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