1/* 2 * Digital Audio (PCM) abstract layer 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * Abramo Bagnara <abramo@alsa-project.org> 5 * 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program; if not, write to the Free Software 19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 20 * 21 */ 22 23#include <linux/slab.h> 24#include <linux/time.h> 25#include <linux/math64.h> 26#include <sound/core.h> 27#include <sound/control.h> 28#include <sound/info.h> 29#include <sound/pcm.h> 30#include <sound/pcm_params.h> 31#include <sound/timer.h> 32 33/* 34 * fill ring buffer with silence 35 * runtime->silence_start: starting pointer to silence area 36 * runtime->silence_filled: size filled with silence 37 * runtime->silence_threshold: threshold from application 38 * runtime->silence_size: maximal size from application 39 * 40 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately 41 */ 42void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr) 43{ 44 struct snd_pcm_runtime *runtime = substream->runtime; 45 snd_pcm_uframes_t frames, ofs, transfer; 46 47 if (runtime->silence_size < runtime->boundary) { 48 snd_pcm_sframes_t noise_dist, n; 49 if (runtime->silence_start != runtime->control->appl_ptr) { 50 n = runtime->control->appl_ptr - runtime->silence_start; 51 if (n < 0) 52 n += runtime->boundary; 53 if ((snd_pcm_uframes_t)n < runtime->silence_filled) 54 runtime->silence_filled -= n; 55 else 56 runtime->silence_filled = 0; 57 runtime->silence_start = runtime->control->appl_ptr; 58 } 59 if (runtime->silence_filled >= runtime->buffer_size) 60 return; 61 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled; 62 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold) 63 return; 64 frames = runtime->silence_threshold - noise_dist; 65 if (frames > runtime->silence_size) 66 frames = runtime->silence_size; 67 } else { 68 if (new_hw_ptr == ULONG_MAX) { /* initialization */ 69 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime); 70 if (avail > runtime->buffer_size) 71 avail = runtime->buffer_size; 72 runtime->silence_filled = avail > 0 ? avail : 0; 73 runtime->silence_start = (runtime->status->hw_ptr + 74 runtime->silence_filled) % 75 runtime->boundary; 76 } else { 77 ofs = runtime->status->hw_ptr; 78 frames = new_hw_ptr - ofs; 79 if ((snd_pcm_sframes_t)frames < 0) 80 frames += runtime->boundary; 81 runtime->silence_filled -= frames; 82 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) { 83 runtime->silence_filled = 0; 84 runtime->silence_start = new_hw_ptr; 85 } else { 86 runtime->silence_start = ofs; 87 } 88 } 89 frames = runtime->buffer_size - runtime->silence_filled; 90 } 91 if (snd_BUG_ON(frames > runtime->buffer_size)) 92 return; 93 if (frames == 0) 94 return; 95 ofs = runtime->silence_start % runtime->buffer_size; 96 while (frames > 0) { 97 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames; 98 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || 99 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) { 100 if (substream->ops->silence) { 101 int err; 102 err = substream->ops->silence(substream, -1, ofs, transfer); 103 snd_BUG_ON(err < 0); 104 } else { 105 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs); 106 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels); 107 } 108 } else { 109 unsigned int c; 110 unsigned int channels = runtime->channels; 111 if (substream->ops->silence) { 112 for (c = 0; c < channels; ++c) { 113 int err; 114 err = substream->ops->silence(substream, c, ofs, transfer); 115 snd_BUG_ON(err < 0); 116 } 117 } else { 118 size_t dma_csize = runtime->dma_bytes / channels; 119 for (c = 0; c < channels; ++c) { 120 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs); 121 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer); 122 } 123 } 124 } 125 runtime->silence_filled += transfer; 126 frames -= transfer; 127 ofs = 0; 128 } 129} 130 131static void pcm_debug_name(struct snd_pcm_substream *substream, 132 char *name, size_t len) 133{ 134 snprintf(name, len, "pcmC%dD%d%c:%d", 135 substream->pcm->card->number, 136 substream->pcm->device, 137 substream->stream ? 'c' : 'p', 138 substream->number); 139} 140 141#define XRUN_DEBUG_BASIC (1<<0) 142#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */ 143#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */ 144#define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */ 145#define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */ 146#define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */ 147#define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */ 148 149#ifdef CONFIG_SND_PCM_XRUN_DEBUG 150 151#define xrun_debug(substream, mask) \ 152 ((substream)->pstr->xrun_debug & (mask)) 153#else 154#define xrun_debug(substream, mask) 0 155#endif 156 157#define dump_stack_on_xrun(substream) do { \ 158 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \ 159 dump_stack(); \ 160 } while (0) 161 162static void xrun(struct snd_pcm_substream *substream) 163{ 164 struct snd_pcm_runtime *runtime = substream->runtime; 165 166 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 167 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); 168 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); 169 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { 170 char name[16]; 171 pcm_debug_name(substream, name, sizeof(name)); 172 snd_printd(KERN_DEBUG "XRUN: %s\n", name); 173 dump_stack_on_xrun(substream); 174 } 175} 176 177#ifdef CONFIG_SND_PCM_XRUN_DEBUG 178#define hw_ptr_error(substream, fmt, args...) \ 179 do { \ 180 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \ 181 xrun_log_show(substream); \ 182 if (printk_ratelimit()) { \ 183 snd_printd("PCM: " fmt, ##args); \ 184 } \ 185 dump_stack_on_xrun(substream); \ 186 } \ 187 } while (0) 188 189#define XRUN_LOG_CNT 10 190 191struct hwptr_log_entry { 192 unsigned long jiffies; 193 snd_pcm_uframes_t pos; 194 snd_pcm_uframes_t period_size; 195 snd_pcm_uframes_t buffer_size; 196 snd_pcm_uframes_t old_hw_ptr; 197 snd_pcm_uframes_t hw_ptr_base; 198}; 199 200struct snd_pcm_hwptr_log { 201 unsigned int idx; 202 unsigned int hit: 1; 203 struct hwptr_log_entry entries[XRUN_LOG_CNT]; 204}; 205 206static void xrun_log(struct snd_pcm_substream *substream, 207 snd_pcm_uframes_t pos) 208{ 209 struct snd_pcm_runtime *runtime = substream->runtime; 210 struct snd_pcm_hwptr_log *log = runtime->hwptr_log; 211 struct hwptr_log_entry *entry; 212 213 if (log == NULL) { 214 log = kzalloc(sizeof(*log), GFP_ATOMIC); 215 if (log == NULL) 216 return; 217 runtime->hwptr_log = log; 218 } else { 219 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit) 220 return; 221 } 222 entry = &log->entries[log->idx]; 223 entry->jiffies = jiffies; 224 entry->pos = pos; 225 entry->period_size = runtime->period_size; 226 entry->buffer_size = runtime->buffer_size;; 227 entry->old_hw_ptr = runtime->status->hw_ptr; 228 entry->hw_ptr_base = runtime->hw_ptr_base; 229 log->idx = (log->idx + 1) % XRUN_LOG_CNT; 230} 231 232static void xrun_log_show(struct snd_pcm_substream *substream) 233{ 234 struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log; 235 struct hwptr_log_entry *entry; 236 char name[16]; 237 unsigned int idx; 238 int cnt; 239 240 if (log == NULL) 241 return; 242 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit) 243 return; 244 pcm_debug_name(substream, name, sizeof(name)); 245 for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) { 246 entry = &log->entries[idx]; 247 if (entry->period_size == 0) 248 break; 249 snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, " 250 "hwptr=%ld/%ld\n", 251 name, entry->jiffies, (unsigned long)entry->pos, 252 (unsigned long)entry->period_size, 253 (unsigned long)entry->buffer_size, 254 (unsigned long)entry->old_hw_ptr, 255 (unsigned long)entry->hw_ptr_base); 256 idx++; 257 idx %= XRUN_LOG_CNT; 258 } 259 log->hit = 1; 260} 261 262#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */ 263 264#define hw_ptr_error(substream, fmt, args...) do { } while (0) 265#define xrun_log(substream, pos) do { } while (0) 266#define xrun_log_show(substream) do { } while (0) 267 268#endif 269 270int snd_pcm_update_state(struct snd_pcm_substream *substream, 271 struct snd_pcm_runtime *runtime) 272{ 273 snd_pcm_uframes_t avail; 274 275 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) 276 avail = snd_pcm_playback_avail(runtime); 277 else 278 avail = snd_pcm_capture_avail(runtime); 279 if (avail > runtime->avail_max) 280 runtime->avail_max = avail; 281 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { 282 if (avail >= runtime->buffer_size) { 283 snd_pcm_drain_done(substream); 284 return -EPIPE; 285 } 286 } else { 287 if (avail >= runtime->stop_threshold) { 288 xrun(substream); 289 return -EPIPE; 290 } 291 } 292 if (runtime->twake) { 293 if (avail >= runtime->twake) 294 wake_up(&runtime->tsleep); 295 } else if (avail >= runtime->control->avail_min) 296 wake_up(&runtime->sleep); 297 return 0; 298} 299 300static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream, 301 unsigned int in_interrupt) 302{ 303 struct snd_pcm_runtime *runtime = substream->runtime; 304 snd_pcm_uframes_t pos; 305 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base; 306 snd_pcm_sframes_t hdelta, delta; 307 unsigned long jdelta; 308 309 old_hw_ptr = runtime->status->hw_ptr; 310 pos = substream->ops->pointer(substream); 311 if (pos == SNDRV_PCM_POS_XRUN) { 312 xrun(substream); 313 return -EPIPE; 314 } 315 if (pos >= runtime->buffer_size) { 316 if (printk_ratelimit()) { 317 char name[16]; 318 pcm_debug_name(substream, name, sizeof(name)); 319 xrun_log_show(substream); 320 snd_printd(KERN_ERR "BUG: %s, pos = %ld, " 321 "buffer size = %ld, period size = %ld\n", 322 name, pos, runtime->buffer_size, 323 runtime->period_size); 324 } 325 pos = 0; 326 } 327 pos -= pos % runtime->min_align; 328 if (xrun_debug(substream, XRUN_DEBUG_LOG)) 329 xrun_log(substream, pos); 330 hw_base = runtime->hw_ptr_base; 331 new_hw_ptr = hw_base + pos; 332 if (in_interrupt) { 333 /* we know that one period was processed */ 334 /* delta = "expected next hw_ptr" for in_interrupt != 0 */ 335 delta = runtime->hw_ptr_interrupt + runtime->period_size; 336 if (delta > new_hw_ptr) { 337 hw_base += runtime->buffer_size; 338 if (hw_base >= runtime->boundary) 339 hw_base = 0; 340 new_hw_ptr = hw_base + pos; 341 goto __delta; 342 } 343 } 344 /* new_hw_ptr might be lower than old_hw_ptr in case when */ 345 /* pointer crosses the end of the ring buffer */ 346 if (new_hw_ptr < old_hw_ptr) { 347 hw_base += runtime->buffer_size; 348 if (hw_base >= runtime->boundary) 349 hw_base = 0; 350 new_hw_ptr = hw_base + pos; 351 } 352 __delta: 353 delta = new_hw_ptr - old_hw_ptr; 354 if (delta < 0) 355 delta += runtime->boundary; 356 if (xrun_debug(substream, in_interrupt ? 357 XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) { 358 char name[16]; 359 pcm_debug_name(substream, name, sizeof(name)); 360 snd_printd("%s_update: %s: pos=%u/%u/%u, " 361 "hwptr=%ld/%ld/%ld/%ld\n", 362 in_interrupt ? "period" : "hwptr", 363 name, 364 (unsigned int)pos, 365 (unsigned int)runtime->period_size, 366 (unsigned int)runtime->buffer_size, 367 (unsigned long)delta, 368 (unsigned long)old_hw_ptr, 369 (unsigned long)new_hw_ptr, 370 (unsigned long)runtime->hw_ptr_base); 371 } 372 /* something must be really wrong */ 373 if (delta >= runtime->buffer_size + runtime->period_size) { 374 hw_ptr_error(substream, 375 "Unexpected hw_pointer value %s" 376 "(stream=%i, pos=%ld, new_hw_ptr=%ld, " 377 "old_hw_ptr=%ld)\n", 378 in_interrupt ? "[Q] " : "[P]", 379 substream->stream, (long)pos, 380 (long)new_hw_ptr, (long)old_hw_ptr); 381 return 0; 382 } 383 384 /* Do jiffies check only in xrun_debug mode */ 385 if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK)) 386 goto no_jiffies_check; 387 388 /* Skip the jiffies check for hardwares with BATCH flag. 389 * Such hardware usually just increases the position at each IRQ, 390 * thus it can't give any strange position. 391 */ 392 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH) 393 goto no_jiffies_check; 394 hdelta = delta; 395 if (hdelta < runtime->delay) 396 goto no_jiffies_check; 397 hdelta -= runtime->delay; 398 jdelta = jiffies - runtime->hw_ptr_jiffies; 399 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) { 400 delta = jdelta / 401 (((runtime->period_size * HZ) / runtime->rate) 402 + HZ/100); 403 /* move new_hw_ptr according jiffies not pos variable */ 404 new_hw_ptr = old_hw_ptr; 405 hw_base = delta; 406 /* use loop to avoid checks for delta overflows */ 407 /* the delta value is small or zero in most cases */ 408 while (delta > 0) { 409 new_hw_ptr += runtime->period_size; 410 if (new_hw_ptr >= runtime->boundary) 411 new_hw_ptr -= runtime->boundary; 412 delta--; 413 } 414 /* align hw_base to buffer_size */ 415 hw_ptr_error(substream, 416 "hw_ptr skipping! %s" 417 "(pos=%ld, delta=%ld, period=%ld, " 418 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n", 419 in_interrupt ? "[Q] " : "", 420 (long)pos, (long)hdelta, 421 (long)runtime->period_size, jdelta, 422 ((hdelta * HZ) / runtime->rate), hw_base, 423 (unsigned long)old_hw_ptr, 424 (unsigned long)new_hw_ptr); 425 /* reset values to proper state */ 426 delta = 0; 427 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size); 428 } 429 no_jiffies_check: 430 if (delta > runtime->period_size + runtime->period_size / 2) { 431 hw_ptr_error(substream, 432 "Lost interrupts? %s" 433 "(stream=%i, delta=%ld, new_hw_ptr=%ld, " 434 "old_hw_ptr=%ld)\n", 435 in_interrupt ? "[Q] " : "", 436 substream->stream, (long)delta, 437 (long)new_hw_ptr, 438 (long)old_hw_ptr); 439 } 440 441 if (runtime->status->hw_ptr == new_hw_ptr) 442 return 0; 443 444 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && 445 runtime->silence_size > 0) 446 snd_pcm_playback_silence(substream, new_hw_ptr); 447 448 if (in_interrupt) { 449 delta = new_hw_ptr - runtime->hw_ptr_interrupt; 450 if (delta < 0) 451 delta += runtime->boundary; 452 delta -= (snd_pcm_uframes_t)delta % runtime->period_size; 453 runtime->hw_ptr_interrupt += delta; 454 if (runtime->hw_ptr_interrupt >= runtime->boundary) 455 runtime->hw_ptr_interrupt -= runtime->boundary; 456 } 457 runtime->hw_ptr_base = hw_base; 458 runtime->status->hw_ptr = new_hw_ptr; 459 runtime->hw_ptr_jiffies = jiffies; 460 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) 461 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp); 462 463 return snd_pcm_update_state(substream, runtime); 464} 465 466/* CAUTION: call it with irq disabled */ 467int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream) 468{ 469 return snd_pcm_update_hw_ptr0(substream, 0); 470} 471 472/** 473 * snd_pcm_set_ops - set the PCM operators 474 * @pcm: the pcm instance 475 * @direction: stream direction, SNDRV_PCM_STREAM_XXX 476 * @ops: the operator table 477 * 478 * Sets the given PCM operators to the pcm instance. 479 */ 480void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops) 481{ 482 struct snd_pcm_str *stream = &pcm->streams[direction]; 483 struct snd_pcm_substream *substream; 484 485 for (substream = stream->substream; substream != NULL; substream = substream->next) 486 substream->ops = ops; 487} 488 489EXPORT_SYMBOL(snd_pcm_set_ops); 490 491/** 492 * snd_pcm_sync - set the PCM sync id 493 * @substream: the pcm substream 494 * 495 * Sets the PCM sync identifier for the card. 496 */ 497void snd_pcm_set_sync(struct snd_pcm_substream *substream) 498{ 499 struct snd_pcm_runtime *runtime = substream->runtime; 500 501 runtime->sync.id32[0] = substream->pcm->card->number; 502 runtime->sync.id32[1] = -1; 503 runtime->sync.id32[2] = -1; 504 runtime->sync.id32[3] = -1; 505} 506 507EXPORT_SYMBOL(snd_pcm_set_sync); 508 509/* 510 * Standard ioctl routine 511 */ 512 513static inline unsigned int div32(unsigned int a, unsigned int b, 514 unsigned int *r) 515{ 516 if (b == 0) { 517 *r = 0; 518 return UINT_MAX; 519 } 520 *r = a % b; 521 return a / b; 522} 523 524static inline unsigned int div_down(unsigned int a, unsigned int b) 525{ 526 if (b == 0) 527 return UINT_MAX; 528 return a / b; 529} 530 531static inline unsigned int div_up(unsigned int a, unsigned int b) 532{ 533 unsigned int r; 534 unsigned int q; 535 if (b == 0) 536 return UINT_MAX; 537 q = div32(a, b, &r); 538 if (r) 539 ++q; 540 return q; 541} 542 543static inline unsigned int mul(unsigned int a, unsigned int b) 544{ 545 if (a == 0) 546 return 0; 547 if (div_down(UINT_MAX, a) < b) 548 return UINT_MAX; 549 return a * b; 550} 551 552static inline unsigned int muldiv32(unsigned int a, unsigned int b, 553 unsigned int c, unsigned int *r) 554{ 555 u_int64_t n = (u_int64_t) a * b; 556 if (c == 0) { 557 snd_BUG_ON(!n); 558 *r = 0; 559 return UINT_MAX; 560 } 561 n = div_u64_rem(n, c, r); 562 if (n >= UINT_MAX) { 563 *r = 0; 564 return UINT_MAX; 565 } 566 return n; 567} 568 569/** 570 * snd_interval_refine - refine the interval value of configurator 571 * @i: the interval value to refine 572 * @v: the interval value to refer to 573 * 574 * Refines the interval value with the reference value. 575 * The interval is changed to the range satisfying both intervals. 576 * The interval status (min, max, integer, etc.) are evaluated. 577 * 578 * Returns non-zero if the value is changed, zero if not changed. 579 */ 580int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v) 581{ 582 int changed = 0; 583 if (snd_BUG_ON(snd_interval_empty(i))) 584 return -EINVAL; 585 if (i->min < v->min) { 586 i->min = v->min; 587 i->openmin = v->openmin; 588 changed = 1; 589 } else if (i->min == v->min && !i->openmin && v->openmin) { 590 i->openmin = 1; 591 changed = 1; 592 } 593 if (i->max > v->max) { 594 i->max = v->max; 595 i->openmax = v->openmax; 596 changed = 1; 597 } else if (i->max == v->max && !i->openmax && v->openmax) { 598 i->openmax = 1; 599 changed = 1; 600 } 601 if (!i->integer && v->integer) { 602 i->integer = 1; 603 changed = 1; 604 } 605 if (i->integer) { 606 if (i->openmin) { 607 i->min++; 608 i->openmin = 0; 609 } 610 if (i->openmax) { 611 i->max--; 612 i->openmax = 0; 613 } 614 } else if (!i->openmin && !i->openmax && i->min == i->max) 615 i->integer = 1; 616 if (snd_interval_checkempty(i)) { 617 snd_interval_none(i); 618 return -EINVAL; 619 } 620 return changed; 621} 622 623EXPORT_SYMBOL(snd_interval_refine); 624 625static int snd_interval_refine_first(struct snd_interval *i) 626{ 627 if (snd_BUG_ON(snd_interval_empty(i))) 628 return -EINVAL; 629 if (snd_interval_single(i)) 630 return 0; 631 i->max = i->min; 632 i->openmax = i->openmin; 633 if (i->openmax) 634 i->max++; 635 return 1; 636} 637 638static int snd_interval_refine_last(struct snd_interval *i) 639{ 640 if (snd_BUG_ON(snd_interval_empty(i))) 641 return -EINVAL; 642 if (snd_interval_single(i)) 643 return 0; 644 i->min = i->max; 645 i->openmin = i->openmax; 646 if (i->openmin) 647 i->min--; 648 return 1; 649} 650 651void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c) 652{ 653 if (a->empty || b->empty) { 654 snd_interval_none(c); 655 return; 656 } 657 c->empty = 0; 658 c->min = mul(a->min, b->min); 659 c->openmin = (a->openmin || b->openmin); 660 c->max = mul(a->max, b->max); 661 c->openmax = (a->openmax || b->openmax); 662 c->integer = (a->integer && b->integer); 663} 664 665/** 666 * snd_interval_div - refine the interval value with division 667 * @a: dividend 668 * @b: divisor 669 * @c: quotient 670 * 671 * c = a / b 672 * 673 * Returns non-zero if the value is changed, zero if not changed. 674 */ 675void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c) 676{ 677 unsigned int r; 678 if (a->empty || b->empty) { 679 snd_interval_none(c); 680 return; 681 } 682 c->empty = 0; 683 c->min = div32(a->min, b->max, &r); 684 c->openmin = (r || a->openmin || b->openmax); 685 if (b->min > 0) { 686 c->max = div32(a->max, b->min, &r); 687 if (r) { 688 c->max++; 689 c->openmax = 1; 690 } else 691 c->openmax = (a->openmax || b->openmin); 692 } else { 693 c->max = UINT_MAX; 694 c->openmax = 0; 695 } 696 c->integer = 0; 697} 698 699/** 700 * snd_interval_muldivk - refine the interval value 701 * @a: dividend 1 702 * @b: dividend 2 703 * @k: divisor (as integer) 704 * @c: result 705 * 706 * c = a * b / k 707 * 708 * Returns non-zero if the value is changed, zero if not changed. 709 */ 710void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b, 711 unsigned int k, struct snd_interval *c) 712{ 713 unsigned int r; 714 if (a->empty || b->empty) { 715 snd_interval_none(c); 716 return; 717 } 718 c->empty = 0; 719 c->min = muldiv32(a->min, b->min, k, &r); 720 c->openmin = (r || a->openmin || b->openmin); 721 c->max = muldiv32(a->max, b->max, k, &r); 722 if (r) { 723 c->max++; 724 c->openmax = 1; 725 } else 726 c->openmax = (a->openmax || b->openmax); 727 c->integer = 0; 728} 729 730/** 731 * snd_interval_mulkdiv - refine the interval value 732 * @a: dividend 1 733 * @k: dividend 2 (as integer) 734 * @b: divisor 735 * @c: result 736 * 737 * c = a * k / b 738 * 739 * Returns non-zero if the value is changed, zero if not changed. 740 */ 741void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k, 742 const struct snd_interval *b, struct snd_interval *c) 743{ 744 unsigned int r; 745 if (a->empty || b->empty) { 746 snd_interval_none(c); 747 return; 748 } 749 c->empty = 0; 750 c->min = muldiv32(a->min, k, b->max, &r); 751 c->openmin = (r || a->openmin || b->openmax); 752 if (b->min > 0) { 753 c->max = muldiv32(a->max, k, b->min, &r); 754 if (r) { 755 c->max++; 756 c->openmax = 1; 757 } else 758 c->openmax = (a->openmax || b->openmin); 759 } else { 760 c->max = UINT_MAX; 761 c->openmax = 0; 762 } 763 c->integer = 0; 764} 765 766/* ---- */ 767 768 769/** 770 * snd_interval_ratnum - refine the interval value 771 * @i: interval to refine 772 * @rats_count: number of ratnum_t 773 * @rats: ratnum_t array 774 * @nump: pointer to store the resultant numerator 775 * @denp: pointer to store the resultant denominator 776 * 777 * Returns non-zero if the value is changed, zero if not changed. 778 */ 779int snd_interval_ratnum(struct snd_interval *i, 780 unsigned int rats_count, struct snd_ratnum *rats, 781 unsigned int *nump, unsigned int *denp) 782{ 783 unsigned int best_num, best_den; 784 int best_diff; 785 unsigned int k; 786 struct snd_interval t; 787 int err; 788 unsigned int result_num, result_den; 789 int result_diff; 790 791 best_num = best_den = best_diff = 0; 792 for (k = 0; k < rats_count; ++k) { 793 unsigned int num = rats[k].num; 794 unsigned int den; 795 unsigned int q = i->min; 796 int diff; 797 if (q == 0) 798 q = 1; 799 den = div_up(num, q); 800 if (den < rats[k].den_min) 801 continue; 802 if (den > rats[k].den_max) 803 den = rats[k].den_max; 804 else { 805 unsigned int r; 806 r = (den - rats[k].den_min) % rats[k].den_step; 807 if (r != 0) 808 den -= r; 809 } 810 diff = num - q * den; 811 if (diff < 0) 812 diff = -diff; 813 if (best_num == 0 || 814 diff * best_den < best_diff * den) { 815 best_diff = diff; 816 best_den = den; 817 best_num = num; 818 } 819 } 820 if (best_den == 0) { 821 i->empty = 1; 822 return -EINVAL; 823 } 824 t.min = div_down(best_num, best_den); 825 t.openmin = !!(best_num % best_den); 826 827 result_num = best_num; 828 result_diff = best_diff; 829 result_den = best_den; 830 best_num = best_den = best_diff = 0; 831 for (k = 0; k < rats_count; ++k) { 832 unsigned int num = rats[k].num; 833 unsigned int den; 834 unsigned int q = i->max; 835 int diff; 836 if (q == 0) { 837 i->empty = 1; 838 return -EINVAL; 839 } 840 den = div_down(num, q); 841 if (den > rats[k].den_max) 842 continue; 843 if (den < rats[k].den_min) 844 den = rats[k].den_min; 845 else { 846 unsigned int r; 847 r = (den - rats[k].den_min) % rats[k].den_step; 848 if (r != 0) 849 den += rats[k].den_step - r; 850 } 851 diff = q * den - num; 852 if (diff < 0) 853 diff = -diff; 854 if (best_num == 0 || 855 diff * best_den < best_diff * den) { 856 best_diff = diff; 857 best_den = den; 858 best_num = num; 859 } 860 } 861 if (best_den == 0) { 862 i->empty = 1; 863 return -EINVAL; 864 } 865 t.max = div_up(best_num, best_den); 866 t.openmax = !!(best_num % best_den); 867 t.integer = 0; 868 err = snd_interval_refine(i, &t); 869 if (err < 0) 870 return err; 871 872 if (snd_interval_single(i)) { 873 if (best_diff * result_den < result_diff * best_den) { 874 result_num = best_num; 875 result_den = best_den; 876 } 877 if (nump) 878 *nump = result_num; 879 if (denp) 880 *denp = result_den; 881 } 882 return err; 883} 884 885EXPORT_SYMBOL(snd_interval_ratnum); 886 887/** 888 * snd_interval_ratden - refine the interval value 889 * @i: interval to refine 890 * @rats_count: number of struct ratden 891 * @rats: struct ratden array 892 * @nump: pointer to store the resultant numerator 893 * @denp: pointer to store the resultant denominator 894 * 895 * Returns non-zero if the value is changed, zero if not changed. 896 */ 897static int snd_interval_ratden(struct snd_interval *i, 898 unsigned int rats_count, struct snd_ratden *rats, 899 unsigned int *nump, unsigned int *denp) 900{ 901 unsigned int best_num, best_diff, best_den; 902 unsigned int k; 903 struct snd_interval t; 904 int err; 905 906 best_num = best_den = best_diff = 0; 907 for (k = 0; k < rats_count; ++k) { 908 unsigned int num; 909 unsigned int den = rats[k].den; 910 unsigned int q = i->min; 911 int diff; 912 num = mul(q, den); 913 if (num > rats[k].num_max) 914 continue; 915 if (num < rats[k].num_min) 916 num = rats[k].num_max; 917 else { 918 unsigned int r; 919 r = (num - rats[k].num_min) % rats[k].num_step; 920 if (r != 0) 921 num += rats[k].num_step - r; 922 } 923 diff = num - q * den; 924 if (best_num == 0 || 925 diff * best_den < best_diff * den) { 926 best_diff = diff; 927 best_den = den; 928 best_num = num; 929 } 930 } 931 if (best_den == 0) { 932 i->empty = 1; 933 return -EINVAL; 934 } 935 t.min = div_down(best_num, best_den); 936 t.openmin = !!(best_num % best_den); 937 938 best_num = best_den = best_diff = 0; 939 for (k = 0; k < rats_count; ++k) { 940 unsigned int num; 941 unsigned int den = rats[k].den; 942 unsigned int q = i->max; 943 int diff; 944 num = mul(q, den); 945 if (num < rats[k].num_min) 946 continue; 947 if (num > rats[k].num_max) 948 num = rats[k].num_max; 949 else { 950 unsigned int r; 951 r = (num - rats[k].num_min) % rats[k].num_step; 952 if (r != 0) 953 num -= r; 954 } 955 diff = q * den - num; 956 if (best_num == 0 || 957 diff * best_den < best_diff * den) { 958 best_diff = diff; 959 best_den = den; 960 best_num = num; 961 } 962 } 963 if (best_den == 0) { 964 i->empty = 1; 965 return -EINVAL; 966 } 967 t.max = div_up(best_num, best_den); 968 t.openmax = !!(best_num % best_den); 969 t.integer = 0; 970 err = snd_interval_refine(i, &t); 971 if (err < 0) 972 return err; 973 974 if (snd_interval_single(i)) { 975 if (nump) 976 *nump = best_num; 977 if (denp) 978 *denp = best_den; 979 } 980 return err; 981} 982 983/** 984 * snd_interval_list - refine the interval value from the list 985 * @i: the interval value to refine 986 * @count: the number of elements in the list 987 * @list: the value list 988 * @mask: the bit-mask to evaluate 989 * 990 * Refines the interval value from the list. 991 * When mask is non-zero, only the elements corresponding to bit 1 are 992 * evaluated. 993 * 994 * Returns non-zero if the value is changed, zero if not changed. 995 */ 996int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask) 997{ 998 unsigned int k; 999 struct snd_interval list_range; 1000 1001 if (!count) { 1002 i->empty = 1; 1003 return -EINVAL; 1004 } 1005 snd_interval_any(&list_range); 1006 list_range.min = UINT_MAX; 1007 list_range.max = 0; 1008 for (k = 0; k < count; k++) { 1009 if (mask && !(mask & (1 << k))) 1010 continue; 1011 if (!snd_interval_test(i, list[k])) 1012 continue; 1013 list_range.min = min(list_range.min, list[k]); 1014 list_range.max = max(list_range.max, list[k]); 1015 } 1016 return snd_interval_refine(i, &list_range); 1017} 1018 1019EXPORT_SYMBOL(snd_interval_list); 1020 1021static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step) 1022{ 1023 unsigned int n; 1024 int changed = 0; 1025 n = (i->min - min) % step; 1026 if (n != 0 || i->openmin) { 1027 i->min += step - n; 1028 changed = 1; 1029 } 1030 n = (i->max - min) % step; 1031 if (n != 0 || i->openmax) { 1032 i->max -= n; 1033 changed = 1; 1034 } 1035 if (snd_interval_checkempty(i)) { 1036 i->empty = 1; 1037 return -EINVAL; 1038 } 1039 return changed; 1040} 1041 1042/* Info constraints helpers */ 1043 1044/** 1045 * snd_pcm_hw_rule_add - add the hw-constraint rule 1046 * @runtime: the pcm runtime instance 1047 * @cond: condition bits 1048 * @var: the variable to evaluate 1049 * @func: the evaluation function 1050 * @private: the private data pointer passed to function 1051 * @dep: the dependent variables 1052 * 1053 * Returns zero if successful, or a negative error code on failure. 1054 */ 1055int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond, 1056 int var, 1057 snd_pcm_hw_rule_func_t func, void *private, 1058 int dep, ...) 1059{ 1060 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1061 struct snd_pcm_hw_rule *c; 1062 unsigned int k; 1063 va_list args; 1064 va_start(args, dep); 1065 if (constrs->rules_num >= constrs->rules_all) { 1066 struct snd_pcm_hw_rule *new; 1067 unsigned int new_rules = constrs->rules_all + 16; 1068 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL); 1069 if (!new) 1070 return -ENOMEM; 1071 if (constrs->rules) { 1072 memcpy(new, constrs->rules, 1073 constrs->rules_num * sizeof(*c)); 1074 kfree(constrs->rules); 1075 } 1076 constrs->rules = new; 1077 constrs->rules_all = new_rules; 1078 } 1079 c = &constrs->rules[constrs->rules_num]; 1080 c->cond = cond; 1081 c->func = func; 1082 c->var = var; 1083 c->private = private; 1084 k = 0; 1085 while (1) { 1086 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) 1087 return -EINVAL; 1088 c->deps[k++] = dep; 1089 if (dep < 0) 1090 break; 1091 dep = va_arg(args, int); 1092 } 1093 constrs->rules_num++; 1094 va_end(args); 1095 return 0; 1096} 1097 1098EXPORT_SYMBOL(snd_pcm_hw_rule_add); 1099 1100/** 1101 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint 1102 * @runtime: PCM runtime instance 1103 * @var: hw_params variable to apply the mask 1104 * @mask: the bitmap mask 1105 * 1106 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter. 1107 */ 1108int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1109 u_int32_t mask) 1110{ 1111 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1112 struct snd_mask *maskp = constrs_mask(constrs, var); 1113 *maskp->bits &= mask; 1114 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */ 1115 if (*maskp->bits == 0) 1116 return -EINVAL; 1117 return 0; 1118} 1119 1120/** 1121 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint 1122 * @runtime: PCM runtime instance 1123 * @var: hw_params variable to apply the mask 1124 * @mask: the 64bit bitmap mask 1125 * 1126 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter. 1127 */ 1128int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1129 u_int64_t mask) 1130{ 1131 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1132 struct snd_mask *maskp = constrs_mask(constrs, var); 1133 maskp->bits[0] &= (u_int32_t)mask; 1134 maskp->bits[1] &= (u_int32_t)(mask >> 32); 1135 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ 1136 if (! maskp->bits[0] && ! maskp->bits[1]) 1137 return -EINVAL; 1138 return 0; 1139} 1140 1141/** 1142 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval 1143 * @runtime: PCM runtime instance 1144 * @var: hw_params variable to apply the integer constraint 1145 * 1146 * Apply the constraint of integer to an interval parameter. 1147 */ 1148int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var) 1149{ 1150 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1151 return snd_interval_setinteger(constrs_interval(constrs, var)); 1152} 1153 1154EXPORT_SYMBOL(snd_pcm_hw_constraint_integer); 1155 1156/** 1157 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval 1158 * @runtime: PCM runtime instance 1159 * @var: hw_params variable to apply the range 1160 * @min: the minimal value 1161 * @max: the maximal value 1162 * 1163 * Apply the min/max range constraint to an interval parameter. 1164 */ 1165int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var, 1166 unsigned int min, unsigned int max) 1167{ 1168 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints; 1169 struct snd_interval t; 1170 t.min = min; 1171 t.max = max; 1172 t.openmin = t.openmax = 0; 1173 t.integer = 0; 1174 return snd_interval_refine(constrs_interval(constrs, var), &t); 1175} 1176 1177EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax); 1178 1179static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params, 1180 struct snd_pcm_hw_rule *rule) 1181{ 1182 struct snd_pcm_hw_constraint_list *list = rule->private; 1183 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask); 1184} 1185 1186 1187/** 1188 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter 1189 * @runtime: PCM runtime instance 1190 * @cond: condition bits 1191 * @var: hw_params variable to apply the list constraint 1192 * @l: list 1193 * 1194 * Apply the list of constraints to an interval parameter. 1195 */ 1196int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime, 1197 unsigned int cond, 1198 snd_pcm_hw_param_t var, 1199 struct snd_pcm_hw_constraint_list *l) 1200{ 1201 return snd_pcm_hw_rule_add(runtime, cond, var, 1202 snd_pcm_hw_rule_list, l, 1203 var, -1); 1204} 1205 1206EXPORT_SYMBOL(snd_pcm_hw_constraint_list); 1207 1208static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params, 1209 struct snd_pcm_hw_rule *rule) 1210{ 1211 struct snd_pcm_hw_constraint_ratnums *r = rule->private; 1212 unsigned int num = 0, den = 0; 1213 int err; 1214 err = snd_interval_ratnum(hw_param_interval(params, rule->var), 1215 r->nrats, r->rats, &num, &den); 1216 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { 1217 params->rate_num = num; 1218 params->rate_den = den; 1219 } 1220 return err; 1221} 1222 1223/** 1224 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter 1225 * @runtime: PCM runtime instance 1226 * @cond: condition bits 1227 * @var: hw_params variable to apply the ratnums constraint 1228 * @r: struct snd_ratnums constriants 1229 */ 1230int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime, 1231 unsigned int cond, 1232 snd_pcm_hw_param_t var, 1233 struct snd_pcm_hw_constraint_ratnums *r) 1234{ 1235 return snd_pcm_hw_rule_add(runtime, cond, var, 1236 snd_pcm_hw_rule_ratnums, r, 1237 var, -1); 1238} 1239 1240EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums); 1241 1242static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params, 1243 struct snd_pcm_hw_rule *rule) 1244{ 1245 struct snd_pcm_hw_constraint_ratdens *r = rule->private; 1246 unsigned int num = 0, den = 0; 1247 int err = snd_interval_ratden(hw_param_interval(params, rule->var), 1248 r->nrats, r->rats, &num, &den); 1249 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { 1250 params->rate_num = num; 1251 params->rate_den = den; 1252 } 1253 return err; 1254} 1255 1256/** 1257 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter 1258 * @runtime: PCM runtime instance 1259 * @cond: condition bits 1260 * @var: hw_params variable to apply the ratdens constraint 1261 * @r: struct snd_ratdens constriants 1262 */ 1263int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime, 1264 unsigned int cond, 1265 snd_pcm_hw_param_t var, 1266 struct snd_pcm_hw_constraint_ratdens *r) 1267{ 1268 return snd_pcm_hw_rule_add(runtime, cond, var, 1269 snd_pcm_hw_rule_ratdens, r, 1270 var, -1); 1271} 1272 1273EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens); 1274 1275static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params, 1276 struct snd_pcm_hw_rule *rule) 1277{ 1278 unsigned int l = (unsigned long) rule->private; 1279 int width = l & 0xffff; 1280 unsigned int msbits = l >> 16; 1281 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); 1282 if (snd_interval_single(i) && snd_interval_value(i) == width) 1283 params->msbits = msbits; 1284 return 0; 1285} 1286 1287/** 1288 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule 1289 * @runtime: PCM runtime instance 1290 * @cond: condition bits 1291 * @width: sample bits width 1292 * @msbits: msbits width 1293 */ 1294int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime, 1295 unsigned int cond, 1296 unsigned int width, 1297 unsigned int msbits) 1298{ 1299 unsigned long l = (msbits << 16) | width; 1300 return snd_pcm_hw_rule_add(runtime, cond, -1, 1301 snd_pcm_hw_rule_msbits, 1302 (void*) l, 1303 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); 1304} 1305 1306EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits); 1307 1308static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params, 1309 struct snd_pcm_hw_rule *rule) 1310{ 1311 unsigned long step = (unsigned long) rule->private; 1312 return snd_interval_step(hw_param_interval(params, rule->var), 0, step); 1313} 1314 1315/** 1316 * snd_pcm_hw_constraint_step - add a hw constraint step rule 1317 * @runtime: PCM runtime instance 1318 * @cond: condition bits 1319 * @var: hw_params variable to apply the step constraint 1320 * @step: step size 1321 */ 1322int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime, 1323 unsigned int cond, 1324 snd_pcm_hw_param_t var, 1325 unsigned long step) 1326{ 1327 return snd_pcm_hw_rule_add(runtime, cond, var, 1328 snd_pcm_hw_rule_step, (void *) step, 1329 var, -1); 1330} 1331 1332EXPORT_SYMBOL(snd_pcm_hw_constraint_step); 1333 1334static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule) 1335{ 1336 static unsigned int pow2_sizes[] = { 1337 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7, 1338 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15, 1339 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23, 1340 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30 1341 }; 1342 return snd_interval_list(hw_param_interval(params, rule->var), 1343 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0); 1344} 1345 1346/** 1347 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule 1348 * @runtime: PCM runtime instance 1349 * @cond: condition bits 1350 * @var: hw_params variable to apply the power-of-2 constraint 1351 */ 1352int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime, 1353 unsigned int cond, 1354 snd_pcm_hw_param_t var) 1355{ 1356 return snd_pcm_hw_rule_add(runtime, cond, var, 1357 snd_pcm_hw_rule_pow2, NULL, 1358 var, -1); 1359} 1360 1361EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2); 1362 1363static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params, 1364 snd_pcm_hw_param_t var) 1365{ 1366 if (hw_is_mask(var)) { 1367 snd_mask_any(hw_param_mask(params, var)); 1368 params->cmask |= 1 << var; 1369 params->rmask |= 1 << var; 1370 return; 1371 } 1372 if (hw_is_interval(var)) { 1373 snd_interval_any(hw_param_interval(params, var)); 1374 params->cmask |= 1 << var; 1375 params->rmask |= 1 << var; 1376 return; 1377 } 1378 snd_BUG(); 1379} 1380 1381void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params) 1382{ 1383 unsigned int k; 1384 memset(params, 0, sizeof(*params)); 1385 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) 1386 _snd_pcm_hw_param_any(params, k); 1387 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) 1388 _snd_pcm_hw_param_any(params, k); 1389 params->info = ~0U; 1390} 1391 1392EXPORT_SYMBOL(_snd_pcm_hw_params_any); 1393 1394/** 1395 * snd_pcm_hw_param_value - return @params field @var value 1396 * @params: the hw_params instance 1397 * @var: parameter to retrieve 1398 * @dir: pointer to the direction (-1,0,1) or %NULL 1399 * 1400 * Return the value for field @var if it's fixed in configuration space 1401 * defined by @params. Return -%EINVAL otherwise. 1402 */ 1403int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params, 1404 snd_pcm_hw_param_t var, int *dir) 1405{ 1406 if (hw_is_mask(var)) { 1407 const struct snd_mask *mask = hw_param_mask_c(params, var); 1408 if (!snd_mask_single(mask)) 1409 return -EINVAL; 1410 if (dir) 1411 *dir = 0; 1412 return snd_mask_value(mask); 1413 } 1414 if (hw_is_interval(var)) { 1415 const struct snd_interval *i = hw_param_interval_c(params, var); 1416 if (!snd_interval_single(i)) 1417 return -EINVAL; 1418 if (dir) 1419 *dir = i->openmin; 1420 return snd_interval_value(i); 1421 } 1422 return -EINVAL; 1423} 1424 1425EXPORT_SYMBOL(snd_pcm_hw_param_value); 1426 1427void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params, 1428 snd_pcm_hw_param_t var) 1429{ 1430 if (hw_is_mask(var)) { 1431 snd_mask_none(hw_param_mask(params, var)); 1432 params->cmask |= 1 << var; 1433 params->rmask |= 1 << var; 1434 } else if (hw_is_interval(var)) { 1435 snd_interval_none(hw_param_interval(params, var)); 1436 params->cmask |= 1 << var; 1437 params->rmask |= 1 << var; 1438 } else { 1439 snd_BUG(); 1440 } 1441} 1442 1443EXPORT_SYMBOL(_snd_pcm_hw_param_setempty); 1444 1445static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params, 1446 snd_pcm_hw_param_t var) 1447{ 1448 int changed; 1449 if (hw_is_mask(var)) 1450 changed = snd_mask_refine_first(hw_param_mask(params, var)); 1451 else if (hw_is_interval(var)) 1452 changed = snd_interval_refine_first(hw_param_interval(params, var)); 1453 else 1454 return -EINVAL; 1455 if (changed) { 1456 params->cmask |= 1 << var; 1457 params->rmask |= 1 << var; 1458 } 1459 return changed; 1460} 1461 1462 1463/** 1464 * snd_pcm_hw_param_first - refine config space and return minimum value 1465 * @pcm: PCM instance 1466 * @params: the hw_params instance 1467 * @var: parameter to retrieve 1468 * @dir: pointer to the direction (-1,0,1) or %NULL 1469 * 1470 * Inside configuration space defined by @params remove from @var all 1471 * values > minimum. Reduce configuration space accordingly. 1472 * Return the minimum. 1473 */ 1474int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm, 1475 struct snd_pcm_hw_params *params, 1476 snd_pcm_hw_param_t var, int *dir) 1477{ 1478 int changed = _snd_pcm_hw_param_first(params, var); 1479 if (changed < 0) 1480 return changed; 1481 if (params->rmask) { 1482 int err = snd_pcm_hw_refine(pcm, params); 1483 if (snd_BUG_ON(err < 0)) 1484 return err; 1485 } 1486 return snd_pcm_hw_param_value(params, var, dir); 1487} 1488 1489EXPORT_SYMBOL(snd_pcm_hw_param_first); 1490 1491static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params, 1492 snd_pcm_hw_param_t var) 1493{ 1494 int changed; 1495 if (hw_is_mask(var)) 1496 changed = snd_mask_refine_last(hw_param_mask(params, var)); 1497 else if (hw_is_interval(var)) 1498 changed = snd_interval_refine_last(hw_param_interval(params, var)); 1499 else 1500 return -EINVAL; 1501 if (changed) { 1502 params->cmask |= 1 << var; 1503 params->rmask |= 1 << var; 1504 } 1505 return changed; 1506} 1507 1508 1509/** 1510 * snd_pcm_hw_param_last - refine config space and return maximum value 1511 * @pcm: PCM instance 1512 * @params: the hw_params instance 1513 * @var: parameter to retrieve 1514 * @dir: pointer to the direction (-1,0,1) or %NULL 1515 * 1516 * Inside configuration space defined by @params remove from @var all 1517 * values < maximum. Reduce configuration space accordingly. 1518 * Return the maximum. 1519 */ 1520int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm, 1521 struct snd_pcm_hw_params *params, 1522 snd_pcm_hw_param_t var, int *dir) 1523{ 1524 int changed = _snd_pcm_hw_param_last(params, var); 1525 if (changed < 0) 1526 return changed; 1527 if (params->rmask) { 1528 int err = snd_pcm_hw_refine(pcm, params); 1529 if (snd_BUG_ON(err < 0)) 1530 return err; 1531 } 1532 return snd_pcm_hw_param_value(params, var, dir); 1533} 1534 1535EXPORT_SYMBOL(snd_pcm_hw_param_last); 1536 1537/** 1538 * snd_pcm_hw_param_choose - choose a configuration defined by @params 1539 * @pcm: PCM instance 1540 * @params: the hw_params instance 1541 * 1542 * Choose one configuration from configuration space defined by @params. 1543 * The configuration chosen is that obtained fixing in this order: 1544 * first access, first format, first subformat, min channels, 1545 * min rate, min period time, max buffer size, min tick time 1546 */ 1547int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm, 1548 struct snd_pcm_hw_params *params) 1549{ 1550 static int vars[] = { 1551 SNDRV_PCM_HW_PARAM_ACCESS, 1552 SNDRV_PCM_HW_PARAM_FORMAT, 1553 SNDRV_PCM_HW_PARAM_SUBFORMAT, 1554 SNDRV_PCM_HW_PARAM_CHANNELS, 1555 SNDRV_PCM_HW_PARAM_RATE, 1556 SNDRV_PCM_HW_PARAM_PERIOD_TIME, 1557 SNDRV_PCM_HW_PARAM_BUFFER_SIZE, 1558 SNDRV_PCM_HW_PARAM_TICK_TIME, 1559 -1 1560 }; 1561 int err, *v; 1562 1563 for (v = vars; *v != -1; v++) { 1564 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE) 1565 err = snd_pcm_hw_param_first(pcm, params, *v, NULL); 1566 else 1567 err = snd_pcm_hw_param_last(pcm, params, *v, NULL); 1568 if (snd_BUG_ON(err < 0)) 1569 return err; 1570 } 1571 return 0; 1572} 1573 1574static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream, 1575 void *arg) 1576{ 1577 struct snd_pcm_runtime *runtime = substream->runtime; 1578 unsigned long flags; 1579 snd_pcm_stream_lock_irqsave(substream, flags); 1580 if (snd_pcm_running(substream) && 1581 snd_pcm_update_hw_ptr(substream) >= 0) 1582 runtime->status->hw_ptr %= runtime->buffer_size; 1583 else 1584 runtime->status->hw_ptr = 0; 1585 snd_pcm_stream_unlock_irqrestore(substream, flags); 1586 return 0; 1587} 1588 1589static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream, 1590 void *arg) 1591{ 1592 struct snd_pcm_channel_info *info = arg; 1593 struct snd_pcm_runtime *runtime = substream->runtime; 1594 int width; 1595 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) { 1596 info->offset = -1; 1597 return 0; 1598 } 1599 width = snd_pcm_format_physical_width(runtime->format); 1600 if (width < 0) 1601 return width; 1602 info->offset = 0; 1603 switch (runtime->access) { 1604 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED: 1605 case SNDRV_PCM_ACCESS_RW_INTERLEAVED: 1606 info->first = info->channel * width; 1607 info->step = runtime->channels * width; 1608 break; 1609 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED: 1610 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED: 1611 { 1612 size_t size = runtime->dma_bytes / runtime->channels; 1613 info->first = info->channel * size * 8; 1614 info->step = width; 1615 break; 1616 } 1617 default: 1618 snd_BUG(); 1619 break; 1620 } 1621 return 0; 1622} 1623 1624static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream, 1625 void *arg) 1626{ 1627 struct snd_pcm_hw_params *params = arg; 1628 snd_pcm_format_t format; 1629 int channels, width; 1630 1631 params->fifo_size = substream->runtime->hw.fifo_size; 1632 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) { 1633 format = params_format(params); 1634 channels = params_channels(params); 1635 width = snd_pcm_format_physical_width(format); 1636 params->fifo_size /= width * channels; 1637 } 1638 return 0; 1639} 1640 1641/** 1642 * snd_pcm_lib_ioctl - a generic PCM ioctl callback 1643 * @substream: the pcm substream instance 1644 * @cmd: ioctl command 1645 * @arg: ioctl argument 1646 * 1647 * Processes the generic ioctl commands for PCM. 1648 * Can be passed as the ioctl callback for PCM ops. 1649 * 1650 * Returns zero if successful, or a negative error code on failure. 1651 */ 1652int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream, 1653 unsigned int cmd, void *arg) 1654{ 1655 switch (cmd) { 1656 case SNDRV_PCM_IOCTL1_INFO: 1657 return 0; 1658 case SNDRV_PCM_IOCTL1_RESET: 1659 return snd_pcm_lib_ioctl_reset(substream, arg); 1660 case SNDRV_PCM_IOCTL1_CHANNEL_INFO: 1661 return snd_pcm_lib_ioctl_channel_info(substream, arg); 1662 case SNDRV_PCM_IOCTL1_FIFO_SIZE: 1663 return snd_pcm_lib_ioctl_fifo_size(substream, arg); 1664 } 1665 return -ENXIO; 1666} 1667 1668EXPORT_SYMBOL(snd_pcm_lib_ioctl); 1669 1670/** 1671 * snd_pcm_period_elapsed - update the pcm status for the next period 1672 * @substream: the pcm substream instance 1673 * 1674 * This function is called from the interrupt handler when the 1675 * PCM has processed the period size. It will update the current 1676 * pointer, wake up sleepers, etc. 1677 * 1678 * Even if more than one periods have elapsed since the last call, you 1679 * have to call this only once. 1680 */ 1681void snd_pcm_period_elapsed(struct snd_pcm_substream *substream) 1682{ 1683 struct snd_pcm_runtime *runtime; 1684 unsigned long flags; 1685 1686 if (PCM_RUNTIME_CHECK(substream)) 1687 return; 1688 runtime = substream->runtime; 1689 1690 if (runtime->transfer_ack_begin) 1691 runtime->transfer_ack_begin(substream); 1692 1693 snd_pcm_stream_lock_irqsave(substream, flags); 1694 if (!snd_pcm_running(substream) || 1695 snd_pcm_update_hw_ptr0(substream, 1) < 0) 1696 goto _end; 1697 1698 if (substream->timer_running) 1699 snd_timer_interrupt(substream->timer, 1); 1700 _end: 1701 snd_pcm_stream_unlock_irqrestore(substream, flags); 1702 if (runtime->transfer_ack_end) 1703 runtime->transfer_ack_end(substream); 1704 kill_fasync(&runtime->fasync, SIGIO, POLL_IN); 1705} 1706 1707EXPORT_SYMBOL(snd_pcm_period_elapsed); 1708 1709/* 1710 * Wait until avail_min data becomes available 1711 * Returns a negative error code if any error occurs during operation. 1712 * The available space is stored on availp. When err = 0 and avail = 0 1713 * on the capture stream, it indicates the stream is in DRAINING state. 1714 */ 1715static int wait_for_avail(struct snd_pcm_substream *substream, 1716 snd_pcm_uframes_t *availp) 1717{ 1718 struct snd_pcm_runtime *runtime = substream->runtime; 1719 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK; 1720 wait_queue_t wait; 1721 int err = 0; 1722 snd_pcm_uframes_t avail = 0; 1723 long tout; 1724 1725 init_waitqueue_entry(&wait, current); 1726 add_wait_queue(&runtime->tsleep, &wait); 1727 for (;;) { 1728 if (signal_pending(current)) { 1729 err = -ERESTARTSYS; 1730 break; 1731 } 1732 set_current_state(TASK_INTERRUPTIBLE); 1733 snd_pcm_stream_unlock_irq(substream); 1734 tout = schedule_timeout(msecs_to_jiffies(10000)); 1735 snd_pcm_stream_lock_irq(substream); 1736 switch (runtime->status->state) { 1737 case SNDRV_PCM_STATE_SUSPENDED: 1738 err = -ESTRPIPE; 1739 goto _endloop; 1740 case SNDRV_PCM_STATE_XRUN: 1741 err = -EPIPE; 1742 goto _endloop; 1743 case SNDRV_PCM_STATE_DRAINING: 1744 if (is_playback) 1745 err = -EPIPE; 1746 else 1747 avail = 0; /* indicate draining */ 1748 goto _endloop; 1749 case SNDRV_PCM_STATE_OPEN: 1750 case SNDRV_PCM_STATE_SETUP: 1751 case SNDRV_PCM_STATE_DISCONNECTED: 1752 err = -EBADFD; 1753 goto _endloop; 1754 } 1755 if (!tout) { 1756 snd_printd("%s write error (DMA or IRQ trouble?)\n", 1757 is_playback ? "playback" : "capture"); 1758 err = -EIO; 1759 break; 1760 } 1761 if (is_playback) 1762 avail = snd_pcm_playback_avail(runtime); 1763 else 1764 avail = snd_pcm_capture_avail(runtime); 1765 if (avail >= runtime->twake) 1766 break; 1767 } 1768 _endloop: 1769 remove_wait_queue(&runtime->tsleep, &wait); 1770 *availp = avail; 1771 return err; 1772} 1773 1774static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream, 1775 unsigned int hwoff, 1776 unsigned long data, unsigned int off, 1777 snd_pcm_uframes_t frames) 1778{ 1779 struct snd_pcm_runtime *runtime = substream->runtime; 1780 int err; 1781 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); 1782 if (substream->ops->copy) { 1783 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) 1784 return err; 1785 } else { 1786 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); 1787 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames))) 1788 return -EFAULT; 1789 } 1790 return 0; 1791} 1792 1793typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff, 1794 unsigned long data, unsigned int off, 1795 snd_pcm_uframes_t size); 1796 1797static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream, 1798 unsigned long data, 1799 snd_pcm_uframes_t size, 1800 int nonblock, 1801 transfer_f transfer) 1802{ 1803 struct snd_pcm_runtime *runtime = substream->runtime; 1804 snd_pcm_uframes_t xfer = 0; 1805 snd_pcm_uframes_t offset = 0; 1806 int err = 0; 1807 1808 if (size == 0) 1809 return 0; 1810 1811 snd_pcm_stream_lock_irq(substream); 1812 switch (runtime->status->state) { 1813 case SNDRV_PCM_STATE_PREPARED: 1814 case SNDRV_PCM_STATE_RUNNING: 1815 case SNDRV_PCM_STATE_PAUSED: 1816 break; 1817 case SNDRV_PCM_STATE_XRUN: 1818 err = -EPIPE; 1819 goto _end_unlock; 1820 case SNDRV_PCM_STATE_SUSPENDED: 1821 err = -ESTRPIPE; 1822 goto _end_unlock; 1823 default: 1824 err = -EBADFD; 1825 goto _end_unlock; 1826 } 1827 1828 runtime->twake = runtime->control->avail_min ? : 1; 1829 while (size > 0) { 1830 snd_pcm_uframes_t frames, appl_ptr, appl_ofs; 1831 snd_pcm_uframes_t avail; 1832 snd_pcm_uframes_t cont; 1833 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 1834 snd_pcm_update_hw_ptr(substream); 1835 avail = snd_pcm_playback_avail(runtime); 1836 if (!avail) { 1837 if (nonblock) { 1838 err = -EAGAIN; 1839 goto _end_unlock; 1840 } 1841 runtime->twake = min_t(snd_pcm_uframes_t, size, 1842 runtime->control->avail_min ? : 1); 1843 err = wait_for_avail(substream, &avail); 1844 if (err < 0) 1845 goto _end_unlock; 1846 } 1847 frames = size > avail ? avail : size; 1848 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; 1849 if (frames > cont) 1850 frames = cont; 1851 if (snd_BUG_ON(!frames)) { 1852 runtime->twake = 0; 1853 snd_pcm_stream_unlock_irq(substream); 1854 return -EINVAL; 1855 } 1856 appl_ptr = runtime->control->appl_ptr; 1857 appl_ofs = appl_ptr % runtime->buffer_size; 1858 snd_pcm_stream_unlock_irq(substream); 1859 err = transfer(substream, appl_ofs, data, offset, frames); 1860 snd_pcm_stream_lock_irq(substream); 1861 if (err < 0) 1862 goto _end_unlock; 1863 switch (runtime->status->state) { 1864 case SNDRV_PCM_STATE_XRUN: 1865 err = -EPIPE; 1866 goto _end_unlock; 1867 case SNDRV_PCM_STATE_SUSPENDED: 1868 err = -ESTRPIPE; 1869 goto _end_unlock; 1870 default: 1871 break; 1872 } 1873 appl_ptr += frames; 1874 if (appl_ptr >= runtime->boundary) 1875 appl_ptr -= runtime->boundary; 1876 runtime->control->appl_ptr = appl_ptr; 1877 if (substream->ops->ack) 1878 substream->ops->ack(substream); 1879 1880 offset += frames; 1881 size -= frames; 1882 xfer += frames; 1883 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED && 1884 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) { 1885 err = snd_pcm_start(substream); 1886 if (err < 0) 1887 goto _end_unlock; 1888 } 1889 } 1890 _end_unlock: 1891 runtime->twake = 0; 1892 if (xfer > 0 && err >= 0) 1893 snd_pcm_update_state(substream, runtime); 1894 snd_pcm_stream_unlock_irq(substream); 1895 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; 1896} 1897 1898/* sanity-check for read/write methods */ 1899static int pcm_sanity_check(struct snd_pcm_substream *substream) 1900{ 1901 struct snd_pcm_runtime *runtime; 1902 if (PCM_RUNTIME_CHECK(substream)) 1903 return -ENXIO; 1904 runtime = substream->runtime; 1905 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area)) 1906 return -EINVAL; 1907 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 1908 return -EBADFD; 1909 return 0; 1910} 1911 1912snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size) 1913{ 1914 struct snd_pcm_runtime *runtime; 1915 int nonblock; 1916 int err; 1917 1918 err = pcm_sanity_check(substream); 1919 if (err < 0) 1920 return err; 1921 runtime = substream->runtime; 1922 nonblock = !!(substream->f_flags & O_NONBLOCK); 1923 1924 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && 1925 runtime->channels > 1) 1926 return -EINVAL; 1927 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock, 1928 snd_pcm_lib_write_transfer); 1929} 1930 1931EXPORT_SYMBOL(snd_pcm_lib_write); 1932 1933static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream, 1934 unsigned int hwoff, 1935 unsigned long data, unsigned int off, 1936 snd_pcm_uframes_t frames) 1937{ 1938 struct snd_pcm_runtime *runtime = substream->runtime; 1939 int err; 1940 void __user **bufs = (void __user **)data; 1941 int channels = runtime->channels; 1942 int c; 1943 if (substream->ops->copy) { 1944 if (snd_BUG_ON(!substream->ops->silence)) 1945 return -EINVAL; 1946 for (c = 0; c < channels; ++c, ++bufs) { 1947 if (*bufs == NULL) { 1948 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0) 1949 return err; 1950 } else { 1951 char __user *buf = *bufs + samples_to_bytes(runtime, off); 1952 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) 1953 return err; 1954 } 1955 } 1956 } else { 1957 /* default transfer behaviour */ 1958 size_t dma_csize = runtime->dma_bytes / channels; 1959 for (c = 0; c < channels; ++c, ++bufs) { 1960 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); 1961 if (*bufs == NULL) { 1962 snd_pcm_format_set_silence(runtime->format, hwbuf, frames); 1963 } else { 1964 char __user *buf = *bufs + samples_to_bytes(runtime, off); 1965 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames))) 1966 return -EFAULT; 1967 } 1968 } 1969 } 1970 return 0; 1971} 1972 1973snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream, 1974 void __user **bufs, 1975 snd_pcm_uframes_t frames) 1976{ 1977 struct snd_pcm_runtime *runtime; 1978 int nonblock; 1979 int err; 1980 1981 err = pcm_sanity_check(substream); 1982 if (err < 0) 1983 return err; 1984 runtime = substream->runtime; 1985 nonblock = !!(substream->f_flags & O_NONBLOCK); 1986 1987 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 1988 return -EINVAL; 1989 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames, 1990 nonblock, snd_pcm_lib_writev_transfer); 1991} 1992 1993EXPORT_SYMBOL(snd_pcm_lib_writev); 1994 1995static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream, 1996 unsigned int hwoff, 1997 unsigned long data, unsigned int off, 1998 snd_pcm_uframes_t frames) 1999{ 2000 struct snd_pcm_runtime *runtime = substream->runtime; 2001 int err; 2002 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); 2003 if (substream->ops->copy) { 2004 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) 2005 return err; 2006 } else { 2007 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); 2008 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames))) 2009 return -EFAULT; 2010 } 2011 return 0; 2012} 2013 2014static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream, 2015 unsigned long data, 2016 snd_pcm_uframes_t size, 2017 int nonblock, 2018 transfer_f transfer) 2019{ 2020 struct snd_pcm_runtime *runtime = substream->runtime; 2021 snd_pcm_uframes_t xfer = 0; 2022 snd_pcm_uframes_t offset = 0; 2023 int err = 0; 2024 2025 if (size == 0) 2026 return 0; 2027 2028 snd_pcm_stream_lock_irq(substream); 2029 switch (runtime->status->state) { 2030 case SNDRV_PCM_STATE_PREPARED: 2031 if (size >= runtime->start_threshold) { 2032 err = snd_pcm_start(substream); 2033 if (err < 0) 2034 goto _end_unlock; 2035 } 2036 break; 2037 case SNDRV_PCM_STATE_DRAINING: 2038 case SNDRV_PCM_STATE_RUNNING: 2039 case SNDRV_PCM_STATE_PAUSED: 2040 break; 2041 case SNDRV_PCM_STATE_XRUN: 2042 err = -EPIPE; 2043 goto _end_unlock; 2044 case SNDRV_PCM_STATE_SUSPENDED: 2045 err = -ESTRPIPE; 2046 goto _end_unlock; 2047 default: 2048 err = -EBADFD; 2049 goto _end_unlock; 2050 } 2051 2052 runtime->twake = runtime->control->avail_min ? : 1; 2053 while (size > 0) { 2054 snd_pcm_uframes_t frames, appl_ptr, appl_ofs; 2055 snd_pcm_uframes_t avail; 2056 snd_pcm_uframes_t cont; 2057 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) 2058 snd_pcm_update_hw_ptr(substream); 2059 avail = snd_pcm_capture_avail(runtime); 2060 if (!avail) { 2061 if (runtime->status->state == 2062 SNDRV_PCM_STATE_DRAINING) { 2063 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP); 2064 goto _end_unlock; 2065 } 2066 if (nonblock) { 2067 err = -EAGAIN; 2068 goto _end_unlock; 2069 } 2070 runtime->twake = min_t(snd_pcm_uframes_t, size, 2071 runtime->control->avail_min ? : 1); 2072 err = wait_for_avail(substream, &avail); 2073 if (err < 0) 2074 goto _end_unlock; 2075 if (!avail) 2076 continue; /* draining */ 2077 } 2078 frames = size > avail ? avail : size; 2079 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; 2080 if (frames > cont) 2081 frames = cont; 2082 if (snd_BUG_ON(!frames)) { 2083 runtime->twake = 0; 2084 snd_pcm_stream_unlock_irq(substream); 2085 return -EINVAL; 2086 } 2087 appl_ptr = runtime->control->appl_ptr; 2088 appl_ofs = appl_ptr % runtime->buffer_size; 2089 snd_pcm_stream_unlock_irq(substream); 2090 err = transfer(substream, appl_ofs, data, offset, frames); 2091 snd_pcm_stream_lock_irq(substream); 2092 if (err < 0) 2093 goto _end_unlock; 2094 switch (runtime->status->state) { 2095 case SNDRV_PCM_STATE_XRUN: 2096 err = -EPIPE; 2097 goto _end_unlock; 2098 case SNDRV_PCM_STATE_SUSPENDED: 2099 err = -ESTRPIPE; 2100 goto _end_unlock; 2101 default: 2102 break; 2103 } 2104 appl_ptr += frames; 2105 if (appl_ptr >= runtime->boundary) 2106 appl_ptr -= runtime->boundary; 2107 runtime->control->appl_ptr = appl_ptr; 2108 if (substream->ops->ack) 2109 substream->ops->ack(substream); 2110 2111 offset += frames; 2112 size -= frames; 2113 xfer += frames; 2114 } 2115 _end_unlock: 2116 runtime->twake = 0; 2117 if (xfer > 0 && err >= 0) 2118 snd_pcm_update_state(substream, runtime); 2119 snd_pcm_stream_unlock_irq(substream); 2120 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; 2121} 2122 2123snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size) 2124{ 2125 struct snd_pcm_runtime *runtime; 2126 int nonblock; 2127 int err; 2128 2129 err = pcm_sanity_check(substream); 2130 if (err < 0) 2131 return err; 2132 runtime = substream->runtime; 2133 nonblock = !!(substream->f_flags & O_NONBLOCK); 2134 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED) 2135 return -EINVAL; 2136 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer); 2137} 2138 2139EXPORT_SYMBOL(snd_pcm_lib_read); 2140 2141static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream, 2142 unsigned int hwoff, 2143 unsigned long data, unsigned int off, 2144 snd_pcm_uframes_t frames) 2145{ 2146 struct snd_pcm_runtime *runtime = substream->runtime; 2147 int err; 2148 void __user **bufs = (void __user **)data; 2149 int channels = runtime->channels; 2150 int c; 2151 if (substream->ops->copy) { 2152 for (c = 0; c < channels; ++c, ++bufs) { 2153 char __user *buf; 2154 if (*bufs == NULL) 2155 continue; 2156 buf = *bufs + samples_to_bytes(runtime, off); 2157 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) 2158 return err; 2159 } 2160 } else { 2161 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels; 2162 for (c = 0; c < channels; ++c, ++bufs) { 2163 char *hwbuf; 2164 char __user *buf; 2165 if (*bufs == NULL) 2166 continue; 2167 2168 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); 2169 buf = *bufs + samples_to_bytes(runtime, off); 2170 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames))) 2171 return -EFAULT; 2172 } 2173 } 2174 return 0; 2175} 2176 2177snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream, 2178 void __user **bufs, 2179 snd_pcm_uframes_t frames) 2180{ 2181 struct snd_pcm_runtime *runtime; 2182 int nonblock; 2183 int err; 2184 2185 err = pcm_sanity_check(substream); 2186 if (err < 0) 2187 return err; 2188 runtime = substream->runtime; 2189 if (runtime->status->state == SNDRV_PCM_STATE_OPEN) 2190 return -EBADFD; 2191 2192 nonblock = !!(substream->f_flags & O_NONBLOCK); 2193 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) 2194 return -EINVAL; 2195 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer); 2196} 2197 2198EXPORT_SYMBOL(snd_pcm_lib_readv); 2199