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 pcm_debug_name(struct snd_pcm_substream *substream,
 140                            char *name, size_t len)
 141 {
 142         snprintf(name, len, "pcmC%dD%d%c:%d",
 143                  substream->pcm->card->number,
 144                  substream->pcm->device,
 145                  substream->stream ? 'c' : 'p',
 146                  substream->number);
 147 }
 148
 149 static void xrun(struct snd_pcm_substream *substream)
 150 {
 151         struct snd_pcm_runtime *runtime = substream->runtime;
 152
 153         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 154                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 155         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 156         if (xrun_debug(substream, 1)) {
 157                 char name[16];
 158                 pcm_debug_name(substream, name, sizeof(name));
 159                 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
 160                 dump_stack_on_xrun(substream);
 161         }
 162 }
 163
 164 static snd_pcm_uframes_t
 165 snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
 166                           struct snd_pcm_runtime *runtime)
 167 {
 168         snd_pcm_uframes_t pos;
 169
 170         pos = substream->ops->pointer(substream);
 171         if (pos == SNDRV_PCM_POS_XRUN)
 172                 return pos; /* XRUN */
 173         if (pos >= runtime->buffer_size) {
 174                 if (printk_ratelimit()) {
 175                         char name[16];
 176                         pcm_debug_name(substream, name, sizeof(name));
 177                         snd_printd(KERN_ERR  "BUG: %s, pos = 0x%lx, "
 178                                    "buffer size = 0x%lx, period size = 0x%lx\n",
 179                                    name, pos, runtime->buffer_size,
 180                                    runtime->period_size);
 181                 }
 182                 pos = 0;
 183         }
 184         pos -= pos % runtime->min_align;
 185         return pos;
 186 }
 187
 188 static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
 189                                       struct snd_pcm_runtime *runtime)
 190 {
 191         snd_pcm_uframes_t avail;
 192
 193         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 194                 avail = snd_pcm_playback_avail(runtime);
 195         else
 196                 avail = snd_pcm_capture_avail(runtime);
 197         if (avail > runtime->avail_max)
 198                 runtime->avail_max = avail;
 199         if (avail >= runtime->stop_threshold) {
 200                 if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
 201                         snd_pcm_drain_done(substream);
 202                 else
 203                         xrun(substream);
 204                 return -EPIPE;
 205         }
 206         if (avail >= runtime->control->avail_min)
 207                 wake_up(&runtime->sleep);
 208         return 0;
 209 }
 210
 211 #define hw_ptr_error(substream, fmt, args...)                           \
 212         do {                                                            \
 213                 if (xrun_debug(substream, 1)) {                         \
 214                         if (printk_ratelimit()) {                       \
 215                                 snd_printd("PCM: " fmt, ##args);        \
 216                         }                                               \
 217                         dump_stack_on_xrun(substream);                  \
 218                 }                                                       \
 219         } while (0)
 220
 221 static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
 222 {
 223         struct snd_pcm_runtime *runtime = substream->runtime;
 224         snd_pcm_uframes_t pos;
 225         snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base;
 226         snd_pcm_sframes_t hdelta, delta;
 227         unsigned long jdelta;
 228
 229         old_hw_ptr = runtime->status->hw_ptr;
 230         pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 231         if (pos == SNDRV_PCM_POS_XRUN) {
 232                 xrun(substream);
 233                 return -EPIPE;
 234         }
 235         hw_base = runtime->hw_ptr_base;
 236         new_hw_ptr = hw_base + pos;
 237         hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
 238         delta = new_hw_ptr - hw_ptr_interrupt;
 239         if (hw_ptr_interrupt >= runtime->boundary) {
 240                 hw_ptr_interrupt -= runtime->boundary;
 241                 if (hw_base < runtime->boundary / 2)
 242                         /* hw_base was already lapped; recalc delta */
 243                         delta = new_hw_ptr - hw_ptr_interrupt;
 244         }
 245         if (delta < 0) {
 246                 delta += runtime->buffer_size;
 247                 if (delta < 0) {
 248                         hw_ptr_error(substream,
 249                                      "Unexpected hw_pointer value "
 250                                      "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
 251                                      substream->stream, (long)pos,
 252                                      (long)hw_ptr_interrupt);
 253                         /* rebase to interrupt position */
 254                         hw_base = new_hw_ptr = hw_ptr_interrupt;
 255                         /* align hw_base to buffer_size */
 256                         hw_base -= hw_base % runtime->buffer_size;
 257                         delta = 0;
 258                 } else {
 259                         hw_base += runtime->buffer_size;
 260                         if (hw_base >= runtime->boundary)
 261                                 hw_base = 0;
 262                         new_hw_ptr = hw_base + pos;
 263                 }
 264         }
 265
 266         /* Do jiffies check only in xrun_debug mode */
 267         if (!xrun_debug(substream, 4))
 268                 goto no_jiffies_check;
 269
 270         /* Skip the jiffies check for hardwares with BATCH flag.
 271          * Such hardware usually just increases the position at each IRQ,
 272          * thus it can't give any strange position.
 273          */
 274         if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
 275                 goto no_jiffies_check;
 276         hdelta = new_hw_ptr - old_hw_ptr;
 277         if (hdelta < runtime->delay)
 278                 goto no_jiffies_check;
 279         hdelta -= runtime->delay;
 280         jdelta = jiffies - runtime->hw_ptr_jiffies;
 281         if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
 282                 delta = jdelta /
 283                         (((runtime->period_size * HZ) / runtime->rate)
 284                                                                 + HZ/100);
 285                 hw_ptr_error(substream,
 286                              "hw_ptr skipping! [Q] "
 287                              "(pos=%ld, delta=%ld, period=%ld, "
 288                              "jdelta=%lu/%lu/%lu)\n",
 289                              (long)pos, (long)hdelta,
 290                              (long)runtime->period_size, jdelta,
 291                              ((hdelta * HZ) / runtime->rate), delta);
 292                 hw_ptr_interrupt = runtime->hw_ptr_interrupt +
 293                                    runtime->period_size * delta;
 294                 if (hw_ptr_interrupt >= runtime->boundary)
 295                         hw_ptr_interrupt -= runtime->boundary;
 296                 /* rebase to interrupt position */
 297                 hw_base = new_hw_ptr = hw_ptr_interrupt;
 298                 /* align hw_base to buffer_size */
 299                 hw_base -= hw_base % runtime->buffer_size;
 300                 delta = 0;
 301         }
 302  no_jiffies_check:
 303         if (delta > runtime->period_size + runtime->period_size / 2) {
 304                 hw_ptr_error(substream,
 305                              "Lost interrupts? "
 306                              "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
 307                              substream->stream, (long)delta,
 308                              (long)hw_ptr_interrupt);
 309                 /* rebase hw_ptr_interrupt */
 310                 hw_ptr_interrupt =
 311                         new_hw_ptr - new_hw_ptr % runtime->period_size;
 312         }
 313         runtime->hw_ptr_interrupt = hw_ptr_interrupt;
 314
 315         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 316             runtime->silence_size > 0)
 317                 snd_pcm_playback_silence(substream, new_hw_ptr);
 318
 319         if (runtime->status->hw_ptr == new_hw_ptr)
 320                 return 0;
 321
 322         runtime->hw_ptr_base = hw_base;
 323         runtime->status->hw_ptr = new_hw_ptr;
 324         runtime->hw_ptr_jiffies = jiffies;
 325         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 326                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 327
 328         return snd_pcm_update_hw_ptr_post(substream, runtime);
 329 }
 330
 331 /* CAUTION: call it with irq disabled */
 332 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 333 {
 334         struct snd_pcm_runtime *runtime = substream->runtime;
 335         snd_pcm_uframes_t pos;
 336         snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
 337         snd_pcm_sframes_t delta;
 338         unsigned long jdelta;
 339
 340         old_hw_ptr = runtime->status->hw_ptr;
 341         pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
 342         if (pos == SNDRV_PCM_POS_XRUN) {
 343                 xrun(substream);
 344                 return -EPIPE;
 345         }
 346         hw_base = runtime->hw_ptr_base;
 347         new_hw_ptr = hw_base + pos;
 348
 349         delta = new_hw_ptr - old_hw_ptr;
 350         jdelta = jiffies - runtime->hw_ptr_jiffies;
 351         if (delta < 0) {
 352                 delta += runtime->buffer_size;
 353                 if (delta < 0) {
 354                         hw_ptr_error(substream,
 355                                      "Unexpected hw_pointer value [2] "
 356                                      "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
 357                                      substream->stream, (long)pos,
 358                                      (long)old_hw_ptr, jdelta);
 359                         return 0;
 360                 }
 361                 hw_base += runtime->buffer_size;
 362                 if (hw_base >= runtime->boundary)
 363                         hw_base = 0;
 364                 new_hw_ptr = hw_base + pos;
 365         }
 366         /* Do jiffies check only in xrun_debug mode */
 367         if (!xrun_debug(substream, 4))
 368                 goto no_jiffies_check;
 369         if (delta < runtime->delay)
 370                 goto no_jiffies_check;
 371         delta -= runtime->delay;
 372         if (((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
 373                 hw_ptr_error(substream,
 374                              "hw_ptr skipping! "
 375                              "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
 376                              (long)pos, (long)delta,
 377                              (long)runtime->period_size, jdelta,
 378                              ((delta * HZ) / runtime->rate));
 379                 return 0;
 380         }
 381  no_jiffies_check:
 382         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 383             runtime->silence_size > 0)
 384                 snd_pcm_playback_silence(substream, new_hw_ptr);
 385
 386         if (runtime->status->hw_ptr == new_hw_ptr)
 387                 return 0;
 388
 389         runtime->hw_ptr_base = hw_base;
 390         runtime->status->hw_ptr = new_hw_ptr;
 391         runtime->hw_ptr_jiffies = jiffies;
 392         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 393                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 394
 395         return snd_pcm_update_hw_ptr_post(substream, runtime);
 396 }
 397
 398 /**
 399  * snd_pcm_set_ops - set the PCM operators
 400  * @pcm: the pcm instance
 401  * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 402  * @ops: the operator table
 403  *
 404  * Sets the given PCM operators to the pcm instance.
 405  */
 406 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
 407 {
 408         struct snd_pcm_str *stream = &pcm->streams[direction];
 409         struct snd_pcm_substream *substream;
 410
 411         for (substream = stream->substream; substream != NULL; substream = substream->next)
 412                 substream->ops = ops;
 413 }
 414
 415 EXPORT_SYMBOL(snd_pcm_set_ops);
 416
 417 /**
 418  * snd_pcm_sync - set the PCM sync id
 419  * @substream: the pcm substream
 420  *
 421  * Sets the PCM sync identifier for the card.
 422  */
 423 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
 424 {
 425         struct snd_pcm_runtime *runtime = substream->runtime;
 426
 427         runtime->sync.id32[0] = substream->pcm->card->number;
 428         runtime->sync.id32[1] = -1;
 429         runtime->sync.id32[2] = -1;
 430         runtime->sync.id32[3] = -1;
 431 }
 432
 433 EXPORT_SYMBOL(snd_pcm_set_sync);
 434
 435 /*
 436  *  Standard ioctl routine
 437  */
 438
 439 static inline unsigned int div32(unsigned int a, unsigned int b,
 440                                  unsigned int *r)
 441 {
 442         if (b == 0) {
 443                 *r = 0;
 444                 return UINT_MAX;
 445         }
 446         *r = a % b;
 447         return a / b;
 448 }
 449
 450 static inline unsigned int div_down(unsigned int a, unsigned int b)
 451 {
 452         if (b == 0)
 453                 return UINT_MAX;
 454         return a / b;
 455 }
 456
 457 static inline unsigned int div_up(unsigned int a, unsigned int b)
 458 {
 459         unsigned int r;
 460         unsigned int q;
 461         if (b == 0)
 462                 return UINT_MAX;
 463         q = div32(a, b, &r);
 464         if (r)
 465                 ++q;
 466         return q;
 467 }
 468
 469 static inline unsigned int mul(unsigned int a, unsigned int b)
 470 {
 471         if (a == 0)
 472                 return 0;
 473         if (div_down(UINT_MAX, a) < b)
 474                 return UINT_MAX;
 475         return a * b;
 476 }
 477
 478 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
 479                                     unsigned int c, unsigned int *r)
 480 {
 481         u_int64_t n = (u_int64_t) a * b;
 482         if (c == 0) {
 483                 snd_BUG_ON(!n);
 484                 *r = 0;
 485                 return UINT_MAX;
 486         }
 487         div64_32(&n, c, r);
 488         if (n >= UINT_MAX) {
 489                 *r = 0;
 490                 return UINT_MAX;
 491         }
 492         return n;
 493 }
 494
 495 /**
 496  * snd_interval_refine - refine the interval value of configurator
 497  * @i: the interval value to refine
 498  * @v: the interval value to refer to
 499  *
 500  * Refines the interval value with the reference value.
 501  * The interval is changed to the range satisfying both intervals.
 502  * The interval status (min, max, integer, etc.) are evaluated.
 503  *
 504  * Returns non-zero if the value is changed, zero if not changed.
 505  */
 506 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
 507 {
 508         int changed = 0;
 509         if (snd_BUG_ON(snd_interval_empty(i)))
 510                 return -EINVAL;
 511         if (i->min < v->min) {
 512                 i->min = v->min;
 513                 i->openmin = v->openmin;
 514                 changed = 1;
 515         } else if (i->min == v->min && !i->openmin && v->openmin) {
 516                 i->openmin = 1;
 517                 changed = 1;
 518         }
 519         if (i->max > v->max) {
 520                 i->max = v->max;
 521                 i->openmax = v->openmax;
 522                 changed = 1;
 523         } else if (i->max == v->max && !i->openmax && v->openmax) {
 524                 i->openmax = 1;
 525                 changed = 1;
 526         }
 527         if (!i->integer && v->integer) {
 528                 i->integer = 1;
 529                 changed = 1;
 530         }
 531         if (i->integer) {
 532                 if (i->openmin) {
 533                         i->min++;
 534                         i->openmin = 0;
 535                 }
 536                 if (i->openmax) {
 537                         i->max--;
 538                         i->openmax = 0;
 539                 }
 540         } else if (!i->openmin && !i->openmax && i->min == i->max)
 541                 i->integer = 1;
 542         if (snd_interval_checkempty(i)) {
 543                 snd_interval_none(i);
 544                 return -EINVAL;
 545         }
 546         return changed;
 547 }
 548
 549 EXPORT_SYMBOL(snd_interval_refine);
 550
 551 static int snd_interval_refine_first(struct snd_interval *i)
 552 {
 553         if (snd_BUG_ON(snd_interval_empty(i)))
 554                 return -EINVAL;
 555         if (snd_interval_single(i))
 556                 return 0;
 557         i->max = i->min;
 558         i->openmax = i->openmin;
 559         if (i->openmax)
 560                 i->max++;
 561         return 1;
 562 }
 563
 564 static int snd_interval_refine_last(struct snd_interval *i)
 565 {
 566         if (snd_BUG_ON(snd_interval_empty(i)))
 567                 return -EINVAL;
 568         if (snd_interval_single(i))
 569                 return 0;
 570         i->min = i->max;
 571         i->openmin = i->openmax;
 572         if (i->openmin)
 573                 i->min--;
 574         return 1;
 575 }
 576
 577 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 578 {
 579         if (a->empty || b->empty) {
 580                 snd_interval_none(c);
 581                 return;
 582         }
 583         c->empty = 0;
 584         c->min = mul(a->min, b->min);
 585         c->openmin = (a->openmin || b->openmin);
 586         c->max = mul(a->max,  b->max);
 587         c->openmax = (a->openmax || b->openmax);
 588         c->integer = (a->integer && b->integer);
 589 }
 590
 591 /**
 592  * snd_interval_div - refine the interval value with division
 593  * @a: dividend
 594  * @b: divisor
 595  * @c: quotient
 596  *
 597  * c = a / b
 598  *
 599  * Returns non-zero if the value is changed, zero if not changed.
 600  */
 601 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 602 {
 603         unsigned int r;
 604         if (a->empty || b->empty) {
 605                 snd_interval_none(c);
 606                 return;
 607         }
 608         c->empty = 0;
 609         c->min = div32(a->min, b->max, &r);
 610         c->openmin = (r || a->openmin || b->openmax);
 611         if (b->min > 0) {
 612                 c->max = div32(a->max, b->min, &r);
 613                 if (r) {
 614                         c->max++;
 615                         c->openmax = 1;
 616                 } else
 617                         c->openmax = (a->openmax || b->openmin);
 618         } else {
 619                 c->max = UINT_MAX;
 620                 c->openmax = 0;
 621         }
 622         c->integer = 0;
 623 }
 624
 625 /**
 626  * snd_interval_muldivk - refine the interval value
 627  * @a: dividend 1
 628  * @b: dividend 2
 629  * @k: divisor (as integer)
 630  * @c: result
 631   *
 632  * c = a * b / k
 633  *
 634  * Returns non-zero if the value is changed, zero if not changed.
 635  */
 636 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 637                       unsigned int k, struct snd_interval *c)
 638 {
 639         unsigned int r;
 640         if (a->empty || b->empty) {
 641                 snd_interval_none(c);
 642                 return;
 643         }
 644         c->empty = 0;
 645         c->min = muldiv32(a->min, b->min, k, &r);
 646         c->openmin = (r || a->openmin || b->openmin);
 647         c->max = muldiv32(a->max, b->max, k, &r);
 648         if (r) {
 649                 c->max++;
 650                 c->openmax = 1;
 651         } else
 652                 c->openmax = (a->openmax || b->openmax);
 653         c->integer = 0;
 654 }
 655
 656 /**
 657  * snd_interval_mulkdiv - refine the interval value
 658  * @a: dividend 1
 659  * @k: dividend 2 (as integer)
 660  * @b: divisor
 661  * @c: result
 662  *
 663  * c = a * k / b
 664  *
 665  * Returns non-zero if the value is changed, zero if not changed.
 666  */
 667 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 668                       const struct snd_interval *b, struct snd_interval *c)
 669 {
 670         unsigned int r;
 671         if (a->empty || b->empty) {
 672                 snd_interval_none(c);
 673                 return;
 674         }
 675         c->empty = 0;
 676         c->min = muldiv32(a->min, k, b->max, &r);
 677         c->openmin = (r || a->openmin || b->openmax);
 678         if (b->min > 0) {
 679                 c->max = muldiv32(a->max, k, b->min, &r);
 680                 if (r) {
 681                         c->max++;
 682                         c->openmax = 1;
 683                 } else
 684                         c->openmax = (a->openmax || b->openmin);
 685         } else {
 686                 c->max = UINT_MAX;
 687                 c->openmax = 0;
 688         }
 689         c->integer = 0;
 690 }
 691
 692 /* ---- */
 693
 694
 695 /**
 696  * snd_interval_ratnum - refine the interval value
 697  * @i: interval to refine
 698  * @rats_count: number of ratnum_t
 699  * @rats: ratnum_t array
 700  * @nump: pointer to store the resultant numerator
 701  * @denp: pointer to store the resultant denominator
 702  *
 703  * Returns non-zero if the value is changed, zero if not changed.
 704  */
 705 int snd_interval_ratnum(struct snd_interval *i,
 706                         unsigned int rats_count, struct snd_ratnum *rats,
 707                         unsigned int *nump, unsigned int *denp)
 708 {
 709         unsigned int best_num, best_diff, best_den;
 710         unsigned int k;
 711         struct snd_interval t;
 712         int err;
 713
 714         best_num = best_den = best_diff = 0;
 715         for (k = 0; k < rats_count; ++k) {
 716                 unsigned int num = rats[k].num;
 717                 unsigned int den;
 718                 unsigned int q = i->min;
 719                 int diff;
 720                 if (q == 0)
 721                         q = 1;
 722                 den = div_down(num, q);
 723                 if (den < rats[k].den_min)
 724                         continue;
 725                 if (den > rats[k].den_max)
 726                         den = rats[k].den_max;
 727                 else {
 728                         unsigned int r;
 729                         r = (den - rats[k].den_min) % rats[k].den_step;
 730                         if (r != 0)
 731                                 den -= r;
 732                 }
 733                 diff = num - q * den;
 734                 if (best_num == 0 ||
 735                     diff * best_den < best_diff * den) {
 736                         best_diff = diff;
 737                         best_den = den;
 738                         best_num = num;
 739                 }
 740         }
 741         if (best_den == 0) {
 742                 i->empty = 1;
 743                 return -EINVAL;
 744         }
 745         t.min = div_down(best_num, best_den);
 746         t.openmin = !!(best_num % best_den);
 747
 748         best_num = best_den = best_diff = 0;
 749         for (k = 0; k < rats_count; ++k) {
 750                 unsigned int num = rats[k].num;
 751                 unsigned int den;
 752                 unsigned int q = i->max;
 753                 int diff;
 754                 if (q == 0) {
 755                         i->empty = 1;
 756                         return -EINVAL;
 757                 }
 758                 den = div_up(num, q);
 759                 if (den > rats[k].den_max)
 760                         continue;
 761                 if (den < rats[k].den_min)
 762                         den = rats[k].den_min;
 763                 else {
 764                         unsigned int r;
 765                         r = (den - rats[k].den_min) % rats[k].den_step;
 766                         if (r != 0)
 767                                 den += rats[k].den_step - r;
 768                 }
 769                 diff = q * den - num;
 770                 if (best_num == 0 ||
 771                     diff * best_den < best_diff * den) {
 772                         best_diff = diff;
 773                         best_den = den;
 774                         best_num = num;
 775                 }
 776         }
 777         if (best_den == 0) {
 778                 i->empty = 1;
 779                 return -EINVAL;
 780         }
 781         t.max = div_up(best_num, best_den);
 782         t.openmax = !!(best_num % best_den);
 783         t.integer = 0;
 784         err = snd_interval_refine(i, &t);
 785         if (err < 0)
 786                 return err;
 787
 788         if (snd_interval_single(i)) {
 789                 if (nump)
 790                         *nump = best_num;
 791                 if (denp)
 792                         *denp = best_den;
 793         }
 794         return err;
 795 }
 796
 797 EXPORT_SYMBOL(snd_interval_ratnum);
 798
 799 /**
 800  * snd_interval_ratden - refine the interval value
 801  * @i: interval to refine
 802  * @rats_count: number of struct ratden
 803  * @rats: struct ratden array
 804  * @nump: pointer to store the resultant numerator
 805  * @denp: pointer to store the resultant denominator
 806  *
 807  * Returns non-zero if the value is changed, zero if not changed.
 808  */
 809 static int snd_interval_ratden(struct snd_interval *i,
 810                                unsigned int rats_count, struct snd_ratden *rats,
 811                                unsigned int *nump, unsigned int *denp)
 812 {
 813         unsigned int best_num, best_diff, best_den;
 814         unsigned int k;
 815         struct snd_interval t;
 816         int err;
 817
 818         best_num = best_den = best_diff = 0;
 819         for (k = 0; k < rats_count; ++k) {
 820                 unsigned int num;
 821                 unsigned int den = rats[k].den;
 822                 unsigned int q = i->min;
 823                 int diff;
 824                 num = mul(q, den);
 825                 if (num > rats[k].num_max)
 826                         continue;
 827                 if (num < rats[k].num_min)
 828                         num = rats[k].num_max;
 829                 else {
 830                         unsigned int r;
 831                         r = (num - rats[k].num_min) % rats[k].num_step;
 832                         if (r != 0)
 833                                 num += rats[k].num_step - r;
 834                 }
 835                 diff = num - q * den;
 836                 if (best_num == 0 ||
 837                     diff * best_den < best_diff * den) {
 838                         best_diff = diff;
 839                         best_den = den;
 840                         best_num = num;
 841                 }
 842         }
 843         if (best_den == 0) {
 844                 i->empty = 1;
 845                 return -EINVAL;
 846         }
 847         t.min = div_down(best_num, best_den);
 848         t.openmin = !!(best_num % best_den);
 849
 850         best_num = best_den = best_diff = 0;
 851         for (k = 0; k < rats_count; ++k) {
 852                 unsigned int num;
 853                 unsigned int den = rats[k].den;
 854                 unsigned int q = i->max;
 855                 int diff;
 856                 num = mul(q, den);
 857                 if (num < rats[k].num_min)
 858                         continue;
 859                 if (num > rats[k].num_max)
 860                         num = rats[k].num_max;
 861                 else {
 862                         unsigned int r;
 863                         r = (num - rats[k].num_min) % rats[k].num_step;
 864                         if (r != 0)
 865                                 num -= r;
 866                 }
 867                 diff = q * den - num;
 868                 if (best_num == 0 ||
 869                     diff * best_den < best_diff * den) {
 870                         best_diff = diff;
 871                         best_den = den;
 872                         best_num = num;
 873                 }
 874         }
 875         if (best_den == 0) {
 876                 i->empty = 1;
 877                 return -EINVAL;
 878         }
 879         t.max = div_up(best_num, best_den);
 880         t.openmax = !!(best_num % best_den);
 881         t.integer = 0;
 882         err = snd_interval_refine(i, &t);
 883         if (err < 0)
 884                 return err;
 885
 886         if (snd_interval_single(i)) {
 887                 if (nump)
 888                         *nump = best_num;
 889                 if (denp)
 890                         *denp = best_den;
 891         }
 892         return err;
 893 }
 894
 895 /**
 896  * snd_interval_list - refine the interval value from the list
 897  * @i: the interval value to refine
 898  * @count: the number of elements in the list
 899  * @list: the value list
 900  * @mask: the bit-mask to evaluate
 901  *
 902  * Refines the interval value from the list.
 903  * When mask is non-zero, only the elements corresponding to bit 1 are
 904  * evaluated.
 905  *
 906  * Returns non-zero if the value is changed, zero if not changed.
 907  */
 908 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
 909 {
 910         unsigned int k;
 911         int changed = 0;
 912
 913         if (!count) {
 914                 i->empty = 1;
 915                 return -EINVAL;
 916         }
 917         for (k = 0; k < count; k++) {
 918                 if (mask && !(mask & (1 << k)))
 919                         continue;
 920                 if (i->min == list[k] && !i->openmin)
 921                         goto _l1;
 922                 if (i->min < list[k]) {
 923                         i->min = list[k];
 924                         i->openmin = 0;
 925                         changed = 1;
 926                         goto _l1;
 927                 }
 928         }
 929         i->empty = 1;
 930         return -EINVAL;
 931  _l1:
 932         for (k = count; k-- > 0;) {
 933                 if (mask && !(mask & (1 << k)))
 934                         continue;
 935                 if (i->max == list[k] && !i->openmax)
 936                         goto _l2;
 937                 if (i->max > list[k]) {
 938                         i->max = list[k];
 939                         i->openmax = 0;
 940                         changed = 1;
 941                         goto _l2;
 942                 }
 943         }
 944         i->empty = 1;
 945         return -EINVAL;
 946  _l2:
 947         if (snd_interval_checkempty(i)) {
 948                 i->empty = 1;
 949                 return -EINVAL;
 950         }
 951         return changed;
 952 }
 953
 954 EXPORT_SYMBOL(snd_interval_list);
 955
 956 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
 957 {
 958         unsigned int n;
 959         int changed = 0;
 960         n = (i->min - min) % step;
 961         if (n != 0 || i->openmin) {
 962                 i->min += step - n;
 963                 changed = 1;
 964         }
 965         n = (i->max - min) % step;
 966         if (n != 0 || i->openmax) {
 967                 i->max -= n;
 968                 changed = 1;
 969         }
 970         if (snd_interval_checkempty(i)) {
 971                 i->empty = 1;
 972                 return -EINVAL;
 973         }
 974         return changed;
 975 }
 976
 977 /* Info constraints helpers */
 978
 979 /**
 980  * snd_pcm_hw_rule_add - add the hw-constraint rule
 981  * @runtime: the pcm runtime instance
 982  * @cond: condition bits
 983  * @var: the variable to evaluate
 984  * @func: the evaluation function
 985  * @private: the private data pointer passed to function
 986  * @dep: the dependent variables
 987  *
 988  * Returns zero if successful, or a negative error code on failure.
 989  */
 990 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
 991                         int var,
 992                         snd_pcm_hw_rule_func_t func, void *private,
 993                         int dep, ...)
 994 {
 995         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
 996         struct snd_pcm_hw_rule *c;
 997         unsigned int k;
 998         va_list args;
 999         va_start(args, dep);
1000         if (constrs->rules_num >= constrs->rules_all) {
1001                 struct snd_pcm_hw_rule *new;
1002                 unsigned int new_rules = constrs->rules_all + 16;
1003                 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1004                 if (!new)
1005                         return -ENOMEM;
1006                 if (constrs->rules) {
1007                         memcpy(new, constrs->rules,
1008                                constrs->rules_num * sizeof(*c));
1009                         kfree(constrs->rules);
1010                 }
1011                 constrs->rules = new;
1012                 constrs->rules_all = new_rules;
1013         }
1014         c = &constrs->rules[constrs->rules_num];
1015         c->cond = cond;
1016         c->func = func;
1017         c->var = var;
1018         c->private = private;
1019         k = 0;
1020         while (1) {
1021                 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
1022                         return -EINVAL;
1023                 c->deps[k++] = dep;
1024                 if (dep < 0)
1025                         break;
1026                 dep = va_arg(args, int);
1027         }
1028         constrs->rules_num++;
1029         va_end(args);
1030         return 0;
1031 }
1032
1033 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1034
1035 /**
1036  * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1037  * @runtime: PCM runtime instance
1038  * @var: hw_params variable to apply the mask
1039  * @mask: the bitmap mask
1040  *
1041  * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1042  */
1043 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1044                                u_int32_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 &= mask;
1049         memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1050         if (*maskp->bits == 0)
1051                 return -EINVAL;
1052         return 0;
1053 }
1054
1055 /**
1056  * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1057  * @runtime: PCM runtime instance
1058  * @var: hw_params variable to apply the mask
1059  * @mask: the 64bit bitmap mask
1060  *
1061  * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1062  */
1063 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1064                                  u_int64_t mask)
1065 {
1066         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1067         struct snd_mask *maskp = constrs_mask(constrs, var);
1068         maskp->bits[0] &= (u_int32_t)mask;
1069         maskp->bits[1] &= (u_int32_t)(mask >> 32);
1070         memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1071         if (! maskp->bits[0] && ! maskp->bits[1])
1072                 return -EINVAL;
1073         return 0;
1074 }
1075
1076 /**
1077  * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1078  * @runtime: PCM runtime instance
1079  * @var: hw_params variable to apply the integer constraint
1080  *
1081  * Apply the constraint of integer to an interval parameter.
1082  */
1083 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1084 {
1085         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1086         return snd_interval_setinteger(constrs_interval(constrs, var));
1087 }
1088
1089 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1090
1091 /**
1092  * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1093  * @runtime: PCM runtime instance
1094  * @var: hw_params variable to apply the range
1095  * @min: the minimal value
1096  * @max: the maximal value
1097  *
1098  * Apply the min/max range constraint to an interval parameter.
1099  */
1100 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1101                                  unsigned int min, unsigned int max)
1102 {
1103         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1104         struct snd_interval t;
1105         t.min = min;
1106         t.max = max;
1107         t.openmin = t.openmax = 0;
1108         t.integer = 0;
1109         return snd_interval_refine(constrs_interval(constrs, var), &t);
1110 }
1111
1112 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1113
1114 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1115                                 struct snd_pcm_hw_rule *rule)
1116 {
1117         struct snd_pcm_hw_constraint_list *list = rule->private;
1118         return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1119 }
1120
1121
1122 /**
1123  * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1124  * @runtime: PCM runtime instance
1125  * @cond: condition bits
1126  * @var: hw_params variable to apply the list constraint
1127  * @l: list
1128  *
1129  * Apply the list of constraints to an interval parameter.
1130  */
1131 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1132                                unsigned int cond,
1133                                snd_pcm_hw_param_t var,
1134                                struct snd_pcm_hw_constraint_list *l)
1135 {
1136         return snd_pcm_hw_rule_add(runtime, cond, var,
1137                                    snd_pcm_hw_rule_list, l,
1138                                    var, -1);
1139 }
1140
1141 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1142
1143 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1144                                    struct snd_pcm_hw_rule *rule)
1145 {
1146         struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1147         unsigned int num = 0, den = 0;
1148         int err;
1149         err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1150                                   r->nrats, r->rats, &num, &den);
1151         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1152                 params->rate_num = num;
1153                 params->rate_den = den;
1154         }
1155         return err;
1156 }
1157
1158 /**
1159  * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1160  * @runtime: PCM runtime instance
1161  * @cond: condition bits
1162  * @var: hw_params variable to apply the ratnums constraint
1163  * @r: struct snd_ratnums constriants
1164  */
1165 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1166                                   unsigned int cond,
1167                                   snd_pcm_hw_param_t var,
1168                                   struct snd_pcm_hw_constraint_ratnums *r)
1169 {
1170         return snd_pcm_hw_rule_add(runtime, cond, var,
1171                                    snd_pcm_hw_rule_ratnums, r,
1172                                    var, -1);
1173 }
1174
1175 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1176
1177 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1178                                    struct snd_pcm_hw_rule *rule)
1179 {
1180         struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1181         unsigned int num = 0, den = 0;
1182         int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1183                                   r->nrats, r->rats, &num, &den);
1184         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1185                 params->rate_num = num;
1186                 params->rate_den = den;
1187         }
1188         return err;
1189 }
1190
1191 /**
1192  * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1193  * @runtime: PCM runtime instance
1194  * @cond: condition bits
1195  * @var: hw_params variable to apply the ratdens constraint
1196  * @r: struct snd_ratdens constriants
1197  */
1198 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1199                                   unsigned int cond,
1200                                   snd_pcm_hw_param_t var,
1201                                   struct snd_pcm_hw_constraint_ratdens *r)
1202 {
1203         return snd_pcm_hw_rule_add(runtime, cond, var,
1204                                    snd_pcm_hw_rule_ratdens, r,
1205                                    var, -1);
1206 }
1207
1208 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1209
1210 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1211                                   struct snd_pcm_hw_rule *rule)
1212 {
1213         unsigned int l = (unsigned long) rule->private;
1214         int width = l & 0xffff;
1215         unsigned int msbits = l >> 16;
1216         struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1217         if (snd_interval_single(i) && snd_interval_value(i) == width)
1218                 params->msbits = msbits;
1219         return 0;
1220 }
1221
1222 /**
1223  * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1224  * @runtime: PCM runtime instance
1225  * @cond: condition bits
1226  * @width: sample bits width
1227  * @msbits: msbits width
1228  */
1229 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1230                                  unsigned int cond,
1231                                  unsigned int width,
1232                                  unsigned int msbits)
1233 {
1234         unsigned long l = (msbits << 16) | width;
1235         return snd_pcm_hw_rule_add(runtime, cond, -1,
1236                                     snd_pcm_hw_rule_msbits,
1237                                     (void*) l,
1238                                     SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1239 }
1240
1241 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1242
1243 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1244                                 struct snd_pcm_hw_rule *rule)
1245 {
1246         unsigned long step = (unsigned long) rule->private;
1247         return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1248 }
1249
1250 /**
1251  * snd_pcm_hw_constraint_step - add a hw constraint step rule
1252  * @runtime: PCM runtime instance
1253  * @cond: condition bits
1254  * @var: hw_params variable to apply the step constraint
1255  * @step: step size
1256  */
1257 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1258                                unsigned int cond,
1259                                snd_pcm_hw_param_t var,
1260                                unsigned long step)
1261 {
1262         return snd_pcm_hw_rule_add(runtime, cond, var,
1263                                    snd_pcm_hw_rule_step, (void *) step,
1264                                    var, -1);
1265 }
1266
1267 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1268
1269 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1270 {
1271         static unsigned int pow2_sizes[] = {
1272                 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1273                 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1274                 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1275                 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1276         };
1277         return snd_interval_list(hw_param_interval(params, rule->var),
1278                                  ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1279 }
1280
1281 /**
1282  * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1283  * @runtime: PCM runtime instance
1284  * @cond: condition bits
1285  * @var: hw_params variable to apply the power-of-2 constraint
1286  */
1287 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1288                                unsigned int cond,
1289                                snd_pcm_hw_param_t var)
1290 {
1291         return snd_pcm_hw_rule_add(runtime, cond, var,
1292                                    snd_pcm_hw_rule_pow2, NULL,
1293                                    var, -1);
1294 }
1295
1296 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1297
1298 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1299                                   snd_pcm_hw_param_t var)
1300 {
1301         if (hw_is_mask(var)) {
1302                 snd_mask_any(hw_param_mask(params, var));
1303                 params->cmask |= 1 << var;
1304                 params->rmask |= 1 << var;
1305                 return;
1306         }
1307         if (hw_is_interval(var)) {
1308                 snd_interval_any(hw_param_interval(params, var));
1309                 params->cmask |= 1 << var;
1310                 params->rmask |= 1 << var;
1311                 return;
1312         }
1313         snd_BUG();
1314 }
1315
1316 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1317 {
1318         unsigned int k;
1319         memset(params, 0, sizeof(*params));
1320         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1321                 _snd_pcm_hw_param_any(params, k);
1322         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1323                 _snd_pcm_hw_param_any(params, k);
1324         params->info = ~0U;
1325 }
1326
1327 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1328
1329 /**
1330  * snd_pcm_hw_param_value - return @params field @var value
1331  * @params: the hw_params instance
1332  * @var: parameter to retrieve
1333  * @dir: pointer to the direction (-1,0,1) or %NULL
1334  *
1335  * Return the value for field @var if it's fixed in configuration space
1336  * defined by @params. Return -%EINVAL otherwise.
1337  */
1338 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1339                            snd_pcm_hw_param_t var, int *dir)
1340 {
1341         if (hw_is_mask(var)) {
1342                 const struct snd_mask *mask = hw_param_mask_c(params, var);
1343                 if (!snd_mask_single(mask))
1344                         return -EINVAL;
1345                 if (dir)
1346                         *dir = 0;
1347                 return snd_mask_value(mask);
1348         }
1349         if (hw_is_interval(var)) {
1350                 const struct snd_interval *i = hw_param_interval_c(params, var);
1351                 if (!snd_interval_single(i))
1352                         return -EINVAL;
1353                 if (dir)
1354                         *dir = i->openmin;
1355                 return snd_interval_value(i);
1356         }
1357         return -EINVAL;
1358 }
1359
1360 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1361
1362 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1363                                 snd_pcm_hw_param_t var)
1364 {
1365         if (hw_is_mask(var)) {
1366                 snd_mask_none(hw_param_mask(params, var));
1367                 params->cmask |= 1 << var;
1368                 params->rmask |= 1 << var;
1369         } else if (hw_is_interval(var)) {
1370                 snd_interval_none(hw_param_interval(params, var));
1371                 params->cmask |= 1 << var;
1372                 params->rmask |= 1 << var;
1373         } else {
1374                 snd_BUG();
1375         }
1376 }
1377
1378 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1379
1380 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1381                                    snd_pcm_hw_param_t var)
1382 {
1383         int changed;
1384         if (hw_is_mask(var))
1385                 changed = snd_mask_refine_first(hw_param_mask(params, var));
1386         else if (hw_is_interval(var))
1387                 changed = snd_interval_refine_first(hw_param_interval(params, var));
1388         else
1389                 return -EINVAL;
1390         if (changed) {
1391                 params->cmask |= 1 << var;
1392                 params->rmask |= 1 << var;
1393         }
1394         return changed;
1395 }
1396
1397
1398 /**
1399  * snd_pcm_hw_param_first - refine config space and return minimum value
1400  * @pcm: PCM instance
1401  * @params: the hw_params instance
1402  * @var: parameter to retrieve
1403  * @dir: pointer to the direction (-1,0,1) or %NULL
1404  *
1405  * Inside configuration space defined by @params remove from @var all
1406  * values > minimum. Reduce configuration space accordingly.
1407  * Return the minimum.
1408  */
1409 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1410                            struct snd_pcm_hw_params *params,
1411                            snd_pcm_hw_param_t var, int *dir)
1412 {
1413         int changed = _snd_pcm_hw_param_first(params, var);
1414         if (changed < 0)
1415                 return changed;
1416         if (params->rmask) {
1417                 int err = snd_pcm_hw_refine(pcm, params);
1418                 if (snd_BUG_ON(err < 0))
1419                         return err;
1420         }
1421         return snd_pcm_hw_param_value(params, var, dir);
1422 }
1423
1424 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1425
1426 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1427                                   snd_pcm_hw_param_t var)
1428 {
1429         int changed;
1430         if (hw_is_mask(var))
1431                 changed = snd_mask_refine_last(hw_param_mask(params, var));
1432         else if (hw_is_interval(var))
1433                 changed = snd_interval_refine_last(hw_param_interval(params, var));
1434         else
1435                 return -EINVAL;
1436         if (changed) {
1437                 params->cmask |= 1 << var;
1438                 params->rmask |= 1 << var;
1439         }
1440         return changed;
1441 }
1442
1443
1444 /**
1445  * snd_pcm_hw_param_last - refine config space and return maximum value
1446  * @pcm: PCM instance
1447  * @params: the hw_params instance
1448  * @var: parameter to retrieve
1449  * @dir: pointer to the direction (-1,0,1) or %NULL
1450  *
1451  * Inside configuration space defined by @params remove from @var all
1452  * values < maximum. Reduce configuration space accordingly.
1453  * Return the maximum.
1454  */
1455 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1456                           struct snd_pcm_hw_params *params,
1457                           snd_pcm_hw_param_t var, int *dir)
1458 {
1459         int changed = _snd_pcm_hw_param_last(params, var);
1460         if (changed < 0)
1461                 return changed;
1462         if (params->rmask) {
1463                 int err = snd_pcm_hw_refine(pcm, params);
1464                 if (snd_BUG_ON(err < 0))
1465                         return err;
1466         }
1467         return snd_pcm_hw_param_value(params, var, dir);
1468 }
1469
1470 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1471
1472 /**
1473  * snd_pcm_hw_param_choose - choose a configuration defined by @params
1474  * @pcm: PCM instance
1475  * @params: the hw_params instance
1476  *
1477  * Choose one configuration from configuration space defined by @params.
1478  * The configuration chosen is that obtained fixing in this order:
1479  * first access, first format, first subformat, min channels,
1480  * min rate, min period time, max buffer size, min tick time
1481  */
1482 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1483                              struct snd_pcm_hw_params *params)
1484 {
1485         static int vars[] = {
1486                 SNDRV_PCM_HW_PARAM_ACCESS,
1487                 SNDRV_PCM_HW_PARAM_FORMAT,
1488                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1489                 SNDRV_PCM_HW_PARAM_CHANNELS,
1490                 SNDRV_PCM_HW_PARAM_RATE,
1491                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1492                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1493                 SNDRV_PCM_HW_PARAM_TICK_TIME,
1494                 -1
1495         };
1496         int err, *v;
1497
1498         for (v = vars; *v != -1; v++) {
1499                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1500                         err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1501                 else
1502                         err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1503                 if (snd_BUG_ON(err < 0))
1504                         return err;
1505         }
1506         return 0;
1507 }
1508
1509 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1510                                    void *arg)
1511 {
1512         struct snd_pcm_runtime *runtime = substream->runtime;
1513         unsigned long flags;
1514         snd_pcm_stream_lock_irqsave(substream, flags);
1515         if (snd_pcm_running(substream) &&
1516             snd_pcm_update_hw_ptr(substream) >= 0)
1517                 runtime->status->hw_ptr %= runtime->buffer_size;
1518         else
1519                 runtime->status->hw_ptr = 0;
1520         snd_pcm_stream_unlock_irqrestore(substream, flags);
1521         return 0;
1522 }
1523
1524 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1525                                           void *arg)
1526 {
1527         struct snd_pcm_channel_info *info = arg;
1528         struct snd_pcm_runtime *runtime = substream->runtime;
1529         int width;
1530         if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1531                 info->offset = -1;
1532                 return 0;
1533         }
1534         width = snd_pcm_format_physical_width(runtime->format);
1535         if (width < 0)
1536                 return width;
1537         info->offset = 0;
1538         switch (runtime->access) {
1539         case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1540         case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1541                 info->first = info->channel * width;
1542                 info->step = runtime->channels * width;
1543                 break;
1544         case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1545         case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1546         {
1547                 size_t size = runtime->dma_bytes / runtime->channels;
1548                 info->first = info->channel * size * 8;
1549                 info->step = width;
1550                 break;
1551         }
1552         default:
1553                 snd_BUG();
1554                 break;
1555         }
1556         return 0;
1557 }
1558
1559 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1560                                        void *arg)
1561 {
1562         struct snd_pcm_hw_params *params = arg;
1563         snd_pcm_format_t format;
1564         int channels, width;
1565
1566         params->fifo_size = substream->runtime->hw.fifo_size;
1567         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1568                 format = params_format(params);
1569                 channels = params_channels(params);
1570                 width = snd_pcm_format_physical_width(format);
1571                 params->fifo_size /= width * channels;
1572         }
1573         return 0;
1574 }
1575
1576 /**
1577  * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1578  * @substream: the pcm substream instance
1579  * @cmd: ioctl command
1580  * @arg: ioctl argument
1581  *
1582  * Processes the generic ioctl commands for PCM.
1583  * Can be passed as the ioctl callback for PCM ops.
1584  *
1585  * Returns zero if successful, or a negative error code on failure.
1586  */
1587 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1588                       unsigned int cmd, void *arg)
1589 {
1590         switch (cmd) {
1591         case SNDRV_PCM_IOCTL1_INFO:
1592                 return 0;
1593         case SNDRV_PCM_IOCTL1_RESET:
1594                 return snd_pcm_lib_ioctl_reset(substream, arg);
1595         case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1596                 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1597         case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1598                 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1599         }
1600         return -ENXIO;
1601 }
1602
1603 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1604
1605 /**
1606  * snd_pcm_period_elapsed - update the pcm status for the next period
1607  * @substream: the pcm substream instance
1608  *
1609  * This function is called from the interrupt handler when the
1610  * PCM has processed the period size.  It will update the current
1611  * pointer, wake up sleepers, etc.
1612  *
1613  * Even if more than one periods have elapsed since the last call, you
1614  * have to call this only once.
1615  */
1616 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1617 {
1618         struct snd_pcm_runtime *runtime;
1619         unsigned long flags;
1620
1621         if (PCM_RUNTIME_CHECK(substream))
1622                 return;
1623         runtime = substream->runtime;
1624
1625         if (runtime->transfer_ack_begin)
1626                 runtime->transfer_ack_begin(substream);
1627
1628         snd_pcm_stream_lock_irqsave(substream, flags);
1629         if (!snd_pcm_running(substream) ||
1630             snd_pcm_update_hw_ptr_interrupt(substream) < 0)
1631                 goto _end;
1632
1633         if (substream->timer_running)
1634                 snd_timer_interrupt(substream->timer, 1);
1635  _end:
1636         snd_pcm_stream_unlock_irqrestore(substream, flags);
1637         if (runtime->transfer_ack_end)
1638                 runtime->transfer_ack_end(substream);
1639         kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1640 }
1641
1642 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1643
1644 /*
1645  * Wait until avail_min data becomes available
1646  * Returns a negative error code if any error occurs during operation.
1647  * The available space is stored on availp.  When err = 0 and avail = 0
1648  * on the capture stream, it indicates the stream is in DRAINING state.
1649  */
1650 static int wait_for_avail_min(struct snd_pcm_substream *substream,
1651                               snd_pcm_uframes_t *availp)
1652 {
1653         struct snd_pcm_runtime *runtime = substream->runtime;
1654         int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1655         wait_queue_t wait;
1656         int err = 0;
1657         snd_pcm_uframes_t avail = 0;
1658         long tout;
1659
1660         init_waitqueue_entry(&wait, current);
1661         add_wait_queue(&runtime->sleep, &wait);
1662         for (;;) {
1663                 if (signal_pending(current)) {
1664                         err = -ERESTARTSYS;
1665                         break;
1666                 }
1667                 set_current_state(TASK_INTERRUPTIBLE);
1668                 snd_pcm_stream_unlock_irq(substream);
1669                 tout = schedule_timeout(msecs_to_jiffies(10000));
1670                 snd_pcm_stream_lock_irq(substream);
1671                 switch (runtime->status->state) {
1672                 case SNDRV_PCM_STATE_SUSPENDED:
1673                         err = -ESTRPIPE;
1674                         goto _endloop;
1675                 case SNDRV_PCM_STATE_XRUN:
1676                         err = -EPIPE;
1677                         goto _endloop;
1678                 case SNDRV_PCM_STATE_DRAINING:
1679                         if (is_playback)
1680                                 err = -EPIPE;
1681                         else
1682                                 avail = 0; /* indicate draining */
1683                         goto _endloop;
1684                 case SNDRV_PCM_STATE_OPEN:
1685                 case SNDRV_PCM_STATE_SETUP:
1686                 case SNDRV_PCM_STATE_DISCONNECTED:
1687                         err = -EBADFD;
1688                         goto _endloop;
1689                 }
1690                 if (!tout) {
1691                         snd_printd("%s write error (DMA or IRQ trouble?)\n",
1692                                    is_playback ? "playback" : "capture");
1693                         err = -EIO;
1694                         break;
1695                 }
1696                 if (is_playback)
1697                         avail = snd_pcm_playback_avail(runtime);
1698                 else
1699                         avail = snd_pcm_capture_avail(runtime);
1700                 if (avail >= runtime->control->avail_min)
1701                         break;
1702         }
1703  _endloop:
1704         remove_wait_queue(&runtime->sleep, &wait);
1705         *availp = avail;
1706         return err;
1707 }
1708
1709 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1710                                       unsigned int hwoff,
1711                                       unsigned long data, unsigned int off,
1712                                       snd_pcm_uframes_t frames)
1713 {
1714         struct snd_pcm_runtime *runtime = substream->runtime;
1715         int err;
1716         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1717         if (substream->ops->copy) {
1718                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1719                         return err;
1720         } else {
1721                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1722                 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1723                         return -EFAULT;
1724         }
1725         return 0;
1726 }
1727
1728 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1729                           unsigned long data, unsigned int off,
1730                           snd_pcm_uframes_t size);
1731
1732 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1733                                             unsigned long data,
1734                                             snd_pcm_uframes_t size,
1735                                             int nonblock,
1736                                             transfer_f transfer)
1737 {
1738         struct snd_pcm_runtime *runtime = substream->runtime;
1739         snd_pcm_uframes_t xfer = 0;
1740         snd_pcm_uframes_t offset = 0;
1741         int err = 0;
1742
1743         if (size == 0)
1744                 return 0;
1745
1746         snd_pcm_stream_lock_irq(substream);
1747         switch (runtime->status->state) {
1748         case SNDRV_PCM_STATE_PREPARED:
1749         case SNDRV_PCM_STATE_RUNNING:
1750         case SNDRV_PCM_STATE_PAUSED:
1751                 break;
1752         case SNDRV_PCM_STATE_XRUN:
1753                 err = -EPIPE;
1754                 goto _end_unlock;
1755         case SNDRV_PCM_STATE_SUSPENDED:
1756                 err = -ESTRPIPE;
1757                 goto _end_unlock;
1758         default:
1759                 err = -EBADFD;
1760                 goto _end_unlock;
1761         }
1762
1763         while (size > 0) {
1764                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1765                 snd_pcm_uframes_t avail;
1766                 snd_pcm_uframes_t cont;
1767                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1768                         snd_pcm_update_hw_ptr(substream);
1769                 avail = snd_pcm_playback_avail(runtime);
1770                 if (!avail) {
1771                         if (nonblock) {
1772                                 err = -EAGAIN;
1773                                 goto _end_unlock;
1774                         }
1775                         err = wait_for_avail_min(substream, &avail);
1776                         if (err < 0)
1777                                 goto _end_unlock;
1778                 }
1779                 frames = size > avail ? avail : size;
1780                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1781                 if (frames > cont)
1782                         frames = cont;
1783                 if (snd_BUG_ON(!frames)) {
1784                         snd_pcm_stream_unlock_irq(substream);
1785                         return -EINVAL;
1786                 }
1787                 appl_ptr = runtime->control->appl_ptr;
1788                 appl_ofs = appl_ptr % runtime->buffer_size;
1789                 snd_pcm_stream_unlock_irq(substream);
1790                 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
1791                         goto _end;
1792                 snd_pcm_stream_lock_irq(substream);
1793                 switch (runtime->status->state) {
1794                 case SNDRV_PCM_STATE_XRUN:
1795                         err = -EPIPE;
1796                         goto _end_unlock;
1797                 case SNDRV_PCM_STATE_SUSPENDED:
1798                         err = -ESTRPIPE;
1799                         goto _end_unlock;
1800                 default:
1801                         break;
1802                 }
1803                 appl_ptr += frames;
1804                 if (appl_ptr >= runtime->boundary)
1805                         appl_ptr -= runtime->boundary;
1806                 runtime->control->appl_ptr = appl_ptr;
1807                 if (substream->ops->ack)
1808                         substream->ops->ack(substream);
1809
1810                 offset += frames;
1811                 size -= frames;
1812                 xfer += frames;
1813                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1814                     snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1815                         err = snd_pcm_start(substream);
1816                         if (err < 0)
1817                                 goto _end_unlock;
1818                 }
1819         }
1820  _end_unlock:
1821         snd_pcm_stream_unlock_irq(substream);
1822  _end:
1823         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1824 }
1825
1826 /* sanity-check for read/write methods */
1827 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1828 {
1829         struct snd_pcm_runtime *runtime;
1830         if (PCM_RUNTIME_CHECK(substream))
1831                 return -ENXIO;
1832         runtime = substream->runtime;
1833         if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1834                 return -EINVAL;
1835         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1836                 return -EBADFD;
1837         return 0;
1838 }
1839
1840 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1841 {
1842         struct snd_pcm_runtime *runtime;
1843         int nonblock;
1844         int err;
1845
1846         err = pcm_sanity_check(substream);
1847         if (err < 0)
1848                 return err;
1849         runtime = substream->runtime;
1850         nonblock = !!(substream->f_flags & O_NONBLOCK);
1851
1852         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1853             runtime->channels > 1)
1854                 return -EINVAL;
1855         return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1856                                   snd_pcm_lib_write_transfer);
1857 }
1858
1859 EXPORT_SYMBOL(snd_pcm_lib_write);
1860
1861 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1862                                        unsigned int hwoff,
1863                                        unsigned long data, unsigned int off,
1864                                        snd_pcm_uframes_t frames)
1865 {
1866         struct snd_pcm_runtime *runtime = substream->runtime;
1867         int err;
1868         void __user **bufs = (void __user **)data;
1869         int channels = runtime->channels;
1870         int c;
1871         if (substream->ops->copy) {
1872                 if (snd_BUG_ON(!substream->ops->silence))
1873                         return -EINVAL;
1874                 for (c = 0; c < channels; ++c, ++bufs) {
1875                         if (*bufs == NULL) {
1876                                 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1877                                         return err;
1878                         } else {
1879                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1880                                 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1881                                         return err;
1882                         }
1883                 }
1884         } else {
1885                 /* default transfer behaviour */
1886                 size_t dma_csize = runtime->dma_bytes / channels;
1887                 for (c = 0; c < channels; ++c, ++bufs) {
1888                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1889                         if (*bufs == NULL) {
1890                                 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1891                         } else {
1892                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1893                                 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1894                                         return -EFAULT;
1895                         }
1896                 }
1897         }
1898         return 0;
1899 }
1900
1901 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1902                                      void __user **bufs,
1903                                      snd_pcm_uframes_t frames)
1904 {
1905         struct snd_pcm_runtime *runtime;
1906         int nonblock;
1907         int err;
1908
1909         err = pcm_sanity_check(substream);
1910         if (err < 0)
1911                 return err;
1912         runtime = substream->runtime;
1913         nonblock = !!(substream->f_flags & O_NONBLOCK);
1914
1915         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1916                 return -EINVAL;
1917         return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1918                                   nonblock, snd_pcm_lib_writev_transfer);
1919 }
1920
1921 EXPORT_SYMBOL(snd_pcm_lib_writev);
1922
1923 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
1924                                      unsigned int hwoff,
1925                                      unsigned long data, unsigned int off,
1926                                      snd_pcm_uframes_t frames)
1927 {
1928         struct snd_pcm_runtime *runtime = substream->runtime;
1929         int err;
1930         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1931         if (substream->ops->copy) {
1932                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1933                         return err;
1934         } else {
1935                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1936                 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
1937                         return -EFAULT;
1938         }
1939         return 0;
1940 }
1941
1942 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
1943                                            unsigned long data,
1944                                            snd_pcm_uframes_t size,
1945                                            int nonblock,
1946                                            transfer_f transfer)
1947 {
1948         struct snd_pcm_runtime *runtime = substream->runtime;
1949         snd_pcm_uframes_t xfer = 0;
1950         snd_pcm_uframes_t offset = 0;
1951         int err = 0;
1952
1953         if (size == 0)
1954                 return 0;
1955
1956         snd_pcm_stream_lock_irq(substream);
1957         switch (runtime->status->state) {
1958         case SNDRV_PCM_STATE_PREPARED:
1959                 if (size >= runtime->start_threshold) {
1960                         err = snd_pcm_start(substream);
1961                         if (err < 0)
1962                                 goto _end_unlock;
1963                 }
1964                 break;
1965         case SNDRV_PCM_STATE_DRAINING:
1966         case SNDRV_PCM_STATE_RUNNING:
1967         case SNDRV_PCM_STATE_PAUSED:
1968                 break;
1969         case SNDRV_PCM_STATE_XRUN:
1970                 err = -EPIPE;
1971                 goto _end_unlock;
1972         case SNDRV_PCM_STATE_SUSPENDED:
1973                 err = -ESTRPIPE;
1974                 goto _end_unlock;
1975         default:
1976                 err = -EBADFD;
1977                 goto _end_unlock;
1978         }
1979
1980         while (size > 0) {
1981                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1982                 snd_pcm_uframes_t avail;
1983                 snd_pcm_uframes_t cont;
1984                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1985                         snd_pcm_update_hw_ptr(substream);
1986                 avail = snd_pcm_capture_avail(runtime);
1987                 if (!avail) {
1988                         if (runtime->status->state ==
1989                             SNDRV_PCM_STATE_DRAINING) {
1990                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
1991                                 goto _end_unlock;
1992                         }
1993                         if (nonblock) {
1994                                 err = -EAGAIN;
1995                                 goto _end_unlock;
1996                         }
1997                         err = wait_for_avail_min(substream, &avail);
1998                         if (err < 0)
1999                                 goto _end_unlock;
2000                         if (!avail)
2001                                 continue; /* draining */
2002                 }
2003                 frames = size > avail ? avail : size;
2004                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2005                 if (frames > cont)
2006                         frames = cont;
2007                 if (snd_BUG_ON(!frames)) {
2008                         snd_pcm_stream_unlock_irq(substream);
2009                         return -EINVAL;
2010                 }
2011                 appl_ptr = runtime->control->appl_ptr;
2012                 appl_ofs = appl_ptr % runtime->buffer_size;
2013                 snd_pcm_stream_unlock_irq(substream);
2014                 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2015                         goto _end;
2016                 snd_pcm_stream_lock_irq(substream);
2017                 switch (runtime->status->state) {
2018                 case SNDRV_PCM_STATE_XRUN:
2019                         err = -EPIPE;
2020                         goto _end_unlock;
2021                 case SNDRV_PCM_STATE_SUSPENDED:
2022                         err = -ESTRPIPE;
2023                         goto _end_unlock;
2024                 default:
2025                         break;
2026                 }
2027                 appl_ptr += frames;
2028                 if (appl_ptr >= runtime->boundary)
2029                         appl_ptr -= runtime->boundary;
2030                 runtime->control->appl_ptr = appl_ptr;
2031                 if (substream->ops->ack)
2032                         substream->ops->ack(substream);
2033
2034                 offset += frames;
2035                 size -= frames;
2036                 xfer += frames;
2037         }
2038  _end_unlock:
2039         snd_pcm_stream_unlock_irq(substream);
2040  _end:
2041         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2042 }
2043
2044 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2045 {
2046         struct snd_pcm_runtime *runtime;
2047         int nonblock;
2048         int err;
2049
2050         err = pcm_sanity_check(substream);
2051         if (err < 0)
2052                 return err;
2053         runtime = substream->runtime;
2054         nonblock = !!(substream->f_flags & O_NONBLOCK);
2055         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2056                 return -EINVAL;
2057         return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2058 }
2059
2060 EXPORT_SYMBOL(snd_pcm_lib_read);
2061
2062 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2063                                       unsigned int hwoff,
2064                                       unsigned long data, unsigned int off,
2065                                       snd_pcm_uframes_t frames)
2066 {
2067         struct snd_pcm_runtime *runtime = substream->runtime;
2068         int err;
2069         void __user **bufs = (void __user **)data;
2070         int channels = runtime->channels;
2071         int c;
2072         if (substream->ops->copy) {
2073                 for (c = 0; c < channels; ++c, ++bufs) {
2074                         char __user *buf;
2075                         if (*bufs == NULL)
2076                                 continue;
2077                         buf = *bufs + samples_to_bytes(runtime, off);
2078                         if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2079                                 return err;
2080                 }
2081         } else {
2082                 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2083                 for (c = 0; c < channels; ++c, ++bufs) {
2084                         char *hwbuf;
2085                         char __user *buf;
2086                         if (*bufs == NULL)
2087                                 continue;
2088
2089                         hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2090                         buf = *bufs + samples_to_bytes(runtime, off);
2091                         if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2092                                 return -EFAULT;
2093                 }
2094         }
2095         return 0;
2096 }
2097
2098 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2099                                     void __user **bufs,
2100                                     snd_pcm_uframes_t frames)
2101 {
2102         struct snd_pcm_runtime *runtime;
2103         int nonblock;
2104         int err;
2105
2106         err = pcm_sanity_check(substream);
2107         if (err < 0)
2108                 return err;
2109         runtime = substream->runtime;
2110         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2111                 return -EBADFD;
2112
2113         nonblock = !!(substream->f_flags & O_NONBLOCK);
2114         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2115                 return -EINVAL;
2116         return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2117 }
2118
2119 EXPORT_SYMBOL(snd_pcm_lib_readv);