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 - start all linked streams 879 * @substream: the PCM substream instance 880 */ 881 int snd_pcm_start(struct snd_pcm_substream *substream) 882 { 883 return snd_pcm_action(&snd_pcm_action_start, substream, 884 SNDRV_PCM_STATE_RUNNING); 885 } 886 887 /* 888 * stop callbacks 889 */ 890 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 891 { 892 struct snd_pcm_runtime *runtime = substream->runtime; 893 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 894 return -EBADFD; 895 runtime->trigger_master = substream; 896 return 0; 897 } 898 899 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 900 { 901 if (substream->runtime->trigger_master == substream && 902 snd_pcm_running(substream)) 903 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 904 return 0; /* unconditonally stop all substreams */ 905 } 906 907 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 908 { 909 struct snd_pcm_runtime *runtime = substream->runtime; 910 if (runtime->status->state != state) { 911 snd_pcm_trigger_tstamp(substream); 912 if (substream->timer) 913 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 914 &runtime->trigger_tstamp); 915 runtime->status->state = state; 916 } 917 wake_up(&runtime->sleep); 918 } 919 920 static struct action_ops snd_pcm_action_stop = { 921 .pre_action = snd_pcm_pre_stop, 922 .do_action = snd_pcm_do_stop, 923 .post_action = snd_pcm_post_stop 924 }; 925 926 /** 927 * snd_pcm_stop - try to stop all running streams in the substream group 928 * @substream: the PCM substream instance 929 * @state: PCM state after stopping the stream 930 * 931 * The state of each stream is then changed to the given state unconditionally. 932 */ 933 int snd_pcm_stop(struct snd_pcm_substream *substream, int state) 934 { 935 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 936 } 937 938 EXPORT_SYMBOL(snd_pcm_stop); 939 940 /** 941 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 942 * @substream: the PCM substream 943 * 944 * After stopping, the state is changed to SETUP. 945 * Unlike snd_pcm_stop(), this affects only the given stream. 946 */ 947 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 948 { 949 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 950 SNDRV_PCM_STATE_SETUP); 951 } 952 953 /* 954 * pause callbacks 955 */ 956 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 957 { 958 struct snd_pcm_runtime *runtime = substream->runtime; 959 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 960 return -ENOSYS; 961 if (push) { 962 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 963 return -EBADFD; 964 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 965 return -EBADFD; 966 runtime->trigger_master = substream; 967 return 0; 968 } 969 970 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 971 { 972 if (substream->runtime->trigger_master != substream) 973 return 0; 974 return substream->ops->trigger(substream, 975 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 976 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 977 } 978 979 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 980 { 981 if (substream->runtime->trigger_master == substream) 982 substream->ops->trigger(substream, 983 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 984 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 985 } 986 987 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 988 { 989 struct snd_pcm_runtime *runtime = substream->runtime; 990 snd_pcm_trigger_tstamp(substream); 991 if (push) { 992 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 993 if (substream->timer) 994 snd_timer_notify(substream->timer, 995 SNDRV_TIMER_EVENT_MPAUSE, 996 &runtime->trigger_tstamp); 997 wake_up(&runtime->sleep); 998 } else { 999 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1000 if (substream->timer) 1001 snd_timer_notify(substream->timer, 1002 SNDRV_TIMER_EVENT_MCONTINUE, 1003 &runtime->trigger_tstamp); 1004 } 1005 } 1006 1007 static struct action_ops snd_pcm_action_pause = { 1008 .pre_action = snd_pcm_pre_pause, 1009 .do_action = snd_pcm_do_pause, 1010 .undo_action = snd_pcm_undo_pause, 1011 .post_action = snd_pcm_post_pause 1012 }; 1013 1014 /* 1015 * Push/release the pause for all linked streams. 1016 */ 1017 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1018 { 1019 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1020 } 1021 1022 #ifdef CONFIG_PM 1023 /* suspend */ 1024 1025 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1026 { 1027 struct snd_pcm_runtime *runtime = substream->runtime; 1028 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1029 return -EBUSY; 1030 runtime->trigger_master = substream; 1031 return 0; 1032 } 1033 1034 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1035 { 1036 struct snd_pcm_runtime *runtime = substream->runtime; 1037 if (runtime->trigger_master != substream) 1038 return 0; 1039 if (! snd_pcm_running(substream)) 1040 return 0; 1041 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1042 return 0; /* suspend unconditionally */ 1043 } 1044 1045 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1046 { 1047 struct snd_pcm_runtime *runtime = substream->runtime; 1048 snd_pcm_trigger_tstamp(substream); 1049 if (substream->timer) 1050 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1051 &runtime->trigger_tstamp); 1052 runtime->status->suspended_state = runtime->status->state; 1053 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1054 wake_up(&runtime->sleep); 1055 } 1056 1057 static struct action_ops snd_pcm_action_suspend = { 1058 .pre_action = snd_pcm_pre_suspend, 1059 .do_action = snd_pcm_do_suspend, 1060 .post_action = snd_pcm_post_suspend 1061 }; 1062 1063 /** 1064 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1065 * @substream: the PCM substream 1066 * 1067 * After this call, all streams are changed to SUSPENDED state. 1068 */ 1069 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1070 { 1071 int err; 1072 unsigned long flags; 1073 1074 if (! substream) 1075 return 0; 1076 1077 snd_pcm_stream_lock_irqsave(substream, flags); 1078 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1079 snd_pcm_stream_unlock_irqrestore(substream, flags); 1080 return err; 1081 } 1082 1083 EXPORT_SYMBOL(snd_pcm_suspend); 1084 1085 /** 1086 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1087 * @pcm: the PCM instance 1088 * 1089 * After this call, all streams are changed to SUSPENDED state. 1090 */ 1091 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1092 { 1093 struct snd_pcm_substream *substream; 1094 int stream, err = 0; 1095 1096 if (! pcm) 1097 return 0; 1098 1099 for (stream = 0; stream < 2; stream++) { 1100 for (substream = pcm->streams[stream].substream; 1101 substream; substream = substream->next) { 1102 /* FIXME: the open/close code should lock this as well */ 1103 if (substream->runtime == NULL) 1104 continue; 1105 err = snd_pcm_suspend(substream); 1106 if (err < 0 && err != -EBUSY) 1107 return err; 1108 } 1109 } 1110 return 0; 1111 } 1112 1113 EXPORT_SYMBOL(snd_pcm_suspend_all); 1114 1115 /* resume */ 1116 1117 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1118 { 1119 struct snd_pcm_runtime *runtime = substream->runtime; 1120 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1121 return -ENOSYS; 1122 runtime->trigger_master = substream; 1123 return 0; 1124 } 1125 1126 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1127 { 1128 struct snd_pcm_runtime *runtime = substream->runtime; 1129 if (runtime->trigger_master != substream) 1130 return 0; 1131 /* DMA not running previously? */ 1132 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1133 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1134 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1135 return 0; 1136 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1137 } 1138 1139 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1140 { 1141 if (substream->runtime->trigger_master == substream && 1142 snd_pcm_running(substream)) 1143 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1144 } 1145 1146 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1147 { 1148 struct snd_pcm_runtime *runtime = substream->runtime; 1149 snd_pcm_trigger_tstamp(substream); 1150 if (substream->timer) 1151 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1152 &runtime->trigger_tstamp); 1153 runtime->status->state = runtime->status->suspended_state; 1154 } 1155 1156 static struct action_ops snd_pcm_action_resume = { 1157 .pre_action = snd_pcm_pre_resume, 1158 .do_action = snd_pcm_do_resume, 1159 .undo_action = snd_pcm_undo_resume, 1160 .post_action = snd_pcm_post_resume 1161 }; 1162 1163 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1164 { 1165 struct snd_card *card = substream->pcm->card; 1166 int res; 1167 1168 snd_power_lock(card); 1169 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1170 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1171 snd_power_unlock(card); 1172 return res; 1173 } 1174 1175 #else 1176 1177 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1178 { 1179 return -ENOSYS; 1180 } 1181 1182 #endif /* CONFIG_PM */ 1183 1184 /* 1185 * xrun ioctl 1186 * 1187 * Change the RUNNING stream(s) to XRUN state. 1188 */ 1189 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1190 { 1191 struct snd_card *card = substream->pcm->card; 1192 struct snd_pcm_runtime *runtime = substream->runtime; 1193 int result; 1194 1195 snd_power_lock(card); 1196 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1197 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1198 if (result < 0) 1199 goto _unlock; 1200 } 1201 1202 snd_pcm_stream_lock_irq(substream); 1203 switch (runtime->status->state) { 1204 case SNDRV_PCM_STATE_XRUN: 1205 result = 0; /* already there */ 1206 break; 1207 case SNDRV_PCM_STATE_RUNNING: 1208 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1209 break; 1210 default: 1211 result = -EBADFD; 1212 } 1213 snd_pcm_stream_unlock_irq(substream); 1214 _unlock: 1215 snd_power_unlock(card); 1216 return result; 1217 } 1218 1219 /* 1220 * reset ioctl 1221 */ 1222 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1223 { 1224 struct snd_pcm_runtime *runtime = substream->runtime; 1225 switch (runtime->status->state) { 1226 case SNDRV_PCM_STATE_RUNNING: 1227 case SNDRV_PCM_STATE_PREPARED: 1228 case SNDRV_PCM_STATE_PAUSED: 1229 case SNDRV_PCM_STATE_SUSPENDED: 1230 return 0; 1231 default: 1232 return -EBADFD; 1233 } 1234 } 1235 1236 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1237 { 1238 struct snd_pcm_runtime *runtime = substream->runtime; 1239 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1240 if (err < 0) 1241 return err; 1242 runtime->hw_ptr_base = 0; 1243 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1244 runtime->status->hw_ptr % runtime->period_size; 1245 runtime->silence_start = runtime->status->hw_ptr; 1246 runtime->silence_filled = 0; 1247 return 0; 1248 } 1249 1250 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1251 { 1252 struct snd_pcm_runtime *runtime = substream->runtime; 1253 runtime->control->appl_ptr = runtime->status->hw_ptr; 1254 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1255 runtime->silence_size > 0) 1256 snd_pcm_playback_silence(substream, ULONG_MAX); 1257 } 1258 1259 static struct action_ops snd_pcm_action_reset = { 1260 .pre_action = snd_pcm_pre_reset, 1261 .do_action = snd_pcm_do_reset, 1262 .post_action = snd_pcm_post_reset 1263 }; 1264 1265 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1266 { 1267 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1268 } 1269 1270 /* 1271 * prepare ioctl 1272 */ 1273 /* we use the second argument for updating f_flags */ 1274 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1275 int f_flags) 1276 { 1277 struct snd_pcm_runtime *runtime = substream->runtime; 1278 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1279 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1280 return -EBADFD; 1281 if (snd_pcm_running(substream)) 1282 return -EBUSY; 1283 substream->f_flags = f_flags; 1284 return 0; 1285 } 1286 1287 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1288 { 1289 int err; 1290 err = substream->ops->prepare(substream); 1291 if (err < 0) 1292 return err; 1293 return snd_pcm_do_reset(substream, 0); 1294 } 1295 1296 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1297 { 1298 struct snd_pcm_runtime *runtime = substream->runtime; 1299 runtime->control->appl_ptr = runtime->status->hw_ptr; 1300 runtime->status->state = SNDRV_PCM_STATE_PREPARED; 1301 } 1302 1303 static struct action_ops snd_pcm_action_prepare = { 1304 .pre_action = snd_pcm_pre_prepare, 1305 .do_action = snd_pcm_do_prepare, 1306 .post_action = snd_pcm_post_prepare 1307 }; 1308 1309 /** 1310 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1311 * @substream: the PCM substream instance 1312 * @file: file to refer f_flags 1313 */ 1314 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1315 struct file *file) 1316 { 1317 int res; 1318 struct snd_card *card = substream->pcm->card; 1319 int f_flags; 1320 1321 if (file) 1322 f_flags = file->f_flags; 1323 else 1324 f_flags = substream->f_flags; 1325 1326 snd_power_lock(card); 1327 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1328 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1329 substream, f_flags); 1330 snd_power_unlock(card); 1331 return res; 1332 } 1333 1334 /* 1335 * drain ioctl 1336 */ 1337 1338 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1339 { 1340 if (substream->f_flags & O_NONBLOCK) 1341 return -EAGAIN; 1342 substream->runtime->trigger_master = substream; 1343 return 0; 1344 } 1345 1346 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1347 { 1348 struct snd_pcm_runtime *runtime = substream->runtime; 1349 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1350 switch (runtime->status->state) { 1351 case SNDRV_PCM_STATE_PREPARED: 1352 /* start playback stream if possible */ 1353 if (! snd_pcm_playback_empty(substream)) { 1354 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1355 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1356 } 1357 break; 1358 case SNDRV_PCM_STATE_RUNNING: 1359 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1360 break; 1361 default: 1362 break; 1363 } 1364 } else { 1365 /* stop running stream */ 1366 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1367 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1368 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1369 snd_pcm_do_stop(substream, new_state); 1370 snd_pcm_post_stop(substream, new_state); 1371 } 1372 } 1373 return 0; 1374 } 1375 1376 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1377 { 1378 } 1379 1380 static struct action_ops snd_pcm_action_drain_init = { 1381 .pre_action = snd_pcm_pre_drain_init, 1382 .do_action = snd_pcm_do_drain_init, 1383 .post_action = snd_pcm_post_drain_init 1384 }; 1385 1386 struct drain_rec { 1387 struct snd_pcm_substream *substream; 1388 wait_queue_t wait; 1389 snd_pcm_uframes_t stop_threshold; 1390 }; 1391 1392 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1393 1394 /* 1395 * Drain the stream(s). 1396 * When the substream is linked, sync until the draining of all playback streams 1397 * is finished. 1398 * After this call, all streams are supposed to be either SETUP or DRAINING 1399 * (capture only) state. 1400 */ 1401 static int snd_pcm_drain(struct snd_pcm_substream *substream) 1402 { 1403 struct snd_card *card; 1404 struct snd_pcm_runtime *runtime; 1405 struct snd_pcm_substream *s; 1406 int result = 0; 1407 int i, num_drecs; 1408 struct drain_rec *drec, drec_tmp, *d; 1409 1410 card = substream->pcm->card; 1411 runtime = substream->runtime; 1412 1413 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1414 return -EBADFD; 1415 1416 snd_power_lock(card); 1417 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1418 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1419 if (result < 0) { 1420 snd_power_unlock(card); 1421 return result; 1422 } 1423 } 1424 1425 /* allocate temporary record for drain sync */ 1426 down_read(&snd_pcm_link_rwsem); 1427 if (snd_pcm_stream_linked(substream)) { 1428 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL); 1429 if (! drec) { 1430 up_read(&snd_pcm_link_rwsem); 1431 snd_power_unlock(card); 1432 return -ENOMEM; 1433 } 1434 } else 1435 drec = &drec_tmp; 1436 1437 /* count only playback streams */ 1438 num_drecs = 0; 1439 snd_pcm_group_for_each_entry(s, substream) { 1440 runtime = s->runtime; 1441 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1442 d = &drec[num_drecs++]; 1443 d->substream = s; 1444 init_waitqueue_entry(&d->wait, current); 1445 add_wait_queue(&runtime->sleep, &d->wait); 1446 /* stop_threshold fixup to avoid endless loop when 1447 * stop_threshold > buffer_size 1448 */ 1449 d->stop_threshold = runtime->stop_threshold; 1450 if (runtime->stop_threshold > runtime->buffer_size) 1451 runtime->stop_threshold = runtime->buffer_size; 1452 } 1453 } 1454 up_read(&snd_pcm_link_rwsem); 1455 1456 snd_pcm_stream_lock_irq(substream); 1457 /* resume pause */ 1458 if (substream->runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1459 snd_pcm_pause(substream, 0); 1460 1461 /* pre-start/stop - all running streams are changed to DRAINING state */ 1462 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1463 if (result < 0) { 1464 snd_pcm_stream_unlock_irq(substream); 1465 goto _error; 1466 } 1467 1468 for (;;) { 1469 long tout; 1470 if (signal_pending(current)) { 1471 result = -ERESTARTSYS; 1472 break; 1473 } 1474 /* all finished? */ 1475 for (i = 0; i < num_drecs; i++) { 1476 runtime = drec[i].substream->runtime; 1477 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) 1478 break; 1479 } 1480 if (i == num_drecs) 1481 break; /* yes, all drained */ 1482 1483 set_current_state(TASK_INTERRUPTIBLE); 1484 snd_pcm_stream_unlock_irq(substream); 1485 snd_power_unlock(card); 1486 tout = schedule_timeout(10 * HZ); 1487 snd_power_lock(card); 1488 snd_pcm_stream_lock_irq(substream); 1489 if (tout == 0) { 1490 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1491 result = -ESTRPIPE; 1492 else { 1493 snd_printd("playback drain error (DMA or IRQ trouble?)\n"); 1494 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1495 result = -EIO; 1496 } 1497 break; 1498 } 1499 } 1500 1501 snd_pcm_stream_unlock_irq(substream); 1502 1503 _error: 1504 for (i = 0; i < num_drecs; i++) { 1505 d = &drec[i]; 1506 runtime = d->substream->runtime; 1507 remove_wait_queue(&runtime->sleep, &d->wait); 1508 runtime->stop_threshold = d->stop_threshold; 1509 } 1510 1511 if (drec != &drec_tmp) 1512 kfree(drec); 1513 snd_power_unlock(card); 1514 1515 return result; 1516 } 1517 1518 /* 1519 * drop ioctl 1520 * 1521 * Immediately put all linked substreams into SETUP state. 1522 */ 1523 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1524 { 1525 struct snd_pcm_runtime *runtime; 1526 struct snd_card *card; 1527 int result = 0; 1528 1529 if (PCM_RUNTIME_CHECK(substream)) 1530 return -ENXIO; 1531 runtime = substream->runtime; 1532 card = substream->pcm->card; 1533 1534 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1535 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1536 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1537 return -EBADFD; 1538 1539 snd_pcm_stream_lock_irq(substream); 1540 /* resume pause */ 1541 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1542 snd_pcm_pause(substream, 0); 1543 1544 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1545 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1546 snd_pcm_stream_unlock_irq(substream); 1547 1548 return result; 1549 } 1550 1551 1552 /* WARNING: Don't forget to fput back the file */ 1553 static struct file *snd_pcm_file_fd(int fd) 1554 { 1555 struct file *file; 1556 struct inode *inode; 1557 unsigned int minor; 1558 1559 file = fget(fd); 1560 if (!file) 1561 return NULL; 1562 inode = file->f_path.dentry->d_inode; 1563 if (!S_ISCHR(inode->i_mode) || 1564 imajor(inode) != snd_major) { 1565 fput(file); 1566 return NULL; 1567 } 1568 minor = iminor(inode); 1569 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) && 1570 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) { 1571 fput(file); 1572 return NULL; 1573 } 1574 return file; 1575 } 1576 1577 /* 1578 * PCM link handling 1579 */ 1580 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1581 { 1582 int res = 0; 1583 struct file *file; 1584 struct snd_pcm_file *pcm_file; 1585 struct snd_pcm_substream *substream1; 1586 1587 file = snd_pcm_file_fd(fd); 1588 if (!file) 1589 return -EBADFD; 1590 pcm_file = file->private_data; 1591 substream1 = pcm_file->substream; 1592 down_write(&snd_pcm_link_rwsem); 1593 write_lock_irq(&snd_pcm_link_rwlock); 1594 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1595 substream->runtime->status->state != substream1->runtime->status->state) { 1596 res = -EBADFD; 1597 goto _end; 1598 } 1599 if (snd_pcm_stream_linked(substream1)) { 1600 res = -EALREADY; 1601 goto _end; 1602 } 1603 if (!snd_pcm_stream_linked(substream)) { 1604 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC); 1605 if (substream->group == NULL) { 1606 res = -ENOMEM; 1607 goto _end; 1608 } 1609 spin_lock_init(&substream->group->lock); 1610 INIT_LIST_HEAD(&substream->group->substreams); 1611 list_add_tail(&substream->link_list, &substream->group->substreams); 1612 substream->group->count = 1; 1613 } 1614 list_add_tail(&substream1->link_list, &substream->group->substreams); 1615 substream->group->count++; 1616 substream1->group = substream->group; 1617 _end: 1618 write_unlock_irq(&snd_pcm_link_rwlock); 1619 up_write(&snd_pcm_link_rwsem); 1620 fput(file); 1621 return res; 1622 } 1623 1624 static void relink_to_local(struct snd_pcm_substream *substream) 1625 { 1626 substream->group = &substream->self_group; 1627 INIT_LIST_HEAD(&substream->self_group.substreams); 1628 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1629 } 1630 1631 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1632 { 1633 struct snd_pcm_substream *s; 1634 int res = 0; 1635 1636 down_write(&snd_pcm_link_rwsem); 1637 write_lock_irq(&snd_pcm_link_rwlock); 1638 if (!snd_pcm_stream_linked(substream)) { 1639 res = -EALREADY; 1640 goto _end; 1641 } 1642 list_del(&substream->link_list); 1643 substream->group->count--; 1644 if (substream->group->count == 1) { /* detach the last stream, too */ 1645 snd_pcm_group_for_each_entry(s, substream) { 1646 relink_to_local(s); 1647 break; 1648 } 1649 kfree(substream->group); 1650 } 1651 relink_to_local(substream); 1652 _end: 1653 write_unlock_irq(&snd_pcm_link_rwlock); 1654 up_write(&snd_pcm_link_rwsem); 1655 return res; 1656 } 1657 1658 /* 1659 * hw configurator 1660 */ 1661 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1662 struct snd_pcm_hw_rule *rule) 1663 { 1664 struct snd_interval t; 1665 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1666 hw_param_interval_c(params, rule->deps[1]), &t); 1667 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1668 } 1669 1670 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1671 struct snd_pcm_hw_rule *rule) 1672 { 1673 struct snd_interval t; 1674 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1675 hw_param_interval_c(params, rule->deps[1]), &t); 1676 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1677 } 1678 1679 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1680 struct snd_pcm_hw_rule *rule) 1681 { 1682 struct snd_interval t; 1683 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1684 hw_param_interval_c(params, rule->deps[1]), 1685 (unsigned long) rule->private, &t); 1686 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1687 } 1688 1689 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1690 struct snd_pcm_hw_rule *rule) 1691 { 1692 struct snd_interval t; 1693 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1694 (unsigned long) rule->private, 1695 hw_param_interval_c(params, rule->deps[1]), &t); 1696 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1697 } 1698 1699 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1700 struct snd_pcm_hw_rule *rule) 1701 { 1702 unsigned int k; 1703 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1704 struct snd_mask m; 1705 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1706 snd_mask_any(&m); 1707 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1708 int bits; 1709 if (! snd_mask_test(mask, k)) 1710 continue; 1711 bits = snd_pcm_format_physical_width(k); 1712 if (bits <= 0) 1713 continue; /* ignore invalid formats */ 1714 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1715 snd_mask_reset(&m, k); 1716 } 1717 return snd_mask_refine(mask, &m); 1718 } 1719 1720 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1721 struct snd_pcm_hw_rule *rule) 1722 { 1723 struct snd_interval t; 1724 unsigned int k; 1725 t.min = UINT_MAX; 1726 t.max = 0; 1727 t.openmin = 0; 1728 t.openmax = 0; 1729 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1730 int bits; 1731 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1732 continue; 1733 bits = snd_pcm_format_physical_width(k); 1734 if (bits <= 0) 1735 continue; /* ignore invalid formats */ 1736 if (t.min > (unsigned)bits) 1737 t.min = bits; 1738 if (t.max < (unsigned)bits) 1739 t.max = bits; 1740 } 1741 t.integer = 1; 1742 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1743 } 1744 1745 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1746 #error "Change this table" 1747 #endif 1748 1749 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1750 48000, 64000, 88200, 96000, 176400, 192000 }; 1751 1752 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1753 .count = ARRAY_SIZE(rates), 1754 .list = rates, 1755 }; 1756 1757 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1758 struct snd_pcm_hw_rule *rule) 1759 { 1760 struct snd_pcm_hardware *hw = rule->private; 1761 return snd_interval_list(hw_param_interval(params, rule->var), 1762 snd_pcm_known_rates.count, 1763 snd_pcm_known_rates.list, hw->rates); 1764 } 1765 1766 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1767 struct snd_pcm_hw_rule *rule) 1768 { 1769 struct snd_interval t; 1770 struct snd_pcm_substream *substream = rule->private; 1771 t.min = 0; 1772 t.max = substream->buffer_bytes_max; 1773 t.openmin = 0; 1774 t.openmax = 0; 1775 t.integer = 1; 1776 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1777 } 1778 1779 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1780 { 1781 struct snd_pcm_runtime *runtime = substream->runtime; 1782 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1783 int k, err; 1784 1785 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1786 snd_mask_any(constrs_mask(constrs, k)); 1787 } 1788 1789 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1790 snd_interval_any(constrs_interval(constrs, k)); 1791 } 1792 1793 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1794 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1795 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1796 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1797 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1798 1799 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1800 snd_pcm_hw_rule_format, NULL, 1801 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1802 if (err < 0) 1803 return err; 1804 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1805 snd_pcm_hw_rule_sample_bits, NULL, 1806 SNDRV_PCM_HW_PARAM_FORMAT, 1807 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1808 if (err < 0) 1809 return err; 1810 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1811 snd_pcm_hw_rule_div, NULL, 1812 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1813 if (err < 0) 1814 return err; 1815 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1816 snd_pcm_hw_rule_mul, NULL, 1817 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1818 if (err < 0) 1819 return err; 1820 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1821 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1822 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1823 if (err < 0) 1824 return err; 1825 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1826 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1827 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 1828 if (err < 0) 1829 return err; 1830 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1831 snd_pcm_hw_rule_div, NULL, 1832 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1833 if (err < 0) 1834 return err; 1835 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1836 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1837 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 1838 if (err < 0) 1839 return err; 1840 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1841 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1842 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 1843 if (err < 0) 1844 return err; 1845 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 1846 snd_pcm_hw_rule_div, NULL, 1847 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1848 if (err < 0) 1849 return err; 1850 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1851 snd_pcm_hw_rule_div, NULL, 1852 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1853 if (err < 0) 1854 return err; 1855 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1856 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1857 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1858 if (err < 0) 1859 return err; 1860 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1861 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1862 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1863 if (err < 0) 1864 return err; 1865 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1866 snd_pcm_hw_rule_mul, NULL, 1867 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1868 if (err < 0) 1869 return err; 1870 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1871 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1872 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1873 if (err < 0) 1874 return err; 1875 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1876 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1877 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1878 if (err < 0) 1879 return err; 1880 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1881 snd_pcm_hw_rule_muldivk, (void*) 8, 1882 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1883 if (err < 0) 1884 return err; 1885 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1886 snd_pcm_hw_rule_muldivk, (void*) 8, 1887 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1888 if (err < 0) 1889 return err; 1890 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1891 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1892 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1893 if (err < 0) 1894 return err; 1895 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 1896 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1897 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1898 if (err < 0) 1899 return err; 1900 return 0; 1901 } 1902 1903 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 1904 { 1905 struct snd_pcm_runtime *runtime = substream->runtime; 1906 struct snd_pcm_hardware *hw = &runtime->hw; 1907 int err; 1908 unsigned int mask = 0; 1909 1910 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1911 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 1912 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1913 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 1914 if (hw->info & SNDRV_PCM_INFO_MMAP) { 1915 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1916 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 1917 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1918 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 1919 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 1920 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 1921 } 1922 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 1923 if (err < 0) 1924 return err; 1925 1926 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 1927 if (err < 0) 1928 return err; 1929 1930 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 1931 if (err < 0) 1932 return err; 1933 1934 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 1935 hw->channels_min, hw->channels_max); 1936 if (err < 0) 1937 return err; 1938 1939 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 1940 hw->rate_min, hw->rate_max); 1941 if (err < 0) 1942 return err; 1943 1944 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1945 hw->period_bytes_min, hw->period_bytes_max); 1946 if (err < 0) 1947 return err; 1948 1949 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 1950 hw->periods_min, hw->periods_max); 1951 if (err < 0) 1952 return err; 1953 1954 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1955 hw->period_bytes_min, hw->buffer_bytes_max); 1956 if (err < 0) 1957 return err; 1958 1959 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1960 snd_pcm_hw_rule_buffer_bytes_max, substream, 1961 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 1962 if (err < 0) 1963 return err; 1964 1965 /* FIXME: remove */ 1966 if (runtime->dma_bytes) { 1967 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 1968 if (err < 0) 1969 return -EINVAL; 1970 } 1971 1972 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 1973 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1974 snd_pcm_hw_rule_rate, hw, 1975 SNDRV_PCM_HW_PARAM_RATE, -1); 1976 if (err < 0) 1977 return err; 1978 } 1979 1980 /* FIXME: this belong to lowlevel */ 1981 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 1982 1983 return 0; 1984 } 1985 1986 static void pcm_release_private(struct snd_pcm_substream *substream) 1987 { 1988 snd_pcm_unlink(substream); 1989 } 1990 1991 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 1992 { 1993 substream->ref_count--; 1994 if (substream->ref_count > 0) 1995 return; 1996 1997 snd_pcm_drop(substream); 1998 if (substream->hw_opened) { 1999 if (substream->ops->hw_free != NULL) 2000 substream->ops->hw_free(substream); 2001 substream->ops->close(substream); 2002 substream->hw_opened = 0; 2003 } 2004 if (substream->pcm_release) { 2005 substream->pcm_release(substream); 2006 substream->pcm_release = NULL; 2007 } 2008 snd_pcm_detach_substream(substream); 2009 } 2010 2011 EXPORT_SYMBOL(snd_pcm_release_substream); 2012 2013 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2014 struct file *file, 2015 struct snd_pcm_substream **rsubstream) 2016 { 2017 struct snd_pcm_substream *substream; 2018 int err; 2019 2020 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2021 if (err < 0) 2022 return err; 2023 if (substream->ref_count > 1) { 2024 *rsubstream = substream; 2025 return 0; 2026 } 2027 2028 err = snd_pcm_hw_constraints_init(substream); 2029 if (err < 0) { 2030 snd_printd("snd_pcm_hw_constraints_init failed\n"); 2031 goto error; 2032 } 2033 2034 if ((err = substream->ops->open(substream)) < 0) 2035 goto error; 2036 2037 substream->hw_opened = 1; 2038 2039 err = snd_pcm_hw_constraints_complete(substream); 2040 if (err < 0) { 2041 snd_printd("snd_pcm_hw_constraints_complete failed\n"); 2042 goto error; 2043 } 2044 2045 *rsubstream = substream; 2046 return 0; 2047 2048 error: 2049 snd_pcm_release_substream(substream); 2050 return err; 2051 } 2052 2053 EXPORT_SYMBOL(snd_pcm_open_substream); 2054 2055 static int snd_pcm_open_file(struct file *file, 2056 struct snd_pcm *pcm, 2057 int stream, 2058 struct snd_pcm_file **rpcm_file) 2059 { 2060 struct snd_pcm_file *pcm_file; 2061 struct snd_pcm_substream *substream; 2062 struct snd_pcm_str *str; 2063 int err; 2064 2065 if (rpcm_file) 2066 *rpcm_file = NULL; 2067 2068 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2069 if (err < 0) 2070 return err; 2071 2072 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2073 if (pcm_file == NULL) { 2074 snd_pcm_release_substream(substream); 2075 return -ENOMEM; 2076 } 2077 pcm_file->substream = substream; 2078 if (substream->ref_count == 1) { 2079 str = substream->pstr; 2080 substream->file = pcm_file; 2081 substream->pcm_release = pcm_release_private; 2082 } 2083 file->private_data = pcm_file; 2084 if (rpcm_file) 2085 *rpcm_file = pcm_file; 2086 return 0; 2087 } 2088 2089 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2090 { 2091 struct snd_pcm *pcm; 2092 2093 pcm = snd_lookup_minor_data(iminor(inode), 2094 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2095 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2096 } 2097 2098 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2099 { 2100 struct snd_pcm *pcm; 2101 2102 pcm = snd_lookup_minor_data(iminor(inode), 2103 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2104 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2105 } 2106 2107 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2108 { 2109 int err; 2110 struct snd_pcm_file *pcm_file; 2111 wait_queue_t wait; 2112 2113 if (pcm == NULL) { 2114 err = -ENODEV; 2115 goto __error1; 2116 } 2117 err = snd_card_file_add(pcm->card, file); 2118 if (err < 0) 2119 goto __error1; 2120 if (!try_module_get(pcm->card->module)) { 2121 err = -EFAULT; 2122 goto __error2; 2123 } 2124 init_waitqueue_entry(&wait, current); 2125 add_wait_queue(&pcm->open_wait, &wait); 2126 mutex_lock(&pcm->open_mutex); 2127 while (1) { 2128 err = snd_pcm_open_file(file, pcm, stream, &pcm_file); 2129 if (err >= 0) 2130 break; 2131 if (err == -EAGAIN) { 2132 if (file->f_flags & O_NONBLOCK) { 2133 err = -EBUSY; 2134 break; 2135 } 2136 } else 2137 break; 2138 set_current_state(TASK_INTERRUPTIBLE); 2139 mutex_unlock(&pcm->open_mutex); 2140 schedule(); 2141 mutex_lock(&pcm->open_mutex); 2142 if (signal_pending(current)) { 2143 err = -ERESTARTSYS; 2144 break; 2145 } 2146 } 2147 remove_wait_queue(&pcm->open_wait, &wait); 2148 mutex_unlock(&pcm->open_mutex); 2149 if (err < 0) 2150 goto __error; 2151 return err; 2152 2153 __error: 2154 module_put(pcm->card->module); 2155 __error2: 2156 snd_card_file_remove(pcm->card, file); 2157 __error1: 2158 return err; 2159 } 2160 2161 static int snd_pcm_release(struct inode *inode, struct file *file) 2162 { 2163 struct snd_pcm *pcm; 2164 struct snd_pcm_substream *substream; 2165 struct snd_pcm_file *pcm_file; 2166 2167 pcm_file = file->private_data; 2168 substream = pcm_file->substream; 2169 if (snd_BUG_ON(!substream)) 2170 return -ENXIO; 2171 pcm = substream->pcm; 2172 fasync_helper(-1, file, 0, &substream->runtime->fasync); 2173 mutex_lock(&pcm->open_mutex); 2174 snd_pcm_release_substream(substream); 2175 kfree(pcm_file); 2176 mutex_unlock(&pcm->open_mutex); 2177 wake_up(&pcm->open_wait); 2178 module_put(pcm->card->module); 2179 snd_card_file_remove(pcm->card, file); 2180 return 0; 2181 } 2182 2183 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2184 snd_pcm_uframes_t frames) 2185 { 2186 struct snd_pcm_runtime *runtime = substream->runtime; 2187 snd_pcm_sframes_t appl_ptr; 2188 snd_pcm_sframes_t ret; 2189 snd_pcm_sframes_t hw_avail; 2190 2191 if (frames == 0) 2192 return 0; 2193 2194 snd_pcm_stream_lock_irq(substream); 2195 switch (runtime->status->state) { 2196 case SNDRV_PCM_STATE_PREPARED: 2197 break; 2198 case SNDRV_PCM_STATE_DRAINING: 2199 case SNDRV_PCM_STATE_RUNNING: 2200 if (snd_pcm_update_hw_ptr(substream) >= 0) 2201 break; 2202 /* Fall through */ 2203 case SNDRV_PCM_STATE_XRUN: 2204 ret = -EPIPE; 2205 goto __end; 2206 default: 2207 ret = -EBADFD; 2208 goto __end; 2209 } 2210 2211 hw_avail = snd_pcm_playback_hw_avail(runtime); 2212 if (hw_avail <= 0) { 2213 ret = 0; 2214 goto __end; 2215 } 2216 if (frames > (snd_pcm_uframes_t)hw_avail) 2217 frames = hw_avail; 2218 appl_ptr = runtime->control->appl_ptr - frames; 2219 if (appl_ptr < 0) 2220 appl_ptr += runtime->boundary; 2221 runtime->control->appl_ptr = appl_ptr; 2222 ret = frames; 2223 __end: 2224 snd_pcm_stream_unlock_irq(substream); 2225 return ret; 2226 } 2227 2228 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2229 snd_pcm_uframes_t frames) 2230 { 2231 struct snd_pcm_runtime *runtime = substream->runtime; 2232 snd_pcm_sframes_t appl_ptr; 2233 snd_pcm_sframes_t ret; 2234 snd_pcm_sframes_t hw_avail; 2235 2236 if (frames == 0) 2237 return 0; 2238 2239 snd_pcm_stream_lock_irq(substream); 2240 switch (runtime->status->state) { 2241 case SNDRV_PCM_STATE_PREPARED: 2242 case SNDRV_PCM_STATE_DRAINING: 2243 break; 2244 case SNDRV_PCM_STATE_RUNNING: 2245 if (snd_pcm_update_hw_ptr(substream) >= 0) 2246 break; 2247 /* Fall through */ 2248 case SNDRV_PCM_STATE_XRUN: 2249 ret = -EPIPE; 2250 goto __end; 2251 default: 2252 ret = -EBADFD; 2253 goto __end; 2254 } 2255 2256 hw_avail = snd_pcm_capture_hw_avail(runtime); 2257 if (hw_avail <= 0) { 2258 ret = 0; 2259 goto __end; 2260 } 2261 if (frames > (snd_pcm_uframes_t)hw_avail) 2262 frames = hw_avail; 2263 appl_ptr = runtime->control->appl_ptr - frames; 2264 if (appl_ptr < 0) 2265 appl_ptr += runtime->boundary; 2266 runtime->control->appl_ptr = appl_ptr; 2267 ret = frames; 2268 __end: 2269 snd_pcm_stream_unlock_irq(substream); 2270 return ret; 2271 } 2272 2273 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2274 snd_pcm_uframes_t frames) 2275 { 2276 struct snd_pcm_runtime *runtime = substream->runtime; 2277 snd_pcm_sframes_t appl_ptr; 2278 snd_pcm_sframes_t ret; 2279 snd_pcm_sframes_t avail; 2280 2281 if (frames == 0) 2282 return 0; 2283 2284 snd_pcm_stream_lock_irq(substream); 2285 switch (runtime->status->state) { 2286 case SNDRV_PCM_STATE_PREPARED: 2287 case SNDRV_PCM_STATE_PAUSED: 2288 break; 2289 case SNDRV_PCM_STATE_DRAINING: 2290 case SNDRV_PCM_STATE_RUNNING: 2291 if (snd_pcm_update_hw_ptr(substream) >= 0) 2292 break; 2293 /* Fall through */ 2294 case SNDRV_PCM_STATE_XRUN: 2295 ret = -EPIPE; 2296 goto __end; 2297 default: 2298 ret = -EBADFD; 2299 goto __end; 2300 } 2301 2302 avail = snd_pcm_playback_avail(runtime); 2303 if (avail <= 0) { 2304 ret = 0; 2305 goto __end; 2306 } 2307 if (frames > (snd_pcm_uframes_t)avail) 2308 frames = avail; 2309 appl_ptr = runtime->control->appl_ptr + frames; 2310 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2311 appl_ptr -= runtime->boundary; 2312 runtime->control->appl_ptr = appl_ptr; 2313 ret = frames; 2314 __end: 2315 snd_pcm_stream_unlock_irq(substream); 2316 return ret; 2317 } 2318 2319 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2320 snd_pcm_uframes_t frames) 2321 { 2322 struct snd_pcm_runtime *runtime = substream->runtime; 2323 snd_pcm_sframes_t appl_ptr; 2324 snd_pcm_sframes_t ret; 2325 snd_pcm_sframes_t avail; 2326 2327 if (frames == 0) 2328 return 0; 2329 2330 snd_pcm_stream_lock_irq(substream); 2331 switch (runtime->status->state) { 2332 case SNDRV_PCM_STATE_PREPARED: 2333 case SNDRV_PCM_STATE_DRAINING: 2334 case SNDRV_PCM_STATE_PAUSED: 2335 break; 2336 case SNDRV_PCM_STATE_RUNNING: 2337 if (snd_pcm_update_hw_ptr(substream) >= 0) 2338 break; 2339 /* Fall through */ 2340 case SNDRV_PCM_STATE_XRUN: 2341 ret = -EPIPE; 2342 goto __end; 2343 default: 2344 ret = -EBADFD; 2345 goto __end; 2346 } 2347 2348 avail = snd_pcm_capture_avail(runtime); 2349 if (avail <= 0) { 2350 ret = 0; 2351 goto __end; 2352 } 2353 if (frames > (snd_pcm_uframes_t)avail) 2354 frames = avail; 2355 appl_ptr = runtime->control->appl_ptr + frames; 2356 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2357 appl_ptr -= runtime->boundary; 2358 runtime->control->appl_ptr = appl_ptr; 2359 ret = frames; 2360 __end: 2361 snd_pcm_stream_unlock_irq(substream); 2362 return ret; 2363 } 2364 2365 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2366 { 2367 struct snd_pcm_runtime *runtime = substream->runtime; 2368 int err; 2369 2370 snd_pcm_stream_lock_irq(substream); 2371 switch (runtime->status->state) { 2372 case SNDRV_PCM_STATE_DRAINING: 2373 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2374 goto __badfd; 2375 case SNDRV_PCM_STATE_RUNNING: 2376 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2377 break; 2378 /* Fall through */ 2379 case SNDRV_PCM_STATE_PREPARED: 2380 case SNDRV_PCM_STATE_SUSPENDED: 2381 err = 0; 2382 break; 2383 case SNDRV_PCM_STATE_XRUN: 2384 err = -EPIPE; 2385 break; 2386 default: 2387 __badfd: 2388 err = -EBADFD; 2389 break; 2390 } 2391 snd_pcm_stream_unlock_irq(substream); 2392 return err; 2393 } 2394 2395 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2396 snd_pcm_sframes_t __user *res) 2397 { 2398 struct snd_pcm_runtime *runtime = substream->runtime; 2399 int err; 2400 snd_pcm_sframes_t n = 0; 2401 2402 snd_pcm_stream_lock_irq(substream); 2403 switch (runtime->status->state) { 2404 case SNDRV_PCM_STATE_DRAINING: 2405 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2406 goto __badfd; 2407 case SNDRV_PCM_STATE_RUNNING: 2408 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2409 break; 2410 /* Fall through */ 2411 case SNDRV_PCM_STATE_PREPARED: 2412 case SNDRV_PCM_STATE_SUSPENDED: 2413 err = 0; 2414 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2415 n = snd_pcm_playback_hw_avail(runtime); 2416 else 2417 n = snd_pcm_capture_avail(runtime); 2418 break; 2419 case SNDRV_PCM_STATE_XRUN: 2420 err = -EPIPE; 2421 break; 2422 default: 2423 __badfd: 2424 err = -EBADFD; 2425 break; 2426 } 2427 snd_pcm_stream_unlock_irq(substream); 2428 if (!err) 2429 if (put_user(n, res)) 2430 err = -EFAULT; 2431 return err; 2432 } 2433 2434 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2435 struct snd_pcm_sync_ptr __user *_sync_ptr) 2436 { 2437 struct snd_pcm_runtime *runtime = substream->runtime; 2438 struct snd_pcm_sync_ptr sync_ptr; 2439 volatile struct snd_pcm_mmap_status *status; 2440 volatile struct snd_pcm_mmap_control *control; 2441 int err; 2442 2443 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2444 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2445 return -EFAULT; 2446 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2447 return -EFAULT; 2448 status = runtime->status; 2449 control = runtime->control; 2450 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2451 err = snd_pcm_hwsync(substream); 2452 if (err < 0) 2453 return err; 2454 } 2455 snd_pcm_stream_lock_irq(substream); 2456 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2457 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2458 else 2459 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2460 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2461 control->avail_min = sync_ptr.c.control.avail_min; 2462 else 2463 sync_ptr.c.control.avail_min = control->avail_min; 2464 sync_ptr.s.status.state = status->state; 2465 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2466 sync_ptr.s.status.tstamp = status->tstamp; 2467 sync_ptr.s.status.suspended_state = status->suspended_state; 2468 snd_pcm_stream_unlock_irq(substream); 2469 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2470 return -EFAULT; 2471 return 0; 2472 } 2473 2474 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2475 { 2476 struct snd_pcm_runtime *runtime = substream->runtime; 2477 int arg; 2478 2479 if (get_user(arg, _arg)) 2480 return -EFAULT; 2481 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2482 return -EINVAL; 2483 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY; 2484 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 2485 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC; 2486 return 0; 2487 } 2488 2489 static int snd_pcm_common_ioctl1(struct file *file, 2490 struct snd_pcm_substream *substream, 2491 unsigned int cmd, void __user *arg) 2492 { 2493 switch (cmd) { 2494 case SNDRV_PCM_IOCTL_PVERSION: 2495 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2496 case SNDRV_PCM_IOCTL_INFO: 2497 return snd_pcm_info_user(substream, arg); 2498 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2499 return 0; 2500 case SNDRV_PCM_IOCTL_TTSTAMP: 2501 return snd_pcm_tstamp(substream, arg); 2502 case SNDRV_PCM_IOCTL_HW_REFINE: 2503 return snd_pcm_hw_refine_user(substream, arg); 2504 case SNDRV_PCM_IOCTL_HW_PARAMS: 2505 return snd_pcm_hw_params_user(substream, arg); 2506 case SNDRV_PCM_IOCTL_HW_FREE: 2507 return snd_pcm_hw_free(substream); 2508 case SNDRV_PCM_IOCTL_SW_PARAMS: 2509 return snd_pcm_sw_params_user(substream, arg); 2510 case SNDRV_PCM_IOCTL_STATUS: 2511 return snd_pcm_status_user(substream, arg); 2512 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2513 return snd_pcm_channel_info_user(substream, arg); 2514 case SNDRV_PCM_IOCTL_PREPARE: 2515 return snd_pcm_prepare(substream, file); 2516 case SNDRV_PCM_IOCTL_RESET: 2517 return snd_pcm_reset(substream); 2518 case SNDRV_PCM_IOCTL_START: 2519 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2520 case SNDRV_PCM_IOCTL_LINK: 2521 return snd_pcm_link(substream, (int)(unsigned long) arg); 2522 case SNDRV_PCM_IOCTL_UNLINK: 2523 return snd_pcm_unlink(substream); 2524 case SNDRV_PCM_IOCTL_RESUME: 2525 return snd_pcm_resume(substream); 2526 case SNDRV_PCM_IOCTL_XRUN: 2527 return snd_pcm_xrun(substream); 2528 case SNDRV_PCM_IOCTL_HWSYNC: 2529 return snd_pcm_hwsync(substream); 2530 case SNDRV_PCM_IOCTL_DELAY: 2531 return snd_pcm_delay(substream, arg); 2532 case SNDRV_PCM_IOCTL_SYNC_PTR: 2533 return snd_pcm_sync_ptr(substream, arg); 2534 #ifdef CONFIG_SND_SUPPORT_OLD_API 2535 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2536 return snd_pcm_hw_refine_old_user(substream, arg); 2537 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2538 return snd_pcm_hw_params_old_user(substream, arg); 2539 #endif 2540 case SNDRV_PCM_IOCTL_DRAIN: 2541 return snd_pcm_drain(substream); 2542 case SNDRV_PCM_IOCTL_DROP: 2543 return snd_pcm_drop(substream); 2544 case SNDRV_PCM_IOCTL_PAUSE: 2545 { 2546 int res; 2547 snd_pcm_stream_lock_irq(substream); 2548 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2549 snd_pcm_stream_unlock_irq(substream); 2550 return res; 2551 } 2552 } 2553 snd_printd("unknown ioctl = 0x%x\n", cmd); 2554 return -ENOTTY; 2555 } 2556 2557 static int snd_pcm_playback_ioctl1(struct file *file, 2558 struct snd_pcm_substream *substream, 2559 unsigned int cmd, void __user *arg) 2560 { 2561 if (snd_BUG_ON(!substream)) 2562 return -ENXIO; 2563 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2564 return -EINVAL; 2565 switch (cmd) { 2566 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2567 { 2568 struct snd_xferi xferi; 2569 struct snd_xferi __user *_xferi = arg; 2570 struct snd_pcm_runtime *runtime = substream->runtime; 2571 snd_pcm_sframes_t result; 2572 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2573 return -EBADFD; 2574 if (put_user(0, &_xferi->result)) 2575 return -EFAULT; 2576 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2577 return -EFAULT; 2578 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2579 __put_user(result, &_xferi->result); 2580 return result < 0 ? result : 0; 2581 } 2582 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2583 { 2584 struct snd_xfern xfern; 2585 struct snd_xfern __user *_xfern = arg; 2586 struct snd_pcm_runtime *runtime = substream->runtime; 2587 void __user **bufs; 2588 snd_pcm_sframes_t result; 2589 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2590 return -EBADFD; 2591 if (runtime->channels > 128) 2592 return -EINVAL; 2593 if (put_user(0, &_xfern->result)) 2594 return -EFAULT; 2595 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2596 return -EFAULT; 2597 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL); 2598 if (bufs == NULL) 2599 return -ENOMEM; 2600 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) { 2601 kfree(bufs); 2602 return -EFAULT; 2603 } 2604 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2605 kfree(bufs); 2606 __put_user(result, &_xfern->result); 2607 return result < 0 ? result : 0; 2608 } 2609 case SNDRV_PCM_IOCTL_REWIND: 2610 { 2611 snd_pcm_uframes_t frames; 2612 snd_pcm_uframes_t __user *_frames = arg; 2613 snd_pcm_sframes_t result; 2614 if (get_user(frames, _frames)) 2615 return -EFAULT; 2616 if (put_user(0, _frames)) 2617 return -EFAULT; 2618 result = snd_pcm_playback_rewind(substream, frames); 2619 __put_user(result, _frames); 2620 return result < 0 ? result : 0; 2621 } 2622 case SNDRV_PCM_IOCTL_FORWARD: 2623 { 2624 snd_pcm_uframes_t frames; 2625 snd_pcm_uframes_t __user *_frames = arg; 2626 snd_pcm_sframes_t result; 2627 if (get_user(frames, _frames)) 2628 return -EFAULT; 2629 if (put_user(0, _frames)) 2630 return -EFAULT; 2631 result = snd_pcm_playback_forward(substream, frames); 2632 __put_user(result, _frames); 2633 return result < 0 ? result : 0; 2634 } 2635 } 2636 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2637 } 2638 2639 static int snd_pcm_capture_ioctl1(struct file *file, 2640 struct snd_pcm_substream *substream, 2641 unsigned int cmd, void __user *arg) 2642 { 2643 if (snd_BUG_ON(!substream)) 2644 return -ENXIO; 2645 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2646 return -EINVAL; 2647 switch (cmd) { 2648 case SNDRV_PCM_IOCTL_READI_FRAMES: 2649 { 2650 struct snd_xferi xferi; 2651 struct snd_xferi __user *_xferi = arg; 2652 struct snd_pcm_runtime *runtime = substream->runtime; 2653 snd_pcm_sframes_t result; 2654 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2655 return -EBADFD; 2656 if (put_user(0, &_xferi->result)) 2657 return -EFAULT; 2658 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2659 return -EFAULT; 2660 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2661 __put_user(result, &_xferi->result); 2662 return result < 0 ? result : 0; 2663 } 2664 case SNDRV_PCM_IOCTL_READN_FRAMES: 2665 { 2666 struct snd_xfern xfern; 2667 struct snd_xfern __user *_xfern = arg; 2668 struct snd_pcm_runtime *runtime = substream->runtime; 2669 void *bufs; 2670 snd_pcm_sframes_t result; 2671 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2672 return -EBADFD; 2673 if (runtime->channels > 128) 2674 return -EINVAL; 2675 if (put_user(0, &_xfern->result)) 2676 return -EFAULT; 2677 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2678 return -EFAULT; 2679 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL); 2680 if (bufs == NULL) 2681 return -ENOMEM; 2682 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) { 2683 kfree(bufs); 2684 return -EFAULT; 2685 } 2686 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2687 kfree(bufs); 2688 __put_user(result, &_xfern->result); 2689 return result < 0 ? result : 0; 2690 } 2691 case SNDRV_PCM_IOCTL_REWIND: 2692 { 2693 snd_pcm_uframes_t frames; 2694 snd_pcm_uframes_t __user *_frames = arg; 2695 snd_pcm_sframes_t result; 2696 if (get_user(frames, _frames)) 2697 return -EFAULT; 2698 if (put_user(0, _frames)) 2699 return -EFAULT; 2700 result = snd_pcm_capture_rewind(substream, frames); 2701 __put_user(result, _frames); 2702 return result < 0 ? result : 0; 2703 } 2704 case SNDRV_PCM_IOCTL_FORWARD: 2705 { 2706 snd_pcm_uframes_t frames; 2707 snd_pcm_uframes_t __user *_frames = arg; 2708 snd_pcm_sframes_t result; 2709 if (get_user(frames, _frames)) 2710 return -EFAULT; 2711 if (put_user(0, _frames)) 2712 return -EFAULT; 2713 result = snd_pcm_capture_forward(substream, frames); 2714 __put_user(result, _frames); 2715 return result < 0 ? result : 0; 2716 } 2717 } 2718 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2719 } 2720 2721 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2722 unsigned long arg) 2723 { 2724 struct snd_pcm_file *pcm_file; 2725 2726 pcm_file = file->private_data; 2727 2728 if (((cmd >> 8) & 0xff) != 'A') 2729 return -ENOTTY; 2730 2731 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2732 (void __user *)arg); 2733 } 2734 2735 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2736 unsigned long arg) 2737 { 2738 struct snd_pcm_file *pcm_file; 2739 2740 pcm_file = file->private_data; 2741 2742 if (((cmd >> 8) & 0xff) != 'A') 2743 return -ENOTTY; 2744 2745 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2746 (void __user *)arg); 2747 } 2748 2749 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2750 unsigned int cmd, void *arg) 2751 { 2752 mm_segment_t fs; 2753 int result; 2754 2755 fs = snd_enter_user(); 2756 switch (substream->stream) { 2757 case SNDRV_PCM_STREAM_PLAYBACK: 2758 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2759 (void __user *)arg); 2760 break; 2761 case SNDRV_PCM_STREAM_CAPTURE: 2762 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2763 (void __user *)arg); 2764 break; 2765 default: 2766 result = -EINVAL; 2767 break; 2768 } 2769 snd_leave_user(fs); 2770 return result; 2771 } 2772 2773 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2774 2775 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2776 loff_t * offset) 2777 { 2778 struct snd_pcm_file *pcm_file; 2779 struct snd_pcm_substream *substream; 2780 struct snd_pcm_runtime *runtime; 2781 snd_pcm_sframes_t result; 2782 2783 pcm_file = file->private_data; 2784 substream = pcm_file->substream; 2785 if (PCM_RUNTIME_CHECK(substream)) 2786 return -ENXIO; 2787 runtime = substream->runtime; 2788 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2789 return -EBADFD; 2790 if (!frame_aligned(runtime, count)) 2791 return -EINVAL; 2792 count = bytes_to_frames(runtime, count); 2793 result = snd_pcm_lib_read(substream, buf, count); 2794 if (result > 0) 2795 result = frames_to_bytes(runtime, result); 2796 return result; 2797 } 2798 2799 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2800 size_t count, loff_t * offset) 2801 { 2802 struct snd_pcm_file *pcm_file; 2803 struct snd_pcm_substream *substream; 2804 struct snd_pcm_runtime *runtime; 2805 snd_pcm_sframes_t result; 2806 2807 pcm_file = file->private_data; 2808 substream = pcm_file->substream; 2809 if (PCM_RUNTIME_CHECK(substream)) 2810 return -ENXIO; 2811 runtime = substream->runtime; 2812 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2813 return -EBADFD; 2814 if (!frame_aligned(runtime, count)) 2815 return -EINVAL; 2816 count = bytes_to_frames(runtime, count); 2817 result = snd_pcm_lib_write(substream, buf, count); 2818 if (result > 0) 2819 result = frames_to_bytes(runtime, result); 2820 return result; 2821 } 2822 2823 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 2824 unsigned long nr_segs, loff_t pos) 2825 2826 { 2827 struct snd_pcm_file *pcm_file; 2828 struct snd_pcm_substream *substream; 2829 struct snd_pcm_runtime *runtime; 2830 snd_pcm_sframes_t result; 2831 unsigned long i; 2832 void __user **bufs; 2833 snd_pcm_uframes_t frames; 2834 2835 pcm_file = iocb->ki_filp->private_data; 2836 substream = pcm_file->substream; 2837 if (PCM_RUNTIME_CHECK(substream)) 2838 return -ENXIO; 2839 runtime = substream->runtime; 2840 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2841 return -EBADFD; 2842 if (nr_segs > 1024 || nr_segs != runtime->channels) 2843 return -EINVAL; 2844 if (!frame_aligned(runtime, iov->iov_len)) 2845 return -EINVAL; 2846 frames = bytes_to_samples(runtime, iov->iov_len); 2847 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2848 if (bufs == NULL) 2849 return -ENOMEM; 2850 for (i = 0; i < nr_segs; ++i) 2851 bufs[i] = iov[i].iov_base; 2852 result = snd_pcm_lib_readv(substream, bufs, frames); 2853 if (result > 0) 2854 result = frames_to_bytes(runtime, result); 2855 kfree(bufs); 2856 return result; 2857 } 2858 2859 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 2860 unsigned long nr_segs, loff_t pos) 2861 { 2862 struct snd_pcm_file *pcm_file; 2863 struct snd_pcm_substream *substream; 2864 struct snd_pcm_runtime *runtime; 2865 snd_pcm_sframes_t result; 2866 unsigned long i; 2867 void __user **bufs; 2868 snd_pcm_uframes_t frames; 2869 2870 pcm_file = iocb->ki_filp->private_data; 2871 substream = pcm_file->substream; 2872 if (PCM_RUNTIME_CHECK(substream)) 2873 return -ENXIO; 2874 runtime = substream->runtime; 2875 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2876 return -EBADFD; 2877 if (nr_segs > 128 || nr_segs != runtime->channels || 2878 !frame_aligned(runtime, iov->iov_len)) 2879 return -EINVAL; 2880 frames = bytes_to_samples(runtime, iov->iov_len); 2881 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2882 if (bufs == NULL) 2883 return -ENOMEM; 2884 for (i = 0; i < nr_segs; ++i) 2885 bufs[i] = iov[i].iov_base; 2886 result = snd_pcm_lib_writev(substream, bufs, frames); 2887 if (result > 0) 2888 result = frames_to_bytes(runtime, result); 2889 kfree(bufs); 2890 return result; 2891 } 2892 2893 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 2894 { 2895 struct snd_pcm_file *pcm_file; 2896 struct snd_pcm_substream *substream; 2897 struct snd_pcm_runtime *runtime; 2898 unsigned int mask; 2899 snd_pcm_uframes_t avail; 2900 2901 pcm_file = file->private_data; 2902 2903 substream = pcm_file->substream; 2904 if (PCM_RUNTIME_CHECK(substream)) 2905 return -ENXIO; 2906 runtime = substream->runtime; 2907 2908 poll_wait(file, &runtime->sleep, wait); 2909 2910 snd_pcm_stream_lock_irq(substream); 2911 avail = snd_pcm_playback_avail(runtime); 2912 switch (runtime->status->state) { 2913 case SNDRV_PCM_STATE_RUNNING: 2914 case SNDRV_PCM_STATE_PREPARED: 2915 case SNDRV_PCM_STATE_PAUSED: 2916 if (avail >= runtime->control->avail_min) { 2917 mask = POLLOUT | POLLWRNORM; 2918 break; 2919 } 2920 /* Fall through */ 2921 case SNDRV_PCM_STATE_DRAINING: 2922 mask = 0; 2923 break; 2924 default: 2925 mask = POLLOUT | POLLWRNORM | POLLERR; 2926 break; 2927 } 2928 snd_pcm_stream_unlock_irq(substream); 2929 return mask; 2930 } 2931 2932 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 2933 { 2934 struct snd_pcm_file *pcm_file; 2935 struct snd_pcm_substream *substream; 2936 struct snd_pcm_runtime *runtime; 2937 unsigned int mask; 2938 snd_pcm_uframes_t avail; 2939 2940 pcm_file = file->private_data; 2941 2942 substream = pcm_file->substream; 2943 if (PCM_RUNTIME_CHECK(substream)) 2944 return -ENXIO; 2945 runtime = substream->runtime; 2946 2947 poll_wait(file, &runtime->sleep, wait); 2948 2949 snd_pcm_stream_lock_irq(substream); 2950 avail = snd_pcm_capture_avail(runtime); 2951 switch (runtime->status->state) { 2952 case SNDRV_PCM_STATE_RUNNING: 2953 case SNDRV_PCM_STATE_PREPARED: 2954 case SNDRV_PCM_STATE_PAUSED: 2955 if (avail >= runtime->control->avail_min) { 2956 mask = POLLIN | POLLRDNORM; 2957 break; 2958 } 2959 mask = 0; 2960 break; 2961 case SNDRV_PCM_STATE_DRAINING: 2962 if (avail > 0) { 2963 mask = POLLIN | POLLRDNORM; 2964 break; 2965 } 2966 /* Fall through */ 2967 default: 2968 mask = POLLIN | POLLRDNORM | POLLERR; 2969 break; 2970 } 2971 snd_pcm_stream_unlock_irq(substream); 2972 return mask; 2973 } 2974 2975 /* 2976 * mmap support 2977 */ 2978 2979 /* 2980 * Only on coherent architectures, we can mmap the status and the control records 2981 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 2982 */ 2983 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 2984 /* 2985 * mmap status record 2986 */ 2987 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 2988 struct vm_fault *vmf) 2989 { 2990 struct snd_pcm_substream *substream = area->vm_private_data; 2991 struct snd_pcm_runtime *runtime; 2992 2993 if (substream == NULL) 2994 return VM_FAULT_SIGBUS; 2995 runtime = substream->runtime; 2996 vmf->page = virt_to_page(runtime->status); 2997 get_page(vmf->page); 2998 return 0; 2999 } 3000 3001 static struct vm_operations_struct snd_pcm_vm_ops_status = 3002 { 3003 .fault = snd_pcm_mmap_status_fault, 3004 }; 3005 3006 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3007 struct vm_area_struct *area) 3008 { 3009 struct snd_pcm_runtime *runtime; 3010 long size; 3011 if (!(area->vm_flags & VM_READ)) 3012 return -EINVAL; 3013 runtime = substream->runtime; 3014 size = area->vm_end - area->vm_start; 3015 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3016 return -EINVAL; 3017 area->vm_ops = &snd_pcm_vm_ops_status; 3018 area->vm_private_data = substream; 3019 area->vm_flags |= VM_RESERVED; 3020 return 0; 3021 } 3022 3023 /* 3024 * mmap control record 3025 */ 3026 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3027 struct vm_fault *vmf) 3028 { 3029 struct snd_pcm_substream *substream = area->vm_private_data; 3030 struct snd_pcm_runtime *runtime; 3031 3032 if (substream == NULL) 3033 return VM_FAULT_SIGBUS; 3034 runtime = substream->runtime; 3035 vmf->page = virt_to_page(runtime->control); 3036 get_page(vmf->page); 3037 return 0; 3038 } 3039 3040 static struct vm_operations_struct snd_pcm_vm_ops_control = 3041 { 3042 .fault = snd_pcm_mmap_control_fault, 3043 }; 3044 3045 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3046 struct vm_area_struct *area) 3047 { 3048 struct snd_pcm_runtime *runtime; 3049 long size; 3050 if (!(area->vm_flags & VM_READ)) 3051 return -EINVAL; 3052 runtime = substream->runtime; 3053 size = area->vm_end - area->vm_start; 3054 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3055 return -EINVAL; 3056 area->vm_ops = &snd_pcm_vm_ops_control; 3057 area->vm_private_data = substream; 3058 area->vm_flags |= VM_RESERVED; 3059 return 0; 3060 } 3061 #else /* ! coherent mmap */ 3062 /* 3063 * don't support mmap for status and control records. 3064 */ 3065 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3066 struct vm_area_struct *area) 3067 { 3068 return -ENXIO; 3069 } 3070 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3071 struct vm_area_struct *area) 3072 { 3073 return -ENXIO; 3074 } 3075 #endif /* coherent mmap */ 3076 3077 /* 3078 * fault callback for mmapping a RAM page 3079 */ 3080 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3081 struct vm_fault *vmf) 3082 { 3083 struct snd_pcm_substream *substream = area->vm_private_data; 3084 struct snd_pcm_runtime *runtime; 3085 unsigned long offset; 3086 struct page * page; 3087 void *vaddr; 3088 size_t dma_bytes; 3089 3090 if (substream == NULL) 3091 return VM_FAULT_SIGBUS; 3092 runtime = substream->runtime; 3093 offset = vmf->pgoff << PAGE_SHIFT; 3094 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3095 if (offset > dma_bytes - PAGE_SIZE) 3096 return VM_FAULT_SIGBUS; 3097 if (substream->ops->page) { 3098 page = substream->ops->page(substream, offset); 3099 if (!page) 3100 return VM_FAULT_SIGBUS; 3101 } else { 3102 vaddr = runtime->dma_area + offset; 3103 page = virt_to_page(vaddr); 3104 } 3105 get_page(page); 3106 vmf->page = page; 3107 return 0; 3108 } 3109 3110 static struct vm_operations_struct snd_pcm_vm_ops_data = 3111 { 3112 .open = snd_pcm_mmap_data_open, 3113 .close = snd_pcm_mmap_data_close, 3114 .fault = snd_pcm_mmap_data_fault, 3115 }; 3116 3117 /* 3118 * mmap the DMA buffer on RAM 3119 */ 3120 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream, 3121 struct vm_area_struct *area) 3122 { 3123 area->vm_ops = &snd_pcm_vm_ops_data; 3124 area->vm_private_data = substream; 3125 area->vm_flags |= VM_RESERVED; 3126 atomic_inc(&substream->mmap_count); 3127 return 0; 3128 } 3129 3130 /* 3131 * mmap the DMA buffer on I/O memory area 3132 */ 3133 #if SNDRV_PCM_INFO_MMAP_IOMEM 3134 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio = 3135 { 3136 .open = snd_pcm_mmap_data_open, 3137 .close = snd_pcm_mmap_data_close, 3138 }; 3139 3140 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3141 struct vm_area_struct *area) 3142 { 3143 long size; 3144 unsigned long offset; 3145 3146 #ifdef pgprot_noncached 3147 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3148 #endif 3149 area->vm_ops = &snd_pcm_vm_ops_data_mmio; 3150 area->vm_private_data = substream; 3151 area->vm_flags |= VM_IO; 3152 size = area->vm_end - area->vm_start; 3153 offset = area->vm_pgoff << PAGE_SHIFT; 3154 if (io_remap_pfn_range(area, area->vm_start, 3155 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT, 3156 size, area->vm_page_prot)) 3157 return -EAGAIN; 3158 atomic_inc(&substream->mmap_count); 3159 return 0; 3160 } 3161 3162 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3163 #endif /* SNDRV_PCM_INFO_MMAP */ 3164 3165 /* 3166 * mmap DMA buffer 3167 */ 3168 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3169 struct vm_area_struct *area) 3170 { 3171 struct snd_pcm_runtime *runtime; 3172 long size; 3173 unsigned long offset; 3174 size_t dma_bytes; 3175 3176 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3177 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3178 return -EINVAL; 3179 } else { 3180 if (!(area->vm_flags & VM_READ)) 3181 return -EINVAL; 3182 } 3183 runtime = substream->runtime; 3184 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3185 return -EBADFD; 3186 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3187 return -ENXIO; 3188 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3189 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3190 return -EINVAL; 3191 size = area->vm_end - area->vm_start; 3192 offset = area->vm_pgoff << PAGE_SHIFT; 3193 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3194 if ((size_t)size > dma_bytes) 3195 return -EINVAL; 3196 if (offset > dma_bytes - size) 3197 return -EINVAL; 3198 3199 if (substream->ops->mmap) 3200 return substream->ops->mmap(substream, area); 3201 else 3202 return snd_pcm_default_mmap(substream, area); 3203 } 3204 3205 EXPORT_SYMBOL(snd_pcm_mmap_data); 3206 3207 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3208 { 3209 struct snd_pcm_file * pcm_file; 3210 struct snd_pcm_substream *substream; 3211 unsigned long offset; 3212 3213 pcm_file = file->private_data; 3214 substream = pcm_file->substream; 3215 if (PCM_RUNTIME_CHECK(substream)) 3216 return -ENXIO; 3217 3218 offset = area->vm_pgoff << PAGE_SHIFT; 3219 switch (offset) { 3220 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3221 if (pcm_file->no_compat_mmap) 3222 return -ENXIO; 3223 return snd_pcm_mmap_status(substream, file, area); 3224 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3225 if (pcm_file->no_compat_mmap) 3226 return -ENXIO; 3227 return snd_pcm_mmap_control(substream, file, area); 3228 default: 3229 return snd_pcm_mmap_data(substream, file, area); 3230 } 3231 return 0; 3232 } 3233 3234 static int snd_pcm_fasync(int fd, struct file * file, int on) 3235 { 3236 struct snd_pcm_file * pcm_file; 3237 struct snd_pcm_substream *substream; 3238 struct snd_pcm_runtime *runtime; 3239 int err = -ENXIO; 3240 3241 lock_kernel(); 3242 pcm_file = file->private_data; 3243 substream = pcm_file->substream; 3244 if (PCM_RUNTIME_CHECK(substream)) 3245 goto out; 3246 runtime = substream->runtime; 3247 err = fasync_helper(fd, file, on, &runtime->fasync); 3248 out: 3249 unlock_kernel(); 3250 if (err < 0) 3251 return err; 3252 return 0; 3253 } 3254 3255 /* 3256 * ioctl32 compat 3257 */ 3258 #ifdef CONFIG_COMPAT 3259 #include "pcm_compat.c" 3260 #else 3261 #define snd_pcm_ioctl_compat NULL 3262 #endif 3263 3264 /* 3265 * To be removed helpers to keep binary compatibility 3266 */ 3267 3268 #ifdef CONFIG_SND_SUPPORT_OLD_API 3269 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3270 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3271 3272 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3273 struct snd_pcm_hw_params_old *oparams) 3274 { 3275 unsigned int i; 3276 3277 memset(params, 0, sizeof(*params)); 3278 params->flags = oparams->flags; 3279 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3280 params->masks[i].bits[0] = oparams->masks[i]; 3281 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3282 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3283 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3284 params->info = oparams->info; 3285 params->msbits = oparams->msbits; 3286 params->rate_num = oparams->rate_num; 3287 params->rate_den = oparams->rate_den; 3288 params->fifo_size = oparams->fifo_size; 3289 } 3290 3291 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3292 struct snd_pcm_hw_params *params) 3293 { 3294 unsigned int i; 3295 3296 memset(oparams, 0, sizeof(*oparams)); 3297 oparams->flags = params->flags; 3298 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3299 oparams->masks[i] = params->masks[i].bits[0]; 3300 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3301 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3302 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3303 oparams->info = params->info; 3304 oparams->msbits = params->msbits; 3305 oparams->rate_num = params->rate_num; 3306 oparams->rate_den = params->rate_den; 3307 oparams->fifo_size = params->fifo_size; 3308 } 3309 3310 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3311 struct snd_pcm_hw_params_old __user * _oparams) 3312 { 3313 struct snd_pcm_hw_params *params; 3314 struct snd_pcm_hw_params_old *oparams = NULL; 3315 int err; 3316 3317 params = kmalloc(sizeof(*params), GFP_KERNEL); 3318 if (!params) { 3319 err = -ENOMEM; 3320 goto out; 3321 } 3322 oparams = kmalloc(sizeof(*oparams), GFP_KERNEL); 3323 if (!oparams) { 3324 err = -ENOMEM; 3325 goto out; 3326 } 3327 3328 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) { 3329 err = -EFAULT; 3330 goto out; 3331 } 3332 snd_pcm_hw_convert_from_old_params(params, oparams); 3333 err = snd_pcm_hw_refine(substream, params); 3334 snd_pcm_hw_convert_to_old_params(oparams, params); 3335 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3336 if (!err) 3337 err = -EFAULT; 3338 } 3339 out: 3340 kfree(params); 3341 kfree(oparams); 3342 return err; 3343 } 3344 3345 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3346 struct snd_pcm_hw_params_old __user * _oparams) 3347 { 3348 struct snd_pcm_hw_params *params; 3349 struct snd_pcm_hw_params_old *oparams = NULL; 3350 int err; 3351 3352 params = kmalloc(sizeof(*params), GFP_KERNEL); 3353 if (!params) { 3354 err = -ENOMEM; 3355 goto out; 3356 } 3357 oparams = kmalloc(sizeof(*oparams), GFP_KERNEL); 3358 if (!oparams) { 3359 err = -ENOMEM; 3360 goto out; 3361 } 3362 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) { 3363 err = -EFAULT; 3364 goto out; 3365 } 3366 snd_pcm_hw_convert_from_old_params(params, oparams); 3367 err = snd_pcm_hw_params(substream, params); 3368 snd_pcm_hw_convert_to_old_params(oparams, params); 3369 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3370 if (!err) 3371 err = -EFAULT; 3372 } 3373 out: 3374 kfree(params); 3375 kfree(oparams); 3376 return err; 3377 } 3378 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3379 3380 #ifndef CONFIG_MMU 3381 unsigned long dummy_get_unmapped_area(struct file *file, unsigned long addr, 3382 unsigned long len, unsigned long pgoff, 3383 unsigned long flags) 3384 { 3385 return 0; 3386 } 3387 #else 3388 # define dummy_get_unmapped_area NULL 3389 #endif 3390 3391 /* 3392 * Register section 3393 */ 3394 3395 const struct file_operations snd_pcm_f_ops[2] = { 3396 { 3397 .owner = THIS_MODULE, 3398 .write = snd_pcm_write, 3399 .aio_write = snd_pcm_aio_write, 3400 .open = snd_pcm_playback_open, 3401 .release = snd_pcm_release, 3402 .poll = snd_pcm_playback_poll, 3403 .unlocked_ioctl = snd_pcm_playback_ioctl, 3404 .compat_ioctl = snd_pcm_ioctl_compat, 3405 .mmap = snd_pcm_mmap, 3406 .fasync = snd_pcm_fasync, 3407 .get_unmapped_area = dummy_get_unmapped_area, 3408 }, 3409 { 3410 .owner = THIS_MODULE, 3411 .read = snd_pcm_read, 3412 .aio_read = snd_pcm_aio_read, 3413 .open = snd_pcm_capture_open, 3414 .release = snd_pcm_release, 3415 .poll = snd_pcm_capture_poll, 3416 .unlocked_ioctl = snd_pcm_capture_ioctl, 3417 .compat_ioctl = snd_pcm_ioctl_compat, 3418 .mmap = snd_pcm_mmap, 3419 .fasync = snd_pcm_fasync, 3420 .get_unmapped_area = dummy_get_unmapped_area, 3421 } 3422 }; 3423