1 /* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h> 23 #include <linux/mm.h> 24 #include <linux/file.h> 25 #include <linux/slab.h> 26 #include <linux/time.h> 27 #include <linux/latency.h> 28 #include <linux/uio.h> 29 #include <sound/core.h> 30 #include <sound/control.h> 31 #include <sound/info.h> 32 #include <sound/pcm.h> 33 #include <sound/pcm_params.h> 34 #include <sound/timer.h> 35 #include <sound/minors.h> 36 #include <asm/io.h> 37 38 /* 39 * Compatibility 40 */ 41 42 struct snd_pcm_hw_params_old { 43 unsigned int flags; 44 unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT - 45 SNDRV_PCM_HW_PARAM_ACCESS + 1]; 46 struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME - 47 SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1]; 48 unsigned int rmask; 49 unsigned int cmask; 50 unsigned int info; 51 unsigned int msbits; 52 unsigned int rate_num; 53 unsigned int rate_den; 54 snd_pcm_uframes_t fifo_size; 55 unsigned char reserved[64]; 56 }; 57 58 #ifdef CONFIG_SND_SUPPORT_OLD_API 59 #define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old) 60 #define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old) 61 62 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 63 struct snd_pcm_hw_params_old __user * _oparams); 64 static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream, 65 struct snd_pcm_hw_params_old __user * _oparams); 66 #endif 67 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream); 68 69 /* 70 * 71 */ 72 73 DEFINE_RWLOCK(snd_pcm_link_rwlock); 74 EXPORT_SYMBOL(snd_pcm_link_rwlock); 75 76 static DECLARE_RWSEM(snd_pcm_link_rwsem); 77 78 static inline mm_segment_t snd_enter_user(void) 79 { 80 mm_segment_t fs = get_fs(); 81 set_fs(get_ds()); 82 return fs; 83 } 84 85 static inline void snd_leave_user(mm_segment_t fs) 86 { 87 set_fs(fs); 88 } 89 90 91 92 int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info) 93 { 94 struct snd_pcm_runtime *runtime; 95 struct snd_pcm *pcm = substream->pcm; 96 struct snd_pcm_str *pstr = substream->pstr; 97 98 snd_assert(substream != NULL, return -ENXIO); 99 memset(info, 0, sizeof(*info)); 100 info->card = pcm->card->number; 101 info->device = pcm->device; 102 info->stream = substream->stream; 103 info->subdevice = substream->number; 104 strlcpy(info->id, pcm->id, sizeof(info->id)); 105 strlcpy(info->name, pcm->name, sizeof(info->name)); 106 info->dev_class = pcm->dev_class; 107 info->dev_subclass = pcm->dev_subclass; 108 info->subdevices_count = pstr->substream_count; 109 info->subdevices_avail = pstr->substream_count - pstr->substream_opened; 110 strlcpy(info->subname, substream->name, sizeof(info->subname)); 111 runtime = substream->runtime; 112 /* AB: FIXME!!! This is definitely nonsense */ 113 if (runtime) { 114 info->sync = runtime->sync; 115 substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info); 116 } 117 return 0; 118 } 119 120 int snd_pcm_info_user(struct snd_pcm_substream *substream, 121 struct snd_pcm_info __user * _info) 122 { 123 struct snd_pcm_info *info; 124 int err; 125 126 info = kmalloc(sizeof(*info), GFP_KERNEL); 127 if (! info) 128 return -ENOMEM; 129 err = snd_pcm_info(substream, info); 130 if (err >= 0) { 131 if (copy_to_user(_info, info, sizeof(*info))) 132 err = -EFAULT; 133 } 134 kfree(info); 135 return err; 136 } 137 138 #undef RULES_DEBUG 139 140 #ifdef RULES_DEBUG 141 #define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v 142 char *snd_pcm_hw_param_names[] = { 143 HW_PARAM(ACCESS), 144 HW_PARAM(FORMAT), 145 HW_PARAM(SUBFORMAT), 146 HW_PARAM(SAMPLE_BITS), 147 HW_PARAM(FRAME_BITS), 148 HW_PARAM(CHANNELS), 149 HW_PARAM(RATE), 150 HW_PARAM(PERIOD_TIME), 151 HW_PARAM(PERIOD_SIZE), 152 HW_PARAM(PERIOD_BYTES), 153 HW_PARAM(PERIODS), 154 HW_PARAM(BUFFER_TIME), 155 HW_PARAM(BUFFER_SIZE), 156 HW_PARAM(BUFFER_BYTES), 157 HW_PARAM(TICK_TIME), 158 }; 159 #endif 160 161 int snd_pcm_hw_refine(struct snd_pcm_substream *substream, 162 struct snd_pcm_hw_params *params) 163 { 164 unsigned int k; 165 struct snd_pcm_hardware *hw; 166 struct snd_interval *i = NULL; 167 struct snd_mask *m = NULL; 168 struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints; 169 unsigned int rstamps[constrs->rules_num]; 170 unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1]; 171 unsigned int stamp = 2; 172 int changed, again; 173 174 params->info = 0; 175 params->fifo_size = 0; 176 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS)) 177 params->msbits = 0; 178 if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) { 179 params->rate_num = 0; 180 params->rate_den = 0; 181 } 182 183 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 184 m = hw_param_mask(params, k); 185 if (snd_mask_empty(m)) 186 return -EINVAL; 187 if (!(params->rmask & (1 << k))) 188 continue; 189 #ifdef RULES_DEBUG 190 printk("%s = ", snd_pcm_hw_param_names[k]); 191 printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 192 #endif 193 changed = snd_mask_refine(m, constrs_mask(constrs, k)); 194 #ifdef RULES_DEBUG 195 printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]); 196 #endif 197 if (changed) 198 params->cmask |= 1 << k; 199 if (changed < 0) 200 return changed; 201 } 202 203 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 204 i = hw_param_interval(params, k); 205 if (snd_interval_empty(i)) 206 return -EINVAL; 207 if (!(params->rmask & (1 << k))) 208 continue; 209 #ifdef RULES_DEBUG 210 printk("%s = ", snd_pcm_hw_param_names[k]); 211 if (i->empty) 212 printk("empty"); 213 else 214 printk("%c%u %u%c", 215 i->openmin ? '(' : '[', i->min, 216 i->max, i->openmax ? ')' : ']'); 217 printk(" -> "); 218 #endif 219 changed = snd_interval_refine(i, constrs_interval(constrs, k)); 220 #ifdef RULES_DEBUG 221 if (i->empty) 222 printk("empty\n"); 223 else 224 printk("%c%u %u%c\n", 225 i->openmin ? '(' : '[', i->min, 226 i->max, i->openmax ? ')' : ']'); 227 #endif 228 if (changed) 229 params->cmask |= 1 << k; 230 if (changed < 0) 231 return changed; 232 } 233 234 for (k = 0; k < constrs->rules_num; k++) 235 rstamps[k] = 0; 236 for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 237 vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0; 238 do { 239 again = 0; 240 for (k = 0; k < constrs->rules_num; k++) { 241 struct snd_pcm_hw_rule *r = &constrs->rules[k]; 242 unsigned int d; 243 int doit = 0; 244 if (r->cond && !(r->cond & params->flags)) 245 continue; 246 for (d = 0; r->deps[d] >= 0; d++) { 247 if (vstamps[r->deps[d]] > rstamps[k]) { 248 doit = 1; 249 break; 250 } 251 } 252 if (!doit) 253 continue; 254 #ifdef RULES_DEBUG 255 printk("Rule %d [%p]: ", k, r->func); 256 if (r->var >= 0) { 257 printk("%s = ", snd_pcm_hw_param_names[r->var]); 258 if (hw_is_mask(r->var)) { 259 m = hw_param_mask(params, r->var); 260 printk("%x", *m->bits); 261 } else { 262 i = hw_param_interval(params, r->var); 263 if (i->empty) 264 printk("empty"); 265 else 266 printk("%c%u %u%c", 267 i->openmin ? '(' : '[', i->min, 268 i->max, i->openmax ? ')' : ']'); 269 } 270 } 271 #endif 272 changed = r->func(params, r); 273 #ifdef RULES_DEBUG 274 if (r->var >= 0) { 275 printk(" -> "); 276 if (hw_is_mask(r->var)) 277 printk("%x", *m->bits); 278 else { 279 if (i->empty) 280 printk("empty"); 281 else 282 printk("%c%u %u%c", 283 i->openmin ? '(' : '[', i->min, 284 i->max, i->openmax ? ')' : ']'); 285 } 286 } 287 printk("\n"); 288 #endif 289 rstamps[k] = stamp; 290 if (changed && r->var >= 0) { 291 params->cmask |= (1 << r->var); 292 vstamps[r->var] = stamp; 293 again = 1; 294 } 295 if (changed < 0) 296 return changed; 297 stamp++; 298 } 299 } while (again); 300 if (!params->msbits) { 301 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 302 if (snd_interval_single(i)) 303 params->msbits = snd_interval_value(i); 304 } 305 306 if (!params->rate_den) { 307 i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); 308 if (snd_interval_single(i)) { 309 params->rate_num = snd_interval_value(i); 310 params->rate_den = 1; 311 } 312 } 313 314 hw = &substream->runtime->hw; 315 if (!params->info) 316 params->info = hw->info; 317 if (!params->fifo_size) 318 params->fifo_size = hw->fifo_size; 319 params->rmask = 0; 320 return 0; 321 } 322 323 EXPORT_SYMBOL(snd_pcm_hw_refine); 324 325 static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream, 326 struct snd_pcm_hw_params __user * _params) 327 { 328 struct snd_pcm_hw_params *params; 329 int err; 330 331 params = kmalloc(sizeof(*params), GFP_KERNEL); 332 if (!params) { 333 err = -ENOMEM; 334 goto out; 335 } 336 if (copy_from_user(params, _params, sizeof(*params))) { 337 err = -EFAULT; 338 goto out; 339 } 340 err = snd_pcm_hw_refine(substream, params); 341 if (copy_to_user(_params, params, sizeof(*params))) { 342 if (!err) 343 err = -EFAULT; 344 } 345 out: 346 kfree(params); 347 return err; 348 } 349 350 static int period_to_usecs(struct snd_pcm_runtime *runtime) 351 { 352 int usecs; 353 354 if (! runtime->rate) 355 return -1; /* invalid */ 356 357 /* take 75% of period time as the deadline */ 358 usecs = (750000 / runtime->rate) * runtime->period_size; 359 usecs += ((750000 % runtime->rate) * runtime->period_size) / 360 runtime->rate; 361 362 return usecs; 363 } 364 365 static int snd_pcm_hw_params(struct snd_pcm_substream *substream, 366 struct snd_pcm_hw_params *params) 367 { 368 struct snd_pcm_runtime *runtime; 369 int err, usecs; 370 unsigned int bits; 371 snd_pcm_uframes_t frames; 372 373 snd_assert(substream != NULL, return -ENXIO); 374 runtime = substream->runtime; 375 snd_assert(runtime != NULL, return -ENXIO); 376 snd_pcm_stream_lock_irq(substream); 377 switch (runtime->status->state) { 378 case SNDRV_PCM_STATE_OPEN: 379 case SNDRV_PCM_STATE_SETUP: 380 case SNDRV_PCM_STATE_PREPARED: 381 break; 382 default: 383 snd_pcm_stream_unlock_irq(substream); 384 return -EBADFD; 385 } 386 snd_pcm_stream_unlock_irq(substream); 387 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) 388 if (!substream->oss.oss) 389 #endif 390 if (atomic_read(&substream->mmap_count)) 391 return -EBADFD; 392 393 params->rmask = ~0U; 394 err = snd_pcm_hw_refine(substream, params); 395 if (err < 0) 396 goto _error; 397 398 err = snd_pcm_hw_params_choose(substream, params); 399 if (err < 0) 400 goto _error; 401 402 if (substream->ops->hw_params != NULL) { 403 err = substream->ops->hw_params(substream, params); 404 if (err < 0) 405 goto _error; 406 } 407 408 runtime->access = params_access(params); 409 runtime->format = params_format(params); 410 runtime->subformat = params_subformat(params); 411 runtime->channels = params_channels(params); 412 runtime->rate = params_rate(params); 413 runtime->period_size = params_period_size(params); 414 runtime->periods = params_periods(params); 415 runtime->buffer_size = params_buffer_size(params); 416 runtime->tick_time = params_tick_time(params); 417 runtime->info = params->info; 418 runtime->rate_num = params->rate_num; 419 runtime->rate_den = params->rate_den; 420 421 bits = snd_pcm_format_physical_width(runtime->format); 422 runtime->sample_bits = bits; 423 bits *= runtime->channels; 424 runtime->frame_bits = bits; 425 frames = 1; 426 while (bits % 8 != 0) { 427 bits *= 2; 428 frames *= 2; 429 } 430 runtime->byte_align = bits / 8; 431 runtime->min_align = frames; 432 433 /* Default sw params */ 434 runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE; 435 runtime->period_step = 1; 436 runtime->sleep_min = 0; 437 runtime->control->avail_min = runtime->period_size; 438 runtime->xfer_align = runtime->period_size; 439 runtime->start_threshold = 1; 440 runtime->stop_threshold = runtime->buffer_size; 441 runtime->silence_threshold = 0; 442 runtime->silence_size = 0; 443 runtime->boundary = runtime->buffer_size; 444 while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size) 445 runtime->boundary *= 2; 446 447 snd_pcm_timer_resolution_change(substream); 448 runtime->status->state = SNDRV_PCM_STATE_SETUP; 449 450 remove_acceptable_latency(substream->latency_id); 451 if ((usecs = period_to_usecs(runtime)) >= 0) 452 set_acceptable_latency(substream->latency_id, usecs); 453 return 0; 454 _error: 455 /* hardware might be unuseable from this time, 456 so we force application to retry to set 457 the correct hardware parameter settings */ 458 runtime->status->state = SNDRV_PCM_STATE_OPEN; 459 if (substream->ops->hw_free != NULL) 460 substream->ops->hw_free(substream); 461 return err; 462 } 463 464 static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream, 465 struct snd_pcm_hw_params __user * _params) 466 { 467 struct snd_pcm_hw_params *params; 468 int err; 469 470 params = kmalloc(sizeof(*params), GFP_KERNEL); 471 if (!params) { 472 err = -ENOMEM; 473 goto out; 474 } 475 if (copy_from_user(params, _params, sizeof(*params))) { 476 err = -EFAULT; 477 goto out; 478 } 479 err = snd_pcm_hw_params(substream, params); 480 if (copy_to_user(_params, params, sizeof(*params))) { 481 if (!err) 482 err = -EFAULT; 483 } 484 out: 485 kfree(params); 486 return err; 487 } 488 489 static int snd_pcm_hw_free(struct snd_pcm_substream *substream) 490 { 491 struct snd_pcm_runtime *runtime; 492 int result = 0; 493 494 snd_assert(substream != NULL, return -ENXIO); 495 runtime = substream->runtime; 496 snd_assert(runtime != NULL, return -ENXIO); 497 snd_pcm_stream_lock_irq(substream); 498 switch (runtime->status->state) { 499 case SNDRV_PCM_STATE_SETUP: 500 case SNDRV_PCM_STATE_PREPARED: 501 break; 502 default: 503 snd_pcm_stream_unlock_irq(substream); 504 return -EBADFD; 505 } 506 snd_pcm_stream_unlock_irq(substream); 507 if (atomic_read(&substream->mmap_count)) 508 return -EBADFD; 509 if (substream->ops->hw_free) 510 result = substream->ops->hw_free(substream); 511 runtime->status->state = SNDRV_PCM_STATE_OPEN; 512 remove_acceptable_latency(substream->latency_id); 513 return result; 514 } 515 516 static int snd_pcm_sw_params(struct snd_pcm_substream *substream, 517 struct snd_pcm_sw_params *params) 518 { 519 struct snd_pcm_runtime *runtime; 520 521 snd_assert(substream != NULL, return -ENXIO); 522 runtime = substream->runtime; 523 snd_assert(runtime != NULL, return -ENXIO); 524 snd_pcm_stream_lock_irq(substream); 525 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 526 snd_pcm_stream_unlock_irq(substream); 527 return -EBADFD; 528 } 529 snd_pcm_stream_unlock_irq(substream); 530 531 if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST) 532 return -EINVAL; 533 if (params->avail_min == 0) 534 return -EINVAL; 535 if (params->xfer_align == 0 || 536 params->xfer_align % runtime->min_align != 0) 537 return -EINVAL; 538 if (params->silence_size >= runtime->boundary) { 539 if (params->silence_threshold != 0) 540 return -EINVAL; 541 } else { 542 if (params->silence_size > params->silence_threshold) 543 return -EINVAL; 544 if (params->silence_threshold > runtime->buffer_size) 545 return -EINVAL; 546 } 547 snd_pcm_stream_lock_irq(substream); 548 runtime->tstamp_mode = params->tstamp_mode; 549 runtime->sleep_min = params->sleep_min; 550 runtime->period_step = params->period_step; 551 runtime->control->avail_min = params->avail_min; 552 runtime->start_threshold = params->start_threshold; 553 runtime->stop_threshold = params->stop_threshold; 554 runtime->silence_threshold = params->silence_threshold; 555 runtime->silence_size = params->silence_size; 556 runtime->xfer_align = params->xfer_align; 557 params->boundary = runtime->boundary; 558 if (snd_pcm_running(substream)) { 559 if (runtime->sleep_min) 560 snd_pcm_tick_prepare(substream); 561 else 562 snd_pcm_tick_set(substream, 0); 563 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 564 runtime->silence_size > 0) 565 snd_pcm_playback_silence(substream, ULONG_MAX); 566 wake_up(&runtime->sleep); 567 } 568 snd_pcm_stream_unlock_irq(substream); 569 return 0; 570 } 571 572 static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream, 573 struct snd_pcm_sw_params __user * _params) 574 { 575 struct snd_pcm_sw_params params; 576 int err; 577 if (copy_from_user(¶ms, _params, sizeof(params))) 578 return -EFAULT; 579 err = snd_pcm_sw_params(substream, ¶ms); 580 if (copy_to_user(_params, ¶ms, sizeof(params))) 581 return -EFAULT; 582 return err; 583 } 584 585 int snd_pcm_status(struct snd_pcm_substream *substream, 586 struct snd_pcm_status *status) 587 { 588 struct snd_pcm_runtime *runtime = substream->runtime; 589 590 snd_pcm_stream_lock_irq(substream); 591 status->state = runtime->status->state; 592 status->suspended_state = runtime->status->suspended_state; 593 if (status->state == SNDRV_PCM_STATE_OPEN) 594 goto _end; 595 status->trigger_tstamp = runtime->trigger_tstamp; 596 if (snd_pcm_running(substream)) { 597 snd_pcm_update_hw_ptr(substream); 598 if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP) 599 status->tstamp = runtime->status->tstamp; 600 else 601 getnstimeofday(&status->tstamp); 602 } else 603 getnstimeofday(&status->tstamp); 604 status->appl_ptr = runtime->control->appl_ptr; 605 status->hw_ptr = runtime->status->hw_ptr; 606 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 607 status->avail = snd_pcm_playback_avail(runtime); 608 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING || 609 runtime->status->state == SNDRV_PCM_STATE_DRAINING) 610 status->delay = runtime->buffer_size - status->avail; 611 else 612 status->delay = 0; 613 } else { 614 status->avail = snd_pcm_capture_avail(runtime); 615 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 616 status->delay = status->avail; 617 else 618 status->delay = 0; 619 } 620 status->avail_max = runtime->avail_max; 621 status->overrange = runtime->overrange; 622 runtime->avail_max = 0; 623 runtime->overrange = 0; 624 _end: 625 snd_pcm_stream_unlock_irq(substream); 626 return 0; 627 } 628 629 static int snd_pcm_status_user(struct snd_pcm_substream *substream, 630 struct snd_pcm_status __user * _status) 631 { 632 struct snd_pcm_status status; 633 struct snd_pcm_runtime *runtime; 634 int res; 635 636 snd_assert(substream != NULL, return -ENXIO); 637 runtime = substream->runtime; 638 memset(&status, 0, sizeof(status)); 639 res = snd_pcm_status(substream, &status); 640 if (res < 0) 641 return res; 642 if (copy_to_user(_status, &status, sizeof(status))) 643 return -EFAULT; 644 return 0; 645 } 646 647 static int snd_pcm_channel_info(struct snd_pcm_substream *substream, 648 struct snd_pcm_channel_info * info) 649 { 650 struct snd_pcm_runtime *runtime; 651 unsigned int channel; 652 653 snd_assert(substream != NULL, return -ENXIO); 654 channel = info->channel; 655 runtime = substream->runtime; 656 snd_pcm_stream_lock_irq(substream); 657 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 658 snd_pcm_stream_unlock_irq(substream); 659 return -EBADFD; 660 } 661 snd_pcm_stream_unlock_irq(substream); 662 if (channel >= runtime->channels) 663 return -EINVAL; 664 memset(info, 0, sizeof(*info)); 665 info->channel = channel; 666 return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info); 667 } 668 669 static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream, 670 struct snd_pcm_channel_info __user * _info) 671 { 672 struct snd_pcm_channel_info info; 673 int res; 674 675 if (copy_from_user(&info, _info, sizeof(info))) 676 return -EFAULT; 677 res = snd_pcm_channel_info(substream, &info); 678 if (res < 0) 679 return res; 680 if (copy_to_user(_info, &info, sizeof(info))) 681 return -EFAULT; 682 return 0; 683 } 684 685 static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream) 686 { 687 struct snd_pcm_runtime *runtime = substream->runtime; 688 if (runtime->trigger_master == NULL) 689 return; 690 if (runtime->trigger_master == substream) { 691 getnstimeofday(&runtime->trigger_tstamp); 692 } else { 693 snd_pcm_trigger_tstamp(runtime->trigger_master); 694 runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp; 695 } 696 runtime->trigger_master = NULL; 697 } 698 699 struct action_ops { 700 int (*pre_action)(struct snd_pcm_substream *substream, int state); 701 int (*do_action)(struct snd_pcm_substream *substream, int state); 702 void (*undo_action)(struct snd_pcm_substream *substream, int state); 703 void (*post_action)(struct snd_pcm_substream *substream, int state); 704 }; 705 706 /* 707 * this functions is core for handling of linked stream 708 * Note: the stream state might be changed also on failure 709 * Note2: call with calling stream lock + link lock 710 */ 711 static int snd_pcm_action_group(struct action_ops *ops, 712 struct snd_pcm_substream *substream, 713 int state, int do_lock) 714 { 715 struct snd_pcm_substream *s = NULL; 716 struct snd_pcm_substream *s1; 717 int res = 0; 718 719 snd_pcm_group_for_each_entry(s, substream) { 720 if (do_lock && s != substream) 721 spin_lock_nested(&s->self_group.lock, 722 SINGLE_DEPTH_NESTING); 723 res = ops->pre_action(s, state); 724 if (res < 0) 725 goto _unlock; 726 } 727 snd_pcm_group_for_each_entry(s, substream) { 728 res = ops->do_action(s, state); 729 if (res < 0) { 730 if (ops->undo_action) { 731 snd_pcm_group_for_each_entry(s1, substream) { 732 if (s1 == s) /* failed stream */ 733 break; 734 ops->undo_action(s1, state); 735 } 736 } 737 s = NULL; /* unlock all */ 738 goto _unlock; 739 } 740 } 741 snd_pcm_group_for_each_entry(s, substream) { 742 ops->post_action(s, state); 743 } 744 _unlock: 745 if (do_lock) { 746 /* unlock streams */ 747 snd_pcm_group_for_each_entry(s1, substream) { 748 if (s1 != substream) 749 spin_unlock(&s1->self_group.lock); 750 if (s1 == s) /* end */ 751 break; 752 } 753 } 754 return res; 755 } 756 757 /* 758 * Note: call with stream lock 759 */ 760 static int snd_pcm_action_single(struct action_ops *ops, 761 struct snd_pcm_substream *substream, 762 int state) 763 { 764 int res; 765 766 res = ops->pre_action(substream, state); 767 if (res < 0) 768 return res; 769 res = ops->do_action(substream, state); 770 if (res == 0) 771 ops->post_action(substream, state); 772 else if (ops->undo_action) 773 ops->undo_action(substream, state); 774 return res; 775 } 776 777 /* 778 * Note: call with stream lock 779 */ 780 static int snd_pcm_action(struct action_ops *ops, 781 struct snd_pcm_substream *substream, 782 int state) 783 { 784 int res; 785 786 if (snd_pcm_stream_linked(substream)) { 787 if (!spin_trylock(&substream->group->lock)) { 788 spin_unlock(&substream->self_group.lock); 789 spin_lock(&substream->group->lock); 790 spin_lock(&substream->self_group.lock); 791 } 792 res = snd_pcm_action_group(ops, substream, state, 1); 793 spin_unlock(&substream->group->lock); 794 } else { 795 res = snd_pcm_action_single(ops, substream, state); 796 } 797 return res; 798 } 799 800 /* 801 * Note: don't use any locks before 802 */ 803 static int snd_pcm_action_lock_irq(struct action_ops *ops, 804 struct snd_pcm_substream *substream, 805 int state) 806 { 807 int res; 808 809 read_lock_irq(&snd_pcm_link_rwlock); 810 if (snd_pcm_stream_linked(substream)) { 811 spin_lock(&substream->group->lock); 812 spin_lock(&substream->self_group.lock); 813 res = snd_pcm_action_group(ops, substream, state, 1); 814 spin_unlock(&substream->self_group.lock); 815 spin_unlock(&substream->group->lock); 816 } else { 817 spin_lock(&substream->self_group.lock); 818 res = snd_pcm_action_single(ops, substream, state); 819 spin_unlock(&substream->self_group.lock); 820 } 821 read_unlock_irq(&snd_pcm_link_rwlock); 822 return res; 823 } 824 825 /* 826 */ 827 static int snd_pcm_action_nonatomic(struct action_ops *ops, 828 struct snd_pcm_substream *substream, 829 int state) 830 { 831 int res; 832 833 down_read(&snd_pcm_link_rwsem); 834 if (snd_pcm_stream_linked(substream)) 835 res = snd_pcm_action_group(ops, substream, state, 0); 836 else 837 res = snd_pcm_action_single(ops, substream, state); 838 up_read(&snd_pcm_link_rwsem); 839 return res; 840 } 841 842 /* 843 * start callbacks 844 */ 845 static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state) 846 { 847 struct snd_pcm_runtime *runtime = substream->runtime; 848 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED) 849 return -EBADFD; 850 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 851 !snd_pcm_playback_data(substream)) 852 return -EPIPE; 853 runtime->trigger_master = substream; 854 return 0; 855 } 856 857 static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state) 858 { 859 if (substream->runtime->trigger_master != substream) 860 return 0; 861 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START); 862 } 863 864 static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state) 865 { 866 if (substream->runtime->trigger_master == substream) 867 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 868 } 869 870 static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state) 871 { 872 struct snd_pcm_runtime *runtime = substream->runtime; 873 snd_pcm_trigger_tstamp(substream); 874 runtime->status->state = state; 875 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 876 runtime->silence_size > 0) 877 snd_pcm_playback_silence(substream, ULONG_MAX); 878 if (runtime->sleep_min) 879 snd_pcm_tick_prepare(substream); 880 if (substream->timer) 881 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART, 882 &runtime->trigger_tstamp); 883 } 884 885 static struct action_ops snd_pcm_action_start = { 886 .pre_action = snd_pcm_pre_start, 887 .do_action = snd_pcm_do_start, 888 .undo_action = snd_pcm_undo_start, 889 .post_action = snd_pcm_post_start 890 }; 891 892 /** 893 * snd_pcm_start 894 * @substream: the PCM substream instance 895 * 896 * Start all linked streams. 897 */ 898 int snd_pcm_start(struct snd_pcm_substream *substream) 899 { 900 return snd_pcm_action(&snd_pcm_action_start, substream, 901 SNDRV_PCM_STATE_RUNNING); 902 } 903 904 /* 905 * stop callbacks 906 */ 907 static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state) 908 { 909 struct snd_pcm_runtime *runtime = substream->runtime; 910 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 911 return -EBADFD; 912 runtime->trigger_master = substream; 913 return 0; 914 } 915 916 static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state) 917 { 918 if (substream->runtime->trigger_master == substream && 919 snd_pcm_running(substream)) 920 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP); 921 return 0; /* unconditonally stop all substreams */ 922 } 923 924 static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state) 925 { 926 struct snd_pcm_runtime *runtime = substream->runtime; 927 if (runtime->status->state != state) { 928 snd_pcm_trigger_tstamp(substream); 929 if (substream->timer) 930 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP, 931 &runtime->trigger_tstamp); 932 runtime->status->state = state; 933 snd_pcm_tick_set(substream, 0); 934 } 935 wake_up(&runtime->sleep); 936 } 937 938 static struct action_ops snd_pcm_action_stop = { 939 .pre_action = snd_pcm_pre_stop, 940 .do_action = snd_pcm_do_stop, 941 .post_action = snd_pcm_post_stop 942 }; 943 944 /** 945 * snd_pcm_stop 946 * @substream: the PCM substream instance 947 * @state: PCM state after stopping the stream 948 * 949 * Try to stop all running streams in the substream group. 950 * The state of each stream is changed to the given value after that unconditionally. 951 */ 952 int snd_pcm_stop(struct snd_pcm_substream *substream, int state) 953 { 954 return snd_pcm_action(&snd_pcm_action_stop, substream, state); 955 } 956 957 EXPORT_SYMBOL(snd_pcm_stop); 958 959 /** 960 * snd_pcm_drain_done 961 * @substream: the PCM substream 962 * 963 * Stop the DMA only when the given stream is playback. 964 * The state is changed to SETUP. 965 * Unlike snd_pcm_stop(), this affects only the given stream. 966 */ 967 int snd_pcm_drain_done(struct snd_pcm_substream *substream) 968 { 969 return snd_pcm_action_single(&snd_pcm_action_stop, substream, 970 SNDRV_PCM_STATE_SETUP); 971 } 972 973 /* 974 * pause callbacks 975 */ 976 static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push) 977 { 978 struct snd_pcm_runtime *runtime = substream->runtime; 979 if (!(runtime->info & SNDRV_PCM_INFO_PAUSE)) 980 return -ENOSYS; 981 if (push) { 982 if (runtime->status->state != SNDRV_PCM_STATE_RUNNING) 983 return -EBADFD; 984 } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED) 985 return -EBADFD; 986 runtime->trigger_master = substream; 987 return 0; 988 } 989 990 static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push) 991 { 992 if (substream->runtime->trigger_master != substream) 993 return 0; 994 return substream->ops->trigger(substream, 995 push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH : 996 SNDRV_PCM_TRIGGER_PAUSE_RELEASE); 997 } 998 999 static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push) 1000 { 1001 if (substream->runtime->trigger_master == substream) 1002 substream->ops->trigger(substream, 1003 push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE : 1004 SNDRV_PCM_TRIGGER_PAUSE_PUSH); 1005 } 1006 1007 static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push) 1008 { 1009 struct snd_pcm_runtime *runtime = substream->runtime; 1010 snd_pcm_trigger_tstamp(substream); 1011 if (push) { 1012 runtime->status->state = SNDRV_PCM_STATE_PAUSED; 1013 if (substream->timer) 1014 snd_timer_notify(substream->timer, 1015 SNDRV_TIMER_EVENT_MPAUSE, 1016 &runtime->trigger_tstamp); 1017 snd_pcm_tick_set(substream, 0); 1018 wake_up(&runtime->sleep); 1019 } else { 1020 runtime->status->state = SNDRV_PCM_STATE_RUNNING; 1021 if (runtime->sleep_min) 1022 snd_pcm_tick_prepare(substream); 1023 if (substream->timer) 1024 snd_timer_notify(substream->timer, 1025 SNDRV_TIMER_EVENT_MCONTINUE, 1026 &runtime->trigger_tstamp); 1027 } 1028 } 1029 1030 static struct action_ops snd_pcm_action_pause = { 1031 .pre_action = snd_pcm_pre_pause, 1032 .do_action = snd_pcm_do_pause, 1033 .undo_action = snd_pcm_undo_pause, 1034 .post_action = snd_pcm_post_pause 1035 }; 1036 1037 /* 1038 * Push/release the pause for all linked streams. 1039 */ 1040 static int snd_pcm_pause(struct snd_pcm_substream *substream, int push) 1041 { 1042 return snd_pcm_action(&snd_pcm_action_pause, substream, push); 1043 } 1044 1045 #ifdef CONFIG_PM 1046 /* suspend */ 1047 1048 static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state) 1049 { 1050 struct snd_pcm_runtime *runtime = substream->runtime; 1051 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1052 return -EBUSY; 1053 runtime->trigger_master = substream; 1054 return 0; 1055 } 1056 1057 static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state) 1058 { 1059 struct snd_pcm_runtime *runtime = substream->runtime; 1060 if (runtime->trigger_master != substream) 1061 return 0; 1062 if (! snd_pcm_running(substream)) 1063 return 0; 1064 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1065 return 0; /* suspend unconditionally */ 1066 } 1067 1068 static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state) 1069 { 1070 struct snd_pcm_runtime *runtime = substream->runtime; 1071 snd_pcm_trigger_tstamp(substream); 1072 if (substream->timer) 1073 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND, 1074 &runtime->trigger_tstamp); 1075 runtime->status->suspended_state = runtime->status->state; 1076 runtime->status->state = SNDRV_PCM_STATE_SUSPENDED; 1077 snd_pcm_tick_set(substream, 0); 1078 wake_up(&runtime->sleep); 1079 } 1080 1081 static struct action_ops snd_pcm_action_suspend = { 1082 .pre_action = snd_pcm_pre_suspend, 1083 .do_action = snd_pcm_do_suspend, 1084 .post_action = snd_pcm_post_suspend 1085 }; 1086 1087 /** 1088 * snd_pcm_suspend 1089 * @substream: the PCM substream 1090 * 1091 * Trigger SUSPEND to all linked streams. 1092 * After this call, all streams are changed to SUSPENDED state. 1093 */ 1094 int snd_pcm_suspend(struct snd_pcm_substream *substream) 1095 { 1096 int err; 1097 unsigned long flags; 1098 1099 if (! substream) 1100 return 0; 1101 1102 snd_pcm_stream_lock_irqsave(substream, flags); 1103 err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0); 1104 snd_pcm_stream_unlock_irqrestore(substream, flags); 1105 return err; 1106 } 1107 1108 EXPORT_SYMBOL(snd_pcm_suspend); 1109 1110 /** 1111 * snd_pcm_suspend_all 1112 * @pcm: the PCM instance 1113 * 1114 * Trigger SUSPEND to all substreams in the given pcm. 1115 * After this call, all streams are changed to SUSPENDED state. 1116 */ 1117 int snd_pcm_suspend_all(struct snd_pcm *pcm) 1118 { 1119 struct snd_pcm_substream *substream; 1120 int stream, err = 0; 1121 1122 if (! pcm) 1123 return 0; 1124 1125 for (stream = 0; stream < 2; stream++) { 1126 for (substream = pcm->streams[stream].substream; 1127 substream; substream = substream->next) { 1128 /* FIXME: the open/close code should lock this as well */ 1129 if (substream->runtime == NULL) 1130 continue; 1131 err = snd_pcm_suspend(substream); 1132 if (err < 0 && err != -EBUSY) 1133 return err; 1134 } 1135 } 1136 return 0; 1137 } 1138 1139 EXPORT_SYMBOL(snd_pcm_suspend_all); 1140 1141 /* resume */ 1142 1143 static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state) 1144 { 1145 struct snd_pcm_runtime *runtime = substream->runtime; 1146 if (!(runtime->info & SNDRV_PCM_INFO_RESUME)) 1147 return -ENOSYS; 1148 runtime->trigger_master = substream; 1149 return 0; 1150 } 1151 1152 static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state) 1153 { 1154 struct snd_pcm_runtime *runtime = substream->runtime; 1155 if (runtime->trigger_master != substream) 1156 return 0; 1157 /* DMA not running previously? */ 1158 if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING && 1159 (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING || 1160 substream->stream != SNDRV_PCM_STREAM_PLAYBACK)) 1161 return 0; 1162 return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME); 1163 } 1164 1165 static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state) 1166 { 1167 if (substream->runtime->trigger_master == substream && 1168 snd_pcm_running(substream)) 1169 substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND); 1170 } 1171 1172 static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state) 1173 { 1174 struct snd_pcm_runtime *runtime = substream->runtime; 1175 snd_pcm_trigger_tstamp(substream); 1176 if (substream->timer) 1177 snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME, 1178 &runtime->trigger_tstamp); 1179 runtime->status->state = runtime->status->suspended_state; 1180 if (runtime->sleep_min) 1181 snd_pcm_tick_prepare(substream); 1182 } 1183 1184 static struct action_ops snd_pcm_action_resume = { 1185 .pre_action = snd_pcm_pre_resume, 1186 .do_action = snd_pcm_do_resume, 1187 .undo_action = snd_pcm_undo_resume, 1188 .post_action = snd_pcm_post_resume 1189 }; 1190 1191 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1192 { 1193 struct snd_card *card = substream->pcm->card; 1194 int res; 1195 1196 snd_power_lock(card); 1197 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1198 res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0); 1199 snd_power_unlock(card); 1200 return res; 1201 } 1202 1203 #else 1204 1205 static int snd_pcm_resume(struct snd_pcm_substream *substream) 1206 { 1207 return -ENOSYS; 1208 } 1209 1210 #endif /* CONFIG_PM */ 1211 1212 /* 1213 * xrun ioctl 1214 * 1215 * Change the RUNNING stream(s) to XRUN state. 1216 */ 1217 static int snd_pcm_xrun(struct snd_pcm_substream *substream) 1218 { 1219 struct snd_card *card = substream->pcm->card; 1220 struct snd_pcm_runtime *runtime = substream->runtime; 1221 int result; 1222 1223 snd_power_lock(card); 1224 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1225 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1226 if (result < 0) 1227 goto _unlock; 1228 } 1229 1230 snd_pcm_stream_lock_irq(substream); 1231 switch (runtime->status->state) { 1232 case SNDRV_PCM_STATE_XRUN: 1233 result = 0; /* already there */ 1234 break; 1235 case SNDRV_PCM_STATE_RUNNING: 1236 result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 1237 break; 1238 default: 1239 result = -EBADFD; 1240 } 1241 snd_pcm_stream_unlock_irq(substream); 1242 _unlock: 1243 snd_power_unlock(card); 1244 return result; 1245 } 1246 1247 /* 1248 * reset ioctl 1249 */ 1250 static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state) 1251 { 1252 struct snd_pcm_runtime *runtime = substream->runtime; 1253 switch (runtime->status->state) { 1254 case SNDRV_PCM_STATE_RUNNING: 1255 case SNDRV_PCM_STATE_PREPARED: 1256 case SNDRV_PCM_STATE_PAUSED: 1257 case SNDRV_PCM_STATE_SUSPENDED: 1258 return 0; 1259 default: 1260 return -EBADFD; 1261 } 1262 } 1263 1264 static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state) 1265 { 1266 struct snd_pcm_runtime *runtime = substream->runtime; 1267 int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL); 1268 if (err < 0) 1269 return err; 1270 // snd_assert(runtime->status->hw_ptr < runtime->buffer_size, ); 1271 runtime->hw_ptr_base = 0; 1272 runtime->hw_ptr_interrupt = runtime->status->hw_ptr - 1273 runtime->status->hw_ptr % runtime->period_size; 1274 runtime->silence_start = runtime->status->hw_ptr; 1275 runtime->silence_filled = 0; 1276 return 0; 1277 } 1278 1279 static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state) 1280 { 1281 struct snd_pcm_runtime *runtime = substream->runtime; 1282 runtime->control->appl_ptr = runtime->status->hw_ptr; 1283 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 1284 runtime->silence_size > 0) 1285 snd_pcm_playback_silence(substream, ULONG_MAX); 1286 } 1287 1288 static struct action_ops snd_pcm_action_reset = { 1289 .pre_action = snd_pcm_pre_reset, 1290 .do_action = snd_pcm_do_reset, 1291 .post_action = snd_pcm_post_reset 1292 }; 1293 1294 static int snd_pcm_reset(struct snd_pcm_substream *substream) 1295 { 1296 return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0); 1297 } 1298 1299 /* 1300 * prepare ioctl 1301 */ 1302 /* we use the second argument for updating f_flags */ 1303 static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream, 1304 int f_flags) 1305 { 1306 struct snd_pcm_runtime *runtime = substream->runtime; 1307 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1308 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1309 return -EBADFD; 1310 if (snd_pcm_running(substream)) 1311 return -EBUSY; 1312 substream->f_flags = f_flags; 1313 return 0; 1314 } 1315 1316 static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state) 1317 { 1318 int err; 1319 err = substream->ops->prepare(substream); 1320 if (err < 0) 1321 return err; 1322 return snd_pcm_do_reset(substream, 0); 1323 } 1324 1325 static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state) 1326 { 1327 struct snd_pcm_runtime *runtime = substream->runtime; 1328 runtime->control->appl_ptr = runtime->status->hw_ptr; 1329 runtime->status->state = SNDRV_PCM_STATE_PREPARED; 1330 } 1331 1332 static struct action_ops snd_pcm_action_prepare = { 1333 .pre_action = snd_pcm_pre_prepare, 1334 .do_action = snd_pcm_do_prepare, 1335 .post_action = snd_pcm_post_prepare 1336 }; 1337 1338 /** 1339 * snd_pcm_prepare 1340 * @substream: the PCM substream instance 1341 * @file: file to refer f_flags 1342 * 1343 * Prepare the PCM substream to be triggerable. 1344 */ 1345 static int snd_pcm_prepare(struct snd_pcm_substream *substream, 1346 struct file *file) 1347 { 1348 int res; 1349 struct snd_card *card = substream->pcm->card; 1350 int f_flags; 1351 1352 if (file) 1353 f_flags = file->f_flags; 1354 else 1355 f_flags = substream->f_flags; 1356 1357 snd_power_lock(card); 1358 if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0) 1359 res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare, 1360 substream, f_flags); 1361 snd_power_unlock(card); 1362 return res; 1363 } 1364 1365 /* 1366 * drain ioctl 1367 */ 1368 1369 static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state) 1370 { 1371 if (substream->f_flags & O_NONBLOCK) 1372 return -EAGAIN; 1373 substream->runtime->trigger_master = substream; 1374 return 0; 1375 } 1376 1377 static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state) 1378 { 1379 struct snd_pcm_runtime *runtime = substream->runtime; 1380 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1381 switch (runtime->status->state) { 1382 case SNDRV_PCM_STATE_PREPARED: 1383 /* start playback stream if possible */ 1384 if (! snd_pcm_playback_empty(substream)) { 1385 snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING); 1386 snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING); 1387 } 1388 break; 1389 case SNDRV_PCM_STATE_RUNNING: 1390 runtime->status->state = SNDRV_PCM_STATE_DRAINING; 1391 break; 1392 default: 1393 break; 1394 } 1395 } else { 1396 /* stop running stream */ 1397 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) { 1398 int state = snd_pcm_capture_avail(runtime) > 0 ? 1399 SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP; 1400 snd_pcm_do_stop(substream, state); 1401 snd_pcm_post_stop(substream, state); 1402 } 1403 } 1404 return 0; 1405 } 1406 1407 static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state) 1408 { 1409 } 1410 1411 static struct action_ops snd_pcm_action_drain_init = { 1412 .pre_action = snd_pcm_pre_drain_init, 1413 .do_action = snd_pcm_do_drain_init, 1414 .post_action = snd_pcm_post_drain_init 1415 }; 1416 1417 struct drain_rec { 1418 struct snd_pcm_substream *substream; 1419 wait_queue_t wait; 1420 snd_pcm_uframes_t stop_threshold; 1421 }; 1422 1423 static int snd_pcm_drop(struct snd_pcm_substream *substream); 1424 1425 /* 1426 * Drain the stream(s). 1427 * When the substream is linked, sync until the draining of all playback streams 1428 * is finished. 1429 * After this call, all streams are supposed to be either SETUP or DRAINING 1430 * (capture only) state. 1431 */ 1432 static int snd_pcm_drain(struct snd_pcm_substream *substream) 1433 { 1434 struct snd_card *card; 1435 struct snd_pcm_runtime *runtime; 1436 struct snd_pcm_substream *s; 1437 int result = 0; 1438 int i, num_drecs; 1439 struct drain_rec *drec, drec_tmp, *d; 1440 1441 snd_assert(substream != NULL, return -ENXIO); 1442 card = substream->pcm->card; 1443 runtime = substream->runtime; 1444 1445 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1446 return -EBADFD; 1447 1448 snd_power_lock(card); 1449 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1450 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1451 if (result < 0) { 1452 snd_power_unlock(card); 1453 return result; 1454 } 1455 } 1456 1457 /* allocate temporary record for drain sync */ 1458 down_read(&snd_pcm_link_rwsem); 1459 if (snd_pcm_stream_linked(substream)) { 1460 drec = kmalloc(substream->group->count * sizeof(*drec), GFP_KERNEL); 1461 if (! drec) { 1462 up_read(&snd_pcm_link_rwsem); 1463 snd_power_unlock(card); 1464 return -ENOMEM; 1465 } 1466 } else 1467 drec = &drec_tmp; 1468 1469 /* count only playback streams */ 1470 num_drecs = 0; 1471 snd_pcm_group_for_each_entry(s, substream) { 1472 runtime = s->runtime; 1473 if (s->stream == SNDRV_PCM_STREAM_PLAYBACK) { 1474 d = &drec[num_drecs++]; 1475 d->substream = s; 1476 init_waitqueue_entry(&d->wait, current); 1477 add_wait_queue(&runtime->sleep, &d->wait); 1478 /* stop_threshold fixup to avoid endless loop when 1479 * stop_threshold > buffer_size 1480 */ 1481 d->stop_threshold = runtime->stop_threshold; 1482 if (runtime->stop_threshold > runtime->buffer_size) 1483 runtime->stop_threshold = runtime->buffer_size; 1484 } 1485 } 1486 up_read(&snd_pcm_link_rwsem); 1487 1488 snd_pcm_stream_lock_irq(substream); 1489 /* resume pause */ 1490 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1491 snd_pcm_pause(substream, 0); 1492 1493 /* pre-start/stop - all running streams are changed to DRAINING state */ 1494 result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0); 1495 if (result < 0) { 1496 snd_pcm_stream_unlock_irq(substream); 1497 goto _error; 1498 } 1499 1500 for (;;) { 1501 long tout; 1502 if (signal_pending(current)) { 1503 result = -ERESTARTSYS; 1504 break; 1505 } 1506 /* all finished? */ 1507 for (i = 0; i < num_drecs; i++) { 1508 runtime = drec[i].substream->runtime; 1509 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) 1510 break; 1511 } 1512 if (i == num_drecs) 1513 break; /* yes, all drained */ 1514 1515 set_current_state(TASK_INTERRUPTIBLE); 1516 snd_pcm_stream_unlock_irq(substream); 1517 snd_power_unlock(card); 1518 tout = schedule_timeout(10 * HZ); 1519 snd_power_lock(card); 1520 snd_pcm_stream_lock_irq(substream); 1521 if (tout == 0) { 1522 if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) 1523 result = -ESTRPIPE; 1524 else { 1525 snd_printd("playback drain error (DMA or IRQ trouble?)\n"); 1526 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1527 result = -EIO; 1528 } 1529 break; 1530 } 1531 } 1532 1533 snd_pcm_stream_unlock_irq(substream); 1534 1535 _error: 1536 for (i = 0; i < num_drecs; i++) { 1537 d = &drec[i]; 1538 runtime = d->substream->runtime; 1539 remove_wait_queue(&runtime->sleep, &d->wait); 1540 runtime->stop_threshold = d->stop_threshold; 1541 } 1542 1543 if (drec != &drec_tmp) 1544 kfree(drec); 1545 snd_power_unlock(card); 1546 1547 return result; 1548 } 1549 1550 /* 1551 * drop ioctl 1552 * 1553 * Immediately put all linked substreams into SETUP state. 1554 */ 1555 static int snd_pcm_drop(struct snd_pcm_substream *substream) 1556 { 1557 struct snd_pcm_runtime *runtime; 1558 struct snd_card *card; 1559 int result = 0; 1560 1561 snd_assert(substream != NULL, return -ENXIO); 1562 runtime = substream->runtime; 1563 card = substream->pcm->card; 1564 1565 if (runtime->status->state == SNDRV_PCM_STATE_OPEN || 1566 runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED) 1567 return -EBADFD; 1568 1569 snd_power_lock(card); 1570 if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) { 1571 result = snd_power_wait(card, SNDRV_CTL_POWER_D0); 1572 if (result < 0) 1573 goto _unlock; 1574 } 1575 1576 snd_pcm_stream_lock_irq(substream); 1577 /* resume pause */ 1578 if (runtime->status->state == SNDRV_PCM_STATE_PAUSED) 1579 snd_pcm_pause(substream, 0); 1580 1581 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 1582 /* runtime->control->appl_ptr = runtime->status->hw_ptr; */ 1583 snd_pcm_stream_unlock_irq(substream); 1584 _unlock: 1585 snd_power_unlock(card); 1586 return result; 1587 } 1588 1589 1590 /* WARNING: Don't forget to fput back the file */ 1591 static struct file *snd_pcm_file_fd(int fd) 1592 { 1593 struct file *file; 1594 struct inode *inode; 1595 unsigned int minor; 1596 1597 file = fget(fd); 1598 if (!file) 1599 return NULL; 1600 inode = file->f_path.dentry->d_inode; 1601 if (!S_ISCHR(inode->i_mode) || 1602 imajor(inode) != snd_major) { 1603 fput(file); 1604 return NULL; 1605 } 1606 minor = iminor(inode); 1607 if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) && 1608 !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) { 1609 fput(file); 1610 return NULL; 1611 } 1612 return file; 1613 } 1614 1615 /* 1616 * PCM link handling 1617 */ 1618 static int snd_pcm_link(struct snd_pcm_substream *substream, int fd) 1619 { 1620 int res = 0; 1621 struct file *file; 1622 struct snd_pcm_file *pcm_file; 1623 struct snd_pcm_substream *substream1; 1624 1625 file = snd_pcm_file_fd(fd); 1626 if (!file) 1627 return -EBADFD; 1628 pcm_file = file->private_data; 1629 substream1 = pcm_file->substream; 1630 down_write(&snd_pcm_link_rwsem); 1631 write_lock_irq(&snd_pcm_link_rwlock); 1632 if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN || 1633 substream->runtime->status->state != substream1->runtime->status->state) { 1634 res = -EBADFD; 1635 goto _end; 1636 } 1637 if (snd_pcm_stream_linked(substream1)) { 1638 res = -EALREADY; 1639 goto _end; 1640 } 1641 if (!snd_pcm_stream_linked(substream)) { 1642 substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC); 1643 if (substream->group == NULL) { 1644 res = -ENOMEM; 1645 goto _end; 1646 } 1647 spin_lock_init(&substream->group->lock); 1648 INIT_LIST_HEAD(&substream->group->substreams); 1649 list_add_tail(&substream->link_list, &substream->group->substreams); 1650 substream->group->count = 1; 1651 } 1652 list_add_tail(&substream1->link_list, &substream->group->substreams); 1653 substream->group->count++; 1654 substream1->group = substream->group; 1655 _end: 1656 write_unlock_irq(&snd_pcm_link_rwlock); 1657 up_write(&snd_pcm_link_rwsem); 1658 fput(file); 1659 return res; 1660 } 1661 1662 static void relink_to_local(struct snd_pcm_substream *substream) 1663 { 1664 substream->group = &substream->self_group; 1665 INIT_LIST_HEAD(&substream->self_group.substreams); 1666 list_add_tail(&substream->link_list, &substream->self_group.substreams); 1667 } 1668 1669 static int snd_pcm_unlink(struct snd_pcm_substream *substream) 1670 { 1671 struct snd_pcm_substream *s; 1672 int res = 0; 1673 1674 down_write(&snd_pcm_link_rwsem); 1675 write_lock_irq(&snd_pcm_link_rwlock); 1676 if (!snd_pcm_stream_linked(substream)) { 1677 res = -EALREADY; 1678 goto _end; 1679 } 1680 list_del(&substream->link_list); 1681 substream->group->count--; 1682 if (substream->group->count == 1) { /* detach the last stream, too */ 1683 snd_pcm_group_for_each_entry(s, substream) { 1684 relink_to_local(s); 1685 break; 1686 } 1687 kfree(substream->group); 1688 } 1689 relink_to_local(substream); 1690 _end: 1691 write_unlock_irq(&snd_pcm_link_rwlock); 1692 up_write(&snd_pcm_link_rwsem); 1693 return res; 1694 } 1695 1696 /* 1697 * hw configurator 1698 */ 1699 static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params, 1700 struct snd_pcm_hw_rule *rule) 1701 { 1702 struct snd_interval t; 1703 snd_interval_mul(hw_param_interval_c(params, rule->deps[0]), 1704 hw_param_interval_c(params, rule->deps[1]), &t); 1705 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1706 } 1707 1708 static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params, 1709 struct snd_pcm_hw_rule *rule) 1710 { 1711 struct snd_interval t; 1712 snd_interval_div(hw_param_interval_c(params, rule->deps[0]), 1713 hw_param_interval_c(params, rule->deps[1]), &t); 1714 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1715 } 1716 1717 static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params, 1718 struct snd_pcm_hw_rule *rule) 1719 { 1720 struct snd_interval t; 1721 snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]), 1722 hw_param_interval_c(params, rule->deps[1]), 1723 (unsigned long) rule->private, &t); 1724 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1725 } 1726 1727 static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params, 1728 struct snd_pcm_hw_rule *rule) 1729 { 1730 struct snd_interval t; 1731 snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]), 1732 (unsigned long) rule->private, 1733 hw_param_interval_c(params, rule->deps[1]), &t); 1734 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1735 } 1736 1737 static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params, 1738 struct snd_pcm_hw_rule *rule) 1739 { 1740 unsigned int k; 1741 struct snd_interval *i = hw_param_interval(params, rule->deps[0]); 1742 struct snd_mask m; 1743 struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT); 1744 snd_mask_any(&m); 1745 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1746 int bits; 1747 if (! snd_mask_test(mask, k)) 1748 continue; 1749 bits = snd_pcm_format_physical_width(k); 1750 if (bits <= 0) 1751 continue; /* ignore invalid formats */ 1752 if ((unsigned)bits < i->min || (unsigned)bits > i->max) 1753 snd_mask_reset(&m, k); 1754 } 1755 return snd_mask_refine(mask, &m); 1756 } 1757 1758 static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params, 1759 struct snd_pcm_hw_rule *rule) 1760 { 1761 struct snd_interval t; 1762 unsigned int k; 1763 t.min = UINT_MAX; 1764 t.max = 0; 1765 t.openmin = 0; 1766 t.openmax = 0; 1767 for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) { 1768 int bits; 1769 if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k)) 1770 continue; 1771 bits = snd_pcm_format_physical_width(k); 1772 if (bits <= 0) 1773 continue; /* ignore invalid formats */ 1774 if (t.min > (unsigned)bits) 1775 t.min = bits; 1776 if (t.max < (unsigned)bits) 1777 t.max = bits; 1778 } 1779 t.integer = 1; 1780 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1781 } 1782 1783 #if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12 1784 #error "Change this table" 1785 #endif 1786 1787 static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100, 1788 48000, 64000, 88200, 96000, 176400, 192000 }; 1789 1790 static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params, 1791 struct snd_pcm_hw_rule *rule) 1792 { 1793 struct snd_pcm_hardware *hw = rule->private; 1794 return snd_interval_list(hw_param_interval(params, rule->var), 1795 ARRAY_SIZE(rates), rates, hw->rates); 1796 } 1797 1798 static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params, 1799 struct snd_pcm_hw_rule *rule) 1800 { 1801 struct snd_interval t; 1802 struct snd_pcm_substream *substream = rule->private; 1803 t.min = 0; 1804 t.max = substream->buffer_bytes_max; 1805 t.openmin = 0; 1806 t.openmax = 0; 1807 t.integer = 1; 1808 return snd_interval_refine(hw_param_interval(params, rule->var), &t); 1809 } 1810 1811 int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream) 1812 { 1813 struct snd_pcm_runtime *runtime = substream->runtime; 1814 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1815 int k, err; 1816 1817 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) { 1818 snd_mask_any(constrs_mask(constrs, k)); 1819 } 1820 1821 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) { 1822 snd_interval_any(constrs_interval(constrs, k)); 1823 } 1824 1825 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS)); 1826 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE)); 1827 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES)); 1828 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)); 1829 snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS)); 1830 1831 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT, 1832 snd_pcm_hw_rule_format, NULL, 1833 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1834 if (err < 0) 1835 return err; 1836 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1837 snd_pcm_hw_rule_sample_bits, NULL, 1838 SNDRV_PCM_HW_PARAM_FORMAT, 1839 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1840 if (err < 0) 1841 return err; 1842 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, 1843 snd_pcm_hw_rule_div, NULL, 1844 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1845 if (err < 0) 1846 return err; 1847 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1848 snd_pcm_hw_rule_mul, NULL, 1849 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1); 1850 if (err < 0) 1851 return err; 1852 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1853 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1854 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1855 if (err < 0) 1856 return err; 1857 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS, 1858 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1859 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1); 1860 if (err < 0) 1861 return err; 1862 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS, 1863 snd_pcm_hw_rule_div, NULL, 1864 SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1865 if (err < 0) 1866 return err; 1867 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1868 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1869 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1); 1870 if (err < 0) 1871 return err; 1872 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1873 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1874 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1); 1875 if (err < 0) 1876 return err; 1877 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS, 1878 snd_pcm_hw_rule_div, NULL, 1879 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1); 1880 if (err < 0) 1881 return err; 1882 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1883 snd_pcm_hw_rule_div, NULL, 1884 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1885 if (err < 0) 1886 return err; 1887 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1888 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1889 SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1890 if (err < 0) 1891 return err; 1892 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 1893 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1894 SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1895 if (err < 0) 1896 return err; 1897 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1898 snd_pcm_hw_rule_mul, NULL, 1899 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1); 1900 if (err < 0) 1901 return err; 1902 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1903 snd_pcm_hw_rule_mulkdiv, (void*) 8, 1904 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1905 if (err < 0) 1906 return err; 1907 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1908 snd_pcm_hw_rule_muldivk, (void*) 1000000, 1909 SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1); 1910 if (err < 0) 1911 return err; 1912 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1913 snd_pcm_hw_rule_muldivk, (void*) 8, 1914 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1915 if (err < 0) 1916 return err; 1917 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1918 snd_pcm_hw_rule_muldivk, (void*) 8, 1919 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1); 1920 if (err < 0) 1921 return err; 1922 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1923 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1924 SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1925 if (err < 0) 1926 return err; 1927 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME, 1928 snd_pcm_hw_rule_mulkdiv, (void*) 1000000, 1929 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1); 1930 if (err < 0) 1931 return err; 1932 return 0; 1933 } 1934 1935 int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream) 1936 { 1937 struct snd_pcm_runtime *runtime = substream->runtime; 1938 struct snd_pcm_hardware *hw = &runtime->hw; 1939 int err; 1940 unsigned int mask = 0; 1941 1942 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1943 mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED; 1944 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1945 mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED; 1946 if (hw->info & SNDRV_PCM_INFO_MMAP) { 1947 if (hw->info & SNDRV_PCM_INFO_INTERLEAVED) 1948 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED; 1949 if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED) 1950 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED; 1951 if (hw->info & SNDRV_PCM_INFO_COMPLEX) 1952 mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX; 1953 } 1954 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask); 1955 snd_assert(err >= 0, return -EINVAL); 1956 1957 err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats); 1958 snd_assert(err >= 0, return -EINVAL); 1959 1960 err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD); 1961 snd_assert(err >= 0, return -EINVAL); 1962 1963 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 1964 hw->channels_min, hw->channels_max); 1965 snd_assert(err >= 0, return -EINVAL); 1966 1967 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE, 1968 hw->rate_min, hw->rate_max); 1969 snd_assert(err >= 0, return -EINVAL); 1970 1971 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, 1972 hw->period_bytes_min, hw->period_bytes_max); 1973 snd_assert(err >= 0, return -EINVAL); 1974 1975 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS, 1976 hw->periods_min, hw->periods_max); 1977 snd_assert(err >= 0, return -EINVAL); 1978 1979 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1980 hw->period_bytes_min, hw->buffer_bytes_max); 1981 snd_assert(err >= 0, return -EINVAL); 1982 1983 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 1984 snd_pcm_hw_rule_buffer_bytes_max, substream, 1985 SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1); 1986 if (err < 0) 1987 return err; 1988 1989 /* FIXME: remove */ 1990 if (runtime->dma_bytes) { 1991 err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes); 1992 snd_assert(err >= 0, return -EINVAL); 1993 } 1994 1995 if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) { 1996 err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE, 1997 snd_pcm_hw_rule_rate, hw, 1998 SNDRV_PCM_HW_PARAM_RATE, -1); 1999 if (err < 0) 2000 return err; 2001 } 2002 2003 /* FIXME: this belong to lowlevel */ 2004 snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_TICK_TIME, 2005 1000000 / HZ, 1000000 / HZ); 2006 snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE); 2007 2008 return 0; 2009 } 2010 2011 static void pcm_release_private(struct snd_pcm_substream *substream) 2012 { 2013 snd_pcm_unlink(substream); 2014 } 2015 2016 void snd_pcm_release_substream(struct snd_pcm_substream *substream) 2017 { 2018 substream->ref_count--; 2019 if (substream->ref_count > 0) 2020 return; 2021 2022 snd_pcm_drop(substream); 2023 if (substream->hw_opened) { 2024 if (substream->ops->hw_free != NULL) 2025 substream->ops->hw_free(substream); 2026 substream->ops->close(substream); 2027 substream->hw_opened = 0; 2028 } 2029 if (substream->pcm_release) { 2030 substream->pcm_release(substream); 2031 substream->pcm_release = NULL; 2032 } 2033 snd_pcm_detach_substream(substream); 2034 } 2035 2036 EXPORT_SYMBOL(snd_pcm_release_substream); 2037 2038 int snd_pcm_open_substream(struct snd_pcm *pcm, int stream, 2039 struct file *file, 2040 struct snd_pcm_substream **rsubstream) 2041 { 2042 struct snd_pcm_substream *substream; 2043 int err; 2044 2045 err = snd_pcm_attach_substream(pcm, stream, file, &substream); 2046 if (err < 0) 2047 return err; 2048 if (substream->ref_count > 1) { 2049 *rsubstream = substream; 2050 return 0; 2051 } 2052 2053 err = snd_pcm_hw_constraints_init(substream); 2054 if (err < 0) { 2055 snd_printd("snd_pcm_hw_constraints_init failed\n"); 2056 goto error; 2057 } 2058 2059 if ((err = substream->ops->open(substream)) < 0) 2060 goto error; 2061 2062 substream->hw_opened = 1; 2063 2064 err = snd_pcm_hw_constraints_complete(substream); 2065 if (err < 0) { 2066 snd_printd("snd_pcm_hw_constraints_complete failed\n"); 2067 goto error; 2068 } 2069 2070 *rsubstream = substream; 2071 return 0; 2072 2073 error: 2074 snd_pcm_release_substream(substream); 2075 return err; 2076 } 2077 2078 EXPORT_SYMBOL(snd_pcm_open_substream); 2079 2080 static int snd_pcm_open_file(struct file *file, 2081 struct snd_pcm *pcm, 2082 int stream, 2083 struct snd_pcm_file **rpcm_file) 2084 { 2085 struct snd_pcm_file *pcm_file; 2086 struct snd_pcm_substream *substream; 2087 struct snd_pcm_str *str; 2088 int err; 2089 2090 snd_assert(rpcm_file != NULL, return -EINVAL); 2091 *rpcm_file = NULL; 2092 2093 err = snd_pcm_open_substream(pcm, stream, file, &substream); 2094 if (err < 0) 2095 return err; 2096 2097 pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL); 2098 if (pcm_file == NULL) { 2099 snd_pcm_release_substream(substream); 2100 return -ENOMEM; 2101 } 2102 pcm_file->substream = substream; 2103 if (substream->ref_count == 1) { 2104 str = substream->pstr; 2105 substream->file = pcm_file; 2106 substream->pcm_release = pcm_release_private; 2107 } 2108 file->private_data = pcm_file; 2109 *rpcm_file = pcm_file; 2110 return 0; 2111 } 2112 2113 static int snd_pcm_playback_open(struct inode *inode, struct file *file) 2114 { 2115 struct snd_pcm *pcm; 2116 2117 pcm = snd_lookup_minor_data(iminor(inode), 2118 SNDRV_DEVICE_TYPE_PCM_PLAYBACK); 2119 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK); 2120 } 2121 2122 static int snd_pcm_capture_open(struct inode *inode, struct file *file) 2123 { 2124 struct snd_pcm *pcm; 2125 2126 pcm = snd_lookup_minor_data(iminor(inode), 2127 SNDRV_DEVICE_TYPE_PCM_CAPTURE); 2128 return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE); 2129 } 2130 2131 static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream) 2132 { 2133 int err; 2134 struct snd_pcm_file *pcm_file; 2135 wait_queue_t wait; 2136 2137 if (pcm == NULL) { 2138 err = -ENODEV; 2139 goto __error1; 2140 } 2141 err = snd_card_file_add(pcm->card, file); 2142 if (err < 0) 2143 goto __error1; 2144 if (!try_module_get(pcm->card->module)) { 2145 err = -EFAULT; 2146 goto __error2; 2147 } 2148 init_waitqueue_entry(&wait, current); 2149 add_wait_queue(&pcm->open_wait, &wait); 2150 mutex_lock(&pcm->open_mutex); 2151 while (1) { 2152 err = snd_pcm_open_file(file, pcm, stream, &pcm_file); 2153 if (err >= 0) 2154 break; 2155 if (err == -EAGAIN) { 2156 if (file->f_flags & O_NONBLOCK) { 2157 err = -EBUSY; 2158 break; 2159 } 2160 } else 2161 break; 2162 set_current_state(TASK_INTERRUPTIBLE); 2163 mutex_unlock(&pcm->open_mutex); 2164 schedule(); 2165 mutex_lock(&pcm->open_mutex); 2166 if (signal_pending(current)) { 2167 err = -ERESTARTSYS; 2168 break; 2169 } 2170 } 2171 remove_wait_queue(&pcm->open_wait, &wait); 2172 mutex_unlock(&pcm->open_mutex); 2173 if (err < 0) 2174 goto __error; 2175 return err; 2176 2177 __error: 2178 module_put(pcm->card->module); 2179 __error2: 2180 snd_card_file_remove(pcm->card, file); 2181 __error1: 2182 return err; 2183 } 2184 2185 static int snd_pcm_release(struct inode *inode, struct file *file) 2186 { 2187 struct snd_pcm *pcm; 2188 struct snd_pcm_substream *substream; 2189 struct snd_pcm_file *pcm_file; 2190 2191 pcm_file = file->private_data; 2192 substream = pcm_file->substream; 2193 snd_assert(substream != NULL, return -ENXIO); 2194 pcm = substream->pcm; 2195 fasync_helper(-1, file, 0, &substream->runtime->fasync); 2196 mutex_lock(&pcm->open_mutex); 2197 snd_pcm_release_substream(substream); 2198 kfree(pcm_file); 2199 mutex_unlock(&pcm->open_mutex); 2200 wake_up(&pcm->open_wait); 2201 module_put(pcm->card->module); 2202 snd_card_file_remove(pcm->card, file); 2203 return 0; 2204 } 2205 2206 static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream, 2207 snd_pcm_uframes_t frames) 2208 { 2209 struct snd_pcm_runtime *runtime = substream->runtime; 2210 snd_pcm_sframes_t appl_ptr; 2211 snd_pcm_sframes_t ret; 2212 snd_pcm_sframes_t hw_avail; 2213 2214 if (frames == 0) 2215 return 0; 2216 2217 snd_pcm_stream_lock_irq(substream); 2218 switch (runtime->status->state) { 2219 case SNDRV_PCM_STATE_PREPARED: 2220 break; 2221 case SNDRV_PCM_STATE_DRAINING: 2222 case SNDRV_PCM_STATE_RUNNING: 2223 if (snd_pcm_update_hw_ptr(substream) >= 0) 2224 break; 2225 /* Fall through */ 2226 case SNDRV_PCM_STATE_XRUN: 2227 ret = -EPIPE; 2228 goto __end; 2229 default: 2230 ret = -EBADFD; 2231 goto __end; 2232 } 2233 2234 hw_avail = snd_pcm_playback_hw_avail(runtime); 2235 if (hw_avail <= 0) { 2236 ret = 0; 2237 goto __end; 2238 } 2239 if (frames > (snd_pcm_uframes_t)hw_avail) 2240 frames = hw_avail; 2241 else 2242 frames -= frames % runtime->xfer_align; 2243 appl_ptr = runtime->control->appl_ptr - frames; 2244 if (appl_ptr < 0) 2245 appl_ptr += runtime->boundary; 2246 runtime->control->appl_ptr = appl_ptr; 2247 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING && 2248 runtime->sleep_min) 2249 snd_pcm_tick_prepare(substream); 2250 ret = frames; 2251 __end: 2252 snd_pcm_stream_unlock_irq(substream); 2253 return ret; 2254 } 2255 2256 static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream, 2257 snd_pcm_uframes_t frames) 2258 { 2259 struct snd_pcm_runtime *runtime = substream->runtime; 2260 snd_pcm_sframes_t appl_ptr; 2261 snd_pcm_sframes_t ret; 2262 snd_pcm_sframes_t hw_avail; 2263 2264 if (frames == 0) 2265 return 0; 2266 2267 snd_pcm_stream_lock_irq(substream); 2268 switch (runtime->status->state) { 2269 case SNDRV_PCM_STATE_PREPARED: 2270 case SNDRV_PCM_STATE_DRAINING: 2271 break; 2272 case SNDRV_PCM_STATE_RUNNING: 2273 if (snd_pcm_update_hw_ptr(substream) >= 0) 2274 break; 2275 /* Fall through */ 2276 case SNDRV_PCM_STATE_XRUN: 2277 ret = -EPIPE; 2278 goto __end; 2279 default: 2280 ret = -EBADFD; 2281 goto __end; 2282 } 2283 2284 hw_avail = snd_pcm_capture_hw_avail(runtime); 2285 if (hw_avail <= 0) { 2286 ret = 0; 2287 goto __end; 2288 } 2289 if (frames > (snd_pcm_uframes_t)hw_avail) 2290 frames = hw_avail; 2291 else 2292 frames -= frames % runtime->xfer_align; 2293 appl_ptr = runtime->control->appl_ptr - frames; 2294 if (appl_ptr < 0) 2295 appl_ptr += runtime->boundary; 2296 runtime->control->appl_ptr = appl_ptr; 2297 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING && 2298 runtime->sleep_min) 2299 snd_pcm_tick_prepare(substream); 2300 ret = frames; 2301 __end: 2302 snd_pcm_stream_unlock_irq(substream); 2303 return ret; 2304 } 2305 2306 static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream, 2307 snd_pcm_uframes_t frames) 2308 { 2309 struct snd_pcm_runtime *runtime = substream->runtime; 2310 snd_pcm_sframes_t appl_ptr; 2311 snd_pcm_sframes_t ret; 2312 snd_pcm_sframes_t avail; 2313 2314 if (frames == 0) 2315 return 0; 2316 2317 snd_pcm_stream_lock_irq(substream); 2318 switch (runtime->status->state) { 2319 case SNDRV_PCM_STATE_PREPARED: 2320 case SNDRV_PCM_STATE_PAUSED: 2321 break; 2322 case SNDRV_PCM_STATE_DRAINING: 2323 case SNDRV_PCM_STATE_RUNNING: 2324 if (snd_pcm_update_hw_ptr(substream) >= 0) 2325 break; 2326 /* Fall through */ 2327 case SNDRV_PCM_STATE_XRUN: 2328 ret = -EPIPE; 2329 goto __end; 2330 default: 2331 ret = -EBADFD; 2332 goto __end; 2333 } 2334 2335 avail = snd_pcm_playback_avail(runtime); 2336 if (avail <= 0) { 2337 ret = 0; 2338 goto __end; 2339 } 2340 if (frames > (snd_pcm_uframes_t)avail) 2341 frames = avail; 2342 else 2343 frames -= frames % runtime->xfer_align; 2344 appl_ptr = runtime->control->appl_ptr + frames; 2345 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2346 appl_ptr -= runtime->boundary; 2347 runtime->control->appl_ptr = appl_ptr; 2348 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING && 2349 runtime->sleep_min) 2350 snd_pcm_tick_prepare(substream); 2351 ret = frames; 2352 __end: 2353 snd_pcm_stream_unlock_irq(substream); 2354 return ret; 2355 } 2356 2357 static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream, 2358 snd_pcm_uframes_t frames) 2359 { 2360 struct snd_pcm_runtime *runtime = substream->runtime; 2361 snd_pcm_sframes_t appl_ptr; 2362 snd_pcm_sframes_t ret; 2363 snd_pcm_sframes_t avail; 2364 2365 if (frames == 0) 2366 return 0; 2367 2368 snd_pcm_stream_lock_irq(substream); 2369 switch (runtime->status->state) { 2370 case SNDRV_PCM_STATE_PREPARED: 2371 case SNDRV_PCM_STATE_DRAINING: 2372 case SNDRV_PCM_STATE_PAUSED: 2373 break; 2374 case SNDRV_PCM_STATE_RUNNING: 2375 if (snd_pcm_update_hw_ptr(substream) >= 0) 2376 break; 2377 /* Fall through */ 2378 case SNDRV_PCM_STATE_XRUN: 2379 ret = -EPIPE; 2380 goto __end; 2381 default: 2382 ret = -EBADFD; 2383 goto __end; 2384 } 2385 2386 avail = snd_pcm_capture_avail(runtime); 2387 if (avail <= 0) { 2388 ret = 0; 2389 goto __end; 2390 } 2391 if (frames > (snd_pcm_uframes_t)avail) 2392 frames = avail; 2393 else 2394 frames -= frames % runtime->xfer_align; 2395 appl_ptr = runtime->control->appl_ptr + frames; 2396 if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary) 2397 appl_ptr -= runtime->boundary; 2398 runtime->control->appl_ptr = appl_ptr; 2399 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING && 2400 runtime->sleep_min) 2401 snd_pcm_tick_prepare(substream); 2402 ret = frames; 2403 __end: 2404 snd_pcm_stream_unlock_irq(substream); 2405 return ret; 2406 } 2407 2408 static int snd_pcm_hwsync(struct snd_pcm_substream *substream) 2409 { 2410 struct snd_pcm_runtime *runtime = substream->runtime; 2411 int err; 2412 2413 snd_pcm_stream_lock_irq(substream); 2414 switch (runtime->status->state) { 2415 case SNDRV_PCM_STATE_DRAINING: 2416 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2417 goto __badfd; 2418 case SNDRV_PCM_STATE_RUNNING: 2419 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2420 break; 2421 /* Fall through */ 2422 case SNDRV_PCM_STATE_PREPARED: 2423 case SNDRV_PCM_STATE_SUSPENDED: 2424 err = 0; 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 return err; 2436 } 2437 2438 static int snd_pcm_delay(struct snd_pcm_substream *substream, 2439 snd_pcm_sframes_t __user *res) 2440 { 2441 struct snd_pcm_runtime *runtime = substream->runtime; 2442 int err; 2443 snd_pcm_sframes_t n = 0; 2444 2445 snd_pcm_stream_lock_irq(substream); 2446 switch (runtime->status->state) { 2447 case SNDRV_PCM_STATE_DRAINING: 2448 if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) 2449 goto __badfd; 2450 case SNDRV_PCM_STATE_RUNNING: 2451 if ((err = snd_pcm_update_hw_ptr(substream)) < 0) 2452 break; 2453 /* Fall through */ 2454 case SNDRV_PCM_STATE_PREPARED: 2455 case SNDRV_PCM_STATE_SUSPENDED: 2456 err = 0; 2457 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 2458 n = snd_pcm_playback_hw_avail(runtime); 2459 else 2460 n = snd_pcm_capture_avail(runtime); 2461 break; 2462 case SNDRV_PCM_STATE_XRUN: 2463 err = -EPIPE; 2464 break; 2465 default: 2466 __badfd: 2467 err = -EBADFD; 2468 break; 2469 } 2470 snd_pcm_stream_unlock_irq(substream); 2471 if (!err) 2472 if (put_user(n, res)) 2473 err = -EFAULT; 2474 return err; 2475 } 2476 2477 static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream, 2478 struct snd_pcm_sync_ptr __user *_sync_ptr) 2479 { 2480 struct snd_pcm_runtime *runtime = substream->runtime; 2481 struct snd_pcm_sync_ptr sync_ptr; 2482 volatile struct snd_pcm_mmap_status *status; 2483 volatile struct snd_pcm_mmap_control *control; 2484 int err; 2485 2486 memset(&sync_ptr, 0, sizeof(sync_ptr)); 2487 if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags))) 2488 return -EFAULT; 2489 if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control))) 2490 return -EFAULT; 2491 status = runtime->status; 2492 control = runtime->control; 2493 if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) { 2494 err = snd_pcm_hwsync(substream); 2495 if (err < 0) 2496 return err; 2497 } 2498 snd_pcm_stream_lock_irq(substream); 2499 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL)) 2500 control->appl_ptr = sync_ptr.c.control.appl_ptr; 2501 else 2502 sync_ptr.c.control.appl_ptr = control->appl_ptr; 2503 if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN)) 2504 control->avail_min = sync_ptr.c.control.avail_min; 2505 else 2506 sync_ptr.c.control.avail_min = control->avail_min; 2507 sync_ptr.s.status.state = status->state; 2508 sync_ptr.s.status.hw_ptr = status->hw_ptr; 2509 sync_ptr.s.status.tstamp = status->tstamp; 2510 sync_ptr.s.status.suspended_state = status->suspended_state; 2511 snd_pcm_stream_unlock_irq(substream); 2512 if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr))) 2513 return -EFAULT; 2514 return 0; 2515 } 2516 2517 static int snd_pcm_common_ioctl1(struct file *file, 2518 struct snd_pcm_substream *substream, 2519 unsigned int cmd, void __user *arg) 2520 { 2521 snd_assert(substream != NULL, return -ENXIO); 2522 2523 switch (cmd) { 2524 case SNDRV_PCM_IOCTL_PVERSION: 2525 return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0; 2526 case SNDRV_PCM_IOCTL_INFO: 2527 return snd_pcm_info_user(substream, arg); 2528 case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */ 2529 return 0; 2530 case SNDRV_PCM_IOCTL_HW_REFINE: 2531 return snd_pcm_hw_refine_user(substream, arg); 2532 case SNDRV_PCM_IOCTL_HW_PARAMS: 2533 return snd_pcm_hw_params_user(substream, arg); 2534 case SNDRV_PCM_IOCTL_HW_FREE: 2535 return snd_pcm_hw_free(substream); 2536 case SNDRV_PCM_IOCTL_SW_PARAMS: 2537 return snd_pcm_sw_params_user(substream, arg); 2538 case SNDRV_PCM_IOCTL_STATUS: 2539 return snd_pcm_status_user(substream, arg); 2540 case SNDRV_PCM_IOCTL_CHANNEL_INFO: 2541 return snd_pcm_channel_info_user(substream, arg); 2542 case SNDRV_PCM_IOCTL_PREPARE: 2543 return snd_pcm_prepare(substream, file); 2544 case SNDRV_PCM_IOCTL_RESET: 2545 return snd_pcm_reset(substream); 2546 case SNDRV_PCM_IOCTL_START: 2547 return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING); 2548 case SNDRV_PCM_IOCTL_LINK: 2549 return snd_pcm_link(substream, (int)(unsigned long) arg); 2550 case SNDRV_PCM_IOCTL_UNLINK: 2551 return snd_pcm_unlink(substream); 2552 case SNDRV_PCM_IOCTL_RESUME: 2553 return snd_pcm_resume(substream); 2554 case SNDRV_PCM_IOCTL_XRUN: 2555 return snd_pcm_xrun(substream); 2556 case SNDRV_PCM_IOCTL_HWSYNC: 2557 return snd_pcm_hwsync(substream); 2558 case SNDRV_PCM_IOCTL_DELAY: 2559 return snd_pcm_delay(substream, arg); 2560 case SNDRV_PCM_IOCTL_SYNC_PTR: 2561 return snd_pcm_sync_ptr(substream, arg); 2562 #ifdef CONFIG_SND_SUPPORT_OLD_API 2563 case SNDRV_PCM_IOCTL_HW_REFINE_OLD: 2564 return snd_pcm_hw_refine_old_user(substream, arg); 2565 case SNDRV_PCM_IOCTL_HW_PARAMS_OLD: 2566 return snd_pcm_hw_params_old_user(substream, arg); 2567 #endif 2568 case SNDRV_PCM_IOCTL_DRAIN: 2569 return snd_pcm_drain(substream); 2570 case SNDRV_PCM_IOCTL_DROP: 2571 return snd_pcm_drop(substream); 2572 case SNDRV_PCM_IOCTL_PAUSE: 2573 { 2574 int res; 2575 snd_pcm_stream_lock_irq(substream); 2576 res = snd_pcm_pause(substream, (int)(unsigned long)arg); 2577 snd_pcm_stream_unlock_irq(substream); 2578 return res; 2579 } 2580 } 2581 snd_printd("unknown ioctl = 0x%x\n", cmd); 2582 return -ENOTTY; 2583 } 2584 2585 static int snd_pcm_playback_ioctl1(struct file *file, 2586 struct snd_pcm_substream *substream, 2587 unsigned int cmd, void __user *arg) 2588 { 2589 snd_assert(substream != NULL, return -ENXIO); 2590 snd_assert(substream->stream == SNDRV_PCM_STREAM_PLAYBACK, return -EINVAL); 2591 switch (cmd) { 2592 case SNDRV_PCM_IOCTL_WRITEI_FRAMES: 2593 { 2594 struct snd_xferi xferi; 2595 struct snd_xferi __user *_xferi = arg; 2596 struct snd_pcm_runtime *runtime = substream->runtime; 2597 snd_pcm_sframes_t result; 2598 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2599 return -EBADFD; 2600 if (put_user(0, &_xferi->result)) 2601 return -EFAULT; 2602 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2603 return -EFAULT; 2604 result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames); 2605 __put_user(result, &_xferi->result); 2606 return result < 0 ? result : 0; 2607 } 2608 case SNDRV_PCM_IOCTL_WRITEN_FRAMES: 2609 { 2610 struct snd_xfern xfern; 2611 struct snd_xfern __user *_xfern = arg; 2612 struct snd_pcm_runtime *runtime = substream->runtime; 2613 void __user **bufs; 2614 snd_pcm_sframes_t result; 2615 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2616 return -EBADFD; 2617 if (runtime->channels > 128) 2618 return -EINVAL; 2619 if (put_user(0, &_xfern->result)) 2620 return -EFAULT; 2621 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2622 return -EFAULT; 2623 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL); 2624 if (bufs == NULL) 2625 return -ENOMEM; 2626 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) { 2627 kfree(bufs); 2628 return -EFAULT; 2629 } 2630 result = snd_pcm_lib_writev(substream, bufs, xfern.frames); 2631 kfree(bufs); 2632 __put_user(result, &_xfern->result); 2633 return result < 0 ? result : 0; 2634 } 2635 case SNDRV_PCM_IOCTL_REWIND: 2636 { 2637 snd_pcm_uframes_t frames; 2638 snd_pcm_uframes_t __user *_frames = arg; 2639 snd_pcm_sframes_t result; 2640 if (get_user(frames, _frames)) 2641 return -EFAULT; 2642 if (put_user(0, _frames)) 2643 return -EFAULT; 2644 result = snd_pcm_playback_rewind(substream, frames); 2645 __put_user(result, _frames); 2646 return result < 0 ? result : 0; 2647 } 2648 case SNDRV_PCM_IOCTL_FORWARD: 2649 { 2650 snd_pcm_uframes_t frames; 2651 snd_pcm_uframes_t __user *_frames = arg; 2652 snd_pcm_sframes_t result; 2653 if (get_user(frames, _frames)) 2654 return -EFAULT; 2655 if (put_user(0, _frames)) 2656 return -EFAULT; 2657 result = snd_pcm_playback_forward(substream, frames); 2658 __put_user(result, _frames); 2659 return result < 0 ? result : 0; 2660 } 2661 } 2662 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2663 } 2664 2665 static int snd_pcm_capture_ioctl1(struct file *file, 2666 struct snd_pcm_substream *substream, 2667 unsigned int cmd, void __user *arg) 2668 { 2669 snd_assert(substream != NULL, return -ENXIO); 2670 snd_assert(substream->stream == SNDRV_PCM_STREAM_CAPTURE, return -EINVAL); 2671 switch (cmd) { 2672 case SNDRV_PCM_IOCTL_READI_FRAMES: 2673 { 2674 struct snd_xferi xferi; 2675 struct snd_xferi __user *_xferi = arg; 2676 struct snd_pcm_runtime *runtime = substream->runtime; 2677 snd_pcm_sframes_t result; 2678 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2679 return -EBADFD; 2680 if (put_user(0, &_xferi->result)) 2681 return -EFAULT; 2682 if (copy_from_user(&xferi, _xferi, sizeof(xferi))) 2683 return -EFAULT; 2684 result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames); 2685 __put_user(result, &_xferi->result); 2686 return result < 0 ? result : 0; 2687 } 2688 case SNDRV_PCM_IOCTL_READN_FRAMES: 2689 { 2690 struct snd_xfern xfern; 2691 struct snd_xfern __user *_xfern = arg; 2692 struct snd_pcm_runtime *runtime = substream->runtime; 2693 void *bufs; 2694 snd_pcm_sframes_t result; 2695 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2696 return -EBADFD; 2697 if (runtime->channels > 128) 2698 return -EINVAL; 2699 if (put_user(0, &_xfern->result)) 2700 return -EFAULT; 2701 if (copy_from_user(&xfern, _xfern, sizeof(xfern))) 2702 return -EFAULT; 2703 bufs = kmalloc(sizeof(void *) * runtime->channels, GFP_KERNEL); 2704 if (bufs == NULL) 2705 return -ENOMEM; 2706 if (copy_from_user(bufs, xfern.bufs, sizeof(void *) * runtime->channels)) { 2707 kfree(bufs); 2708 return -EFAULT; 2709 } 2710 result = snd_pcm_lib_readv(substream, bufs, xfern.frames); 2711 kfree(bufs); 2712 __put_user(result, &_xfern->result); 2713 return result < 0 ? result : 0; 2714 } 2715 case SNDRV_PCM_IOCTL_REWIND: 2716 { 2717 snd_pcm_uframes_t frames; 2718 snd_pcm_uframes_t __user *_frames = arg; 2719 snd_pcm_sframes_t result; 2720 if (get_user(frames, _frames)) 2721 return -EFAULT; 2722 if (put_user(0, _frames)) 2723 return -EFAULT; 2724 result = snd_pcm_capture_rewind(substream, frames); 2725 __put_user(result, _frames); 2726 return result < 0 ? result : 0; 2727 } 2728 case SNDRV_PCM_IOCTL_FORWARD: 2729 { 2730 snd_pcm_uframes_t frames; 2731 snd_pcm_uframes_t __user *_frames = arg; 2732 snd_pcm_sframes_t result; 2733 if (get_user(frames, _frames)) 2734 return -EFAULT; 2735 if (put_user(0, _frames)) 2736 return -EFAULT; 2737 result = snd_pcm_capture_forward(substream, frames); 2738 __put_user(result, _frames); 2739 return result < 0 ? result : 0; 2740 } 2741 } 2742 return snd_pcm_common_ioctl1(file, substream, cmd, arg); 2743 } 2744 2745 static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd, 2746 unsigned long arg) 2747 { 2748 struct snd_pcm_file *pcm_file; 2749 2750 pcm_file = file->private_data; 2751 2752 if (((cmd >> 8) & 0xff) != 'A') 2753 return -ENOTTY; 2754 2755 return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd, 2756 (void __user *)arg); 2757 } 2758 2759 static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd, 2760 unsigned long arg) 2761 { 2762 struct snd_pcm_file *pcm_file; 2763 2764 pcm_file = file->private_data; 2765 2766 if (((cmd >> 8) & 0xff) != 'A') 2767 return -ENOTTY; 2768 2769 return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd, 2770 (void __user *)arg); 2771 } 2772 2773 int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream, 2774 unsigned int cmd, void *arg) 2775 { 2776 mm_segment_t fs; 2777 int result; 2778 2779 fs = snd_enter_user(); 2780 switch (substream->stream) { 2781 case SNDRV_PCM_STREAM_PLAYBACK: 2782 result = snd_pcm_playback_ioctl1(NULL, substream, cmd, 2783 (void __user *)arg); 2784 break; 2785 case SNDRV_PCM_STREAM_CAPTURE: 2786 result = snd_pcm_capture_ioctl1(NULL, substream, cmd, 2787 (void __user *)arg); 2788 break; 2789 default: 2790 result = -EINVAL; 2791 break; 2792 } 2793 snd_leave_user(fs); 2794 return result; 2795 } 2796 2797 EXPORT_SYMBOL(snd_pcm_kernel_ioctl); 2798 2799 static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count, 2800 loff_t * offset) 2801 { 2802 struct snd_pcm_file *pcm_file; 2803 struct snd_pcm_substream *substream; 2804 struct snd_pcm_runtime *runtime; 2805 snd_pcm_sframes_t result; 2806 2807 pcm_file = file->private_data; 2808 substream = pcm_file->substream; 2809 snd_assert(substream != NULL, return -ENXIO); 2810 runtime = substream->runtime; 2811 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2812 return -EBADFD; 2813 if (!frame_aligned(runtime, count)) 2814 return -EINVAL; 2815 count = bytes_to_frames(runtime, count); 2816 result = snd_pcm_lib_read(substream, buf, count); 2817 if (result > 0) 2818 result = frames_to_bytes(runtime, result); 2819 return result; 2820 } 2821 2822 static ssize_t snd_pcm_write(struct file *file, const char __user *buf, 2823 size_t count, loff_t * offset) 2824 { 2825 struct snd_pcm_file *pcm_file; 2826 struct snd_pcm_substream *substream; 2827 struct snd_pcm_runtime *runtime; 2828 snd_pcm_sframes_t result; 2829 2830 pcm_file = file->private_data; 2831 substream = pcm_file->substream; 2832 snd_assert(substream != NULL, result = -ENXIO; goto end); 2833 runtime = substream->runtime; 2834 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 2835 result = -EBADFD; 2836 goto end; 2837 } 2838 if (!frame_aligned(runtime, count)) { 2839 result = -EINVAL; 2840 goto end; 2841 } 2842 count = bytes_to_frames(runtime, count); 2843 result = snd_pcm_lib_write(substream, buf, count); 2844 if (result > 0) 2845 result = frames_to_bytes(runtime, result); 2846 end: 2847 return result; 2848 } 2849 2850 static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov, 2851 unsigned long nr_segs, loff_t pos) 2852 2853 { 2854 struct snd_pcm_file *pcm_file; 2855 struct snd_pcm_substream *substream; 2856 struct snd_pcm_runtime *runtime; 2857 snd_pcm_sframes_t result; 2858 unsigned long i; 2859 void __user **bufs; 2860 snd_pcm_uframes_t frames; 2861 2862 pcm_file = iocb->ki_filp->private_data; 2863 substream = pcm_file->substream; 2864 snd_assert(substream != NULL, return -ENXIO); 2865 runtime = substream->runtime; 2866 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2867 return -EBADFD; 2868 if (nr_segs > 1024 || nr_segs != runtime->channels) 2869 return -EINVAL; 2870 if (!frame_aligned(runtime, iov->iov_len)) 2871 return -EINVAL; 2872 frames = bytes_to_samples(runtime, iov->iov_len); 2873 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2874 if (bufs == NULL) 2875 return -ENOMEM; 2876 for (i = 0; i < nr_segs; ++i) 2877 bufs[i] = iov[i].iov_base; 2878 result = snd_pcm_lib_readv(substream, bufs, frames); 2879 if (result > 0) 2880 result = frames_to_bytes(runtime, result); 2881 kfree(bufs); 2882 return result; 2883 } 2884 2885 static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov, 2886 unsigned long nr_segs, loff_t pos) 2887 { 2888 struct snd_pcm_file *pcm_file; 2889 struct snd_pcm_substream *substream; 2890 struct snd_pcm_runtime *runtime; 2891 snd_pcm_sframes_t result; 2892 unsigned long i; 2893 void __user **bufs; 2894 snd_pcm_uframes_t frames; 2895 2896 pcm_file = iocb->ki_filp->private_data; 2897 substream = pcm_file->substream; 2898 snd_assert(substream != NULL, result = -ENXIO; goto end); 2899 runtime = substream->runtime; 2900 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) { 2901 result = -EBADFD; 2902 goto end; 2903 } 2904 if (nr_segs > 128 || nr_segs != runtime->channels || 2905 !frame_aligned(runtime, iov->iov_len)) { 2906 result = -EINVAL; 2907 goto end; 2908 } 2909 frames = bytes_to_samples(runtime, iov->iov_len); 2910 bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL); 2911 if (bufs == NULL) 2912 return -ENOMEM; 2913 for (i = 0; i < nr_segs; ++i) 2914 bufs[i] = iov[i].iov_base; 2915 result = snd_pcm_lib_writev(substream, bufs, frames); 2916 if (result > 0) 2917 result = frames_to_bytes(runtime, result); 2918 kfree(bufs); 2919 end: 2920 return result; 2921 } 2922 2923 static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait) 2924 { 2925 struct snd_pcm_file *pcm_file; 2926 struct snd_pcm_substream *substream; 2927 struct snd_pcm_runtime *runtime; 2928 unsigned int mask; 2929 snd_pcm_uframes_t avail; 2930 2931 pcm_file = file->private_data; 2932 2933 substream = pcm_file->substream; 2934 snd_assert(substream != NULL, return -ENXIO); 2935 runtime = substream->runtime; 2936 2937 poll_wait(file, &runtime->sleep, wait); 2938 2939 snd_pcm_stream_lock_irq(substream); 2940 avail = snd_pcm_playback_avail(runtime); 2941 switch (runtime->status->state) { 2942 case SNDRV_PCM_STATE_RUNNING: 2943 case SNDRV_PCM_STATE_PREPARED: 2944 case SNDRV_PCM_STATE_PAUSED: 2945 if (avail >= runtime->control->avail_min) { 2946 mask = POLLOUT | POLLWRNORM; 2947 break; 2948 } 2949 /* Fall through */ 2950 case SNDRV_PCM_STATE_DRAINING: 2951 mask = 0; 2952 break; 2953 default: 2954 mask = POLLOUT | POLLWRNORM | POLLERR; 2955 break; 2956 } 2957 snd_pcm_stream_unlock_irq(substream); 2958 return mask; 2959 } 2960 2961 static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait) 2962 { 2963 struct snd_pcm_file *pcm_file; 2964 struct snd_pcm_substream *substream; 2965 struct snd_pcm_runtime *runtime; 2966 unsigned int mask; 2967 snd_pcm_uframes_t avail; 2968 2969 pcm_file = file->private_data; 2970 2971 substream = pcm_file->substream; 2972 snd_assert(substream != NULL, return -ENXIO); 2973 runtime = substream->runtime; 2974 2975 poll_wait(file, &runtime->sleep, wait); 2976 2977 snd_pcm_stream_lock_irq(substream); 2978 avail = snd_pcm_capture_avail(runtime); 2979 switch (runtime->status->state) { 2980 case SNDRV_PCM_STATE_RUNNING: 2981 case SNDRV_PCM_STATE_PREPARED: 2982 case SNDRV_PCM_STATE_PAUSED: 2983 if (avail >= runtime->control->avail_min) { 2984 mask = POLLIN | POLLRDNORM; 2985 break; 2986 } 2987 mask = 0; 2988 break; 2989 case SNDRV_PCM_STATE_DRAINING: 2990 if (avail > 0) { 2991 mask = POLLIN | POLLRDNORM; 2992 break; 2993 } 2994 /* Fall through */ 2995 default: 2996 mask = POLLIN | POLLRDNORM | POLLERR; 2997 break; 2998 } 2999 snd_pcm_stream_unlock_irq(substream); 3000 return mask; 3001 } 3002 3003 /* 3004 * mmap support 3005 */ 3006 3007 /* 3008 * Only on coherent architectures, we can mmap the status and the control records 3009 * for effcient data transfer. On others, we have to use HWSYNC ioctl... 3010 */ 3011 #if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA) 3012 /* 3013 * mmap status record 3014 */ 3015 static struct page * snd_pcm_mmap_status_nopage(struct vm_area_struct *area, 3016 unsigned long address, int *type) 3017 { 3018 struct snd_pcm_substream *substream = area->vm_private_data; 3019 struct snd_pcm_runtime *runtime; 3020 struct page * page; 3021 3022 if (substream == NULL) 3023 return NOPAGE_SIGBUS; 3024 runtime = substream->runtime; 3025 page = virt_to_page(runtime->status); 3026 get_page(page); 3027 if (type) 3028 *type = VM_FAULT_MINOR; 3029 return page; 3030 } 3031 3032 static struct vm_operations_struct snd_pcm_vm_ops_status = 3033 { 3034 .nopage = snd_pcm_mmap_status_nopage, 3035 }; 3036 3037 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3038 struct vm_area_struct *area) 3039 { 3040 struct snd_pcm_runtime *runtime; 3041 long size; 3042 if (!(area->vm_flags & VM_READ)) 3043 return -EINVAL; 3044 runtime = substream->runtime; 3045 snd_assert(runtime != NULL, return -EAGAIN); 3046 size = area->vm_end - area->vm_start; 3047 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status))) 3048 return -EINVAL; 3049 area->vm_ops = &snd_pcm_vm_ops_status; 3050 area->vm_private_data = substream; 3051 area->vm_flags |= VM_RESERVED; 3052 return 0; 3053 } 3054 3055 /* 3056 * mmap control record 3057 */ 3058 static struct page * snd_pcm_mmap_control_nopage(struct vm_area_struct *area, 3059 unsigned long address, int *type) 3060 { 3061 struct snd_pcm_substream *substream = area->vm_private_data; 3062 struct snd_pcm_runtime *runtime; 3063 struct page * page; 3064 3065 if (substream == NULL) 3066 return NOPAGE_SIGBUS; 3067 runtime = substream->runtime; 3068 page = virt_to_page(runtime->control); 3069 get_page(page); 3070 if (type) 3071 *type = VM_FAULT_MINOR; 3072 return page; 3073 } 3074 3075 static struct vm_operations_struct snd_pcm_vm_ops_control = 3076 { 3077 .nopage = snd_pcm_mmap_control_nopage, 3078 }; 3079 3080 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3081 struct vm_area_struct *area) 3082 { 3083 struct snd_pcm_runtime *runtime; 3084 long size; 3085 if (!(area->vm_flags & VM_READ)) 3086 return -EINVAL; 3087 runtime = substream->runtime; 3088 snd_assert(runtime != NULL, return -EAGAIN); 3089 size = area->vm_end - area->vm_start; 3090 if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control))) 3091 return -EINVAL; 3092 area->vm_ops = &snd_pcm_vm_ops_control; 3093 area->vm_private_data = substream; 3094 area->vm_flags |= VM_RESERVED; 3095 return 0; 3096 } 3097 #else /* ! coherent mmap */ 3098 /* 3099 * don't support mmap for status and control records. 3100 */ 3101 static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file, 3102 struct vm_area_struct *area) 3103 { 3104 return -ENXIO; 3105 } 3106 static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file, 3107 struct vm_area_struct *area) 3108 { 3109 return -ENXIO; 3110 } 3111 #endif /* coherent mmap */ 3112 3113 /* 3114 * nopage callback for mmapping a RAM page 3115 */ 3116 static struct page *snd_pcm_mmap_data_nopage(struct vm_area_struct *area, 3117 unsigned long address, int *type) 3118 { 3119 struct snd_pcm_substream *substream = area->vm_private_data; 3120 struct snd_pcm_runtime *runtime; 3121 unsigned long offset; 3122 struct page * page; 3123 void *vaddr; 3124 size_t dma_bytes; 3125 3126 if (substream == NULL) 3127 return NOPAGE_SIGBUS; 3128 runtime = substream->runtime; 3129 offset = area->vm_pgoff << PAGE_SHIFT; 3130 offset += address - area->vm_start; 3131 snd_assert((offset % PAGE_SIZE) == 0, return NOPAGE_SIGBUS); 3132 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3133 if (offset > dma_bytes - PAGE_SIZE) 3134 return NOPAGE_SIGBUS; 3135 if (substream->ops->page) { 3136 page = substream->ops->page(substream, offset); 3137 if (! page) 3138 return NOPAGE_OOM; /* XXX: is this really due to OOM? */ 3139 } else { 3140 vaddr = runtime->dma_area + offset; 3141 page = virt_to_page(vaddr); 3142 } 3143 get_page(page); 3144 if (type) 3145 *type = VM_FAULT_MINOR; 3146 return page; 3147 } 3148 3149 static struct vm_operations_struct snd_pcm_vm_ops_data = 3150 { 3151 .open = snd_pcm_mmap_data_open, 3152 .close = snd_pcm_mmap_data_close, 3153 .nopage = snd_pcm_mmap_data_nopage, 3154 }; 3155 3156 /* 3157 * mmap the DMA buffer on RAM 3158 */ 3159 static int snd_pcm_default_mmap(struct snd_pcm_substream *substream, 3160 struct vm_area_struct *area) 3161 { 3162 area->vm_ops = &snd_pcm_vm_ops_data; 3163 area->vm_private_data = substream; 3164 area->vm_flags |= VM_RESERVED; 3165 atomic_inc(&substream->mmap_count); 3166 return 0; 3167 } 3168 3169 /* 3170 * mmap the DMA buffer on I/O memory area 3171 */ 3172 #if SNDRV_PCM_INFO_MMAP_IOMEM 3173 static struct vm_operations_struct snd_pcm_vm_ops_data_mmio = 3174 { 3175 .open = snd_pcm_mmap_data_open, 3176 .close = snd_pcm_mmap_data_close, 3177 }; 3178 3179 int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 3180 struct vm_area_struct *area) 3181 { 3182 long size; 3183 unsigned long offset; 3184 3185 #ifdef pgprot_noncached 3186 area->vm_page_prot = pgprot_noncached(area->vm_page_prot); 3187 #endif 3188 area->vm_ops = &snd_pcm_vm_ops_data_mmio; 3189 area->vm_private_data = substream; 3190 area->vm_flags |= VM_IO; 3191 size = area->vm_end - area->vm_start; 3192 offset = area->vm_pgoff << PAGE_SHIFT; 3193 if (io_remap_pfn_range(area, area->vm_start, 3194 (substream->runtime->dma_addr + offset) >> PAGE_SHIFT, 3195 size, area->vm_page_prot)) 3196 return -EAGAIN; 3197 atomic_inc(&substream->mmap_count); 3198 return 0; 3199 } 3200 3201 EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem); 3202 #endif /* SNDRV_PCM_INFO_MMAP */ 3203 3204 /* 3205 * mmap DMA buffer 3206 */ 3207 int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 3208 struct vm_area_struct *area) 3209 { 3210 struct snd_pcm_runtime *runtime; 3211 long size; 3212 unsigned long offset; 3213 size_t dma_bytes; 3214 3215 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { 3216 if (!(area->vm_flags & (VM_WRITE|VM_READ))) 3217 return -EINVAL; 3218 } else { 3219 if (!(area->vm_flags & VM_READ)) 3220 return -EINVAL; 3221 } 3222 runtime = substream->runtime; 3223 snd_assert(runtime != NULL, return -EAGAIN); 3224 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 3225 return -EBADFD; 3226 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) 3227 return -ENXIO; 3228 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 3229 runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 3230 return -EINVAL; 3231 size = area->vm_end - area->vm_start; 3232 offset = area->vm_pgoff << PAGE_SHIFT; 3233 dma_bytes = PAGE_ALIGN(runtime->dma_bytes); 3234 if ((size_t)size > dma_bytes) 3235 return -EINVAL; 3236 if (offset > dma_bytes - size) 3237 return -EINVAL; 3238 3239 if (substream->ops->mmap) 3240 return substream->ops->mmap(substream, area); 3241 else 3242 return snd_pcm_default_mmap(substream, area); 3243 } 3244 3245 EXPORT_SYMBOL(snd_pcm_mmap_data); 3246 3247 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area) 3248 { 3249 struct snd_pcm_file * pcm_file; 3250 struct snd_pcm_substream *substream; 3251 unsigned long offset; 3252 3253 pcm_file = file->private_data; 3254 substream = pcm_file->substream; 3255 snd_assert(substream != NULL, return -ENXIO); 3256 3257 offset = area->vm_pgoff << PAGE_SHIFT; 3258 switch (offset) { 3259 case SNDRV_PCM_MMAP_OFFSET_STATUS: 3260 if (pcm_file->no_compat_mmap) 3261 return -ENXIO; 3262 return snd_pcm_mmap_status(substream, file, area); 3263 case SNDRV_PCM_MMAP_OFFSET_CONTROL: 3264 if (pcm_file->no_compat_mmap) 3265 return -ENXIO; 3266 return snd_pcm_mmap_control(substream, file, area); 3267 default: 3268 return snd_pcm_mmap_data(substream, file, area); 3269 } 3270 return 0; 3271 } 3272 3273 static int snd_pcm_fasync(int fd, struct file * file, int on) 3274 { 3275 struct snd_pcm_file * pcm_file; 3276 struct snd_pcm_substream *substream; 3277 struct snd_pcm_runtime *runtime; 3278 int err; 3279 3280 pcm_file = file->private_data; 3281 substream = pcm_file->substream; 3282 snd_assert(substream != NULL, return -ENXIO); 3283 runtime = substream->runtime; 3284 3285 err = fasync_helper(fd, file, on, &runtime->fasync); 3286 if (err < 0) 3287 return err; 3288 return 0; 3289 } 3290 3291 /* 3292 * ioctl32 compat 3293 */ 3294 #ifdef CONFIG_COMPAT 3295 #include "pcm_compat.c" 3296 #else 3297 #define snd_pcm_ioctl_compat NULL 3298 #endif 3299 3300 /* 3301 * To be removed helpers to keep binary compatibility 3302 */ 3303 3304 #ifdef CONFIG_SND_SUPPORT_OLD_API 3305 #define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5)) 3306 #define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5)) 3307 3308 static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params, 3309 struct snd_pcm_hw_params_old *oparams) 3310 { 3311 unsigned int i; 3312 3313 memset(params, 0, sizeof(*params)); 3314 params->flags = oparams->flags; 3315 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3316 params->masks[i].bits[0] = oparams->masks[i]; 3317 memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals)); 3318 params->rmask = __OLD_TO_NEW_MASK(oparams->rmask); 3319 params->cmask = __OLD_TO_NEW_MASK(oparams->cmask); 3320 params->info = oparams->info; 3321 params->msbits = oparams->msbits; 3322 params->rate_num = oparams->rate_num; 3323 params->rate_den = oparams->rate_den; 3324 params->fifo_size = oparams->fifo_size; 3325 } 3326 3327 static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams, 3328 struct snd_pcm_hw_params *params) 3329 { 3330 unsigned int i; 3331 3332 memset(oparams, 0, sizeof(*oparams)); 3333 oparams->flags = params->flags; 3334 for (i = 0; i < ARRAY_SIZE(oparams->masks); i++) 3335 oparams->masks[i] = params->masks[i].bits[0]; 3336 memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals)); 3337 oparams->rmask = __NEW_TO_OLD_MASK(params->rmask); 3338 oparams->cmask = __NEW_TO_OLD_MASK(params->cmask); 3339 oparams->info = params->info; 3340 oparams->msbits = params->msbits; 3341 oparams->rate_num = params->rate_num; 3342 oparams->rate_den = params->rate_den; 3343 oparams->fifo_size = params->fifo_size; 3344 } 3345 3346 static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream, 3347 struct snd_pcm_hw_params_old __user * _oparams) 3348 { 3349 struct snd_pcm_hw_params *params; 3350 struct snd_pcm_hw_params_old *oparams = NULL; 3351 int err; 3352 3353 params = kmalloc(sizeof(*params), GFP_KERNEL); 3354 if (!params) { 3355 err = -ENOMEM; 3356 goto out; 3357 } 3358 oparams = kmalloc(sizeof(*oparams), GFP_KERNEL); 3359 if (!oparams) { 3360 err = -ENOMEM; 3361 goto out; 3362 } 3363 3364 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) { 3365 err = -EFAULT; 3366 goto out; 3367 } 3368 snd_pcm_hw_convert_from_old_params(params, oparams); 3369 err = snd_pcm_hw_refine(substream, params); 3370 snd_pcm_hw_convert_to_old_params(oparams, params); 3371 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3372 if (!err) 3373 err = -EFAULT; 3374 } 3375 out: 3376 kfree(params); 3377 kfree(oparams); 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 err = -ENOMEM; 3391 goto out; 3392 } 3393 oparams = kmalloc(sizeof(*oparams), GFP_KERNEL); 3394 if (!oparams) { 3395 err = -ENOMEM; 3396 goto out; 3397 } 3398 if (copy_from_user(oparams, _oparams, sizeof(*oparams))) { 3399 err = -EFAULT; 3400 goto out; 3401 } 3402 snd_pcm_hw_convert_from_old_params(params, oparams); 3403 err = snd_pcm_hw_params(substream, params); 3404 snd_pcm_hw_convert_to_old_params(oparams, params); 3405 if (copy_to_user(_oparams, oparams, sizeof(*oparams))) { 3406 if (!err) 3407 err = -EFAULT; 3408 } 3409 out: 3410 kfree(params); 3411 kfree(oparams); 3412 return err; 3413 } 3414 #endif /* CONFIG_SND_SUPPORT_OLD_API */ 3415 3416 /* 3417 * Register section 3418 */ 3419 3420 const struct file_operations snd_pcm_f_ops[2] = { 3421 { 3422 .owner = THIS_MODULE, 3423 .write = snd_pcm_write, 3424 .aio_write = snd_pcm_aio_write, 3425 .open = snd_pcm_playback_open, 3426 .release = snd_pcm_release, 3427 .poll = snd_pcm_playback_poll, 3428 .unlocked_ioctl = snd_pcm_playback_ioctl, 3429 .compat_ioctl = snd_pcm_ioctl_compat, 3430 .mmap = snd_pcm_mmap, 3431 .fasync = snd_pcm_fasync, 3432 }, 3433 { 3434 .owner = THIS_MODULE, 3435 .read = snd_pcm_read, 3436 .aio_read = snd_pcm_aio_read, 3437 .open = snd_pcm_capture_open, 3438 .release = snd_pcm_release, 3439 .poll = snd_pcm_capture_poll, 3440 .unlocked_ioctl = snd_pcm_capture_ioctl, 3441 .compat_ioctl = snd_pcm_ioctl_compat, 3442 .mmap = snd_pcm_mmap, 3443 .fasync = snd_pcm_fasync, 3444 } 3445 }; 3446