git.oblomov.eu Git - linux-2.6/blob - 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 <sound/driver.h>
  24 #include <linux/slab.h>
  25 #include <linux/time.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  */
  42 void 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                         runtime->silence_filled = avail > 0 ? avail : 0;
  71                         runtime->silence_start = (runtime->status->hw_ptr +
  72                                                   runtime->silence_filled) %
  73                                                  runtime->boundary;
  74                 } else {
  75                         ofs = runtime->status->hw_ptr;
  76                         frames = new_hw_ptr - ofs;
  77                         if ((snd_pcm_sframes_t)frames < 0)
  78                                 frames += runtime->boundary;
  79                         runtime->silence_filled -= frames;
  80                         if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
  81                                 runtime->silence_filled = 0;
  82                                 runtime->silence_start = new_hw_ptr;
  83                         } else {
  84                                 runtime->silence_start = ofs;
  85                         }
  86                 }
  87                 frames = runtime->buffer_size - runtime->silence_filled;
  88         }
  89         snd_assert(frames <= runtime->buffer_size, 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_assert(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_assert(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 static void xrun(struct snd_pcm_substream *substream)
 129 {
 130         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 131 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 132         if (substream->pstr->xrun_debug) {
 133                 snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n",
 134                            substream->pcm->card->number,
 135                            substream->pcm->device,
 136                            substream->stream ? 'c' : 'p');
 137                 if (substream->pstr->xrun_debug > 1)
 138                         dump_stack();
 139         }
 140 #endif
 141 }
 142
 143 static inline snd_pcm_uframes_t snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
 144                                                           struct snd_pcm_runtime *runtime)
 145 {
 146         snd_pcm_uframes_t pos;
 147
 148         pos = substream->ops->pointer(substream);
 149         if (pos == SNDRV_PCM_POS_XRUN)
 150                 return pos; /* XRUN */
 151 #ifdef CONFIG_SND_DEBUG
 152         if (pos >= runtime->buffer_size) {
 153                 snd_printk(KERN_ERR  "BUG: stream = %i, pos = 0x%lx, buffer size = 0x%lx, period size = 0x%lx\n", substream->stream, pos, runtime->buffer_size, runtime->period_size);
 154         }
 155 #endif
 156         pos -= pos % runtime->min_align;
 157         return pos;
 158 }
 159
 160 static inline int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
 161                                              struct snd_pcm_runtime *runtime)
 162 {
 163         snd_pcm_uframes_t avail;
 164
 165         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 166                 avail = snd_pcm_playback_avail(runtime);
 167         else
 168                 avail = snd_pcm_capture_avail(runtime);
 169         if (avail > runtime->avail_max)
 170                 runtime->avail_max = avail;
 171         if (avail >= runtime->stop_threshold) {
 172                 if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
 173                         snd_pcm_drain_done(substream);
 174                 else
 175                         xrun(substream);
 176                 return -EPIPE;
 177         }
 178         if (avail >= runtime->control->avail_min)
 179                 wake_up(&runtime->sleep);
 180         return 0;
 181 }
 182
 183 static inline int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 184 {
 185         struct snd_pcm_runtime *runtime = substream->runtime;
 186         snd_pcm_uframes_t pos;
 187         snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt;
 188         snd_pcm_sframes_t delta;
 189
 190         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_MMAP)
 191                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 192         pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 193         if (pos == SNDRV_PCM_POS_XRUN) {
 194                 xrun(substream);
 195                 return -EPIPE;
 196         }
 197         if (runtime->period_size == runtime->buffer_size)
 198                 goto __next_buf;
 199         new_hw_ptr = runtime->hw_ptr_base + pos;
 200         hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
 201
 202         delta = hw_ptr_interrupt - new_hw_ptr;
 203         if (delta > 0) {
 204                 if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
 205 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 206                         if (runtime->periods > 1 && substream->pstr->xrun_debug) {
 207                                 snd_printd(KERN_ERR "Unexpected hw_pointer value [1] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2);
 208                                 if (substream->pstr->xrun_debug > 1)
 209                                         dump_stack();
 210                         }
 211 #endif
 212                         return 0;
 213                 }
 214               __next_buf:
 215                 runtime->hw_ptr_base += runtime->buffer_size;
 216                 if (runtime->hw_ptr_base == runtime->boundary)
 217                         runtime->hw_ptr_base = 0;
 218                 new_hw_ptr = runtime->hw_ptr_base + pos;
 219         }
 220
 221         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 222             runtime->silence_size > 0)
 223                 snd_pcm_playback_silence(substream, new_hw_ptr);
 224
 225         runtime->status->hw_ptr = new_hw_ptr;
 226         runtime->hw_ptr_interrupt = new_hw_ptr - new_hw_ptr % runtime->period_size;
 227
 228         return snd_pcm_update_hw_ptr_post(substream, runtime);
 229 }
 230
 231 /* CAUTION: call it with irq disabled */
 232 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 233 {
 234         struct snd_pcm_runtime *runtime = substream->runtime;
 235         snd_pcm_uframes_t pos;
 236         snd_pcm_uframes_t old_hw_ptr, new_hw_ptr;
 237         snd_pcm_sframes_t delta;
 238
 239         old_hw_ptr = runtime->status->hw_ptr;
 240         pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 241         if (pos == SNDRV_PCM_POS_XRUN) {
 242                 xrun(substream);
 243                 return -EPIPE;
 244         }
 245         new_hw_ptr = runtime->hw_ptr_base + pos;
 246
 247         delta = old_hw_ptr - new_hw_ptr;
 248         if (delta > 0) {
 249                 if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
 250 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 251                         if (runtime->periods > 2 && substream->pstr->xrun_debug) {
 252                                 snd_printd(KERN_ERR "Unexpected hw_pointer value [2] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2);
 253                                 if (substream->pstr->xrun_debug > 1)
 254                                         dump_stack();
 255                         }
 256 #endif
 257                         return 0;
 258                 }
 259                 runtime->hw_ptr_base += runtime->buffer_size;
 260                 if (runtime->hw_ptr_base == runtime->boundary)
 261                         runtime->hw_ptr_base = 0;
 262                 new_hw_ptr = runtime->hw_ptr_base + pos;
 263         }
 264         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 265             runtime->silence_size > 0)
 266                 snd_pcm_playback_silence(substream, new_hw_ptr);
 267
 268         runtime->status->hw_ptr = new_hw_ptr;
 269
 270         return snd_pcm_update_hw_ptr_post(substream, runtime);
 271 }
 272
 273 /**
 274  * snd_pcm_set_ops - set the PCM operators
 275  * @pcm: the pcm instance
 276  * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 277  * @ops: the operator table
 278  *
 279  * Sets the given PCM operators to the pcm instance.
 280  */
 281 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
 282 {
 283         struct snd_pcm_str *stream = &pcm->streams[direction];
 284         struct snd_pcm_substream *substream;
 285
 286         for (substream = stream->substream; substream != NULL; substream = substream->next)
 287                 substream->ops = ops;
 288 }
 289
 290 EXPORT_SYMBOL(snd_pcm_set_ops);
 291
 292 /**
 293  * snd_pcm_sync - set the PCM sync id
 294  * @substream: the pcm substream
 295  *
 296  * Sets the PCM sync identifier for the card.
 297  */
 298 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
 299 {
 300         struct snd_pcm_runtime *runtime = substream->runtime;
 301
 302         runtime->sync.id32[0] = substream->pcm->card->number;
 303         runtime->sync.id32[1] = -1;
 304         runtime->sync.id32[2] = -1;
 305         runtime->sync.id32[3] = -1;
 306 }
 307
 308 EXPORT_SYMBOL(snd_pcm_set_sync);
 309
 310 /*
 311  *  Standard ioctl routine
 312  */
 313
 314 static inline unsigned int div32(unsigned int a, unsigned int b,
 315                                  unsigned int *r)
 316 {
 317         if (b == 0) {
 318                 *r = 0;
 319                 return UINT_MAX;
 320         }
 321         *r = a % b;
 322         return a / b;
 323 }
 324
 325 static inline unsigned int div_down(unsigned int a, unsigned int b)
 326 {
 327         if (b == 0)
 328                 return UINT_MAX;
 329         return a / b;
 330 }
 331
 332 static inline unsigned int div_up(unsigned int a, unsigned int b)
 333 {
 334         unsigned int r;
 335         unsigned int q;
 336         if (b == 0)
 337                 return UINT_MAX;
 338         q = div32(a, b, &r);
 339         if (r)
 340                 ++q;
 341         return q;
 342 }
 343
 344 static inline unsigned int mul(unsigned int a, unsigned int b)
 345 {
 346         if (a == 0)
 347                 return 0;
 348         if (div_down(UINT_MAX, a) < b)
 349                 return UINT_MAX;
 350         return a * b;
 351 }
 352
 353 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
 354                                     unsigned int c, unsigned int *r)
 355 {
 356         u_int64_t n = (u_int64_t) a * b;
 357         if (c == 0) {
 358                 snd_assert(n > 0, );
 359                 *r = 0;
 360                 return UINT_MAX;
 361         }
 362         div64_32(&n, c, r);
 363         if (n >= UINT_MAX) {
 364                 *r = 0;
 365                 return UINT_MAX;
 366         }
 367         return n;
 368 }
 369
 370 /**
 371  * snd_interval_refine - refine the interval value of configurator
 372  * @i: the interval value to refine
 373  * @v: the interval value to refer to
 374  *
 375  * Refines the interval value with the reference value.
 376  * The interval is changed to the range satisfying both intervals.
 377  * The interval status (min, max, integer, etc.) are evaluated.
 378  *
 379  * Returns non-zero if the value is changed, zero if not changed.
 380  */
 381 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
 382 {
 383         int changed = 0;
 384         snd_assert(!snd_interval_empty(i), return -EINVAL);
 385         if (i->min < v->min) {
 386                 i->min = v->min;
 387                 i->openmin = v->openmin;
 388                 changed = 1;
 389         } else if (i->min == v->min && !i->openmin && v->openmin) {
 390                 i->openmin = 1;
 391                 changed = 1;
 392         }
 393         if (i->max > v->max) {
 394                 i->max = v->max;
 395                 i->openmax = v->openmax;
 396                 changed = 1;
 397         } else if (i->max == v->max && !i->openmax && v->openmax) {
 398                 i->openmax = 1;
 399                 changed = 1;
 400         }
 401         if (!i->integer && v->integer) {
 402                 i->integer = 1;
 403                 changed = 1;
 404         }
 405         if (i->integer) {
 406                 if (i->openmin) {
 407                         i->min++;
 408                         i->openmin = 0;
 409                 }
 410                 if (i->openmax) {
 411                         i->max--;
 412                         i->openmax = 0;
 413                 }
 414         } else if (!i->openmin && !i->openmax && i->min == i->max)
 415                 i->integer = 1;
 416         if (snd_interval_checkempty(i)) {
 417                 snd_interval_none(i);
 418                 return -EINVAL;
 419         }
 420         return changed;
 421 }
 422
 423 EXPORT_SYMBOL(snd_interval_refine);
 424
 425 static int snd_interval_refine_first(struct snd_interval *i)
 426 {
 427         snd_assert(!snd_interval_empty(i), return -EINVAL);
 428         if (snd_interval_single(i))
 429                 return 0;
 430         i->max = i->min;
 431         i->openmax = i->openmin;
 432         if (i->openmax)
 433                 i->max++;
 434         return 1;
 435 }
 436
 437 static int snd_interval_refine_last(struct snd_interval *i)
 438 {
 439         snd_assert(!snd_interval_empty(i), return -EINVAL);
 440         if (snd_interval_single(i))
 441                 return 0;
 442         i->min = i->max;
 443         i->openmin = i->openmax;
 444         if (i->openmin)
 445                 i->min--;
 446         return 1;
 447 }
 448
 449 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 450 {
 451         if (a->empty || b->empty) {
 452                 snd_interval_none(c);
 453                 return;
 454         }
 455         c->empty = 0;
 456         c->min = mul(a->min, b->min);
 457         c->openmin = (a->openmin || b->openmin);
 458         c->max = mul(a->max,  b->max);
 459         c->openmax = (a->openmax || b->openmax);
 460         c->integer = (a->integer && b->integer);
 461 }
 462
 463 /**
 464  * snd_interval_div - refine the interval value with division
 465  * @a: dividend
 466  * @b: divisor
 467  * @c: quotient
 468  *
 469  * c = a / b
 470  *
 471  * Returns non-zero if the value is changed, zero if not changed.
 472  */
 473 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 474 {
 475         unsigned int r;
 476         if (a->empty || b->empty) {
 477                 snd_interval_none(c);
 478                 return;
 479         }
 480         c->empty = 0;
 481         c->min = div32(a->min, b->max, &r);
 482         c->openmin = (r || a->openmin || b->openmax);
 483         if (b->min > 0) {
 484                 c->max = div32(a->max, b->min, &r);
 485                 if (r) {
 486                         c->max++;
 487                         c->openmax = 1;
 488                 } else
 489                         c->openmax = (a->openmax || b->openmin);
 490         } else {
 491                 c->max = UINT_MAX;
 492                 c->openmax = 0;
 493         }
 494         c->integer = 0;
 495 }
 496
 497 /**
 498  * snd_interval_muldivk - refine the interval value
 499  * @a: dividend 1
 500  * @b: dividend 2
 501  * @k: divisor (as integer)
 502  * @c: result
 503   *
 504  * c = a * b / k
 505  *
 506  * Returns non-zero if the value is changed, zero if not changed.
 507  */
 508 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 509                       unsigned int k, struct snd_interval *c)
 510 {
 511         unsigned int r;
 512         if (a->empty || b->empty) {
 513                 snd_interval_none(c);
 514                 return;
 515         }
 516         c->empty = 0;
 517         c->min = muldiv32(a->min, b->min, k, &r);
 518         c->openmin = (r || a->openmin || b->openmin);
 519         c->max = muldiv32(a->max, b->max, k, &r);
 520         if (r) {
 521                 c->max++;
 522                 c->openmax = 1;
 523         } else
 524                 c->openmax = (a->openmax || b->openmax);
 525         c->integer = 0;
 526 }
 527
 528 /**
 529  * snd_interval_mulkdiv - refine the interval value
 530  * @a: dividend 1
 531  * @k: dividend 2 (as integer)
 532  * @b: divisor
 533  * @c: result
 534  *
 535  * c = a * k / b
 536  *
 537  * Returns non-zero if the value is changed, zero if not changed.
 538  */
 539 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 540                       const struct snd_interval *b, struct snd_interval *c)
 541 {
 542         unsigned int r;
 543         if (a->empty || b->empty) {
 544                 snd_interval_none(c);
 545                 return;
 546         }
 547         c->empty = 0;
 548         c->min = muldiv32(a->min, k, b->max, &r);
 549         c->openmin = (r || a->openmin || b->openmax);
 550         if (b->min > 0) {
 551                 c->max = muldiv32(a->max, k, b->min, &r);
 552                 if (r) {
 553                         c->max++;
 554                         c->openmax = 1;
 555                 } else
 556                         c->openmax = (a->openmax || b->openmin);
 557         } else {
 558                 c->max = UINT_MAX;
 559                 c->openmax = 0;
 560         }
 561         c->integer = 0;
 562 }
 563
 564 /* ---- */
 565
 566
 567 /**
 568  * snd_interval_ratnum - refine the interval value
 569  * @i: interval to refine
 570  * @rats_count: number of ratnum_t
 571  * @rats: ratnum_t array
 572  * @nump: pointer to store the resultant numerator
 573  * @denp: pointer to store the resultant denominator
 574  *
 575  * Returns non-zero if the value is changed, zero if not changed.
 576  */
 577 int snd_interval_ratnum(struct snd_interval *i,
 578                         unsigned int rats_count, struct snd_ratnum *rats,
 579                         unsigned int *nump, unsigned int *denp)
 580 {
 581         unsigned int best_num, best_diff, best_den;
 582         unsigned int k;
 583         struct snd_interval t;
 584         int err;
 585
 586         best_num = best_den = best_diff = 0;
 587         for (k = 0; k < rats_count; ++k) {
 588                 unsigned int num = rats[k].num;
 589                 unsigned int den;
 590                 unsigned int q = i->min;
 591                 int diff;
 592                 if (q == 0)
 593                         q = 1;
 594                 den = div_down(num, q);
 595                 if (den < rats[k].den_min)
 596                         continue;
 597                 if (den > rats[k].den_max)
 598                         den = rats[k].den_max;
 599                 else {
 600                         unsigned int r;
 601                         r = (den - rats[k].den_min) % rats[k].den_step;
 602                         if (r != 0)
 603                                 den -= r;
 604                 }
 605                 diff = num - q * den;
 606                 if (best_num == 0 ||
 607                     diff * best_den < best_diff * den) {
 608                         best_diff = diff;
 609                         best_den = den;
 610                         best_num = num;
 611                 }
 612         }
 613         if (best_den == 0) {
 614                 i->empty = 1;
 615                 return -EINVAL;
 616         }
 617         t.min = div_down(best_num, best_den);
 618         t.openmin = !!(best_num % best_den);
 619
 620         best_num = best_den = best_diff = 0;
 621         for (k = 0; k < rats_count; ++k) {
 622                 unsigned int num = rats[k].num;
 623                 unsigned int den;
 624                 unsigned int q = i->max;
 625                 int diff;
 626                 if (q == 0) {
 627                         i->empty = 1;
 628                         return -EINVAL;
 629                 }
 630                 den = div_up(num, q);
 631                 if (den > rats[k].den_max)
 632                         continue;
 633                 if (den < rats[k].den_min)
 634                         den = rats[k].den_min;
 635                 else {
 636                         unsigned int r;
 637                         r = (den - rats[k].den_min) % rats[k].den_step;
 638                         if (r != 0)
 639                                 den += rats[k].den_step - r;
 640                 }
 641                 diff = q * den - num;
 642                 if (best_num == 0 ||
 643                     diff * best_den < best_diff * den) {
 644                         best_diff = diff;
 645                         best_den = den;
 646                         best_num = num;
 647                 }
 648         }
 649         if (best_den == 0) {
 650                 i->empty = 1;
 651                 return -EINVAL;
 652         }
 653         t.max = div_up(best_num, best_den);
 654         t.openmax = !!(best_num % best_den);
 655         t.integer = 0;
 656         err = snd_interval_refine(i, &t);
 657         if (err < 0)
 658                 return err;
 659
 660         if (snd_interval_single(i)) {
 661                 if (nump)
 662                         *nump = best_num;
 663                 if (denp)
 664                         *denp = best_den;
 665         }
 666         return err;
 667 }
 668
 669 EXPORT_SYMBOL(snd_interval_ratnum);
 670
 671 /**
 672  * snd_interval_ratden - refine the interval value
 673  * @i: interval to refine
 674  * @rats_count: number of struct ratden
 675  * @rats: struct ratden array
 676  * @nump: pointer to store the resultant numerator
 677  * @denp: pointer to store the resultant denominator
 678  *
 679  * Returns non-zero if the value is changed, zero if not changed.
 680  */
 681 static int snd_interval_ratden(struct snd_interval *i,
 682                                unsigned int rats_count, struct snd_ratden *rats,
 683                                unsigned int *nump, unsigned int *denp)
 684 {
 685         unsigned int best_num, best_diff, best_den;
 686         unsigned int k;
 687         struct snd_interval t;
 688         int err;
 689
 690         best_num = best_den = best_diff = 0;
 691         for (k = 0; k < rats_count; ++k) {
 692                 unsigned int num;
 693                 unsigned int den = rats[k].den;
 694                 unsigned int q = i->min;
 695                 int diff;
 696                 num = mul(q, den);
 697                 if (num > rats[k].num_max)
 698                         continue;
 699                 if (num < rats[k].num_min)
 700                         num = rats[k].num_max;
 701                 else {
 702                         unsigned int r;
 703                         r = (num - rats[k].num_min) % rats[k].num_step;
 704                         if (r != 0)
 705                                 num += rats[k].num_step - r;
 706                 }
 707                 diff = num - q * den;
 708                 if (best_num == 0 ||
 709                     diff * best_den < best_diff * den) {
 710                         best_diff = diff;
 711                         best_den = den;
 712                         best_num = num;
 713                 }
 714         }
 715         if (best_den == 0) {
 716                 i->empty = 1;
 717                 return -EINVAL;
 718         }
 719         t.min = div_down(best_num, best_den);
 720         t.openmin = !!(best_num % best_den);
 721
 722         best_num = best_den = best_diff = 0;
 723         for (k = 0; k < rats_count; ++k) {
 724                 unsigned int num;
 725                 unsigned int den = rats[k].den;
 726                 unsigned int q = i->max;
 727                 int diff;
 728                 num = mul(q, den);
 729                 if (num < rats[k].num_min)
 730                         continue;
 731                 if (num > rats[k].num_max)
 732                         num = rats[k].num_max;
 733                 else {
 734                         unsigned int r;
 735                         r = (num - rats[k].num_min) % rats[k].num_step;
 736                         if (r != 0)
 737                                 num -= r;
 738                 }
 739                 diff = q * den - num;
 740                 if (best_num == 0 ||
 741                     diff * best_den < best_diff * den) {
 742                         best_diff = diff;
 743                         best_den = den;
 744                         best_num = num;
 745                 }
 746         }
 747         if (best_den == 0) {
 748                 i->empty = 1;
 749                 return -EINVAL;
 750         }
 751         t.max = div_up(best_num, best_den);
 752         t.openmax = !!(best_num % best_den);
 753         t.integer = 0;
 754         err = snd_interval_refine(i, &t);
 755         if (err < 0)
 756                 return err;
 757
 758         if (snd_interval_single(i)) {
 759                 if (nump)
 760                         *nump = best_num;
 761                 if (denp)
 762                         *denp = best_den;
 763         }
 764         return err;
 765 }
 766
 767 /**
 768  * snd_interval_list - refine the interval value from the list
 769  * @i: the interval value to refine
 770  * @count: the number of elements in the list
 771  * @list: the value list
 772  * @mask: the bit-mask to evaluate
 773  *
 774  * Refines the interval value from the list.
 775  * When mask is non-zero, only the elements corresponding to bit 1 are
 776  * evaluated.
 777  *
 778  * Returns non-zero if the value is changed, zero if not changed.
 779  */
 780 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
 781 {
 782         unsigned int k;
 783         int changed = 0;
 784
 785         if (!count) {
 786                 i->empty = 1;
 787                 return -EINVAL;
 788         }
 789         for (k = 0; k < count; k++) {
 790                 if (mask && !(mask & (1 << k)))
 791                         continue;
 792                 if (i->min == list[k] && !i->openmin)
 793                         goto _l1;
 794                 if (i->min < list[k]) {
 795                         i->min = list[k];
 796                         i->openmin = 0;
 797                         changed = 1;
 798                         goto _l1;
 799                 }
 800         }
 801         i->empty = 1;
 802         return -EINVAL;
 803  _l1:
 804         for (k = count; k-- > 0;) {
 805                 if (mask && !(mask & (1 << k)))
 806                         continue;
 807                 if (i->max == list[k] && !i->openmax)
 808                         goto _l2;
 809                 if (i->max > list[k]) {
 810                         i->max = list[k];
 811                         i->openmax = 0;
 812                         changed = 1;
 813                         goto _l2;
 814                 }
 815         }
 816         i->empty = 1;
 817         return -EINVAL;
 818  _l2:
 819         if (snd_interval_checkempty(i)) {
 820                 i->empty = 1;
 821                 return -EINVAL;
 822         }
 823         return changed;
 824 }
 825
 826 EXPORT_SYMBOL(snd_interval_list);
 827
 828 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
 829 {
 830         unsigned int n;
 831         int changed = 0;
 832         n = (i->min - min) % step;
 833         if (n != 0 || i->openmin) {
 834                 i->min += step - n;
 835                 changed = 1;
 836         }
 837         n = (i->max - min) % step;
 838         if (n != 0 || i->openmax) {
 839                 i->max -= n;
 840                 changed = 1;
 841         }
 842         if (snd_interval_checkempty(i)) {
 843                 i->empty = 1;
 844                 return -EINVAL;
 845         }
 846         return changed;
 847 }
 848
 849 /* Info constraints helpers */
 850
 851 /**
 852  * snd_pcm_hw_rule_add - add the hw-constraint rule
 853  * @runtime: the pcm runtime instance
 854  * @cond: condition bits
 855  * @var: the variable to evaluate
 856  * @func: the evaluation function
 857  * @private: the private data pointer passed to function
 858  * @dep: the dependent variables
 859  *
 860  * Returns zero if successful, or a negative error code on failure.
 861  */
 862 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
 863                         int var,
 864                         snd_pcm_hw_rule_func_t func, void *private,
 865                         int dep, ...)
 866 {
 867         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
 868         struct snd_pcm_hw_rule *c;
 869         unsigned int k;
 870         va_list args;
 871         va_start(args, dep);
 872         if (constrs->rules_num >= constrs->rules_all) {
 873                 struct snd_pcm_hw_rule *new;
 874                 unsigned int new_rules = constrs->rules_all + 16;
 875                 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
 876                 if (!new)
 877                         return -ENOMEM;
 878                 if (constrs->rules) {
 879                         memcpy(new, constrs->rules,
 880                                constrs->rules_num * sizeof(*c));
 881                         kfree(constrs->rules);
 882                 }
 883                 constrs->rules = new;
 884                 constrs->rules_all = new_rules;
 885         }
 886         c = &constrs->rules[constrs->rules_num];
 887         c->cond = cond;
 888         c->func = func;
 889         c->var = var;
 890         c->private = private;
 891         k = 0;
 892         while (1) {
 893                 snd_assert(k < ARRAY_SIZE(c->deps), return -EINVAL);
 894                 c->deps[k++] = dep;
 895                 if (dep < 0)
 896                         break;
 897                 dep = va_arg(args, int);
 898         }
 899         constrs->rules_num++;
 900         va_end(args);
 901         return 0;
 902 }
 903
 904 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
 905
 906 /**
 907  * snd_pcm_hw_constraint_mask
 908  * @runtime: PCM runtime instance
 909  * @var: hw_params variable to apply the mask
 910  * @mask: the bitmap mask
 911  *
 912  * Apply the constraint of the given bitmap mask to a mask parameter.
 913  */
 914 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 915                                u_int32_t mask)
 916 {
 917         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
 918         struct snd_mask *maskp = constrs_mask(constrs, var);
 919         *maskp->bits &= mask;
 920         memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
 921         if (*maskp->bits == 0)
 922                 return -EINVAL;
 923         return 0;
 924 }
 925
 926 /**
 927  * snd_pcm_hw_constraint_mask64
 928  * @runtime: PCM runtime instance
 929  * @var: hw_params variable to apply the mask
 930  * @mask: the 64bit bitmap mask
 931  *
 932  * Apply the constraint of the given bitmap mask to a mask parameter.
 933  */
 934 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 935                                  u_int64_t mask)
 936 {
 937         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
 938         struct snd_mask *maskp = constrs_mask(constrs, var);
 939         maskp->bits[0] &= (u_int32_t)mask;
 940         maskp->bits[1] &= (u_int32_t)(mask >> 32);
 941         memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
 942         if (! maskp->bits[0] && ! maskp->bits[1])
 943                 return -EINVAL;
 944         return 0;
 945 }
 946
 947 /**
 948  * snd_pcm_hw_constraint_integer
 949  * @runtime: PCM runtime instance
 950  * @var: hw_params variable to apply the integer constraint
 951  *
 952  * Apply the constraint of integer to an interval parameter.
 953  */
 954 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
 955 {
 956         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
 957         return snd_interval_setinteger(constrs_interval(constrs, var));
 958 }
 959
 960 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
 961
 962 /**
 963  * snd_pcm_hw_constraint_minmax
 964  * @runtime: PCM runtime instance
 965  * @var: hw_params variable to apply the range
 966  * @min: the minimal value
 967  * @max: the maximal value
 968  *
 969  * Apply the min/max range constraint to an interval parameter.
 970  */
 971 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
 972                                  unsigned int min, unsigned int max)
 973 {
 974         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
 975         struct snd_interval t;
 976         t.min = min;
 977         t.max = max;
 978         t.openmin = t.openmax = 0;
 979         t.integer = 0;
 980         return snd_interval_refine(constrs_interval(constrs, var), &t);
 981 }
 982
 983 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
 984
 985 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
 986                                 struct snd_pcm_hw_rule *rule)
 987 {
 988         struct snd_pcm_hw_constraint_list *list = rule->private;
 989         return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
 990 }
 991
 992
 993 /**
 994  * snd_pcm_hw_constraint_list
 995  * @runtime: PCM runtime instance
 996  * @cond: condition bits
 997  * @var: hw_params variable to apply the list constraint
 998  * @l: list
 999  *
1000  * Apply the list of constraints to an interval parameter.
1001  */
1002 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1003                                unsigned int cond,
1004                                snd_pcm_hw_param_t var,
1005                                struct snd_pcm_hw_constraint_list *l)
1006 {
1007         return snd_pcm_hw_rule_add(runtime, cond, var,
1008                                    snd_pcm_hw_rule_list, l,
1009                                    var, -1);
1010 }
1011
1012 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1013
1014 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1015                                    struct snd_pcm_hw_rule *rule)
1016 {
1017         struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1018         unsigned int num = 0, den = 0;
1019         int err;
1020         err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1021                                   r->nrats, r->rats, &num, &den);
1022         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1023                 params->rate_num = num;
1024                 params->rate_den = den;
1025         }
1026         return err;
1027 }
1028
1029 /**
1030  * snd_pcm_hw_constraint_ratnums
1031  * @runtime: PCM runtime instance
1032  * @cond: condition bits
1033  * @var: hw_params variable to apply the ratnums constraint
1034  * @r: struct snd_ratnums constriants
1035  */
1036 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1037                                   unsigned int cond,
1038                                   snd_pcm_hw_param_t var,
1039                                   struct snd_pcm_hw_constraint_ratnums *r)
1040 {
1041         return snd_pcm_hw_rule_add(runtime, cond, var,
1042                                    snd_pcm_hw_rule_ratnums, r,
1043                                    var, -1);
1044 }
1045
1046 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1047
1048 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1049                                    struct snd_pcm_hw_rule *rule)
1050 {
1051         struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1052         unsigned int num = 0, den = 0;
1053         int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1054                                   r->nrats, r->rats, &num, &den);
1055         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1056                 params->rate_num = num;
1057                 params->rate_den = den;
1058         }
1059         return err;
1060 }
1061
1062 /**
1063  * snd_pcm_hw_constraint_ratdens
1064  * @runtime: PCM runtime instance
1065  * @cond: condition bits
1066  * @var: hw_params variable to apply the ratdens constraint
1067  * @r: struct snd_ratdens constriants
1068  */
1069 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1070                                   unsigned int cond,
1071                                   snd_pcm_hw_param_t var,
1072                                   struct snd_pcm_hw_constraint_ratdens *r)
1073 {
1074         return snd_pcm_hw_rule_add(runtime, cond, var,
1075                                    snd_pcm_hw_rule_ratdens, r,
1076                                    var, -1);
1077 }
1078
1079 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1080
1081 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1082                                   struct snd_pcm_hw_rule *rule)
1083 {
1084         unsigned int l = (unsigned long) rule->private;
1085         int width = l & 0xffff;
1086         unsigned int msbits = l >> 16;
1087         struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1088         if (snd_interval_single(i) && snd_interval_value(i) == width)
1089                 params->msbits = msbits;
1090         return 0;
1091 }
1092
1093 /**
1094  * snd_pcm_hw_constraint_msbits
1095  * @runtime: PCM runtime instance
1096  * @cond: condition bits
1097  * @width: sample bits width
1098  * @msbits: msbits width
1099  */
1100 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1101                                  unsigned int cond,
1102                                  unsigned int width,
1103                                  unsigned int msbits)
1104 {
1105         unsigned long l = (msbits << 16) | width;
1106         return snd_pcm_hw_rule_add(runtime, cond, -1,
1107                                     snd_pcm_hw_rule_msbits,
1108                                     (void*) l,
1109                                     SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1110 }
1111
1112 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1113
1114 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1115                                 struct snd_pcm_hw_rule *rule)
1116 {
1117         unsigned long step = (unsigned long) rule->private;
1118         return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1119 }
1120
1121 /**
1122  * snd_pcm_hw_constraint_step
1123  * @runtime: PCM runtime instance
1124  * @cond: condition bits
1125  * @var: hw_params variable to apply the step constraint
1126  * @step: step size
1127  */
1128 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1129                                unsigned int cond,
1130                                snd_pcm_hw_param_t var,
1131                                unsigned long step)
1132 {
1133         return snd_pcm_hw_rule_add(runtime, cond, var,
1134                                    snd_pcm_hw_rule_step, (void *) step,
1135                                    var, -1);
1136 }
1137
1138 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1139
1140 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1141 {
1142         static int pow2_sizes[] = {
1143                 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1144                 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1145                 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1146                 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1147         };
1148         return snd_interval_list(hw_param_interval(params, rule->var),
1149                                  ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1150 }
1151
1152 /**
1153  * snd_pcm_hw_constraint_pow2
1154  * @runtime: PCM runtime instance
1155  * @cond: condition bits
1156  * @var: hw_params variable to apply the power-of-2 constraint
1157  */
1158 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1159                                unsigned int cond,
1160                                snd_pcm_hw_param_t var)
1161 {
1162         return snd_pcm_hw_rule_add(runtime, cond, var,
1163                                    snd_pcm_hw_rule_pow2, NULL,
1164                                    var, -1);
1165 }
1166
1167 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1168
1169 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1170                                   snd_pcm_hw_param_t var)
1171 {
1172         if (hw_is_mask(var)) {
1173                 snd_mask_any(hw_param_mask(params, var));
1174                 params->cmask |= 1 << var;
1175                 params->rmask |= 1 << var;
1176                 return;
1177         }
1178         if (hw_is_interval(var)) {
1179                 snd_interval_any(hw_param_interval(params, var));
1180                 params->cmask |= 1 << var;
1181                 params->rmask |= 1 << var;
1182                 return;
1183         }
1184         snd_BUG();
1185 }
1186
1187 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1188 {
1189         unsigned int k;
1190         memset(params, 0, sizeof(*params));
1191         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1192                 _snd_pcm_hw_param_any(params, k);
1193         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1194                 _snd_pcm_hw_param_any(params, k);
1195         params->info = ~0U;
1196 }
1197
1198 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1199
1200 /**
1201  * snd_pcm_hw_param_value
1202  * @params: the hw_params instance
1203  * @var: parameter to retrieve
1204  * @dir: pointer to the direction (-1,0,1) or NULL
1205  *
1206  * Return the value for field PAR if it's fixed in configuration space
1207  *  defined by PARAMS. Return -EINVAL otherwise
1208  */
1209 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1210                            snd_pcm_hw_param_t var, int *dir)
1211 {
1212         if (hw_is_mask(var)) {
1213                 const struct snd_mask *mask = hw_param_mask_c(params, var);
1214                 if (!snd_mask_single(mask))
1215                         return -EINVAL;
1216                 if (dir)
1217                         *dir = 0;
1218                 return snd_mask_value(mask);
1219         }
1220         if (hw_is_interval(var)) {
1221                 const struct snd_interval *i = hw_param_interval_c(params, var);
1222                 if (!snd_interval_single(i))
1223                         return -EINVAL;
1224                 if (dir)
1225                         *dir = i->openmin;
1226                 return snd_interval_value(i);
1227         }
1228         return -EINVAL;
1229 }
1230
1231 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1232
1233 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1234                                 snd_pcm_hw_param_t var)
1235 {
1236         if (hw_is_mask(var)) {
1237                 snd_mask_none(hw_param_mask(params, var));
1238                 params->cmask |= 1 << var;
1239                 params->rmask |= 1 << var;
1240         } else if (hw_is_interval(var)) {
1241                 snd_interval_none(hw_param_interval(params, var));
1242                 params->cmask |= 1 << var;
1243                 params->rmask |= 1 << var;
1244         } else {
1245                 snd_BUG();
1246         }
1247 }
1248
1249 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1250
1251 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1252                                    snd_pcm_hw_param_t var)
1253 {
1254         int changed;
1255         if (hw_is_mask(var))
1256                 changed = snd_mask_refine_first(hw_param_mask(params, var));
1257         else if (hw_is_interval(var))
1258                 changed = snd_interval_refine_first(hw_param_interval(params, var));
1259         else
1260                 return -EINVAL;
1261         if (changed) {
1262                 params->cmask |= 1 << var;
1263                 params->rmask |= 1 << var;
1264         }
1265         return changed;
1266 }
1267
1268
1269 /**
1270  * snd_pcm_hw_param_first
1271  * @pcm: PCM instance
1272  * @params: the hw_params instance
1273  * @var: parameter to retrieve
1274  * @dir: pointer to the direction (-1,0,1) or NULL
1275  *
1276  * Inside configuration space defined by PARAMS remove from PAR all
1277  * values > minimum. Reduce configuration space accordingly.
1278  * Return the minimum.
1279  */
1280 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1281                            struct snd_pcm_hw_params *params,
1282                            snd_pcm_hw_param_t var, int *dir)
1283 {
1284         int changed = _snd_pcm_hw_param_first(params, var);
1285         if (changed < 0)
1286                 return changed;
1287         if (params->rmask) {
1288                 int err = snd_pcm_hw_refine(pcm, params);
1289                 snd_assert(err >= 0, return err);
1290         }
1291         return snd_pcm_hw_param_value(params, var, dir);
1292 }
1293
1294 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1295
1296 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1297                                   snd_pcm_hw_param_t var)
1298 {
1299         int changed;
1300         if (hw_is_mask(var))
1301                 changed = snd_mask_refine_last(hw_param_mask(params, var));
1302         else if (hw_is_interval(var))
1303                 changed = snd_interval_refine_last(hw_param_interval(params, var));
1304         else
1305                 return -EINVAL;
1306         if (changed) {
1307                 params->cmask |= 1 << var;
1308                 params->rmask |= 1 << var;
1309         }
1310         return changed;
1311 }
1312
1313
1314 /**
1315  * snd_pcm_hw_param_last
1316  * @pcm: PCM instance
1317  * @params: the hw_params instance
1318  * @var: parameter to retrieve
1319  * @dir: pointer to the direction (-1,0,1) or NULL
1320  *
1321  * Inside configuration space defined by PARAMS remove from PAR all
1322  * values < maximum. Reduce configuration space accordingly.
1323  * Return the maximum.
1324  */
1325 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1326                           struct snd_pcm_hw_params *params,
1327                           snd_pcm_hw_param_t var, int *dir)
1328 {
1329         int changed = _snd_pcm_hw_param_last(params, var);
1330         if (changed < 0)
1331                 return changed;
1332         if (params->rmask) {
1333                 int err = snd_pcm_hw_refine(pcm, params);
1334                 snd_assert(err >= 0, return err);
1335         }
1336         return snd_pcm_hw_param_value(params, var, dir);
1337 }
1338
1339 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1340
1341 /**
1342  * snd_pcm_hw_param_choose
1343  * @pcm: PCM instance
1344  * @params: the hw_params instance
1345  *
1346  * Choose one configuration from configuration space defined by PARAMS
1347  * The configuration chosen is that obtained fixing in this order:
1348  * first access, first format, first subformat, min channels,
1349  * min rate, min period time, max buffer size, min tick time
1350  */
1351 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1352                              struct snd_pcm_hw_params *params)
1353 {
1354         static int vars[] = {
1355                 SNDRV_PCM_HW_PARAM_ACCESS,
1356                 SNDRV_PCM_HW_PARAM_FORMAT,
1357                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1358                 SNDRV_PCM_HW_PARAM_CHANNELS,
1359                 SNDRV_PCM_HW_PARAM_RATE,
1360                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1361                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1362                 SNDRV_PCM_HW_PARAM_TICK_TIME,
1363                 -1
1364         };
1365         int err, *v;
1366
1367         for (v = vars; *v != -1; v++) {
1368                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1369                         err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1370                 else
1371                         err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1372                 snd_assert(err >= 0, return err);
1373         }
1374         return 0;
1375 }
1376
1377 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1378                                    void *arg)
1379 {
1380         struct snd_pcm_runtime *runtime = substream->runtime;
1381         unsigned long flags;
1382         snd_pcm_stream_lock_irqsave(substream, flags);
1383         if (snd_pcm_running(substream) &&
1384             snd_pcm_update_hw_ptr(substream) >= 0)
1385                 runtime->status->hw_ptr %= runtime->buffer_size;
1386         else
1387                 runtime->status->hw_ptr = 0;
1388         snd_pcm_stream_unlock_irqrestore(substream, flags);
1389         return 0;
1390 }
1391
1392 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1393                                           void *arg)
1394 {
1395         struct snd_pcm_channel_info *info = arg;
1396         struct snd_pcm_runtime *runtime = substream->runtime;
1397         int width;
1398         if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1399                 info->offset = -1;
1400                 return 0;
1401         }
1402         width = snd_pcm_format_physical_width(runtime->format);
1403         if (width < 0)
1404                 return width;
1405         info->offset = 0;
1406         switch (runtime->access) {
1407         case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1408         case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1409                 info->first = info->channel * width;
1410                 info->step = runtime->channels * width;
1411                 break;
1412         case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1413         case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1414         {
1415                 size_t size = runtime->dma_bytes / runtime->channels;
1416                 info->first = info->channel * size * 8;
1417                 info->step = width;
1418                 break;
1419         }
1420         default:
1421                 snd_BUG();
1422                 break;
1423         }
1424         return 0;
1425 }
1426
1427 /**
1428  * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1429  * @substream: the pcm substream instance
1430  * @cmd: ioctl command
1431  * @arg: ioctl argument
1432  *
1433  * Processes the generic ioctl commands for PCM.
1434  * Can be passed as the ioctl callback for PCM ops.
1435  *
1436  * Returns zero if successful, or a negative error code on failure.
1437  */
1438 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1439                       unsigned int cmd, void *arg)
1440 {
1441         switch (cmd) {
1442         case SNDRV_PCM_IOCTL1_INFO:
1443                 return 0;
1444         case SNDRV_PCM_IOCTL1_RESET:
1445                 return snd_pcm_lib_ioctl_reset(substream, arg);
1446         case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1447                 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1448         }
1449         return -ENXIO;
1450 }
1451
1452 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1453
1454 /*
1455  *  Conditions
1456  */
1457
1458 static void snd_pcm_system_tick_set(struct snd_pcm_substream *substream,
1459                                     unsigned long ticks)
1460 {
1461         struct snd_pcm_runtime *runtime = substream->runtime;
1462         if (ticks == 0)
1463                 del_timer(&runtime->tick_timer);
1464         else {
1465                 ticks += (1000000 / HZ) - 1;
1466                 ticks /= (1000000 / HZ);
1467                 mod_timer(&runtime->tick_timer, jiffies + ticks);
1468         }
1469 }
1470
1471 /* Temporary alias */
1472 void snd_pcm_tick_set(struct snd_pcm_substream *substream, unsigned long ticks)
1473 {
1474         snd_pcm_system_tick_set(substream, ticks);
1475 }
1476
1477 void snd_pcm_tick_prepare(struct snd_pcm_substream *substream)
1478 {
1479         struct snd_pcm_runtime *runtime = substream->runtime;
1480         snd_pcm_uframes_t frames = ULONG_MAX;
1481         snd_pcm_uframes_t avail, dist;
1482         unsigned int ticks;
1483         u_int64_t n;
1484         u_int32_t r;
1485         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1486                 if (runtime->silence_size >= runtime->boundary) {
1487                         frames = 1;
1488                 } else if (runtime->silence_size > 0 &&
1489                            runtime->silence_filled < runtime->buffer_size) {
1490                         snd_pcm_sframes_t noise_dist;
1491                         noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
1492                         if (noise_dist > (snd_pcm_sframes_t)runtime->silence_threshold)
1493                                 frames = noise_dist - runtime->silence_threshold;
1494                 }
1495                 avail = snd_pcm_playback_avail(runtime);
1496         } else {
1497                 avail = snd_pcm_capture_avail(runtime);
1498         }
1499         if (avail < runtime->control->avail_min) {
1500                 snd_pcm_sframes_t n = runtime->control->avail_min - avail;
1501                 if (n > 0 && frames > (snd_pcm_uframes_t)n)
1502                         frames = n;
1503         }
1504         if (avail < runtime->buffer_size) {
1505                 snd_pcm_sframes_t n = runtime->buffer_size - avail;
1506                 if (n > 0 && frames > (snd_pcm_uframes_t)n)
1507                         frames = n;
1508         }
1509         if (frames == ULONG_MAX) {
1510                 snd_pcm_tick_set(substream, 0);
1511                 return;
1512         }
1513         dist = runtime->status->hw_ptr - runtime->hw_ptr_base;
1514         /* Distance to next interrupt */
1515         dist = runtime->period_size - dist % runtime->period_size;
1516         if (dist <= frames) {
1517                 snd_pcm_tick_set(substream, 0);
1518                 return;
1519         }
1520         /* the base time is us */
1521         n = frames;
1522         n *= 1000000;
1523         div64_32(&n, runtime->tick_time * runtime->rate, &r);
1524         ticks = n + (r > 0 ? 1 : 0);
1525         if (ticks < runtime->sleep_min)
1526                 ticks = runtime->sleep_min;
1527         snd_pcm_tick_set(substream, (unsigned long) ticks);
1528 }
1529
1530 void snd_pcm_tick_elapsed(struct snd_pcm_substream *substream)
1531 {
1532         struct snd_pcm_runtime *runtime;
1533         unsigned long flags;
1534
1535         snd_assert(substream != NULL, return);
1536         runtime = substream->runtime;
1537         snd_assert(runtime != NULL, return);
1538
1539         snd_pcm_stream_lock_irqsave(substream, flags);
1540         if (!snd_pcm_running(substream) ||
1541             snd_pcm_update_hw_ptr(substream) < 0)
1542                 goto _end;
1543         if (runtime->sleep_min)
1544                 snd_pcm_tick_prepare(substream);
1545  _end:
1546         snd_pcm_stream_unlock_irqrestore(substream, flags);
1547 }
1548
1549 /**
1550  * snd_pcm_period_elapsed - update the pcm status for the next period
1551  * @substream: the pcm substream instance
1552  *
1553  * This function is called from the interrupt handler when the
1554  * PCM has processed the period size.  It will update the current
1555  * pointer, set up the tick, wake up sleepers, etc.
1556  *
1557  * Even if more than one periods have elapsed since the last call, you
1558  * have to call this only once.
1559  */
1560 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1561 {
1562         struct snd_pcm_runtime *runtime;
1563         unsigned long flags;
1564
1565         snd_assert(substream != NULL, return);
1566         runtime = substream->runtime;
1567         snd_assert(runtime != NULL, return);
1568
1569         if (runtime->transfer_ack_begin)
1570                 runtime->transfer_ack_begin(substream);
1571
1572         snd_pcm_stream_lock_irqsave(substream, flags);
1573         if (!snd_pcm_running(substream) ||
1574             snd_pcm_update_hw_ptr_interrupt(substream) < 0)
1575                 goto _end;
1576
1577         if (substream->timer_running)
1578                 snd_timer_interrupt(substream->timer, 1);
1579         if (runtime->sleep_min)
1580                 snd_pcm_tick_prepare(substream);
1581  _end:
1582         snd_pcm_stream_unlock_irqrestore(substream, flags);
1583         if (runtime->transfer_ack_end)
1584                 runtime->transfer_ack_end(substream);
1585         kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1586 }
1587
1588 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1589
1590 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1591                                       unsigned int hwoff,
1592                                       unsigned long data, unsigned int off,
1593                                       snd_pcm_uframes_t frames)
1594 {
1595         struct snd_pcm_runtime *runtime = substream->runtime;
1596         int err;
1597         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1598         if (substream->ops->copy) {
1599                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1600                         return err;
1601         } else {
1602                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1603                 snd_assert(runtime->dma_area, return -EFAULT);
1604                 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1605                         return -EFAULT;
1606         }
1607         return 0;
1608 }
1609
1610 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1611                           unsigned long data, unsigned int off,
1612                           snd_pcm_uframes_t size);
1613
1614 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1615                                             unsigned long data,
1616                                             snd_pcm_uframes_t size,
1617                                             int nonblock,
1618                                             transfer_f transfer)
1619 {
1620         struct snd_pcm_runtime *runtime = substream->runtime;
1621         snd_pcm_uframes_t xfer = 0;
1622         snd_pcm_uframes_t offset = 0;
1623         int err = 0;
1624
1625         if (size == 0)
1626                 return 0;
1627         if (size > runtime->xfer_align)
1628                 size -= size % runtime->xfer_align;
1629
1630         snd_pcm_stream_lock_irq(substream);
1631         switch (runtime->status->state) {
1632         case SNDRV_PCM_STATE_PREPARED:
1633         case SNDRV_PCM_STATE_RUNNING:
1634         case SNDRV_PCM_STATE_PAUSED:
1635                 break;
1636         case SNDRV_PCM_STATE_XRUN:
1637                 err = -EPIPE;
1638                 goto _end_unlock;
1639         case SNDRV_PCM_STATE_SUSPENDED:
1640                 err = -ESTRPIPE;
1641                 goto _end_unlock;
1642         default:
1643                 err = -EBADFD;
1644                 goto _end_unlock;
1645         }
1646
1647         while (size > 0) {
1648                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1649                 snd_pcm_uframes_t avail;
1650                 snd_pcm_uframes_t cont;
1651                 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1652                         snd_pcm_update_hw_ptr(substream);
1653                 avail = snd_pcm_playback_avail(runtime);
1654                 if (((avail < runtime->control->avail_min && size > avail) ||
1655                    (size >= runtime->xfer_align && avail < runtime->xfer_align))) {
1656                         wait_queue_t wait;
1657                         enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
1658                         long tout;
1659
1660                         if (nonblock) {
1661                                 err = -EAGAIN;
1662                                 goto _end_unlock;
1663                         }
1664
1665                         init_waitqueue_entry(&wait, current);
1666                         add_wait_queue(&runtime->sleep, &wait);
1667                         while (1) {
1668                                 if (signal_pending(current)) {
1669                                         state = SIGNALED;
1670                                         break;
1671                                 }
1672                                 set_current_state(TASK_INTERRUPTIBLE);
1673                                 snd_pcm_stream_unlock_irq(substream);
1674                                 tout = schedule_timeout(10 * HZ);
1675                                 snd_pcm_stream_lock_irq(substream);
1676                                 if (tout == 0) {
1677                                         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
1678                                             runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
1679                                                 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
1680                                                 break;
1681                                         }
1682                                 }
1683                                 switch (runtime->status->state) {
1684                                 case SNDRV_PCM_STATE_XRUN:
1685                                 case SNDRV_PCM_STATE_DRAINING:
1686                                         state = ERROR;
1687                                         goto _end_loop;
1688                                 case SNDRV_PCM_STATE_SUSPENDED:
1689                                         state = SUSPENDED;
1690                                         goto _end_loop;
1691                                 case SNDRV_PCM_STATE_SETUP:
1692                                         state = DROPPED;
1693                                         goto _end_loop;
1694                                 default:
1695                                         break;
1696                                 }
1697                                 avail = snd_pcm_playback_avail(runtime);
1698                                 if (avail >= runtime->control->avail_min) {
1699                                         state = READY;
1700                                         break;
1701                                 }
1702                         }
1703                        _end_loop:
1704                         remove_wait_queue(&runtime->sleep, &wait);
1705
1706                         switch (state) {
1707                         case ERROR:
1708                                 err = -EPIPE;
1709                                 goto _end_unlock;
1710                         case SUSPENDED:
1711                                 err = -ESTRPIPE;
1712                                 goto _end_unlock;
1713                         case SIGNALED:
1714                                 err = -ERESTARTSYS;
1715                                 goto _end_unlock;
1716                         case EXPIRED:
1717                                 snd_printd("playback write error (DMA or IRQ trouble?)\n");
1718                                 err = -EIO;
1719                                 goto _end_unlock;
1720                         case DROPPED:
1721                                 err = -EBADFD;
1722                                 goto _end_unlock;
1723                         default:
1724                                 break;
1725                         }
1726                 }
1727                 if (avail > runtime->xfer_align)
1728                         avail -= avail % runtime->xfer_align;
1729                 frames = size > avail ? avail : size;
1730                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1731                 if (frames > cont)
1732                         frames = cont;
1733                 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
1734                 appl_ptr = runtime->control->appl_ptr;
1735                 appl_ofs = appl_ptr % runtime->buffer_size;
1736                 snd_pcm_stream_unlock_irq(substream);
1737                 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
1738                         goto _end;
1739                 snd_pcm_stream_lock_irq(substream);
1740                 switch (runtime->status->state) {
1741                 case SNDRV_PCM_STATE_XRUN:
1742                         err = -EPIPE;
1743                         goto _end_unlock;
1744                 case SNDRV_PCM_STATE_SUSPENDED:
1745                         err = -ESTRPIPE;
1746                         goto _end_unlock;
1747                 default:
1748                         break;
1749                 }
1750                 appl_ptr += frames;
1751                 if (appl_ptr >= runtime->boundary)
1752                         appl_ptr -= runtime->boundary;
1753                 runtime->control->appl_ptr = appl_ptr;
1754                 if (substream->ops->ack)
1755                         substream->ops->ack(substream);
1756
1757                 offset += frames;
1758                 size -= frames;
1759                 xfer += frames;
1760                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1761                     snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1762                         err = snd_pcm_start(substream);
1763                         if (err < 0)
1764                                 goto _end_unlock;
1765                 }
1766                 if (runtime->sleep_min &&
1767                     runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1768                         snd_pcm_tick_prepare(substream);
1769         }
1770  _end_unlock:
1771         snd_pcm_stream_unlock_irq(substream);
1772  _end:
1773         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1774 }
1775
1776 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1777 {
1778         struct snd_pcm_runtime *runtime;
1779         int nonblock;
1780
1781         snd_assert(substream != NULL, return -ENXIO);
1782         runtime = substream->runtime;
1783         snd_assert(runtime != NULL, return -ENXIO);
1784         snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
1785         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1786                 return -EBADFD;
1787
1788         nonblock = !!(substream->f_flags & O_NONBLOCK);
1789
1790         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1791             runtime->channels > 1)
1792                 return -EINVAL;
1793         return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1794                                   snd_pcm_lib_write_transfer);
1795 }
1796
1797 EXPORT_SYMBOL(snd_pcm_lib_write);
1798
1799 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1800                                        unsigned int hwoff,
1801                                        unsigned long data, unsigned int off,
1802                                        snd_pcm_uframes_t frames)
1803 {
1804         struct snd_pcm_runtime *runtime = substream->runtime;
1805         int err;
1806         void __user **bufs = (void __user **)data;
1807         int channels = runtime->channels;
1808         int c;
1809         if (substream->ops->copy) {
1810                 snd_assert(substream->ops->silence != NULL, return -EINVAL);
1811                 for (c = 0; c < channels; ++c, ++bufs) {
1812                         if (*bufs == NULL) {
1813                                 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1814                                         return err;
1815                         } else {
1816                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1817                                 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1818                                         return err;
1819                         }
1820                 }
1821         } else {
1822                 /* default transfer behaviour */
1823                 size_t dma_csize = runtime->dma_bytes / channels;
1824                 snd_assert(runtime->dma_area, return -EFAULT);
1825                 for (c = 0; c < channels; ++c, ++bufs) {
1826                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1827                         if (*bufs == NULL) {
1828                                 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1829                         } else {
1830                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1831                                 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1832                                         return -EFAULT;
1833                         }
1834                 }
1835         }
1836         return 0;
1837 }
1838
1839 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1840                                      void __user **bufs,
1841                                      snd_pcm_uframes_t frames)
1842 {
1843         struct snd_pcm_runtime *runtime;
1844         int nonblock;
1845
1846         snd_assert(substream != NULL, return -ENXIO);
1847         runtime = substream->runtime;
1848         snd_assert(runtime != NULL, return -ENXIO);
1849         snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
1850         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1851                 return -EBADFD;
1852
1853         nonblock = !!(substream->f_flags & O_NONBLOCK);
1854
1855         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1856                 return -EINVAL;
1857         return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1858                                   nonblock, snd_pcm_lib_writev_transfer);
1859 }
1860
1861 EXPORT_SYMBOL(snd_pcm_lib_writev);
1862
1863 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
1864                                      unsigned int hwoff,
1865                                      unsigned long data, unsigned int off,
1866                                      snd_pcm_uframes_t frames)
1867 {
1868         struct snd_pcm_runtime *runtime = substream->runtime;
1869         int err;
1870         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1871         if (substream->ops->copy) {
1872                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1873                         return err;
1874         } else {
1875                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1876                 snd_assert(runtime->dma_area, return -EFAULT);
1877                 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
1878                         return -EFAULT;
1879         }
1880         return 0;
1881 }
1882
1883 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
1884                                            unsigned long data,
1885                                            snd_pcm_uframes_t size,
1886                                            int nonblock,
1887                                            transfer_f transfer)
1888 {
1889         struct snd_pcm_runtime *runtime = substream->runtime;
1890         snd_pcm_uframes_t xfer = 0;
1891         snd_pcm_uframes_t offset = 0;
1892         int err = 0;
1893
1894         if (size == 0)
1895                 return 0;
1896         if (size > runtime->xfer_align)
1897                 size -= size % runtime->xfer_align;
1898
1899         snd_pcm_stream_lock_irq(substream);
1900         switch (runtime->status->state) {
1901         case SNDRV_PCM_STATE_PREPARED:
1902                 if (size >= runtime->start_threshold) {
1903                         err = snd_pcm_start(substream);
1904                         if (err < 0)
1905                                 goto _end_unlock;
1906                 }
1907                 break;
1908         case SNDRV_PCM_STATE_DRAINING:
1909         case SNDRV_PCM_STATE_RUNNING:
1910         case SNDRV_PCM_STATE_PAUSED:
1911                 break;
1912         case SNDRV_PCM_STATE_XRUN:
1913                 err = -EPIPE;
1914                 goto _end_unlock;
1915         case SNDRV_PCM_STATE_SUSPENDED:
1916                 err = -ESTRPIPE;
1917                 goto _end_unlock;
1918         default:
1919                 err = -EBADFD;
1920                 goto _end_unlock;
1921         }
1922
1923         while (size > 0) {
1924                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1925                 snd_pcm_uframes_t avail;
1926                 snd_pcm_uframes_t cont;
1927                 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1928                         snd_pcm_update_hw_ptr(substream);
1929               __draining:
1930                 avail = snd_pcm_capture_avail(runtime);
1931                 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
1932                         if (avail < runtime->xfer_align) {
1933                                 err = -EPIPE;
1934                                 goto _end_unlock;
1935                         }
1936                 } else if ((avail < runtime->control->avail_min && size > avail) ||
1937                            (size >= runtime->xfer_align && avail < runtime->xfer_align)) {
1938                         wait_queue_t wait;
1939                         enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
1940                         long tout;
1941
1942                         if (nonblock) {
1943                                 err = -EAGAIN;
1944                                 goto _end_unlock;
1945                         }
1946
1947                         init_waitqueue_entry(&wait, current);
1948                         add_wait_queue(&runtime->sleep, &wait);
1949                         while (1) {
1950                                 if (signal_pending(current)) {
1951                                         state = SIGNALED;
1952                                         break;
1953                                 }
1954                                 set_current_state(TASK_INTERRUPTIBLE);
1955                                 snd_pcm_stream_unlock_irq(substream);
1956                                 tout = schedule_timeout(10 * HZ);
1957                                 snd_pcm_stream_lock_irq(substream);
1958                                 if (tout == 0) {
1959                                         if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
1960                                             runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
1961                                                 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
1962                                                 break;
1963                                         }
1964                                 }
1965                                 switch (runtime->status->state) {
1966                                 case SNDRV_PCM_STATE_XRUN:
1967                                         state = ERROR;
1968                                         goto _end_loop;
1969                                 case SNDRV_PCM_STATE_SUSPENDED:
1970                                         state = SUSPENDED;
1971                                         goto _end_loop;
1972                                 case SNDRV_PCM_STATE_DRAINING:
1973                                         goto __draining;
1974                                 case SNDRV_PCM_STATE_SETUP:
1975                                         state = DROPPED;
1976                                         goto _end_loop;
1977                                 default:
1978                                         break;
1979                                 }
1980                                 avail = snd_pcm_capture_avail(runtime);
1981                                 if (avail >= runtime->control->avail_min) {
1982                                         state = READY;
1983                                         break;
1984                                 }
1985                         }
1986                        _end_loop:
1987                         remove_wait_queue(&runtime->sleep, &wait);
1988
1989                         switch (state) {
1990                         case ERROR:
1991                                 err = -EPIPE;
1992                                 goto _end_unlock;
1993                         case SUSPENDED:
1994                                 err = -ESTRPIPE;
1995                                 goto _end_unlock;
1996                         case SIGNALED:
1997                                 err = -ERESTARTSYS;
1998                                 goto _end_unlock;
1999                         case EXPIRED:
2000                                 snd_printd("capture read error (DMA or IRQ trouble?)\n");
2001                                 err = -EIO;
2002                                 goto _end_unlock;
2003                         case DROPPED:
2004                                 err = -EBADFD;
2005                                 goto _end_unlock;
2006                         default:
2007                                 break;
2008                         }
2009                 }
2010                 if (avail > runtime->xfer_align)
2011                         avail -= avail % runtime->xfer_align;
2012                 frames = size > avail ? avail : size;
2013                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2014                 if (frames > cont)
2015                         frames = cont;
2016                 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2017                 appl_ptr = runtime->control->appl_ptr;
2018                 appl_ofs = appl_ptr % runtime->buffer_size;
2019                 snd_pcm_stream_unlock_irq(substream);
2020                 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2021                         goto _end;
2022                 snd_pcm_stream_lock_irq(substream);
2023                 switch (runtime->status->state) {
2024                 case SNDRV_PCM_STATE_XRUN:
2025                         err = -EPIPE;
2026                         goto _end_unlock;
2027                 case SNDRV_PCM_STATE_SUSPENDED:
2028                         err = -ESTRPIPE;
2029                         goto _end_unlock;
2030                 default:
2031                         break;
2032                 }
2033                 appl_ptr += frames;
2034                 if (appl_ptr >= runtime->boundary)
2035                         appl_ptr -= runtime->boundary;
2036                 runtime->control->appl_ptr = appl_ptr;
2037                 if (substream->ops->ack)
2038                         substream->ops->ack(substream);
2039
2040                 offset += frames;
2041                 size -= frames;
2042                 xfer += frames;
2043                 if (runtime->sleep_min &&
2044                     runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2045                         snd_pcm_tick_prepare(substream);
2046         }
2047  _end_unlock:
2048         snd_pcm_stream_unlock_irq(substream);
2049  _end:
2050         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2051 }
2052
2053 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2054 {
2055         struct snd_pcm_runtime *runtime;
2056         int nonblock;
2057
2058         snd_assert(substream != NULL, return -ENXIO);
2059         runtime = substream->runtime;
2060         snd_assert(runtime != NULL, return -ENXIO);
2061         snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2062         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2063                 return -EBADFD;
2064
2065         nonblock = !!(substream->f_flags & O_NONBLOCK);
2066         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2067                 return -EINVAL;
2068         return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2069 }
2070
2071 EXPORT_SYMBOL(snd_pcm_lib_read);
2072
2073 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2074                                       unsigned int hwoff,
2075                                       unsigned long data, unsigned int off,
2076                                       snd_pcm_uframes_t frames)
2077 {
2078         struct snd_pcm_runtime *runtime = substream->runtime;
2079         int err;
2080         void __user **bufs = (void __user **)data;
2081         int channels = runtime->channels;
2082         int c;
2083         if (substream->ops->copy) {
2084                 for (c = 0; c < channels; ++c, ++bufs) {
2085                         char __user *buf;
2086                         if (*bufs == NULL)
2087                                 continue;
2088                         buf = *bufs + samples_to_bytes(runtime, off);
2089                         if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2090                                 return err;
2091                 }
2092         } else {
2093                 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2094                 snd_assert(runtime->dma_area, return -EFAULT);
2095                 for (c = 0; c < channels; ++c, ++bufs) {
2096                         char *hwbuf;
2097                         char __user *buf;
2098                         if (*bufs == NULL)
2099                                 continue;
2100
2101                         hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2102                         buf = *bufs + samples_to_bytes(runtime, off);
2103                         if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2104                                 return -EFAULT;
2105                 }
2106         }
2107         return 0;
2108 }
2109
2110 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2111                                     void __user **bufs,
2112                                     snd_pcm_uframes_t frames)
2113 {
2114         struct snd_pcm_runtime *runtime;
2115         int nonblock;
2116
2117         snd_assert(substream != NULL, return -ENXIO);
2118         runtime = substream->runtime;
2119         snd_assert(runtime != NULL, return -ENXIO);
2120         snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2121         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2122                 return -EBADFD;
2123
2124         nonblock = !!(substream->f_flags & O_NONBLOCK);
2125         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2126                 return -EINVAL;
2127         return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2128 }
2129
2130 EXPORT_SYMBOL(snd_pcm_lib_readv);