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 <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, mask)     ((substream)->pstr->xrun_debug & (mask))
 130 #else
 131 #define xrun_debug(substream, mask)     0
 132 #endif
 133
 134 #define dump_stack_on_xrun(substream) do {              \
 135                 if (xrun_debug(substream, 2))           \
 136                         dump_stack();                   \
 137         } while (0)
 138
 139 static void xrun(struct snd_pcm_substream *substream)
 140 {
 141         struct snd_pcm_runtime *runtime = substream->runtime;
 142
 143         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 144                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 145         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 146         if (xrun_debug(substream, 1)) {
 147                 snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n",
 148                            substream->pcm->card->number,
 149                            substream->pcm->device,
 150                            substream->stream ? 'c' : 'p');
 151                 dump_stack_on_xrun(substream);
 152         }
 153 }
 154
 155 static snd_pcm_uframes_t
 156 snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
 157                           struct snd_pcm_runtime *runtime)
 158 {
 159         snd_pcm_uframes_t pos;
 160
 161         pos = substream->ops->pointer(substream);
 162         if (pos == SNDRV_PCM_POS_XRUN)
 163                 return pos; /* XRUN */
 164         if (pos >= runtime->buffer_size) {
 165                 if (printk_ratelimit()) {
 166                         snd_printd(KERN_ERR  "BUG: stream = %i, pos = 0x%lx, "
 167                                    "buffer size = 0x%lx, period size = 0x%lx\n",
 168                                    substream->stream, pos, runtime->buffer_size,
 169                                    runtime->period_size);
 170                 }
 171                 pos = 0;
 172         }
 173         pos -= pos % runtime->min_align;
 174         return pos;
 175 }
 176
 177 static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
 178                                       struct snd_pcm_runtime *runtime)
 179 {
 180         snd_pcm_uframes_t avail;
 181
 182         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 183                 avail = snd_pcm_playback_avail(runtime);
 184         else
 185                 avail = snd_pcm_capture_avail(runtime);
 186         if (avail > runtime->avail_max)
 187                 runtime->avail_max = avail;
 188         if (avail >= runtime->stop_threshold) {
 189                 if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
 190                         snd_pcm_drain_done(substream);
 191                 else
 192                         xrun(substream);
 193                 return -EPIPE;
 194         }
 195         if (avail >= runtime->control->avail_min)
 196                 wake_up(&runtime->sleep);
 197         return 0;
 198 }
 199
 200 #define hw_ptr_error(substream, fmt, args...)                           \
 201         do {                                                            \
 202                 if (xrun_debug(substream, 1)) {                         \
 203                         if (printk_ratelimit()) {                       \
 204                                 snd_printd("PCM: " fmt, ##args);        \
 205                         }                                               \
 206                         dump_stack_on_xrun(substream);                  \
 207                 }                                                       \
 208         } while (0)
 209
 210 static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 211 {
 212         struct snd_pcm_runtime *runtime = substream->runtime;
 213         snd_pcm_uframes_t pos;
 214         snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base;
 215         snd_pcm_sframes_t hdelta, delta;
 216         unsigned long jdelta;
 217
 218         old_hw_ptr = runtime->status->hw_ptr;
 219         pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 220         if (pos == SNDRV_PCM_POS_XRUN) {
 221                 xrun(substream);
 222                 return -EPIPE;
 223         }
 224         hw_base = runtime->hw_ptr_base;
 225         new_hw_ptr = hw_base + pos;
 226         hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
 227         delta = new_hw_ptr - hw_ptr_interrupt;
 228         if (hw_ptr_interrupt >= runtime->boundary) {
 229                 hw_ptr_interrupt -= runtime->boundary;
 230                 if (hw_base < runtime->boundary / 2)
 231                         /* hw_base was already lapped; recalc delta */
 232                         delta = new_hw_ptr - hw_ptr_interrupt;
 233         }
 234         if (delta < 0) {
 235                 delta += runtime->buffer_size;
 236                 if (delta < 0) {
 237                         hw_ptr_error(substream,
 238                                      "Unexpected hw_pointer value "
 239                                      "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
 240                                      substream->stream, (long)pos,
 241                                      (long)hw_ptr_interrupt);
 242                         /* rebase to interrupt position */
 243                         hw_base = new_hw_ptr = hw_ptr_interrupt;
 244                         /* align hw_base to buffer_size */
 245                         hw_base -= hw_base % runtime->buffer_size;
 246                         delta = 0;
 247                 } else {
 248                         hw_base += runtime->buffer_size;
 249                         if (hw_base >= runtime->boundary)
 250                                 hw_base = 0;
 251                         new_hw_ptr = hw_base + pos;
 252                 }
 253         }
 254
 255         /* Do jiffies check only in xrun_debug mode */
 256         if (!xrun_debug(substream, 4))
 257                 goto no_jiffies_check;
 258
 259         /* Skip the jiffies check for hardwares with BATCH flag.
 260          * Such hardware usually just increases the position at each IRQ,
 261          * thus it can't give any strange position.
 262          */
 263         if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
 264                 goto no_jiffies_check;
 265         hdelta = new_hw_ptr - old_hw_ptr;
 266         jdelta = jiffies - runtime->hw_ptr_jiffies;
 267         if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
 268                 delta = jdelta /
 269                         (((runtime->period_size * HZ) / runtime->rate)
 270                                                                 + HZ/100);
 271                 hw_ptr_error(substream,
 272                              "hw_ptr skipping! [Q] "
 273                              "(pos=%ld, delta=%ld, period=%ld, "
 274                              "jdelta=%lu/%lu/%lu)\n",
 275                              (long)pos, (long)hdelta,
 276                              (long)runtime->period_size, jdelta,
 277                              ((hdelta * HZ) / runtime->rate), delta);
 278                 hw_ptr_interrupt = runtime->hw_ptr_interrupt +
 279                                    runtime->period_size * delta;
 280                 if (hw_ptr_interrupt >= runtime->boundary)
 281                         hw_ptr_interrupt -= runtime->boundary;
 282                 /* rebase to interrupt position */
 283                 hw_base = new_hw_ptr = hw_ptr_interrupt;
 284                 /* align hw_base to buffer_size */
 285                 hw_base -= hw_base % runtime->buffer_size;
 286                 delta = 0;
 287         }
 288  no_jiffies_check:
 289         if (delta > runtime->period_size + runtime->period_size / 2) {
 290                 hw_ptr_error(substream,
 291                              "Lost interrupts? "
 292                              "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
 293                              substream->stream, (long)delta,
 294                              (long)hw_ptr_interrupt);
 295                 /* rebase hw_ptr_interrupt */
 296                 hw_ptr_interrupt =
 297                         new_hw_ptr - new_hw_ptr % runtime->period_size;
 298         }
 299         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 300             runtime->silence_size > 0)
 301                 snd_pcm_playback_silence(substream, new_hw_ptr);
 302
 303         if (runtime->status->hw_ptr == new_hw_ptr)
 304                 return 0;
 305
 306         runtime->hw_ptr_base = hw_base;
 307         runtime->status->hw_ptr = new_hw_ptr;
 308         runtime->hw_ptr_jiffies = jiffies;
 309         runtime->hw_ptr_interrupt = hw_ptr_interrupt;
 310         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 311                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 312
 313         return snd_pcm_update_hw_ptr_post(substream, runtime);
 314 }
 315
 316 /* CAUTION: call it with irq disabled */
 317 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 318 {
 319         struct snd_pcm_runtime *runtime = substream->runtime;
 320         snd_pcm_uframes_t pos;
 321         snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
 322         snd_pcm_sframes_t delta;
 323         unsigned long jdelta;
 324
 325         old_hw_ptr = runtime->status->hw_ptr;
 326         pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 327         if (pos == SNDRV_PCM_POS_XRUN) {
 328                 xrun(substream);
 329                 return -EPIPE;
 330         }
 331         hw_base = runtime->hw_ptr_base;
 332         new_hw_ptr = hw_base + pos;
 333
 334         delta = new_hw_ptr - old_hw_ptr;
 335         jdelta = jiffies - runtime->hw_ptr_jiffies;
 336         if (delta < 0) {
 337                 delta += runtime->buffer_size;
 338                 if (delta < 0) {
 339                         hw_ptr_error(substream,
 340                                      "Unexpected hw_pointer value [2] "
 341                                      "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
 342                                      substream->stream, (long)pos,
 343                                      (long)old_hw_ptr, jdelta);
 344                         return 0;
 345                 }
 346                 hw_base += runtime->buffer_size;
 347                 if (hw_base >= runtime->boundary)
 348                         hw_base = 0;
 349                 new_hw_ptr = hw_base + pos;
 350         }
 351         /* Do jiffies check only in xrun_debug mode */
 352         if (xrun_debug(substream, 4) &&
 353             ((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
 354                 hw_ptr_error(substream,
 355                              "hw_ptr skipping! "
 356                              "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
 357                              (long)pos, (long)delta,
 358                              (long)runtime->period_size, jdelta,
 359                              ((delta * HZ) / runtime->rate));
 360                 return 0;
 361         }
 362         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 363             runtime->silence_size > 0)
 364                 snd_pcm_playback_silence(substream, new_hw_ptr);
 365
 366         if (runtime->status->hw_ptr != new_hw_ptr)
 367                 return 0;
 368
 369         runtime->hw_ptr_base = hw_base;
 370         runtime->status->hw_ptr = new_hw_ptr;
 371         runtime->hw_ptr_jiffies = jiffies;
 372         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 373                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 374
 375         return snd_pcm_update_hw_ptr_post(substream, runtime);
 376 }
 377
 378 /**
 379  * snd_pcm_set_ops - set the PCM operators
 380  * @pcm: the pcm instance
 381  * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 382  * @ops: the operator table
 383  *
 384  * Sets the given PCM operators to the pcm instance.
 385  */
 386 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
 387 {
 388         struct snd_pcm_str *stream = &pcm->streams[direction];
 389         struct snd_pcm_substream *substream;
 390
 391         for (substream = stream->substream; substream != NULL; substream = substream->next)
 392                 substream->ops = ops;
 393 }
 394
 395 EXPORT_SYMBOL(snd_pcm_set_ops);
 396
 397 /**
 398  * snd_pcm_sync - set the PCM sync id
 399  * @substream: the pcm substream
 400  *
 401  * Sets the PCM sync identifier for the card.
 402  */
 403 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
 404 {
 405         struct snd_pcm_runtime *runtime = substream->runtime;
 406
 407         runtime->sync.id32[0] = substream->pcm->card->number;
 408         runtime->sync.id32[1] = -1;
 409         runtime->sync.id32[2] = -1;
 410         runtime->sync.id32[3] = -1;
 411 }
 412
 413 EXPORT_SYMBOL(snd_pcm_set_sync);
 414
 415 /*
 416  *  Standard ioctl routine
 417  */
 418
 419 static inline unsigned int div32(unsigned int a, unsigned int b,
 420                                  unsigned int *r)
 421 {
 422         if (b == 0) {
 423                 *r = 0;
 424                 return UINT_MAX;
 425         }
 426         *r = a % b;
 427         return a / b;
 428 }
 429
 430 static inline unsigned int div_down(unsigned int a, unsigned int b)
 431 {
 432         if (b == 0)
 433                 return UINT_MAX;
 434         return a / b;
 435 }
 436
 437 static inline unsigned int div_up(unsigned int a, unsigned int b)
 438 {
 439         unsigned int r;
 440         unsigned int q;
 441         if (b == 0)
 442                 return UINT_MAX;
 443         q = div32(a, b, &r);
 444         if (r)
 445                 ++q;
 446         return q;
 447 }
 448
 449 static inline unsigned int mul(unsigned int a, unsigned int b)
 450 {
 451         if (a == 0)
 452                 return 0;
 453         if (div_down(UINT_MAX, a) < b)
 454                 return UINT_MAX;
 455         return a * b;
 456 }
 457
 458 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
 459                                     unsigned int c, unsigned int *r)
 460 {
 461         u_int64_t n = (u_int64_t) a * b;
 462         if (c == 0) {
 463                 snd_BUG_ON(!n);
 464                 *r = 0;
 465                 return UINT_MAX;
 466         }
 467         div64_32(&n, c, r);
 468         if (n >= UINT_MAX) {
 469                 *r = 0;
 470                 return UINT_MAX;
 471         }
 472         return n;
 473 }
 474
 475 /**
 476  * snd_interval_refine - refine the interval value of configurator
 477  * @i: the interval value to refine
 478  * @v: the interval value to refer to
 479  *
 480  * Refines the interval value with the reference value.
 481  * The interval is changed to the range satisfying both intervals.
 482  * The interval status (min, max, integer, etc.) are evaluated.
 483  *
 484  * Returns non-zero if the value is changed, zero if not changed.
 485  */
 486 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
 487 {
 488         int changed = 0;
 489         if (snd_BUG_ON(snd_interval_empty(i)))
 490                 return -EINVAL;
 491         if (i->min < v->min) {
 492                 i->min = v->min;
 493                 i->openmin = v->openmin;
 494                 changed = 1;
 495         } else if (i->min == v->min && !i->openmin && v->openmin) {
 496                 i->openmin = 1;
 497                 changed = 1;
 498         }
 499         if (i->max > v->max) {
 500                 i->max = v->max;
 501                 i->openmax = v->openmax;
 502                 changed = 1;
 503         } else if (i->max == v->max && !i->openmax && v->openmax) {
 504                 i->openmax = 1;
 505                 changed = 1;
 506         }
 507         if (!i->integer && v->integer) {
 508                 i->integer = 1;
 509                 changed = 1;
 510         }
 511         if (i->integer) {
 512                 if (i->openmin) {
 513                         i->min++;
 514                         i->openmin = 0;
 515                 }
 516                 if (i->openmax) {
 517                         i->max--;
 518                         i->openmax = 0;
 519                 }
 520         } else if (!i->openmin && !i->openmax && i->min == i->max)
 521                 i->integer = 1;
 522         if (snd_interval_checkempty(i)) {
 523                 snd_interval_none(i);
 524                 return -EINVAL;
 525         }
 526         return changed;
 527 }
 528
 529 EXPORT_SYMBOL(snd_interval_refine);
 530
 531 static int snd_interval_refine_first(struct snd_interval *i)
 532 {
 533         if (snd_BUG_ON(snd_interval_empty(i)))
 534                 return -EINVAL;
 535         if (snd_interval_single(i))
 536                 return 0;
 537         i->max = i->min;
 538         i->openmax = i->openmin;
 539         if (i->openmax)
 540                 i->max++;
 541         return 1;
 542 }
 543
 544 static int snd_interval_refine_last(struct snd_interval *i)
 545 {
 546         if (snd_BUG_ON(snd_interval_empty(i)))
 547                 return -EINVAL;
 548         if (snd_interval_single(i))
 549                 return 0;
 550         i->min = i->max;
 551         i->openmin = i->openmax;
 552         if (i->openmin)
 553                 i->min--;
 554         return 1;
 555 }
 556
 557 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 558 {
 559         if (a->empty || b->empty) {
 560                 snd_interval_none(c);
 561                 return;
 562         }
 563         c->empty = 0;
 564         c->min = mul(a->min, b->min);
 565         c->openmin = (a->openmin || b->openmin);
 566         c->max = mul(a->max,  b->max);
 567         c->openmax = (a->openmax || b->openmax);
 568         c->integer = (a->integer && b->integer);
 569 }
 570
 571 /**
 572  * snd_interval_div - refine the interval value with division
 573  * @a: dividend
 574  * @b: divisor
 575  * @c: quotient
 576  *
 577  * c = a / b
 578  *
 579  * Returns non-zero if the value is changed, zero if not changed.
 580  */
 581 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 582 {
 583         unsigned int r;
 584         if (a->empty || b->empty) {
 585                 snd_interval_none(c);
 586                 return;
 587         }
 588         c->empty = 0;
 589         c->min = div32(a->min, b->max, &r);
 590         c->openmin = (r || a->openmin || b->openmax);
 591         if (b->min > 0) {
 592                 c->max = div32(a->max, b->min, &r);
 593                 if (r) {
 594                         c->max++;
 595                         c->openmax = 1;
 596                 } else
 597                         c->openmax = (a->openmax || b->openmin);
 598         } else {
 599                 c->max = UINT_MAX;
 600                 c->openmax = 0;
 601         }
 602         c->integer = 0;
 603 }
 604
 605 /**
 606  * snd_interval_muldivk - refine the interval value
 607  * @a: dividend 1
 608  * @b: dividend 2
 609  * @k: divisor (as integer)
 610  * @c: result
 611   *
 612  * c = a * b / k
 613  *
 614  * Returns non-zero if the value is changed, zero if not changed.
 615  */
 616 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 617                       unsigned int k, struct snd_interval *c)
 618 {
 619         unsigned int r;
 620         if (a->empty || b->empty) {
 621                 snd_interval_none(c);
 622                 return;
 623         }
 624         c->empty = 0;
 625         c->min = muldiv32(a->min, b->min, k, &r);
 626         c->openmin = (r || a->openmin || b->openmin);
 627         c->max = muldiv32(a->max, b->max, k, &r);
 628         if (r) {
 629                 c->max++;
 630                 c->openmax = 1;
 631         } else
 632                 c->openmax = (a->openmax || b->openmax);
 633         c->integer = 0;
 634 }
 635
 636 /**
 637  * snd_interval_mulkdiv - refine the interval value
 638  * @a: dividend 1
 639  * @k: dividend 2 (as integer)
 640  * @b: divisor
 641  * @c: result
 642  *
 643  * c = a * k / b
 644  *
 645  * Returns non-zero if the value is changed, zero if not changed.
 646  */
 647 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 648                       const struct snd_interval *b, struct snd_interval *c)
 649 {
 650         unsigned int r;
 651         if (a->empty || b->empty) {
 652                 snd_interval_none(c);
 653                 return;
 654         }
 655         c->empty = 0;
 656         c->min = muldiv32(a->min, k, b->max, &r);
 657         c->openmin = (r || a->openmin || b->openmax);
 658         if (b->min > 0) {
 659                 c->max = muldiv32(a->max, k, b->min, &r);
 660                 if (r) {
 661                         c->max++;
 662                         c->openmax = 1;
 663                 } else
 664                         c->openmax = (a->openmax || b->openmin);
 665         } else {
 666                 c->max = UINT_MAX;
 667                 c->openmax = 0;
 668         }
 669         c->integer = 0;
 670 }
 671
 672 /* ---- */
 673
 674
 675 /**
 676  * snd_interval_ratnum - refine the interval value
 677  * @i: interval to refine
 678  * @rats_count: number of ratnum_t
 679  * @rats: ratnum_t array
 680  * @nump: pointer to store the resultant numerator
 681  * @denp: pointer to store the resultant denominator
 682  *
 683  * Returns non-zero if the value is changed, zero if not changed.
 684  */
 685 int snd_interval_ratnum(struct snd_interval *i,
 686                         unsigned int rats_count, struct snd_ratnum *rats,
 687                         unsigned int *nump, unsigned int *denp)
 688 {
 689         unsigned int best_num, best_diff, best_den;
 690         unsigned int k;
 691         struct snd_interval t;
 692         int err;
 693
 694         best_num = best_den = best_diff = 0;
 695         for (k = 0; k < rats_count; ++k) {
 696                 unsigned int num = rats[k].num;
 697                 unsigned int den;
 698                 unsigned int q = i->min;
 699                 int diff;
 700                 if (q == 0)
 701                         q = 1;
 702                 den = div_down(num, q);
 703                 if (den < rats[k].den_min)
 704                         continue;
 705                 if (den > rats[k].den_max)
 706                         den = rats[k].den_max;
 707                 else {
 708                         unsigned int r;
 709                         r = (den - rats[k].den_min) % rats[k].den_step;
 710                         if (r != 0)
 711                                 den -= r;
 712                 }
 713                 diff = num - q * den;
 714                 if (best_num == 0 ||
 715                     diff * best_den < best_diff * den) {
 716                         best_diff = diff;
 717                         best_den = den;
 718                         best_num = num;
 719                 }
 720         }
 721         if (best_den == 0) {
 722                 i->empty = 1;
 723                 return -EINVAL;
 724         }
 725         t.min = div_down(best_num, best_den);
 726         t.openmin = !!(best_num % best_den);
 727
 728         best_num = best_den = best_diff = 0;
 729         for (k = 0; k < rats_count; ++k) {
 730                 unsigned int num = rats[k].num;
 731                 unsigned int den;
 732                 unsigned int q = i->max;
 733                 int diff;
 734                 if (q == 0) {
 735                         i->empty = 1;
 736                         return -EINVAL;
 737                 }
 738                 den = div_up(num, q);
 739                 if (den > rats[k].den_max)
 740                         continue;
 741                 if (den < rats[k].den_min)
 742                         den = rats[k].den_min;
 743                 else {
 744                         unsigned int r;
 745                         r = (den - rats[k].den_min) % rats[k].den_step;
 746                         if (r != 0)
 747                                 den += rats[k].den_step - r;
 748                 }
 749                 diff = q * den - num;
 750                 if (best_num == 0 ||
 751                     diff * best_den < best_diff * den) {
 752                         best_diff = diff;
 753                         best_den = den;
 754                         best_num = num;
 755                 }
 756         }
 757         if (best_den == 0) {
 758                 i->empty = 1;
 759                 return -EINVAL;
 760         }
 761         t.max = div_up(best_num, best_den);
 762         t.openmax = !!(best_num % best_den);
 763         t.integer = 0;
 764         err = snd_interval_refine(i, &t);
 765         if (err < 0)
 766                 return err;
 767
 768         if (snd_interval_single(i)) {
 769                 if (nump)
 770                         *nump = best_num;
 771                 if (denp)
 772                         *denp = best_den;
 773         }
 774         return err;
 775 }
 776
 777 EXPORT_SYMBOL(snd_interval_ratnum);
 778
 779 /**
 780  * snd_interval_ratden - refine the interval value
 781  * @i: interval to refine
 782  * @rats_count: number of struct ratden
 783  * @rats: struct ratden array
 784  * @nump: pointer to store the resultant numerator
 785  * @denp: pointer to store the resultant denominator
 786  *
 787  * Returns non-zero if the value is changed, zero if not changed.
 788  */
 789 static int snd_interval_ratden(struct snd_interval *i,
 790                                unsigned int rats_count, struct snd_ratden *rats,
 791                                unsigned int *nump, unsigned int *denp)
 792 {
 793         unsigned int best_num, best_diff, best_den;
 794         unsigned int k;
 795         struct snd_interval t;
 796         int err;
 797
 798         best_num = best_den = best_diff = 0;
 799         for (k = 0; k < rats_count; ++k) {
 800                 unsigned int num;
 801                 unsigned int den = rats[k].den;
 802                 unsigned int q = i->min;
 803                 int diff;
 804                 num = mul(q, den);
 805                 if (num > rats[k].num_max)
 806                         continue;
 807                 if (num < rats[k].num_min)
 808                         num = rats[k].num_max;
 809                 else {
 810                         unsigned int r;
 811                         r = (num - rats[k].num_min) % rats[k].num_step;
 812                         if (r != 0)
 813                                 num += rats[k].num_step - r;
 814                 }
 815                 diff = num - q * den;
 816                 if (best_num == 0 ||
 817                     diff * best_den < best_diff * den) {
 818                         best_diff = diff;
 819                         best_den = den;
 820                         best_num = num;
 821                 }
 822         }
 823         if (best_den == 0) {
 824                 i->empty = 1;
 825                 return -EINVAL;
 826         }
 827         t.min = div_down(best_num, best_den);
 828         t.openmin = !!(best_num % best_den);
 829
 830         best_num = best_den = best_diff = 0;
 831         for (k = 0; k < rats_count; ++k) {
 832                 unsigned int num;
 833                 unsigned int den = rats[k].den;
 834                 unsigned int q = i->max;
 835                 int diff;
 836                 num = mul(q, den);
 837                 if (num < rats[k].num_min)
 838                         continue;
 839                 if (num > rats[k].num_max)
 840                         num = rats[k].num_max;
 841                 else {
 842                         unsigned int r;
 843                         r = (num - rats[k].num_min) % rats[k].num_step;
 844                         if (r != 0)
 845                                 num -= r;
 846                 }
 847                 diff = q * den - num;
 848                 if (best_num == 0 ||
 849                     diff * best_den < best_diff * den) {
 850                         best_diff = diff;
 851                         best_den = den;
 852                         best_num = num;
 853                 }
 854         }
 855         if (best_den == 0) {
 856                 i->empty = 1;
 857                 return -EINVAL;
 858         }
 859         t.max = div_up(best_num, best_den);
 860         t.openmax = !!(best_num % best_den);
 861         t.integer = 0;
 862         err = snd_interval_refine(i, &t);
 863         if (err < 0)
 864                 return err;
 865
 866         if (snd_interval_single(i)) {
 867                 if (nump)
 868                         *nump = best_num;
 869                 if (denp)
 870                         *denp = best_den;
 871         }
 872         return err;
 873 }
 874
 875 /**
 876  * snd_interval_list - refine the interval value from the list
 877  * @i: the interval value to refine
 878  * @count: the number of elements in the list
 879  * @list: the value list
 880  * @mask: the bit-mask to evaluate
 881  *
 882  * Refines the interval value from the list.
 883  * When mask is non-zero, only the elements corresponding to bit 1 are
 884  * evaluated.
 885  *
 886  * Returns non-zero if the value is changed, zero if not changed.
 887  */
 888 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
 889 {
 890         unsigned int k;
 891         int changed = 0;
 892
 893         if (!count) {
 894                 i->empty = 1;
 895                 return -EINVAL;
 896         }
 897         for (k = 0; k < count; k++) {
 898                 if (mask && !(mask & (1 << k)))
 899                         continue;
 900                 if (i->min == list[k] && !i->openmin)
 901                         goto _l1;
 902                 if (i->min < list[k]) {
 903                         i->min = list[k];
 904                         i->openmin = 0;
 905                         changed = 1;
 906                         goto _l1;
 907                 }
 908         }
 909         i->empty = 1;
 910         return -EINVAL;
 911  _l1:
 912         for (k = count; k-- > 0;) {
 913                 if (mask && !(mask & (1 << k)))
 914                         continue;
 915                 if (i->max == list[k] && !i->openmax)
 916                         goto _l2;
 917                 if (i->max > list[k]) {
 918                         i->max = list[k];
 919                         i->openmax = 0;
 920                         changed = 1;
 921                         goto _l2;
 922                 }
 923         }
 924         i->empty = 1;
 925         return -EINVAL;
 926  _l2:
 927         if (snd_interval_checkempty(i)) {
 928                 i->empty = 1;
 929                 return -EINVAL;
 930         }
 931         return changed;
 932 }
 933
 934 EXPORT_SYMBOL(snd_interval_list);
 935
 936 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
 937 {
 938         unsigned int n;
 939         int changed = 0;
 940         n = (i->min - min) % step;
 941         if (n != 0 || i->openmin) {
 942                 i->min += step - n;
 943                 changed = 1;
 944         }
 945         n = (i->max - min) % step;
 946         if (n != 0 || i->openmax) {
 947                 i->max -= n;
 948                 changed = 1;
 949         }
 950         if (snd_interval_checkempty(i)) {
 951                 i->empty = 1;
 952                 return -EINVAL;
 953         }
 954         return changed;
 955 }
 956
 957 /* Info constraints helpers */
 958
 959 /**
 960  * snd_pcm_hw_rule_add - add the hw-constraint rule
 961  * @runtime: the pcm runtime instance
 962  * @cond: condition bits
 963  * @var: the variable to evaluate
 964  * @func: the evaluation function
 965  * @private: the private data pointer passed to function
 966  * @dep: the dependent variables
 967  *
 968  * Returns zero if successful, or a negative error code on failure.
 969  */
 970 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
 971                         int var,
 972                         snd_pcm_hw_rule_func_t func, void *private,
 973                         int dep, ...)
 974 {
 975         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
 976         struct snd_pcm_hw_rule *c;
 977         unsigned int k;
 978         va_list args;
 979         va_start(args, dep);
 980         if (constrs->rules_num >= constrs->rules_all) {
 981                 struct snd_pcm_hw_rule *new;
 982                 unsigned int new_rules = constrs->rules_all + 16;
 983                 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
 984                 if (!new)
 985                         return -ENOMEM;
 986                 if (constrs->rules) {
 987                         memcpy(new, constrs->rules,
 988                                constrs->rules_num * sizeof(*c));
 989                         kfree(constrs->rules);
 990                 }
 991                 constrs->rules = new;
 992                 constrs->rules_all = new_rules;
 993         }
 994         c = &constrs->rules[constrs->rules_num];
 995         c->cond = cond;
 996         c->func = func;
 997         c->var = var;
 998         c->private = private;
 999         k = 0;
1000         while (1) {
1001                 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
1002                         return -EINVAL;
1003                 c->deps[k++] = dep;
1004                 if (dep < 0)
1005                         break;
1006                 dep = va_arg(args, int);
1007         }
1008         constrs->rules_num++;
1009         va_end(args);
1010         return 0;
1011 }
1012
1013 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1014
1015 /**
1016  * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1017  * @runtime: PCM runtime instance
1018  * @var: hw_params variable to apply the mask
1019  * @mask: the bitmap mask
1020  *
1021  * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1022  */
1023 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1024                                u_int32_t mask)
1025 {
1026         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1027         struct snd_mask *maskp = constrs_mask(constrs, var);
1028         *maskp->bits &= mask;
1029         memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1030         if (*maskp->bits == 0)
1031                 return -EINVAL;
1032         return 0;
1033 }
1034
1035 /**
1036  * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1037  * @runtime: PCM runtime instance
1038  * @var: hw_params variable to apply the mask
1039  * @mask: the 64bit bitmap mask
1040  *
1041  * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1042  */
1043 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1044                                  u_int64_t mask)
1045 {
1046         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1047         struct snd_mask *maskp = constrs_mask(constrs, var);
1048         maskp->bits[0] &= (u_int32_t)mask;
1049         maskp->bits[1] &= (u_int32_t)(mask >> 32);
1050         memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1051         if (! maskp->bits[0] && ! maskp->bits[1])
1052                 return -EINVAL;
1053         return 0;
1054 }
1055
1056 /**
1057  * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1058  * @runtime: PCM runtime instance
1059  * @var: hw_params variable to apply the integer constraint
1060  *
1061  * Apply the constraint of integer to an interval parameter.
1062  */
1063 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1064 {
1065         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1066         return snd_interval_setinteger(constrs_interval(constrs, var));
1067 }
1068
1069 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1070
1071 /**
1072  * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1073  * @runtime: PCM runtime instance
1074  * @var: hw_params variable to apply the range
1075  * @min: the minimal value
1076  * @max: the maximal value
1077  *
1078  * Apply the min/max range constraint to an interval parameter.
1079  */
1080 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1081                                  unsigned int min, unsigned int max)
1082 {
1083         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1084         struct snd_interval t;
1085         t.min = min;
1086         t.max = max;
1087         t.openmin = t.openmax = 0;
1088         t.integer = 0;
1089         return snd_interval_refine(constrs_interval(constrs, var), &t);
1090 }
1091
1092 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1093
1094 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1095                                 struct snd_pcm_hw_rule *rule)
1096 {
1097         struct snd_pcm_hw_constraint_list *list = rule->private;
1098         return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1099 }
1100
1101
1102 /**
1103  * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1104  * @runtime: PCM runtime instance
1105  * @cond: condition bits
1106  * @var: hw_params variable to apply the list constraint
1107  * @l: list
1108  *
1109  * Apply the list of constraints to an interval parameter.
1110  */
1111 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1112                                unsigned int cond,
1113                                snd_pcm_hw_param_t var,
1114                                struct snd_pcm_hw_constraint_list *l)
1115 {
1116         return snd_pcm_hw_rule_add(runtime, cond, var,
1117                                    snd_pcm_hw_rule_list, l,
1118                                    var, -1);
1119 }
1120
1121 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1122
1123 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1124                                    struct snd_pcm_hw_rule *rule)
1125 {
1126         struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1127         unsigned int num = 0, den = 0;
1128         int err;
1129         err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1130                                   r->nrats, r->rats, &num, &den);
1131         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1132                 params->rate_num = num;
1133                 params->rate_den = den;
1134         }
1135         return err;
1136 }
1137
1138 /**
1139  * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1140  * @runtime: PCM runtime instance
1141  * @cond: condition bits
1142  * @var: hw_params variable to apply the ratnums constraint
1143  * @r: struct snd_ratnums constriants
1144  */
1145 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1146                                   unsigned int cond,
1147                                   snd_pcm_hw_param_t var,
1148                                   struct snd_pcm_hw_constraint_ratnums *r)
1149 {
1150         return snd_pcm_hw_rule_add(runtime, cond, var,
1151                                    snd_pcm_hw_rule_ratnums, r,
1152                                    var, -1);
1153 }
1154
1155 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1156
1157 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1158                                    struct snd_pcm_hw_rule *rule)
1159 {
1160         struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1161         unsigned int num = 0, den = 0;
1162         int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1163                                   r->nrats, r->rats, &num, &den);
1164         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1165                 params->rate_num = num;
1166                 params->rate_den = den;
1167         }
1168         return err;
1169 }
1170
1171 /**
1172  * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1173  * @runtime: PCM runtime instance
1174  * @cond: condition bits
1175  * @var: hw_params variable to apply the ratdens constraint
1176  * @r: struct snd_ratdens constriants
1177  */
1178 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1179                                   unsigned int cond,
1180                                   snd_pcm_hw_param_t var,
1181                                   struct snd_pcm_hw_constraint_ratdens *r)
1182 {
1183         return snd_pcm_hw_rule_add(runtime, cond, var,
1184                                    snd_pcm_hw_rule_ratdens, r,
1185                                    var, -1);
1186 }
1187
1188 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1189
1190 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1191                                   struct snd_pcm_hw_rule *rule)
1192 {
1193         unsigned int l = (unsigned long) rule->private;
1194         int width = l & 0xffff;
1195         unsigned int msbits = l >> 16;
1196         struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1197         if (snd_interval_single(i) && snd_interval_value(i) == width)
1198                 params->msbits = msbits;
1199         return 0;
1200 }
1201
1202 /**
1203  * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1204  * @runtime: PCM runtime instance
1205  * @cond: condition bits
1206  * @width: sample bits width
1207  * @msbits: msbits width
1208  */
1209 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1210                                  unsigned int cond,
1211                                  unsigned int width,
1212                                  unsigned int msbits)
1213 {
1214         unsigned long l = (msbits << 16) | width;
1215         return snd_pcm_hw_rule_add(runtime, cond, -1,
1216                                     snd_pcm_hw_rule_msbits,
1217                                     (void*) l,
1218                                     SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1219 }
1220
1221 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1222
1223 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1224                                 struct snd_pcm_hw_rule *rule)
1225 {
1226         unsigned long step = (unsigned long) rule->private;
1227         return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1228 }
1229
1230 /**
1231  * snd_pcm_hw_constraint_step - add a hw constraint step rule
1232  * @runtime: PCM runtime instance
1233  * @cond: condition bits
1234  * @var: hw_params variable to apply the step constraint
1235  * @step: step size
1236  */
1237 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1238                                unsigned int cond,
1239                                snd_pcm_hw_param_t var,
1240                                unsigned long step)
1241 {
1242         return snd_pcm_hw_rule_add(runtime, cond, var,
1243                                    snd_pcm_hw_rule_step, (void *) step,
1244                                    var, -1);
1245 }
1246
1247 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1248
1249 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1250 {
1251         static unsigned int pow2_sizes[] = {
1252                 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1253                 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1254                 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1255                 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1256         };
1257         return snd_interval_list(hw_param_interval(params, rule->var),
1258                                  ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1259 }
1260
1261 /**
1262  * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1263  * @runtime: PCM runtime instance
1264  * @cond: condition bits
1265  * @var: hw_params variable to apply the power-of-2 constraint
1266  */
1267 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1268                                unsigned int cond,
1269                                snd_pcm_hw_param_t var)
1270 {
1271         return snd_pcm_hw_rule_add(runtime, cond, var,
1272                                    snd_pcm_hw_rule_pow2, NULL,
1273                                    var, -1);
1274 }
1275
1276 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1277
1278 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1279                                   snd_pcm_hw_param_t var)
1280 {
1281         if (hw_is_mask(var)) {
1282                 snd_mask_any(hw_param_mask(params, var));
1283                 params->cmask |= 1 << var;
1284                 params->rmask |= 1 << var;
1285                 return;
1286         }
1287         if (hw_is_interval(var)) {
1288                 snd_interval_any(hw_param_interval(params, var));
1289                 params->cmask |= 1 << var;
1290                 params->rmask |= 1 << var;
1291                 return;
1292         }
1293         snd_BUG();
1294 }
1295
1296 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1297 {
1298         unsigned int k;
1299         memset(params, 0, sizeof(*params));
1300         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1301                 _snd_pcm_hw_param_any(params, k);
1302         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1303                 _snd_pcm_hw_param_any(params, k);
1304         params->info = ~0U;
1305 }
1306
1307 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1308
1309 /**
1310  * snd_pcm_hw_param_value - return @params field @var value
1311  * @params: the hw_params instance
1312  * @var: parameter to retrieve
1313  * @dir: pointer to the direction (-1,0,1) or %NULL
1314  *
1315  * Return the value for field @var if it's fixed in configuration space
1316  * defined by @params. Return -%EINVAL otherwise.
1317  */
1318 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1319                            snd_pcm_hw_param_t var, int *dir)
1320 {
1321         if (hw_is_mask(var)) {
1322                 const struct snd_mask *mask = hw_param_mask_c(params, var);
1323                 if (!snd_mask_single(mask))
1324                         return -EINVAL;
1325                 if (dir)
1326                         *dir = 0;
1327                 return snd_mask_value(mask);
1328         }
1329         if (hw_is_interval(var)) {
1330                 const struct snd_interval *i = hw_param_interval_c(params, var);
1331                 if (!snd_interval_single(i))
1332                         return -EINVAL;
1333                 if (dir)
1334                         *dir = i->openmin;
1335                 return snd_interval_value(i);
1336         }
1337         return -EINVAL;
1338 }
1339
1340 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1341
1342 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1343                                 snd_pcm_hw_param_t var)
1344 {
1345         if (hw_is_mask(var)) {
1346                 snd_mask_none(hw_param_mask(params, var));
1347                 params->cmask |= 1 << var;
1348                 params->rmask |= 1 << var;
1349         } else if (hw_is_interval(var)) {
1350                 snd_interval_none(hw_param_interval(params, var));
1351                 params->cmask |= 1 << var;
1352                 params->rmask |= 1 << var;
1353         } else {
1354                 snd_BUG();
1355         }
1356 }
1357
1358 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1359
1360 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1361                                    snd_pcm_hw_param_t var)
1362 {
1363         int changed;
1364         if (hw_is_mask(var))
1365                 changed = snd_mask_refine_first(hw_param_mask(params, var));
1366         else if (hw_is_interval(var))
1367                 changed = snd_interval_refine_first(hw_param_interval(params, var));
1368         else
1369                 return -EINVAL;
1370         if (changed) {
1371                 params->cmask |= 1 << var;
1372                 params->rmask |= 1 << var;
1373         }
1374         return changed;
1375 }
1376
1377
1378 /**
1379  * snd_pcm_hw_param_first - refine config space and return minimum value
1380  * @pcm: PCM instance
1381  * @params: the hw_params instance
1382  * @var: parameter to retrieve
1383  * @dir: pointer to the direction (-1,0,1) or %NULL
1384  *
1385  * Inside configuration space defined by @params remove from @var all
1386  * values > minimum. Reduce configuration space accordingly.
1387  * Return the minimum.
1388  */
1389 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1390                            struct snd_pcm_hw_params *params,
1391                            snd_pcm_hw_param_t var, int *dir)
1392 {
1393         int changed = _snd_pcm_hw_param_first(params, var);
1394         if (changed < 0)
1395                 return changed;
1396         if (params->rmask) {
1397                 int err = snd_pcm_hw_refine(pcm, params);
1398                 if (snd_BUG_ON(err < 0))
1399                         return err;
1400         }
1401         return snd_pcm_hw_param_value(params, var, dir);
1402 }
1403
1404 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1405
1406 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1407                                   snd_pcm_hw_param_t var)
1408 {
1409         int changed;
1410         if (hw_is_mask(var))
1411                 changed = snd_mask_refine_last(hw_param_mask(params, var));
1412         else if (hw_is_interval(var))
1413                 changed = snd_interval_refine_last(hw_param_interval(params, var));
1414         else
1415                 return -EINVAL;
1416         if (changed) {
1417                 params->cmask |= 1 << var;
1418                 params->rmask |= 1 << var;
1419         }
1420         return changed;
1421 }
1422
1423
1424 /**
1425  * snd_pcm_hw_param_last - refine config space and return maximum value
1426  * @pcm: PCM instance
1427  * @params: the hw_params instance
1428  * @var: parameter to retrieve
1429  * @dir: pointer to the direction (-1,0,1) or %NULL
1430  *
1431  * Inside configuration space defined by @params remove from @var all
1432  * values < maximum. Reduce configuration space accordingly.
1433  * Return the maximum.
1434  */
1435 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1436                           struct snd_pcm_hw_params *params,
1437                           snd_pcm_hw_param_t var, int *dir)
1438 {
1439         int changed = _snd_pcm_hw_param_last(params, var);
1440         if (changed < 0)
1441                 return changed;
1442         if (params->rmask) {
1443                 int err = snd_pcm_hw_refine(pcm, params);
1444                 if (snd_BUG_ON(err < 0))
1445                         return err;
1446         }
1447         return snd_pcm_hw_param_value(params, var, dir);
1448 }
1449
1450 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1451
1452 /**
1453  * snd_pcm_hw_param_choose - choose a configuration defined by @params
1454  * @pcm: PCM instance
1455  * @params: the hw_params instance
1456  *
1457  * Choose one configuration from configuration space defined by @params.
1458  * The configuration chosen is that obtained fixing in this order:
1459  * first access, first format, first subformat, min channels,
1460  * min rate, min period time, max buffer size, min tick time
1461  */
1462 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1463                              struct snd_pcm_hw_params *params)
1464 {
1465         static int vars[] = {
1466                 SNDRV_PCM_HW_PARAM_ACCESS,
1467                 SNDRV_PCM_HW_PARAM_FORMAT,
1468                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1469                 SNDRV_PCM_HW_PARAM_CHANNELS,
1470                 SNDRV_PCM_HW_PARAM_RATE,
1471                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1472                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1473                 SNDRV_PCM_HW_PARAM_TICK_TIME,
1474                 -1
1475         };
1476         int err, *v;
1477
1478         for (v = vars; *v != -1; v++) {
1479                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1480                         err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1481                 else
1482                         err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1483                 if (snd_BUG_ON(err < 0))
1484                         return err;
1485         }
1486         return 0;
1487 }
1488
1489 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1490                                    void *arg)
1491 {
1492         struct snd_pcm_runtime *runtime = substream->runtime;
1493         unsigned long flags;
1494         snd_pcm_stream_lock_irqsave(substream, flags);
1495         if (snd_pcm_running(substream) &&
1496             snd_pcm_update_hw_ptr(substream) >= 0)
1497                 runtime->status->hw_ptr %= runtime->buffer_size;
1498         else
1499                 runtime->status->hw_ptr = 0;
1500         snd_pcm_stream_unlock_irqrestore(substream, flags);
1501         return 0;
1502 }
1503
1504 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1505                                           void *arg)
1506 {
1507         struct snd_pcm_channel_info *info = arg;
1508         struct snd_pcm_runtime *runtime = substream->runtime;
1509         int width;
1510         if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1511                 info->offset = -1;
1512                 return 0;
1513         }
1514         width = snd_pcm_format_physical_width(runtime->format);
1515         if (width < 0)
1516                 return width;
1517         info->offset = 0;
1518         switch (runtime->access) {
1519         case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1520         case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1521                 info->first = info->channel * width;
1522                 info->step = runtime->channels * width;
1523                 break;
1524         case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1525         case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1526         {
1527                 size_t size = runtime->dma_bytes / runtime->channels;
1528                 info->first = info->channel * size * 8;
1529                 info->step = width;
1530                 break;
1531         }
1532         default:
1533                 snd_BUG();
1534                 break;
1535         }
1536         return 0;
1537 }
1538
1539 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1540                                        void *arg)
1541 {
1542         struct snd_pcm_hw_params *params = arg;
1543         snd_pcm_format_t format;
1544         int channels, width;
1545
1546         params->fifo_size = substream->runtime->hw.fifo_size;
1547         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1548                 format = params_format(params);
1549                 channels = params_channels(params);
1550                 width = snd_pcm_format_physical_width(format);
1551                 params->fifo_size /= width * channels;
1552         }
1553         return 0;
1554 }
1555
1556 /**
1557  * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1558  * @substream: the pcm substream instance
1559  * @cmd: ioctl command
1560  * @arg: ioctl argument
1561  *
1562  * Processes the generic ioctl commands for PCM.
1563  * Can be passed as the ioctl callback for PCM ops.
1564  *
1565  * Returns zero if successful, or a negative error code on failure.
1566  */
1567 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1568                       unsigned int cmd, void *arg)
1569 {
1570         switch (cmd) {
1571         case SNDRV_PCM_IOCTL1_INFO:
1572                 return 0;
1573         case SNDRV_PCM_IOCTL1_RESET:
1574                 return snd_pcm_lib_ioctl_reset(substream, arg);
1575         case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1576                 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1577         case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1578                 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1579         }
1580         return -ENXIO;
1581 }
1582
1583 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1584
1585 /**
1586  * snd_pcm_period_elapsed - update the pcm status for the next period
1587  * @substream: the pcm substream instance
1588  *
1589  * This function is called from the interrupt handler when the
1590  * PCM has processed the period size.  It will update the current
1591  * pointer, wake up sleepers, etc.
1592  *
1593  * Even if more than one periods have elapsed since the last call, you
1594  * have to call this only once.
1595  */
1596 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1597 {
1598         struct snd_pcm_runtime *runtime;
1599         unsigned long flags;
1600
1601         if (PCM_RUNTIME_CHECK(substream))
1602                 return;
1603         runtime = substream->runtime;
1604
1605         if (runtime->transfer_ack_begin)
1606                 runtime->transfer_ack_begin(substream);
1607
1608         snd_pcm_stream_lock_irqsave(substream, flags);
1609         if (!snd_pcm_running(substream) ||
1610             snd_pcm_update_hw_ptr_interrupt(substream) < 0)
1611                 goto _end;
1612
1613         if (substream->timer_running)
1614                 snd_timer_interrupt(substream->timer, 1);
1615  _end:
1616         snd_pcm_stream_unlock_irqrestore(substream, flags);
1617         if (runtime->transfer_ack_end)
1618                 runtime->transfer_ack_end(substream);
1619         kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1620 }
1621
1622 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1623
1624 /*
1625  * Wait until avail_min data becomes available
1626  * Returns a negative error code if any error occurs during operation.
1627  * The available space is stored on availp.  When err = 0 and avail = 0
1628  * on the capture stream, it indicates the stream is in DRAINING state.
1629  */
1630 static int wait_for_avail_min(struct snd_pcm_substream *substream,
1631                               snd_pcm_uframes_t *availp)
1632 {
1633         struct snd_pcm_runtime *runtime = substream->runtime;
1634         int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1635         wait_queue_t wait;
1636         int err = 0;
1637         snd_pcm_uframes_t avail = 0;
1638         long tout;
1639
1640         init_waitqueue_entry(&wait, current);
1641         add_wait_queue(&runtime->sleep, &wait);
1642         for (;;) {
1643                 if (signal_pending(current)) {
1644                         err = -ERESTARTSYS;
1645                         break;
1646                 }
1647                 set_current_state(TASK_INTERRUPTIBLE);
1648                 snd_pcm_stream_unlock_irq(substream);
1649                 tout = schedule_timeout(msecs_to_jiffies(10000));
1650                 snd_pcm_stream_lock_irq(substream);
1651                 switch (runtime->status->state) {
1652                 case SNDRV_PCM_STATE_SUSPENDED:
1653                         err = -ESTRPIPE;
1654                         goto _endloop;
1655                 case SNDRV_PCM_STATE_XRUN:
1656                         err = -EPIPE;
1657                         goto _endloop;
1658                 case SNDRV_PCM_STATE_DRAINING:
1659                         if (is_playback)
1660                                 err = -EPIPE;
1661                         else
1662                                 avail = 0; /* indicate draining */
1663                         goto _endloop;
1664                 case SNDRV_PCM_STATE_OPEN:
1665                 case SNDRV_PCM_STATE_SETUP:
1666                 case SNDRV_PCM_STATE_DISCONNECTED:
1667                         err = -EBADFD;
1668                         goto _endloop;
1669                 }
1670                 if (!tout) {
1671                         snd_printd("%s write error (DMA or IRQ trouble?)\n",
1672                                    is_playback ? "playback" : "capture");
1673                         err = -EIO;
1674                         break;
1675                 }
1676                 if (is_playback)
1677                         avail = snd_pcm_playback_avail(runtime);
1678                 else
1679                         avail = snd_pcm_capture_avail(runtime);
1680                 if (avail >= runtime->control->avail_min)
1681                         break;
1682         }
1683  _endloop:
1684         remove_wait_queue(&runtime->sleep, &wait);
1685         *availp = avail;
1686         return err;
1687 }
1688
1689 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1690                                       unsigned int hwoff,
1691                                       unsigned long data, unsigned int off,
1692                                       snd_pcm_uframes_t frames)
1693 {
1694         struct snd_pcm_runtime *runtime = substream->runtime;
1695         int err;
1696         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1697         if (substream->ops->copy) {
1698                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1699                         return err;
1700         } else {
1701                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1702                 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1703                         return -EFAULT;
1704         }
1705         return 0;
1706 }
1707
1708 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1709                           unsigned long data, unsigned int off,
1710                           snd_pcm_uframes_t size);
1711
1712 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1713                                             unsigned long data,
1714                                             snd_pcm_uframes_t size,
1715                                             int nonblock,
1716                                             transfer_f transfer)
1717 {
1718         struct snd_pcm_runtime *runtime = substream->runtime;
1719         snd_pcm_uframes_t xfer = 0;
1720         snd_pcm_uframes_t offset = 0;
1721         int err = 0;
1722
1723         if (size == 0)
1724                 return 0;
1725
1726         snd_pcm_stream_lock_irq(substream);
1727         switch (runtime->status->state) {
1728         case SNDRV_PCM_STATE_PREPARED:
1729         case SNDRV_PCM_STATE_RUNNING:
1730         case SNDRV_PCM_STATE_PAUSED:
1731                 break;
1732         case SNDRV_PCM_STATE_XRUN:
1733                 err = -EPIPE;
1734                 goto _end_unlock;
1735         case SNDRV_PCM_STATE_SUSPENDED:
1736                 err = -ESTRPIPE;
1737                 goto _end_unlock;
1738         default:
1739                 err = -EBADFD;
1740                 goto _end_unlock;
1741         }
1742
1743         while (size > 0) {
1744                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1745                 snd_pcm_uframes_t avail;
1746                 snd_pcm_uframes_t cont;
1747                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1748                         snd_pcm_update_hw_ptr(substream);
1749                 avail = snd_pcm_playback_avail(runtime);
1750                 if (!avail) {
1751                         if (nonblock) {
1752                                 err = -EAGAIN;
1753                                 goto _end_unlock;
1754                         }
1755                         err = wait_for_avail_min(substream, &avail);
1756                         if (err < 0)
1757                                 goto _end_unlock;
1758                 }
1759                 frames = size > avail ? avail : size;
1760                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1761                 if (frames > cont)
1762                         frames = cont;
1763                 if (snd_BUG_ON(!frames)) {
1764                         snd_pcm_stream_unlock_irq(substream);
1765                         return -EINVAL;
1766                 }
1767                 appl_ptr = runtime->control->appl_ptr;
1768                 appl_ofs = appl_ptr % runtime->buffer_size;
1769                 snd_pcm_stream_unlock_irq(substream);
1770                 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
1771                         goto _end;
1772                 snd_pcm_stream_lock_irq(substream);
1773                 switch (runtime->status->state) {
1774                 case SNDRV_PCM_STATE_XRUN:
1775                         err = -EPIPE;
1776                         goto _end_unlock;
1777                 case SNDRV_PCM_STATE_SUSPENDED:
1778                         err = -ESTRPIPE;
1779                         goto _end_unlock;
1780                 default:
1781                         break;
1782                 }
1783                 appl_ptr += frames;
1784                 if (appl_ptr >= runtime->boundary)
1785                         appl_ptr -= runtime->boundary;
1786                 runtime->control->appl_ptr = appl_ptr;
1787                 if (substream->ops->ack)
1788                         substream->ops->ack(substream);
1789
1790                 offset += frames;
1791                 size -= frames;
1792                 xfer += frames;
1793                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1794                     snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1795                         err = snd_pcm_start(substream);
1796                         if (err < 0)
1797                                 goto _end_unlock;
1798                 }
1799         }
1800  _end_unlock:
1801         snd_pcm_stream_unlock_irq(substream);
1802  _end:
1803         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1804 }
1805
1806 /* sanity-check for read/write methods */
1807 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1808 {
1809         struct snd_pcm_runtime *runtime;
1810         if (PCM_RUNTIME_CHECK(substream))
1811                 return -ENXIO;
1812         runtime = substream->runtime;
1813         if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1814                 return -EINVAL;
1815         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1816                 return -EBADFD;
1817         return 0;
1818 }
1819
1820 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1821 {
1822         struct snd_pcm_runtime *runtime;
1823         int nonblock;
1824         int err;
1825
1826         err = pcm_sanity_check(substream);
1827         if (err < 0)
1828                 return err;
1829         runtime = substream->runtime;
1830         nonblock = !!(substream->f_flags & O_NONBLOCK);
1831
1832         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1833             runtime->channels > 1)
1834                 return -EINVAL;
1835         return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1836                                   snd_pcm_lib_write_transfer);
1837 }
1838
1839 EXPORT_SYMBOL(snd_pcm_lib_write);
1840
1841 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1842                                        unsigned int hwoff,
1843                                        unsigned long data, unsigned int off,
1844                                        snd_pcm_uframes_t frames)
1845 {
1846         struct snd_pcm_runtime *runtime = substream->runtime;
1847         int err;
1848         void __user **bufs = (void __user **)data;
1849         int channels = runtime->channels;
1850         int c;
1851         if (substream->ops->copy) {
1852                 if (snd_BUG_ON(!substream->ops->silence))
1853                         return -EINVAL;
1854                 for (c = 0; c < channels; ++c, ++bufs) {
1855                         if (*bufs == NULL) {
1856                                 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1857                                         return err;
1858                         } else {
1859                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1860                                 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1861                                         return err;
1862                         }
1863                 }
1864         } else {
1865                 /* default transfer behaviour */
1866                 size_t dma_csize = runtime->dma_bytes / channels;
1867                 for (c = 0; c < channels; ++c, ++bufs) {
1868                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1869                         if (*bufs == NULL) {
1870                                 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1871                         } else {
1872                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1873                                 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1874                                         return -EFAULT;
1875                         }
1876                 }
1877         }
1878         return 0;
1879 }
1880
1881 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1882                                      void __user **bufs,
1883                                      snd_pcm_uframes_t frames)
1884 {
1885         struct snd_pcm_runtime *runtime;
1886         int nonblock;
1887         int err;
1888
1889         err = pcm_sanity_check(substream);
1890         if (err < 0)
1891                 return err;
1892         runtime = substream->runtime;
1893         nonblock = !!(substream->f_flags & O_NONBLOCK);
1894
1895         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1896                 return -EINVAL;
1897         return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1898                                   nonblock, snd_pcm_lib_writev_transfer);
1899 }
1900
1901 EXPORT_SYMBOL(snd_pcm_lib_writev);
1902
1903 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
1904                                      unsigned int hwoff,
1905                                      unsigned long data, unsigned int off,
1906                                      snd_pcm_uframes_t frames)
1907 {
1908         struct snd_pcm_runtime *runtime = substream->runtime;
1909         int err;
1910         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1911         if (substream->ops->copy) {
1912                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1913                         return err;
1914         } else {
1915                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1916                 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
1917                         return -EFAULT;
1918         }
1919         return 0;
1920 }
1921
1922 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
1923                                            unsigned long data,
1924                                            snd_pcm_uframes_t size,
1925                                            int nonblock,
1926                                            transfer_f transfer)
1927 {
1928         struct snd_pcm_runtime *runtime = substream->runtime;
1929         snd_pcm_uframes_t xfer = 0;
1930         snd_pcm_uframes_t offset = 0;
1931         int err = 0;
1932
1933         if (size == 0)
1934                 return 0;
1935
1936         snd_pcm_stream_lock_irq(substream);
1937         switch (runtime->status->state) {
1938         case SNDRV_PCM_STATE_PREPARED:
1939                 if (size >= runtime->start_threshold) {
1940                         err = snd_pcm_start(substream);
1941                         if (err < 0)
1942                                 goto _end_unlock;
1943                 }
1944                 break;
1945         case SNDRV_PCM_STATE_DRAINING:
1946         case SNDRV_PCM_STATE_RUNNING:
1947         case SNDRV_PCM_STATE_PAUSED:
1948                 break;
1949         case SNDRV_PCM_STATE_XRUN:
1950                 err = -EPIPE;
1951                 goto _end_unlock;
1952         case SNDRV_PCM_STATE_SUSPENDED:
1953                 err = -ESTRPIPE;
1954                 goto _end_unlock;
1955         default:
1956                 err = -EBADFD;
1957                 goto _end_unlock;
1958         }
1959
1960         while (size > 0) {
1961                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1962                 snd_pcm_uframes_t avail;
1963                 snd_pcm_uframes_t cont;
1964                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1965                         snd_pcm_update_hw_ptr(substream);
1966                 avail = snd_pcm_capture_avail(runtime);
1967                 if (!avail) {
1968                         if (runtime->status->state ==
1969                             SNDRV_PCM_STATE_DRAINING) {
1970                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1971                                 goto _end_unlock;
1972                         }
1973                         if (nonblock) {
1974                                 err = -EAGAIN;
1975                                 goto _end_unlock;
1976                         }
1977                         err = wait_for_avail_min(substream, &avail);
1978                         if (err < 0)
1979                                 goto _end_unlock;
1980                         if (!avail)
1981                                 continue; /* draining */
1982                 }
1983                 frames = size > avail ? avail : size;
1984                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1985                 if (frames > cont)
1986                         frames = cont;
1987                 if (snd_BUG_ON(!frames)) {
1988                         snd_pcm_stream_unlock_irq(substream);
1989                         return -EINVAL;
1990                 }
1991                 appl_ptr = runtime->control->appl_ptr;
1992                 appl_ofs = appl_ptr % runtime->buffer_size;
1993                 snd_pcm_stream_unlock_irq(substream);
1994                 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
1995                         goto _end;
1996                 snd_pcm_stream_lock_irq(substream);
1997                 switch (runtime->status->state) {
1998                 case SNDRV_PCM_STATE_XRUN:
1999                         err = -EPIPE;
2000                         goto _end_unlock;
2001                 case SNDRV_PCM_STATE_SUSPENDED:
2002                         err = -ESTRPIPE;
2003                         goto _end_unlock;
2004                 default:
2005                         break;
2006                 }
2007                 appl_ptr += frames;
2008                 if (appl_ptr >= runtime->boundary)
2009                         appl_ptr -= runtime->boundary;
2010                 runtime->control->appl_ptr = appl_ptr;
2011                 if (substream->ops->ack)
2012                         substream->ops->ack(substream);
2013
2014                 offset += frames;
2015                 size -= frames;
2016                 xfer += frames;
2017         }
2018  _end_unlock:
2019         snd_pcm_stream_unlock_irq(substream);
2020  _end:
2021         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2022 }
2023
2024 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2025 {
2026         struct snd_pcm_runtime *runtime;
2027         int nonblock;
2028         int err;
2029
2030         err = pcm_sanity_check(substream);
2031         if (err < 0)
2032                 return err;
2033         runtime = substream->runtime;
2034         nonblock = !!(substream->f_flags & O_NONBLOCK);
2035         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2036                 return -EINVAL;
2037         return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2038 }
2039
2040 EXPORT_SYMBOL(snd_pcm_lib_read);
2041
2042 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2043                                       unsigned int hwoff,
2044                                       unsigned long data, unsigned int off,
2045                                       snd_pcm_uframes_t frames)
2046 {
2047         struct snd_pcm_runtime *runtime = substream->runtime;
2048         int err;
2049         void __user **bufs = (void __user **)data;
2050         int channels = runtime->channels;
2051         int c;
2052         if (substream->ops->copy) {
2053                 for (c = 0; c < channels; ++c, ++bufs) {
2054                         char __user *buf;
2055                         if (*bufs == NULL)
2056                                 continue;
2057                         buf = *bufs + samples_to_bytes(runtime, off);
2058                         if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2059                                 return err;
2060                 }
2061         } else {
2062                 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2063                 for (c = 0; c < channels; ++c, ++bufs) {
2064                         char *hwbuf;
2065                         char __user *buf;
2066                         if (*bufs == NULL)
2067                                 continue;
2068
2069                         hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2070                         buf = *bufs + samples_to_bytes(runtime, off);
2071                         if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2072                                 return -EFAULT;
2073                 }
2074         }
2075         return 0;
2076 }
2077
2078 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2079                                     void __user **bufs,
2080                                     snd_pcm_uframes_t frames)
2081 {
2082         struct snd_pcm_runtime *runtime;
2083         int nonblock;
2084         int err;
2085
2086         err = pcm_sanity_check(substream);
2087         if (err < 0)
2088                 return err;
2089         runtime = substream->runtime;
2090         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2091                 return -EBADFD;
2092
2093         nonblock = !!(substream->f_flags & O_NONBLOCK);
2094         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2095                 return -EINVAL;
2096         return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2097 }
2098
2099 EXPORT_SYMBOL(snd_pcm_lib_readv);