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 void snd_pcm_set_state(struct snd_pcm_substream *substream, int state) 373 { 374 snd_pcm_stream_lock_irq(substream); 375 if (substream->runtime->status->state != SNDRV_PCM_STATE_DISCONNECTED) 376 substream->runtime->status->state = state; 377 snd_pcm_stream_unlock_irq(substream); 378 } 379 380 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 381 struct snd_pcm_hw_params *params) 382 { 383 struct snd_pcm_runtime *runtime; 384 int err, usecs; 385 unsigned int bits; 386 snd_pcm_uframes_t frames; 387 388 if (PCM_RUNTIME_CHECK(substream)) 389 return -ENXIO; 390 runtime = substream->runtime; 391 snd_pcm_stream_lock_irq(substream); 392 switch (runtime->status->state) { 393 case SNDRV_PCM_STATE_OPEN: 394 case SNDRV_PCM_STATE_SETUP: 395 case SNDRV_PCM_STATE_PREPARED: 396 break; 397 default: 398 snd_pcm_stream_unlock_irq(substream); 399 return -EBADFD; 400 } 401 snd_pcm_stream_unlock_irq(substream); 402 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 403 if (!substream->oss.oss) 404 #endif 405 if (atomic_read(&substream->mmap_count)) 406 return -EBADFD; 407 408 params->rmask = ~0U; 409 err = snd_pcm_hw_refine(substream, params); 410 if (err < 0) 411 goto _error; 412 413 err = snd_pcm_hw_params_choose(substream, params); 414 if (err < 0) 415 goto _error; 416 417 if (substream->ops->hw_params != NULL) { 418 err = substream->ops->hw_params(substream, params); 419 if (err < 0) 420 goto _error; 421 } 422 423 runtime->access = params_access(params); 424 runtime->format = params_format(params); 425 runtime->subformat = params_subformat(params); 426 runtime->channels = params_channels(params); 427 runtime->rate = params_rate(params); 428 runtime->period_size = params_period_size(params); 429 runtime->periods = params_periods(params); 430 runtime->buffer_size = params_buffer_size(params); 431 runtime->info = params->info; 432 runtime->rate_num = params->rate_num; 433 runtime->rate_den = params->rate_den; 434 runtime->no_period_wakeup = 435 (params->info & SNDRV_PCM_INFO_NO_PERIOD_WAKEUP) && 436 (params->flags & SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP); 437 438 bits = snd_pcm_format_physical_width(runtime->format); 439 runtime->sample_bits = bits; 440 bits *= runtime->channels; 441 runtime->frame_bits = bits; 442 frames = 1; 443 while (bits % 8 != 0) { 444 bits *= 2; 445 frames *= 2; 446 } 447 runtime->byte_align = bits / 8; 448 runtime->min_align = frames; 449 450 /* Default sw params */ 451 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 452 runtime->period_step = 1; 453 runtime->control->avail_min = runtime->period_size; 454 runtime->start_threshold = 1; 455 runtime->stop_threshold = runtime->buffer_size; 456 runtime->silence_threshold = 0; 457 runtime->silence_size = 0; 458 runtime->boundary = runtime->buffer_size; 459 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 460 runtime->boundary *= 2; 461 462 snd_pcm_timer_resolution_change(substream); 463 snd_pcm_set_state(substream, SNDRV_PCM_STATE_SETUP); 464 465 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 466 pm_qos_remove_request(&substream->latency_pm_qos_req); 467 if ((usecs = period_to_usecs(runtime)) >= 0) 468 pm_qos_add_request(&substream->latency_pm_qos_req, 469 PM_QOS_CPU_DMA_LATENCY, usecs); 470 return 0; 471 _error: 472 /* hardware might be unusable from this time, 473 so we force application to retry to set 474 the correct hardware parameter settings */ 475 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 476 if (substream->ops->hw_free != NULL) 477 substream->ops->hw_free(substream); 478 return err; 479 } 480 481 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 482 struct snd_pcm_hw_params __user * _params) 483 { 484 struct snd_pcm_hw_params *params; 485 int err; 486 487 params = memdup_user(_params, sizeof(*params)); 488 if (IS_ERR(params)) 489 return PTR_ERR(params); 490 491 err = snd_pcm_hw_params(substream, params); 492 if (copy_to_user(_params, params, sizeof(*params))) { 493 if (!err) 494 err = -EFAULT; 495 } 496 497 kfree(params); 498 return err; 499 } 500 501 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 502 { 503 struct snd_pcm_runtime *runtime; 504 int result = 0; 505 506 if (PCM_RUNTIME_CHECK(substream)) 507 return -ENXIO; 508 runtime = substream->runtime; 509 snd_pcm_stream_lock_irq(substream); 510 switch (runtime->status->state) { 511 case SNDRV_PCM_STATE_SETUP: 512 case SNDRV_PCM_STATE_PREPARED: 513 break; 514 default: 515 snd_pcm_stream_unlock_irq(substream); 516 return -EBADFD; 517 } 518 snd_pcm_stream_unlock_irq(substream); 519 if (atomic_read(&substream->mmap_count)) 520 return -EBADFD; 521 if (substream->ops->hw_free) 522 result = substream->ops->hw_free(substream); 523 snd_pcm_set_state(substream, SNDRV_PCM_STATE_OPEN); 524 pm_qos_remove_request(&substream->latency_pm_qos_req); 525 return result; 526 } 527 528 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 529 struct snd_pcm_sw_params *params) 530 { 531 struct snd_pcm_runtime *runtime; 532 int err; 533 534 if (PCM_RUNTIME_CHECK(substream)) 535 return -ENXIO; 536 runtime = substream->runtime; 537 snd_pcm_stream_lock_irq(substream); 538 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 539 snd_pcm_stream_unlock_irq(substream); 540 return -EBADFD; 541 } 542 snd_pcm_stream_unlock_irq(substream); 543 544 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 545 return -EINVAL; 546 if (params->avail_min == 0) 547 return -EINVAL; 548 if (params->silence_size >= runtime->boundary) { 549 if (params->silence_threshold != 0) 550 return -EINVAL; 551 } else { 552 if (params->silence_size > params->silence_threshold) 553 return -EINVAL; 554 if (params->silence_threshold > runtime->buffer_size) 555 return -EINVAL; 556 } 557 err = 0; 558 snd_pcm_stream_lock_irq(substream); 559 runtime->tstamp_mode = params->tstamp_mode; 560 runtime->period_step = params->period_step; 561 runtime->control->avail_min = params->avail_min; 562 runtime->start_threshold = params->start_threshold; 563 runtime->stop_threshold = params->stop_threshold; 564 runtime->silence_threshold = params->silence_threshold; 565 runtime->silence_size = params->silence_size; 566 params->boundary = runtime->boundary; 567 if (snd_pcm_running(substream)) { 568 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 569 runtime->silence_size > 0) 570 snd_pcm_playback_silence(substream, ULONG_MAX); 571 err = snd_pcm_update_state(substream, runtime); 572 } 573 snd_pcm_stream_unlock_irq(substream); 574 return err; 575 } 576 577 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 578 struct snd_pcm_sw_params __user * _params) 579 { 580 struct snd_pcm_sw_params params; 581 int err; 582 if (copy_from_user(¶ms, _params, sizeof(params))) 583 return -EFAULT; 584 err = snd_pcm_sw_params(substream, ¶ms); 585 if (copy_to_user(_params, ¶ms, sizeof(params))) 586 return -EFAULT; 587 return err; 588 } 589 590 int snd_pcm_status(struct snd_pcm_substream *substream, 591 struct snd_pcm_status *status) 592 { 593 struct snd_pcm_runtime *runtime = substream->runtime; 594 595 snd_pcm_stream_lock_irq(substream); 596 status->state = runtime->status->state; 597 status->suspended_state = runtime->status->suspended_state; 598 if (status->state == SNDRV_PCM_STATE_OPEN) 599 goto _end; 600 status->trigger_tstamp = runtime->trigger_tstamp; 601 if (snd_pcm_running(substream)) { 602 snd_pcm_update_hw_ptr(substream); 603 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 604 status->tstamp = runtime->status->tstamp; 605 goto _tstamp_end; 606 } 607 } 608 snd_pcm_gettime(runtime, &status->tstamp); 609 _tstamp_end: 610 status->appl_ptr = runtime->control->appl_ptr; 611 status->hw_ptr = runtime->status->hw_ptr; 612 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 613 status->avail = snd_pcm_playback_avail(runtime); 614 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 615 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 616 status->delay = runtime->buffer_size - status->avail; 617 status->delay += runtime->delay; 618 } else 619 status->delay = 0; 620 } else { 621 status->avail = snd_pcm_capture_avail(runtime); 622 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 623 status->delay = status->avail + runtime->delay; 624 else 625 status->delay = 0; 626 } 627 status->avail_max = runtime->avail_max; 628 status->overrange = runtime->overrange; 629 runtime->avail_max = 0; 630 runtime->overrange = 0; 631 _end: 632 snd_pcm_stream_unlock_irq(substream); 633 return 0; 634 } 635 636 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 637 struct snd_pcm_status __user * _status) 638 { 639 struct snd_pcm_status status; 640 int res; 641 642 memset(&status, 0, sizeof(status)); 643 res = snd_pcm_status(substream, &status); 644 if (res < 0) 645 return res; 646 if (copy_to_user(_status, &status, sizeof(status))) 647 return -EFAULT; 648 return 0; 649 } 650 651 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 652 struct snd_pcm_channel_info * info) 653 { 654 struct snd_pcm_runtime *runtime; 655 unsigned int channel; 656 657 channel = info->channel; 658 runtime = substream->runtime; 659 snd_pcm_stream_lock_irq(substream); 660 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 661 snd_pcm_stream_unlock_irq(substream); 662 return -EBADFD; 663 } 664 snd_pcm_stream_unlock_irq(substream); 665 if (channel >= runtime->channels) 666 return -EINVAL; 667 memset(info, 0, sizeof(*info)); 668 info->channel = channel; 669 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 670 } 671 672 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 673 struct snd_pcm_channel_info __user * _info) 674 { 675 struct snd_pcm_channel_info info; 676 int res; 677 678 if (copy_from_user(&info, _info, sizeof(info))) 679 return -EFAULT; 680 res = snd_pcm_channel_info(substream, &info); 681 if (res < 0) 682 return res; 683 if (copy_to_user(_info, &info, sizeof(info))) 684 return -EFAULT; 685 return 0; 686 } 687 688 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 689 { 690 struct snd_pcm_runtime *runtime = substream->runtime; 691 if (runtime->trigger_master == NULL) 692 return; 693 if (runtime->trigger_master == substream) { 694 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 695 } else { 696 snd_pcm_trigger_tstamp(runtime->trigger_master); 697 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 698 } 699 runtime->trigger_master = NULL; 700 } 701 702 struct action_ops { 703 int (*pre_action)(struct snd_pcm_substream *substream, int state); 704 int (*do_action)(struct snd_pcm_substream *substream, int state); 705 void (*undo_action)(struct snd_pcm_substream *substream, int state); 706 void (*post_action)(struct snd_pcm_substream *substream, int state); 707 }; 708 709 /* 710 * this functions is core for handling of linked stream 711 * Note: the stream state might be changed also on failure 712 * Note2: call with calling stream lock + link lock 713 */ 714 static int snd_pcm_action_group(struct action_ops *ops, 715 struct snd_pcm_substream *substream, 716 int state, int do_lock) 717 { 718 struct snd_pcm_substream *s = NULL; 719 struct snd_pcm_substream *s1; 720 int res = 0; 721 722 snd_pcm_group_for_each_entry(s, substream) { 723 if (do_lock && s != substream) 724 spin_lock_nested(&s->self_group.lock, 725 SINGLE_DEPTH_NESTING); 726 res = ops->pre_action(s, state); 727 if (res < 0) 728 goto _unlock; 729 } 730 snd_pcm_group_for_each_entry(s, substream) { 731 res = ops->do_action(s, state); 732 if (res < 0) { 733 if (ops->undo_action) { 734 snd_pcm_group_for_each_entry(s1, substream) { 735 if (s1 == s) /* failed stream */ 736 break; 737 ops->undo_action(s1, state); 738 } 739 } 740 s = NULL; /* unlock all */ 741 goto _unlock; 742 } 743 } 744 snd_pcm_group_for_each_entry(s, substream) { 745 ops->post_action(s, state); 746 } 747 _unlock: 748 if (do_lock) { 749 /* unlock streams */ 750 snd_pcm_group_for_each_entry(s1, substream) { 751 if (s1 != substream) 752 spin_unlock(&s1->self_group.lock); 753 if (s1 == s) /* end */ 754 break; 755 } 756 } 757 return res; 758 } 759 760 /* 761 * Note: call with stream lock 762 */ 763 static int snd_pcm_action_single(struct action_ops *ops, 764 struct snd_pcm_substream *substream, 765 int state) 766 { 767 int res; 768 769 res = ops->pre_action(substream, state); 770 if (res < 0) 771 return res; 772 res = ops->do_action(substream, state); 773 if (res == 0) 774 ops->post_action(substream, state); 775 else if (ops->undo_action) 776 ops->undo_action(substream, state); 777 return res; 778 } 779 780 /* 781 * Note: call with stream lock 782 */ 783 static int snd_pcm_action(struct action_ops *ops, 784 struct snd_pcm_substream *substream, 785 int state) 786 { 787 int res; 788 789 if (snd_pcm_stream_linked(substream)) { 790 if (!spin_trylock(&substream->group->lock)) { 791 spin_unlock(&substream->self_group.lock); 792 spin_lock(&substream->group->lock); 793 spin_lock(&substream->self_group.lock); 794 } 795 res = snd_pcm_action_group(ops, substream, state, 1); 796 spin_unlock(&substream->group->lock); 797 } else { 798 res = snd_pcm_action_single(ops, substream, state); 799 } 800 return res; 801 } 802 803 /* 804 * Note: don't use any locks before 805 */ 806 static int snd_pcm_action_lock_irq(struct action_ops *ops, 807 struct snd_pcm_substream *substream, 808 int state) 809 { 810 int res; 811 812 read_lock_irq(&snd_pcm_link_rwlock); 813 if (snd_pcm_stream_linked(substream)) { 814 spin_lock(&substream->group->lock); 815 spin_lock(&substream->self_group.lock); 816 res = snd_pcm_action_group(ops, substream, state, 1); 817 spin_unlock(&substream->self_group.lock); 818 spin_unlock(&substream->group->lock); 819 } else { 820 spin_lock(&substream->self_group.lock); 821 res = snd_pcm_action_single(ops, substream, state); 822 spin_unlock(&substream->self_group.lock); 823 } 824 read_unlock_irq(&snd_pcm_link_rwlock); 825 return res; 826 } 827 828 /* 829 */ 830 static int snd_pcm_action_nonatomic(struct action_ops *ops, 831 struct snd_pcm_substream *substream, 832 int state) 833 { 834 int res; 835 836 down_read(&snd_pcm_link_rwsem); 837 if (snd_pcm_stream_linked(substream)) 838 res = snd_pcm_action_group(ops, substream, state, 0); 839 else 840 res = snd_pcm_action_single(ops, substream, state); 841 up_read(&snd_pcm_link_rwsem); 842 return res; 843 } 844 845 /* 846 * start callbacks 847 */ 848 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 849 { 850 struct snd_pcm_runtime *runtime = substream->runtime; 851 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 852 return -EBADFD; 853 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 854 !snd_pcm_playback_data(substream)) 855 return -EPIPE; 856 runtime->trigger_master = substream; 857 return 0; 858 } 859 860 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 861 { 862 if (substream->runtime->trigger_master != substream) 863 return 0; 864 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 865 } 866 867 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 868 { 869 if (substream->runtime->trigger_master == substream) 870 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 871 } 872 873 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 874 { 875 struct snd_pcm_runtime *runtime = substream->runtime; 876 snd_pcm_trigger_tstamp(substream); 877 runtime->hw_ptr_jiffies = jiffies; 878 runtime->hw_ptr_buffer_jiffies = (runtime->buffer_size * HZ) / 879 runtime->rate; 880 runtime->status->state = state; 881 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 882 runtime->silence_size > 0) 883 snd_pcm_playback_silence(substream, ULONG_MAX); 884 if (substream->timer) 885 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, 886 &runtime->trigger_tstamp); 887 } 888 889 static struct action_ops snd_pcm_action_start = { 890 .pre_action = snd_pcm_pre_start, 891 .do_action = snd_pcm_do_start, 892 .undo_action = snd_pcm_undo_start, 893 .post_action = snd_pcm_post_start 894 }; 895 896 /** 897 * snd_pcm_start - start all linked streams 898 * @substream: the PCM substream instance 899 */ 900 int snd_pcm_start(struct snd_pcm_substream *substream) 901 { 902 return snd_pcm_action(&snd_pcm_action_start, substream, 903 SNDRV_PCM_STATE_RUNNING); 904 } 905 906 /* 907 * stop callbacks 908 */ 909 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 910 { 911 struct snd_pcm_runtime *runtime = substream->runtime; 912 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 913 return -EBADFD; 914 runtime->trigger_master = substream; 915 return 0; 916 } 917 918 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 919 { 920 if (substream->runtime->trigger_master == substream && 921 snd_pcm_running(substream)) 922 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 923 return 0; /* unconditonally stop all substreams */ 924 } 925 926 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 927 { 928 struct snd_pcm_runtime *runtime = substream->runtime; 929 if (runtime->status->state != state) { 930 snd_pcm_trigger_tstamp(substream); 931 if (substream->timer) 932 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 933 &runtime->trigger_tstamp); 934 runtime->status->state = state; 935 } 936 wake_up(&runtime->sleep); 937 wake_up(&runtime->tsleep); 938 } 939 940 static struct action_ops snd_pcm_action_stop = { 941 .pre_action = snd_pcm_pre_stop, 942 .do_action = snd_pcm_do_stop, 943 .post_action = snd_pcm_post_stop 944 }; 945 946 /** 947 * snd_pcm_stop - try to stop all running streams in the substream group 948 * @substream: the PCM substream instance 949 * @state: PCM state after stopping the stream 950 * 951 * The state of each stream is then changed to the given state unconditionally. 952 */ 953 int snd_pcm_stop(struct snd_pcm_substream *substream, snd_pcm_state_t state) 954 { 955 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 956 } 957 958 EXPORT_SYMBOL(snd_pcm_stop); 959 960 /** 961 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 962 * @substream: the PCM substream 963 * 964 * After stopping, the state is changed to SETUP. 965 * Unlike snd_pcm_stop(), this affects only the given stream. 966 */ 967 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 968 { 969 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 970 SNDRV_PCM_STATE_SETUP); 971 } 972 973 /* 974 * pause callbacks 975 */ 976 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 977 { 978 struct snd_pcm_runtime *runtime = substream->runtime; 979 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 980 return -ENOSYS; 981 if (push) { 982 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 983 return -EBADFD; 984 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 985 return -EBADFD; 986 runtime->trigger_master = substream; 987 return 0; 988 } 989 990 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 991 { 992 if (substream->runtime->trigger_master != substream) 993 return 0; 994 /* some drivers might use hw_ptr to recover from the pause - 995 update the hw_ptr now */ 996 if (push) 997 snd_pcm_update_hw_ptr(substream); 998 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 999 * a delta between the current jiffies, this gives a large enough 1000 * delta, effectively to skip the check once. 1001 */ 1002 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 1003 return substream->ops->trigger(substream, 1004 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 1005 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 1006 } 1007 1008 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1009 { 1010 if (substream->runtime->trigger_master == substream) 1011 substream->ops->trigger(substream, 1012 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1013 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1014 } 1015 1016 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1017 { 1018 struct snd_pcm_runtime *runtime = substream->runtime; 1019 snd_pcm_trigger_tstamp(substream); 1020 if (push) { 1021 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1022 if (substream->timer) 1023 snd_timer_notify(substream->timer, 1024 SNDRV_TIMER_EVENT_MPAUSE, 1025 &runtime->trigger_tstamp); 1026 wake_up(&runtime->sleep); 1027 wake_up(&runtime->tsleep); 1028 } else { 1029 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1030 if (substream->timer) 1031 snd_timer_notify(substream->timer, 1032 SNDRV_TIMER_EVENT_MCONTINUE, 1033 &runtime->trigger_tstamp); 1034 } 1035 } 1036 1037 static struct action_ops snd_pcm_action_pause = { 1038 .pre_action = snd_pcm_pre_pause, 1039 .do_action = snd_pcm_do_pause, 1040 .undo_action = snd_pcm_undo_pause, 1041 .post_action = snd_pcm_post_pause 1042 }; 1043 1044 /* 1045 * Push/release the pause for all linked streams. 1046 */ 1047 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1048 { 1049 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1050 } 1051 1052 #ifdef CONFIG_PM 1053 /* suspend */ 1054 1055 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1056 { 1057 struct snd_pcm_runtime *runtime = substream->runtime; 1058 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1059 return -EBUSY; 1060 runtime->trigger_master = substream; 1061 return 0; 1062 } 1063 1064 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1065 { 1066 struct snd_pcm_runtime *runtime = substream->runtime; 1067 if (runtime->trigger_master != substream) 1068 return 0; 1069 if (! snd_pcm_running(substream)) 1070 return 0; 1071 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1072 return 0; /* suspend unconditionally */ 1073 } 1074 1075 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1076 { 1077 struct snd_pcm_runtime *runtime = substream->runtime; 1078 snd_pcm_trigger_tstamp(substream); 1079 if (substream->timer) 1080 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1081 &runtime->trigger_tstamp); 1082 runtime->status->suspended_state = runtime->status->state; 1083 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1084 wake_up(&runtime->sleep); 1085 wake_up(&runtime->tsleep); 1086 } 1087 1088 static struct action_ops snd_pcm_action_suspend = { 1089 .pre_action = snd_pcm_pre_suspend, 1090 .do_action = snd_pcm_do_suspend, 1091 .post_action = snd_pcm_post_suspend 1092 }; 1093 1094 /** 1095 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1096 * @substream: the PCM substream 1097 * 1098 * After this call, all streams are changed to SUSPENDED state. 1099 */ 1100 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1101 { 1102 int err; 1103 unsigned long flags; 1104 1105 if (! substream) 1106 return 0; 1107 1108 snd_pcm_stream_lock_irqsave(substream, flags); 1109 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1110 snd_pcm_stream_unlock_irqrestore(substream, flags); 1111 return err; 1112 } 1113 1114 EXPORT_SYMBOL(snd_pcm_suspend); 1115 1116 /** 1117 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1118 * @pcm: the PCM instance 1119 * 1120 * After this call, all streams are changed to SUSPENDED state. 1121 */ 1122 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1123 { 1124 struct snd_pcm_substream *substream; 1125 int stream, err = 0; 1126 1127 if (! pcm) 1128 return 0; 1129 1130 for (stream = 0; stream < 2; stream++) { 1131 for (substream = pcm->streams[stream].substream; 1132 substream; substream = substream->next) { 1133 /* FIXME: the open/close code should lock this as well */ 1134 if (substream->runtime == NULL) 1135 continue; 1136 err = snd_pcm_suspend(substream); 1137 if (err < 0 && err != -EBUSY) 1138 return err; 1139 } 1140 } 1141 return 0; 1142 } 1143 1144 EXPORT_SYMBOL(snd_pcm_suspend_all); 1145 1146 /* resume */ 1147 1148 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1149 { 1150 struct snd_pcm_runtime *runtime = substream->runtime; 1151 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1152 return -ENOSYS; 1153 runtime->trigger_master = substream; 1154 return 0; 1155 } 1156 1157 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1158 { 1159 struct snd_pcm_runtime *runtime = substream->runtime; 1160 if (runtime->trigger_master != substream) 1161 return 0; 1162 /* DMA not running previously? */ 1163 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1164 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1165 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1166 return 0; 1167 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1168 } 1169 1170 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1171 { 1172 if (substream->runtime->trigger_master == substream && 1173 snd_pcm_running(substream)) 1174 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1175 } 1176 1177 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1178 { 1179 struct snd_pcm_runtime *runtime = substream->runtime; 1180 snd_pcm_trigger_tstamp(substream); 1181 if (substream->timer) 1182 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1183 &runtime->trigger_tstamp); 1184 runtime->status->state = runtime->status->suspended_state; 1185 } 1186 1187 static struct action_ops snd_pcm_action_resume = { 1188 .pre_action = snd_pcm_pre_resume, 1189 .do_action = snd_pcm_do_resume, 1190 .undo_action = snd_pcm_undo_resume, 1191 .post_action = snd_pcm_post_resume 1192 }; 1193 1194 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1195 { 1196 struct snd_card *card = substream->pcm->card; 1197 int res; 1198 1199 snd_power_lock(card); 1200 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1201 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1202 snd_power_unlock(card); 1203 return res; 1204 } 1205 1206 #else 1207 1208 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1209 { 1210 return -ENOSYS; 1211 } 1212 1213 #endif /* CONFIG_PM */ 1214 1215 /* 1216 * xrun ioctl 1217 * 1218 * Change the RUNNING stream(s) to XRUN state. 1219 */ 1220 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1221 { 1222 struct snd_card *card = substream->pcm->card; 1223 struct snd_pcm_runtime *runtime = substream->runtime; 1224 int result; 1225 1226 snd_power_lock(card); 1227 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1228 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1229 if (result < 0) 1230 goto _unlock; 1231 } 1232 1233 snd_pcm_stream_lock_irq(substream); 1234 switch (runtime->status->state) { 1235 case SNDRV_PCM_STATE_XRUN: 1236 result = 0; /* already there */ 1237 break; 1238 case SNDRV_PCM_STATE_RUNNING: 1239 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1240 break; 1241 default: 1242 result = -EBADFD; 1243 } 1244 snd_pcm_stream_unlock_irq(substream); 1245 _unlock: 1246 snd_power_unlock(card); 1247 return result; 1248 } 1249 1250 /* 1251 * reset ioctl 1252 */ 1253 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1254 { 1255 struct snd_pcm_runtime *runtime = substream->runtime; 1256 switch (runtime->status->state) { 1257 case SNDRV_PCM_STATE_RUNNING: 1258 case SNDRV_PCM_STATE_PREPARED: 1259 case SNDRV_PCM_STATE_PAUSED: 1260 case SNDRV_PCM_STATE_SUSPENDED: 1261 return 0; 1262 default: 1263 return -EBADFD; 1264 } 1265 } 1266 1267 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1268 { 1269 struct snd_pcm_runtime *runtime = substream->runtime; 1270 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1271 if (err < 0) 1272 return err; 1273 runtime->hw_ptr_base = 0; 1274 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1275 runtime->status->hw_ptr % runtime->period_size; 1276 runtime->silence_start = runtime->status->hw_ptr; 1277 runtime->silence_filled = 0; 1278 return 0; 1279 } 1280 1281 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1282 { 1283 struct snd_pcm_runtime *runtime = substream->runtime; 1284 runtime->control->appl_ptr = runtime->status->hw_ptr; 1285 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1286 runtime->silence_size > 0) 1287 snd_pcm_playback_silence(substream, ULONG_MAX); 1288 } 1289 1290 static struct action_ops snd_pcm_action_reset = { 1291 .pre_action = snd_pcm_pre_reset, 1292 .do_action = snd_pcm_do_reset, 1293 .post_action = snd_pcm_post_reset 1294 }; 1295 1296 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1297 { 1298 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1299 } 1300 1301 /* 1302 * prepare ioctl 1303 */ 1304 /* we use the second argument for updating f_flags */ 1305 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1306 int f_flags) 1307 { 1308 struct snd_pcm_runtime *runtime = substream->runtime; 1309 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1310 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1311 return -EBADFD; 1312 if (snd_pcm_running(substream)) 1313 return -EBUSY; 1314 substream->f_flags = f_flags; 1315 return 0; 1316 } 1317 1318 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1319 { 1320 int err; 1321 err = substream->ops->prepare(substream); 1322 if (err < 0) 1323 return err; 1324 return snd_pcm_do_reset(substream, 0); 1325 } 1326 1327 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1328 { 1329 struct snd_pcm_runtime *runtime = substream->runtime; 1330 runtime->control->appl_ptr = runtime->status->hw_ptr; 1331 snd_pcm_set_state(substream, SNDRV_PCM_STATE_PREPARED); 1332 } 1333 1334 static struct action_ops snd_pcm_action_prepare = { 1335 .pre_action = snd_pcm_pre_prepare, 1336 .do_action = snd_pcm_do_prepare, 1337 .post_action = snd_pcm_post_prepare 1338 }; 1339 1340 /** 1341 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1342 * @substream: the PCM substream instance 1343 * @file: file to refer f_flags 1344 */ 1345 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1346 struct file *file) 1347 { 1348 int res; 1349 struct snd_card *card = substream->pcm->card; 1350 int f_flags; 1351 1352 if (file) 1353 f_flags = file->f_flags; 1354 else 1355 f_flags = substream->f_flags; 1356 1357 snd_power_lock(card); 1358 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1359 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1360 substream, f_flags); 1361 snd_power_unlock(card); 1362 return res; 1363 } 1364 1365 /* 1366 * drain ioctl 1367 */ 1368 1369 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1370 { 1371 struct snd_pcm_runtime *runtime = substream->runtime; 1372 switch (runtime->status->state) { 1373 case SNDRV_PCM_STATE_OPEN: 1374 case SNDRV_PCM_STATE_DISCONNECTED: 1375 case SNDRV_PCM_STATE_SUSPENDED: 1376 return -EBADFD; 1377 } 1378 runtime->trigger_master = substream; 1379 return 0; 1380 } 1381 1382 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1383 { 1384 struct snd_pcm_runtime *runtime = substream->runtime; 1385 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1386 switch (runtime->status->state) { 1387 case SNDRV_PCM_STATE_PREPARED: 1388 /* start playback stream if possible */ 1389 if (! snd_pcm_playback_empty(substream)) { 1390 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1391 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1392 } 1393 break; 1394 case SNDRV_PCM_STATE_RUNNING: 1395 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1396 break; 1397 case SNDRV_PCM_STATE_XRUN: 1398 runtime->status->state = SNDRV_PCM_STATE_SETUP; 1399 break; 1400 default: 1401 break; 1402 } 1403 } else { 1404 /* stop running stream */ 1405 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1406 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1407 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1408 snd_pcm_do_stop(substream, new_state); 1409 snd_pcm_post_stop(substream, new_state); 1410 } 1411 } 1412 return 0; 1413 } 1414 1415 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1416 { 1417 } 1418 1419 static struct action_ops snd_pcm_action_drain_init = { 1420 .pre_action = snd_pcm_pre_drain_init, 1421 .do_action = snd_pcm_do_drain_init, 1422 .post_action = snd_pcm_post_drain_init 1423 }; 1424 1425 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1426 1427 /* 1428 * Drain the stream(s). 1429 * When the substream is linked, sync until the draining of all playback streams 1430 * is finished. 1431 * After this call, all streams are supposed to be either SETUP or DRAINING 1432 * (capture only) state. 1433 */ 1434 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1435 struct file *file) 1436 { 1437 struct snd_card *card; 1438 struct snd_pcm_runtime *runtime; 1439 struct snd_pcm_substream *s; 1440 wait_queue_t wait; 1441 int result = 0; 1442 int nonblock = 0; 1443 1444 card = substream->pcm->card; 1445 runtime = substream->runtime; 1446 1447 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1448 return -EBADFD; 1449 1450 snd_power_lock(card); 1451 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1452 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1453 if (result < 0) { 1454 snd_power_unlock(card); 1455 return result; 1456 } 1457 } 1458 1459 if (file) { 1460 if (file->f_flags & O_NONBLOCK) 1461 nonblock = 1; 1462 } else if (substream->f_flags & O_NONBLOCK) 1463 nonblock = 1; 1464 1465 down_read(&snd_pcm_link_rwsem); 1466 snd_pcm_stream_lock_irq(substream); 1467 /* resume pause */ 1468 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1469 snd_pcm_pause(substream, 0); 1470 1471 /* pre-start/stop - all running streams are changed to DRAINING state */ 1472 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1473 if (result < 0) 1474 goto unlock; 1475 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1476 if (nonblock) { 1477 result = -EAGAIN; 1478 goto unlock; 1479 } 1480 1481 for (;;) { 1482 long tout; 1483 struct snd_pcm_runtime *to_check; 1484 if (signal_pending(current)) { 1485 result = -ERESTARTSYS; 1486 break; 1487 } 1488 /* find a substream to drain */ 1489 to_check = NULL; 1490 snd_pcm_group_for_each_entry(s, substream) { 1491 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1492 continue; 1493 runtime = s->runtime; 1494 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1495 to_check = runtime; 1496 break; 1497 } 1498 } 1499 if (!to_check) 1500 break; /* all drained */ 1501 init_waitqueue_entry(&wait, current); 1502 add_wait_queue(&to_check->sleep, &wait); 1503 snd_pcm_stream_unlock_irq(substream); 1504 up_read(&snd_pcm_link_rwsem); 1505 snd_power_unlock(card); 1506 if (runtime->no_period_wakeup) 1507 tout = MAX_SCHEDULE_TIMEOUT; 1508 else { 1509 tout = 10; 1510 if (runtime->rate) { 1511 long t = runtime->period_size * 2 / runtime->rate; 1512 tout = max(t, tout); 1513 } 1514 tout = msecs_to_jiffies(tout * 1000); 1515 } 1516 tout = schedule_timeout_interruptible(tout); 1517 snd_power_lock(card); 1518 down_read(&snd_pcm_link_rwsem); 1519 snd_pcm_stream_lock_irq(substream); 1520 remove_wait_queue(&to_check->sleep, &wait); 1521 if (card->shutdown) { 1522 result = -ENODEV; 1523 break; 1524 } 1525 if (tout == 0) { 1526 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1527 result = -ESTRPIPE; 1528 else { 1529 snd_printd("playback drain error (DMA or IRQ trouble?)\n"); 1530 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1531 result = -EIO; 1532 } 1533 break; 1534 } 1535 } 1536 1537 unlock: 1538 snd_pcm_stream_unlock_irq(substream); 1539 up_read(&snd_pcm_link_rwsem); 1540 snd_power_unlock(card); 1541 1542 return result; 1543 } 1544 1545 /* 1546 * drop ioctl 1547 * 1548 * Immediately put all linked substreams into SETUP state. 1549 */ 1550 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1551 { 1552 struct snd_pcm_runtime *runtime; 1553 int result = 0; 1554 1555 if (PCM_RUNTIME_CHECK(substream)) 1556 return -ENXIO; 1557 runtime = substream->runtime; 1558 1559 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1560 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1561 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1562 return -EBADFD; 1563 1564 snd_pcm_stream_lock_irq(substream); 1565 /* resume pause */ 1566 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1567 snd_pcm_pause(substream, 0); 1568 1569 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1570 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1571 snd_pcm_stream_unlock_irq(substream); 1572 1573 return result; 1574 } 1575 1576 1577 /* WARNING: Don't forget to fput back the file */ 1578 static struct file *snd_pcm_file_fd(int fd, int *fput_needed) 1579 { 1580 struct file *file; 1581 struct inode *inode; 1582 unsigned int minor; 1583 1584 file = fget_light(fd, fput_needed); 1585 if (!file) 1586 return NULL; 1587 inode = file->f_path.dentry->d_inode; 1588 if (!S_ISCHR(inode->i_mode) || 1589 imajor(inode) != snd_major) { 1590 fput_light(file, *fput_needed); 1591 return NULL; 1592 } 1593 minor = iminor(inode); 1594 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) && 1595 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) { 1596 fput_light(file, *fput_needed); 1597 return NULL; 1598 } 1599 return file; 1600 } 1601 1602 /* 1603 * PCM link handling 1604 */ 1605 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1606 { 1607 int res = 0; 1608 struct file *file; 1609 struct snd_pcm_file *pcm_file; 1610 struct snd_pcm_substream *substream1; 1611 struct snd_pcm_group *group; 1612 int fput_needed; 1613 1614 file = snd_pcm_file_fd(fd, &fput_needed); 1615 if (!file) 1616 return -EBADFD; 1617 pcm_file = file->private_data; 1618 substream1 = pcm_file->substream; 1619 group = kmalloc(sizeof(*group), GFP_KERNEL); 1620 if (!group) { 1621 res = -ENOMEM; 1622 goto _nolock; 1623 } 1624 down_write(&snd_pcm_link_rwsem); 1625 write_lock_irq(&snd_pcm_link_rwlock); 1626 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1627 substream->runtime->status->state != substream1->runtime->status->state) { 1628 res = -EBADFD; 1629 goto _end; 1630 } 1631 if (snd_pcm_stream_linked(substream1)) { 1632 res = -EALREADY; 1633 goto _end; 1634 } 1635 if (!snd_pcm_stream_linked(substream)) { 1636 substream->group = group; 1637 spin_lock_init(&substream->group->lock); 1638 INIT_LIST_HEAD(&substream->group->substreams); 1639 list_add_tail(&substream->link_list, &substream->group->substreams); 1640 substream->group->count = 1; 1641 } 1642 list_add_tail(&substream1->link_list, &substream->group->substreams); 1643 substream->group->count++; 1644 substream1->group = substream->group; 1645 _end: 1646 write_unlock_irq(&snd_pcm_link_rwlock); 1647 up_write(&snd_pcm_link_rwsem); 1648 _nolock: 1649 snd_card_unref(substream1->pcm->card); 1650 fput_light(file, fput_needed); 1651 if (res < 0) 1652 kfree(group); 1653 return res; 1654 } 1655 1656 static void relink_to_local(struct snd_pcm_substream *substream) 1657 { 1658 substream->group = &substream->self_group; 1659 INIT_LIST_HEAD(&substream->self_group.substreams); 1660 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1661 } 1662 1663 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1664 { 1665 struct snd_pcm_substream *s; 1666 int res = 0; 1667 1668 down_write(&snd_pcm_link_rwsem); 1669 write_lock_irq(&snd_pcm_link_rwlock); 1670 if (!snd_pcm_stream_linked(substream)) { 1671 res = -EALREADY; 1672 goto _end; 1673 } 1674 list_del(&substream->link_list); 1675 substream->group->count--; 1676 if (substream->group->count == 1) { /* detach the last stream, too */ 1677 snd_pcm_group_for_each_entry(s, substream) { 1678 relink_to_local(s); 1679 break; 1680 } 1681 kfree(substream->group); 1682 } 1683 relink_to_local(substream); 1684 _end: 1685 write_unlock_irq(&snd_pcm_link_rwlock); 1686 up_write(&snd_pcm_link_rwsem); 1687 return res; 1688 } 1689 1690 /* 1691 * hw configurator 1692 */ 1693 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1694 struct snd_pcm_hw_rule *rule) 1695 { 1696 struct snd_interval t; 1697 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1698 hw_param_interval_c(params, rule->deps[1]), &t); 1699 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1700 } 1701 1702 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1703 struct snd_pcm_hw_rule *rule) 1704 { 1705 struct snd_interval t; 1706 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1707 hw_param_interval_c(params, rule->deps[1]), &t); 1708 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1709 } 1710 1711 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1712 struct snd_pcm_hw_rule *rule) 1713 { 1714 struct snd_interval t; 1715 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1716 hw_param_interval_c(params, rule->deps[1]), 1717 (unsigned long) rule->private, &t); 1718 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1719 } 1720 1721 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1722 struct snd_pcm_hw_rule *rule) 1723 { 1724 struct snd_interval t; 1725 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1726 (unsigned long) rule->private, 1727 hw_param_interval_c(params, rule->deps[1]), &t); 1728 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1729 } 1730 1731 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1732 struct snd_pcm_hw_rule *rule) 1733 { 1734 unsigned int k; 1735 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1736 struct snd_mask m; 1737 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1738 snd_mask_any(&m); 1739 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1740 int bits; 1741 if (! snd_mask_test(mask, k)) 1742 continue; 1743 bits = snd_pcm_format_physical_width(k); 1744 if (bits <= 0) 1745 continue; /* ignore invalid formats */ 1746 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1747 snd_mask_reset(&m, k); 1748 } 1749 return snd_mask_refine(mask, &m); 1750 } 1751 1752 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1753 struct snd_pcm_hw_rule *rule) 1754 { 1755 struct snd_interval t; 1756 unsigned int k; 1757 t.min = UINT_MAX; 1758 t.max = 0; 1759 t.openmin = 0; 1760 t.openmax = 0; 1761 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1762 int bits; 1763 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1764 continue; 1765 bits = snd_pcm_format_physical_width(k); 1766 if (bits <= 0) 1767 continue; /* ignore invalid formats */ 1768 if (t.min > (unsigned)bits) 1769 t.min = bits; 1770 if (t.max < (unsigned)bits) 1771 t.max = bits; 1772 } 1773 t.integer = 1; 1774 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1775 } 1776 1777 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1778 #error "Change this table" 1779 #endif 1780 1781 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1782 48000, 64000, 88200, 96000, 176400, 192000 }; 1783 1784 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1785 .count = ARRAY_SIZE(rates), 1786 .list = rates, 1787 }; 1788 1789 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1790 struct snd_pcm_hw_rule *rule) 1791 { 1792 struct snd_pcm_hardware *hw = rule->private; 1793 return snd_interval_list(hw_param_interval(params, rule->var), 1794 snd_pcm_known_rates.count, 1795 snd_pcm_known_rates.list, hw->rates); 1796 } 1797 1798 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1799 struct snd_pcm_hw_rule *rule) 1800 { 1801 struct snd_interval t; 1802 struct snd_pcm_substream *substream = rule->private; 1803 t.min = 0; 1804 t.max = substream->buffer_bytes_max; 1805 t.openmin = 0; 1806 t.openmax = 0; 1807 t.integer = 1; 1808 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1809 } 1810 1811 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1812 { 1813 struct snd_pcm_runtime *runtime = substream->runtime; 1814 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1815 int k, err; 1816 1817 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1818 snd_mask_any(constrs_mask(constrs, k)); 1819 } 1820 1821 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1822 snd_interval_any(constrs_interval(constrs, k)); 1823 } 1824 1825 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1826 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1827 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1828 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1829 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1830 1831 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1832 snd_pcm_hw_rule_format, NULL, 1833 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1834 if (err < 0) 1835 return err; 1836 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1837 snd_pcm_hw_rule_sample_bits, NULL, 1838 SNDRV_PCM_HW_PARAM_FORMAT, 1839 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1840 if (err < 0) 1841 return err; 1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1843 snd_pcm_hw_rule_div, NULL, 1844 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1845 if (err < 0) 1846 return err; 1847 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1848 snd_pcm_hw_rule_mul, NULL, 1849 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1850 if (err < 0) 1851 return err; 1852 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1853 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1854 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1855 if (err < 0) 1856 return err; 1857 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1858 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1859 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 1860 if (err < 0) 1861 return err; 1862 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1863 snd_pcm_hw_rule_div, NULL, 1864 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1865 if (err < 0) 1866 return err; 1867 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1868 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1869 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 1870 if (err < 0) 1871 return err; 1872 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1873 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1874 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 1875 if (err < 0) 1876 return err; 1877 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 1878 snd_pcm_hw_rule_div, NULL, 1879 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1880 if (err < 0) 1881 return err; 1882 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1883 snd_pcm_hw_rule_div, NULL, 1884 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1885 if (err < 0) 1886 return err; 1887 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1888 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1889 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1890 if (err < 0) 1891 return err; 1892 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1893 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1894 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1895 if (err < 0) 1896 return err; 1897 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1898 snd_pcm_hw_rule_mul, NULL, 1899 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1900 if (err < 0) 1901 return err; 1902 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1903 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1904 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1905 if (err < 0) 1906 return err; 1907 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1908 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1909 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1910 if (err < 0) 1911 return err; 1912 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1913 snd_pcm_hw_rule_muldivk, (void*) 8, 1914 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1915 if (err < 0) 1916 return err; 1917 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1918 snd_pcm_hw_rule_muldivk, (void*) 8, 1919 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1920 if (err < 0) 1921 return err; 1922 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1923 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1924 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1925 if (err < 0) 1926 return err; 1927 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 1928 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1929 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1930 if (err < 0) 1931 return err; 1932 return 0; 1933 } 1934 1935 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 1936 { 1937 struct snd_pcm_runtime *runtime = substream->runtime; 1938 struct snd_pcm_hardware *hw = &runtime->hw; 1939 int err; 1940 unsigned int mask = 0; 1941 1942 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1943 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 1944 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1945 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 1946 if (hw->info & SNDRV_PCM_INFO_MMAP) { 1947 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1948 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 1949 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1950 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 1951 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 1952 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 1953 } 1954 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 1955 if (err < 0) 1956 return err; 1957 1958 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 1959 if (err < 0) 1960 return err; 1961 1962 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 1963 if (err < 0) 1964 return err; 1965 1966 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 1967 hw->channels_min, hw->channels_max); 1968 if (err < 0) 1969 return err; 1970 1971 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 1972 hw->rate_min, hw->rate_max); 1973 if (err < 0) 1974 return err; 1975 1976 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1977 hw->period_bytes_min, hw->period_bytes_max); 1978 if (err < 0) 1979 return err; 1980 1981 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 1982 hw->periods_min, hw->periods_max); 1983 if (err < 0) 1984 return err; 1985 1986 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1987 hw->period_bytes_min, hw->buffer_bytes_max); 1988 if (err < 0) 1989 return err; 1990 1991 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1992 snd_pcm_hw_rule_buffer_bytes_max, substream, 1993 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 1994 if (err < 0) 1995 return err; 1996 1997 /* FIXME: remove */ 1998 if (runtime->dma_bytes) { 1999 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 2000 if (err < 0) 2001 return -EINVAL; 2002 } 2003 2004 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 2005 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 2006 snd_pcm_hw_rule_rate, hw, 2007 SNDRV_PCM_HW_PARAM_RATE, -1); 2008 if (err < 0) 2009 return err; 2010 } 2011 2012 /* FIXME: this belong to lowlevel */ 2013 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2014 2015 return 0; 2016 } 2017 2018 static void pcm_release_private(struct snd_pcm_substream *substream) 2019 { 2020 snd_pcm_unlink(substream); 2021 } 2022 2023 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2024 { 2025 substream->ref_count--; 2026 if (substream->ref_count > 0) 2027 return; 2028 2029 snd_pcm_drop(substream); 2030 if (substream->hw_opened) { 2031 if (substream->ops->hw_free != NULL) 2032 substream->ops->hw_free(substream); 2033 substream->ops->close(substream); 2034 substream->hw_opened = 0; 2035 } 2036 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 2037 pm_qos_remove_request(&substream->latency_pm_qos_req); 2038 if (substream->pcm_release) { 2039 substream->pcm_release(substream); 2040 substream->pcm_release = NULL; 2041 } 2042 snd_pcm_detach_substream(substream); 2043 } 2044 2045 EXPORT_SYMBOL(snd_pcm_release_substream); 2046 2047 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2048 struct file *file, 2049 struct snd_pcm_substream **rsubstream) 2050 { 2051 struct snd_pcm_substream *substream; 2052 int err; 2053 2054 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2055 if (err < 0) 2056 return err; 2057 if (substream->ref_count > 1) { 2058 *rsubstream = substream; 2059 return 0; 2060 } 2061 2062 err = snd_pcm_hw_constraints_init(substream); 2063 if (err < 0) { 2064 snd_printd("snd_pcm_hw_constraints_init failed\n"); 2065 goto error; 2066 } 2067 2068 if ((err = substream->ops->open(substream)) < 0) 2069 goto error; 2070 2071 substream->hw_opened = 1; 2072 2073 err = snd_pcm_hw_constraints_complete(substream); 2074 if (err < 0) { 2075 snd_printd("snd_pcm_hw_constraints_complete failed\n"); 2076 goto error; 2077 } 2078 2079 *rsubstream = substream; 2080 return 0; 2081 2082 error: 2083 snd_pcm_release_substream(substream); 2084 return err; 2085 } 2086 2087 EXPORT_SYMBOL(snd_pcm_open_substream); 2088 2089 static int snd_pcm_open_file(struct file *file, 2090 struct snd_pcm *pcm, 2091 int stream) 2092 { 2093 struct snd_pcm_file *pcm_file; 2094 struct snd_pcm_substream *substream; 2095 int err; 2096 2097 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2098 if (err < 0) 2099 return err; 2100 2101 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2102 if (pcm_file == NULL) { 2103 snd_pcm_release_substream(substream); 2104 return -ENOMEM; 2105 } 2106 pcm_file->substream = substream; 2107 if (substream->ref_count == 1) { 2108 substream->file = pcm_file; 2109 substream->pcm_release = pcm_release_private; 2110 } 2111 file->private_data = pcm_file; 2112 2113 return 0; 2114 } 2115 2116 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2117 { 2118 struct snd_pcm *pcm; 2119 int err = nonseekable_open(inode, file); 2120 if (err < 0) 2121 return err; 2122 pcm = snd_lookup_minor_data(iminor(inode), 2123 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2124 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2125 if (pcm) 2126 snd_card_unref(pcm->card); 2127 return err; 2128 } 2129 2130 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2131 { 2132 struct snd_pcm *pcm; 2133 int err = nonseekable_open(inode, file); 2134 if (err < 0) 2135 return err; 2136 pcm = snd_lookup_minor_data(iminor(inode), 2137 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2138 err = snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2139 if (pcm) 2140 snd_card_unref(pcm->card); 2141 return err; 2142 } 2143 2144 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2145 { 2146 int err; 2147 wait_queue_t wait; 2148 2149 if (pcm == NULL) { 2150 err = -ENODEV; 2151 goto __error1; 2152 } 2153 err = snd_card_file_add(pcm->card, file); 2154 if (err < 0) 2155 goto __error1; 2156 if (!try_module_get(pcm->card->module)) { 2157 err = -EFAULT; 2158 goto __error2; 2159 } 2160 init_waitqueue_entry(&wait, current); 2161 add_wait_queue(&pcm->open_wait, &wait); 2162 mutex_lock(&pcm->open_mutex); 2163 while (1) { 2164 err = snd_pcm_open_file(file, pcm, stream); 2165 if (err >= 0) 2166 break; 2167 if (err == -EAGAIN) { 2168 if (file->f_flags & O_NONBLOCK) { 2169 err = -EBUSY; 2170 break; 2171 } 2172 } else 2173 break; 2174 set_current_state(TASK_INTERRUPTIBLE); 2175 mutex_unlock(&pcm->open_mutex); 2176 schedule(); 2177 mutex_lock(&pcm->open_mutex); 2178 if (pcm->card->shutdown) { 2179 err = -ENODEV; 2180 break; 2181 } 2182 if (signal_pending(current)) { 2183 err = -ERESTARTSYS; 2184 break; 2185 } 2186 } 2187 remove_wait_queue(&pcm->open_wait, &wait); 2188 mutex_unlock(&pcm->open_mutex); 2189 if (err < 0) 2190 goto __error; 2191 return err; 2192 2193 __error: 2194 module_put(pcm->card->module); 2195 __error2: 2196 snd_card_file_remove(pcm->card, file); 2197 __error1: 2198 return err; 2199 } 2200 2201 static int snd_pcm_release(struct inode *inode, struct file *file) 2202 { 2203 struct snd_pcm *pcm; 2204 struct snd_pcm_substream *substream; 2205 struct snd_pcm_file *pcm_file; 2206 2207 pcm_file = file->private_data; 2208 substream = pcm_file->substream; 2209 if (snd_BUG_ON(!substream)) 2210 return -ENXIO; 2211 pcm = substream->pcm; 2212 mutex_lock(&pcm->open_mutex); 2213 snd_pcm_release_substream(substream); 2214 kfree(pcm_file); 2215 mutex_unlock(&pcm->open_mutex); 2216 wake_up(&pcm->open_wait); 2217 module_put(pcm->card->module); 2218 snd_card_file_remove(pcm->card, file); 2219 return 0; 2220 } 2221 2222 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2223 snd_pcm_uframes_t frames) 2224 { 2225 struct snd_pcm_runtime *runtime = substream->runtime; 2226 snd_pcm_sframes_t appl_ptr; 2227 snd_pcm_sframes_t ret; 2228 snd_pcm_sframes_t hw_avail; 2229 2230 if (frames == 0) 2231 return 0; 2232 2233 snd_pcm_stream_lock_irq(substream); 2234 switch (runtime->status->state) { 2235 case SNDRV_PCM_STATE_PREPARED: 2236 break; 2237 case SNDRV_PCM_STATE_DRAINING: 2238 case SNDRV_PCM_STATE_RUNNING: 2239 if (snd_pcm_update_hw_ptr(substream) >= 0) 2240 break; 2241 /* Fall through */ 2242 case SNDRV_PCM_STATE_XRUN: 2243 ret = -EPIPE; 2244 goto __end; 2245 case SNDRV_PCM_STATE_SUSPENDED: 2246 ret = -ESTRPIPE; 2247 goto __end; 2248 default: 2249 ret = -EBADFD; 2250 goto __end; 2251 } 2252 2253 hw_avail = snd_pcm_playback_hw_avail(runtime); 2254 if (hw_avail <= 0) { 2255 ret = 0; 2256 goto __end; 2257 } 2258 if (frames > (snd_pcm_uframes_t)hw_avail) 2259 frames = hw_avail; 2260 appl_ptr = runtime->control->appl_ptr - frames; 2261 if (appl_ptr < 0) 2262 appl_ptr += runtime->boundary; 2263 runtime->control->appl_ptr = appl_ptr; 2264 ret = frames; 2265 __end: 2266 snd_pcm_stream_unlock_irq(substream); 2267 return ret; 2268 } 2269 2270 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2271 snd_pcm_uframes_t frames) 2272 { 2273 struct snd_pcm_runtime *runtime = substream->runtime; 2274 snd_pcm_sframes_t appl_ptr; 2275 snd_pcm_sframes_t ret; 2276 snd_pcm_sframes_t hw_avail; 2277 2278 if (frames == 0) 2279 return 0; 2280 2281 snd_pcm_stream_lock_irq(substream); 2282 switch (runtime->status->state) { 2283 case SNDRV_PCM_STATE_PREPARED: 2284 case SNDRV_PCM_STATE_DRAINING: 2285 break; 2286 case SNDRV_PCM_STATE_RUNNING: 2287 if (snd_pcm_update_hw_ptr(substream) >= 0) 2288 break; 2289 /* Fall through */ 2290 case SNDRV_PCM_STATE_XRUN: 2291 ret = -EPIPE; 2292 goto __end; 2293 case SNDRV_PCM_STATE_SUSPENDED: 2294 ret = -ESTRPIPE; 2295 goto __end; 2296 default: 2297 ret = -EBADFD; 2298 goto __end; 2299 } 2300 2301 hw_avail = snd_pcm_capture_hw_avail(runtime); 2302 if (hw_avail <= 0) { 2303 ret = 0; 2304 goto __end; 2305 } 2306 if (frames > (snd_pcm_uframes_t)hw_avail) 2307 frames = hw_avail; 2308 appl_ptr = runtime->control->appl_ptr - frames; 2309 if (appl_ptr < 0) 2310 appl_ptr += runtime->boundary; 2311 runtime->control->appl_ptr = appl_ptr; 2312 ret = frames; 2313 __end: 2314 snd_pcm_stream_unlock_irq(substream); 2315 return ret; 2316 } 2317 2318 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2319 snd_pcm_uframes_t frames) 2320 { 2321 struct snd_pcm_runtime *runtime = substream->runtime; 2322 snd_pcm_sframes_t appl_ptr; 2323 snd_pcm_sframes_t ret; 2324 snd_pcm_sframes_t avail; 2325 2326 if (frames == 0) 2327 return 0; 2328 2329 snd_pcm_stream_lock_irq(substream); 2330 switch (runtime->status->state) { 2331 case SNDRV_PCM_STATE_PREPARED: 2332 case SNDRV_PCM_STATE_PAUSED: 2333 break; 2334 case SNDRV_PCM_STATE_DRAINING: 2335 case SNDRV_PCM_STATE_RUNNING: 2336 if (snd_pcm_update_hw_ptr(substream) >= 0) 2337 break; 2338 /* Fall through */ 2339 case SNDRV_PCM_STATE_XRUN: 2340 ret = -EPIPE; 2341 goto __end; 2342 case SNDRV_PCM_STATE_SUSPENDED: 2343 ret = -ESTRPIPE; 2344 goto __end; 2345 default: 2346 ret = -EBADFD; 2347 goto __end; 2348 } 2349 2350 avail = snd_pcm_playback_avail(runtime); 2351 if (avail <= 0) { 2352 ret = 0; 2353 goto __end; 2354 } 2355 if (frames > (snd_pcm_uframes_t)avail) 2356 frames = avail; 2357 appl_ptr = runtime->control->appl_ptr + frames; 2358 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2359 appl_ptr -= runtime->boundary; 2360 runtime->control->appl_ptr = appl_ptr; 2361 ret = frames; 2362 __end: 2363 snd_pcm_stream_unlock_irq(substream); 2364 return ret; 2365 } 2366 2367 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2368 snd_pcm_uframes_t frames) 2369 { 2370 struct snd_pcm_runtime *runtime = substream->runtime; 2371 snd_pcm_sframes_t appl_ptr; 2372 snd_pcm_sframes_t ret; 2373 snd_pcm_sframes_t avail; 2374 2375 if (frames == 0) 2376 return 0; 2377 2378 snd_pcm_stream_lock_irq(substream); 2379 switch (runtime->status->state) { 2380 case SNDRV_PCM_STATE_PREPARED: 2381 case SNDRV_PCM_STATE_DRAINING: 2382 case SNDRV_PCM_STATE_PAUSED: 2383 break; 2384 case SNDRV_PCM_STATE_RUNNING: 2385 if (snd_pcm_update_hw_ptr(substream) >= 0) 2386 break; 2387 /* Fall through */ 2388 case SNDRV_PCM_STATE_XRUN: 2389 ret = -EPIPE; 2390 goto __end; 2391 case SNDRV_PCM_STATE_SUSPENDED: 2392 ret = -ESTRPIPE; 2393 goto __end; 2394 default: 2395 ret = -EBADFD; 2396 goto __end; 2397 } 2398 2399 avail = snd_pcm_capture_avail(runtime); 2400 if (avail <= 0) { 2401 ret = 0; 2402 goto __end; 2403 } 2404 if (frames > (snd_pcm_uframes_t)avail) 2405 frames = avail; 2406 appl_ptr = runtime->control->appl_ptr + frames; 2407 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2408 appl_ptr -= runtime->boundary; 2409 runtime->control->appl_ptr = appl_ptr; 2410 ret = frames; 2411 __end: 2412 snd_pcm_stream_unlock_irq(substream); 2413 return ret; 2414 } 2415 2416 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2417 { 2418 struct snd_pcm_runtime *runtime = substream->runtime; 2419 int err; 2420 2421 snd_pcm_stream_lock_irq(substream); 2422 switch (runtime->status->state) { 2423 case SNDRV_PCM_STATE_DRAINING: 2424 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2425 goto __badfd; 2426 case SNDRV_PCM_STATE_RUNNING: 2427 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2428 break; 2429 /* Fall through */ 2430 case SNDRV_PCM_STATE_PREPARED: 2431 case SNDRV_PCM_STATE_SUSPENDED: 2432 err = 0; 2433 break; 2434 case SNDRV_PCM_STATE_XRUN: 2435 err = -EPIPE; 2436 break; 2437 default: 2438 __badfd: 2439 err = -EBADFD; 2440 break; 2441 } 2442 snd_pcm_stream_unlock_irq(substream); 2443 return err; 2444 } 2445 2446 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2447 snd_pcm_sframes_t __user *res) 2448 { 2449 struct snd_pcm_runtime *runtime = substream->runtime; 2450 int err; 2451 snd_pcm_sframes_t n = 0; 2452 2453 snd_pcm_stream_lock_irq(substream); 2454 switch (runtime->status->state) { 2455 case SNDRV_PCM_STATE_DRAINING: 2456 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2457 goto __badfd; 2458 case SNDRV_PCM_STATE_RUNNING: 2459 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2460 break; 2461 /* Fall through */ 2462 case SNDRV_PCM_STATE_PREPARED: 2463 case SNDRV_PCM_STATE_SUSPENDED: 2464 err = 0; 2465 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2466 n = snd_pcm_playback_hw_avail(runtime); 2467 else 2468 n = snd_pcm_capture_avail(runtime); 2469 n += runtime->delay; 2470 break; 2471 case SNDRV_PCM_STATE_XRUN: 2472 err = -EPIPE; 2473 break; 2474 default: 2475 __badfd: 2476 err = -EBADFD; 2477 break; 2478 } 2479 snd_pcm_stream_unlock_irq(substream); 2480 if (!err) 2481 if (put_user(n, res)) 2482 err = -EFAULT; 2483 return err; 2484 } 2485 2486 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2487 struct snd_pcm_sync_ptr __user *_sync_ptr) 2488 { 2489 struct snd_pcm_runtime *runtime = substream->runtime; 2490 struct snd_pcm_sync_ptr sync_ptr; 2491 volatile struct snd_pcm_mmap_status *status; 2492 volatile struct snd_pcm_mmap_control *control; 2493 int err; 2494 2495 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2496 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2497 return -EFAULT; 2498 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2499 return -EFAULT; 2500 status = runtime->status; 2501 control = runtime->control; 2502 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2503 err = snd_pcm_hwsync(substream); 2504 if (err < 0) 2505 return err; 2506 } 2507 snd_pcm_stream_lock_irq(substream); 2508 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2509 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2510 else 2511 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2512 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2513 control->avail_min = sync_ptr.c.control.avail_min; 2514 else 2515 sync_ptr.c.control.avail_min = control->avail_min; 2516 sync_ptr.s.status.state = status->state; 2517 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2518 sync_ptr.s.status.tstamp = status->tstamp; 2519 sync_ptr.s.status.suspended_state = status->suspended_state; 2520 snd_pcm_stream_unlock_irq(substream); 2521 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2522 return -EFAULT; 2523 return 0; 2524 } 2525 2526 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2527 { 2528 struct snd_pcm_runtime *runtime = substream->runtime; 2529 int arg; 2530 2531 if (get_user(arg, _arg)) 2532 return -EFAULT; 2533 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2534 return -EINVAL; 2535 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY; 2536 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 2537 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC; 2538 return 0; 2539 } 2540 2541 static int snd_pcm_common_ioctl1(struct file *file, 2542 struct snd_pcm_substream *substream, 2543 unsigned int cmd, void __user *arg) 2544 { 2545 switch (cmd) { 2546 case SNDRV_PCM_IOCTL_PVERSION: 2547 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2548 case SNDRV_PCM_IOCTL_INFO: 2549 return snd_pcm_info_user(substream, arg); 2550 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2551 return 0; 2552 case SNDRV_PCM_IOCTL_TTSTAMP: 2553 return snd_pcm_tstamp(substream, arg); 2554 case SNDRV_PCM_IOCTL_HW_REFINE: 2555 return snd_pcm_hw_refine_user(substream, arg); 2556 case SNDRV_PCM_IOCTL_HW_PARAMS: 2557 return snd_pcm_hw_params_user(substream, arg); 2558 case SNDRV_PCM_IOCTL_HW_FREE: 2559 return snd_pcm_hw_free(substream); 2560 case SNDRV_PCM_IOCTL_SW_PARAMS: 2561 return snd_pcm_sw_params_user(substream, arg); 2562 case SNDRV_PCM_IOCTL_STATUS: 2563 return snd_pcm_status_user(substream, arg); 2564 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2565 return snd_pcm_channel_info_user(substream, arg); 2566 case SNDRV_PCM_IOCTL_PREPARE: 2567 return snd_pcm_prepare(substream, file); 2568 case SNDRV_PCM_IOCTL_RESET: 2569 return snd_pcm_reset(substream); 2570 case SNDRV_PCM_IOCTL_START: 2571 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2572 case SNDRV_PCM_IOCTL_LINK: 2573 return snd_pcm_link(substream, (int)(unsigned long) arg); 2574 case SNDRV_PCM_IOCTL_UNLINK: 2575 return snd_pcm_unlink(substream); 2576 case SNDRV_PCM_IOCTL_RESUME: 2577 return snd_pcm_resume(substream); 2578 case SNDRV_PCM_IOCTL_XRUN: 2579 return snd_pcm_xrun(substream); 2580 case SNDRV_PCM_IOCTL_HWSYNC: 2581 return snd_pcm_hwsync(substream); 2582 case SNDRV_PCM_IOCTL_DELAY: 2583 return snd_pcm_delay(substream, arg); 2584 case SNDRV_PCM_IOCTL_SYNC_PTR: 2585 return snd_pcm_sync_ptr(substream, arg); 2586 #ifdef CONFIG_SND_SUPPORT_OLD_API 2587 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2588 return snd_pcm_hw_refine_old_user(substream, arg); 2589 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2590 return snd_pcm_hw_params_old_user(substream, arg); 2591 #endif 2592 case SNDRV_PCM_IOCTL_DRAIN: 2593 return snd_pcm_drain(substream, file); 2594 case SNDRV_PCM_IOCTL_DROP: 2595 return snd_pcm_drop(substream); 2596 case SNDRV_PCM_IOCTL_PAUSE: 2597 { 2598 int res; 2599 snd_pcm_stream_lock_irq(substream); 2600 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2601 snd_pcm_stream_unlock_irq(substream); 2602 return res; 2603 } 2604 } 2605 snd_printd("unknown ioctl = 0x%x\n", cmd); 2606 return -ENOTTY; 2607 } 2608 2609 static int snd_pcm_playback_ioctl1(struct file *file, 2610 struct snd_pcm_substream *substream, 2611 unsigned int cmd, void __user *arg) 2612 { 2613 if (snd_BUG_ON(!substream)) 2614 return -ENXIO; 2615 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2616 return -EINVAL; 2617 switch (cmd) { 2618 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2619 { 2620 struct snd_xferi xferi; 2621 struct snd_xferi __user *_xferi = arg; 2622 struct snd_pcm_runtime *runtime = substream->runtime; 2623 snd_pcm_sframes_t result; 2624 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2625 return -EBADFD; 2626 if (put_user(0, &_xferi->result)) 2627 return -EFAULT; 2628 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2629 return -EFAULT; 2630 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2631 __put_user(result, &_xferi->result); 2632 return result < 0 ? result : 0; 2633 } 2634 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2635 { 2636 struct snd_xfern xfern; 2637 struct snd_xfern __user *_xfern = arg; 2638 struct snd_pcm_runtime *runtime = substream->runtime; 2639 void __user **bufs; 2640 snd_pcm_sframes_t result; 2641 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2642 return -EBADFD; 2643 if (runtime->channels > 128) 2644 return -EINVAL; 2645 if (put_user(0, &_xfern->result)) 2646 return -EFAULT; 2647 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2648 return -EFAULT; 2649 2650 bufs = memdup_user(xfern.bufs, 2651 sizeof(void *) * runtime->channels); 2652 if (IS_ERR(bufs)) 2653 return PTR_ERR(bufs); 2654 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2655 kfree(bufs); 2656 __put_user(result, &_xfern->result); 2657 return result < 0 ? result : 0; 2658 } 2659 case SNDRV_PCM_IOCTL_REWIND: 2660 { 2661 snd_pcm_uframes_t frames; 2662 snd_pcm_uframes_t __user *_frames = arg; 2663 snd_pcm_sframes_t result; 2664 if (get_user(frames, _frames)) 2665 return -EFAULT; 2666 if (put_user(0, _frames)) 2667 return -EFAULT; 2668 result = snd_pcm_playback_rewind(substream, frames); 2669 __put_user(result, _frames); 2670 return result < 0 ? result : 0; 2671 } 2672 case SNDRV_PCM_IOCTL_FORWARD: 2673 { 2674 snd_pcm_uframes_t frames; 2675 snd_pcm_uframes_t __user *_frames = arg; 2676 snd_pcm_sframes_t result; 2677 if (get_user(frames, _frames)) 2678 return -EFAULT; 2679 if (put_user(0, _frames)) 2680 return -EFAULT; 2681 result = snd_pcm_playback_forward(substream, frames); 2682 __put_user(result, _frames); 2683 return result < 0 ? result : 0; 2684 } 2685 } 2686 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2687 } 2688 2689 static int snd_pcm_capture_ioctl1(struct file *file, 2690 struct snd_pcm_substream *substream, 2691 unsigned int cmd, void __user *arg) 2692 { 2693 if (snd_BUG_ON(!substream)) 2694 return -ENXIO; 2695 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2696 return -EINVAL; 2697 switch (cmd) { 2698 case SNDRV_PCM_IOCTL_READI_FRAMES: 2699 { 2700 struct snd_xferi xferi; 2701 struct snd_xferi __user *_xferi = arg; 2702 struct snd_pcm_runtime *runtime = substream->runtime; 2703 snd_pcm_sframes_t result; 2704 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2705 return -EBADFD; 2706 if (put_user(0, &_xferi->result)) 2707 return -EFAULT; 2708 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2709 return -EFAULT; 2710 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2711 __put_user(result, &_xferi->result); 2712 return result < 0 ? result : 0; 2713 } 2714 case SNDRV_PCM_IOCTL_READN_FRAMES: 2715 { 2716 struct snd_xfern xfern; 2717 struct snd_xfern __user *_xfern = arg; 2718 struct snd_pcm_runtime *runtime = substream->runtime; 2719 void *bufs; 2720 snd_pcm_sframes_t result; 2721 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2722 return -EBADFD; 2723 if (runtime->channels > 128) 2724 return -EINVAL; 2725 if (put_user(0, &_xfern->result)) 2726 return -EFAULT; 2727 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2728 return -EFAULT; 2729 2730 bufs = memdup_user(xfern.bufs, 2731 sizeof(void *) * runtime->channels); 2732 if (IS_ERR(bufs)) 2733 return PTR_ERR(bufs); 2734 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2735 kfree(bufs); 2736 __put_user(result, &_xfern->result); 2737 return result < 0 ? result : 0; 2738 } 2739 case SNDRV_PCM_IOCTL_REWIND: 2740 { 2741 snd_pcm_uframes_t frames; 2742 snd_pcm_uframes_t __user *_frames = arg; 2743 snd_pcm_sframes_t result; 2744 if (get_user(frames, _frames)) 2745 return -EFAULT; 2746 if (put_user(0, _frames)) 2747 return -EFAULT; 2748 result = snd_pcm_capture_rewind(substream, frames); 2749 __put_user(result, _frames); 2750 return result < 0 ? result : 0; 2751 } 2752 case SNDRV_PCM_IOCTL_FORWARD: 2753 { 2754 snd_pcm_uframes_t frames; 2755 snd_pcm_uframes_t __user *_frames = arg; 2756 snd_pcm_sframes_t result; 2757 if (get_user(frames, _frames)) 2758 return -EFAULT; 2759 if (put_user(0, _frames)) 2760 return -EFAULT; 2761 result = snd_pcm_capture_forward(substream, frames); 2762 __put_user(result, _frames); 2763 return result < 0 ? result : 0; 2764 } 2765 } 2766 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2767 } 2768 2769 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2770 unsigned long arg) 2771 { 2772 struct snd_pcm_file *pcm_file; 2773 2774 pcm_file = file->private_data; 2775 2776 if (((cmd >> 8) & 0xff) != 'A') 2777 return -ENOTTY; 2778 2779 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2780 (void __user *)arg); 2781 } 2782 2783 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2784 unsigned long arg) 2785 { 2786 struct snd_pcm_file *pcm_file; 2787 2788 pcm_file = file->private_data; 2789 2790 if (((cmd >> 8) & 0xff) != 'A') 2791 return -ENOTTY; 2792 2793 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2794 (void __user *)arg); 2795 } 2796 2797 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2798 unsigned int cmd, void *arg) 2799 { 2800 mm_segment_t fs; 2801 int result; 2802 2803 fs = snd_enter_user(); 2804 switch (substream->stream) { 2805 case SNDRV_PCM_STREAM_PLAYBACK: 2806 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2807 (void __user *)arg); 2808 break; 2809 case SNDRV_PCM_STREAM_CAPTURE: 2810 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2811 (void __user *)arg); 2812 break; 2813 default: 2814 result = -EINVAL; 2815 break; 2816 } 2817 snd_leave_user(fs); 2818 return result; 2819 } 2820 2821 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2822 2823 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2824 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_read(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_write(struct file *file, const char __user *buf, 2848 size_t count, loff_t * offset) 2849 { 2850 struct snd_pcm_file *pcm_file; 2851 struct snd_pcm_substream *substream; 2852 struct snd_pcm_runtime *runtime; 2853 snd_pcm_sframes_t result; 2854 2855 pcm_file = file->private_data; 2856 substream = pcm_file->substream; 2857 if (PCM_RUNTIME_CHECK(substream)) 2858 return -ENXIO; 2859 runtime = substream->runtime; 2860 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2861 return -EBADFD; 2862 if (!frame_aligned(runtime, count)) 2863 return -EINVAL; 2864 count = bytes_to_frames(runtime, count); 2865 result = snd_pcm_lib_write(substream, buf, count); 2866 if (result > 0) 2867 result = frames_to_bytes(runtime, result); 2868 return result; 2869 } 2870 2871 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 2872 unsigned long nr_segs, loff_t pos) 2873 2874 { 2875 struct snd_pcm_file *pcm_file; 2876 struct snd_pcm_substream *substream; 2877 struct snd_pcm_runtime *runtime; 2878 snd_pcm_sframes_t result; 2879 unsigned long i; 2880 void __user **bufs; 2881 snd_pcm_uframes_t frames; 2882 2883 pcm_file = iocb->ki_filp->private_data; 2884 substream = pcm_file->substream; 2885 if (PCM_RUNTIME_CHECK(substream)) 2886 return -ENXIO; 2887 runtime = substream->runtime; 2888 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2889 return -EBADFD; 2890 if (nr_segs > 1024 || nr_segs != runtime->channels) 2891 return -EINVAL; 2892 if (!frame_aligned(runtime, iov->iov_len)) 2893 return -EINVAL; 2894 frames = bytes_to_samples(runtime, iov->iov_len); 2895 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2896 if (bufs == NULL) 2897 return -ENOMEM; 2898 for (i = 0; i < nr_segs; ++i) 2899 bufs[i] = iov[i].iov_base; 2900 result = snd_pcm_lib_readv(substream, bufs, frames); 2901 if (result > 0) 2902 result = frames_to_bytes(runtime, result); 2903 kfree(bufs); 2904 return result; 2905 } 2906 2907 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 2908 unsigned long nr_segs, loff_t pos) 2909 { 2910 struct snd_pcm_file *pcm_file; 2911 struct snd_pcm_substream *substream; 2912 struct snd_pcm_runtime *runtime; 2913 snd_pcm_sframes_t result; 2914 unsigned long i; 2915 void __user **bufs; 2916 snd_pcm_uframes_t frames; 2917 2918 pcm_file = iocb->ki_filp->private_data; 2919 substream = pcm_file->substream; 2920 if (PCM_RUNTIME_CHECK(substream)) 2921 return -ENXIO; 2922 runtime = substream->runtime; 2923 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2924 return -EBADFD; 2925 if (nr_segs > 128 || nr_segs != runtime->channels || 2926 !frame_aligned(runtime, iov->iov_len)) 2927 return -EINVAL; 2928 frames = bytes_to_samples(runtime, iov->iov_len); 2929 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2930 if (bufs == NULL) 2931 return -ENOMEM; 2932 for (i = 0; i < nr_segs; ++i) 2933 bufs[i] = iov[i].iov_base; 2934 result = snd_pcm_lib_writev(substream, bufs, frames); 2935 if (result > 0) 2936 result = frames_to_bytes(runtime, result); 2937 kfree(bufs); 2938 return result; 2939 } 2940 2941 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 2942 { 2943 struct snd_pcm_file *pcm_file; 2944 struct snd_pcm_substream *substream; 2945 struct snd_pcm_runtime *runtime; 2946 unsigned int mask; 2947 snd_pcm_uframes_t avail; 2948 2949 pcm_file = file->private_data; 2950 2951 substream = pcm_file->substream; 2952 if (PCM_RUNTIME_CHECK(substream)) 2953 return -ENXIO; 2954 runtime = substream->runtime; 2955 2956 poll_wait(file, &runtime->sleep, wait); 2957 2958 snd_pcm_stream_lock_irq(substream); 2959 avail = snd_pcm_playback_avail(runtime); 2960 switch (runtime->status->state) { 2961 case SNDRV_PCM_STATE_RUNNING: 2962 case SNDRV_PCM_STATE_PREPARED: 2963 case SNDRV_PCM_STATE_PAUSED: 2964 if (avail >= runtime->control->avail_min) { 2965 mask = POLLOUT | POLLWRNORM; 2966 break; 2967 } 2968 /* Fall through */ 2969 case SNDRV_PCM_STATE_DRAINING: 2970 mask = 0; 2971 break; 2972 default: 2973 mask = POLLOUT | POLLWRNORM | POLLERR; 2974 break; 2975 } 2976 snd_pcm_stream_unlock_irq(substream); 2977 return mask; 2978 } 2979 2980 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 2981 { 2982 struct snd_pcm_file *pcm_file; 2983 struct snd_pcm_substream *substream; 2984 struct snd_pcm_runtime *runtime; 2985 unsigned int mask; 2986 snd_pcm_uframes_t avail; 2987 2988 pcm_file = file->private_data; 2989 2990 substream = pcm_file->substream; 2991 if (PCM_RUNTIME_CHECK(substream)) 2992 return -ENXIO; 2993 runtime = substream->runtime; 2994 2995 poll_wait(file, &runtime->sleep, wait); 2996 2997 snd_pcm_stream_lock_irq(substream); 2998 avail = snd_pcm_capture_avail(runtime); 2999 switch (runtime->status->state) { 3000 case SNDRV_PCM_STATE_RUNNING: 3001 case SNDRV_PCM_STATE_PREPARED: 3002 case SNDRV_PCM_STATE_PAUSED: 3003 if (avail >= runtime->control->avail_min) { 3004 mask = POLLIN | POLLRDNORM; 3005 break; 3006 } 3007 mask = 0; 3008 break; 3009 case SNDRV_PCM_STATE_DRAINING: 3010 if (avail > 0) { 3011 mask = POLLIN | POLLRDNORM; 3012 break; 3013 } 3014 /* Fall through */ 3015 default: 3016 mask = POLLIN | POLLRDNORM | POLLERR; 3017 break; 3018 } 3019 snd_pcm_stream_unlock_irq(substream); 3020 return mask; 3021 } 3022 3023 /* 3024 * mmap support 3025 */ 3026 3027 /* 3028 * Only on coherent architectures, we can mmap the status and the control records 3029 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3030 */ 3031 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3032 /* 3033 * mmap status record 3034 */ 3035 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 3036 struct vm_fault *vmf) 3037 { 3038 struct snd_pcm_substream *substream = area->vm_private_data; 3039 struct snd_pcm_runtime *runtime; 3040 3041 if (substream == NULL) 3042 return VM_FAULT_SIGBUS; 3043 runtime = substream->runtime; 3044 vmf->page = virt_to_page(runtime->status); 3045 get_page(vmf->page); 3046 return 0; 3047 } 3048 3049 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3050 { 3051 .fault = snd_pcm_mmap_status_fault, 3052 }; 3053 3054 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3055 struct vm_area_struct *area) 3056 { 3057 long size; 3058 if (!(area->vm_flags & VM_READ)) 3059 return -EINVAL; 3060 size = area->vm_end - area->vm_start; 3061 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3062 return -EINVAL; 3063 area->vm_ops = &snd_pcm_vm_ops_status; 3064 area->vm_private_data = substream; 3065 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3066 return 0; 3067 } 3068 3069 /* 3070 * mmap control record 3071 */ 3072 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3073 struct vm_fault *vmf) 3074 { 3075 struct snd_pcm_substream *substream = area->vm_private_data; 3076 struct snd_pcm_runtime *runtime; 3077 3078 if (substream == NULL) 3079 return VM_FAULT_SIGBUS; 3080 runtime = substream->runtime; 3081 vmf->page = virt_to_page(runtime->control); 3082 get_page(vmf->page); 3083 return 0; 3084 } 3085 3086 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3087 { 3088 .fault = snd_pcm_mmap_control_fault, 3089 }; 3090 3091 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3092 struct vm_area_struct *area) 3093 { 3094 long size; 3095 if (!(area->vm_flags & VM_READ)) 3096 return -EINVAL; 3097 size = area->vm_end - area->vm_start; 3098 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3099 return -EINVAL; 3100 area->vm_ops = &snd_pcm_vm_ops_control; 3101 area->vm_private_data = substream; 3102 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3103 return 0; 3104 } 3105 #else /* ! coherent mmap */ 3106 /* 3107 * don't support mmap for status and control records. 3108 */ 3109 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3110 struct vm_area_struct *area) 3111 { 3112 return -ENXIO; 3113 } 3114 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3115 struct vm_area_struct *area) 3116 { 3117 return -ENXIO; 3118 } 3119 #endif /* coherent mmap */ 3120 3121 static inline struct page * 3122 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3123 { 3124 void *vaddr = substream->runtime->dma_area + ofs; 3125 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3126 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3127 return virt_to_page(CAC_ADDR(vaddr)); 3128 #endif 3129 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE) 3130 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) { 3131 dma_addr_t addr = substream->runtime->dma_addr + ofs; 3132 addr -= get_dma_offset(substream->dma_buffer.dev.dev); 3133 /* assume dma_handle set via pfn_to_phys() in 3134 * mm/dma-noncoherent.c 3135 */ 3136 return pfn_to_page(addr >> PAGE_SHIFT); 3137 } 3138 #endif 3139 return virt_to_page(vaddr); 3140 } 3141 3142 /* 3143 * fault callback for mmapping a RAM page 3144 */ 3145 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3146 struct vm_fault *vmf) 3147 { 3148 struct snd_pcm_substream *substream = area->vm_private_data; 3149 struct snd_pcm_runtime *runtime; 3150 unsigned long offset; 3151 struct page * page; 3152 size_t dma_bytes; 3153 3154 if (substream == NULL) 3155 return VM_FAULT_SIGBUS; 3156 runtime = substream->runtime; 3157 offset = vmf->pgoff << PAGE_SHIFT; 3158 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3159 if (offset > dma_bytes - PAGE_SIZE) 3160 return VM_FAULT_SIGBUS; 3161 if (substream->ops->page) 3162 page = substream->ops->page(substream, offset); 3163 else 3164 page = snd_pcm_default_page_ops(substream, offset); 3165 if (!page) 3166 return VM_FAULT_SIGBUS; 3167 get_page(page); 3168 vmf->page = page; 3169 return 0; 3170 } 3171 3172 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3173 .open = snd_pcm_mmap_data_open, 3174 .close = snd_pcm_mmap_data_close, 3175 }; 3176 3177 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3178 .open = snd_pcm_mmap_data_open, 3179 .close = snd_pcm_mmap_data_close, 3180 .fault = snd_pcm_mmap_data_fault, 3181 }; 3182 3183 #ifndef ARCH_HAS_DMA_MMAP_COHERENT 3184 /* This should be defined / handled globally! */ 3185 #ifdef CONFIG_ARM 3186 #define ARCH_HAS_DMA_MMAP_COHERENT 3187 #endif 3188 #endif 3189 3190 /* 3191 * mmap the DMA buffer on RAM 3192 */ 3193 int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream, 3194 struct vm_area_struct *area) 3195 { 3196 area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP; 3197 #ifdef ARCH_HAS_DMA_MMAP_COHERENT 3198 if (!substream->ops->page && 3199 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3200 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3201 area, 3202 substream->runtime->dma_area, 3203 substream->runtime->dma_addr, 3204 area->vm_end - area->vm_start); 3205 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3206 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV && 3207 !plat_device_is_coherent(substream->dma_buffer.dev.dev)) 3208 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3209 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */ 3210 /* mmap with fault handler */ 3211 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3212 return 0; 3213 } 3214 EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap); 3215 3216 /* 3217 * mmap the DMA buffer on I/O memory area 3218 */ 3219 #if SNDRV_PCM_INFO_MMAP_IOMEM 3220 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3221 struct vm_area_struct *area) 3222 { 3223 long size; 3224 unsigned long offset; 3225 3226 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3227 area->vm_flags |= VM_IO; 3228 size = area->vm_end - area->vm_start; 3229 offset = area->vm_pgoff << PAGE_SHIFT; 3230 if (io_remap_pfn_range(area, area->vm_start, 3231 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT, 3232 size, area->vm_page_prot)) 3233 return -EAGAIN; 3234 return 0; 3235 } 3236 3237 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3238 #endif /* SNDRV_PCM_INFO_MMAP */ 3239 3240 /* 3241 * mmap DMA buffer 3242 */ 3243 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3244 struct vm_area_struct *area) 3245 { 3246 struct snd_pcm_runtime *runtime; 3247 long size; 3248 unsigned long offset; 3249 size_t dma_bytes; 3250 int err; 3251 3252 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3253 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3254 return -EINVAL; 3255 } else { 3256 if (!(area->vm_flags & VM_READ)) 3257 return -EINVAL; 3258 } 3259 runtime = substream->runtime; 3260 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3261 return -EBADFD; 3262 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3263 return -ENXIO; 3264 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3265 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3266 return -EINVAL; 3267 size = area->vm_end - area->vm_start; 3268 offset = area->vm_pgoff << PAGE_SHIFT; 3269 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3270 if ((size_t)size > dma_bytes) 3271 return -EINVAL; 3272 if (offset > dma_bytes - size) 3273 return -EINVAL; 3274 3275 area->vm_ops = &snd_pcm_vm_ops_data; 3276 area->vm_private_data = substream; 3277 if (substream->ops->mmap) 3278 err = substream->ops->mmap(substream, area); 3279 else 3280 err = snd_pcm_lib_default_mmap(substream, area); 3281 if (!err) 3282 atomic_inc(&substream->mmap_count); 3283 return err; 3284 } 3285 3286 EXPORT_SYMBOL(snd_pcm_mmap_data); 3287 3288 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3289 { 3290 struct snd_pcm_file * pcm_file; 3291 struct snd_pcm_substream *substream; 3292 unsigned long offset; 3293 3294 pcm_file = file->private_data; 3295 substream = pcm_file->substream; 3296 if (PCM_RUNTIME_CHECK(substream)) 3297 return -ENXIO; 3298 3299 offset = area->vm_pgoff << PAGE_SHIFT; 3300 switch (offset) { 3301 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3302 if (pcm_file->no_compat_mmap) 3303 return -ENXIO; 3304 return snd_pcm_mmap_status(substream, file, area); 3305 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3306 if (pcm_file->no_compat_mmap) 3307 return -ENXIO; 3308 return snd_pcm_mmap_control(substream, file, area); 3309 default: 3310 return snd_pcm_mmap_data(substream, file, area); 3311 } 3312 return 0; 3313 } 3314 3315 static int snd_pcm_fasync(int fd, struct file * file, int on) 3316 { 3317 struct snd_pcm_file * pcm_file; 3318 struct snd_pcm_substream *substream; 3319 struct snd_pcm_runtime *runtime; 3320 3321 pcm_file = file->private_data; 3322 substream = pcm_file->substream; 3323 if (PCM_RUNTIME_CHECK(substream)) 3324 return -ENXIO; 3325 runtime = substream->runtime; 3326 return fasync_helper(fd, file, on, &runtime->fasync); 3327 } 3328 3329 /* 3330 * ioctl32 compat 3331 */ 3332 #ifdef CONFIG_COMPAT 3333 #include "pcm_compat.c" 3334 #else 3335 #define snd_pcm_ioctl_compat NULL 3336 #endif 3337 3338 /* 3339 * To be removed helpers to keep binary compatibility 3340 */ 3341 3342 #ifdef CONFIG_SND_SUPPORT_OLD_API 3343 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3344 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3345 3346 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3347 struct snd_pcm_hw_params_old *oparams) 3348 { 3349 unsigned int i; 3350 3351 memset(params, 0, sizeof(*params)); 3352 params->flags = oparams->flags; 3353 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3354 params->masks[i].bits[0] = oparams->masks[i]; 3355 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3356 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3357 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3358 params->info = oparams->info; 3359 params->msbits = oparams->msbits; 3360 params->rate_num = oparams->rate_num; 3361 params->rate_den = oparams->rate_den; 3362 params->fifo_size = oparams->fifo_size; 3363 } 3364 3365 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3366 struct snd_pcm_hw_params *params) 3367 { 3368 unsigned int i; 3369 3370 memset(oparams, 0, sizeof(*oparams)); 3371 oparams->flags = params->flags; 3372 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3373 oparams->masks[i] = params->masks[i].bits[0]; 3374 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3375 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3376 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3377 oparams->info = params->info; 3378 oparams->msbits = params->msbits; 3379 oparams->rate_num = params->rate_num; 3380 oparams->rate_den = params->rate_den; 3381 oparams->fifo_size = params->fifo_size; 3382 } 3383 3384 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3385 struct snd_pcm_hw_params_old __user * _oparams) 3386 { 3387 struct snd_pcm_hw_params *params; 3388 struct snd_pcm_hw_params_old *oparams = NULL; 3389 int err; 3390 3391 params = kmalloc(sizeof(*params), GFP_KERNEL); 3392 if (!params) 3393 return -ENOMEM; 3394 3395 oparams = memdup_user(_oparams, sizeof(*oparams)); 3396 if (IS_ERR(oparams)) { 3397 err = PTR_ERR(oparams); 3398 goto out; 3399 } 3400 snd_pcm_hw_convert_from_old_params(params, oparams); 3401 err = snd_pcm_hw_refine(substream, params); 3402 snd_pcm_hw_convert_to_old_params(oparams, params); 3403 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3404 if (!err) 3405 err = -EFAULT; 3406 } 3407 3408 kfree(oparams); 3409 out: 3410 kfree(params); 3411 return err; 3412 } 3413 3414 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3415 struct snd_pcm_hw_params_old __user * _oparams) 3416 { 3417 struct snd_pcm_hw_params *params; 3418 struct snd_pcm_hw_params_old *oparams = NULL; 3419 int err; 3420 3421 params = kmalloc(sizeof(*params), GFP_KERNEL); 3422 if (!params) 3423 return -ENOMEM; 3424 3425 oparams = memdup_user(_oparams, sizeof(*oparams)); 3426 if (IS_ERR(oparams)) { 3427 err = PTR_ERR(oparams); 3428 goto out; 3429 } 3430 snd_pcm_hw_convert_from_old_params(params, oparams); 3431 err = snd_pcm_hw_params(substream, params); 3432 snd_pcm_hw_convert_to_old_params(oparams, params); 3433 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3434 if (!err) 3435 err = -EFAULT; 3436 } 3437 3438 kfree(oparams); 3439 out: 3440 kfree(params); 3441 return err; 3442 } 3443 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3444 3445 #ifndef CONFIG_MMU 3446 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3447 unsigned long addr, 3448 unsigned long len, 3449 unsigned long pgoff, 3450 unsigned long flags) 3451 { 3452 struct snd_pcm_file *pcm_file = file->private_data; 3453 struct snd_pcm_substream *substream = pcm_file->substream; 3454 struct snd_pcm_runtime *runtime = substream->runtime; 3455 unsigned long offset = pgoff << PAGE_SHIFT; 3456 3457 switch (offset) { 3458 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3459 return (unsigned long)runtime->status; 3460 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3461 return (unsigned long)runtime->control; 3462 default: 3463 return (unsigned long)runtime->dma_area + offset; 3464 } 3465 } 3466 #else 3467 # define snd_pcm_get_unmapped_area NULL 3468 #endif 3469 3470 /* 3471 * Register section 3472 */ 3473 3474 const struct file_operations snd_pcm_f_ops[2] = { 3475 { 3476 .owner = THIS_MODULE, 3477 .write = snd_pcm_write, 3478 .aio_write = snd_pcm_aio_write, 3479 .open = snd_pcm_playback_open, 3480 .release = snd_pcm_release, 3481 .llseek = no_llseek, 3482 .poll = snd_pcm_playback_poll, 3483 .unlocked_ioctl = snd_pcm_playback_ioctl, 3484 .compat_ioctl = snd_pcm_ioctl_compat, 3485 .mmap = snd_pcm_mmap, 3486 .fasync = snd_pcm_fasync, 3487 .get_unmapped_area = snd_pcm_get_unmapped_area, 3488 }, 3489 { 3490 .owner = THIS_MODULE, 3491 .read = snd_pcm_read, 3492 .aio_read = snd_pcm_aio_read, 3493 .open = snd_pcm_capture_open, 3494 .release = snd_pcm_release, 3495 .llseek = no_llseek, 3496 .poll = snd_pcm_capture_poll, 3497 .unlocked_ioctl = snd_pcm_capture_ioctl, 3498 .compat_ioctl = snd_pcm_ioctl_compat, 3499 .mmap = snd_pcm_mmap, 3500 .fasync = snd_pcm_fasync, 3501 .get_unmapped_area = snd_pcm_get_unmapped_area, 3502 } 3503 }; 3504