sound/core/pcm_lib.c

   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 <sound/core.h>
  26 #include <sound/control.h>
  27 #include <sound/info.h>
  28 #include <sound/pcm.h>
  29 #include <sound/pcm_params.h>
  30 #include <sound/timer.h>
  31
  32 /*
  33  * fill ring buffer with silence
  34  * runtime->silence_start: starting pointer to silence area
  35  * runtime->silence_filled: size filled with silence
  36  * runtime->silence_threshold: threshold from application
  37  * runtime->silence_size: maximal size from application
  38  *
  39  * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
  40  */
  41 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
  42 {
  43         struct snd_pcm_runtime *runtime = substream->runtime;
  44         snd_pcm_uframes_t frames, ofs, transfer;
  45
  46         if (runtime->silence_size < runtime->boundary) {
  47                 snd_pcm_sframes_t noise_dist, n;
  48                 if (runtime->silence_start != runtime->control->appl_ptr) {
  49                         n = runtime->control->appl_ptr - runtime->silence_start;
  50                         if (n < 0)
  51                                 n += runtime->boundary;
  52                         if ((snd_pcm_uframes_t)n < runtime->silence_filled)
  53                                 runtime->silence_filled -= n;
  54                         else
  55                                 runtime->silence_filled = 0;
  56                         runtime->silence_start = runtime->control->appl_ptr;
  57                 }
  58                 if (runtime->silence_filled >= runtime->buffer_size)
  59                         return;
  60                 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
  61                 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
  62                         return;
  63                 frames = runtime->silence_threshold - noise_dist;
  64                 if (frames > runtime->silence_size)
  65                         frames = runtime->silence_size;
  66         } else {
  67                 if (new_hw_ptr == ULONG_MAX) {  /* initialization */
  68                         snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
  69                         runtime->silence_filled = avail > 0 ? avail : 0;
  70                         runtime->silence_start = (runtime->status->hw_ptr +
  71                                                   runtime->silence_filled) %
  72                                                  runtime->boundary;
  73                 } else {
  74                         ofs = runtime->status->hw_ptr;
  75                         frames = new_hw_ptr - ofs;
  76                         if ((snd_pcm_sframes_t)frames < 0)
  77                                 frames += runtime->boundary;
  78                         runtime->silence_filled -= frames;
  79                         if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
  80                                 runtime->silence_filled = 0;
  81                                 runtime->silence_start = new_hw_ptr;
  82                         } else {
  83                                 runtime->silence_start = ofs;
  84                         }
  85                 }
  86                 frames = runtime->buffer_size - runtime->silence_filled;
  87         }
  88         if (snd_BUG_ON(frames > runtime->buffer_size))
  89                 return;
  90         if (frames == 0)
  91                 return;
  92         ofs = runtime->silence_start % runtime->buffer_size;
  93         while (frames > 0) {
  94                 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
  95                 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
  96                     runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
  97                         if (substream->ops->silence) {
  98                                 int err;
  99                                 err = substream->ops->silence(substream, -1, ofs, transfer);
 100                                 snd_BUG_ON(err < 0);
 101                         } else {
 102                                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
 103                                 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
 104                         }
 105                 } else {
 106                         unsigned int c;
 107                         unsigned int channels = runtime->channels;
 108                         if (substream->ops->silence) {
 109                                 for (c = 0; c < channels; ++c) {
 110                                         int err;
 111                                         err = substream->ops->silence(substream, c, ofs, transfer);
 112                                         snd_BUG_ON(err < 0);
 113                                 }
 114                         } else {
 115                                 size_t dma_csize = runtime->dma_bytes / channels;
 116                                 for (c = 0; c < channels; ++c) {
 117                                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
 118                                         snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
 119                                 }
 120                         }
 121                 }
 122                 runtime->silence_filled += transfer;
 123                 frames -= transfer;
 124                 ofs = 0;
 125         }
 126 }
 127
 128 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 129 #define xrun_debug(substream)   ((substream)->pstr->xrun_debug)
 130 #else
 131 #define xrun_debug(substream)   0
 132 #endif
 133
 134 #define dump_stack_on_xrun(substream) do {      \
 135                 if (xrun_debug(substream) > 1)  \
 136                         dump_stack();           \
 137         } while (0)
 138
 139 static void xrun(struct snd_pcm_substream *substream)
 140 {
 141         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 142         if (xrun_debug(substream)) {
 143                 snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n",
 144                            substream->pcm->card->number,
 145                            substream->pcm->device,
 146                            substream->stream ? 'c' : 'p');
 147                 dump_stack_on_xrun(substream);
 148         }
 149 }
 150
 151 static snd_pcm_uframes_t
 152 snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
 153                           struct snd_pcm_runtime *runtime)
 154 {
 155         snd_pcm_uframes_t pos;
 156
 157         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 158                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 159         pos = substream->ops->pointer(substream);
 160         if (pos == SNDRV_PCM_POS_XRUN)
 161                 return pos; /* XRUN */
 162         if (pos >= runtime->buffer_size) {
 163                 if (printk_ratelimit()) {
 164                         snd_printd(KERN_ERR  "BUG: stream = %i, pos = 0x%lx, "
 165                                    "buffer size = 0x%lx, period size = 0x%lx\n",
 166                                    substream->stream, pos, runtime->buffer_size,
 167                                    runtime->period_size);
 168                 }
 169                 pos = 0;
 170         }
 171         pos -= pos % runtime->min_align;
 172         return pos;
 173 }
 174
 175 static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
 176                                       struct snd_pcm_runtime *runtime)
 177 {
 178         snd_pcm_uframes_t avail;
 179
 180         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 181                 avail = snd_pcm_playback_avail(runtime);
 182         else
 183                 avail = snd_pcm_capture_avail(runtime);
 184         if (avail > runtime->avail_max)
 185                 runtime->avail_max = avail;
 186         if (avail >= runtime->stop_threshold) {
 187                 if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
 188                         snd_pcm_drain_done(substream);
 189                 else
 190                         xrun(substream);
 191                 return -EPIPE;
 192         }
 193         if (avail >= runtime->control->avail_min)
 194                 wake_up(&runtime->sleep);
 195         return 0;
 196 }
 197
 198 #define hw_ptr_error(substream, fmt, args...)                           \
 199         do {                                                            \
 200                 if (xrun_debug(substream)) {                            \
 201                         if (printk_ratelimit()) {                       \
 202                                 snd_printd("PCM: " fmt, ##args);        \
 203                         }                                               \
 204                         dump_stack_on_xrun(substream);                  \
 205                 }                                                       \
 206         } while (0)
 207
 208 static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 209 {
 210         struct snd_pcm_runtime *runtime = substream->runtime;
 211         snd_pcm_uframes_t pos;
 212         snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base;
 213         snd_pcm_sframes_t hdelta, delta;
 214         unsigned long jdelta;
 215
 216         old_hw_ptr = runtime->status->hw_ptr;
 217         pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 218         if (pos == SNDRV_PCM_POS_XRUN) {
 219                 xrun(substream);
 220                 return -EPIPE;
 221         }
 222         hw_base = runtime->hw_ptr_base;
 223         new_hw_ptr = hw_base + pos;
 224         hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
 225         delta = new_hw_ptr - hw_ptr_interrupt;
 226         if (hw_ptr_interrupt >= runtime->boundary) {
 227                 hw_ptr_interrupt -= runtime->boundary;
 228                 if (hw_base < runtime->boundary / 2)
 229                         /* hw_base was already lapped; recalc delta */
 230                         delta = new_hw_ptr - hw_ptr_interrupt;
 231         }
 232         if (delta < 0) {
 233                 delta += runtime->buffer_size;
 234                 if (delta < 0) {
 235                         hw_ptr_error(substream,
 236                                      "Unexpected hw_pointer value "
 237                                      "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
 238                                      substream->stream, (long)pos,
 239                                      (long)hw_ptr_interrupt);
 240                         /* rebase to interrupt position */
 241                         hw_base = new_hw_ptr = hw_ptr_interrupt;
 242                         /* align hw_base to buffer_size */
 243                         hw_base -= hw_base % runtime->buffer_size;
 244                         delta = 0;
 245                 } else {
 246                         hw_base += runtime->buffer_size;
 247                         if (hw_base >= runtime->boundary)
 248                                 hw_base = 0;
 249                         new_hw_ptr = hw_base + pos;
 250                 }
 251         }
 252
 253         /* Do jiffies check only in xrun_debug mode */
 254         if (!xrun_debug(substream))
 255                 goto no_jiffies_check;
 256
 257         /* Skip the jiffies check for hardwares with BATCH flag.
 258          * Such hardware usually just increases the position at each IRQ,
 259          * thus it can't give any strange position.
 260          */
 261         if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
 262                 goto no_jiffies_check;
 263         hdelta = new_hw_ptr - old_hw_ptr;
 264         jdelta = jiffies - runtime->hw_ptr_jiffies;
 265         if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
 266                 delta = jdelta /
 267                         (((runtime->period_size * HZ) / runtime->rate)
 268                                                                 + HZ/100);
 269                 hw_ptr_error(substream,
 270                              "hw_ptr skipping! [Q] "
 271                              "(pos=%ld, delta=%ld, period=%ld, "
 272                              "jdelta=%lu/%lu/%lu)\n",
 273                              (long)pos, (long)hdelta,
 274                              (long)runtime->period_size, jdelta,
 275                              ((hdelta * HZ) / runtime->rate), delta);
 276                 hw_ptr_interrupt = runtime->hw_ptr_interrupt +
 277                                    runtime->period_size * delta;
 278                 if (hw_ptr_interrupt >= runtime->boundary)
 279                         hw_ptr_interrupt -= runtime->boundary;
 280                 /* rebase to interrupt position */
 281                 hw_base = new_hw_ptr = hw_ptr_interrupt;
 282                 /* align hw_base to buffer_size */
 283                 hw_base -= hw_base % runtime->buffer_size;
 284                 delta = 0;
 285         }
 286  no_jiffies_check:
 287         if (delta > runtime->period_size + runtime->period_size / 2) {
 288                 hw_ptr_error(substream,
 289                              "Lost interrupts? "
 290                              "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
 291                              substream->stream, (long)delta,
 292                              (long)hw_ptr_interrupt);
 293                 /* rebase hw_ptr_interrupt */
 294                 hw_ptr_interrupt =
 295                         new_hw_ptr - new_hw_ptr % runtime->period_size;
 296         }
 297         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 298             runtime->silence_size > 0)
 299                 snd_pcm_playback_silence(substream, new_hw_ptr);
 300
 301         runtime->hw_ptr_base = hw_base;
 302         runtime->status->hw_ptr = new_hw_ptr;
 303         runtime->hw_ptr_jiffies = jiffies;
 304         runtime->hw_ptr_interrupt = hw_ptr_interrupt;
 305
 306         return snd_pcm_update_hw_ptr_post(substream, runtime);
 307 }
 308
 309 /* CAUTION: call it with irq disabled */
 310 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 311 {
 312         struct snd_pcm_runtime *runtime = substream->runtime;
 313         snd_pcm_uframes_t pos;
 314         snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
 315         snd_pcm_sframes_t delta;
 316         unsigned long jdelta;
 317
 318         old_hw_ptr = runtime->status->hw_ptr;
 319         pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 320         if (pos == SNDRV_PCM_POS_XRUN) {
 321                 xrun(substream);
 322                 return -EPIPE;
 323         }
 324         hw_base = runtime->hw_ptr_base;
 325         new_hw_ptr = hw_base + pos;
 326
 327         delta = new_hw_ptr - old_hw_ptr;
 328         jdelta = jiffies - runtime->hw_ptr_jiffies;
 329         if (delta < 0) {
 330                 delta += runtime->buffer_size;
 331                 if (delta < 0) {
 332                         hw_ptr_error(substream,
 333                                      "Unexpected hw_pointer value [2] "
 334                                      "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
 335                                      substream->stream, (long)pos,
 336                                      (long)old_hw_ptr, jdelta);
 337                         return 0;
 338                 }
 339                 hw_base += runtime->buffer_size;
 340                 if (hw_base >= runtime->boundary)
 341                         hw_base = 0;
 342                 new_hw_ptr = hw_base + pos;
 343         }
 344         /* Do jiffies check only in xrun_debug mode */
 345         if (xrun_debug(substream) &&
 346             ((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
 347                 hw_ptr_error(substream,
 348                              "hw_ptr skipping! "
 349                              "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
 350                              (long)pos, (long)delta,
 351                              (long)runtime->period_size, jdelta,
 352                              ((delta * HZ) / runtime->rate));
 353                 return 0;
 354         }
 355         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 356             runtime->silence_size > 0)
 357                 snd_pcm_playback_silence(substream, new_hw_ptr);
 358
 359         runtime->hw_ptr_base = hw_base;
 360         runtime->status->hw_ptr = new_hw_ptr;
 361         runtime->hw_ptr_jiffies = jiffies;
 362
 363         return snd_pcm_update_hw_ptr_post(substream, runtime);
 364 }
 365
 366 /**
 367  * snd_pcm_set_ops - set the PCM operators
 368  * @pcm: the pcm instance
 369  * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 370  * @ops: the operator table
 371  *
 372  * Sets the given PCM operators to the pcm instance.
 373  */
 374 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
 375 {
 376         struct snd_pcm_str *stream = &pcm->streams[direction];
 377         struct snd_pcm_substream *substream;
 378
 379         for (substream = stream->substream; substream != NULL; substream = substream->next)
 380                 substream->ops = ops;
 381 }
 382
 383 EXPORT_SYMBOL(snd_pcm_set_ops);
 384
 385 /**
 386  * snd_pcm_sync - set the PCM sync id
 387  * @substream: the pcm substream
 388  *
 389  * Sets the PCM sync identifier for the card.
 390  */
 391 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
 392 {
 393         struct snd_pcm_runtime *runtime = substream->runtime;
 394
 395         runtime->sync.id32[0] = substream->pcm->card->number;
 396         runtime->sync.id32[1] = -1;
 397         runtime->sync.id32[2] = -1;
 398         runtime->sync.id32[3] = -1;
 399 }
 400
 401 EXPORT_SYMBOL(snd_pcm_set_sync);
 402
 403 /*
 404  *  Standard ioctl routine
 405  */
 406
 407 static inline unsigned int div32(unsigned int a, unsigned int b,
 408                                  unsigned int *r)
 409 {
 410         if (b == 0) {
 411                 *r = 0;
 412                 return UINT_MAX;
 413         }
 414         *r = a % b;
 415         return a / b;
 416 }
 417
 418 static inline unsigned int div_down(unsigned int a, unsigned int b)
 419 {
 420         if (b == 0)
 421                 return UINT_MAX;
 422         return a / b;
 423 }
 424
 425 static inline unsigned int div_up(unsigned int a, unsigned int b)
 426 {
 427         unsigned int r;
 428         unsigned int q;
 429         if (b == 0)
 430                 return UINT_MAX;
 431         q = div32(a, b, &r);
 432         if (r)
 433                 ++q;
 434         return q;
 435 }
 436
 437 static inline unsigned int mul(unsigned int a, unsigned int b)
 438 {
 439         if (a == 0)
 440                 return 0;
 441         if (div_down(UINT_MAX, a) < b)
 442                 return UINT_MAX;
 443         return a * b;
 444 }
 445
 446 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
 447                                     unsigned int c, unsigned int *r)
 448 {
 449         u_int64_t n = (u_int64_t) a * b;
 450         if (c == 0) {
 451                 snd_BUG_ON(!n);
 452                 *r = 0;
 453                 return UINT_MAX;
 454         }
 455         div64_32(&n, c, r);
 456         if (n >= UINT_MAX) {
 457                 *r = 0;
 458                 return UINT_MAX;
 459         }
 460         return n;
 461 }
 462
 463 /**
 464  * snd_interval_refine - refine the interval value of configurator
 465  * @i: the interval value to refine
 466  * @v: the interval value to refer to
 467  *
 468  * Refines the interval value with the reference value.
 469  * The interval is changed to the range satisfying both intervals.
 470  * The interval status (min, max, integer, etc.) are evaluated.
 471  *
 472  * Returns non-zero if the value is changed, zero if not changed.
 473  */
 474 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
 475 {
 476         int changed = 0;
 477         if (snd_BUG_ON(snd_interval_empty(i)))
 478                 return -EINVAL;
 479         if (i->min < v->min) {
 480                 i->min = v->min;
 481                 i->openmin = v->openmin;
 482                 changed = 1;
 483         } else if (i->min == v->min && !i->openmin && v->openmin) {
 484                 i->openmin = 1;
 485                 changed = 1;
 486         }
 487         if (i->max > v->max) {
 488                 i->max = v->max;
 489                 i->openmax = v->openmax;
 490                 changed = 1;
 491         } else if (i->max == v->max && !i->openmax && v->openmax) {
 492                 i->openmax = 1;
 493                 changed = 1;
 494         }
 495         if (!i->integer && v->integer) {
 496                 i->integer = 1;
 497                 changed = 1;
 498         }
 499         if (i->integer) {
 500                 if (i->openmin) {
 501                         i->min++;
 502                         i->openmin = 0;
 503                 }
 504                 if (i->openmax) {
 505                         i->max--;
 506                         i->openmax = 0;
 507                 }
 508         } else if (!i->openmin && !i->openmax && i->min == i->max)
 509                 i->integer = 1;
 510         if (snd_interval_checkempty(i)) {
 511                 snd_interval_none(i);
 512                 return -EINVAL;
 513         }
 514         return changed;
 515 }
 516
 517 EXPORT_SYMBOL(snd_interval_refine);
 518
 519 static int snd_interval_refine_first(struct snd_interval *i)
 520 {
 521         if (snd_BUG_ON(snd_interval_empty(i)))
 522                 return -EINVAL;
 523         if (snd_interval_single(i))
 524                 return 0;
 525         i->max = i->min;
 526         i->openmax = i->openmin;
 527         if (i->openmax)
 528                 i->max++;
 529         return 1;
 530 }
 531
 532 static int snd_interval_refine_last(struct snd_interval *i)
 533 {
 534         if (snd_BUG_ON(snd_interval_empty(i)))
 535                 return -EINVAL;
 536         if (snd_interval_single(i))
 537                 return 0;
 538         i->min = i->max;
 539         i->openmin = i->openmax;
 540         if (i->openmin)
 541                 i->min--;
 542         return 1;
 543 }
 544
 545 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 546 {
 547         if (a->empty || b->empty) {
 548                 snd_interval_none(c);
 549                 return;
 550         }
 551         c->empty = 0;
 552         c->min = mul(a->min, b->min);
 553         c->openmin = (a->openmin || b->openmin);
 554         c->max = mul(a->max,  b->max);
 555         c->openmax = (a->openmax || b->openmax);
 556         c->integer = (a->integer && b->integer);
 557 }
 558
 559 /**
 560  * snd_interval_div - refine the interval value with division
 561  * @a: dividend
 562  * @b: divisor
 563  * @c: quotient
 564  *
 565  * c = a / b
 566  *
 567  * Returns non-zero if the value is changed, zero if not changed.
 568  */
 569 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 570 {
 571         unsigned int r;
 572         if (a->empty || b->empty) {
 573                 snd_interval_none(c);
 574                 return;
 575         }
 576         c->empty = 0;
 577         c->min = div32(a->min, b->max, &r);
 578         c->openmin = (r || a->openmin || b->openmax);
 579         if (b->min > 0) {
 580                 c->max = div32(a->max, b->min, &r);
 581                 if (r) {
 582                         c->max++;
 583                         c->openmax = 1;
 584                 } else
 585                         c->openmax = (a->openmax || b->openmin);
 586         } else {
 587                 c->max = UINT_MAX;
 588                 c->openmax = 0;
 589         }
 590         c->integer = 0;
 591 }
 592
 593 /**
 594  * snd_interval_muldivk - refine the interval value
 595  * @a: dividend 1
 596  * @b: dividend 2
 597  * @k: divisor (as integer)
 598  * @c: result
 599   *
 600  * c = a * b / k
 601  *
 602  * Returns non-zero if the value is changed, zero if not changed.
 603  */
 604 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 605                       unsigned int k, struct snd_interval *c)
 606 {
 607         unsigned int r;
 608         if (a->empty || b->empty) {
 609                 snd_interval_none(c);
 610                 return;
 611         }
 612         c->empty = 0;
 613         c->min = muldiv32(a->min, b->min, k, &r);
 614         c->openmin = (r || a->openmin || b->openmin);
 615         c->max = muldiv32(a->max, b->max, k, &r);
 616         if (r) {
 617                 c->max++;
 618                 c->openmax = 1;
 619         } else
 620                 c->openmax = (a->openmax || b->openmax);
 621         c->integer = 0;
 622 }
 623
 624 /**
 625  * snd_interval_mulkdiv - refine the interval value
 626  * @a: dividend 1
 627  * @k: dividend 2 (as integer)
 628  * @b: divisor
 629  * @c: result
 630  *
 631  * c = a * k / b
 632  *
 633  * Returns non-zero if the value is changed, zero if not changed.
 634  */
 635 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 636                       const struct snd_interval *b, struct snd_interval *c)
 637 {
 638         unsigned int r;
 639         if (a->empty || b->empty) {
 640                 snd_interval_none(c);
 641                 return;
 642         }
 643         c->empty = 0;
 644         c->min = muldiv32(a->min, k, b->max, &r);
 645         c->openmin = (r || a->openmin || b->openmax);
 646         if (b->min > 0) {
 647                 c->max = muldiv32(a->max, k, b->min, &r);
 648                 if (r) {
 649                         c->max++;
 650                         c->openmax = 1;
 651                 } else
 652                         c->openmax = (a->openmax || b->openmin);
 653         } else {
 654                 c->max = UINT_MAX;
 655                 c->openmax = 0;
 656         }
 657         c->integer = 0;
 658 }
 659
 660 /* ---- */
 661
 662
 663 /**
 664  * snd_interval_ratnum - refine the interval value
 665  * @i: interval to refine
 666  * @rats_count: number of ratnum_t
 667  * @rats: ratnum_t array
 668  * @nump: pointer to store the resultant numerator
 669  * @denp: pointer to store the resultant denominator
 670  *
 671  * Returns non-zero if the value is changed, zero if not changed.
 672  */
 673 int snd_interval_ratnum(struct snd_interval *i,
 674                         unsigned int rats_count, struct snd_ratnum *rats,
 675                         unsigned int *nump, unsigned int *denp)
 676 {
 677         unsigned int best_num, best_diff, best_den;
 678         unsigned int k;
 679         struct snd_interval t;
 680         int err;
 681
 682         best_num = best_den = best_diff = 0;
 683         for (k = 0; k < rats_count; ++k) {
 684                 unsigned int num = rats[k].num;
 685                 unsigned int den;
 686                 unsigned int q = i->min;
 687                 int diff;
 688                 if (q == 0)
 689                         q = 1;
 690                 den = div_down(num, q);
 691                 if (den < rats[k].den_min)
 692                         continue;
 693                 if (den > rats[k].den_max)
 694                         den = rats[k].den_max;
 695                 else {
 696                         unsigned int r;
 697                         r = (den - rats[k].den_min) % rats[k].den_step;
 698                         if (r != 0)
 699                                 den -= r;
 700                 }
 701                 diff = num - q * den;
 702                 if (best_num == 0 ||
 703                     diff * best_den < best_diff * den) {
 704                         best_diff = diff;
 705                         best_den = den;
 706                         best_num = num;
 707                 }
 708         }
 709         if (best_den == 0) {
 710                 i->empty = 1;
 711                 return -EINVAL;
 712         }
 713         t.min = div_down(best_num, best_den);
 714         t.openmin = !!(best_num % best_den);
 715
 716         best_num = best_den = best_diff = 0;
 717         for (k = 0; k < rats_count; ++k) {
 718                 unsigned int num = rats[k].num;
 719                 unsigned int den;
 720                 unsigned int q = i->max;
 721                 int diff;
 722                 if (q == 0) {
 723                         i->empty = 1;
 724                         return -EINVAL;
 725                 }
 726                 den = div_up(num, q);
 727                 if (den > rats[k].den_max)
 728                         continue;
 729                 if (den < rats[k].den_min)
 730                         den = rats[k].den_min;
 731                 else {
 732                         unsigned int r;
 733                         r = (den - rats[k].den_min) % rats[k].den_step;
 734                         if (r != 0)
 735                                 den += rats[k].den_step - r;
 736                 }
 737                 diff = q * den - num;
 738                 if (best_num == 0 ||
 739                     diff * best_den < best_diff * den) {
 740                         best_diff = diff;
 741                         best_den = den;
 742                         best_num = num;
 743                 }
 744         }
 745         if (best_den == 0) {
 746                 i->empty = 1;
 747                 return -EINVAL;
 748         }
 749         t.max = div_up(best_num, best_den);
 750         t.openmax = !!(best_num % best_den);
 751         t.integer = 0;
 752         err = snd_interval_refine(i, &t);
 753         if (err < 0)
 754                 return err;
 755
 756         if (snd_interval_single(i)) {
 757                 if (nump)
 758                         *nump = best_num;
 759                 if (denp)
 760                         *denp = best_den;
 761         }
 762         return err;
 763 }
 764
 765 EXPORT_SYMBOL(snd_interval_ratnum);
 766
 767 /**
 768  * snd_interval_ratden - refine the interval value
 769  * @i: interval to refine
 770  * @rats_count: number of struct ratden
 771  * @rats: struct ratden array
 772  * @nump: pointer to store the resultant numerator
 773  * @denp: pointer to store the resultant denominator
 774  *
 775  * Returns non-zero if the value is changed, zero if not changed.
 776  */
 777 static int snd_interval_ratden(struct snd_interval *i,
 778                                unsigned int rats_count, struct snd_ratden *rats,
 779                                unsigned int *nump, unsigned int *denp)
 780 {
 781         unsigned int best_num, best_diff, best_den;
 782         unsigned int k;
 783         struct snd_interval t;
 784         int err;
 785
 786         best_num = best_den = best_diff = 0;
 787         for (k = 0; k < rats_count; ++k) {
 788                 unsigned int num;
 789                 unsigned int den = rats[k].den;
 790                 unsigned int q = i->min;
 791                 int diff;
 792                 num = mul(q, den);
 793                 if (num > rats[k].num_max)
 794                         continue;
 795                 if (num < rats[k].num_min)
 796                         num = rats[k].num_max;
 797                 else {
 798                         unsigned int r;
 799                         r = (num - rats[k].num_min) % rats[k].num_step;
 800                         if (r != 0)
 801                                 num += rats[k].num_step - r;
 802                 }
 803                 diff = num - q * den;
 804                 if (best_num == 0 ||
 805                     diff * best_den < best_diff * den) {
 806                         best_diff = diff;
 807                         best_den = den;
 808                         best_num = num;
 809                 }
 810         }
 811         if (best_den == 0) {
 812                 i->empty = 1;
 813                 return -EINVAL;
 814         }
 815         t.min = div_down(best_num, best_den);
 816         t.openmin = !!(best_num % best_den);
 817
 818         best_num = best_den = best_diff = 0;
 819         for (k = 0; k < rats_count; ++k) {
 820                 unsigned int num;
 821                 unsigned int den = rats[k].den;
 822                 unsigned int q = i->max;
 823                 int diff;
 824                 num = mul(q, den);
 825                 if (num < rats[k].num_min)
 826                         continue;
 827                 if (num > rats[k].num_max)
 828                         num = rats[k].num_max;
 829                 else {
 830                         unsigned int r;
 831                         r = (num - rats[k].num_min) % rats[k].num_step;
 832                         if (r != 0)
 833                                 num -= r;
 834                 }
 835                 diff = q * den - num;
 836                 if (best_num == 0 ||
 837                     diff * best_den < best_diff * den) {
 838                         best_diff = diff;
 839                         best_den = den;
 840                         best_num = num;
 841                 }
 842         }
 843         if (best_den == 0) {
 844                 i->empty = 1;
 845                 return -EINVAL;
 846         }
 847         t.max = div_up(best_num, best_den);
 848         t.openmax = !!(best_num % best_den);
 849         t.integer = 0;
 850         err = snd_interval_refine(i, &t);
 851         if (err < 0)
 852                 return err;
 853
 854         if (snd_interval_single(i)) {
 855                 if (nump)
 856                         *nump = best_num;
 857                 if (denp)
 858                         *denp = best_den;
 859         }
 860         return err;
 861 }
 862
 863 /**
 864  * snd_interval_list - refine the interval value from the list
 865  * @i: the interval value to refine
 866  * @count: the number of elements in the list
 867  * @list: the value list
 868  * @mask: the bit-mask to evaluate
 869  *
 870  * Refines the interval value from the list.
 871  * When mask is non-zero, only the elements corresponding to bit 1 are
 872  * evaluated.
 873  *
 874  * Returns non-zero if the value is changed, zero if not changed.
 875  */
 876 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
 877 {
 878         unsigned int k;
 879         int changed = 0;
 880
 881         if (!count) {
 882                 i->empty = 1;
 883                 return -EINVAL;
 884         }
 885         for (k = 0; k < count; k++) {
 886                 if (mask && !(mask & (1 << k)))
 887                         continue;
 888                 if (i->min == list[k] && !i->openmin)
 889                         goto _l1;
 890                 if (i->min < list[k]) {
 891                         i->min = list[k];
 892                         i->openmin = 0;
 893                         changed = 1;
 894                         goto _l1;
 895                 }
 896         }
 897         i->empty = 1;
 898         return -EINVAL;
 899  _l1:
 900         for (k = count; k-- > 0;) {
 901                 if (mask && !(mask & (1 << k)))
 902                         continue;
 903                 if (i->max == list[k] && !i->openmax)
 904                         goto _l2;
 905                 if (i->max > list[k]) {
 906                         i->max = list[k];
 907                         i->openmax = 0;
 908                         changed = 1;
 909                         goto _l2;
 910                 }
 911         }
 912         i->empty = 1;
 913         return -EINVAL;
 914  _l2:
 915         if (snd_interval_checkempty(i)) {
 916                 i->empty = 1;
 917                 return -EINVAL;
 918         }
 919         return changed;
 920 }
 921
 922 EXPORT_SYMBOL(snd_interval_list);
 923
 924 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
 925 {
 926         unsigned int n;
 927         int changed = 0;
 928         n = (i->min - min) % step;
 929         if (n != 0 || i->openmin) {
 930                 i->min += step - n;
 931                 changed = 1;
 932         }
 933         n = (i->max - min) % step;
 934         if (n != 0 || i->openmax) {
 935                 i->max -= n;
 936                 changed = 1;
 937         }
 938         if (snd_interval_checkempty(i)) {
 939                 i->empty = 1;
 940                 return -EINVAL;
 941         }
 942         return changed;
 943 }
 944
 945 /* Info constraints helpers */
 946
 947 /**
 948  * snd_pcm_hw_rule_add - add the hw-constraint rule
 949  * @runtime: the pcm runtime instance
 950  * @cond: condition bits
 951  * @var: the variable to evaluate
 952  * @func: the evaluation function
 953  * @private: the private data pointer passed to function
 954  * @dep: the dependent variables
 955  *
 956  * Returns zero if successful, or a negative error code on failure.
 957  */
 958 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
 959                         int var,
 960                         snd_pcm_hw_rule_func_t func, void *private,
 961                         int dep, ...)
 962 {
 963         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
 964         struct snd_pcm_hw_rule *c;
 965         unsigned int k;
 966         va_list args;
 967         va_start(args, dep);
 968         if (constrs->rules_num >= constrs->rules_all) {
 969                 struct snd_pcm_hw_rule *new;
 970                 unsigned int new_rules = constrs->rules_all + 16;
 971                 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
 972                 if (!new)
 973                         return -ENOMEM;
 974                 if (constrs->rules) {
 975                         memcpy(new, constrs->rules,
 976                                constrs->rules_num * sizeof(*c));
 977                         kfree(constrs->rules);
 978                 }
 979                 constrs->rules = new;
 980                 constrs->rules_all = new_rules;
 981         }
 982         c = &constrs->rules[constrs->rules_num];
 983         c->cond = cond;
 984         c->func = func;
 985         c->var = var;
 986         c->private = private;
 987         k = 0;
 988         while (1) {
 989                 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
 990                         return -EINVAL;
 991                 c->deps[k++] = dep;
 992                 if (dep < 0)
 993                         break;
 994                 dep = va_arg(args, int);
 995         }
 996         constrs->rules_num++;
 997         va_end(args);
 998         return 0;
 999 }
1000
1001 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1002
1003 /**
1004  * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1005  * @runtime: PCM runtime instance
1006  * @var: hw_params variable to apply the mask
1007  * @mask: the bitmap mask
1008  *
1009  * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1010  */
1011 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1012                                u_int32_t mask)
1013 {
1014         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1015         struct snd_mask *maskp = constrs_mask(constrs, var);
1016         *maskp->bits &= mask;
1017         memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1018         if (*maskp->bits == 0)
1019                 return -EINVAL;
1020         return 0;
1021 }
1022
1023 /**
1024  * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1025  * @runtime: PCM runtime instance
1026  * @var: hw_params variable to apply the mask
1027  * @mask: the 64bit bitmap mask
1028  *
1029  * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1030  */
1031 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1032                                  u_int64_t mask)
1033 {
1034         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1035         struct snd_mask *maskp = constrs_mask(constrs, var);
1036         maskp->bits[0] &= (u_int32_t)mask;
1037         maskp->bits[1] &= (u_int32_t)(mask >> 32);
1038         memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1039         if (! maskp->bits[0] && ! maskp->bits[1])
1040                 return -EINVAL;
1041         return 0;
1042 }
1043
1044 /**
1045  * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1046  * @runtime: PCM runtime instance
1047  * @var: hw_params variable to apply the integer constraint
1048  *
1049  * Apply the constraint of integer to an interval parameter.
1050  */
1051 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1052 {
1053         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1054         return snd_interval_setinteger(constrs_interval(constrs, var));
1055 }
1056
1057 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1058
1059 /**
1060  * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1061  * @runtime: PCM runtime instance
1062  * @var: hw_params variable to apply the range
1063  * @min: the minimal value
1064  * @max: the maximal value
1065  *
1066  * Apply the min/max range constraint to an interval parameter.
1067  */
1068 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1069                                  unsigned int min, unsigned int max)
1070 {
1071         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1072         struct snd_interval t;
1073         t.min = min;
1074         t.max = max;
1075         t.openmin = t.openmax = 0;
1076         t.integer = 0;
1077         return snd_interval_refine(constrs_interval(constrs, var), &t);
1078 }
1079
1080 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1081
1082 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1083                                 struct snd_pcm_hw_rule *rule)
1084 {
1085         struct snd_pcm_hw_constraint_list *list = rule->private;
1086         return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1087 }
1088
1089
1090 /**
1091  * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1092  * @runtime: PCM runtime instance
1093  * @cond: condition bits
1094  * @var: hw_params variable to apply the list constraint
1095  * @l: list
1096  *
1097  * Apply the list of constraints to an interval parameter.
1098  */
1099 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1100                                unsigned int cond,
1101                                snd_pcm_hw_param_t var,
1102                                struct snd_pcm_hw_constraint_list *l)
1103 {
1104         return snd_pcm_hw_rule_add(runtime, cond, var,
1105                                    snd_pcm_hw_rule_list, l,
1106                                    var, -1);
1107 }
1108
1109 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1110
1111 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1112                                    struct snd_pcm_hw_rule *rule)
1113 {
1114         struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1115         unsigned int num = 0, den = 0;
1116         int err;
1117         err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1118                                   r->nrats, r->rats, &num, &den);
1119         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1120                 params->rate_num = num;
1121                 params->rate_den = den;
1122         }
1123         return err;
1124 }
1125
1126 /**
1127  * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1128  * @runtime: PCM runtime instance
1129  * @cond: condition bits
1130  * @var: hw_params variable to apply the ratnums constraint
1131  * @r: struct snd_ratnums constriants
1132  */
1133 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1134                                   unsigned int cond,
1135                                   snd_pcm_hw_param_t var,
1136                                   struct snd_pcm_hw_constraint_ratnums *r)
1137 {
1138         return snd_pcm_hw_rule_add(runtime, cond, var,
1139                                    snd_pcm_hw_rule_ratnums, r,
1140                                    var, -1);
1141 }
1142
1143 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1144
1145 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1146                                    struct snd_pcm_hw_rule *rule)
1147 {
1148         struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1149         unsigned int num = 0, den = 0;
1150         int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1151                                   r->nrats, r->rats, &num, &den);
1152         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1153                 params->rate_num = num;
1154                 params->rate_den = den;
1155         }
1156         return err;
1157 }
1158
1159 /**
1160  * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1161  * @runtime: PCM runtime instance
1162  * @cond: condition bits
1163  * @var: hw_params variable to apply the ratdens constraint
1164  * @r: struct snd_ratdens constriants
1165  */
1166 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1167                                   unsigned int cond,
1168                                   snd_pcm_hw_param_t var,
1169                                   struct snd_pcm_hw_constraint_ratdens *r)
1170 {
1171         return snd_pcm_hw_rule_add(runtime, cond, var,
1172                                    snd_pcm_hw_rule_ratdens, r,
1173                                    var, -1);
1174 }
1175
1176 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1177
1178 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1179                                   struct snd_pcm_hw_rule *rule)
1180 {
1181         unsigned int l = (unsigned long) rule->private;
1182         int width = l & 0xffff;
1183         unsigned int msbits = l >> 16;
1184         struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1185         if (snd_interval_single(i) && snd_interval_value(i) == width)
1186                 params->msbits = msbits;
1187         return 0;
1188 }
1189
1190 /**
1191  * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1192  * @runtime: PCM runtime instance
1193  * @cond: condition bits
1194  * @width: sample bits width
1195  * @msbits: msbits width
1196  */
1197 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1198                                  unsigned int cond,
1199                                  unsigned int width,
1200                                  unsigned int msbits)
1201 {
1202         unsigned long l = (msbits << 16) | width;
1203         return snd_pcm_hw_rule_add(runtime, cond, -1,
1204                                     snd_pcm_hw_rule_msbits,
1205                                     (void*) l,
1206                                     SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1207 }
1208
1209 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1210
1211 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1212                                 struct snd_pcm_hw_rule *rule)
1213 {
1214         unsigned long step = (unsigned long) rule->private;
1215         return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1216 }
1217
1218 /**
1219  * snd_pcm_hw_constraint_step - add a hw constraint step rule
1220  * @runtime: PCM runtime instance
1221  * @cond: condition bits
1222  * @var: hw_params variable to apply the step constraint
1223  * @step: step size
1224  */
1225 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1226                                unsigned int cond,
1227                                snd_pcm_hw_param_t var,
1228                                unsigned long step)
1229 {
1230         return snd_pcm_hw_rule_add(runtime, cond, var,
1231                                    snd_pcm_hw_rule_step, (void *) step,
1232                                    var, -1);
1233 }
1234
1235 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1236
1237 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1238 {
1239         static unsigned int pow2_sizes[] = {
1240                 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1241                 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1242                 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1243                 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1244         };
1245         return snd_interval_list(hw_param_interval(params, rule->var),
1246                                  ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1247 }
1248
1249 /**
1250  * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1251  * @runtime: PCM runtime instance
1252  * @cond: condition bits
1253  * @var: hw_params variable to apply the power-of-2 constraint
1254  */
1255 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1256                                unsigned int cond,
1257                                snd_pcm_hw_param_t var)
1258 {
1259         return snd_pcm_hw_rule_add(runtime, cond, var,
1260                                    snd_pcm_hw_rule_pow2, NULL,
1261                                    var, -1);
1262 }
1263
1264 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1265
1266 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1267                                   snd_pcm_hw_param_t var)
1268 {
1269         if (hw_is_mask(var)) {
1270                 snd_mask_any(hw_param_mask(params, var));
1271                 params->cmask |= 1 << var;
1272                 params->rmask |= 1 << var;
1273                 return;
1274         }
1275         if (hw_is_interval(var)) {
1276                 snd_interval_any(hw_param_interval(params, var));
1277                 params->cmask |= 1 << var;
1278                 params->rmask |= 1 << var;
1279                 return;
1280         }
1281         snd_BUG();
1282 }
1283
1284 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1285 {
1286         unsigned int k;
1287         memset(params, 0, sizeof(*params));
1288         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1289                 _snd_pcm_hw_param_any(params, k);
1290         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1291                 _snd_pcm_hw_param_any(params, k);
1292         params->info = ~0U;
1293 }
1294
1295 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1296
1297 /**
1298  * snd_pcm_hw_param_value - return @params field @var value
1299  * @params: the hw_params instance
1300  * @var: parameter to retrieve
1301  * @dir: pointer to the direction (-1,0,1) or %NULL
1302  *
1303  * Return the value for field @var if it's fixed in configuration space
1304  * defined by @params. Return -%EINVAL otherwise.
1305  */
1306 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1307                            snd_pcm_hw_param_t var, int *dir)
1308 {
1309         if (hw_is_mask(var)) {
1310                 const struct snd_mask *mask = hw_param_mask_c(params, var);
1311                 if (!snd_mask_single(mask))
1312                         return -EINVAL;
1313                 if (dir)
1314                         *dir = 0;
1315                 return snd_mask_value(mask);
1316         }
1317         if (hw_is_interval(var)) {
1318                 const struct snd_interval *i = hw_param_interval_c(params, var);
1319                 if (!snd_interval_single(i))
1320                         return -EINVAL;
1321                 if (dir)
1322                         *dir = i->openmin;
1323                 return snd_interval_value(i);
1324         }
1325         return -EINVAL;
1326 }
1327
1328 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1329
1330 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1331                                 snd_pcm_hw_param_t var)
1332 {
1333         if (hw_is_mask(var)) {
1334                 snd_mask_none(hw_param_mask(params, var));
1335                 params->cmask |= 1 << var;
1336                 params->rmask |= 1 << var;
1337         } else if (hw_is_interval(var)) {
1338                 snd_interval_none(hw_param_interval(params, var));
1339                 params->cmask |= 1 << var;
1340                 params->rmask |= 1 << var;
1341         } else {
1342                 snd_BUG();
1343         }
1344 }
1345
1346 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1347
1348 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1349                                    snd_pcm_hw_param_t var)
1350 {
1351         int changed;
1352         if (hw_is_mask(var))
1353                 changed = snd_mask_refine_first(hw_param_mask(params, var));
1354         else if (hw_is_interval(var))
1355                 changed = snd_interval_refine_first(hw_param_interval(params, var));
1356         else
1357                 return -EINVAL;
1358         if (changed) {
1359                 params->cmask |= 1 << var;
1360                 params->rmask |= 1 << var;
1361         }
1362         return changed;
1363 }
1364
1365
1366 /**
1367  * snd_pcm_hw_param_first - refine config space and return minimum value
1368  * @pcm: PCM instance
1369  * @params: the hw_params instance
1370  * @var: parameter to retrieve
1371  * @dir: pointer to the direction (-1,0,1) or %NULL
1372  *
1373  * Inside configuration space defined by @params remove from @var all
1374  * values > minimum. Reduce configuration space accordingly.
1375  * Return the minimum.
1376  */
1377 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1378                            struct snd_pcm_hw_params *params,
1379                            snd_pcm_hw_param_t var, int *dir)
1380 {
1381         int changed = _snd_pcm_hw_param_first(params, var);
1382         if (changed < 0)
1383                 return changed;
1384         if (params->rmask) {
1385                 int err = snd_pcm_hw_refine(pcm, params);
1386                 if (snd_BUG_ON(err < 0))
1387                         return err;
1388         }
1389         return snd_pcm_hw_param_value(params, var, dir);
1390 }
1391
1392 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1393
1394 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1395                                   snd_pcm_hw_param_t var)
1396 {
1397         int changed;
1398         if (hw_is_mask(var))
1399                 changed = snd_mask_refine_last(hw_param_mask(params, var));
1400         else if (hw_is_interval(var))
1401                 changed = snd_interval_refine_last(hw_param_interval(params, var));
1402         else
1403                 return -EINVAL;
1404         if (changed) {
1405                 params->cmask |= 1 << var;
1406                 params->rmask |= 1 << var;
1407         }
1408         return changed;
1409 }
1410
1411
1412 /**
1413  * snd_pcm_hw_param_last - refine config space and return maximum value
1414  * @pcm: PCM instance
1415  * @params: the hw_params instance
1416  * @var: parameter to retrieve
1417  * @dir: pointer to the direction (-1,0,1) or %NULL
1418  *
1419  * Inside configuration space defined by @params remove from @var all
1420  * values < maximum. Reduce configuration space accordingly.
1421  * Return the maximum.
1422  */
1423 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1424                           struct snd_pcm_hw_params *params,
1425                           snd_pcm_hw_param_t var, int *dir)
1426 {
1427         int changed = _snd_pcm_hw_param_last(params, var);
1428         if (changed < 0)
1429                 return changed;
1430         if (params->rmask) {
1431                 int err = snd_pcm_hw_refine(pcm, params);
1432                 if (snd_BUG_ON(err < 0))
1433                         return err;
1434         }
1435         return snd_pcm_hw_param_value(params, var, dir);
1436 }
1437
1438 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1439
1440 /**
1441  * snd_pcm_hw_param_choose - choose a configuration defined by @params
1442  * @pcm: PCM instance
1443  * @params: the hw_params instance
1444  *
1445  * Choose one configuration from configuration space defined by @params.
1446  * The configuration chosen is that obtained fixing in this order:
1447  * first access, first format, first subformat, min channels,
1448  * min rate, min period time, max buffer size, min tick time
1449  */
1450 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1451                              struct snd_pcm_hw_params *params)
1452 {
1453         static int vars[] = {
1454                 SNDRV_PCM_HW_PARAM_ACCESS,
1455                 SNDRV_PCM_HW_PARAM_FORMAT,
1456                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1457                 SNDRV_PCM_HW_PARAM_CHANNELS,
1458                 SNDRV_PCM_HW_PARAM_RATE,
1459                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1460                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1461                 SNDRV_PCM_HW_PARAM_TICK_TIME,
1462                 -1
1463         };
1464         int err, *v;
1465
1466         for (v = vars; *v != -1; v++) {
1467                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1468                         err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1469                 else
1470                         err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1471                 if (snd_BUG_ON(err < 0))
1472                         return err;
1473         }
1474         return 0;
1475 }
1476
1477 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1478                                    void *arg)
1479 {
1480         struct snd_pcm_runtime *runtime = substream->runtime;
1481         unsigned long flags;
1482         snd_pcm_stream_lock_irqsave(substream, flags);
1483         if (snd_pcm_running(substream) &&
1484             snd_pcm_update_hw_ptr(substream) >= 0)
1485                 runtime->status->hw_ptr %= runtime->buffer_size;
1486         else
1487                 runtime->status->hw_ptr = 0;
1488         snd_pcm_stream_unlock_irqrestore(substream, flags);
1489         return 0;
1490 }
1491
1492 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1493                                           void *arg)
1494 {
1495         struct snd_pcm_channel_info *info = arg;
1496         struct snd_pcm_runtime *runtime = substream->runtime;
1497         int width;
1498         if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1499                 info->offset = -1;
1500                 return 0;
1501         }
1502         width = snd_pcm_format_physical_width(runtime->format);
1503         if (width < 0)
1504                 return width;
1505         info->offset = 0;
1506         switch (runtime->access) {
1507         case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1508         case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1509                 info->first = info->channel * width;
1510                 info->step = runtime->channels * width;
1511                 break;
1512         case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1513         case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1514         {
1515                 size_t size = runtime->dma_bytes / runtime->channels;
1516                 info->first = info->channel * size * 8;
1517                 info->step = width;
1518                 break;
1519         }
1520         default:
1521                 snd_BUG();
1522                 break;
1523         }
1524         return 0;
1525 }
1526
1527 /**
1528  * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1529  * @substream: the pcm substream instance
1530  * @cmd: ioctl command
1531  * @arg: ioctl argument
1532  *
1533  * Processes the generic ioctl commands for PCM.
1534  * Can be passed as the ioctl callback for PCM ops.
1535  *
1536  * Returns zero if successful, or a negative error code on failure.
1537  */
1538 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1539                       unsigned int cmd, void *arg)
1540 {
1541         switch (cmd) {
1542         case SNDRV_PCM_IOCTL1_INFO:
1543                 return 0;
1544         case SNDRV_PCM_IOCTL1_RESET:
1545                 return snd_pcm_lib_ioctl_reset(substream, arg);
1546         case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1547                 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1548         }
1549         return -ENXIO;
1550 }
1551
1552 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1553
1554 /**
1555  * snd_pcm_period_elapsed - update the pcm status for the next period
1556  * @substream: the pcm substream instance
1557  *
1558  * This function is called from the interrupt handler when the
1559  * PCM has processed the period size.  It will update the current
1560  * pointer, wake up sleepers, etc.
1561  *
1562  * Even if more than one periods have elapsed since the last call, you
1563  * have to call this only once.
1564  */
1565 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1566 {
1567         struct snd_pcm_runtime *runtime;
1568         unsigned long flags;
1569
1570         if (PCM_RUNTIME_CHECK(substream))
1571                 return;
1572         runtime = substream->runtime;
1573
1574         if (runtime->transfer_ack_begin)
1575                 runtime->transfer_ack_begin(substream);
1576
1577         snd_pcm_stream_lock_irqsave(substream, flags);
1578         if (!snd_pcm_running(substream) ||
1579             snd_pcm_update_hw_ptr_interrupt(substream) < 0)
1580                 goto _end;
1581
1582         if (substream->timer_running)
1583                 snd_timer_interrupt(substream->timer, 1);
1584  _end:
1585         snd_pcm_stream_unlock_irqrestore(substream, flags);
1586         if (runtime->transfer_ack_end)
1587                 runtime->transfer_ack_end(substream);
1588         kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1589 }
1590
1591 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1592
1593 /*
1594  * Wait until avail_min data becomes available
1595  * Returns a negative error code if any error occurs during operation.
1596  * The available space is stored on availp.  When err = 0 and avail = 0
1597  * on the capture stream, it indicates the stream is in DRAINING state.
1598  */
1599 static int wait_for_avail_min(struct snd_pcm_substream *substream,
1600                               snd_pcm_uframes_t *availp)
1601 {
1602         struct snd_pcm_runtime *runtime = substream->runtime;
1603         int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1604         wait_queue_t wait;
1605         int err = 0;
1606         snd_pcm_uframes_t avail = 0;
1607         long tout;
1608
1609         init_waitqueue_entry(&wait, current);
1610         add_wait_queue(&runtime->sleep, &wait);
1611         for (;;) {
1612                 if (signal_pending(current)) {
1613                         err = -ERESTARTSYS;
1614                         break;
1615                 }
1616                 set_current_state(TASK_INTERRUPTIBLE);
1617                 snd_pcm_stream_unlock_irq(substream);
1618                 tout = schedule_timeout(msecs_to_jiffies(10000));
1619                 snd_pcm_stream_lock_irq(substream);
1620                 switch (runtime->status->state) {
1621                 case SNDRV_PCM_STATE_SUSPENDED:
1622                         err = -ESTRPIPE;
1623                         goto _endloop;
1624                 case SNDRV_PCM_STATE_XRUN:
1625                         err = -EPIPE;
1626                         goto _endloop;
1627                 case SNDRV_PCM_STATE_DRAINING:
1628                         if (is_playback)
1629                                 err = -EPIPE;
1630                         else
1631                                 avail = 0; /* indicate draining */
1632                         goto _endloop;
1633                 case SNDRV_PCM_STATE_OPEN:
1634                 case SNDRV_PCM_STATE_SETUP:
1635                 case SNDRV_PCM_STATE_DISCONNECTED:
1636                         err = -EBADFD;
1637                         goto _endloop;
1638                 }
1639                 if (!tout) {
1640                         snd_printd("%s write error (DMA or IRQ trouble?)\n",
1641                                    is_playback ? "playback" : "capture");
1642                         err = -EIO;
1643                         break;
1644                 }
1645                 if (is_playback)
1646                         avail = snd_pcm_playback_avail(runtime);
1647                 else
1648                         avail = snd_pcm_capture_avail(runtime);
1649                 if (avail >= runtime->control->avail_min)
1650                         break;
1651         }
1652  _endloop:
1653         remove_wait_queue(&runtime->sleep, &wait);
1654         *availp = avail;
1655         return err;
1656 }
1657
1658 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1659                                       unsigned int hwoff,
1660                                       unsigned long data, unsigned int off,
1661                                       snd_pcm_uframes_t frames)
1662 {
1663         struct snd_pcm_runtime *runtime = substream->runtime;
1664         int err;
1665         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1666         if (substream->ops->copy) {
1667                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1668                         return err;
1669         } else {
1670                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1671                 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1672                         return -EFAULT;
1673         }
1674         return 0;
1675 }
1676
1677 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1678                           unsigned long data, unsigned int off,
1679                           snd_pcm_uframes_t size);
1680
1681 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1682                                             unsigned long data,
1683                                             snd_pcm_uframes_t size,
1684                                             int nonblock,
1685                                             transfer_f transfer)
1686 {
1687         struct snd_pcm_runtime *runtime = substream->runtime;
1688         snd_pcm_uframes_t xfer = 0;
1689         snd_pcm_uframes_t offset = 0;
1690         int err = 0;
1691
1692         if (size == 0)
1693                 return 0;
1694
1695         snd_pcm_stream_lock_irq(substream);
1696         switch (runtime->status->state) {
1697         case SNDRV_PCM_STATE_PREPARED:
1698         case SNDRV_PCM_STATE_RUNNING:
1699         case SNDRV_PCM_STATE_PAUSED:
1700                 break;
1701         case SNDRV_PCM_STATE_XRUN:
1702                 err = -EPIPE;
1703                 goto _end_unlock;
1704         case SNDRV_PCM_STATE_SUSPENDED:
1705                 err = -ESTRPIPE;
1706                 goto _end_unlock;
1707         default:
1708                 err = -EBADFD;
1709                 goto _end_unlock;
1710         }
1711
1712         while (size > 0) {
1713                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1714                 snd_pcm_uframes_t avail;
1715                 snd_pcm_uframes_t cont;
1716                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1717                         snd_pcm_update_hw_ptr(substream);
1718                 avail = snd_pcm_playback_avail(runtime);
1719                 if (!avail) {
1720                         if (nonblock) {
1721                                 err = -EAGAIN;
1722                                 goto _end_unlock;
1723                         }
1724                         err = wait_for_avail_min(substream, &avail);
1725                         if (err < 0)
1726                                 goto _end_unlock;
1727                 }
1728                 frames = size > avail ? avail : size;
1729                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1730                 if (frames > cont)
1731                         frames = cont;
1732                 if (snd_BUG_ON(!frames)) {
1733                         snd_pcm_stream_unlock_irq(substream);
1734                         return -EINVAL;
1735                 }
1736                 appl_ptr = runtime->control->appl_ptr;
1737                 appl_ofs = appl_ptr % runtime->buffer_size;
1738                 snd_pcm_stream_unlock_irq(substream);
1739                 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
1740                         goto _end;
1741                 snd_pcm_stream_lock_irq(substream);
1742                 switch (runtime->status->state) {
1743                 case SNDRV_PCM_STATE_XRUN:
1744                         err = -EPIPE;
1745                         goto _end_unlock;
1746                 case SNDRV_PCM_STATE_SUSPENDED:
1747                         err = -ESTRPIPE;
1748                         goto _end_unlock;
1749                 default:
1750                         break;
1751                 }
1752                 appl_ptr += frames;
1753                 if (appl_ptr >= runtime->boundary)
1754                         appl_ptr -= runtime->boundary;
1755                 runtime->control->appl_ptr = appl_ptr;
1756                 if (substream->ops->ack)
1757                         substream->ops->ack(substream);
1758
1759                 offset += frames;
1760                 size -= frames;
1761                 xfer += frames;
1762                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1763                     snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1764                         err = snd_pcm_start(substream);
1765                         if (err < 0)
1766                                 goto _end_unlock;
1767                 }
1768         }
1769  _end_unlock:
1770         snd_pcm_stream_unlock_irq(substream);
1771  _end:
1772         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1773 }
1774
1775 /* sanity-check for read/write methods */
1776 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1777 {
1778         struct snd_pcm_runtime *runtime;
1779         if (PCM_RUNTIME_CHECK(substream))
1780                 return -ENXIO;
1781         runtime = substream->runtime;
1782         if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1783                 return -EINVAL;
1784         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1785                 return -EBADFD;
1786         return 0;
1787 }
1788
1789 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1790 {
1791         struct snd_pcm_runtime *runtime;
1792         int nonblock;
1793         int err;
1794
1795         err = pcm_sanity_check(substream);
1796         if (err < 0)
1797                 return err;
1798         runtime = substream->runtime;
1799         nonblock = !!(substream->f_flags & O_NONBLOCK);
1800
1801         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1802             runtime->channels > 1)
1803                 return -EINVAL;
1804         return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1805                                   snd_pcm_lib_write_transfer);
1806 }
1807
1808 EXPORT_SYMBOL(snd_pcm_lib_write);
1809
1810 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1811                                        unsigned int hwoff,
1812                                        unsigned long data, unsigned int off,
1813                                        snd_pcm_uframes_t frames)
1814 {
1815         struct snd_pcm_runtime *runtime = substream->runtime;
1816         int err;
1817         void __user **bufs = (void __user **)data;
1818         int channels = runtime->channels;
1819         int c;
1820         if (substream->ops->copy) {
1821                 if (snd_BUG_ON(!substream->ops->silence))
1822                         return -EINVAL;
1823                 for (c = 0; c < channels; ++c, ++bufs) {
1824                         if (*bufs == NULL) {
1825                                 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1826                                         return err;
1827                         } else {
1828                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1829                                 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1830                                         return err;
1831                         }
1832                 }
1833         } else {
1834                 /* default transfer behaviour */
1835                 size_t dma_csize = runtime->dma_bytes / channels;
1836                 for (c = 0; c < channels; ++c, ++bufs) {
1837                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1838                         if (*bufs == NULL) {
1839                                 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1840                         } else {
1841                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1842                                 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1843                                         return -EFAULT;
1844                         }
1845                 }
1846         }
1847         return 0;
1848 }
1849
1850 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1851                                      void __user **bufs,
1852                                      snd_pcm_uframes_t frames)
1853 {
1854         struct snd_pcm_runtime *runtime;
1855         int nonblock;
1856         int err;
1857
1858         err = pcm_sanity_check(substream);
1859         if (err < 0)
1860                 return err;
1861         runtime = substream->runtime;
1862         nonblock = !!(substream->f_flags & O_NONBLOCK);
1863
1864         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1865                 return -EINVAL;
1866         return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1867                                   nonblock, snd_pcm_lib_writev_transfer);
1868 }
1869
1870 EXPORT_SYMBOL(snd_pcm_lib_writev);
1871
1872 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
1873                                      unsigned int hwoff,
1874                                      unsigned long data, unsigned int off,
1875                                      snd_pcm_uframes_t frames)
1876 {
1877         struct snd_pcm_runtime *runtime = substream->runtime;
1878         int err;
1879         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1880         if (substream->ops->copy) {
1881                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1882                         return err;
1883         } else {
1884                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1885                 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
1886                         return -EFAULT;
1887         }
1888         return 0;
1889 }
1890
1891 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
1892                                            unsigned long data,
1893                                            snd_pcm_uframes_t size,
1894                                            int nonblock,
1895                                            transfer_f transfer)
1896 {
1897         struct snd_pcm_runtime *runtime = substream->runtime;
1898         snd_pcm_uframes_t xfer = 0;
1899         snd_pcm_uframes_t offset = 0;
1900         int err = 0;
1901
1902         if (size == 0)
1903                 return 0;
1904
1905         snd_pcm_stream_lock_irq(substream);
1906         switch (runtime->status->state) {
1907         case SNDRV_PCM_STATE_PREPARED:
1908                 if (size >= runtime->start_threshold) {
1909                         err = snd_pcm_start(substream);
1910                         if (err < 0)
1911                                 goto _end_unlock;
1912                 }
1913                 break;
1914         case SNDRV_PCM_STATE_DRAINING:
1915         case SNDRV_PCM_STATE_RUNNING:
1916         case SNDRV_PCM_STATE_PAUSED:
1917                 break;
1918         case SNDRV_PCM_STATE_XRUN:
1919                 err = -EPIPE;
1920                 goto _end_unlock;
1921         case SNDRV_PCM_STATE_SUSPENDED:
1922                 err = -ESTRPIPE;
1923                 goto _end_unlock;
1924         default:
1925                 err = -EBADFD;
1926                 goto _end_unlock;
1927         }
1928
1929         while (size > 0) {
1930                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1931                 snd_pcm_uframes_t avail;
1932                 snd_pcm_uframes_t cont;
1933                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1934                         snd_pcm_update_hw_ptr(substream);
1935                 avail = snd_pcm_capture_avail(runtime);
1936                 if (!avail) {
1937                         if (runtime->status->state ==
1938                             SNDRV_PCM_STATE_DRAINING) {
1939                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1940                                 goto _end_unlock;
1941                         }
1942                         if (nonblock) {
1943                                 err = -EAGAIN;
1944                                 goto _end_unlock;
1945                         }
1946                         err = wait_for_avail_min(substream, &avail);
1947                         if (err < 0)
1948                                 goto _end_unlock;
1949                         if (!avail)
1950                                 continue; /* draining */
1951                 }
1952                 frames = size > avail ? avail : size;
1953                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1954                 if (frames > cont)
1955                         frames = cont;
1956                 if (snd_BUG_ON(!frames)) {
1957                         snd_pcm_stream_unlock_irq(substream);
1958                         return -EINVAL;
1959                 }
1960                 appl_ptr = runtime->control->appl_ptr;
1961                 appl_ofs = appl_ptr % runtime->buffer_size;
1962                 snd_pcm_stream_unlock_irq(substream);
1963                 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
1964                         goto _end;
1965                 snd_pcm_stream_lock_irq(substream);
1966                 switch (runtime->status->state) {
1967                 case SNDRV_PCM_STATE_XRUN:
1968                         err = -EPIPE;
1969                         goto _end_unlock;
1970                 case SNDRV_PCM_STATE_SUSPENDED:
1971                         err = -ESTRPIPE;
1972                         goto _end_unlock;
1973                 default:
1974                         break;
1975                 }
1976                 appl_ptr += frames;
1977                 if (appl_ptr >= runtime->boundary)
1978                         appl_ptr -= runtime->boundary;
1979                 runtime->control->appl_ptr = appl_ptr;
1980                 if (substream->ops->ack)
1981                         substream->ops->ack(substream);
1982
1983                 offset += frames;
1984                 size -= frames;
1985                 xfer += frames;
1986         }
1987  _end_unlock:
1988         snd_pcm_stream_unlock_irq(substream);
1989  _end:
1990         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1991 }
1992
1993 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
1994 {
1995         struct snd_pcm_runtime *runtime;
1996         int nonblock;
1997         int err;
1998
1999         err = pcm_sanity_check(substream);
2000         if (err < 0)
2001                 return err;
2002         runtime = substream->runtime;
2003         nonblock = !!(substream->f_flags & O_NONBLOCK);
2004         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2005                 return -EINVAL;
2006         return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2007 }
2008
2009 EXPORT_SYMBOL(snd_pcm_lib_read);
2010
2011 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2012                                       unsigned int hwoff,
2013                                       unsigned long data, unsigned int off,
2014                                       snd_pcm_uframes_t frames)
2015 {
2016         struct snd_pcm_runtime *runtime = substream->runtime;
2017         int err;
2018         void __user **bufs = (void __user **)data;
2019         int channels = runtime->channels;
2020         int c;
2021         if (substream->ops->copy) {
2022                 for (c = 0; c < channels; ++c, ++bufs) {
2023                         char __user *buf;
2024                         if (*bufs == NULL)
2025                                 continue;
2026                         buf = *bufs + samples_to_bytes(runtime, off);
2027                         if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2028                                 return err;
2029                 }
2030         } else {
2031                 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2032                 for (c = 0; c < channels; ++c, ++bufs) {
2033                         char *hwbuf;
2034                         char __user *buf;
2035                         if (*bufs == NULL)
2036                                 continue;
2037
2038                         hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2039                         buf = *bufs + samples_to_bytes(runtime, off);
2040                         if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2041                                 return -EFAULT;
2042                 }
2043         }
2044         return 0;
2045 }
2046
2047 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2048                                     void __user **bufs,
2049                                     snd_pcm_uframes_t frames)
2050 {
2051         struct snd_pcm_runtime *runtime;
2052         int nonblock;
2053         int err;
2054
2055         err = pcm_sanity_check(substream);
2056         if (err < 0)
2057                 return err;
2058         runtime = substream->runtime;
2059         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2060                 return -EBADFD;
2061
2062         nonblock = !!(substream->f_flags & O_NONBLOCK);
2063         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2064                 return -EINVAL;
2065         return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2066 }
2067
2068 EXPORT_SYMBOL(snd_pcm_lib_readv);