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