd_pcm_file * pcm_file; 3195 struct snd_pcm_substream *substream; 3196 unsigned long offset; 3197 3198 pcm_file = file->private_data; 3199 substream = pcm_file->substream; 3200 if (PCM_RUNTIME_CHECK(substream)) 3201 return -ENXIO; 3202 3203 offset = area->vm_pgoff << PAGE_SHIFT; 3204 switch (offset) { 3205 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3206 if (pcm_file->no_compat_mmap) 3207 return -ENXIO; 3208 return snd_pcm_mmap_status(substream, file, area); 3209 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3210 if (pcm_file->no_compat_mmap) 3211 return -ENXIO; 3212 return snd_pcm_mmap_control(substream, file, area); 3213 default: 3214 return snd_pcm_mmap_data(substream, file, area); 3215 } 3216 return 0; 3217 } 3218 3219 static int snd_pcm_fasync(int fd, struct file * file, int on) 3220 { 3221 struct snd_pcm_file * pcm_file; 3222 struct snd_pcm_substream *substream; 3223 struct snd_pcm_runtime *runtime; 3224 int err = -ENXIO; 3225 3226 lock_kernel(); 3227 pcm_file = file->private_data; 3228 substream = pcm_file->substream; 3229 if (PCM_RUNTIME_CHECK(substream)) 3230 goto out; 3231 runtime = substream->runtime; 3232 err = fasync_helper(fd, file, on, &runtime->fasync); 3233 out: 3234 unlock_kernel(); 3235 return err; 3236 } 3237 3238 /* 3239 * ioctl32 compat 3240 */ 3241 #ifdef CONFIG_COMPAT 3242 #include "pcm_compat.c" 3243 #else 3244 #define snd_pcm_ioctl_compat NULL 3245 #endif 3246 3247 /* 3248 * To be removed helpers to keep binary compatibility 3249 */ 3250 3251 #ifdef CONFIG_SND_SUPPORT_OLD_API 3252 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3253 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3254 3255 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3256 struct snd_pcm_hw_params_old *oparams) 3257 { 3258 unsigned int i; 3259 3260 memset(params, 0, sizeof(*params)); 3261 params->flags = oparams->flags; 3262 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3263 params->masks[i].bits[0] = oparams->masks[i]; 3264 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3265 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3266 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3267 params->info = oparams->info; 3268 params->msbits = oparams->msbits; 3269 params->rate_num = oparams->rate_num; 3270 params->rate_den = oparams->rate_den; 3271 params->fifo_size = oparams->fifo_size; 3272 } 3273 3274 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3275 struct snd_pcm_hw_params *params) 3276 { 3277 unsigned int i; 3278 3279 memset(oparams, 0, sizeof(*oparams)); 3280 oparams->flags = params->flags; 3281 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3282 oparams->masks[i] = params->masks[i].bits[0]; 3283 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3284 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3285 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3286 oparams->info = params->info; 3287 oparams->msbits = params->msbits; 3288 oparams->rate_num = params->rate_num; 3289 oparams->rate_den = params->rate_den; 3290 oparams->fifo_size = params->fifo_size; 3291 } 3292 3293 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3294 struct snd_pcm_hw_params_old __user * _oparams) 3295 { 3296 struct snd_pcm_hw_params *params; 3297 struct snd_pcm_hw_params_old *oparams = NULL; 3298 int err; 3299 3300 params = kmalloc(sizeof(*params), GFP_KERNEL); 3301 if (!params) 3302 return -ENOMEM; 3303 3304 oparams = memdup_user(_oparams, sizeof(*oparams)); 3305 if (IS_ERR(oparams)) { 3306 err = PTR_ERR(oparams); 3307 goto out; 3308 } 3309 snd_pcm_hw_convert_from_old_params(params, oparams); 3310 err = snd_pcm_hw_refine(substream, params); 3311 snd_pcm_hw_convert_to_old_params(oparams, params); 3312 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3313 if (!err) 3314 err = -EFAULT; 3315 } 3316 3317 kfree(oparams); 3318 out: 3319 kfree(params); 3320 return err; 3321 } 3322 3323 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3324 struct snd_pcm_hw_params_old __user * _oparams) 3325 { 3326 struct snd_pcm_hw_params *params; 3327 struct snd_pcm_hw_params_old *oparams = NULL; 3328 int err; 3329 3330 params = kmalloc(sizeof(*params), GFP_KERNEL); 3331 if (!params) 3332 return -ENOMEM; 3333 3334 oparams = memdup_user(_oparams, sizeof(*oparams)); 3335 if (IS_ERR(oparams)) { 3336 err = PTR_ERR(oparams); 3337 goto out; 3338 } 3339 snd_pcm_hw_convert_from_old_params(params, oparams); 3340 err = snd_pcm_hw_params(substream, params); 3341 snd_pcm_hw_convert_to_old_params(oparams, params); 3342 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3343 if (!err) 3344 err = -EFAULT; 3345 } 3346 3347 kfree(oparams); 3348 out: 3349 kfree(params); 3350 return err; 3351 } 3352 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3353 3354 #ifndef CONFIG_MMU 3355 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr, 3356 unsigned long len, unsigned long pgoff, 3357 unsigned long flags) 3358 { 3359 return 0; 3360 } 3361 #else 3362 # define dummy_get_unmapped_area NULL 3363 #endif 3364 3365 /* 3366 * Register section 3367 */ 3368 3369 const struct file_operations snd_pcm_f_ops[2] = { 3370 { 3371 .owner = THIS_MODULE, 3372 .write = snd_pcm_write, 3373 .aio_write = snd_pcm_aio_write, 3374 .open = snd_pcm_playback_open, 3375 .release = snd_pcm_release, 3376 .poll = snd_pcm_playback_poll, 3377 .unlocked_ioctl = snd_pcm_playback_ioctl, 3378 .compat_ioctl = snd_pcm_ioctl_compat, 3379 .mmap = snd_pcm_mmap, 3380 .fasync = snd_pcm_fasync, 3381 .get_unmapped_area = dummy_get_unmapped_area, 3382 }, 3383 { 3384 .owner = THIS_MODULE, 3385 .read = snd_pcm_read, 3386 .aio_read = snd_pcm_aio_read, 3387 .open = snd_pcm_capture_open, 3388 .release = snd_pcm_release, 3389 .poll = snd_pcm_capture_poll, 3390 .unlocked_ioctl = snd_pcm_capture_ioctl, 3391 .compat_ioctl = snd_pcm_ioctl_compat, 3392 .mmap = snd_pcm_mmap, 3393 .fasync = snd_pcm_fasync, 3394 .get_unmapped_area = dummy_get_unmapped_area, 3395 } 3396 }; 3397