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/module.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/time.h> 27 #include <linux/pm_qos.h> 28 #include <linux/uio.h> 29 #include <linux/dma-mapping.h> 30 #include <sound/core.h> 31 #include <sound/control.h> 32 #include <sound/info.h> 33 #include <sound/pcm.h> 34 #include <sound/pcm_params.h> 35 #include <sound/timer.h> 36 #include <sound/minors.h> 37 #include <asm/io.h> 38 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 39 #include <dma-coherence.h> 40 #endif 41 42 /* 43 * Compatibility 44 */ 45 46 struct snd_pcm_hw_params_old { 47 unsigned int flags; 48 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 49 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 50 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 51 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 52 unsigned int rmask; 53 unsigned int cmask; 54 unsigned int info; 55 unsigned int msbits; 56 unsigned int rate_num; 57 unsigned int rate_den; 58 snd_pcm_uframes_t fifo_size; 59 unsigned char reserved[64]; 60 }; 61 62 #ifdef CONFIG_SND_SUPPORT_OLD_API 63 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 64 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 65 66 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 67 struct snd_pcm_hw_params_old __user * _oparams); 68 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 69 struct snd_pcm_hw_params_old __user * _oparams); 70 #endif 71 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 72 73 /* 74 * 75 */ 76 77 DEFINE_RWLOCK(snd_pcm_link_rwlock); 78 EXPORT_SYMBOL(snd_pcm_link_rwlock); 79 80 static DECLARE_RWSEM(snd_pcm_link_rwsem); 81 82 static inline mm_segment_t snd_enter_user(void) 83 { 84 mm_segment_t fs = get_fs(); 85 set_fs(get_ds()); 86 return fs; 87 } 88 89 static inline void snd_leave_user(mm_segment_t fs) 90 { 91 set_fs(fs); 92 } 93 94 95 96 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 97 { 98 struct snd_pcm_runtime *runtime; 99 struct snd_pcm *pcm = substream->pcm; 100 struct snd_pcm_str *pstr = substream->pstr; 101 102 memset(info, 0, sizeof(*info)); 103 info->card = pcm->card->number; 104 info->device = pcm->device; 105 info->stream = substream->stream; 106 info->subdevice = substream->number; 107 strlcpy(info->id, pcm->id, sizeof(info->id)); 108 strlcpy(info->name, pcm->name, sizeof(info->name)); 109 info->dev_class = pcm->dev_class; 110 info->dev_subclass = pcm->dev_subclass; 111 info->subdevices_count = pstr->substream_count; 112 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 113 strlcpy(info->subname, substream->name, sizeof(info->subname)); 114 runtime = substream->runtime; 115 /* AB: FIXME!!! This is definitely nonsense */ 116 if (runtime) { 117 info->sync = runtime->sync; 118 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 119 } 120 return 0; 121 } 122 123 int snd_pcm_info_user(struct snd_pcm_substream *substream, 124 struct snd_pcm_info __user * _info) 125 { 126 struct snd_pcm_info *info; 127 int err; 128 129 info = kmalloc(sizeof(*info), GFP_KERNEL); 130 if (! info) 131 return -ENOMEM; 132 err = snd_pcm_info(substream, info); 133 if (err >= 0) { 134 if (copy_to_user(_info, info, sizeof(*info))) 135 err = -EFAULT; 136 } 137 kfree(info); 138 return err; 139 } 140 141 #undef RULES_DEBUG 142 143 #ifdef RULES_DEBUG 144 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v 145 static const char * const snd_pcm_hw_param_names[] = { 146 HW_PARAM(ACCESS), 147 HW_PARAM(FORMAT), 148 HW_PARAM(SUBFORMAT), 149 HW_PARAM(SAMPLE_BITS), 150 HW_PARAM(FRAME_BITS), 151 HW_PARAM(CHANNELS), 152 HW_PARAM(RATE), 153 HW_PARAM(PERIOD_TIME), 154 HW_PARAM(PERIOD_SIZE), 155 HW_PARAM(PERIOD_BYTES), 156 HW_PARAM(PERIODS), 157 HW_PARAM(BUFFER_TIME), 158 HW_PARAM(BUFFER_SIZE), 159 HW_PARAM(BUFFER_BYTES), 160 HW_PARAM(TICK_TIME), 161 }; 162 #endif 163 164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 165 struct snd_pcm_hw_params *params) 166 { 167 unsigned int k; 168 struct snd_pcm_hardware *hw; 169 struct snd_interval *i = NULL; 170 struct snd_mask *m = NULL; 171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints; 172 unsigned int rstamps[constrs->rules_num]; 173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 174 unsigned int stamp = 2; 175 int changed, again; 176 177 params->info = 0; 178 params->fifo_size = 0; 179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 180 params->msbits = 0; 181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 182 params->rate_num = 0; 183 params->rate_den = 0; 184 } 185 186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 187 m = hw_param_mask(params, k); 188 if (snd_mask_empty(m)) 189 return -EINVAL; 190 if (!(params->rmask & (1 << k))) 191 continue; 192 #ifdef RULES_DEBUG 193 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]); 194 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 195 #endif 196 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 197 #ifdef RULES_DEBUG 198 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 199 #endif 200 if (changed) 201 params->cmask |= 1 << k; 202 if (changed < 0) 203 return changed; 204 } 205 206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 207 i = hw_param_interval(params, k); 208 if (snd_interval_empty(i)) 209 return -EINVAL; 210 if (!(params->rmask & (1 << k))) 211 continue; 212 #ifdef RULES_DEBUG 213 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]); 214 if (i->empty) 215 printk("empty"); 216 else 217 printk("%c%u %u%c", 218 i->openmin ? '(' : '[', i->min, 219 i->max, i->openmax ? ')' : ']'); 220 printk(" -> "); 221 #endif 222 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 223 #ifdef RULES_DEBUG 224 if (i->empty) 225 printk("empty\n"); 226 else 227 printk("%c%u %u%c\n", 228 i->openmin ? '(' : '[', i->min, 229 i->max, i->openmax ? ')' : ']'); 230 #endif 231 if (changed) 232 params->cmask |= 1 << k; 233 if (changed < 0) 234 return changed; 235 } 236 237 for (k = 0; k < constrs->rules_num; k++) 238 rstamps[k] = 0; 239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 241 do { 242 again = 0; 243 for (k = 0; k < constrs->rules_num; k++) { 244 struct snd_pcm_hw_rule *r = &constrs->rules[k]; 245 unsigned int d; 246 int doit = 0; 247 if (r->cond && !(r->cond & params->flags)) 248 continue; 249 for (d = 0; r->deps[d] >= 0; d++) { 250 if (vstamps[r->deps[d]] > rstamps[k]) { 251 doit = 1; 252 break; 253 } 254 } 255 if (!doit) 256 continue; 257 #ifdef RULES_DEBUG 258 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func); 259 if (r->var >= 0) { 260 printk("%s = ", snd_pcm_hw_param_names[r->var]); 261 if (hw_is_mask(r->var)) { 262 m = hw_param_mask(params, r->var); 263 printk("%x", *m->bits); 264 } else { 265 i = hw_param_interval(params, r->var); 266 if (i->empty) 267 printk("empty"); 268 else 269 printk("%c%u %u%c", 270 i->openmin ? '(' : '[', i->min, 271 i->max, i->openmax ? ')' : ']'); 272 } 273 } 274 #endif 275 changed = r->func(params, r); 276 #ifdef RULES_DEBUG 277 if (r->var >= 0) { 278 printk(" -> "); 279 if (hw_is_mask(r->var)) 280 printk("%x", *m->bits); 281 else { 282 if (i->empty) 283 printk("empty"); 284 else 285 printk("%c%u %u%c", 286 i->openmin ? '(' : '[', i->min, 287 i->max, i->openmax ? ')' : ']'); 288 } 289 } 290 printk("\n"); 291 #endif 292 rstamps[k] = stamp; 293 if (changed && r->var >= 0) { 294 params->cmask |= (1 << r->var); 295 vstamps[r->var] = stamp; 296 again = 1; 297 } 298 if (changed < 0) 299 return changed; 300 stamp++; 301 } 302 } while (again); 303 if (!params->msbits) { 304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 305 if (snd_interval_single(i)) 306 params->msbits = snd_interval_value(i); 307 } 308 309 if (!params->rate_den) { 310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 311 if (snd_interval_single(i)) { 312 params->rate_num = snd_interval_value(i); 313 params->rate_den = 1; 314 } 315 } 316 317 hw = &substream->runtime->hw; 318 if (!params->info) 319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES; 320 if (!params->fifo_size) { 321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 323 if (snd_mask_min(m) == snd_mask_max(m) && 324 snd_interval_min(i) == snd_interval_max(i)) { 325 changed = substream->ops->ioctl(substream, 326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 327 if (changed < 0) 328 return changed; 329 } 330 } 331 params->rmask = 0; 332 return 0; 333 } 334 335 EXPORT_SYMBOL(snd_pcm_hw_refine); 336 337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 338 struct snd_pcm_hw_params __user * _params) 339 { 340 struct snd_pcm_hw_params *params; 341 int err; 342 343 params = memdup_user(_params, sizeof(*params)); 344 if (IS_ERR(params)) 345 return PTR_ERR(params); 346 347 err = snd_pcm_hw_refine(substream, params); 348 if (copy_to_user(_params, params, sizeof(*params))) { 349 if (!err) 350 err = -EFAULT; 351 } 352 353 kfree(params); 354 return err; 355 } 356 357 static int period_to_usecs(struct snd_pcm_runtime *runtime) 358 { 359 int usecs; 360 361 if (! runtime->rate) 362 return -1; /* invalid */ 363 364 /* take 75% of period time as the deadline */ 365 usecs = (750000 / runtime->rate) * runtime->period_size; 366 usecs += ((750000 % runtime->rate) * runtime->period_size) / 367 runtime->rate; 368 369 return usecs; 370 } 371 372 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 373 struct snd_pcm_hw_params *params) 374 { 375 struct snd_pcm_runtime *runtime; 376 int err, usecs; 377 unsigned int bits; 378 snd_pcm_uframes_t frames; 379 380 if (PCM_RUNTIME_CHECK(substream)) 381 return -ENXIO; 382 runtime = substream->runtime; 383 snd_pcm_stream_lock_irq(substream); 384 switch (runtime->status->state) { 385 case SNDRV_PCM_STATE_OPEN: 386 case SNDRV_PCM_STATE_SETUP: 387 case SNDRV_PCM_STATE_PREPARED: 388 break; 389 default: 390 snd_pcm_stream_unlock_irq(substream); 391 return -EBADFD; 392 } 393 snd_pcm_stream_unlock_irq(substream); 394 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 395 if (!substream->oss.oss) 396 #endif 397 if (atomic_read(&substream->mmap_count)) 398 return -EBADFD; 399 400 params->rmask = ~0U; 401 err = snd_pcm_hw_refine(substream, params); 402 if (err < 0) 403 goto _error; 404 405 err = snd_pcm_hw_params_choose(substream, params); 406 if (err < 0) 407 goto _error; 408 409 if (substream->ops->hw_params != NULL) { 410 err = substream->ops->hw_params(substream, params); 411 if (err < 0) 412 goto _error; 413 } 414 415 runtime->access = params_access(params); 416 runtime->format = params_format(params); 417 runtime->subformat = params_subformat(params); 418 runtime->channels = params_channels(params); 419 runtime->rate = params_rate(params); 420 runtime->period_size = params_period_size(params); 421 runtime->periods = params_periods(params); 422 runtime->buffer_size = params_buffer_size(params); 423 runtime->info = params->info; 424 runtime->rate_num = params->rate_num; 425 runtime->rate_den = params->rate_den; 426 runtime->no_period_wakeup = 427 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 428 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 429 430 bits = snd_pcm_format_physical_width(runtime->format); 431 runtime->sample_bits = bits; 432 bits *= runtime->channels; 433 runtime->frame_bits = bits; 434 frames = 1; 435 while (bits % 8 != 0) { 436 bits *= 2; 437 frames *= 2; 438 } 439 runtime->byte_align = bits / 8; 440 runtime->min_align = frames; 441 442 /* Default sw params */ 443 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 444 runtime->period_step = 1; 445 runtime->control->avail_min = runtime->period_size; 446 runtime->start_threshold = 1; 447 runtime->stop_threshold = runtime->buffer_size; 448 runtime->silence_threshold = 0; 449 runtime->silence_size = 0; 450 runtime->boundary = runtime->buffer_size; 451 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 452 runtime->boundary *= 2; 453 454 snd_pcm_timer_resolution_change(substream); 455 runtime->status->state = SNDRV_PCM_STATE_SETUP; 456 457 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 458 pm_qos_remove_request(&substream->latency_pm_qos_req); 459 if ((usecs = period_to_usecs(runtime)) >= 0) 460 pm_qos_add_request(&substream->latency_pm_qos_req, 461 PM_QOS_CPU_DMA_LATENCY, usecs); 462 return 0; 463 _error: 464 /* hardware might be unusable from this time, 465 so we force application to retry to set 466 the correct hardware parameter settings */ 467 runtime->status->state = SNDRV_PCM_STATE_OPEN; 468 if (substream->ops->hw_free != NULL) 469 substream->ops->hw_free(substream); 470 return err; 471 } 472 473 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 474 struct snd_pcm_hw_params __user * _params) 475 { 476 struct snd_pcm_hw_params *params; 477 int err; 478 479 params = memdup_user(_params, sizeof(*params)); 480 if (IS_ERR(params)) 481 return PTR_ERR(params); 482 483 err = snd_pcm_hw_params(substream, params); 484 if (copy_to_user(_params, params, sizeof(*params))) { 485 if (!err) 486 err = -EFAULT; 487 } 488 489 kfree(params); 490 return err; 491 } 492 493 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 494 { 495 struct snd_pcm_runtime *runtime; 496 int result = 0; 497 498 if (PCM_RUNTIME_CHECK(substream)) 499 return -ENXIO; 500 runtime = substream->runtime; 501 snd_pcm_stream_lock_irq(substream); 502 switch (runtime->status->state) { 503 case SNDRV_PCM_STATE_SETUP: 504 case SNDRV_PCM_STATE_PREPARED: 505 break; 506 default: 507 snd_pcm_stream_unlock_irq(substream); 508 return -EBADFD; 509 } 510 snd_pcm_stream_unlock_irq(substream); 511 if (atomic_read(&substream->mmap_count)) 512 return -EBADFD; 513 if (substream->ops->hw_free) 514 result = substream->ops->hw_free(substream); 515 runtime->status->state = SNDRV_PCM_STATE_OPEN; 516 pm_qos_remove_request(&substream->latency_pm_qos_req); 517 return result; 518 } 519 520 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 521 struct snd_pcm_sw_params *params) 522 { 523 struct snd_pcm_runtime *runtime; 524 int err; 525 526 if (PCM_RUNTIME_CHECK(substream)) 527 return -ENXIO; 528 runtime = substream->runtime; 529 snd_pcm_stream_lock_irq(substream); 530 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 531 snd_pcm_stream_unlock_irq(substream); 532 return -EBADFD; 533 } 534 snd_pcm_stream_unlock_irq(substream); 535 536 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 537 return -EINVAL; 538 if (params->avail_min == 0) 539 return -EINVAL; 540 if (params->silence_size >= runtime->boundary) { 541 if (params->silence_threshold != 0) 542 return -EINVAL; 543 } else { 544 if (params->silence_size > params->silence_threshold) 545 return -EINVAL; 546 if (params->silence_threshold > runtime->buffer_size) 547 return -EINVAL; 548 } 549 err = 0; 550 snd_pcm_stream_lock_irq(substream); 551 runtime->tstamp_mode = params->tstamp_mode; 552 runtime->period_step = params->period_step; 553 runtime->control->avail_min = params->avail_min; 554 runtime->start_threshold = params->start_threshold; 555 runtime->stop_threshold = params->stop_threshold; 556 runtime->silence_threshold = params->silence_threshold; 557 runtime->silence_size = params->silence_size; 558 params->boundary = runtime->boundary; 559 if (snd_pcm_running(substream)) { 560 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 561 runtime->silence_size > 0) 562 snd_pcm_playback_silence(substream, ULONG_MAX); 563 err = snd_pcm_update_state(substream, runtime); 564 } 565 snd_pcm_stream_unlock_irq(substream); 566 return err; 567 } 568 569 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 570 struct snd_pcm_sw_params __user * _params) 571 { 572 struct snd_pcm_sw_params params; 573 int err; 574 if (copy_from_user(¶ms, _params, sizeof(params))) 575 return -EFAULT; 576 err = snd_pcm_sw_params(substream, ¶ms); 577 if (copy_to_user(_params, ¶ms, sizeof(params))) 578 return -EFAULT; 579 return err; 580 } 581 582 int snd_pcm_status(struct snd_pcm_substream *substream, 583 struct snd_pcm_status *status) 584 { 585 struct snd_pcm_runtime *runtime = substream->runtime; 586 587 snd_pcm_stream_lock_irq(substream); 588 status->state = runtime->status->state; 589 status->suspended_state = runtime->status->suspended_state; 590 if (status->state == SNDRV_PCM_STATE_OPEN) 591 goto _end; 592 status->trigger_tstamp = runtime->trigger_tstamp; 593 if (snd_pcm_running(substream)) { 594 snd_pcm_update_hw_ptr(substream); 595 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 596 status->tstamp = runtime->status->tstamp; 597 goto _tstamp_end; 598 } 599 } 600 snd_pcm_gettime(runtime, &status->tstamp); 601 _tstamp_end: 602 status->appl_ptr = runtime->control->appl_ptr; 603 status->hw_ptr = runtime->status->hw_ptr; 604 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 605 status->avail = snd_pcm_playback_avail(runtime); 606 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 607 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 608 status->delay = runtime->buffer_size - status->avail; 609 status->delay += runtime->delay; 610 } else 611 status->delay = 0; 612 } else { 613 status->avail = snd_pcm_capture_avail(runtime); 614 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 615 status->delay = status->avail + runtime->delay; 616 else 617 status->delay = 0; 618 } 619 status->avail_max = runtime->avail_max; 620 status->overrange = runtime->overrange; 621 runtime->avail_max = 0; 622 runtime->overrange = 0; 623 _end: 624 snd_pcm_stream_unlock_irq(substream); 625 return 0; 626 } 627 628 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 629 struct snd_pcm_status __user * _status) 630 { 631 struct snd_pcm_status status; 632 int res; 633 634 memset(&status, 0, sizeof(status)); 635 res = snd_pcm_status(substream, &status); 636 if (res < 0) 637 return res; 638 if (copy_to_user(_status, &status, sizeof(status))) 639 return -EFAULT; 640 return 0; 641 } 642 643 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 644 struct snd_pcm_channel_info * info) 645 { 646 struct snd_pcm_runtime *runtime; 647 unsigned int channel; 648 649 channel = info->channel; 650 runtime = substream->runtime; 651 snd_pcm_stream_lock_irq(substream); 652 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 653 snd_pcm_stream_unlock_irq(substream); 654 return -EBADFD; 655 } 656 snd_pcm_stream_unlock_irq(substream); 657 if (channel >= runtime->channels) 658 return -EINVAL; 659 memset(info, 0, sizeof(*info)); 660 info->channel = channel; 661 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 662 } 663 664 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 665 struct snd_pcm_channel_info __user * _info) 666 { 667 struct snd_pcm_channel_info info; 668 int res; 669 670 if (copy_from_user(&info, _info, sizeof(info))) 671 return -EFAULT; 672 res = snd_pcm_channel_info(substream, &info); 673 if (res < 0) 674 return res; 675 if (copy_to_user(_info, &info, sizeof(info))) 676 return -EFAULT; 677 return 0; 678 } 679 680 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 681 { 682 struct snd_pcm_runtime *runtime = substream->runtime; 683 if (runtime->trigger_master == NULL) 684 return; 685 if (runtime->trigger_master == substream) { 686 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 687 } else { 688 snd_pcm_trigger_tstamp(runtime->trigger_master); 689 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 690 } 691 runtime->trigger_master = NULL; 692 } 693 694 struct action_ops { 695 int (*pre_action)(struct snd_pcm_substream *substream, int state); 696 int (*do_action)(struct snd_pcm_substream *substream, int state); 697 void (*undo_action)(struct snd_pcm_substream *substream, int state); 698 void (*post_action)(struct snd_pcm_substream *substream, int state); 699 }; 700 701 /* 702 * this functions is core for handling of linked stream 703 * Note: the stream state might be changed also on failure 704 * Note2: call with calling stream lock + link lock 705 */ 706 static int snd_pcm_action_group(struct action_ops *ops, 707 struct snd_pcm_substream *substream, 708 int state, int do_lock) 709 { 710 struct snd_pcm_substream *s = NULL; 711 struct snd_pcm_substream *s1; 712 int res = 0; 713 714 snd_pcm_group_for_each_entry(s, substream) { 715 if (do_lock && s != substream) 716 spin_lock_nested(&s->self_group.lock, 717 SINGLE_DEPTH_NESTING); 718 res = ops->pre_action(s, state); 719 if (res < 0) 720 goto _unlock; 721 } 722 snd_pcm_group_for_each_entry(s, substream) { 723 res = ops->do_action(s, state); 724 if (res < 0) { 725 if (ops->undo_action) { 726 snd_pcm_group_for_each_entry(s1, substream) { 727 if (s1 == s) /* failed stream */ 728 break; 729 ops->undo_action(s1, state); 730 } 731 } 732 s = NULL; /* unlock all */ 733 goto _unlock; 734 } 735 } 736 snd_pcm_group_for_each_entry(s, substream) { 737 ops->post_action(s, state); 738 } 739 _unlock: 740 if (do_lock) { 741 /* unlock streams */ 742 snd_pcm_group_for_each_entry(s1, substream) { 743 if (s1 != substream) 744 spin_unlock(&s1->self_group.lock); 745 if (s1 == s) /* end */ 746 break; 747 } 748 } 749 return res; 750 } 751 752 /* 753 * Note: call with stream lock 754 */ 755 static int snd_pcm_action_single(struct action_ops *ops, 756 struct snd_pcm_substream *substream, 757 int state) 758 { 759 int res; 760 761 res = ops->pre_action(substream, state); 762 if (res < 0) 763 return res; 764 res = ops->do_action(substream, state); 765 if (res == 0) 766 ops->post_action(substream, state); 767 else if (ops->undo_action) 768 ops->undo_action(substream, state); 769 return res; 770 } 771 772 /* 773 * Note: call with stream lock 774 */ 775 static int snd_pcm_action(struct action_ops *ops, 776 struct snd_pcm_substream *substream, 777 int state) 778 { 779 int res; 780 781 if (snd_pcm_stream_linked(substream)) { 782 if (!spin_trylock(&substream->group->lock)) { 783 spin_unlock(&substream->self_group.lock); 784 spin_lock(&substream->group->lock); 785 spin_lock(&substream->self_group.lock); 786 } 787 res = snd_pcm_action_group(ops, substream, state, 1); 788 spin_unlock(&substream->group->lock); 789 } else { 790 res = snd_pcm_action_single(ops, substream, state); 791 } 792 return res; 793 } 794 795 /* 796 * Note: don't use any locks before 797 */ 798 static int snd_pcm_action_lock_irq(struct action_ops *ops, 799 struct snd_pcm_substream *substream, 800 int state) 801 { 802 int res; 803 804 read_lock_irq(&snd_pcm_link_rwlock); 805 if (snd_pcm_stream_linked(substream)) { 806 spin_lock(&substream->group->lock); 807 spin_lock(&substream->self_group.lock); 808 res = snd_pcm_action_group(ops, substream, state, 1); 809 spin_unlock(&substream->self_group.lock); 810 spin_unlock(&substream->group->lock); 811 } else { 812 spin_lock(&substream->self_group.lock); 813 res = snd_pcm_action_single(ops, substream, state); 814 spin_unlock(&substream->self_group.lock); 815 } 816 read_unlock_irq(&snd_pcm_link_rwlock); 817 return res; 818 } 819 820 /* 821 */ 822 static int snd_pcm_action_nonatomic(struct action_ops *ops, 823 struct snd_pcm_substream *substream, 824 int state) 825 { 826 int res; 827 828 down_read(&snd_pcm_link_rwsem); 829 if (snd_pcm_stream_linked(substream)) 830 res = snd_pcm_action_group(ops, substream, state, 0); 831 else 832 res = snd_pcm_action_single(ops, substream, state); 833 up_read(&snd_pcm_link_rwsem); 834 return res; 835 } 836 837 /* 838 * start callbacks 839 */ 840 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 841 { 842 struct snd_pcm_runtime *runtime = substream->runtime; 843 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 844 return -EBADFD; 845 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 846 !snd_pcm_playback_data(substream)) 847 return -EPIPE; 848 runtime->trigger_master = substream; 849 return 0; 850 } 851 852 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 853 { 854 if (substream->runtime->trigger_master != substream) 855 return 0; 856 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 857 } 858 859 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 860 { 861 if (substream->runtime->trigger_master == substream) 862 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 863 } 864 865 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 866 { 867 struct snd_pcm_runtime *runtime = substream->runtime; 868 snd_pcm_trigger_tstamp(substream); 869 runtime->hw_ptr_jiffies = jiffies; 870 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 871 runtime->rate; 872 runtime->status->state = state; 873 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 874 runtime->silence_size > 0) 875 snd_pcm_playback_silence(substream, ULONG_MAX); 876 if (substream->timer) 877 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, 878 &runtime->trigger_tstamp); 879 } 880 881 static struct action_ops snd_pcm_action_start = { 882 .pre_action = snd_pcm_pre_start, 883 .do_action = snd_pcm_do_start, 884 .undo_action = snd_pcm_undo_start, 885 .post_action = snd_pcm_post_start 886 }; 887 888 /** 889 * snd_pcm_start - start all linked streams 890 * @substream: the PCM substream instance 891 */ 892 int snd_pcm_start(struct snd_pcm_substream *substream) 893 { 894 return snd_pcm_action(&snd_pcm_action_start, substream, 895 SNDRV_PCM_STATE_RUNNING); 896 } 897 898 /* 899 * stop callbacks 900 */ 901 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 902 { 903 struct snd_pcm_runtime *runtime = substream->runtime; 904 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 905 return -EBADFD; 906 runtime->trigger_master = substream; 907 return 0; 908 } 909 910 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 911 { 912 if (substream->runtime->trigger_master == substream && 913 snd_pcm_running(substream)) 914 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 915 return 0; /* unconditonally stop all substreams */ 916 } 917 918 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 919 { 920 struct snd_pcm_runtime *runtime = substream->runtime; 921 if (runtime->status->state != state) { 922 snd_pcm_trigger_tstamp(substream); 923 if (substream->timer) 924 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 925 &runtime->trigger_tstamp); 926 runtime->status->state = state; 927 } 928 wake_up(&runtime->sleep); 929 wake_up(&runtime->tsleep); 930 } 931 932 static struct action_ops snd_pcm_action_stop = { 933 .pre_action = snd_pcm_pre_stop, 934 .do_action = snd_pcm_do_stop, 935 .post_action = snd_pcm_post_stop 936 }; 937 938 /** 939 * snd_pcm_stop - try to stop all running streams in the substream group 940 * @substream: the PCM substream instance 941 * @state: PCM state after stopping the stream 942 * 943 * The state of each stream is then changed to the given state unconditionally. 944 */ 945 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 946 { 947 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 948 } 949 950 EXPORT_SYMBOL(snd_pcm_stop); 951 952 /** 953 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 954 * @substream: the PCM substream 955 * 956 * After stopping, the state is changed to SETUP. 957 * Unlike snd_pcm_stop(), this affects only the given stream. 958 */ 959 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 960 { 961 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 962 SNDRV_PCM_STATE_SETUP); 963 } 964 965 /* 966 * pause callbacks 967 */ 968 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 969 { 970 struct snd_pcm_runtime *runtime = substream->runtime; 971 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 972 return -ENOSYS; 973 if (push) { 974 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 975 return -EBADFD; 976 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 977 return -EBADFD; 978 runtime->trigger_master = substream; 979 return 0; 980 } 981 982 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 983 { 984 if (substream->runtime->trigger_master != substream) 985 return 0; 986 /* some drivers might use hw_ptr to recover from the pause - 987 update the hw_ptr now */ 988 if (push) 989 snd_pcm_update_hw_ptr(substream); 990 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 991 * a delta between the current jiffies, this gives a large enough 992 * delta, effectively to skip the check once. 993 */ 994 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 995 return substream->ops->trigger(substream, 996 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 997 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 998 } 999 1000 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1001 { 1002 if (substream->runtime->trigger_master == substream) 1003 substream->ops->trigger(substream, 1004 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1005 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1006 } 1007 1008 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1009 { 1010 struct snd_pcm_runtime *runtime = substream->runtime; 1011 snd_pcm_trigger_tstamp(substream); 1012 if (push) { 1013 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1014 if (substream->timer) 1015 snd_timer_notify(substream->timer, 1016 SNDRV_TIMER_EVENT_MPAUSE, 1017 &runtime->trigger_tstamp); 1018 wake_up(&runtime->sleep); 1019 wake_up(&runtime->tsleep); 1020 } else { 1021 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1022 if (substream->timer) 1023 snd_timer_notify(substream->timer, 1024 SNDRV_TIMER_EVENT_MCONTINUE, 1025 &runtime->trigger_tstamp); 1026 } 1027 } 1028 1029 static struct action_ops snd_pcm_action_pause = { 1030 .pre_action = snd_pcm_pre_pause, 1031 .do_action = snd_pcm_do_pause, 1032 .undo_action = snd_pcm_undo_pause, 1033 .post_action = snd_pcm_post_pause 1034 }; 1035 1036 /* 1037 * Push/release the pause for all linked streams. 1038 */ 1039 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1040 { 1041 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1042 } 1043 1044 #ifdef CONFIG_PM 1045 /* suspend */ 1046 1047 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1048 { 1049 struct snd_pcm_runtime *runtime = substream->runtime; 1050 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1051 return -EBUSY; 1052 runtime->trigger_master = substream; 1053 return 0; 1054 } 1055 1056 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1057 { 1058 struct snd_pcm_runtime *runtime = substream->runtime; 1059 if (runtime->trigger_master != substream) 1060 return 0; 1061 if (! snd_pcm_running(substream)) 1062 return 0; 1063 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1064 return 0; /* suspend unconditionally */ 1065 } 1066 1067 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1068 { 1069 struct snd_pcm_runtime *runtime = substream->runtime; 1070 snd_pcm_trigger_tstamp(substream); 1071 if (substream->timer) 1072 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1073 &runtime->trigger_tstamp); 1074 runtime->status->suspended_state = runtime->status->state; 1075 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1076 wake_up(&runtime->sleep); 1077 wake_up(&runtime->tsleep); 1078 } 1079 1080 static struct action_ops snd_pcm_action_suspend = { 1081 .pre_action = snd_pcm_pre_suspend, 1082 .do_action = snd_pcm_do_suspend, 1083 .post_action = snd_pcm_post_suspend 1084 }; 1085 1086 /** 1087 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1088 * @substream: the PCM substream 1089 * 1090 * After this call, all streams are changed to SUSPENDED state. 1091 */ 1092 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1093 { 1094 int err; 1095 unsigned long flags; 1096 1097 if (! substream) 1098 return 0; 1099 1100 snd_pcm_stream_lock_irqsave(substream, flags); 1101 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1102 snd_pcm_stream_unlock_irqrestore(substream, flags); 1103 return err; 1104 } 1105 1106 EXPORT_SYMBOL(snd_pcm_suspend); 1107 1108 /** 1109 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1110 * @pcm: the PCM instance 1111 * 1112 * After this call, all streams are changed to SUSPENDED state. 1113 */ 1114 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1115 { 1116 struct snd_pcm_substream *substream; 1117 int stream, err = 0; 1118 1119 if (! pcm) 1120 return 0; 1121 1122 for (stream = 0; stream < 2; stream++) { 1123 for (substream = pcm->streams[stream].substream; 1124 substream; substream = substream->next) { 1125 /* FIXME: the open/close code should lock this as well */ 1126 if (substream->runtime == NULL) 1127 continue; 1128 err = snd_pcm_suspend(substream); 1129 if (err < 0 && err != -EBUSY) 1130 return err; 1131 } 1132 } 1133 return 0; 1134 } 1135 1136 EXPORT_SYMBOL(snd_pcm_suspend_all); 1137 1138 /* resume */ 1139 1140 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1141 { 1142 struct snd_pcm_runtime *runtime = substream->runtime; 1143 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1144 return -ENOSYS; 1145 runtime->trigger_master = substream; 1146 return 0; 1147 } 1148 1149 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1150 { 1151 struct snd_pcm_runtime *runtime = substream->runtime; 1152 if (runtime->trigger_master != substream) 1153 return 0; 1154 /* DMA not running previously? */ 1155 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1156 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1157 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1158 return 0; 1159 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1160 } 1161 1162 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1163 { 1164 if (substream->runtime->trigger_master == substream && 1165 snd_pcm_running(substream)) 1166 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1167 } 1168 1169 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1170 { 1171 struct snd_pcm_runtime *runtime = substream->runtime; 1172 snd_pcm_trigger_tstamp(substream); 1173 if (substream->timer) 1174 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1175 &runtime->trigger_tstamp); 1176 runtime->status->state = runtime->status->suspended_state; 1177 } 1178 1179 static struct action_ops snd_pcm_action_resume = { 1180 .pre_action = snd_pcm_pre_resume, 1181 .do_action = snd_pcm_do_resume, 1182 .undo_action = snd_pcm_undo_resume, 1183 .post_action = snd_pcm_post_resume 1184 }; 1185 1186 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1187 { 1188 struct snd_card *card = substream->pcm->card; 1189 int res; 1190 1191 snd_power_lock(card); 1192 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1193 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1194 snd_power_unlock(card); 1195 return res; 1196 } 1197 1198 #else 1199 1200 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1201 { 1202 return -ENOSYS; 1203 } 1204 1205 #endif /* CONFIG_PM */ 1206 1207 /* 1208 * xrun ioctl 1209 * 1210 * Change the RUNNING stream(s) to XRUN state. 1211 */ 1212 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1213 { 1214 struct snd_card *card = substream->pcm->card; 1215 struct snd_pcm_runtime *runtime = substream->runtime; 1216 int result; 1217 1218 snd_power_lock(card); 1219 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1220 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1221 if (result < 0) 1222 goto _unlock; 1223 } 1224 1225 snd_pcm_stream_lock_irq(substream); 1226 switch (runtime->status->state) { 1227 case SNDRV_PCM_STATE_XRUN: 1228 result = 0; /* already there */ 1229 break; 1230 case SNDRV_PCM_STATE_RUNNING: 1231 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1232 break; 1233 default: 1234 result = -EBADFD; 1235 } 1236 snd_pcm_stream_unlock_irq(substream); 1237 _unlock: 1238 snd_power_unlock(card); 1239 return result; 1240 } 1241 1242 /* 1243 * reset ioctl 1244 */ 1245 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1246 { 1247 struct snd_pcm_runtime *runtime = substream->runtime; 1248 switch (runtime->status->state) { 1249 case SNDRV_PCM_STATE_RUNNING: 1250 case SNDRV_PCM_STATE_PREPARED: 1251 case SNDRV_PCM_STATE_PAUSED: 1252 case SNDRV_PCM_STATE_SUSPENDED: 1253 return 0; 1254 default: 1255 return -EBADFD; 1256 } 1257 } 1258 1259 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1260 { 1261 struct snd_pcm_runtime *runtime = substream->runtime; 1262 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1263 if (err < 0) 1264 return err; 1265 runtime->hw_ptr_base = 0; 1266 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1267 runtime->status->hw_ptr % runtime->period_size; 1268 runtime->silence_start = runtime->status->hw_ptr; 1269 runtime->silence_filled = 0; 1270 return 0; 1271 } 1272 1273 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1274 { 1275 struct snd_pcm_runtime *runtime = substream->runtime; 1276 runtime->control->appl_ptr = runtime->status->hw_ptr; 1277 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1278 runtime->silence_size > 0) 1279 snd_pcm_playback_silence(substream, ULONG_MAX); 1280 } 1281 1282 static struct action_ops snd_pcm_action_reset = { 1283 .pre_action = snd_pcm_pre_reset, 1284 .do_action = snd_pcm_do_reset, 1285 .post_action = snd_pcm_post_reset 1286 }; 1287 1288 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1289 { 1290 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1291 } 1292 1293 /* 1294 * prepare ioctl 1295 */ 1296 /* we use the second argument for updating f_flags */ 1297 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1298 int f_flags) 1299 { 1300 struct snd_pcm_runtime *runtime = substream->runtime; 1301 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1302 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1303 return -EBADFD; 1304 if (snd_pcm_running(substream)) 1305 return -EBUSY; 1306 substream->f_flags = f_flags; 1307 return 0; 1308 } 1309 1310 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1311 { 1312 int err; 1313 err = substream->ops->prepare(substream); 1314 if (err < 0) 1315 return err; 1316 return snd_pcm_do_reset(substream, 0); 1317 } 1318 1319 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1320 { 1321 struct snd_pcm_runtime *runtime = substream->runtime; 1322 runtime->control->appl_ptr = runtime->status->hw_ptr; 1323 runtime->status->state = SNDRV_PCM_STATE_PREPARED; 1324 } 1325 1326 static struct action_ops snd_pcm_action_prepare = { 1327 .pre_action = snd_pcm_pre_prepare, 1328 .do_action = snd_pcm_do_prepare, 1329 .post_action = snd_pcm_post_prepare 1330 }; 1331 1332 /** 1333 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1334 * @substream: the PCM substream instance 1335 * @file: file to refer f_flags 1336 */ 1337 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1338 struct file *file) 1339 { 1340 int res; 1341 struct snd_card *card = substream->pcm->card; 1342 int f_flags; 1343 1344 if (file) 1345 f_flags = file->f_flags; 1346 else 1347 f_flags = substream->f_flags; 1348 1349 snd_power_lock(card); 1350 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1351 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1352 substream, f_flags); 1353 snd_power_unlock(card); 1354 return res; 1355 } 1356 1357 /* 1358 * drain ioctl 1359 */ 1360 1361 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1362 { 1363 struct snd_pcm_runtime *runtime = substream->runtime; 1364 switch (runtime->status->state) { 1365 case SNDRV_PCM_STATE_OPEN: 1366 case SNDRV_PCM_STATE_DISCONNECTED: 1367 case SNDRV_PCM_STATE_SUSPENDED: 1368 return -EBADFD; 1369 } 1370 runtime->trigger_master = substream; 1371 return 0; 1372 } 1373 1374 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1375 { 1376 struct snd_pcm_runtime *runtime = substream->runtime; 1377 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1378 switch (runtime->status->state) { 1379 case SNDRV_PCM_STATE_PREPARED: 1380 /* start playback stream if possible */ 1381 if (! snd_pcm_playback_empty(substream)) { 1382 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1383 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1384 } 1385 break; 1386 case SNDRV_PCM_STATE_RUNNING: 1387 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1388 break; 1389 case SNDRV_PCM_STATE_XRUN: 1390 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1391 break; 1392 default: 1393 break; 1394 } 1395 } else { 1396 /* stop running stream */ 1397 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1398 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1399 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1400 snd_pcm_do_stop(substream, new_state); 1401 snd_pcm_post_stop(substream, new_state); 1402 } 1403 } 1404 return 0; 1405 } 1406 1407 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1408 { 1409 } 1410 1411 static struct action_ops snd_pcm_action_drain_init = { 1412 .pre_action = snd_pcm_pre_drain_init, 1413 .do_action = snd_pcm_do_drain_init, 1414 .post_action = snd_pcm_post_drain_init 1415 }; 1416 1417 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1418 1419 /* 1420 * Drain the stream(s). 1421 * When the substream is linked, sync until the draining of all playback streams 1422 * is finished. 1423 * After this call, all streams are supposed to be either SETUP or DRAINING 1424 * (capture only) state. 1425 */ 1426 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1427 struct file *file) 1428 { 1429 struct snd_card *card; 1430 struct snd_pcm_runtime *runtime; 1431 struct snd_pcm_substream *s; 1432 wait_queue_t wait; 1433 int result = 0; 1434 int nonblock = 0; 1435 1436 card = substream->pcm->card; 1437 runtime = substream->runtime; 1438 1439 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1440 return -EBADFD; 1441 1442 snd_power_lock(card); 1443 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1444 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1445 if (result < 0) { 1446 snd_power_unlock(card); 1447 return result; 1448 } 1449 } 1450 1451 if (file) { 1452 if (file->f_flags & O_NONBLOCK) 1453 nonblock = 1; 1454 } else if (substream->f_flags & O_NONBLOCK) 1455 nonblock = 1; 1456 1457 down_read(&snd_pcm_link_rwsem); 1458 snd_pcm_stream_lock_irq(substream); 1459 /* resume pause */ 1460 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1461 snd_pcm_pause(substream, 0); 1462 1463 /* pre-start/stop - all running streams are changed to DRAINING state */ 1464 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1465 if (result < 0) 1466 goto unlock; 1467 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1468 if (nonblock) { 1469 result = -EAGAIN; 1470 goto unlock; 1471 } 1472 1473 for (;;) { 1474 long tout; 1475 struct snd_pcm_runtime *to_check; 1476 if (signal_pending(current)) { 1477 result = -ERESTARTSYS; 1478 break; 1479 } 1480 /* find a substream to drain */ 1481 to_check = NULL; 1482 snd_pcm_group_for_each_entry(s, substream) { 1483 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1484 continue; 1485 runtime = s->runtime; 1486 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1487 to_check = runtime; 1488 break; 1489 } 1490 } 1491 if (!to_check) 1492 break; /* all drained */ 1493 init_waitqueue_entry(&wait, current); 1494 add_wait_queue(&to_check->sleep, &wait); 1495 snd_pcm_stream_unlock_irq(substream); 1496 up_read(&snd_pcm_link_rwsem); 1497 snd_power_unlock(card); 1498 if (runtime->no_period_wakeup) 1499 tout = MAX_SCHEDULE_TIMEOUT; 1500 else { 1501 tout = 10; 1502 if (runtime->rate) { 1503 long t = runtime->period_size * 2 / runtime->rate; 1504 tout = max(t, tout); 1505 } 1506 tout = msecs_to_jiffies(tout * 1000); 1507 } 1508 tout = schedule_timeout_interruptible(tout); 1509 snd_power_lock(card); 1510 down_read(&snd_pcm_link_rwsem); 1511 snd_pcm_stream_lock_irq(substream); 1512 remove_wait_queue(&to_check->sleep, &wait); 1513 if (tout == 0) { 1514 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1515 result = -ESTRPIPE; 1516 else { 1517 snd_printd("playback drain error (DMA or IRQ trouble?)\n"); 1518 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1519 result = -EIO; 1520 } 1521 break; 1522 } 1523 } 1524 1525 unlock: 1526 snd_pcm_stream_unlock_irq(substream); 1527 up_read(&snd_pcm_link_rwsem); 1528 snd_power_unlock(card); 1529 1530 return result; 1531 } 1532 1533 /* 1534 * drop ioctl 1535 * 1536 * Immediately put all linked substreams into SETUP state. 1537 */ 1538 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1539 { 1540 struct snd_pcm_runtime *runtime; 1541 int result = 0; 1542 1543 if (PCM_RUNTIME_CHECK(substream)) 1544 return -ENXIO; 1545 runtime = substream->runtime; 1546 1547 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1548 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1549 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1550 return -EBADFD; 1551 1552 snd_pcm_stream_lock_irq(substream); 1553 /* resume pause */ 1554 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1555 snd_pcm_pause(substream, 0); 1556 1557 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1558 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1559 snd_pcm_stream_unlock_irq(substream); 1560 1561 return result; 1562 } 1563 1564 1565 /* WARNING: Don't forget to fput back the file */ 1566 static struct file *snd_pcm_file_fd(int fd) 1567 { 1568 struct file *file; 1569 struct inode *inode; 1570 unsigned int minor; 1571 1572 file = fget(fd); 1573 if (!file) 1574 return NULL; 1575 inode = file->f_path.dentry->d_inode; 1576 if (!S_ISCHR(inode->i_mode) || 1577 imajor(inode) != snd_major) { 1578 fput(file); 1579 return NULL; 1580 } 1581 minor = iminor(inode); 1582 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) && 1583 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) { 1584 fput(file); 1585 return NULL; 1586 } 1587 return file; 1588 } 1589 1590 /* 1591 * PCM link handling 1592 */ 1593 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1594 { 1595 int res = 0; 1596 struct file *file; 1597 struct snd_pcm_file *pcm_file; 1598 struct snd_pcm_substream *substream1; 1599 struct snd_pcm_group *group; 1600 1601 file = snd_pcm_file_fd(fd); 1602 if (!file) 1603 return -EBADFD; 1604 pcm_file = file->private_data; 1605 substream1 = pcm_file->substream; 1606 group = kmalloc(sizeof(*group), GFP_KERNEL); 1607 if (!group) { 1608 res = -ENOMEM; 1609 goto _nolock; 1610 } 1611 down_write(&snd_pcm_link_rwsem); 1612 write_lock_irq(&snd_pcm_link_rwlock); 1613 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1614 substream->runtime->status->state != substream1->runtime->status->state) { 1615 res = -EBADFD; 1616 goto _end; 1617 } 1618 if (snd_pcm_stream_linked(substream1)) { 1619 res = -EALREADY; 1620 goto _end; 1621 } 1622 if (!snd_pcm_stream_linked(substream)) { 1623 substream->group = group; 1624 spin_lock_init(&substream->group->lock); 1625 INIT_LIST_HEAD(&substream->group->substreams); 1626 list_add_tail(&substream->link_list, &substream->group->substreams); 1627 substream->group->count = 1; 1628 } 1629 list_add_tail(&substream1->link_list, &substream->group->substreams); 1630 substream->group->count++; 1631 substream1->group = substream->group; 1632 _end: 1633 write_unlock_irq(&snd_pcm_link_rwlock); 1634 up_write(&snd_pcm_link_rwsem); 1635 _nolock: 1636 fput(file); 1637 if (res < 0) 1638 kfree(group); 1639 return res; 1640 } 1641 1642 static void relink_to_local(struct snd_pcm_substream *substream) 1643 { 1644 substream->group = &substream->self_group; 1645 INIT_LIST_HEAD(&substream->self_group.substreams); 1646 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1647 } 1648 1649 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1650 { 1651 struct snd_pcm_substream *s; 1652 int res = 0; 1653 1654 down_write(&snd_pcm_link_rwsem); 1655 write_lock_irq(&snd_pcm_link_rwlock); 1656 if (!snd_pcm_stream_linked(substream)) { 1657 res = -EALREADY; 1658 goto _end; 1659 } 1660 list_del(&substream->link_list); 1661 substream->group->count--; 1662 if (substream->group->count == 1) { /* detach the last stream, too */ 1663 snd_pcm_group_for_each_entry(s, substream) { 1664 relink_to_local(s); 1665 break; 1666 } 1667 kfree(substream->group); 1668 } 1669 relink_to_local(substream); 1670 _end: 1671 write_unlock_irq(&snd_pcm_link_rwlock); 1672 up_write(&snd_pcm_link_rwsem); 1673 return res; 1674 } 1675 1676 /* 1677 * hw configurator 1678 */ 1679 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1680 struct snd_pcm_hw_rule *rule) 1681 { 1682 struct snd_interval t; 1683 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1684 hw_param_interval_c(params, rule->deps[1]), &t); 1685 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1686 } 1687 1688 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1689 struct snd_pcm_hw_rule *rule) 1690 { 1691 struct snd_interval t; 1692 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1693 hw_param_interval_c(params, rule->deps[1]), &t); 1694 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1695 } 1696 1697 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1698 struct snd_pcm_hw_rule *rule) 1699 { 1700 struct snd_interval t; 1701 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1702 hw_param_interval_c(params, rule->deps[1]), 1703 (unsigned long) rule->private, &t); 1704 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1705 } 1706 1707 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1708 struct snd_pcm_hw_rule *rule) 1709 { 1710 struct snd_interval t; 1711 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1712 (unsigned long) rule->private, 1713 hw_param_interval_c(params, rule->deps[1]), &t); 1714 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1715 } 1716 1717 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1718 struct snd_pcm_hw_rule *rule) 1719 { 1720 unsigned int k; 1721 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1722 struct snd_mask m; 1723 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1724 snd_mask_any(&m); 1725 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1726 int bits; 1727 if (! snd_mask_test(mask, k)) 1728 continue; 1729 bits = snd_pcm_format_physical_width(k); 1730 if (bits <= 0) 1731 continue; /* ignore invalid formats */ 1732 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1733 snd_mask_reset(&m, k); 1734 } 1735 return snd_mask_refine(mask, &m); 1736 } 1737 1738 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1739 struct snd_pcm_hw_rule *rule) 1740 { 1741 struct snd_interval t; 1742 unsigned int k; 1743 t.min = UINT_MAX; 1744 t.max = 0; 1745 t.openmin = 0; 1746 t.openmax = 0; 1747 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1748 int bits; 1749 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1750 continue; 1751 bits = snd_pcm_format_physical_width(k); 1752 if (bits <= 0) 1753 continue; /* ignore invalid formats */ 1754 if (t.min > (unsigned)bits) 1755 t.min = bits; 1756 if (t.max < (unsigned)bits) 1757 t.max = bits; 1758 } 1759 t.integer = 1; 1760 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1761 } 1762 1763 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1764 #error "Change this table" 1765 #endif 1766 1767 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1768 48000, 64000, 88200, 96000, 176400, 192000 }; 1769 1770 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1771 .count = ARRAY_SIZE(rates), 1772 .list = rates, 1773 }; 1774 1775 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1776 struct snd_pcm_hw_rule *rule) 1777 { 1778 struct snd_pcm_hardware *hw = rule->private; 1779 return snd_interval_list(hw_param_interval(params, rule->var), 1780 snd_pcm_known_rates.count, 1781 snd_pcm_known_rates.list, hw->rates); 1782 } 1783 1784 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1785 struct snd_pcm_hw_rule *rule) 1786 { 1787 struct snd_interval t; 1788 struct snd_pcm_substream *substream = rule->private; 1789 t.min = 0; 1790 t.max = substream->buffer_bytes_max; 1791 t.openmin = 0; 1792 t.openmax = 0; 1793 t.integer = 1; 1794 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1795 } 1796 1797 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1798 { 1799 struct snd_pcm_runtime *runtime = substream->runtime; 1800 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1801 int k, err; 1802 1803 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1804 snd_mask_any(constrs_mask(constrs, k)); 1805 } 1806 1807 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1808 snd_interval_any(constrs_interval(constrs, k)); 1809 } 1810 1811 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1812 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1813 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1814 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1815 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1816 1817 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1818 snd_pcm_hw_rule_format, NULL, 1819 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1820 if (err < 0) 1821 return err; 1822 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1823 snd_pcm_hw_rule_sample_bits, NULL, 1824 SNDRV_PCM_HW_PARAM_FORMAT, 1825 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1826 if (err < 0) 1827 return err; 1828 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1829 snd_pcm_hw_rule_div, NULL, 1830 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1831 if (err < 0) 1832 return err; 1833 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1834 snd_pcm_hw_rule_mul, NULL, 1835 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1836 if (err < 0) 1837 return err; 1838 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1839 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1840 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1841 if (err < 0) 1842 return err; 1843 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1844 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1845 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 1846 if (err < 0) 1847 return err; 1848 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1849 snd_pcm_hw_rule_div, NULL, 1850 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1851 if (err < 0) 1852 return err; 1853 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1854 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1855 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 1856 if (err < 0) 1857 return err; 1858 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1859 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1860 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 1861 if (err < 0) 1862 return err; 1863 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 1864 snd_pcm_hw_rule_div, NULL, 1865 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1866 if (err < 0) 1867 return err; 1868 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1869 snd_pcm_hw_rule_div, NULL, 1870 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1871 if (err < 0) 1872 return err; 1873 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1874 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1875 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1876 if (err < 0) 1877 return err; 1878 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1879 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1880 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1881 if (err < 0) 1882 return err; 1883 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1884 snd_pcm_hw_rule_mul, NULL, 1885 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1886 if (err < 0) 1887 return err; 1888 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1889 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1890 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1891 if (err < 0) 1892 return err; 1893 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1894 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1895 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1896 if (err < 0) 1897 return err; 1898 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1899 snd_pcm_hw_rule_muldivk, (void*) 8, 1900 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1901 if (err < 0) 1902 return err; 1903 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1904 snd_pcm_hw_rule_muldivk, (void*) 8, 1905 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1906 if (err < 0) 1907 return err; 1908 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1909 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1910 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1911 if (err < 0) 1912 return err; 1913 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 1914 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1915 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1916 if (err < 0) 1917 return err; 1918 return 0; 1919 } 1920 1921 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 1922 { 1923 struct snd_pcm_runtime *runtime = substream->runtime; 1924 struct snd_pcm_hardware *hw = &runtime->hw; 1925 int err; 1926 unsigned int mask = 0; 1927 1928 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1929 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 1930 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1931 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 1932 if (hw->info & SNDRV_PCM_INFO_MMAP) { 1933 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1934 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 1935 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1936 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 1937 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 1938 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 1939 } 1940 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 1941 if (err < 0) 1942 return err; 1943 1944 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 1945 if (err < 0) 1946 return err; 1947 1948 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 1949 if (err < 0) 1950 return err; 1951 1952 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 1953 hw->channels_min, hw->channels_max); 1954 if (err < 0) 1955 return err; 1956 1957 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 1958 hw->rate_min, hw->rate_max); 1959 if (err < 0) 1960 return err; 1961 1962 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1963 hw->period_bytes_min, hw->period_bytes_max); 1964 if (err < 0) 1965 return err; 1966 1967 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 1968 hw->periods_min, hw->periods_max); 1969 if (err < 0) 1970 return err; 1971 1972 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1973 hw->period_bytes_min, hw->buffer_bytes_max); 1974 if (err < 0) 1975 return err; 1976 1977 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1978 snd_pcm_hw_rule_buffer_bytes_max, substream, 1979 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 1980 if (err < 0) 1981 return err; 1982 1983 /* FIXME: remove */ 1984 if (runtime->dma_bytes) { 1985 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 1986 if (err < 0) 1987 return -EINVAL; 1988 } 1989 1990 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 1991 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1992 snd_pcm_hw_rule_rate, hw, 1993 SNDRV_PCM_HW_PARAM_RATE, -1); 1994 if (err < 0) 1995 return err; 1996 } 1997 1998 /* FIXME: this belong to lowlevel */ 1999 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2000 2001 return 0; 2002 } 2003 2004 static void pcm_release_private(struct snd_pcm_substream *substream) 2005 { 2006 snd_pcm_unlink(substream); 2007 } 2008 2009 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2010 { 2011 substream->ref_count--; 2012 if (substream->ref_count > 0) 2013 return; 2014 2015 snd_pcm_drop(substream); 2016 if (substream->hw_opened) { 2017 if (substream->ops->hw_free != NULL) 2018 substream->ops->hw_free(substream); 2019 substream->ops->close(substream); 2020 substream->hw_opened = 0; 2021 } 2022 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2023 pm_qos_remove_request(&substream->latency_pm_qos_req); 2024 if (substream->pcm_release) { 2025 substream->pcm_release(substream); 2026 substream->pcm_release = NULL; 2027 } 2028 snd_pcm_detach_substream(substream); 2029 } 2030 2031 EXPORT_SYMBOL(snd_pcm_release_substream); 2032 2033 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2034 struct file *file, 2035 struct snd_pcm_substream **rsubstream) 2036 { 2037 struct snd_pcm_substream *substream; 2038 int err; 2039 2040 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2041 if (err < 0) 2042 return err; 2043 if (substream->ref_count > 1) { 2044 *rsubstream = substream; 2045 return 0; 2046 } 2047 2048 err = snd_pcm_hw_constraints_init(substream); 2049 if (err < 0) { 2050 snd_printd("snd_pcm_hw_constraints_init failed\n"); 2051 goto error; 2052 } 2053 2054 if ((err = substream->ops->open(substream)) < 0) 2055 goto error; 2056 2057 substream->hw_opened = 1; 2058 2059 err = snd_pcm_hw_constraints_complete(substream); 2060 if (err < 0) { 2061 snd_printd("snd_pcm_hw_constraints_complete failed\n"); 2062 goto error; 2063 } 2064 2065 *rsubstream = substream; 2066 return 0; 2067 2068 error: 2069 snd_pcm_release_substream(substream); 2070 return err; 2071 } 2072 2073 EXPORT_SYMBOL(snd_pcm_open_substream); 2074 2075 static int snd_pcm_open_file(struct file *file, 2076 struct snd_pcm *pcm, 2077 int stream) 2078 { 2079 struct snd_pcm_file *pcm_file; 2080 struct snd_pcm_substream *substream; 2081 int err; 2082 2083 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2084 if (err < 0) 2085 return err; 2086 2087 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2088 if (pcm_file == NULL) { 2089 snd_pcm_release_substream(substream); 2090 return -ENOMEM; 2091 } 2092 pcm_file->substream = substream; 2093 if (substream->ref_count == 1) { 2094 substream->file = pcm_file; 2095 substream->pcm_release = pcm_release_private; 2096 } 2097 file->private_data = pcm_file; 2098 2099 return 0; 2100 } 2101 2102 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2103 { 2104 struct snd_pcm *pcm; 2105 int err = nonseekable_open(inode, file); 2106 if (err < 0) 2107 return err; 2108 pcm = snd_lookup_minor_data(iminor(inode), 2109 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2110 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2111 } 2112 2113 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2114 { 2115 struct snd_pcm *pcm; 2116 int err = nonseekable_open(inode, file); 2117 if (err < 0) 2118 return err; 2119 pcm = snd_lookup_minor_data(iminor(inode), 2120 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2121 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2122 } 2123 2124 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2125 { 2126 int err; 2127 wait_queue_t wait; 2128 2129 if (pcm == NULL) { 2130 err = -ENODEV; 2131 goto __error1; 2132 } 2133 err = snd_card_file_add(pcm->card, file); 2134 if (err < 0) 2135 goto __error1; 2136 if (!try_module_get(pcm->card->module)) { 2137 err = -EFAULT; 2138 goto __error2; 2139 } 2140 init_waitqueue_entry(&wait, current); 2141 add_wait_queue(&pcm->open_wait, &wait); 2142 mutex_lock(&pcm->open_mutex); 2143 while (1) { 2144 err = snd_pcm_open_file(file, pcm, stream); 2145 if (err >= 0) 2146 break; 2147 if (err == -EAGAIN) { 2148 if (file->f_flags & O_NONBLOCK) { 2149 err = -EBUSY; 2150 break; 2151 } 2152 } else 2153 break; 2154 set_current_state(TASK_INTERRUPTIBLE); 2155 mutex_unlock(&pcm->open_mutex); 2156 schedule(); 2157 mutex_lock(&pcm->open_mutex); 2158 if (signal_pending(current)) { 2159 err = -ERESTARTSYS; 2160 break; 2161 } 2162 } 2163 remove_wait_queue(&pcm->open_wait, &wait); 2164 mutex_unlock(&pcm->open_mutex); 2165 if (err < 0) 2166 goto __error; 2167 return err; 2168 2169 __error: 2170 module_put(pcm->card->module); 2171 __error2: 2172 snd_card_file_remove(pcm->card, file); 2173 __error1: 2174 return err; 2175 } 2176 2177 static int snd_pcm_release(struct inode *inode, struct file *file) 2178 { 2179 struct snd_pcm *pcm; 2180 struct snd_pcm_substream *substream; 2181 struct snd_pcm_file *pcm_file; 2182 2183 pcm_file = file->private_data; 2184 substream = pcm_file->substream; 2185 if (snd_BUG_ON(!substream)) 2186 return -ENXIO; 2187 pcm = substream->pcm; 2188 mutex_lock(&pcm->open_mutex); 2189 snd_pcm_release_substream(substream); 2190 kfree(pcm_file); 2191 mutex_unlock(&pcm->open_mutex); 2192 wake_up(&pcm->open_wait); 2193 module_put(pcm->card->module); 2194 snd_card_file_remove(pcm->card, file); 2195 return 0; 2196 } 2197 2198 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2199 snd_pcm_uframes_t frames) 2200 { 2201 struct snd_pcm_runtime *runtime = substream->runtime; 2202 snd_pcm_sframes_t appl_ptr; 2203 snd_pcm_sframes_t ret; 2204 snd_pcm_sframes_t hw_avail; 2205 2206 if (frames == 0) 2207 return 0; 2208 2209 snd_pcm_stream_lock_irq(substream); 2210 switch (runtime->status->state) { 2211 case SNDRV_PCM_STATE_PREPARED: 2212 break; 2213 case SNDRV_PCM_STATE_DRAINING: 2214 case SNDRV_PCM_STATE_RUNNING: 2215 if (snd_pcm_update_hw_ptr(substream) >= 0) 2216 break; 2217 /* Fall through */ 2218 case SNDRV_PCM_STATE_XRUN: 2219 ret = -EPIPE; 2220 goto __end; 2221 case SNDRV_PCM_STATE_SUSPENDED: 2222 ret = -ESTRPIPE; 2223 goto __end; 2224 default: 2225 ret = -EBADFD; 2226 goto __end; 2227 } 2228 2229 hw_avail = snd_pcm_playback_hw_avail(runtime); 2230 if (hw_avail <= 0) { 2231 ret = 0; 2232 goto __end; 2233 } 2234 if (frames > (snd_pcm_uframes_t)hw_avail) 2235 frames = hw_avail; 2236 appl_ptr = runtime->control->appl_ptr - frames; 2237 if (appl_ptr < 0) 2238 appl_ptr += runtime->boundary; 2239 runtime->control->appl_ptr = appl_ptr; 2240 ret = frames; 2241 __end: 2242 snd_pcm_stream_unlock_irq(substream); 2243 return ret; 2244 } 2245 2246 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2247 snd_pcm_uframes_t frames) 2248 { 2249 struct snd_pcm_runtime *runtime = substream->runtime; 2250 snd_pcm_sframes_t appl_ptr; 2251 snd_pcm_sframes_t ret; 2252 snd_pcm_sframes_t hw_avail; 2253 2254 if (frames == 0) 2255 return 0; 2256 2257 snd_pcm_stream_lock_irq(substream); 2258 switch (runtime->status->state) { 2259 case SNDRV_PCM_STATE_PREPARED: 2260 case SNDRV_PCM_STATE_DRAINING: 2261 break; 2262 case SNDRV_PCM_STATE_RUNNING: 2263 if (snd_pcm_update_hw_ptr(substream) >= 0) 2264 break; 2265 /* Fall through */ 2266 case SNDRV_PCM_STATE_XRUN: 2267 ret = -EPIPE; 2268 goto __end; 2269 case SNDRV_PCM_STATE_SUSPENDED: 2270 ret = -ESTRPIPE; 2271 goto __end; 2272 default: 2273 ret = -EBADFD; 2274 goto __end; 2275 } 2276 2277 hw_avail = snd_pcm_capture_hw_avail(runtime); 2278 if (hw_avail <= 0) { 2279 ret = 0; 2280 goto __end; 2281 } 2282 if (frames > (snd_pcm_uframes_t)hw_avail) 2283 frames = hw_avail; 2284 appl_ptr = runtime->control->appl_ptr - frames; 2285 if (appl_ptr < 0) 2286 appl_ptr += runtime->boundary; 2287 runtime->control->appl_ptr = appl_ptr; 2288 ret = frames; 2289 __end: 2290 snd_pcm_stream_unlock_irq(substream); 2291 return ret; 2292 } 2293 2294 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2295 snd_pcm_uframes_t frames) 2296 { 2297 struct snd_pcm_runtime *runtime = substream->runtime; 2298 snd_pcm_sframes_t appl_ptr; 2299 snd_pcm_sframes_t ret; 2300 snd_pcm_sframes_t avail; 2301 2302 if (frames == 0) 2303 return 0; 2304 2305 snd_pcm_stream_lock_irq(substream); 2306 switch (runtime->status->state) { 2307 case SNDRV_PCM_STATE_PREPARED: 2308 case SNDRV_PCM_STATE_PAUSED: 2309 break; 2310 case SNDRV_PCM_STATE_DRAINING: 2311 case SNDRV_PCM_STATE_RUNNING: 2312 if (snd_pcm_update_hw_ptr(substream) >= 0) 2313 break; 2314 /* Fall through */ 2315 case SNDRV_PCM_STATE_XRUN: 2316 ret = -EPIPE; 2317 goto __end; 2318 case SNDRV_PCM_STATE_SUSPENDED: 2319 ret = -ESTRPIPE; 2320 goto __end; 2321 default: 2322 ret = -EBADFD; 2323 goto __end; 2324 } 2325 2326 avail = snd_pcm_playback_avail(runtime); 2327 if (avail <= 0) { 2328 ret = 0; 2329 goto __end; 2330 } 2331 if (frames > (snd_pcm_uframes_t)avail) 2332 frames = avail; 2333 appl_ptr = runtime->control->appl_ptr + frames; 2334 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2335 appl_ptr -= runtime->boundary; 2336 runtime->control->appl_ptr = appl_ptr; 2337 ret = frames; 2338 __end: 2339 snd_pcm_stream_unlock_irq(substream); 2340 return ret; 2341 } 2342 2343 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2344 snd_pcm_uframes_t frames) 2345 { 2346 struct snd_pcm_runtime *runtime = substream->runtime; 2347 snd_pcm_sframes_t appl_ptr; 2348 snd_pcm_sframes_t ret; 2349 snd_pcm_sframes_t avail; 2350 2351 if (frames == 0) 2352 return 0; 2353 2354 snd_pcm_stream_lock_irq(substream); 2355 switch (runtime->status->state) { 2356 case SNDRV_PCM_STATE_PREPARED: 2357 case SNDRV_PCM_STATE_DRAINING: 2358 case SNDRV_PCM_STATE_PAUSED: 2359 break; 2360 case SNDRV_PCM_STATE_RUNNING: 2361 if (snd_pcm_update_hw_ptr(substream) >= 0) 2362 break; 2363 /* Fall through */ 2364 case SNDRV_PCM_STATE_XRUN: 2365 ret = -EPIPE; 2366 goto __end; 2367 case SNDRV_PCM_STATE_SUSPENDED: 2368 ret = -ESTRPIPE; 2369 goto __end; 2370 default: 2371 ret = -EBADFD; 2372 goto __end; 2373 } 2374 2375 avail = snd_pcm_capture_avail(runtime); 2376 if (avail <= 0) { 2377 ret = 0; 2378 goto __end; 2379 } 2380 if (frames > (snd_pcm_uframes_t)avail) 2381 frames = avail; 2382 appl_ptr = runtime->control->appl_ptr + frames; 2383 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2384 appl_ptr -= runtime->boundary; 2385 runtime->control->appl_ptr = appl_ptr; 2386 ret = frames; 2387 __end: 2388 snd_pcm_stream_unlock_irq(substream); 2389 return ret; 2390 } 2391 2392 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2393 { 2394 struct snd_pcm_runtime *runtime = substream->runtime; 2395 int err; 2396 2397 snd_pcm_stream_lock_irq(substream); 2398 switch (runtime->status->state) { 2399 case SNDRV_PCM_STATE_DRAINING: 2400 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2401 goto __badfd; 2402 case SNDRV_PCM_STATE_RUNNING: 2403 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2404 break; 2405 /* Fall through */ 2406 case SNDRV_PCM_STATE_PREPARED: 2407 case SNDRV_PCM_STATE_SUSPENDED: 2408 err = 0; 2409 break; 2410 case SNDRV_PCM_STATE_XRUN: 2411 err = -EPIPE; 2412 break; 2413 default: 2414 __badfd: 2415 err = -EBADFD; 2416 break; 2417 } 2418 snd_pcm_stream_unlock_irq(substream); 2419 return err; 2420 } 2421 2422 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2423 snd_pcm_sframes_t __user *res) 2424 { 2425 struct snd_pcm_runtime *runtime = substream->runtime; 2426 int err; 2427 snd_pcm_sframes_t n = 0; 2428 2429 snd_pcm_stream_lock_irq(substream); 2430 switch (runtime->status->state) { 2431 case SNDRV_PCM_STATE_DRAINING: 2432 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2433 goto __badfd; 2434 case SNDRV_PCM_STATE_RUNNING: 2435 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2436 break; 2437 /* Fall through */ 2438 case SNDRV_PCM_STATE_PREPARED: 2439 case SNDRV_PCM_STATE_SUSPENDED: 2440 err = 0; 2441 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2442 n = snd_pcm_playback_hw_avail(runtime); 2443 else 2444 n = snd_pcm_capture_avail(runtime); 2445 n += runtime->delay; 2446 break; 2447 case SNDRV_PCM_STATE_XRUN: 2448 err = -EPIPE; 2449 break; 2450 default: 2451 __badfd: 2452 err = -EBADFD; 2453 break; 2454 } 2455 snd_pcm_stream_unlock_irq(substream); 2456 if (!err) 2457 if (put_user(n, res)) 2458 err = -EFAULT; 2459 return err; 2460 } 2461 2462 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2463 struct snd_pcm_sync_ptr __user *_sync_ptr) 2464 { 2465 struct snd_pcm_runtime *runtime = substream->runtime; 2466 struct snd_pcm_sync_ptr sync_ptr; 2467 volatile struct snd_pcm_mmap_status *status; 2468 volatile struct snd_pcm_mmap_control *control; 2469 int err; 2470 2471 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2472 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2473 return -EFAULT; 2474 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2475 return -EFAULT; 2476 status = runtime->status; 2477 control = runtime->control; 2478 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2479 err = snd_pcm_hwsync(substream); 2480 if (err < 0) 2481 return err; 2482 } 2483 snd_pcm_stream_lock_irq(substream); 2484 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2485 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2486 else 2487 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2488 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2489 control->avail_min = sync_ptr.c.control.avail_min; 2490 else 2491 sync_ptr.c.control.avail_min = control->avail_min; 2492 sync_ptr.s.status.state = status->state; 2493 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2494 sync_ptr.s.status.tstamp = status->tstamp; 2495 sync_ptr.s.status.suspended_state = status->suspended_state; 2496 snd_pcm_stream_unlock_irq(substream); 2497 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2498 return -EFAULT; 2499 return 0; 2500 } 2501 2502 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2503 { 2504 struct snd_pcm_runtime *runtime = substream->runtime; 2505 int arg; 2506 2507 if (get_user(arg, _arg)) 2508 return -EFAULT; 2509 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2510 return -EINVAL; 2511 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY; 2512 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 2513 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC; 2514 return 0; 2515 } 2516 2517 static int snd_pcm_common_ioctl1(struct file *file, 2518 struct snd_pcm_substream *substream, 2519 unsigned int cmd, void __user *arg) 2520 { 2521 switch (cmd) { 2522 case SNDRV_PCM_IOCTL_PVERSION: 2523 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2524 case SNDRV_PCM_IOCTL_INFO: 2525 return snd_pcm_info_user(substream, arg); 2526 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2527 return 0; 2528 case SNDRV_PCM_IOCTL_TTSTAMP: 2529 return snd_pcm_tstamp(substream, arg); 2530 case SNDRV_PCM_IOCTL_HW_REFINE: 2531 return snd_pcm_hw_refine_user(substream, arg); 2532 case SNDRV_PCM_IOCTL_HW_PARAMS: 2533 return snd_pcm_hw_params_user(substream, arg); 2534 case SNDRV_PCM_IOCTL_HW_FREE: 2535 return snd_pcm_hw_free(substream); 2536 case SNDRV_PCM_IOCTL_SW_PARAMS: 2537 return snd_pcm_sw_params_user(substream, arg); 2538 case SNDRV_PCM_IOCTL_STATUS: 2539 return snd_pcm_status_user(substream, arg); 2540 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2541 return snd_pcm_channel_info_user(substream, arg); 2542 case SNDRV_PCM_IOCTL_PREPARE: 2543 return snd_pcm_prepare(substream, file); 2544 case SNDRV_PCM_IOCTL_RESET: 2545 return snd_pcm_reset(substream); 2546 case SNDRV_PCM_IOCTL_START: 2547 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2548 case SNDRV_PCM_IOCTL_LINK: 2549 return snd_pcm_link(substream, (int)(unsigned long) arg); 2550 case SNDRV_PCM_IOCTL_UNLINK: 2551 return snd_pcm_unlink(substream); 2552 case SNDRV_PCM_IOCTL_RESUME: 2553 return snd_pcm_resume(substream); 2554 case SNDRV_PCM_IOCTL_XRUN: 2555 return snd_pcm_xrun(substream); 2556 case SNDRV_PCM_IOCTL_HWSYNC: 2557 return snd_pcm_hwsync(substream); 2558 case SNDRV_PCM_IOCTL_DELAY: 2559 return snd_pcm_delay(substream, arg); 2560 case SNDRV_PCM_IOCTL_SYNC_PTR: 2561 return snd_pcm_sync_ptr(substream, arg); 2562 #ifdef CONFIG_SND_SUPPORT_OLD_API 2563 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2564 return snd_pcm_hw_refine_old_user(substream, arg); 2565 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2566 return snd_pcm_hw_params_old_user(substream, arg); 2567 #endif 2568 case SNDRV_PCM_IOCTL_DRAIN: 2569 return snd_pcm_drain(substream, file); 2570 case SNDRV_PCM_IOCTL_DROP: 2571 return snd_pcm_drop(substream); 2572 case SNDRV_PCM_IOCTL_PAUSE: 2573 { 2574 int res; 2575 snd_pcm_stream_lock_irq(substream); 2576 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2577 snd_pcm_stream_unlock_irq(substream); 2578 return res; 2579 } 2580 } 2581 snd_printd("unknown ioctl = 0x%x\n", cmd); 2582 return -ENOTTY; 2583 } 2584 2585 static int snd_pcm_playback_ioctl1(struct file *file, 2586 struct snd_pcm_substream *substream, 2587 unsigned int cmd, void __user *arg) 2588 { 2589 if (snd_BUG_ON(!substream)) 2590 return -ENXIO; 2591 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2592 return -EINVAL; 2593 switch (cmd) { 2594 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2595 { 2596 struct snd_xferi xferi; 2597 struct snd_xferi __user *_xferi = arg; 2598 struct snd_pcm_runtime *runtime = substream->runtime; 2599 snd_pcm_sframes_t result; 2600 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2601 return -EBADFD; 2602 if (put_user(0, &_xferi->result)) 2603 return -EFAULT; 2604 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2605 return -EFAULT; 2606 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2607 __put_user(result, &_xferi->result); 2608 return result < 0 ? result : 0; 2609 } 2610 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2611 { 2612 struct snd_xfern xfern; 2613 struct snd_xfern __user *_xfern = arg; 2614 struct snd_pcm_runtime *runtime = substream->runtime; 2615 void __user **bufs; 2616 snd_pcm_sframes_t result; 2617 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2618 return -EBADFD; 2619 if (runtime->channels > 128) 2620 return -EINVAL; 2621 if (put_user(0, &_xfern->result)) 2622 return -EFAULT; 2623 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2624 return -EFAULT; 2625 2626 bufs = memdup_user(xfern.bufs, 2627 sizeof(void *) * runtime->channels); 2628 if (IS_ERR(bufs)) 2629 return PTR_ERR(bufs); 2630 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2631 kfree(bufs); 2632 __put_user(result, &_xfern->result); 2633 return result < 0 ? result : 0; 2634 } 2635 case SNDRV_PCM_IOCTL_REWIND: 2636 { 2637 snd_pcm_uframes_t frames; 2638 snd_pcm_uframes_t __user *_frames = arg; 2639 snd_pcm_sframes_t result; 2640 if (get_user(frames, _frames)) 2641 return -EFAULT; 2642 if (put_user(0, _frames)) 2643 return -EFAULT; 2644 result = snd_pcm_playback_rewind(substream, frames); 2645 __put_user(result, _frames); 2646 return result < 0 ? result : 0; 2647 } 2648 case SNDRV_PCM_IOCTL_FORWARD: 2649 { 2650 snd_pcm_uframes_t frames; 2651 snd_pcm_uframes_t __user *_frames = arg; 2652 snd_pcm_sframes_t result; 2653 if (get_user(frames, _frames)) 2654 return -EFAULT; 2655 if (put_user(0, _frames)) 2656 return -EFAULT; 2657 result = snd_pcm_playback_forward(substream, frames); 2658 __put_user(result, _frames); 2659 return result < 0 ? result : 0; 2660 } 2661 } 2662 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2663 } 2664 2665 static int snd_pcm_capture_ioctl1(struct file *file, 2666 struct snd_pcm_substream *substream, 2667 unsigned int cmd, void __user *arg) 2668 { 2669 if (snd_BUG_ON(!substream)) 2670 return -ENXIO; 2671 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2672 return -EINVAL; 2673 switch (cmd) { 2674 case SNDRV_PCM_IOCTL_READI_FRAMES: 2675 { 2676 struct snd_xferi xferi; 2677 struct snd_xferi __user *_xferi = arg; 2678 struct snd_pcm_runtime *runtime = substream->runtime; 2679 snd_pcm_sframes_t result; 2680 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2681 return -EBADFD; 2682 if (put_user(0, &_xferi->result)) 2683 return -EFAULT; 2684 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2685 return -EFAULT; 2686 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2687 __put_user(result, &_xferi->result); 2688 return result < 0 ? result : 0; 2689 } 2690 case SNDRV_PCM_IOCTL_READN_FRAMES: 2691 { 2692 struct snd_xfern xfern; 2693 struct snd_xfern __user *_xfern = arg; 2694 struct snd_pcm_runtime *runtime = substream->runtime; 2695 void *bufs; 2696 snd_pcm_sframes_t result; 2697 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2698 return -EBADFD; 2699 if (runtime->channels > 128) 2700 return -EINVAL; 2701 if (put_user(0, &_xfern->result)) 2702 return -EFAULT; 2703 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2704 return -EFAULT; 2705 2706 bufs = memdup_user(xfern.bufs, 2707 sizeof(void *) * runtime->channels); 2708 if (IS_ERR(bufs)) 2709 return PTR_ERR(bufs); 2710 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2711 kfree(bufs); 2712 __put_user(result, &_xfern->result); 2713 return result < 0 ? result : 0; 2714 } 2715 case SNDRV_PCM_IOCTL_REWIND: 2716 { 2717 snd_pcm_uframes_t frames; 2718 snd_pcm_uframes_t __user *_frames = arg; 2719 snd_pcm_sframes_t result; 2720 if (get_user(frames, _frames)) 2721 return -EFAULT; 2722 if (put_user(0, _frames)) 2723 return -EFAULT; 2724 result = snd_pcm_capture_rewind(substream, frames); 2725 __put_user(result, _frames); 2726 return result < 0 ? result : 0; 2727 } 2728 case SNDRV_PCM_IOCTL_FORWARD: 2729 { 2730 snd_pcm_uframes_t frames; 2731 snd_pcm_uframes_t __user *_frames = arg; 2732 snd_pcm_sframes_t result; 2733 if (get_user(frames, _frames)) 2734 return -EFAULT; 2735 if (put_user(0, _frames)) 2736 return -EFAULT; 2737 result = snd_pcm_capture_forward(substream, frames); 2738 __put_user(result, _frames); 2739 return result < 0 ? result : 0; 2740 } 2741 } 2742 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2743 } 2744 2745 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2746 unsigned long arg) 2747 { 2748 struct snd_pcm_file *pcm_file; 2749 2750 pcm_file = file->private_data; 2751 2752 if (((cmd >> 8) & 0xff) != 'A') 2753 return -ENOTTY; 2754 2755 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2756 (void __user *)arg); 2757 } 2758 2759 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2760 unsigned long arg) 2761 { 2762 struct snd_pcm_file *pcm_file; 2763 2764 pcm_file = file->private_data; 2765 2766 if (((cmd >> 8) & 0xff) != 'A') 2767 return -ENOTTY; 2768 2769 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2770 (void __user *)arg); 2771 } 2772 2773 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2774 unsigned int cmd, void *arg) 2775 { 2776 mm_segment_t fs; 2777 int result; 2778 2779 fs = snd_enter_user(); 2780 switch (substream->stream) { 2781 case SNDRV_PCM_STREAM_PLAYBACK: 2782 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2783 (void __user *)arg); 2784 break; 2785 case SNDRV_PCM_STREAM_CAPTURE: 2786 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2787 (void __user *)arg); 2788 break; 2789 default: 2790 result = -EINVAL; 2791 break; 2792 } 2793 snd_leave_user(fs); 2794 return result; 2795 } 2796 2797 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2798 2799 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2800 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_read(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_write(struct file *file, const char __user *buf, 2824 size_t count, loff_t * offset) 2825 { 2826 struct snd_pcm_file *pcm_file; 2827 struct snd_pcm_substream *substream; 2828 struct snd_pcm_runtime *runtime; 2829 snd_pcm_sframes_t result; 2830 2831 pcm_file = file->private_data; 2832 substream = pcm_file->substream; 2833 if (PCM_RUNTIME_CHECK(substream)) 2834 return -ENXIO; 2835 runtime = substream->runtime; 2836 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2837 return -EBADFD; 2838 if (!frame_aligned(runtime, count)) 2839 return -EINVAL; 2840 count = bytes_to_frames(runtime, count); 2841 result = snd_pcm_lib_write(substream, buf, count); 2842 if (result > 0) 2843 result = frames_to_bytes(runtime, result); 2844 return result; 2845 } 2846 2847 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 2848 unsigned long nr_segs, loff_t pos) 2849 2850 { 2851 struct snd_pcm_file *pcm_file; 2852 struct snd_pcm_substream *substream; 2853 struct snd_pcm_runtime *runtime; 2854 snd_pcm_sframes_t result; 2855 unsigned long i; 2856 void __user **bufs; 2857 snd_pcm_uframes_t frames; 2858 2859 pcm_file = iocb->ki_filp->private_data; 2860 substream = pcm_file->substream; 2861 if (PCM_RUNTIME_CHECK(substream)) 2862 return -ENXIO; 2863 runtime = substream->runtime; 2864 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2865 return -EBADFD; 2866 if (nr_segs > 1024 || nr_segs != runtime->channels) 2867 return -EINVAL; 2868 if (!frame_aligned(runtime, iov->iov_len)) 2869 return -EINVAL; 2870 frames = bytes_to_samples(runtime, iov->iov_len); 2871 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2872 if (bufs == NULL) 2873 return -ENOMEM; 2874 for (i = 0; i < nr_segs; ++i) 2875 bufs[i] = iov[i].iov_base; 2876 result = snd_pcm_lib_readv(substream, bufs, frames); 2877 if (result > 0) 2878 result = frames_to_bytes(runtime, result); 2879 kfree(bufs); 2880 return result; 2881 } 2882 2883 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 2884 unsigned long nr_segs, loff_t pos) 2885 { 2886 struct snd_pcm_file *pcm_file; 2887 struct snd_pcm_substream *substream; 2888 struct snd_pcm_runtime *runtime; 2889 snd_pcm_sframes_t result; 2890 unsigned long i; 2891 void __user **bufs; 2892 snd_pcm_uframes_t frames; 2893 2894 pcm_file = iocb->ki_filp->private_data; 2895 substream = pcm_file->substream; 2896 if (PCM_RUNTIME_CHECK(substream)) 2897 return -ENXIO; 2898 runtime = substream->runtime; 2899 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2900 return -EBADFD; 2901 if (nr_segs > 128 || nr_segs != runtime->channels || 2902 !frame_aligned(runtime, iov->iov_len)) 2903 return -EINVAL; 2904 frames = bytes_to_samples(runtime, iov->iov_len); 2905 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2906 if (bufs == NULL) 2907 return -ENOMEM; 2908 for (i = 0; i < nr_segs; ++i) 2909 bufs[i] = iov[i].iov_base; 2910 result = snd_pcm_lib_writev(substream, bufs, frames); 2911 if (result > 0) 2912 result = frames_to_bytes(runtime, result); 2913 kfree(bufs); 2914 return result; 2915 } 2916 2917 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 2918 { 2919 struct snd_pcm_file *pcm_file; 2920 struct snd_pcm_substream *substream; 2921 struct snd_pcm_runtime *runtime; 2922 unsigned int mask; 2923 snd_pcm_uframes_t avail; 2924 2925 pcm_file = file->private_data; 2926 2927 substream = pcm_file->substream; 2928 if (PCM_RUNTIME_CHECK(substream)) 2929 return -ENXIO; 2930 runtime = substream->runtime; 2931 2932 poll_wait(file, &runtime->sleep, wait); 2933 2934 snd_pcm_stream_lock_irq(substream); 2935 avail = snd_pcm_playback_avail(runtime); 2936 switch (runtime->status->state) { 2937 case SNDRV_PCM_STATE_RUNNING: 2938 case SNDRV_PCM_STATE_PREPARED: 2939 case SNDRV_PCM_STATE_PAUSED: 2940 if (avail >= runtime->control->avail_min) { 2941 mask = POLLOUT | POLLWRNORM; 2942 break; 2943 } 2944 /* Fall through */ 2945 case SNDRV_PCM_STATE_DRAINING: 2946 mask = 0; 2947 break; 2948 default: 2949 mask = POLLOUT | POLLWRNORM | POLLERR; 2950 break; 2951 } 2952 snd_pcm_stream_unlock_irq(substream); 2953 return mask; 2954 } 2955 2956 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 2957 { 2958 struct snd_pcm_file *pcm_file; 2959 struct snd_pcm_substream *substream; 2960 struct snd_pcm_runtime *runtime; 2961 unsigned int mask; 2962 snd_pcm_uframes_t avail; 2963 2964 pcm_file = file->private_data; 2965 2966 substream = pcm_file->substream; 2967 if (PCM_RUNTIME_CHECK(substream)) 2968 return -ENXIO; 2969 runtime = substream->runtime; 2970 2971 poll_wait(file, &runtime->sleep, wait); 2972 2973 snd_pcm_stream_lock_irq(substream); 2974 avail = snd_pcm_capture_avail(runtime); 2975 switch (runtime->status->state) { 2976 case SNDRV_PCM_STATE_RUNNING: 2977 case SNDRV_PCM_STATE_PREPARED: 2978 case SNDRV_PCM_STATE_PAUSED: 2979 if (avail >= runtime->control->avail_min) { 2980 mask = POLLIN | POLLRDNORM; 2981 break; 2982 } 2983 mask = 0; 2984 break; 2985 case SNDRV_PCM_STATE_DRAINING: 2986 if (avail > 0) { 2987 mask = POLLIN | POLLRDNORM; 2988 break; 2989 } 2990 /* Fall through */ 2991 default: 2992 mask = POLLIN | POLLRDNORM | POLLERR; 2993 break; 2994 } 2995 snd_pcm_stream_unlock_irq(substream); 2996 return mask; 2997 } 2998 2999 /* 3000 * mmap support 3001 */ 3002 3003 /* 3004 * Only on coherent architectures, we can mmap the status and the control records 3005 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3006 */ 3007 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3008 /* 3009 * mmap status record 3010 */ 3011 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 3012 struct vm_fault *vmf) 3013 { 3014 struct snd_pcm_substream *substream = area->vm_private_data; 3015 struct snd_pcm_runtime *runtime; 3016 3017 if (substream == NULL) 3018 return VM_FAULT_SIGBUS; 3019 runtime = substream->runtime; 3020 vmf->page = virt_to_page(runtime->status); 3021 get_page(vmf->page); 3022 return 0; 3023 } 3024 3025 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3026 { 3027 .fault = snd_pcm_mmap_status_fault, 3028 }; 3029 3030 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3031 struct vm_area_struct *area) 3032 { 3033 long size; 3034 if (!(area->vm_flags & VM_READ)) 3035 return -EINVAL; 3036 size = area->vm_end - area->vm_start; 3037 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3038 return -EINVAL; 3039 area->vm_ops = &snd_pcm_vm_ops_status; 3040 area->vm_private_data = substream; 3041 area->vm_flags |= VM_RESERVED; 3042 return 0; 3043 } 3044 3045 /* 3046 * mmap control record 3047 */ 3048 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3049 struct vm_fault *vmf) 3050 { 3051 struct snd_pcm_substream *substream = area->vm_private_data; 3052 struct snd_pcm_runtime *runtime; 3053 3054 if (substream == NULL) 3055 return VM_FAULT_SIGBUS; 3056 runtime = substream->runtime; 3057 vmf->page = virt_to_page(runtime->control); 3058 get_page(vmf->page); 3059 return 0; 3060 } 3061 3062 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3063 { 3064 .fault = snd_pcm_mmap_control_fault, 3065 }; 3066 3067 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3068 struct vm_area_struct *area) 3069 { 3070 long size; 3071 if (!(area->vm_flags & VM_READ)) 3072 return -EINVAL; 3073 size = area->vm_end - area->vm_start; 3074 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3075 return -EINVAL; 3076 area->vm_ops = &snd_pcm_vm_ops_control; 3077 area->vm_private_data = substream; 3078 area->vm_flags |= VM_RESERVED; 3079 return 0; 3080 } 3081 #else /* ! coherent mmap */ 3082 /* 3083 * don't support mmap for status and control records. 3084 */ 3085 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3086 struct vm_area_struct *area) 3087 { 3088 return -ENXIO; 3089 } 3090 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3091 struct vm_area_struct *area) 3092 { 3093 return -ENXIO; 3094 } 3095 #endif /* coherent mmap */ 3096 3097 static inline struct page * 3098 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3099 { 3100 void *vaddr = substream->runtime->dma_area + ofs; 3101 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3102 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3103 return virt_to_page(CAC_ADDR(vaddr)); 3104 #endif 3105 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE) 3106 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) { 3107 dma_addr_t addr = substream->runtime->dma_addr + ofs; 3108 addr -= get_dma_offset(substream->dma_buffer.dev.dev); 3109 /* assume dma_handle set via pfn_to_phys() in 3110 * mm/dma-noncoherent.c 3111 */ 3112 return pfn_to_page(addr >> PAGE_SHIFT); 3113 } 3114 #endif 3115 return virt_to_page(vaddr); 3116 } 3117 3118 /* 3119 * fault callback for mmapping a RAM page 3120 */ 3121 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3122 struct vm_fault *vmf) 3123 { 3124 struct snd_pcm_substream *substream = area->vm_private_data; 3125 struct snd_pcm_runtime *runtime; 3126 unsigned long offset; 3127 struct page * page; 3128 size_t dma_bytes; 3129 3130 if (substream == NULL) 3131 return VM_FAULT_SIGBUS; 3132 runtime = substream->runtime; 3133 offset = vmf->pgoff << PAGE_SHIFT; 3134 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3135 if (offset > dma_bytes - PAGE_SIZE) 3136 return VM_FAULT_SIGBUS; 3137 if (substream->ops->page) 3138 page = substream->ops->page(substream, offset); 3139 else 3140 page = snd_pcm_default_page_ops(substream, offset); 3141 if (!page) 3142 return VM_FAULT_SIGBUS; 3143 get_page(page); 3144 vmf->page = page; 3145 return 0; 3146 } 3147 3148 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3149 .open = snd_pcm_mmap_data_open, 3150 .close = snd_pcm_mmap_data_close, 3151 }; 3152 3153 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3154 .open = snd_pcm_mmap_data_open, 3155 .close = snd_pcm_mmap_data_close, 3156 .fault = snd_pcm_mmap_data_fault, 3157 }; 3158 3159 #ifndef ARCH_HAS_DMA_MMAP_COHERENT 3160 /* This should be defined / handled globally! */ 3161 #ifdef CONFIG_ARM 3162 #define ARCH_HAS_DMA_MMAP_COHERENT 3163 #endif 3164 #endif 3165 3166 /* 3167 * mmap the DMA buffer on RAM 3168 */ 3169 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3170 struct vm_area_struct *area) 3171 { 3172 area->vm_flags |= VM_RESERVED; 3173 #ifdef ARCH_HAS_DMA_MMAP_COHERENT 3174 if (!substream->ops->page && 3175 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3176 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3177 area, 3178 substream->runtime->dma_area, 3179 substream->runtime->dma_addr, 3180 area->vm_end - area->vm_start); 3181 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3182 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV && 3183 !plat_device_is_coherent(substream->dma_buffer.dev.dev)) 3184 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3185 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */ 3186 /* mmap with fault handler */ 3187 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3188 return 0; 3189 } 3190 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3191 3192 /* 3193 * mmap the DMA buffer on I/O memory area 3194 */ 3195 #if SNDRV_PCM_INFO_MMAP_IOMEM 3196 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3197 struct vm_area_struct *area) 3198 { 3199 long size; 3200 unsigned long offset; 3201 3202 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3203 area->vm_flags |= VM_IO; 3204 size = area->vm_end - area->vm_start; 3205 offset = area->vm_pgoff << PAGE_SHIFT; 3206 if (io_remap_pfn_range(area, area->vm_start, 3207 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT, 3208 size, area->vm_page_prot)) 3209 return -EAGAIN; 3210 return 0; 3211 } 3212 3213 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3214 #endif /* SNDRV_PCM_INFO_MMAP */ 3215 3216 /* 3217 * mmap DMA buffer 3218 */ 3219 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3220 struct vm_area_struct *area) 3221 { 3222 struct snd_pcm_runtime *runtime; 3223 long size; 3224 unsigned long offset; 3225 size_t dma_bytes; 3226 int err; 3227 3228 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3229 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3230 return -EINVAL; 3231 } else { 3232 if (!(area->vm_flags & VM_READ)) 3233 return -EINVAL; 3234 } 3235 runtime = substream->runtime; 3236 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3237 return -EBADFD; 3238 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3239 return -ENXIO; 3240 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3241 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3242 return -EINVAL; 3243 size = area->vm_end - area->vm_start; 3244 offset = area->vm_pgoff << PAGE_SHIFT; 3245 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3246 if ((size_t)size > dma_bytes) 3247 return -EINVAL; 3248 if (offset > dma_bytes - size) 3249 return -EINVAL; 3250 3251 area->vm_ops = &snd_pcm_vm_ops_data; 3252 area->vm_private_data = substream; 3253 if (substream->ops->mmap) 3254 err = substream->ops->mmap(substream, area); 3255 else 3256 err = snd_pcm_lib_default_mmap(substream, area); 3257 if (!err) 3258 atomic_inc(&substream->mmap_count); 3259 return err; 3260 } 3261 3262 EXPORT_SYMBOL(snd_pcm_mmap_data); 3263 3264 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3265 { 3266 struct snd_pcm_file * pcm_file; 3267 struct snd_pcm_substream *substream; 3268 unsigned long offset; 3269 3270 pcm_file = file->private_data; 3271 substream = pcm_file->substream; 3272 if (PCM_RUNTIME_CHECK(substream)) 3273 return -ENXIO; 3274 3275 offset = area->vm_pgoff << PAGE_SHIFT; 3276 switch (offset) { 3277 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3278 if (pcm_file->no_compat_mmap) 3279 return -ENXIO; 3280 return snd_pcm_mmap_status(substream, file, area); 3281 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3282 if (pcm_file->no_compat_mmap) 3283 return -ENXIO; 3284 return snd_pcm_mmap_control(substream, file, area); 3285 default: 3286 return snd_pcm_mmap_data(substream, file, area); 3287 } 3288 return 0; 3289 } 3290 3291 static int snd_pcm_fasync(int fd, struct file * file, int on) 3292 { 3293 struct snd_pcm_file * pcm_file; 3294 struct snd_pcm_substream *substream; 3295 struct snd_pcm_runtime *runtime; 3296 3297 pcm_file = file->private_data; 3298 substream = pcm_file->substream; 3299 if (PCM_RUNTIME_CHECK(substream)) 3300 return -ENXIO; 3301 runtime = substream->runtime; 3302 return fasync_helper(fd, file, on, &runtime->fasync); 3303 } 3304 3305 /* 3306 * ioctl32 compat 3307 */ 3308 #ifdef CONFIG_COMPAT 3309 #include "pcm_compat.c" 3310 #else 3311 #define snd_pcm_ioctl_compat NULL 3312 #endif 3313 3314 /* 3315 * To be removed helpers to keep binary compatibility 3316 */ 3317 3318 #ifdef CONFIG_SND_SUPPORT_OLD_API 3319 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3320 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3321 3322 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3323 struct snd_pcm_hw_params_old *oparams) 3324 { 3325 unsigned int i; 3326 3327 memset(params, 0, sizeof(*params)); 3328 params->flags = oparams->flags; 3329 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3330 params->masks[i].bits[0] = oparams->masks[i]; 3331 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3332 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3333 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3334 params->info = oparams->info; 3335 params->msbits = oparams->msbits; 3336 params->rate_num = oparams->rate_num; 3337 params->rate_den = oparams->rate_den; 3338 params->fifo_size = oparams->fifo_size; 3339 } 3340 3341 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3342 struct snd_pcm_hw_params *params) 3343 { 3344 unsigned int i; 3345 3346 memset(oparams, 0, sizeof(*oparams)); 3347 oparams->flags = params->flags; 3348 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3349 oparams->masks[i] = params->masks[i].bits[0]; 3350 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3351 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3352 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3353 oparams->info = params->info; 3354 oparams->msbits = params->msbits; 3355 oparams->rate_num = params->rate_num; 3356 oparams->rate_den = params->rate_den; 3357 oparams->fifo_size = params->fifo_size; 3358 } 3359 3360 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3361 struct snd_pcm_hw_params_old __user * _oparams) 3362 { 3363 struct snd_pcm_hw_params *params; 3364 struct snd_pcm_hw_params_old *oparams = NULL; 3365 int err; 3366 3367 params = kmalloc(sizeof(*params), GFP_KERNEL); 3368 if (!params) 3369 return -ENOMEM; 3370 3371 oparams = memdup_user(_oparams, sizeof(*oparams)); 3372 if (IS_ERR(oparams)) { 3373 err = PTR_ERR(oparams); 3374 goto out; 3375 } 3376 snd_pcm_hw_convert_from_old_params(params, oparams); 3377 err = snd_pcm_hw_refine(substream, params); 3378 snd_pcm_hw_convert_to_old_params(oparams, params); 3379 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3380 if (!err) 3381 err = -EFAULT; 3382 } 3383 3384 kfree(oparams); 3385 out: 3386 kfree(params); 3387 return err; 3388 } 3389 3390 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3391 struct snd_pcm_hw_params_old __user * _oparams) 3392 { 3393 struct snd_pcm_hw_params *params; 3394 struct snd_pcm_hw_params_old *oparams = NULL; 3395 int err; 3396 3397 params = kmalloc(sizeof(*params), GFP_KERNEL); 3398 if (!params) 3399 return -ENOMEM; 3400 3401 oparams = memdup_user(_oparams, sizeof(*oparams)); 3402 if (IS_ERR(oparams)) { 3403 err = PTR_ERR(oparams); 3404 goto out; 3405 } 3406 snd_pcm_hw_convert_from_old_params(params, oparams); 3407 err = snd_pcm_hw_params(substream, params); 3408 snd_pcm_hw_convert_to_old_params(oparams, params); 3409 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3410 if (!err) 3411 err = -EFAULT; 3412 } 3413 3414 kfree(oparams); 3415 out: 3416 kfree(params); 3417 return err; 3418 } 3419 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3420 3421 #ifndef CONFIG_MMU 3422 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3423 unsigned long addr, 3424 unsigned long len, 3425 unsigned long pgoff, 3426 unsigned long flags) 3427 { 3428 struct snd_pcm_file *pcm_file = file->private_data; 3429 struct snd_pcm_substream *substream = pcm_file->substream; 3430 struct snd_pcm_runtime *runtime = substream->runtime; 3431 unsigned long offset = pgoff << PAGE_SHIFT; 3432 3433 switch (offset) { 3434 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3435 return (unsigned long)runtime->status; 3436 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3437 return (unsigned long)runtime->control; 3438 default: 3439 return (unsigned long)runtime->dma_area + offset; 3440 } 3441 } 3442 #else 3443 # define snd_pcm_get_unmapped_area NULL 3444 #endif 3445 3446 /* 3447 * Register section 3448 */ 3449 3450 const struct file_operations snd_pcm_f_ops[2] = { 3451 { 3452 .owner = THIS_MODULE, 3453 .write = snd_pcm_write, 3454 .aio_write = snd_pcm_aio_write, 3455 .open = snd_pcm_playback_open, 3456 .release = snd_pcm_release, 3457 .llseek = no_llseek, 3458 .poll = snd_pcm_playback_poll, 3459 .unlocked_ioctl = snd_pcm_playback_ioctl, 3460 .compat_ioctl = snd_pcm_ioctl_compat, 3461 .mmap = snd_pcm_mmap, 3462 .fasync = snd_pcm_fasync, 3463 .get_unmapped_area = snd_pcm_get_unmapped_area, 3464 }, 3465 { 3466 .owner = THIS_MODULE, 3467 .read = snd_pcm_read, 3468 .aio_read = snd_pcm_aio_read, 3469 .open = snd_pcm_capture_open, 3470 .release = snd_pcm_release, 3471 .llseek = no_llseek, 3472 .poll = snd_pcm_capture_poll, 3473 .unlocked_ioctl = snd_pcm_capture_ioctl, 3474 .compat_ioctl = snd_pcm_ioctl_compat, 3475 .mmap = snd_pcm_mmap, 3476 .fasync = snd_pcm_fasync, 3477 .get_unmapped_area = snd_pcm_get_unmapped_area, 3478 } 3479 }; 3480