1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/mm.h> 23 #include <linux/file.h> 24 #include <linux/slab.h> 25 #include <linux/smp_lock.h> 26 #include <linux/time.h> 27 #include <linux/pm_qos_params.h> 28 #include <linux/uio.h> 29 #include <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 char *snd_pcm_hw_param_names[] = { 146 HW_PARAM(ACCESS), 147 HW_PARAM(FORMAT), 148 HW_PARAM(SUBFORMAT), 149 HW_PARAM(SAMPLE_BITS), 150 HW_PARAM(FRAME_BITS), 151 HW_PARAM(CHANNELS), 152 HW_PARAM(RATE), 153 HW_PARAM(PERIOD_TIME), 154 HW_PARAM(PERIOD_SIZE), 155 HW_PARAM(PERIOD_BYTES), 156 HW_PARAM(PERIODS), 157 HW_PARAM(BUFFER_TIME), 158 HW_PARAM(BUFFER_SIZE), 159 HW_PARAM(BUFFER_BYTES), 160 HW_PARAM(TICK_TIME), 161 }; 162 #endif 163 164 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 165 struct snd_pcm_hw_params *params) 166 { 167 unsigned int k; 168 struct snd_pcm_hardware *hw; 169 struct snd_interval *i = NULL; 170 struct snd_mask *m = NULL; 171 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints; 172 unsigned int rstamps[constrs->rules_num]; 173 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 174 unsigned int stamp = 2; 175 int changed, again; 176 177 params->info = 0; 178 params->fifo_size = 0; 179 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 180 params->msbits = 0; 181 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 182 params->rate_num = 0; 183 params->rate_den = 0; 184 } 185 186 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 187 m = hw_param_mask(params, k); 188 if (snd_mask_empty(m)) 189 return -EINVAL; 190 if (!(params->rmask & (1 << k))) 191 continue; 192 #ifdef RULES_DEBUG 193 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]); 194 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 195 #endif 196 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 197 #ifdef RULES_DEBUG 198 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 199 #endif 200 if (changed) 201 params->cmask |= 1 << k; 202 if (changed < 0) 203 return changed; 204 } 205 206 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 207 i = hw_param_interval(params, k); 208 if (snd_interval_empty(i)) 209 return -EINVAL; 210 if (!(params->rmask & (1 << k))) 211 continue; 212 #ifdef RULES_DEBUG 213 printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]); 214 if (i->empty) 215 printk("empty"); 216 else 217 printk("%c%u %u%c", 218 i->openmin ? '(' : '[', i->min, 219 i->max, i->openmax ? ')' : ']'); 220 printk(" -> "); 221 #endif 222 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 223 #ifdef RULES_DEBUG 224 if (i->empty) 225 printk("empty\n"); 226 else 227 printk("%c%u %u%c\n", 228 i->openmin ? '(' : '[', i->min, 229 i->max, i->openmax ? ')' : ']'); 230 #endif 231 if (changed) 232 params->cmask |= 1 << k; 233 if (changed < 0) 234 return changed; 235 } 236 237 for (k = 0; k < constrs->rules_num; k++) 238 rstamps[k] = 0; 239 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 240 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 241 do { 242 again = 0; 243 for (k = 0; k < constrs->rules_num; k++) { 244 struct snd_pcm_hw_rule *r = &constrs->rules[k]; 245 unsigned int d; 246 int doit = 0; 247 if (r->cond && !(r->cond & params->flags)) 248 continue; 249 for (d = 0; r->deps[d] >= 0; d++) { 250 if (vstamps[r->deps[d]] > rstamps[k]) { 251 doit = 1; 252 break; 253 } 254 } 255 if (!doit) 256 continue; 257 #ifdef RULES_DEBUG 258 printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func); 259 if (r->var >= 0) { 260 printk("%s = ", snd_pcm_hw_param_names[r->var]); 261 if (hw_is_mask(r->var)) { 262 m = hw_param_mask(params, r->var); 263 printk("%x", *m->bits); 264 } else { 265 i = hw_param_interval(params, r->var); 266 if (i->empty) 267 printk("empty"); 268 else 269 printk("%c%u %u%c", 270 i->openmin ? '(' : '[', i->min, 271 i->max, i->openmax ? ')' : ']'); 272 } 273 } 274 #endif 275 changed = r->func(params, r); 276 #ifdef RULES_DEBUG 277 if (r->var >= 0) { 278 printk(" -> "); 279 if (hw_is_mask(r->var)) 280 printk("%x", *m->bits); 281 else { 282 if (i->empty) 283 printk("empty"); 284 else 285 printk("%c%u %u%c", 286 i->openmin ? '(' : '[', i->min, 287 i->max, i->openmax ? ')' : ']'); 288 } 289 } 290 printk("\n"); 291 #endif 292 rstamps[k] = stamp; 293 if (changed && r->var >= 0) { 294 params->cmask |= (1 << r->var); 295 vstamps[r->var] = stamp; 296 again = 1; 297 } 298 if (changed < 0) 299 return changed; 300 stamp++; 301 } 302 } while (again); 303 if (!params->msbits) { 304 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 305 if (snd_interval_single(i)) 306 params->msbits = snd_interval_value(i); 307 } 308 309 if (!params->rate_den) { 310 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 311 if (snd_interval_single(i)) { 312 params->rate_num = snd_interval_value(i); 313 params->rate_den = 1; 314 } 315 } 316 317 hw = &substream->runtime->hw; 318 if (!params->info) 319 params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES; 320 if (!params->fifo_size) { 321 m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 322 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS); 323 if (snd_mask_min(m) == snd_mask_max(m) && 324 snd_interval_min(i) == snd_interval_max(i)) { 325 changed = substream->ops->ioctl(substream, 326 SNDRV_PCM_IOCTL1_FIFO_SIZE, params); 327 if (changed < 0) 328 return changed; 329 } 330 } 331 params->rmask = 0; 332 return 0; 333 } 334 335 EXPORT_SYMBOL(snd_pcm_hw_refine); 336 337 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 338 struct snd_pcm_hw_params __user * _params) 339 { 340 struct snd_pcm_hw_params *params; 341 int err; 342 343 params = memdup_user(_params, sizeof(*params)); 344 if (IS_ERR(params)) 345 return PTR_ERR(params); 346 347 err = snd_pcm_hw_refine(substream, params); 348 if (copy_to_user(_params, params, sizeof(*params))) { 349 if (!err) 350 err = -EFAULT; 351 } 352 353 kfree(params); 354 return err; 355 } 356 357 static int period_to_usecs(struct snd_pcm_runtime *runtime) 358 { 359 int usecs; 360 361 if (! runtime->rate) 362 return -1; /* invalid */ 363 364 /* take 75% of period time as the deadline */ 365 usecs = (750000 / runtime->rate) * runtime->period_size; 366 usecs += ((750000 % runtime->rate) * runtime->period_size) / 367 runtime->rate; 368 369 return usecs; 370 } 371 372 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 373 struct snd_pcm_hw_params *params) 374 { 375 struct snd_pcm_runtime *runtime; 376 int err, usecs; 377 unsigned int bits; 378 snd_pcm_uframes_t frames; 379 380 if (PCM_RUNTIME_CHECK(substream)) 381 return -ENXIO; 382 runtime = substream->runtime; 383 snd_pcm_stream_lock_irq(substream); 384 switch (runtime->status->state) { 385 case SNDRV_PCM_STATE_OPEN: 386 case SNDRV_PCM_STATE_SETUP: 387 case SNDRV_PCM_STATE_PREPARED: 388 break; 389 default: 390 snd_pcm_stream_unlock_irq(substream); 391 return -EBADFD; 392 } 393 snd_pcm_stream_unlock_irq(substream); 394 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 395 if (!substream->oss.oss) 396 #endif 397 if (atomic_read(&substream->mmap_count)) 398 return -EBADFD; 399 400 params->rmask = ~0U; 401 err = snd_pcm_hw_refine(substream, params); 402 if (err < 0) 403 goto _error; 404 405 err = snd_pcm_hw_params_choose(substream, params); 406 if (err < 0) 407 goto _error; 408 409 if (substream->ops->hw_params != NULL) { 410 err = substream->ops->hw_params(substream, params); 411 if (err < 0) 412 goto _error; 413 } 414 415 runtime->access = params_access(params); 416 runtime->format = params_format(params); 417 runtime->subformat = params_subformat(params); 418 runtime->channels = params_channels(params); 419 runtime->rate = params_rate(params); 420 runtime->period_size = params_period_size(params); 421 runtime->periods = params_periods(params); 422 runtime->buffer_size = params_buffer_size(params); 423 runtime->info = params->info; 424 runtime->rate_num = params->rate_num; 425 runtime->rate_den = params->rate_den; 426 427 bits = snd_pcm_format_physical_width(runtime->format); 428 runtime->sample_bits = bits; 429 bits *= runtime->channels; 430 runtime->frame_bits = bits; 431 frames = 1; 432 while (bits % 8 != 0) { 433 bits *= 2; 434 frames *= 2; 435 } 436 runtime->byte_align = bits / 8; 437 runtime->min_align = frames; 438 439 /* Default sw params */ 440 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 441 runtime->period_step = 1; 442 runtime->control->avail_min = runtime->period_size; 443 runtime->start_threshold = 1; 444 runtime->stop_threshold = runtime->buffer_size; 445 runtime->silence_threshold = 0; 446 runtime->silence_size = 0; 447 runtime->boundary = runtime->buffer_size; 448 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 449 runtime->boundary *= 2; 450 451 snd_pcm_timer_resolution_change(substream); 452 runtime->status->state = SNDRV_PCM_STATE_SETUP; 453 454 if (pm_qos_request_active(&substream->latency_pm_qos_req)) 455 pm_qos_remove_request(&substream->latency_pm_qos_req); 456 if ((usecs = period_to_usecs(runtime)) >= 0) 457 pm_qos_add_request(&substream->latency_pm_qos_req, 458 PM_QOS_CPU_DMA_LATENCY, usecs); 459 return 0; 460 _error: 461 /* hardware might be unuseable from this time, 462 so we force application to retry to set 463 the correct hardware parameter settings */ 464 runtime->status->state = SNDRV_PCM_STATE_OPEN; 465 if (substream->ops->hw_free != NULL) 466 substream->ops->hw_free(substream); 467 return err; 468 } 469 470 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 471 struct snd_pcm_hw_params __user * _params) 472 { 473 struct snd_pcm_hw_params *params; 474 int err; 475 476 params = memdup_user(_params, sizeof(*params)); 477 if (IS_ERR(params)) 478 return PTR_ERR(params); 479 480 err = snd_pcm_hw_params(substream, params); 481 if (copy_to_user(_params, params, sizeof(*params))) { 482 if (!err) 483 err = -EFAULT; 484 } 485 486 kfree(params); 487 return err; 488 } 489 490 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 491 { 492 struct snd_pcm_runtime *runtime; 493 int result = 0; 494 495 if (PCM_RUNTIME_CHECK(substream)) 496 return -ENXIO; 497 runtime = substream->runtime; 498 snd_pcm_stream_lock_irq(substream); 499 switch (runtime->status->state) { 500 case SNDRV_PCM_STATE_SETUP: 501 case SNDRV_PCM_STATE_PREPARED: 502 break; 503 default: 504 snd_pcm_stream_unlock_irq(substream); 505 return -EBADFD; 506 } 507 snd_pcm_stream_unlock_irq(substream); 508 if (atomic_read(&substream->mmap_count)) 509 return -EBADFD; 510 if (substream->ops->hw_free) 511 result = substream->ops->hw_free(substream); 512 runtime->status->state = SNDRV_PCM_STATE_OPEN; 513 pm_qos_remove_request(&substream->latency_pm_qos_req); 514 return result; 515 } 516 517 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 518 struct snd_pcm_sw_params *params) 519 { 520 struct snd_pcm_runtime *runtime; 521 int err; 522 523 if (PCM_RUNTIME_CHECK(substream)) 524 return -ENXIO; 525 runtime = substream->runtime; 526 snd_pcm_stream_lock_irq(substream); 527 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 528 snd_pcm_stream_unlock_irq(substream); 529 return -EBADFD; 530 } 531 snd_pcm_stream_unlock_irq(substream); 532 533 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 534 return -EINVAL; 535 if (params->avail_min == 0) 536 return -EINVAL; 537 if (params->silence_size >= runtime->boundary) { 538 if (params->silence_threshold != 0) 539 return -EINVAL; 540 } else { 541 if (params->silence_size > params->silence_threshold) 542 return -EINVAL; 543 if (params->silence_threshold > runtime->buffer_size) 544 return -EINVAL; 545 } 546 err = 0; 547 snd_pcm_stream_lock_irq(substream); 548 runtime->tstamp_mode = params->tstamp_mode; 549 runtime->period_step = params->period_step; 550 runtime->control->avail_min = params->avail_min; 551 runtime->start_threshold = params->start_threshold; 552 runtime->stop_threshold = params->stop_threshold; 553 runtime->silence_threshold = params->silence_threshold; 554 runtime->silence_size = params->silence_size; 555 params->boundary = runtime->boundary; 556 if (snd_pcm_running(substream)) { 557 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 558 runtime->silence_size > 0) 559 snd_pcm_playback_silence(substream, ULONG_MAX); 560 err = snd_pcm_update_state(substream, runtime); 561 } 562 snd_pcm_stream_unlock_irq(substream); 563 return err; 564 } 565 566 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 567 struct snd_pcm_sw_params __user * _params) 568 { 569 struct snd_pcm_sw_params params; 570 int err; 571 if (copy_from_user(¶ms, _params, sizeof(params))) 572 return -EFAULT; 573 err = snd_pcm_sw_params(substream, ¶ms); 574 if (copy_to_user(_params, ¶ms, sizeof(params))) 575 return -EFAULT; 576 return err; 577 } 578 579 int snd_pcm_status(struct snd_pcm_substream *substream, 580 struct snd_pcm_status *status) 581 { 582 struct snd_pcm_runtime *runtime = substream->runtime; 583 584 snd_pcm_stream_lock_irq(substream); 585 status->state = runtime->status->state; 586 status->suspended_state = runtime->status->suspended_state; 587 if (status->state == SNDRV_PCM_STATE_OPEN) 588 goto _end; 589 status->trigger_tstamp = runtime->trigger_tstamp; 590 if (snd_pcm_running(substream)) { 591 snd_pcm_update_hw_ptr(substream); 592 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) { 593 status->tstamp = runtime->status->tstamp; 594 goto _tstamp_end; 595 } 596 } 597 snd_pcm_gettime(runtime, &status->tstamp); 598 _tstamp_end: 599 status->appl_ptr = runtime->control->appl_ptr; 600 status->hw_ptr = runtime->status->hw_ptr; 601 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 602 status->avail = snd_pcm_playback_avail(runtime); 603 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 604 runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 605 status->delay = runtime->buffer_size - status->avail; 606 status->delay += runtime->delay; 607 } else 608 status->delay = 0; 609 } else { 610 status->avail = snd_pcm_capture_avail(runtime); 611 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 612 status->delay = status->avail + runtime->delay; 613 else 614 status->delay = 0; 615 } 616 status->avail_max = runtime->avail_max; 617 status->overrange = runtime->overrange; 618 runtime->avail_max = 0; 619 runtime->overrange = 0; 620 _end: 621 snd_pcm_stream_unlock_irq(substream); 622 return 0; 623 } 624 625 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 626 struct snd_pcm_status __user * _status) 627 { 628 struct snd_pcm_status status; 629 int res; 630 631 memset(&status, 0, sizeof(status)); 632 res = snd_pcm_status(substream, &status); 633 if (res < 0) 634 return res; 635 if (copy_to_user(_status, &status, sizeof(status))) 636 return -EFAULT; 637 return 0; 638 } 639 640 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 641 struct snd_pcm_channel_info * info) 642 { 643 struct snd_pcm_runtime *runtime; 644 unsigned int channel; 645 646 channel = info->channel; 647 runtime = substream->runtime; 648 snd_pcm_stream_lock_irq(substream); 649 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 650 snd_pcm_stream_unlock_irq(substream); 651 return -EBADFD; 652 } 653 snd_pcm_stream_unlock_irq(substream); 654 if (channel >= runtime->channels) 655 return -EINVAL; 656 memset(info, 0, sizeof(*info)); 657 info->channel = channel; 658 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 659 } 660 661 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 662 struct snd_pcm_channel_info __user * _info) 663 { 664 struct snd_pcm_channel_info info; 665 int res; 666 667 if (copy_from_user(&info, _info, sizeof(info))) 668 return -EFAULT; 669 res = snd_pcm_channel_info(substream, &info); 670 if (res < 0) 671 return res; 672 if (copy_to_user(_info, &info, sizeof(info))) 673 return -EFAULT; 674 return 0; 675 } 676 677 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 678 { 679 struct snd_pcm_runtime *runtime = substream->runtime; 680 if (runtime->trigger_master == NULL) 681 return; 682 if (runtime->trigger_master == substream) { 683 snd_pcm_gettime(runtime, &runtime->trigger_tstamp); 684 } else { 685 snd_pcm_trigger_tstamp(runtime->trigger_master); 686 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 687 } 688 runtime->trigger_master = NULL; 689 } 690 691 struct action_ops { 692 int (*pre_action)(struct snd_pcm_substream *substream, int state); 693 int (*do_action)(struct snd_pcm_substream *substream, int state); 694 void (*undo_action)(struct snd_pcm_substream *substream, int state); 695 void (*post_action)(struct snd_pcm_substream *substream, int state); 696 }; 697 698 /* 699 * this functions is core for handling of linked stream 700 * Note: the stream state might be changed also on failure 701 * Note2: call with calling stream lock + link lock 702 */ 703 static int snd_pcm_action_group(struct action_ops *ops, 704 struct snd_pcm_substream *substream, 705 int state, int do_lock) 706 { 707 struct snd_pcm_substream *s = NULL; 708 struct snd_pcm_substream *s1; 709 int res = 0; 710 711 snd_pcm_group_for_each_entry(s, substream) { 712 if (do_lock && s != substream) 713 spin_lock_nested(&s->self_group.lock, 714 SINGLE_DEPTH_NESTING); 715 res = ops->pre_action(s, state); 716 if (res < 0) 717 goto _unlock; 718 } 719 snd_pcm_group_for_each_entry(s, substream) { 720 res = ops->do_action(s, state); 721 if (res < 0) { 722 if (ops->undo_action) { 723 snd_pcm_group_for_each_entry(s1, substream) { 724 if (s1 == s) /* failed stream */ 725 break; 726 ops->undo_action(s1, state); 727 } 728 } 729 s = NULL; /* unlock all */ 730 goto _unlock; 731 } 732 } 733 snd_pcm_group_for_each_entry(s, substream) { 734 ops->post_action(s, state); 735 } 736 _unlock: 737 if (do_lock) { 738 /* unlock streams */ 739 snd_pcm_group_for_each_entry(s1, substream) { 740 if (s1 != substream) 741 spin_unlock(&s1->self_group.lock); 742 if (s1 == s) /* end */ 743 break; 744 } 745 } 746 return res; 747 } 748 749 /* 750 * Note: call with stream lock 751 */ 752 static int snd_pcm_action_single(struct action_ops *ops, 753 struct snd_pcm_substream *substream, 754 int state) 755 { 756 int res; 757 758 res = ops->pre_action(substream, state); 759 if (res < 0) 760 return res; 761 res = ops->do_action(substream, state); 762 if (res == 0) 763 ops->post_action(substream, state); 764 else if (ops->undo_action) 765 ops->undo_action(substream, state); 766 return res; 767 } 768 769 /* 770 * Note: call with stream lock 771 */ 772 static int snd_pcm_action(struct action_ops *ops, 773 struct snd_pcm_substream *substream, 774 int state) 775 { 776 int res; 777 778 if (snd_pcm_stream_linked(substream)) { 779 if (!spin_trylock(&substream->group->lock)) { 780 spin_unlock(&substream->self_group.lock); 781 spin_lock(&substream->group->lock); 782 spin_lock(&substream->self_group.lock); 783 } 784 res = snd_pcm_action_group(ops, substream, state, 1); 785 spin_unlock(&substream->group->lock); 786 } else { 787 res = snd_pcm_action_single(ops, substream, state); 788 } 789 return res; 790 } 791 792 /* 793 * Note: don't use any locks before 794 */ 795 static int snd_pcm_action_lock_irq(struct action_ops *ops, 796 struct snd_pcm_substream *substream, 797 int state) 798 { 799 int res; 800 801 read_lock_irq(&snd_pcm_link_rwlock); 802 if (snd_pcm_stream_linked(substream)) { 803 spin_lock(&substream->group->lock); 804 spin_lock(&substream->self_group.lock); 805 res = snd_pcm_action_group(ops, substream, state, 1); 806 spin_unlock(&substream->self_group.lock); 807 spin_unlock(&substream->group->lock); 808 } else { 809 spin_lock(&substream->self_group.lock); 810 res = snd_pcm_action_single(ops, substream, state); 811 spin_unlock(&substream->self_group.lock); 812 } 813 read_unlock_irq(&snd_pcm_link_rwlock); 814 return res; 815 } 816 817 /* 818 */ 819 static int snd_pcm_action_nonatomic(struct action_ops *ops, 820 struct snd_pcm_substream *substream, 821 int state) 822 { 823 int res; 824 825 down_read(&snd_pcm_link_rwsem); 826 if (snd_pcm_stream_linked(substream)) 827 res = snd_pcm_action_group(ops, substream, state, 0); 828 else 829 res = snd_pcm_action_single(ops, substream, state); 830 up_read(&snd_pcm_link_rwsem); 831 return res; 832 } 833 834 /* 835 * start callbacks 836 */ 837 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 838 { 839 struct snd_pcm_runtime *runtime = substream->runtime; 840 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 841 return -EBADFD; 842 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 843 !snd_pcm_playback_data(substream)) 844 return -EPIPE; 845 runtime->trigger_master = substream; 846 return 0; 847 } 848 849 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 850 { 851 if (substream->runtime->trigger_master != substream) 852 return 0; 853 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 854 } 855 856 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 857 { 858 if (substream->runtime->trigger_master == substream) 859 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 860 } 861 862 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 863 { 864 struct snd_pcm_runtime *runtime = substream->runtime; 865 snd_pcm_trigger_tstamp(substream); 866 runtime->hw_ptr_jiffies = jiffies; 867 runtime->status->state = state; 868 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 869 runtime->silence_size > 0) 870 snd_pcm_playback_silence(substream, ULONG_MAX); 871 if (substream->timer) 872 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, 873 &runtime->trigger_tstamp); 874 } 875 876 static struct action_ops snd_pcm_action_start = { 877 .pre_action = snd_pcm_pre_start, 878 .do_action = snd_pcm_do_start, 879 .undo_action = snd_pcm_undo_start, 880 .post_action = snd_pcm_post_start 881 }; 882 883 /** 884 * snd_pcm_start - start all linked streams 885 * @substream: the PCM substream instance 886 */ 887 int snd_pcm_start(struct snd_pcm_substream *substream) 888 { 889 return snd_pcm_action(&snd_pcm_action_start, substream, 890 SNDRV_PCM_STATE_RUNNING); 891 } 892 893 /* 894 * stop callbacks 895 */ 896 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 897 { 898 struct snd_pcm_runtime *runtime = substream->runtime; 899 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 900 return -EBADFD; 901 runtime->trigger_master = substream; 902 return 0; 903 } 904 905 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 906 { 907 if (substream->runtime->trigger_master == substream && 908 snd_pcm_running(substream)) 909 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 910 return 0; /* unconditonally stop all substreams */ 911 } 912 913 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 914 { 915 struct snd_pcm_runtime *runtime = substream->runtime; 916 if (runtime->status->state != state) { 917 snd_pcm_trigger_tstamp(substream); 918 if (substream->timer) 919 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 920 &runtime->trigger_tstamp); 921 runtime->status->state = state; 922 } 923 wake_up(&runtime->sleep); 924 wake_up(&runtime->tsleep); 925 } 926 927 static struct action_ops snd_pcm_action_stop = { 928 .pre_action = snd_pcm_pre_stop, 929 .do_action = snd_pcm_do_stop, 930 .post_action = snd_pcm_post_stop 931 }; 932 933 /** 934 * snd_pcm_stop - try to stop all running streams in the substream group 935 * @substream: the PCM substream instance 936 * @state: PCM state after stopping the stream 937 * 938 * The state of each stream is then changed to the given state unconditionally. 939 */ 940 int snd_pcm_stop(struct snd_pcm_substream *substream, int state) 941 { 942 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 943 } 944 945 EXPORT_SYMBOL(snd_pcm_stop); 946 947 /** 948 * snd_pcm_drain_done - stop the DMA only when the given stream is playback 949 * @substream: the PCM substream 950 * 951 * After stopping, the state is changed to SETUP. 952 * Unlike snd_pcm_stop(), this affects only the given stream. 953 */ 954 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 955 { 956 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 957 SNDRV_PCM_STATE_SETUP); 958 } 959 960 /* 961 * pause callbacks 962 */ 963 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 964 { 965 struct snd_pcm_runtime *runtime = substream->runtime; 966 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 967 return -ENOSYS; 968 if (push) { 969 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 970 return -EBADFD; 971 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 972 return -EBADFD; 973 runtime->trigger_master = substream; 974 return 0; 975 } 976 977 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 978 { 979 if (substream->runtime->trigger_master != substream) 980 return 0; 981 /* some drivers might use hw_ptr to recover from the pause - 982 update the hw_ptr now */ 983 if (push) 984 snd_pcm_update_hw_ptr(substream); 985 /* The jiffies check in snd_pcm_update_hw_ptr*() is done by 986 * a delta betwen the current jiffies, this gives a large enough 987 * delta, effectively to skip the check once. 988 */ 989 substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000; 990 return substream->ops->trigger(substream, 991 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 992 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 993 } 994 995 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 996 { 997 if (substream->runtime->trigger_master == substream) 998 substream->ops->trigger(substream, 999 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1000 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1001 } 1002 1003 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1004 { 1005 struct snd_pcm_runtime *runtime = substream->runtime; 1006 snd_pcm_trigger_tstamp(substream); 1007 if (push) { 1008 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1009 if (substream->timer) 1010 snd_timer_notify(substream->timer, 1011 SNDRV_TIMER_EVENT_MPAUSE, 1012 &runtime->trigger_tstamp); 1013 wake_up(&runtime->sleep); 1014 wake_up(&runtime->tsleep); 1015 } else { 1016 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1017 if (substream->timer) 1018 snd_timer_notify(substream->timer, 1019 SNDRV_TIMER_EVENT_MCONTINUE, 1020 &runtime->trigger_tstamp); 1021 } 1022 } 1023 1024 static struct action_ops snd_pcm_action_pause = { 1025 .pre_action = snd_pcm_pre_pause, 1026 .do_action = snd_pcm_do_pause, 1027 .undo_action = snd_pcm_undo_pause, 1028 .post_action = snd_pcm_post_pause 1029 }; 1030 1031 /* 1032 * Push/release the pause for all linked streams. 1033 */ 1034 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1035 { 1036 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1037 } 1038 1039 #ifdef CONFIG_PM 1040 /* suspend */ 1041 1042 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1043 { 1044 struct snd_pcm_runtime *runtime = substream->runtime; 1045 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1046 return -EBUSY; 1047 runtime->trigger_master = substream; 1048 return 0; 1049 } 1050 1051 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1052 { 1053 struct snd_pcm_runtime *runtime = substream->runtime; 1054 if (runtime->trigger_master != substream) 1055 return 0; 1056 if (! snd_pcm_running(substream)) 1057 return 0; 1058 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1059 return 0; /* suspend unconditionally */ 1060 } 1061 1062 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1063 { 1064 struct snd_pcm_runtime *runtime = substream->runtime; 1065 snd_pcm_trigger_tstamp(substream); 1066 if (substream->timer) 1067 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1068 &runtime->trigger_tstamp); 1069 runtime->status->suspended_state = runtime->status->state; 1070 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1071 wake_up(&runtime->sleep); 1072 wake_up(&runtime->tsleep); 1073 } 1074 1075 static struct action_ops snd_pcm_action_suspend = { 1076 .pre_action = snd_pcm_pre_suspend, 1077 .do_action = snd_pcm_do_suspend, 1078 .post_action = snd_pcm_post_suspend 1079 }; 1080 1081 /** 1082 * snd_pcm_suspend - trigger SUSPEND to all linked streams 1083 * @substream: the PCM substream 1084 * 1085 * After this call, all streams are changed to SUSPENDED state. 1086 */ 1087 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1088 { 1089 int err; 1090 unsigned long flags; 1091 1092 if (! substream) 1093 return 0; 1094 1095 snd_pcm_stream_lock_irqsave(substream, flags); 1096 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1097 snd_pcm_stream_unlock_irqrestore(substream, flags); 1098 return err; 1099 } 1100 1101 EXPORT_SYMBOL(snd_pcm_suspend); 1102 1103 /** 1104 * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm 1105 * @pcm: the PCM instance 1106 * 1107 * After this call, all streams are changed to SUSPENDED state. 1108 */ 1109 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1110 { 1111 struct snd_pcm_substream *substream; 1112 int stream, err = 0; 1113 1114 if (! pcm) 1115 return 0; 1116 1117 for (stream = 0; stream < 2; stream++) { 1118 for (substream = pcm->streams[stream].substream; 1119 substream; substream = substream->next) { 1120 /* FIXME: the open/close code should lock this as well */ 1121 if (substream->runtime == NULL) 1122 continue; 1123 err = snd_pcm_suspend(substream); 1124 if (err < 0 && err != -EBUSY) 1125 return err; 1126 } 1127 } 1128 return 0; 1129 } 1130 1131 EXPORT_SYMBOL(snd_pcm_suspend_all); 1132 1133 /* resume */ 1134 1135 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1136 { 1137 struct snd_pcm_runtime *runtime = substream->runtime; 1138 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1139 return -ENOSYS; 1140 runtime->trigger_master = substream; 1141 return 0; 1142 } 1143 1144 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1145 { 1146 struct snd_pcm_runtime *runtime = substream->runtime; 1147 if (runtime->trigger_master != substream) 1148 return 0; 1149 /* DMA not running previously? */ 1150 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1151 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1152 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1153 return 0; 1154 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1155 } 1156 1157 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1158 { 1159 if (substream->runtime->trigger_master == substream && 1160 snd_pcm_running(substream)) 1161 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1162 } 1163 1164 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1165 { 1166 struct snd_pcm_runtime *runtime = substream->runtime; 1167 snd_pcm_trigger_tstamp(substream); 1168 if (substream->timer) 1169 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1170 &runtime->trigger_tstamp); 1171 runtime->status->state = runtime->status->suspended_state; 1172 } 1173 1174 static struct action_ops snd_pcm_action_resume = { 1175 .pre_action = snd_pcm_pre_resume, 1176 .do_action = snd_pcm_do_resume, 1177 .undo_action = snd_pcm_undo_resume, 1178 .post_action = snd_pcm_post_resume 1179 }; 1180 1181 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1182 { 1183 struct snd_card *card = substream->pcm->card; 1184 int res; 1185 1186 snd_power_lock(card); 1187 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1188 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1189 snd_power_unlock(card); 1190 return res; 1191 } 1192 1193 #else 1194 1195 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1196 { 1197 return -ENOSYS; 1198 } 1199 1200 #endif /* CONFIG_PM */ 1201 1202 /* 1203 * xrun ioctl 1204 * 1205 * Change the RUNNING stream(s) to XRUN state. 1206 */ 1207 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1208 { 1209 struct snd_card *card = substream->pcm->card; 1210 struct snd_pcm_runtime *runtime = substream->runtime; 1211 int result; 1212 1213 snd_power_lock(card); 1214 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1215 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1216 if (result < 0) 1217 goto _unlock; 1218 } 1219 1220 snd_pcm_stream_lock_irq(substream); 1221 switch (runtime->status->state) { 1222 case SNDRV_PCM_STATE_XRUN: 1223 result = 0; /* already there */ 1224 break; 1225 case SNDRV_PCM_STATE_RUNNING: 1226 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1227 break; 1228 default: 1229 result = -EBADFD; 1230 } 1231 snd_pcm_stream_unlock_irq(substream); 1232 _unlock: 1233 snd_power_unlock(card); 1234 return result; 1235 } 1236 1237 /* 1238 * reset ioctl 1239 */ 1240 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1241 { 1242 struct snd_pcm_runtime *runtime = substream->runtime; 1243 switch (runtime->status->state) { 1244 case SNDRV_PCM_STATE_RUNNING: 1245 case SNDRV_PCM_STATE_PREPARED: 1246 case SNDRV_PCM_STATE_PAUSED: 1247 case SNDRV_PCM_STATE_SUSPENDED: 1248 return 0; 1249 default: 1250 return -EBADFD; 1251 } 1252 } 1253 1254 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1255 { 1256 struct snd_pcm_runtime *runtime = substream->runtime; 1257 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1258 if (err < 0) 1259 return err; 1260 runtime->hw_ptr_base = 0; 1261 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1262 runtime->status->hw_ptr % runtime->period_size; 1263 runtime->silence_start = runtime->status->hw_ptr; 1264 runtime->silence_filled = 0; 1265 return 0; 1266 } 1267 1268 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1269 { 1270 struct snd_pcm_runtime *runtime = substream->runtime; 1271 runtime->control->appl_ptr = runtime->status->hw_ptr; 1272 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1273 runtime->silence_size > 0) 1274 snd_pcm_playback_silence(substream, ULONG_MAX); 1275 } 1276 1277 static struct action_ops snd_pcm_action_reset = { 1278 .pre_action = snd_pcm_pre_reset, 1279 .do_action = snd_pcm_do_reset, 1280 .post_action = snd_pcm_post_reset 1281 }; 1282 1283 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1284 { 1285 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1286 } 1287 1288 /* 1289 * prepare ioctl 1290 */ 1291 /* we use the second argument for updating f_flags */ 1292 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1293 int f_flags) 1294 { 1295 struct snd_pcm_runtime *runtime = substream->runtime; 1296 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1297 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1298 return -EBADFD; 1299 if (snd_pcm_running(substream)) 1300 return -EBUSY; 1301 substream->f_flags = f_flags; 1302 return 0; 1303 } 1304 1305 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1306 { 1307 int err; 1308 err = substream->ops->prepare(substream); 1309 if (err < 0) 1310 return err; 1311 return snd_pcm_do_reset(substream, 0); 1312 } 1313 1314 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1315 { 1316 struct snd_pcm_runtime *runtime = substream->runtime; 1317 runtime->control->appl_ptr = runtime->status->hw_ptr; 1318 runtime->status->state = SNDRV_PCM_STATE_PREPARED; 1319 } 1320 1321 static struct action_ops snd_pcm_action_prepare = { 1322 .pre_action = snd_pcm_pre_prepare, 1323 .do_action = snd_pcm_do_prepare, 1324 .post_action = snd_pcm_post_prepare 1325 }; 1326 1327 /** 1328 * snd_pcm_prepare - prepare the PCM substream to be triggerable 1329 * @substream: the PCM substream instance 1330 * @file: file to refer f_flags 1331 */ 1332 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1333 struct file *file) 1334 { 1335 int res; 1336 struct snd_card *card = substream->pcm->card; 1337 int f_flags; 1338 1339 if (file) 1340 f_flags = file->f_flags; 1341 else 1342 f_flags = substream->f_flags; 1343 1344 snd_power_lock(card); 1345 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1346 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1347 substream, f_flags); 1348 snd_power_unlock(card); 1349 return res; 1350 } 1351 1352 /* 1353 * drain ioctl 1354 */ 1355 1356 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1357 { 1358 substream->runtime->trigger_master = substream; 1359 return 0; 1360 } 1361 1362 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1363 { 1364 struct snd_pcm_runtime *runtime = substream->runtime; 1365 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1366 switch (runtime->status->state) { 1367 case SNDRV_PCM_STATE_PREPARED: 1368 /* start playback stream if possible */ 1369 if (! snd_pcm_playback_empty(substream)) { 1370 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1371 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1372 } 1373 break; 1374 case SNDRV_PCM_STATE_RUNNING: 1375 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1376 break; 1377 default: 1378 break; 1379 } 1380 } else { 1381 /* stop running stream */ 1382 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1383 int new_state = snd_pcm_capture_avail(runtime) > 0 ? 1384 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1385 snd_pcm_do_stop(substream, new_state); 1386 snd_pcm_post_stop(substream, new_state); 1387 } 1388 } 1389 return 0; 1390 } 1391 1392 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1393 { 1394 } 1395 1396 static struct action_ops snd_pcm_action_drain_init = { 1397 .pre_action = snd_pcm_pre_drain_init, 1398 .do_action = snd_pcm_do_drain_init, 1399 .post_action = snd_pcm_post_drain_init 1400 }; 1401 1402 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1403 1404 /* 1405 * Drain the stream(s). 1406 * When the substream is linked, sync until the draining of all playback streams 1407 * is finished. 1408 * After this call, all streams are supposed to be either SETUP or DRAINING 1409 * (capture only) state. 1410 */ 1411 static int snd_pcm_drain(struct snd_pcm_substream *substream, 1412 struct file *file) 1413 { 1414 struct snd_card *card; 1415 struct snd_pcm_runtime *runtime; 1416 struct snd_pcm_substream *s; 1417 wait_queue_t wait; 1418 int result = 0; 1419 int nonblock = 0; 1420 1421 card = substream->pcm->card; 1422 runtime = substream->runtime; 1423 1424 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1425 return -EBADFD; 1426 1427 snd_power_lock(card); 1428 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1429 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1430 if (result < 0) { 1431 snd_power_unlock(card); 1432 return result; 1433 } 1434 } 1435 1436 if (file) { 1437 if (file->f_flags & O_NONBLOCK) 1438 nonblock = 1; 1439 } else if (substream->f_flags & O_NONBLOCK) 1440 nonblock = 1; 1441 1442 down_read(&snd_pcm_link_rwsem); 1443 snd_pcm_stream_lock_irq(substream); 1444 /* resume pause */ 1445 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1446 snd_pcm_pause(substream, 0); 1447 1448 /* pre-start/stop - all running streams are changed to DRAINING state */ 1449 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1450 if (result < 0) 1451 goto unlock; 1452 /* in non-blocking, we don't wait in ioctl but let caller poll */ 1453 if (nonblock) { 1454 result = -EAGAIN; 1455 goto unlock; 1456 } 1457 1458 for (;;) { 1459 long tout; 1460 struct snd_pcm_runtime *to_check; 1461 if (signal_pending(current)) { 1462 result = -ERESTARTSYS; 1463 break; 1464 } 1465 /* find a substream to drain */ 1466 to_check = NULL; 1467 snd_pcm_group_for_each_entry(s, substream) { 1468 if (s->stream != SNDRV_PCM_STREAM_PLAYBACK) 1469 continue; 1470 runtime = s->runtime; 1471 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 1472 to_check = runtime; 1473 break; 1474 } 1475 } 1476 if (!to_check) 1477 break; /* all drained */ 1478 init_waitqueue_entry(&wait, current); 1479 add_wait_queue(&to_check->sleep, &wait); 1480 set_current_state(TASK_INTERRUPTIBLE); 1481 snd_pcm_stream_unlock_irq(substream); 1482 up_read(&snd_pcm_link_rwsem); 1483 snd_power_unlock(card); 1484 tout = schedule_timeout(10 * HZ); 1485 snd_power_lock(card); 1486 down_read(&snd_pcm_link_rwsem); 1487 snd_pcm_stream_lock_irq(substream); 1488 remove_wait_queue(&to_check->sleep, &wait); 1489 if (tout == 0) { 1490 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1491 result = -ESTRPIPE; 1492 else { 1493 snd_printd("playback drain error (DMA or IRQ trouble?)\n"); 1494 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1495 result = -EIO; 1496 } 1497 break; 1498 } 1499 } 1500 1501 unlock: 1502 snd_pcm_stream_unlock_irq(substream); 1503 up_read(&snd_pcm_link_rwsem); 1504 snd_power_unlock(card); 1505 1506 return result; 1507 } 1508 1509 /* 1510 * drop ioctl 1511 * 1512 * Immediately put all linked substreams into SETUP state. 1513 */ 1514 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1515 { 1516 struct snd_pcm_runtime *runtime; 1517 struct snd_card *card; 1518 int result = 0; 1519 1520 if (PCM_RUNTIME_CHECK(substream)) 1521 return -ENXIO; 1522 runtime = substream->runtime; 1523 card = substream->pcm->card; 1524 1525 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1526 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED || 1527 runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1528 return -EBADFD; 1529 1530 snd_pcm_stream_lock_irq(substream); 1531 /* resume pause */ 1532 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1533 snd_pcm_pause(substream, 0); 1534 1535 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1536 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1537 snd_pcm_stream_unlock_irq(substream); 1538 1539 return result; 1540 } 1541 1542 1543 /* WARNING: Don't forget to fput back the file */ 1544 static struct file *snd_pcm_file_fd(int fd) 1545 { 1546 struct file *file; 1547 struct inode *inode; 1548 unsigned int minor; 1549 1550 file = fget(fd); 1551 if (!file) 1552 return NULL; 1553 inode = file->f_path.dentry->d_inode; 1554 if (!S_ISCHR(inode->i_mode) || 1555 imajor(inode) != snd_major) { 1556 fput(file); 1557 return NULL; 1558 } 1559 minor = iminor(inode); 1560 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) && 1561 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) { 1562 fput(file); 1563 return NULL; 1564 } 1565 return file; 1566 } 1567 1568 /* 1569 * PCM link handling 1570 */ 1571 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1572 { 1573 int res = 0; 1574 struct file *file; 1575 struct snd_pcm_file *pcm_file; 1576 struct snd_pcm_substream *substream1; 1577 1578 file = snd_pcm_file_fd(fd); 1579 if (!file) 1580 return -EBADFD; 1581 pcm_file = file->private_data; 1582 substream1 = pcm_file->substream; 1583 down_write(&snd_pcm_link_rwsem); 1584 write_lock_irq(&snd_pcm_link_rwlock); 1585 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1586 substream->runtime->status->state != substream1->runtime->status->state) { 1587 res = -EBADFD; 1588 goto _end; 1589 } 1590 if (snd_pcm_stream_linked(substream1)) { 1591 res = -EALREADY; 1592 goto _end; 1593 } 1594 if (!snd_pcm_stream_linked(substream)) { 1595 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC); 1596 if (substream->group == NULL) { 1597 res = -ENOMEM; 1598 goto _end; 1599 } 1600 spin_lock_init(&substream->group->lock); 1601 INIT_LIST_HEAD(&substream->group->substreams); 1602 list_add_tail(&substream->link_list, &substream->group->substreams); 1603 substream->group->count = 1; 1604 } 1605 list_add_tail(&substream1->link_list, &substream->group->substreams); 1606 substream->group->count++; 1607 substream1->group = substream->group; 1608 _end: 1609 write_unlock_irq(&snd_pcm_link_rwlock); 1610 up_write(&snd_pcm_link_rwsem); 1611 fput(file); 1612 return res; 1613 } 1614 1615 static void relink_to_local(struct snd_pcm_substream *substream) 1616 { 1617 substream->group = &substream->self_group; 1618 INIT_LIST_HEAD(&substream->self_group.substreams); 1619 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1620 } 1621 1622 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1623 { 1624 struct snd_pcm_substream *s; 1625 int res = 0; 1626 1627 down_write(&snd_pcm_link_rwsem); 1628 write_lock_irq(&snd_pcm_link_rwlock); 1629 if (!snd_pcm_stream_linked(substream)) { 1630 res = -EALREADY; 1631 goto _end; 1632 } 1633 list_del(&substream->link_list); 1634 substream->group->count--; 1635 if (substream->group->count == 1) { /* detach the last stream, too */ 1636 snd_pcm_group_for_each_entry(s, substream) { 1637 relink_to_local(s); 1638 break; 1639 } 1640 kfree(substream->group); 1641 } 1642 relink_to_local(substream); 1643 _end: 1644 write_unlock_irq(&snd_pcm_link_rwlock); 1645 up_write(&snd_pcm_link_rwsem); 1646 return res; 1647 } 1648 1649 /* 1650 * hw configurator 1651 */ 1652 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1653 struct snd_pcm_hw_rule *rule) 1654 { 1655 struct snd_interval t; 1656 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1657 hw_param_interval_c(params, rule->deps[1]), &t); 1658 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1659 } 1660 1661 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1662 struct snd_pcm_hw_rule *rule) 1663 { 1664 struct snd_interval t; 1665 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1666 hw_param_interval_c(params, rule->deps[1]), &t); 1667 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1668 } 1669 1670 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1671 struct snd_pcm_hw_rule *rule) 1672 { 1673 struct snd_interval t; 1674 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1675 hw_param_interval_c(params, rule->deps[1]), 1676 (unsigned long) rule->private, &t); 1677 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1678 } 1679 1680 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1681 struct snd_pcm_hw_rule *rule) 1682 { 1683 struct snd_interval t; 1684 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1685 (unsigned long) rule->private, 1686 hw_param_interval_c(params, rule->deps[1]), &t); 1687 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1688 } 1689 1690 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1691 struct snd_pcm_hw_rule *rule) 1692 { 1693 unsigned int k; 1694 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1695 struct snd_mask m; 1696 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1697 snd_mask_any(&m); 1698 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1699 int bits; 1700 if (! snd_mask_test(mask, k)) 1701 continue; 1702 bits = snd_pcm_format_physical_width(k); 1703 if (bits <= 0) 1704 continue; /* ignore invalid formats */ 1705 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1706 snd_mask_reset(&m, k); 1707 } 1708 return snd_mask_refine(mask, &m); 1709 } 1710 1711 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1712 struct snd_pcm_hw_rule *rule) 1713 { 1714 struct snd_interval t; 1715 unsigned int k; 1716 t.min = UINT_MAX; 1717 t.max = 0; 1718 t.openmin = 0; 1719 t.openmax = 0; 1720 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1721 int bits; 1722 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1723 continue; 1724 bits = snd_pcm_format_physical_width(k); 1725 if (bits <= 0) 1726 continue; /* ignore invalid formats */ 1727 if (t.min > (unsigned)bits) 1728 t.min = bits; 1729 if (t.max < (unsigned)bits) 1730 t.max = bits; 1731 } 1732 t.integer = 1; 1733 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1734 } 1735 1736 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1737 #error "Change this table" 1738 #endif 1739 1740 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1741 48000, 64000, 88200, 96000, 176400, 192000 }; 1742 1743 const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = { 1744 .count = ARRAY_SIZE(rates), 1745 .list = rates, 1746 }; 1747 1748 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1749 struct snd_pcm_hw_rule *rule) 1750 { 1751 struct snd_pcm_hardware *hw = rule->private; 1752 return snd_interval_list(hw_param_interval(params, rule->var), 1753 snd_pcm_known_rates.count, 1754 snd_pcm_known_rates.list, hw->rates); 1755 } 1756 1757 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1758 struct snd_pcm_hw_rule *rule) 1759 { 1760 struct snd_interval t; 1761 struct snd_pcm_substream *substream = rule->private; 1762 t.min = 0; 1763 t.max = substream->buffer_bytes_max; 1764 t.openmin = 0; 1765 t.openmax = 0; 1766 t.integer = 1; 1767 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1768 } 1769 1770 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1771 { 1772 struct snd_pcm_runtime *runtime = substream->runtime; 1773 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1774 int k, err; 1775 1776 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1777 snd_mask_any(constrs_mask(constrs, k)); 1778 } 1779 1780 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1781 snd_interval_any(constrs_interval(constrs, k)); 1782 } 1783 1784 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1785 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1786 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1787 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1788 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1789 1790 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1791 snd_pcm_hw_rule_format, NULL, 1792 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1793 if (err < 0) 1794 return err; 1795 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1796 snd_pcm_hw_rule_sample_bits, NULL, 1797 SNDRV_PCM_HW_PARAM_FORMAT, 1798 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1799 if (err < 0) 1800 return err; 1801 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1802 snd_pcm_hw_rule_div, NULL, 1803 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1804 if (err < 0) 1805 return err; 1806 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1807 snd_pcm_hw_rule_mul, NULL, 1808 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1809 if (err < 0) 1810 return err; 1811 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1812 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1813 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1814 if (err < 0) 1815 return err; 1816 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1817 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1818 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 1819 if (err < 0) 1820 return err; 1821 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1822 snd_pcm_hw_rule_div, NULL, 1823 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1824 if (err < 0) 1825 return err; 1826 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1827 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1828 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 1829 if (err < 0) 1830 return err; 1831 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1832 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1833 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 1834 if (err < 0) 1835 return err; 1836 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 1837 snd_pcm_hw_rule_div, NULL, 1838 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1839 if (err < 0) 1840 return err; 1841 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1842 snd_pcm_hw_rule_div, NULL, 1843 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1844 if (err < 0) 1845 return err; 1846 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1847 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1848 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1849 if (err < 0) 1850 return err; 1851 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1852 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1853 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1854 if (err < 0) 1855 return err; 1856 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1857 snd_pcm_hw_rule_mul, NULL, 1858 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1859 if (err < 0) 1860 return err; 1861 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1862 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1863 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1864 if (err < 0) 1865 return err; 1866 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1867 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1868 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1869 if (err < 0) 1870 return err; 1871 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1872 snd_pcm_hw_rule_muldivk, (void*) 8, 1873 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1874 if (err < 0) 1875 return err; 1876 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1877 snd_pcm_hw_rule_muldivk, (void*) 8, 1878 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1879 if (err < 0) 1880 return err; 1881 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1882 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1883 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1884 if (err < 0) 1885 return err; 1886 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 1887 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1888 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1889 if (err < 0) 1890 return err; 1891 return 0; 1892 } 1893 1894 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 1895 { 1896 struct snd_pcm_runtime *runtime = substream->runtime; 1897 struct snd_pcm_hardware *hw = &runtime->hw; 1898 int err; 1899 unsigned int mask = 0; 1900 1901 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1902 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 1903 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1904 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 1905 if (hw->info & SNDRV_PCM_INFO_MMAP) { 1906 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1907 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 1908 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1909 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 1910 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 1911 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 1912 } 1913 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 1914 if (err < 0) 1915 return err; 1916 1917 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 1918 if (err < 0) 1919 return err; 1920 1921 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 1922 if (err < 0) 1923 return err; 1924 1925 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 1926 hw->channels_min, hw->channels_max); 1927 if (err < 0) 1928 return err; 1929 1930 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 1931 hw->rate_min, hw->rate_max); 1932 if (err < 0) 1933 return err; 1934 1935 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1936 hw->period_bytes_min, hw->period_bytes_max); 1937 if (err < 0) 1938 return err; 1939 1940 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 1941 hw->periods_min, hw->periods_max); 1942 if (err < 0) 1943 return err; 1944 1945 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1946 hw->period_bytes_min, hw->buffer_bytes_max); 1947 if (err < 0) 1948 return err; 1949 1950 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1951 snd_pcm_hw_rule_buffer_bytes_max, substream, 1952 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 1953 if (err < 0) 1954 return err; 1955 1956 /* FIXME: remove */ 1957 if (runtime->dma_bytes) { 1958 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 1959 if (err < 0) 1960 return -EINVAL; 1961 } 1962 1963 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 1964 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1965 snd_pcm_hw_rule_rate, hw, 1966 SNDRV_PCM_HW_PARAM_RATE, -1); 1967 if (err < 0) 1968 return err; 1969 } 1970 1971 /* FIXME: this belong to lowlevel */ 1972 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 1973 1974 return 0; 1975 } 1976 1977 static void pcm_release_private(struct snd_pcm_substream *substream) 1978 { 1979 snd_pcm_unlink(substream); 1980 } 1981 1982 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 1983 { 1984 substream->ref_count--; 1985 if (substream->ref_count > 0) 1986 return; 1987 1988 snd_pcm_drop(substream); 1989 if (substream->hw_opened) { 1990 if (substream->ops->hw_free != NULL) 1991 substream->ops->hw_free(substream); 1992 substream->ops->close(substream); 1993 substream->hw_opened = 0; 1994 } 1995 if (substream->pcm_release) { 1996 substream->pcm_release(substream); 1997 substream->pcm_release = NULL; 1998 } 1999 snd_pcm_detach_substream(substream); 2000 } 2001 2002 EXPORT_SYMBOL(snd_pcm_release_substream); 2003 2004 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2005 struct file *file, 2006 struct snd_pcm_substream **rsubstream) 2007 { 2008 struct snd_pcm_substream *substream; 2009 int err; 2010 2011 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2012 if (err < 0) 2013 return err; 2014 if (substream->ref_count > 1) { 2015 *rsubstream = substream; 2016 return 0; 2017 } 2018 2019 err = snd_pcm_hw_constraints_init(substream); 2020 if (err < 0) { 2021 snd_printd("snd_pcm_hw_constraints_init failed\n"); 2022 goto error; 2023 } 2024 2025 if ((err = substream->ops->open(substream)) < 0) 2026 goto error; 2027 2028 substream->hw_opened = 1; 2029 2030 err = snd_pcm_hw_constraints_complete(substream); 2031 if (err < 0) { 2032 snd_printd("snd_pcm_hw_constraints_complete failed\n"); 2033 goto error; 2034 } 2035 2036 *rsubstream = substream; 2037 return 0; 2038 2039 error: 2040 snd_pcm_release_substream(substream); 2041 return err; 2042 } 2043 2044 EXPORT_SYMBOL(snd_pcm_open_substream); 2045 2046 static int snd_pcm_open_file(struct file *file, 2047 struct snd_pcm *pcm, 2048 int stream, 2049 struct snd_pcm_file **rpcm_file) 2050 { 2051 struct snd_pcm_file *pcm_file; 2052 struct snd_pcm_substream *substream; 2053 struct snd_pcm_str *str; 2054 int err; 2055 2056 if (rpcm_file) 2057 *rpcm_file = NULL; 2058 2059 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2060 if (err < 0) 2061 return err; 2062 2063 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2064 if (pcm_file == NULL) { 2065 snd_pcm_release_substream(substream); 2066 return -ENOMEM; 2067 } 2068 pcm_file->substream = substream; 2069 if (substream->ref_count == 1) { 2070 str = substream->pstr; 2071 substream->file = pcm_file; 2072 substream->pcm_release = pcm_release_private; 2073 } 2074 file->private_data = pcm_file; 2075 if (rpcm_file) 2076 *rpcm_file = pcm_file; 2077 return 0; 2078 } 2079 2080 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2081 { 2082 struct snd_pcm *pcm; 2083 int err = nonseekable_open(inode, file); 2084 if (err < 0) 2085 return err; 2086 pcm = snd_lookup_minor_data(iminor(inode), 2087 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2088 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2089 } 2090 2091 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2092 { 2093 struct snd_pcm *pcm; 2094 int err = nonseekable_open(inode, file); 2095 if (err < 0) 2096 return err; 2097 pcm = snd_lookup_minor_data(iminor(inode), 2098 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2099 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2100 } 2101 2102 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2103 { 2104 int err; 2105 struct snd_pcm_file *pcm_file; 2106 wait_queue_t wait; 2107 2108 if (pcm == NULL) { 2109 err = -ENODEV; 2110 goto __error1; 2111 } 2112 err = snd_card_file_add(pcm->card, file); 2113 if (err < 0) 2114 goto __error1; 2115 if (!try_module_get(pcm->card->module)) { 2116 err = -EFAULT; 2117 goto __error2; 2118 } 2119 init_waitqueue_entry(&wait, current); 2120 add_wait_queue(&pcm->open_wait, &wait); 2121 mutex_lock(&pcm->open_mutex); 2122 while (1) { 2123 err = snd_pcm_open_file(file, pcm, stream, &pcm_file); 2124 if (err >= 0) 2125 break; 2126 if (err == -EAGAIN) { 2127 if (file->f_flags & O_NONBLOCK) { 2128 err = -EBUSY; 2129 break; 2130 } 2131 } else 2132 break; 2133 set_current_state(TASK_INTERRUPTIBLE); 2134 mutex_unlock(&pcm->open_mutex); 2135 schedule(); 2136 mutex_lock(&pcm->open_mutex); 2137 if (signal_pending(current)) { 2138 err = -ERESTARTSYS; 2139 break; 2140 } 2141 } 2142 remove_wait_queue(&pcm->open_wait, &wait); 2143 mutex_unlock(&pcm->open_mutex); 2144 if (err < 0) 2145 goto __error; 2146 return err; 2147 2148 __error: 2149 module_put(pcm->card->module); 2150 __error2: 2151 snd_card_file_remove(pcm->card, file); 2152 __error1: 2153 return err; 2154 } 2155 2156 static int snd_pcm_release(struct inode *inode, struct file *file) 2157 { 2158 struct snd_pcm *pcm; 2159 struct snd_pcm_substream *substream; 2160 struct snd_pcm_file *pcm_file; 2161 2162 pcm_file = file->private_data; 2163 substream = pcm_file->substream; 2164 if (snd_BUG_ON(!substream)) 2165 return -ENXIO; 2166 pcm = substream->pcm; 2167 mutex_lock(&pcm->open_mutex); 2168 snd_pcm_release_substream(substream); 2169 kfree(pcm_file); 2170 mutex_unlock(&pcm->open_mutex); 2171 wake_up(&pcm->open_wait); 2172 module_put(pcm->card->module); 2173 snd_card_file_remove(pcm->card, file); 2174 return 0; 2175 } 2176 2177 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2178 snd_pcm_uframes_t frames) 2179 { 2180 struct snd_pcm_runtime *runtime = substream->runtime; 2181 snd_pcm_sframes_t appl_ptr; 2182 snd_pcm_sframes_t ret; 2183 snd_pcm_sframes_t hw_avail; 2184 2185 if (frames == 0) 2186 return 0; 2187 2188 snd_pcm_stream_lock_irq(substream); 2189 switch (runtime->status->state) { 2190 case SNDRV_PCM_STATE_PREPARED: 2191 break; 2192 case SNDRV_PCM_STATE_DRAINING: 2193 case SNDRV_PCM_STATE_RUNNING: 2194 if (snd_pcm_update_hw_ptr(substream) >= 0) 2195 break; 2196 /* Fall through */ 2197 case SNDRV_PCM_STATE_XRUN: 2198 ret = -EPIPE; 2199 goto __end; 2200 case SNDRV_PCM_STATE_SUSPENDED: 2201 ret = -ESTRPIPE; 2202 goto __end; 2203 default: 2204 ret = -EBADFD; 2205 goto __end; 2206 } 2207 2208 hw_avail = snd_pcm_playback_hw_avail(runtime); 2209 if (hw_avail <= 0) { 2210 ret = 0; 2211 goto __end; 2212 } 2213 if (frames > (snd_pcm_uframes_t)hw_avail) 2214 frames = hw_avail; 2215 appl_ptr = runtime->control->appl_ptr - frames; 2216 if (appl_ptr < 0) 2217 appl_ptr += runtime->boundary; 2218 runtime->control->appl_ptr = appl_ptr; 2219 ret = frames; 2220 __end: 2221 snd_pcm_stream_unlock_irq(substream); 2222 return ret; 2223 } 2224 2225 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2226 snd_pcm_uframes_t frames) 2227 { 2228 struct snd_pcm_runtime *runtime = substream->runtime; 2229 snd_pcm_sframes_t appl_ptr; 2230 snd_pcm_sframes_t ret; 2231 snd_pcm_sframes_t hw_avail; 2232 2233 if (frames == 0) 2234 return 0; 2235 2236 snd_pcm_stream_lock_irq(substream); 2237 switch (runtime->status->state) { 2238 case SNDRV_PCM_STATE_PREPARED: 2239 case SNDRV_PCM_STATE_DRAINING: 2240 break; 2241 case SNDRV_PCM_STATE_RUNNING: 2242 if (snd_pcm_update_hw_ptr(substream) >= 0) 2243 break; 2244 /* Fall through */ 2245 case SNDRV_PCM_STATE_XRUN: 2246 ret = -EPIPE; 2247 goto __end; 2248 case SNDRV_PCM_STATE_SUSPENDED: 2249 ret = -ESTRPIPE; 2250 goto __end; 2251 default: 2252 ret = -EBADFD; 2253 goto __end; 2254 } 2255 2256 hw_avail = snd_pcm_capture_hw_avail(runtime); 2257 if (hw_avail <= 0) { 2258 ret = 0; 2259 goto __end; 2260 } 2261 if (frames > (snd_pcm_uframes_t)hw_avail) 2262 frames = hw_avail; 2263 appl_ptr = runtime->control->appl_ptr - frames; 2264 if (appl_ptr < 0) 2265 appl_ptr += runtime->boundary; 2266 runtime->control->appl_ptr = appl_ptr; 2267 ret = frames; 2268 __end: 2269 snd_pcm_stream_unlock_irq(substream); 2270 return ret; 2271 } 2272 2273 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2274 snd_pcm_uframes_t frames) 2275 { 2276 struct snd_pcm_runtime *runtime = substream->runtime; 2277 snd_pcm_sframes_t appl_ptr; 2278 snd_pcm_sframes_t ret; 2279 snd_pcm_sframes_t avail; 2280 2281 if (frames == 0) 2282 return 0; 2283 2284 snd_pcm_stream_lock_irq(substream); 2285 switch (runtime->status->state) { 2286 case SNDRV_PCM_STATE_PREPARED: 2287 case SNDRV_PCM_STATE_PAUSED: 2288 break; 2289 case SNDRV_PCM_STATE_DRAINING: 2290 case SNDRV_PCM_STATE_RUNNING: 2291 if (snd_pcm_update_hw_ptr(substream) >= 0) 2292 break; 2293 /* Fall through */ 2294 case SNDRV_PCM_STATE_XRUN: 2295 ret = -EPIPE; 2296 goto __end; 2297 case SNDRV_PCM_STATE_SUSPENDED: 2298 ret = -ESTRPIPE; 2299 goto __end; 2300 default: 2301 ret = -EBADFD; 2302 goto __end; 2303 } 2304 2305 avail = snd_pcm_playback_avail(runtime); 2306 if (avail <= 0) { 2307 ret = 0; 2308 goto __end; 2309 } 2310 if (frames > (snd_pcm_uframes_t)avail) 2311 frames = avail; 2312 appl_ptr = runtime->control->appl_ptr + frames; 2313 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2314 appl_ptr -= runtime->boundary; 2315 runtime->control->appl_ptr = appl_ptr; 2316 ret = frames; 2317 __end: 2318 snd_pcm_stream_unlock_irq(substream); 2319 return ret; 2320 } 2321 2322 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2323 snd_pcm_uframes_t frames) 2324 { 2325 struct snd_pcm_runtime *runtime = substream->runtime; 2326 snd_pcm_sframes_t appl_ptr; 2327 snd_pcm_sframes_t ret; 2328 snd_pcm_sframes_t avail; 2329 2330 if (frames == 0) 2331 return 0; 2332 2333 snd_pcm_stream_lock_irq(substream); 2334 switch (runtime->status->state) { 2335 case SNDRV_PCM_STATE_PREPARED: 2336 case SNDRV_PCM_STATE_DRAINING: 2337 case SNDRV_PCM_STATE_PAUSED: 2338 break; 2339 case SNDRV_PCM_STATE_RUNNING: 2340 if (snd_pcm_update_hw_ptr(substream) >= 0) 2341 break; 2342 /* Fall through */ 2343 case SNDRV_PCM_STATE_XRUN: 2344 ret = -EPIPE; 2345 goto __end; 2346 case SNDRV_PCM_STATE_SUSPENDED: 2347 ret = -ESTRPIPE; 2348 goto __end; 2349 default: 2350 ret = -EBADFD; 2351 goto __end; 2352 } 2353 2354 avail = snd_pcm_capture_avail(runtime); 2355 if (avail <= 0) { 2356 ret = 0; 2357 goto __end; 2358 } 2359 if (frames > (snd_pcm_uframes_t)avail) 2360 frames = avail; 2361 appl_ptr = runtime->control->appl_ptr + frames; 2362 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2363 appl_ptr -= runtime->boundary; 2364 runtime->control->appl_ptr = appl_ptr; 2365 ret = frames; 2366 __end: 2367 snd_pcm_stream_unlock_irq(substream); 2368 return ret; 2369 } 2370 2371 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2372 { 2373 struct snd_pcm_runtime *runtime = substream->runtime; 2374 int err; 2375 2376 snd_pcm_stream_lock_irq(substream); 2377 switch (runtime->status->state) { 2378 case SNDRV_PCM_STATE_DRAINING: 2379 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2380 goto __badfd; 2381 case SNDRV_PCM_STATE_RUNNING: 2382 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2383 break; 2384 /* Fall through */ 2385 case SNDRV_PCM_STATE_PREPARED: 2386 case SNDRV_PCM_STATE_SUSPENDED: 2387 err = 0; 2388 break; 2389 case SNDRV_PCM_STATE_XRUN: 2390 err = -EPIPE; 2391 break; 2392 default: 2393 __badfd: 2394 err = -EBADFD; 2395 break; 2396 } 2397 snd_pcm_stream_unlock_irq(substream); 2398 return err; 2399 } 2400 2401 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2402 snd_pcm_sframes_t __user *res) 2403 { 2404 struct snd_pcm_runtime *runtime = substream->runtime; 2405 int err; 2406 snd_pcm_sframes_t n = 0; 2407 2408 snd_pcm_stream_lock_irq(substream); 2409 switch (runtime->status->state) { 2410 case SNDRV_PCM_STATE_DRAINING: 2411 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2412 goto __badfd; 2413 case SNDRV_PCM_STATE_RUNNING: 2414 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2415 break; 2416 /* Fall through */ 2417 case SNDRV_PCM_STATE_PREPARED: 2418 case SNDRV_PCM_STATE_SUSPENDED: 2419 err = 0; 2420 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2421 n = snd_pcm_playback_hw_avail(runtime); 2422 else 2423 n = snd_pcm_capture_avail(runtime); 2424 n += runtime->delay; 2425 break; 2426 case SNDRV_PCM_STATE_XRUN: 2427 err = -EPIPE; 2428 break; 2429 default: 2430 __badfd: 2431 err = -EBADFD; 2432 break; 2433 } 2434 snd_pcm_stream_unlock_irq(substream); 2435 if (!err) 2436 if (put_user(n, res)) 2437 err = -EFAULT; 2438 return err; 2439 } 2440 2441 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2442 struct snd_pcm_sync_ptr __user *_sync_ptr) 2443 { 2444 struct snd_pcm_runtime *runtime = substream->runtime; 2445 struct snd_pcm_sync_ptr sync_ptr; 2446 volatile struct snd_pcm_mmap_status *status; 2447 volatile struct snd_pcm_mmap_control *control; 2448 int err; 2449 2450 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2451 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2452 return -EFAULT; 2453 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2454 return -EFAULT; 2455 status = runtime->status; 2456 control = runtime->control; 2457 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2458 err = snd_pcm_hwsync(substream); 2459 if (err < 0) 2460 return err; 2461 } 2462 snd_pcm_stream_lock_irq(substream); 2463 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2464 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2465 else 2466 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2467 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2468 control->avail_min = sync_ptr.c.control.avail_min; 2469 else 2470 sync_ptr.c.control.avail_min = control->avail_min; 2471 sync_ptr.s.status.state = status->state; 2472 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2473 sync_ptr.s.status.tstamp = status->tstamp; 2474 sync_ptr.s.status.suspended_state = status->suspended_state; 2475 snd_pcm_stream_unlock_irq(substream); 2476 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2477 return -EFAULT; 2478 return 0; 2479 } 2480 2481 static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg) 2482 { 2483 struct snd_pcm_runtime *runtime = substream->runtime; 2484 int arg; 2485 2486 if (get_user(arg, _arg)) 2487 return -EFAULT; 2488 if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST) 2489 return -EINVAL; 2490 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY; 2491 if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC) 2492 runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC; 2493 return 0; 2494 } 2495 2496 static int snd_pcm_common_ioctl1(struct file *file, 2497 struct snd_pcm_substream *substream, 2498 unsigned int cmd, void __user *arg) 2499 { 2500 switch (cmd) { 2501 case SNDRV_PCM_IOCTL_PVERSION: 2502 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2503 case SNDRV_PCM_IOCTL_INFO: 2504 return snd_pcm_info_user(substream, arg); 2505 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2506 return 0; 2507 case SNDRV_PCM_IOCTL_TTSTAMP: 2508 return snd_pcm_tstamp(substream, arg); 2509 case SNDRV_PCM_IOCTL_HW_REFINE: 2510 return snd_pcm_hw_refine_user(substream, arg); 2511 case SNDRV_PCM_IOCTL_HW_PARAMS: 2512 return snd_pcm_hw_params_user(substream, arg); 2513 case SNDRV_PCM_IOCTL_HW_FREE: 2514 return snd_pcm_hw_free(substream); 2515 case SNDRV_PCM_IOCTL_SW_PARAMS: 2516 return snd_pcm_sw_params_user(substream, arg); 2517 case SNDRV_PCM_IOCTL_STATUS: 2518 return snd_pcm_status_user(substream, arg); 2519 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2520 return snd_pcm_channel_info_user(substream, arg); 2521 case SNDRV_PCM_IOCTL_PREPARE: 2522 return snd_pcm_prepare(substream, file); 2523 case SNDRV_PCM_IOCTL_RESET: 2524 return snd_pcm_reset(substream); 2525 case SNDRV_PCM_IOCTL_START: 2526 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2527 case SNDRV_PCM_IOCTL_LINK: 2528 return snd_pcm_link(substream, (int)(unsigned long) arg); 2529 case SNDRV_PCM_IOCTL_UNLINK: 2530 return snd_pcm_unlink(substream); 2531 case SNDRV_PCM_IOCTL_RESUME: 2532 return snd_pcm_resume(substream); 2533 case SNDRV_PCM_IOCTL_XRUN: 2534 return snd_pcm_xrun(substream); 2535 case SNDRV_PCM_IOCTL_HWSYNC: 2536 return snd_pcm_hwsync(substream); 2537 case SNDRV_PCM_IOCTL_DELAY: 2538 return snd_pcm_delay(substream, arg); 2539 case SNDRV_PCM_IOCTL_SYNC_PTR: 2540 return snd_pcm_sync_ptr(substream, arg); 2541 #ifdef CONFIG_SND_SUPPORT_OLD_API 2542 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2543 return snd_pcm_hw_refine_old_user(substream, arg); 2544 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2545 return snd_pcm_hw_params_old_user(substream, arg); 2546 #endif 2547 case SNDRV_PCM_IOCTL_DRAIN: 2548 return snd_pcm_drain(substream, file); 2549 case SNDRV_PCM_IOCTL_DROP: 2550 return snd_pcm_drop(substream); 2551 case SNDRV_PCM_IOCTL_PAUSE: 2552 { 2553 int res; 2554 snd_pcm_stream_lock_irq(substream); 2555 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2556 snd_pcm_stream_unlock_irq(substream); 2557 return res; 2558 } 2559 } 2560 snd_printd("unknown ioctl = 0x%x\n", cmd); 2561 return -ENOTTY; 2562 } 2563 2564 static int snd_pcm_playback_ioctl1(struct file *file, 2565 struct snd_pcm_substream *substream, 2566 unsigned int cmd, void __user *arg) 2567 { 2568 if (snd_BUG_ON(!substream)) 2569 return -ENXIO; 2570 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 2571 return -EINVAL; 2572 switch (cmd) { 2573 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2574 { 2575 struct snd_xferi xferi; 2576 struct snd_xferi __user *_xferi = arg; 2577 struct snd_pcm_runtime *runtime = substream->runtime; 2578 snd_pcm_sframes_t result; 2579 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2580 return -EBADFD; 2581 if (put_user(0, &_xferi->result)) 2582 return -EFAULT; 2583 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2584 return -EFAULT; 2585 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2586 __put_user(result, &_xferi->result); 2587 return result < 0 ? result : 0; 2588 } 2589 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2590 { 2591 struct snd_xfern xfern; 2592 struct snd_xfern __user *_xfern = arg; 2593 struct snd_pcm_runtime *runtime = substream->runtime; 2594 void __user **bufs; 2595 snd_pcm_sframes_t result; 2596 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2597 return -EBADFD; 2598 if (runtime->channels > 128) 2599 return -EINVAL; 2600 if (put_user(0, &_xfern->result)) 2601 return -EFAULT; 2602 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2603 return -EFAULT; 2604 2605 bufs = memdup_user(xfern.bufs, 2606 sizeof(void *) * runtime->channels); 2607 if (IS_ERR(bufs)) 2608 return PTR_ERR(bufs); 2609 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2610 kfree(bufs); 2611 __put_user(result, &_xfern->result); 2612 return result < 0 ? result : 0; 2613 } 2614 case SNDRV_PCM_IOCTL_REWIND: 2615 { 2616 snd_pcm_uframes_t frames; 2617 snd_pcm_uframes_t __user *_frames = arg; 2618 snd_pcm_sframes_t result; 2619 if (get_user(frames, _frames)) 2620 return -EFAULT; 2621 if (put_user(0, _frames)) 2622 return -EFAULT; 2623 result = snd_pcm_playback_rewind(substream, frames); 2624 __put_user(result, _frames); 2625 return result < 0 ? result : 0; 2626 } 2627 case SNDRV_PCM_IOCTL_FORWARD: 2628 { 2629 snd_pcm_uframes_t frames; 2630 snd_pcm_uframes_t __user *_frames = arg; 2631 snd_pcm_sframes_t result; 2632 if (get_user(frames, _frames)) 2633 return -EFAULT; 2634 if (put_user(0, _frames)) 2635 return -EFAULT; 2636 result = snd_pcm_playback_forward(substream, frames); 2637 __put_user(result, _frames); 2638 return result < 0 ? result : 0; 2639 } 2640 } 2641 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2642 } 2643 2644 static int snd_pcm_capture_ioctl1(struct file *file, 2645 struct snd_pcm_substream *substream, 2646 unsigned int cmd, void __user *arg) 2647 { 2648 if (snd_BUG_ON(!substream)) 2649 return -ENXIO; 2650 if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE)) 2651 return -EINVAL; 2652 switch (cmd) { 2653 case SNDRV_PCM_IOCTL_READI_FRAMES: 2654 { 2655 struct snd_xferi xferi; 2656 struct snd_xferi __user *_xferi = arg; 2657 struct snd_pcm_runtime *runtime = substream->runtime; 2658 snd_pcm_sframes_t result; 2659 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2660 return -EBADFD; 2661 if (put_user(0, &_xferi->result)) 2662 return -EFAULT; 2663 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2664 return -EFAULT; 2665 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2666 __put_user(result, &_xferi->result); 2667 return result < 0 ? result : 0; 2668 } 2669 case SNDRV_PCM_IOCTL_READN_FRAMES: 2670 { 2671 struct snd_xfern xfern; 2672 struct snd_xfern __user *_xfern = arg; 2673 struct snd_pcm_runtime *runtime = substream->runtime; 2674 void *bufs; 2675 snd_pcm_sframes_t result; 2676 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2677 return -EBADFD; 2678 if (runtime->channels > 128) 2679 return -EINVAL; 2680 if (put_user(0, &_xfern->result)) 2681 return -EFAULT; 2682 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2683 return -EFAULT; 2684 2685 bufs = memdup_user(xfern.bufs, 2686 sizeof(void *) * runtime->channels); 2687 if (IS_ERR(bufs)) 2688 return PTR_ERR(bufs); 2689 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2690 kfree(bufs); 2691 __put_user(result, &_xfern->result); 2692 return result < 0 ? result : 0; 2693 } 2694 case SNDRV_PCM_IOCTL_REWIND: 2695 { 2696 snd_pcm_uframes_t frames; 2697 snd_pcm_uframes_t __user *_frames = arg; 2698 snd_pcm_sframes_t result; 2699 if (get_user(frames, _frames)) 2700 return -EFAULT; 2701 if (put_user(0, _frames)) 2702 return -EFAULT; 2703 result = snd_pcm_capture_rewind(substream, frames); 2704 __put_user(result, _frames); 2705 return result < 0 ? result : 0; 2706 } 2707 case SNDRV_PCM_IOCTL_FORWARD: 2708 { 2709 snd_pcm_uframes_t frames; 2710 snd_pcm_uframes_t __user *_frames = arg; 2711 snd_pcm_sframes_t result; 2712 if (get_user(frames, _frames)) 2713 return -EFAULT; 2714 if (put_user(0, _frames)) 2715 return -EFAULT; 2716 result = snd_pcm_capture_forward(substream, frames); 2717 __put_user(result, _frames); 2718 return result < 0 ? result : 0; 2719 } 2720 } 2721 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2722 } 2723 2724 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2725 unsigned long arg) 2726 { 2727 struct snd_pcm_file *pcm_file; 2728 2729 pcm_file = file->private_data; 2730 2731 if (((cmd >> 8) & 0xff) != 'A') 2732 return -ENOTTY; 2733 2734 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2735 (void __user *)arg); 2736 } 2737 2738 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2739 unsigned long arg) 2740 { 2741 struct snd_pcm_file *pcm_file; 2742 2743 pcm_file = file->private_data; 2744 2745 if (((cmd >> 8) & 0xff) != 'A') 2746 return -ENOTTY; 2747 2748 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2749 (void __user *)arg); 2750 } 2751 2752 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2753 unsigned int cmd, void *arg) 2754 { 2755 mm_segment_t fs; 2756 int result; 2757 2758 fs = snd_enter_user(); 2759 switch (substream->stream) { 2760 case SNDRV_PCM_STREAM_PLAYBACK: 2761 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2762 (void __user *)arg); 2763 break; 2764 case SNDRV_PCM_STREAM_CAPTURE: 2765 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2766 (void __user *)arg); 2767 break; 2768 default: 2769 result = -EINVAL; 2770 break; 2771 } 2772 snd_leave_user(fs); 2773 return result; 2774 } 2775 2776 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2777 2778 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2779 loff_t * offset) 2780 { 2781 struct snd_pcm_file *pcm_file; 2782 struct snd_pcm_substream *substream; 2783 struct snd_pcm_runtime *runtime; 2784 snd_pcm_sframes_t result; 2785 2786 pcm_file = file->private_data; 2787 substream = pcm_file->substream; 2788 if (PCM_RUNTIME_CHECK(substream)) 2789 return -ENXIO; 2790 runtime = substream->runtime; 2791 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2792 return -EBADFD; 2793 if (!frame_aligned(runtime, count)) 2794 return -EINVAL; 2795 count = bytes_to_frames(runtime, count); 2796 result = snd_pcm_lib_read(substream, buf, count); 2797 if (result > 0) 2798 result = frames_to_bytes(runtime, result); 2799 return result; 2800 } 2801 2802 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2803 size_t count, loff_t * offset) 2804 { 2805 struct snd_pcm_file *pcm_file; 2806 struct snd_pcm_substream *substream; 2807 struct snd_pcm_runtime *runtime; 2808 snd_pcm_sframes_t result; 2809 2810 pcm_file = file->private_data; 2811 substream = pcm_file->substream; 2812 if (PCM_RUNTIME_CHECK(substream)) 2813 return -ENXIO; 2814 runtime = substream->runtime; 2815 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2816 return -EBADFD; 2817 if (!frame_aligned(runtime, count)) 2818 return -EINVAL; 2819 count = bytes_to_frames(runtime, count); 2820 result = snd_pcm_lib_write(substream, buf, count); 2821 if (result > 0) 2822 result = frames_to_bytes(runtime, result); 2823 return result; 2824 } 2825 2826 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 2827 unsigned long nr_segs, loff_t pos) 2828 2829 { 2830 struct snd_pcm_file *pcm_file; 2831 struct snd_pcm_substream *substream; 2832 struct snd_pcm_runtime *runtime; 2833 snd_pcm_sframes_t result; 2834 unsigned long i; 2835 void __user **bufs; 2836 snd_pcm_uframes_t frames; 2837 2838 pcm_file = iocb->ki_filp->private_data; 2839 substream = pcm_file->substream; 2840 if (PCM_RUNTIME_CHECK(substream)) 2841 return -ENXIO; 2842 runtime = substream->runtime; 2843 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2844 return -EBADFD; 2845 if (nr_segs > 1024 || nr_segs != runtime->channels) 2846 return -EINVAL; 2847 if (!frame_aligned(runtime, iov->iov_len)) 2848 return -EINVAL; 2849 frames = bytes_to_samples(runtime, iov->iov_len); 2850 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2851 if (bufs == NULL) 2852 return -ENOMEM; 2853 for (i = 0; i < nr_segs; ++i) 2854 bufs[i] = iov[i].iov_base; 2855 result = snd_pcm_lib_readv(substream, bufs, frames); 2856 if (result > 0) 2857 result = frames_to_bytes(runtime, result); 2858 kfree(bufs); 2859 return result; 2860 } 2861 2862 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 2863 unsigned long nr_segs, loff_t pos) 2864 { 2865 struct snd_pcm_file *pcm_file; 2866 struct snd_pcm_substream *substream; 2867 struct snd_pcm_runtime *runtime; 2868 snd_pcm_sframes_t result; 2869 unsigned long i; 2870 void __user **bufs; 2871 snd_pcm_uframes_t frames; 2872 2873 pcm_file = iocb->ki_filp->private_data; 2874 substream = pcm_file->substream; 2875 if (PCM_RUNTIME_CHECK(substream)) 2876 return -ENXIO; 2877 runtime = substream->runtime; 2878 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2879 return -EBADFD; 2880 if (nr_segs > 128 || nr_segs != runtime->channels || 2881 !frame_aligned(runtime, iov->iov_len)) 2882 return -EINVAL; 2883 frames = bytes_to_samples(runtime, iov->iov_len); 2884 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2885 if (bufs == NULL) 2886 return -ENOMEM; 2887 for (i = 0; i < nr_segs; ++i) 2888 bufs[i] = iov[i].iov_base; 2889 result = snd_pcm_lib_writev(substream, bufs, frames); 2890 if (result > 0) 2891 result = frames_to_bytes(runtime, result); 2892 kfree(bufs); 2893 return result; 2894 } 2895 2896 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 2897 { 2898 struct snd_pcm_file *pcm_file; 2899 struct snd_pcm_substream *substream; 2900 struct snd_pcm_runtime *runtime; 2901 unsigned int mask; 2902 snd_pcm_uframes_t avail; 2903 2904 pcm_file = file->private_data; 2905 2906 substream = pcm_file->substream; 2907 if (PCM_RUNTIME_CHECK(substream)) 2908 return -ENXIO; 2909 runtime = substream->runtime; 2910 2911 poll_wait(file, &runtime->sleep, wait); 2912 2913 snd_pcm_stream_lock_irq(substream); 2914 avail = snd_pcm_playback_avail(runtime); 2915 switch (runtime->status->state) { 2916 case SNDRV_PCM_STATE_RUNNING: 2917 case SNDRV_PCM_STATE_PREPARED: 2918 case SNDRV_PCM_STATE_PAUSED: 2919 if (avail >= runtime->control->avail_min) { 2920 mask = POLLOUT | POLLWRNORM; 2921 break; 2922 } 2923 /* Fall through */ 2924 case SNDRV_PCM_STATE_DRAINING: 2925 mask = 0; 2926 break; 2927 default: 2928 mask = POLLOUT | POLLWRNORM | POLLERR; 2929 break; 2930 } 2931 snd_pcm_stream_unlock_irq(substream); 2932 return mask; 2933 } 2934 2935 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 2936 { 2937 struct snd_pcm_file *pcm_file; 2938 struct snd_pcm_substream *substream; 2939 struct snd_pcm_runtime *runtime; 2940 unsigned int mask; 2941 snd_pcm_uframes_t avail; 2942 2943 pcm_file = file->private_data; 2944 2945 substream = pcm_file->substream; 2946 if (PCM_RUNTIME_CHECK(substream)) 2947 return -ENXIO; 2948 runtime = substream->runtime; 2949 2950 poll_wait(file, &runtime->sleep, wait); 2951 2952 snd_pcm_stream_lock_irq(substream); 2953 avail = snd_pcm_capture_avail(runtime); 2954 switch (runtime->status->state) { 2955 case SNDRV_PCM_STATE_RUNNING: 2956 case SNDRV_PCM_STATE_PREPARED: 2957 case SNDRV_PCM_STATE_PAUSED: 2958 if (avail >= runtime->control->avail_min) { 2959 mask = POLLIN | POLLRDNORM; 2960 break; 2961 } 2962 mask = 0; 2963 break; 2964 case SNDRV_PCM_STATE_DRAINING: 2965 if (avail > 0) { 2966 mask = POLLIN | POLLRDNORM; 2967 break; 2968 } 2969 /* Fall through */ 2970 default: 2971 mask = POLLIN | POLLRDNORM | POLLERR; 2972 break; 2973 } 2974 snd_pcm_stream_unlock_irq(substream); 2975 return mask; 2976 } 2977 2978 /* 2979 * mmap support 2980 */ 2981 2982 /* 2983 * Only on coherent architectures, we can mmap the status and the control records 2984 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 2985 */ 2986 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 2987 /* 2988 * mmap status record 2989 */ 2990 static int snd_pcm_mmap_status_fault(struct vm_area_struct *area, 2991 struct vm_fault *vmf) 2992 { 2993 struct snd_pcm_substream *substream = area->vm_private_data; 2994 struct snd_pcm_runtime *runtime; 2995 2996 if (substream == NULL) 2997 return VM_FAULT_SIGBUS; 2998 runtime = substream->runtime; 2999 vmf->page = virt_to_page(runtime->status); 3000 get_page(vmf->page); 3001 return 0; 3002 } 3003 3004 static const struct vm_operations_struct snd_pcm_vm_ops_status = 3005 { 3006 .fault = snd_pcm_mmap_status_fault, 3007 }; 3008 3009 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3010 struct vm_area_struct *area) 3011 { 3012 struct snd_pcm_runtime *runtime; 3013 long size; 3014 if (!(area->vm_flags & VM_READ)) 3015 return -EINVAL; 3016 runtime = substream->runtime; 3017 size = area->vm_end - area->vm_start; 3018 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3019 return -EINVAL; 3020 area->vm_ops = &snd_pcm_vm_ops_status; 3021 area->vm_private_data = substream; 3022 area->vm_flags |= VM_RESERVED; 3023 return 0; 3024 } 3025 3026 /* 3027 * mmap control record 3028 */ 3029 static int snd_pcm_mmap_control_fault(struct vm_area_struct *area, 3030 struct vm_fault *vmf) 3031 { 3032 struct snd_pcm_substream *substream = area->vm_private_data; 3033 struct snd_pcm_runtime *runtime; 3034 3035 if (substream == NULL) 3036 return VM_FAULT_SIGBUS; 3037 runtime = substream->runtime; 3038 vmf->page = virt_to_page(runtime->control); 3039 get_page(vmf->page); 3040 return 0; 3041 } 3042 3043 static const struct vm_operations_struct snd_pcm_vm_ops_control = 3044 { 3045 .fault = snd_pcm_mmap_control_fault, 3046 }; 3047 3048 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3049 struct vm_area_struct *area) 3050 { 3051 struct snd_pcm_runtime *runtime; 3052 long size; 3053 if (!(area->vm_flags & VM_READ)) 3054 return -EINVAL; 3055 runtime = substream->runtime; 3056 size = area->vm_end - area->vm_start; 3057 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3058 return -EINVAL; 3059 area->vm_ops = &snd_pcm_vm_ops_control; 3060 area->vm_private_data = substream; 3061 area->vm_flags |= VM_RESERVED; 3062 return 0; 3063 } 3064 #else /* ! coherent mmap */ 3065 /* 3066 * don't support mmap for status and control records. 3067 */ 3068 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3069 struct vm_area_struct *area) 3070 { 3071 return -ENXIO; 3072 } 3073 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3074 struct vm_area_struct *area) 3075 { 3076 return -ENXIO; 3077 } 3078 #endif /* coherent mmap */ 3079 3080 static inline struct page * 3081 snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs) 3082 { 3083 void *vaddr = substream->runtime->dma_area + ofs; 3084 #if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3085 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3086 return virt_to_page(CAC_ADDR(vaddr)); 3087 #endif 3088 #if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE) 3089 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) { 3090 dma_addr_t addr = substream->runtime->dma_addr + ofs; 3091 addr -= get_dma_offset(substream->dma_buffer.dev.dev); 3092 /* assume dma_handle set via pfn_to_phys() in 3093 * mm/dma-noncoherent.c 3094 */ 3095 return pfn_to_page(addr >> PAGE_SHIFT); 3096 } 3097 #endif 3098 return virt_to_page(vaddr); 3099 } 3100 3101 /* 3102 * fault callback for mmapping a RAM page 3103 */ 3104 static int snd_pcm_mmap_data_fault(struct vm_area_struct *area, 3105 struct vm_fault *vmf) 3106 { 3107 struct snd_pcm_substream *substream = area->vm_private_data; 3108 struct snd_pcm_runtime *runtime; 3109 unsigned long offset; 3110 struct page * page; 3111 size_t dma_bytes; 3112 3113 if (substream == NULL) 3114 return VM_FAULT_SIGBUS; 3115 runtime = substream->runtime; 3116 offset = vmf->pgoff << PAGE_SHIFT; 3117 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3118 if (offset > dma_bytes - PAGE_SIZE) 3119 return VM_FAULT_SIGBUS; 3120 if (substream->ops->page) 3121 page = substream->ops->page(substream, offset); 3122 else 3123 page = snd_pcm_default_page_ops(substream, offset); 3124 if (!page) 3125 return VM_FAULT_SIGBUS; 3126 get_page(page); 3127 vmf->page = page; 3128 return 0; 3129 } 3130 3131 static const struct vm_operations_struct snd_pcm_vm_ops_data = { 3132 .open = snd_pcm_mmap_data_open, 3133 .close = snd_pcm_mmap_data_close, 3134 }; 3135 3136 static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 3137 .open = snd_pcm_mmap_data_open, 3138 .close = snd_pcm_mmap_data_close, 3139 .fault = snd_pcm_mmap_data_fault, 3140 }; 3141 3142 #ifndef ARCH_HAS_DMA_MMAP_COHERENT 3143 /* This should be defined / handled globally! */ 3144 #ifdef CONFIG_ARM 3145 #define ARCH_HAS_DMA_MMAP_COHERENT 3146 #endif 3147 #endif 3148 3149 /* 3150 * mmap the DMA buffer on RAM 3151 */ 3152 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream, 3153 struct vm_area_struct *area) 3154 { 3155 area->vm_flags |= VM_RESERVED; 3156 #ifdef ARCH_HAS_DMA_MMAP_COHERENT 3157 if (!substream->ops->page && 3158 substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) 3159 return dma_mmap_coherent(substream->dma_buffer.dev.dev, 3160 area, 3161 substream->runtime->dma_area, 3162 substream->runtime->dma_addr, 3163 area->vm_end - area->vm_start); 3164 #elif defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT) 3165 if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV && 3166 !plat_device_is_coherent(substream->dma_buffer.dev.dev)) 3167 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3168 #endif /* ARCH_HAS_DMA_MMAP_COHERENT */ 3169 /* mmap with fault handler */ 3170 area->vm_ops = &snd_pcm_vm_ops_data_fault; 3171 return 0; 3172 } 3173 3174 /* 3175 * mmap the DMA buffer on I/O memory area 3176 */ 3177 #if SNDRV_PCM_INFO_MMAP_IOMEM 3178 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3179 struct vm_area_struct *area) 3180 { 3181 long size; 3182 unsigned long offset; 3183 3184 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3185 area->vm_flags |= VM_IO; 3186 size = area->vm_end - area->vm_start; 3187 offset = area->vm_pgoff << PAGE_SHIFT; 3188 if (io_remap_pfn_range(area, area->vm_start, 3189 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT, 3190 size, area->vm_page_prot)) 3191 return -EAGAIN; 3192 return 0; 3193 } 3194 3195 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3196 #endif /* SNDRV_PCM_INFO_MMAP */ 3197 3198 /* mmap callback with pgprot_noncached */ 3199 int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream, 3200 struct vm_area_struct *area) 3201 { 3202 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3203 return snd_pcm_default_mmap(substream, area); 3204 } 3205 EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached); 3206 3207 /* 3208 * mmap DMA buffer 3209 */ 3210 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3211 struct vm_area_struct *area) 3212 { 3213 struct snd_pcm_runtime *runtime; 3214 long size; 3215 unsigned long offset; 3216 size_t dma_bytes; 3217 int err; 3218 3219 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3220 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3221 return -EINVAL; 3222 } else { 3223 if (!(area->vm_flags & VM_READ)) 3224 return -EINVAL; 3225 } 3226 runtime = substream->runtime; 3227 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3228 return -EBADFD; 3229 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3230 return -ENXIO; 3231 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3232 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3233 return -EINVAL; 3234 size = area->vm_end - area->vm_start; 3235 offset = area->vm_pgoff << PAGE_SHIFT; 3236 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3237 if ((size_t)size > dma_bytes) 3238 return -EINVAL; 3239 if (offset > dma_bytes - size) 3240 return -EINVAL; 3241 3242 area->vm_ops = &snd_pcm_vm_ops_data; 3243 area->vm_private_data = substream; 3244 if (substream->ops->mmap) 3245 err = substream->ops->mmap(substream, area); 3246 else 3247 err = snd_pcm_default_mmap(substream, area); 3248 if (!err) 3249 atomic_inc(&substream->mmap_count); 3250 return err; 3251 } 3252 3253 EXPORT_SYMBOL(snd_pcm_mmap_data); 3254 3255 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3256 { 3257 struct snd_pcm_file * pcm_file; 3258 struct snd_pcm_substream *substream; 3259 unsigned long offset; 3260 3261 pcm_file = file->private_data; 3262 substream = pcm_file->substream; 3263 if (PCM_RUNTIME_CHECK(substream)) 3264 return -ENXIO; 3265 3266 offset = area->vm_pgoff << PAGE_SHIFT; 3267 switch (offset) { 3268 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3269 if (pcm_file->no_compat_mmap) 3270 return -ENXIO; 3271 return snd_pcm_mmap_status(substream, file, area); 3272 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3273 if (pcm_file->no_compat_mmap) 3274 return -ENXIO; 3275 return snd_pcm_mmap_control(substream, file, area); 3276 default: 3277 return snd_pcm_mmap_data(substream, file, area); 3278 } 3279 return 0; 3280 } 3281 3282 static int snd_pcm_fasync(int fd, struct file * file, int on) 3283 { 3284 struct snd_pcm_file * pcm_file; 3285 struct snd_pcm_substream *substream; 3286 struct snd_pcm_runtime *runtime; 3287 3288 pcm_file = file->private_data; 3289 substream = pcm_file->substream; 3290 if (PCM_RUNTIME_CHECK(substream)) 3291 return -ENXIO; 3292 runtime = substream->runtime; 3293 return fasync_helper(fd, file, on, &runtime->fasync); 3294 } 3295 3296 /* 3297 * ioctl32 compat 3298 */ 3299 #ifdef CONFIG_COMPAT 3300 #include "pcm_compat.c" 3301 #else 3302 #define snd_pcm_ioctl_compat NULL 3303 #endif 3304 3305 /* 3306 * To be removed helpers to keep binary compatibility 3307 */ 3308 3309 #ifdef CONFIG_SND_SUPPORT_OLD_API 3310 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3311 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3312 3313 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3314 struct snd_pcm_hw_params_old *oparams) 3315 { 3316 unsigned int i; 3317 3318 memset(params, 0, sizeof(*params)); 3319 params->flags = oparams->flags; 3320 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3321 params->masks[i].bits[0] = oparams->masks[i]; 3322 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3323 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3324 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3325 params->info = oparams->info; 3326 params->msbits = oparams->msbits; 3327 params->rate_num = oparams->rate_num; 3328 params->rate_den = oparams->rate_den; 3329 params->fifo_size = oparams->fifo_size; 3330 } 3331 3332 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3333 struct snd_pcm_hw_params *params) 3334 { 3335 unsigned int i; 3336 3337 memset(oparams, 0, sizeof(*oparams)); 3338 oparams->flags = params->flags; 3339 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3340 oparams->masks[i] = params->masks[i].bits[0]; 3341 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3342 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3343 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3344 oparams->info = params->info; 3345 oparams->msbits = params->msbits; 3346 oparams->rate_num = params->rate_num; 3347 oparams->rate_den = params->rate_den; 3348 oparams->fifo_size = params->fifo_size; 3349 } 3350 3351 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3352 struct snd_pcm_hw_params_old __user * _oparams) 3353 { 3354 struct snd_pcm_hw_params *params; 3355 struct snd_pcm_hw_params_old *oparams = NULL; 3356 int err; 3357 3358 params = kmalloc(sizeof(*params), GFP_KERNEL); 3359 if (!params) 3360 return -ENOMEM; 3361 3362 oparams = memdup_user(_oparams, sizeof(*oparams)); 3363 if (IS_ERR(oparams)) { 3364 err = PTR_ERR(oparams); 3365 goto out; 3366 } 3367 snd_pcm_hw_convert_from_old_params(params, oparams); 3368 err = snd_pcm_hw_refine(substream, params); 3369 snd_pcm_hw_convert_to_old_params(oparams, params); 3370 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3371 if (!err) 3372 err = -EFAULT; 3373 } 3374 3375 kfree(oparams); 3376 out: 3377 kfree(params); 3378 return err; 3379 } 3380 3381 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 3382 struct snd_pcm_hw_params_old __user * _oparams) 3383 { 3384 struct snd_pcm_hw_params *params; 3385 struct snd_pcm_hw_params_old *oparams = NULL; 3386 int err; 3387 3388 params = kmalloc(sizeof(*params), GFP_KERNEL); 3389 if (!params) 3390 return -ENOMEM; 3391 3392 oparams = memdup_user(_oparams, sizeof(*oparams)); 3393 if (IS_ERR(oparams)) { 3394 err = PTR_ERR(oparams); 3395 goto out; 3396 } 3397 snd_pcm_hw_convert_from_old_params(params, oparams); 3398 err = snd_pcm_hw_params(substream, params); 3399 snd_pcm_hw_convert_to_old_params(oparams, params); 3400 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3401 if (!err) 3402 err = -EFAULT; 3403 } 3404 3405 kfree(oparams); 3406 out: 3407 kfree(params); 3408 return err; 3409 } 3410 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3411 3412 #ifndef CONFIG_MMU 3413 static unsigned long snd_pcm_get_unmapped_area(struct file *file, 3414 unsigned long addr, 3415 unsigned long len, 3416 unsigned long pgoff, 3417 unsigned long flags) 3418 { 3419 struct snd_pcm_file *pcm_file = file->private_data; 3420 struct snd_pcm_substream *substream = pcm_file->substream; 3421 struct snd_pcm_runtime *runtime = substream->runtime; 3422 unsigned long offset = pgoff << PAGE_SHIFT; 3423 3424 switch (offset) { 3425 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3426 return (unsigned long)runtime->status; 3427 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3428 return (unsigned long)runtime->control; 3429 default: 3430 return (unsigned long)runtime->dma_area + offset; 3431 } 3432 } 3433 #else 3434 # define snd_pcm_get_unmapped_area NULL 3435 #endif 3436 3437 /* 3438 * Register section 3439 */ 3440 3441 const struct file_operations snd_pcm_f_ops[2] = { 3442 { 3443 .owner = THIS_MODULE, 3444 .write = snd_pcm_write, 3445 .aio_write = snd_pcm_aio_write, 3446 .open = snd_pcm_playback_open, 3447 .release = snd_pcm_release, 3448 .llseek = no_llseek, 3449 .poll = snd_pcm_playback_poll, 3450 .unlocked_ioctl = snd_pcm_playback_ioctl, 3451 .compat_ioctl = snd_pcm_ioctl_compat, 3452 .mmap = snd_pcm_mmap, 3453 .fasync = snd_pcm_fasync, 3454 .get_unmapped_area = snd_pcm_get_unmapped_area, 3455 }, 3456 { 3457 .owner = THIS_MODULE, 3458 .read = snd_pcm_read, 3459 .aio_read = snd_pcm_aio_read, 3460 .open = snd_pcm_capture_open, 3461 .release = snd_pcm_release, 3462 .llseek = no_llseek, 3463 .poll = snd_pcm_capture_poll, 3464 .unlocked_ioctl = snd_pcm_capture_ioctl, 3465 .compat_ioctl = snd_pcm_ioctl_compat, 3466 .mmap = snd_pcm_mmap, 3467 .fasync = snd_pcm_fasync, 3468 .get_unmapped_area = snd_pcm_get_unmapped_area, 3469 } 3470 }; 3471