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 <linux/math64.h>
  26 #include <sound/core.h>
  27 #include <sound/control.h>
  28 #include <sound/info.h>
  29 #include <sound/pcm.h>
  30 #include <sound/pcm_params.h>
  31 #include <sound/timer.h>
  32
  33 /*
  34  * fill ring buffer with silence
  35  * runtime->silence_start: starting pointer to silence area
  36  * runtime->silence_filled: size filled with silence
  37  * runtime->silence_threshold: threshold from application
  38  * runtime->silence_size: maximal size from application
  39  *
  40  * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
  41  */
  42 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
  43 {
  44         struct snd_pcm_runtime *runtime = substream->runtime;
  45         snd_pcm_uframes_t frames, ofs, transfer;
  46
  47         if (runtime->silence_size < runtime->boundary) {
  48                 snd_pcm_sframes_t noise_dist, n;
  49                 if (runtime->silence_start != runtime->control->appl_ptr) {
  50                         n = runtime->control->appl_ptr - runtime->silence_start;
  51                         if (n < 0)
  52                                 n += runtime->boundary;
  53                         if ((snd_pcm_uframes_t)n < runtime->silence_filled)
  54                                 runtime->silence_filled -= n;
  55                         else
  56                                 runtime->silence_filled = 0;
  57                         runtime->silence_start = runtime->control->appl_ptr;
  58                 }
  59                 if (runtime->silence_filled >= runtime->buffer_size)
  60                         return;
  61                 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
  62                 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
  63                         return;
  64                 frames = runtime->silence_threshold - noise_dist;
  65                 if (frames > runtime->silence_size)
  66                         frames = runtime->silence_size;
  67         } else {
  68                 if (new_hw_ptr == ULONG_MAX) {  /* initialization */
  69                         snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
  70                         if (avail > runtime->buffer_size)
  71                                 avail = runtime->buffer_size;
  72                         runtime->silence_filled = avail > 0 ? avail : 0;
  73                         runtime->silence_start = (runtime->status->hw_ptr +
  74                                                   runtime->silence_filled) %
  75                                                  runtime->boundary;
  76                 } else {
  77                         ofs = runtime->status->hw_ptr;
  78                         frames = new_hw_ptr - ofs;
  79                         if ((snd_pcm_sframes_t)frames < 0)
  80                                 frames += runtime->boundary;
  81                         runtime->silence_filled -= frames;
  82                         if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
  83                                 runtime->silence_filled = 0;
  84                                 runtime->silence_start = new_hw_ptr;
  85                         } else {
  86                                 runtime->silence_start = ofs;
  87                         }
  88                 }
  89                 frames = runtime->buffer_size - runtime->silence_filled;
  90         }
  91         if (snd_BUG_ON(frames > runtime->buffer_size))
  92                 return;
  93         if (frames == 0)
  94                 return;
  95         ofs = runtime->silence_start % runtime->buffer_size;
  96         while (frames > 0) {
  97                 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
  98                 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
  99                     runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
 100                         if (substream->ops->silence) {
 101                                 int err;
 102                                 err = substream->ops->silence(substream, -1, ofs, transfer);
 103                                 snd_BUG_ON(err < 0);
 104                         } else {
 105                                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
 106                                 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
 107                         }
 108                 } else {
 109                         unsigned int c;
 110                         unsigned int channels = runtime->channels;
 111                         if (substream->ops->silence) {
 112                                 for (c = 0; c < channels; ++c) {
 113                                         int err;
 114                                         err = substream->ops->silence(substream, c, ofs, transfer);
 115                                         snd_BUG_ON(err < 0);
 116                                 }
 117                         } else {
 118                                 size_t dma_csize = runtime->dma_bytes / channels;
 119                                 for (c = 0; c < channels; ++c) {
 120                                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
 121                                         snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
 122                                 }
 123                         }
 124                 }
 125                 runtime->silence_filled += transfer;
 126                 frames -= transfer;
 127                 ofs = 0;
 128         }
 129 }
 130
 131 static void pcm_debug_name(struct snd_pcm_substream *substream,
 132                            char *name, size_t len)
 133 {
 134         snprintf(name, len, "pcmC%dD%d%c:%d",
 135                  substream->pcm->card->number,
 136                  substream->pcm->device,
 137                  substream->stream ? 'c' : 'p',
 138                  substream->number);
 139 }
 140
 141 #define XRUN_DEBUG_BASIC        (1<<0)
 142 #define XRUN_DEBUG_STACK        (1<<1)  /* dump also stack */
 143 #define XRUN_DEBUG_JIFFIESCHECK (1<<2)  /* do jiffies check */
 144 #define XRUN_DEBUG_PERIODUPDATE (1<<3)  /* full period update info */
 145 #define XRUN_DEBUG_HWPTRUPDATE  (1<<4)  /* full hwptr update info */
 146 #define XRUN_DEBUG_LOG          (1<<5)  /* show last 10 positions on err */
 147 #define XRUN_DEBUG_LOGONCE      (1<<6)  /* do above only once */
 148
 149 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 150
 151 #define xrun_debug(substream, mask) \
 152                         ((substream)->pstr->xrun_debug & (mask))
 153 #else
 154 #define xrun_debug(substream, mask)     0
 155 #endif
 156
 157 #define dump_stack_on_xrun(substream) do {                      \
 158                 if (xrun_debug(substream, XRUN_DEBUG_STACK))    \
 159                         dump_stack();                           \
 160         } while (0)
 161
 162 static void xrun(struct snd_pcm_substream *substream)
 163 {
 164         struct snd_pcm_runtime *runtime = substream->runtime;
 165
 166         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 167                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 168         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 169         if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
 170                 char name[16];
 171                 pcm_debug_name(substream, name, sizeof(name));
 172                 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
 173                 dump_stack_on_xrun(substream);
 174         }
 175 }
 176
 177 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 178 #define hw_ptr_error(substream, fmt, args...)                           \
 179         do {                                                            \
 180                 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {          \
 181                         xrun_log_show(substream);                       \
 182                         if (printk_ratelimit()) {                       \
 183                                 snd_printd("PCM: " fmt, ##args);        \
 184                         }                                               \
 185                         dump_stack_on_xrun(substream);                  \
 186                 }                                                       \
 187         } while (0)
 188
 189 #define XRUN_LOG_CNT    10
 190
 191 struct hwptr_log_entry {
 192         unsigned long jiffies;
 193         snd_pcm_uframes_t pos;
 194         snd_pcm_uframes_t period_size;
 195         snd_pcm_uframes_t buffer_size;
 196         snd_pcm_uframes_t old_hw_ptr;
 197         snd_pcm_uframes_t hw_ptr_base;
 198 };
 199
 200 struct snd_pcm_hwptr_log {
 201         unsigned int idx;
 202         unsigned int hit: 1;
 203         struct hwptr_log_entry entries[XRUN_LOG_CNT];
 204 };
 205
 206 static void xrun_log(struct snd_pcm_substream *substream,
 207                      snd_pcm_uframes_t pos)
 208 {
 209         struct snd_pcm_runtime *runtime = substream->runtime;
 210         struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
 211         struct hwptr_log_entry *entry;
 212
 213         if (log == NULL) {
 214                 log = kzalloc(sizeof(*log), GFP_ATOMIC);
 215                 if (log == NULL)
 216                         return;
 217                 runtime->hwptr_log = log;
 218         } else {
 219                 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
 220                         return;
 221         }
 222         entry = &log->entries[log->idx];
 223         entry->jiffies = jiffies;
 224         entry->pos = pos;
 225         entry->period_size = runtime->period_size;
 226         entry->buffer_size = runtime->buffer_size;
 227         entry->old_hw_ptr = runtime->status->hw_ptr;
 228         entry->hw_ptr_base = runtime->hw_ptr_base;
 229         log->idx = (log->idx + 1) % XRUN_LOG_CNT;
 230 }
 231
 232 static void xrun_log_show(struct snd_pcm_substream *substream)
 233 {
 234         struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
 235         struct hwptr_log_entry *entry;
 236         char name[16];
 237         unsigned int idx;
 238         int cnt;
 239
 240         if (log == NULL)
 241                 return;
 242         if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
 243                 return;
 244         pcm_debug_name(substream, name, sizeof(name));
 245         for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
 246                 entry = &log->entries[idx];
 247                 if (entry->period_size == 0)
 248                         break;
 249                 snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
 250                            "hwptr=%ld/%ld\n",
 251                            name, entry->jiffies, (unsigned long)entry->pos,
 252                            (unsigned long)entry->period_size,
 253                            (unsigned long)entry->buffer_size,
 254                            (unsigned long)entry->old_hw_ptr,
 255                            (unsigned long)entry->hw_ptr_base);
 256                 idx++;
 257                 idx %= XRUN_LOG_CNT;
 258         }
 259         log->hit = 1;
 260 }
 261
 262 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
 263
 264 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
 265 #define xrun_log(substream, pos)        do { } while (0)
 266 #define xrun_log_show(substream)        do { } while (0)
 267
 268 #endif
 269
 270 int snd_pcm_update_state(struct snd_pcm_substream *substream,
 271                          struct snd_pcm_runtime *runtime)
 272 {
 273         snd_pcm_uframes_t avail;
 274
 275         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 276                 avail = snd_pcm_playback_avail(runtime);
 277         else
 278                 avail = snd_pcm_capture_avail(runtime);
 279         if (avail > runtime->avail_max)
 280                 runtime->avail_max = avail;
 281         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 282                 if (avail >= runtime->buffer_size) {
 283                         snd_pcm_drain_done(substream);
 284                         return -EPIPE;
 285                 }
 286         } else {
 287                 if (avail >= runtime->stop_threshold) {
 288                         xrun(substream);
 289                         return -EPIPE;
 290                 }
 291         }
 292         if (runtime->twake) {
 293                 if (avail >= runtime->twake)
 294                         wake_up(&runtime->tsleep);
 295         } else if (avail >= runtime->control->avail_min)
 296                 wake_up(&runtime->sleep);
 297         return 0;
 298 }
 299
 300 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
 301                                   unsigned int in_interrupt)
 302 {
 303         struct snd_pcm_runtime *runtime = substream->runtime;
 304         snd_pcm_uframes_t pos;
 305         snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
 306         snd_pcm_sframes_t hdelta, delta;
 307         unsigned long jdelta;
 308
 309         old_hw_ptr = runtime->status->hw_ptr;
 310         pos = substream->ops->pointer(substream);
 311         if (pos == SNDRV_PCM_POS_XRUN) {
 312                 xrun(substream);
 313                 return -EPIPE;
 314         }
 315         if (pos >= runtime->buffer_size) {
 316                 if (printk_ratelimit()) {
 317                         char name[16];
 318                         pcm_debug_name(substream, name, sizeof(name));
 319                         xrun_log_show(substream);
 320                         snd_printd(KERN_ERR  "BUG: %s, pos = %ld, "
 321                                    "buffer size = %ld, period size = %ld\n",
 322                                    name, pos, runtime->buffer_size,
 323                                    runtime->period_size);
 324                 }
 325                 pos = 0;
 326         }
 327         pos -= pos % runtime->min_align;
 328         if (xrun_debug(substream, XRUN_DEBUG_LOG))
 329                 xrun_log(substream, pos);
 330         hw_base = runtime->hw_ptr_base;
 331         new_hw_ptr = hw_base + pos;
 332         if (in_interrupt) {
 333                 /* we know that one period was processed */
 334                 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
 335                 delta = runtime->hw_ptr_interrupt + runtime->period_size;
 336                 if (delta > new_hw_ptr) {
 337                         /* check for double acknowledged interrupts */
 338                         hdelta = jiffies - runtime->hw_ptr_jiffies;
 339                         if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
 340                                 hw_base += runtime->buffer_size;
 341                                 if (hw_base >= runtime->boundary)
 342                                         hw_base = 0;
 343                                 new_hw_ptr = hw_base + pos;
 344                                 goto __delta;
 345                         }
 346                 }
 347         }
 348         /* new_hw_ptr might be lower than old_hw_ptr in case when */
 349         /* pointer crosses the end of the ring buffer */
 350         if (new_hw_ptr < old_hw_ptr) {
 351                 hw_base += runtime->buffer_size;
 352                 if (hw_base >= runtime->boundary)
 353                         hw_base = 0;
 354                 new_hw_ptr = hw_base + pos;
 355         }
 356       __delta:
 357         delta = new_hw_ptr - old_hw_ptr;
 358         if (delta < 0)
 359                 delta += runtime->boundary;
 360         if (xrun_debug(substream, in_interrupt ?
 361                         XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
 362                 char name[16];
 363                 pcm_debug_name(substream, name, sizeof(name));
 364                 snd_printd("%s_update: %s: pos=%u/%u/%u, "
 365                            "hwptr=%ld/%ld/%ld/%ld\n",
 366                            in_interrupt ? "period" : "hwptr",
 367                            name,
 368                            (unsigned int)pos,
 369                            (unsigned int)runtime->period_size,
 370                            (unsigned int)runtime->buffer_size,
 371                            (unsigned long)delta,
 372                            (unsigned long)old_hw_ptr,
 373                            (unsigned long)new_hw_ptr,
 374                            (unsigned long)runtime->hw_ptr_base);
 375         }
 376
 377         if (runtime->no_period_wakeup) {
 378                 /*
 379                  * Without regular period interrupts, we have to check
 380                  * the elapsed time to detect xruns.
 381                  */
 382                 jdelta = jiffies - runtime->hw_ptr_jiffies;
 383                 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
 384                         goto no_delta_check;
 385                 hdelta = jdelta - delta * HZ / runtime->rate;
 386                 while (hdelta > runtime->hw_ptr_buffer_jiffies / 2 + 1) {
 387                         delta += runtime->buffer_size;
 388                         hw_base += runtime->buffer_size;
 389                         if (hw_base >= runtime->boundary)
 390                                 hw_base = 0;
 391                         new_hw_ptr = hw_base + pos;
 392                         hdelta -= runtime->hw_ptr_buffer_jiffies;
 393                 }
 394                 goto no_delta_check;
 395         }
 396
 397         /* something must be really wrong */
 398         if (delta >= runtime->buffer_size + runtime->period_size) {
 399                 hw_ptr_error(substream,
 400                                "Unexpected hw_pointer value %s"
 401                                "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
 402                                "old_hw_ptr=%ld)\n",
 403                                      in_interrupt ? "[Q] " : "[P]",
 404                                      substream->stream, (long)pos,
 405                                      (long)new_hw_ptr, (long)old_hw_ptr);
 406                 return 0;
 407         }
 408
 409         /* Do jiffies check only in xrun_debug mode */
 410         if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
 411                 goto no_jiffies_check;
 412
 413         /* Skip the jiffies check for hardwares with BATCH flag.
 414          * Such hardware usually just increases the position at each IRQ,
 415          * thus it can't give any strange position.
 416          */
 417         if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
 418                 goto no_jiffies_check;
 419         hdelta = delta;
 420         if (hdelta < runtime->delay)
 421                 goto no_jiffies_check;
 422         hdelta -= runtime->delay;
 423         jdelta = jiffies - runtime->hw_ptr_jiffies;
 424         if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
 425                 delta = jdelta /
 426                         (((runtime->period_size * HZ) / runtime->rate)
 427                                                                 + HZ/100);
 428                 /* move new_hw_ptr according jiffies not pos variable */
 429                 new_hw_ptr = old_hw_ptr;
 430                 hw_base = delta;
 431                 /* use loop to avoid checks for delta overflows */
 432                 /* the delta value is small or zero in most cases */
 433                 while (delta > 0) {
 434                         new_hw_ptr += runtime->period_size;
 435                         if (new_hw_ptr >= runtime->boundary)
 436                                 new_hw_ptr -= runtime->boundary;
 437                         delta--;
 438                 }
 439                 /* align hw_base to buffer_size */
 440                 hw_ptr_error(substream,
 441                              "hw_ptr skipping! %s"
 442                              "(pos=%ld, delta=%ld, period=%ld, "
 443                              "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
 444                              in_interrupt ? "[Q] " : "",
 445                              (long)pos, (long)hdelta,
 446                              (long)runtime->period_size, jdelta,
 447                              ((hdelta * HZ) / runtime->rate), hw_base,
 448                              (unsigned long)old_hw_ptr,
 449                              (unsigned long)new_hw_ptr);
 450                 /* reset values to proper state */
 451                 delta = 0;
 452                 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
 453         }
 454  no_jiffies_check:
 455         if (delta > runtime->period_size + runtime->period_size / 2) {
 456                 hw_ptr_error(substream,
 457                              "Lost interrupts? %s"
 458                              "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
 459                              "old_hw_ptr=%ld)\n",
 460                              in_interrupt ? "[Q] " : "",
 461                              substream->stream, (long)delta,
 462                              (long)new_hw_ptr,
 463                              (long)old_hw_ptr);
 464         }
 465
 466  no_delta_check:
 467         if (runtime->status->hw_ptr == new_hw_ptr)
 468                 return 0;
 469
 470         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 471             runtime->silence_size > 0)
 472                 snd_pcm_playback_silence(substream, new_hw_ptr);
 473
 474         if (in_interrupt) {
 475                 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
 476                 if (delta < 0)
 477                         delta += runtime->boundary;
 478                 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
 479                 runtime->hw_ptr_interrupt += delta;
 480                 if (runtime->hw_ptr_interrupt >= runtime->boundary)
 481                         runtime->hw_ptr_interrupt -= runtime->boundary;
 482         }
 483         runtime->hw_ptr_base = hw_base;
 484         runtime->status->hw_ptr = new_hw_ptr;
 485         runtime->hw_ptr_jiffies = jiffies;
 486         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 487                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 488
 489         return snd_pcm_update_state(substream, runtime);
 490 }
 491
 492 /* CAUTION: call it with irq disabled */
 493 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 494 {
 495         return snd_pcm_update_hw_ptr0(substream, 0);
 496 }
 497
 498 /**
 499  * snd_pcm_set_ops - set the PCM operators
 500  * @pcm: the pcm instance
 501  * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 502  * @ops: the operator table
 503  *
 504  * Sets the given PCM operators to the pcm instance.
 505  */
 506 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
 507 {
 508         struct snd_pcm_str *stream = &pcm->streams[direction];
 509         struct snd_pcm_substream *substream;
 510
 511         for (substream = stream->substream; substream != NULL; substream = substream->next)
 512                 substream->ops = ops;
 513 }
 514
 515 EXPORT_SYMBOL(snd_pcm_set_ops);
 516
 517 /**
 518  * snd_pcm_sync - set the PCM sync id
 519  * @substream: the pcm substream
 520  *
 521  * Sets the PCM sync identifier for the card.
 522  */
 523 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
 524 {
 525         struct snd_pcm_runtime *runtime = substream->runtime;
 526
 527         runtime->sync.id32[0] = substream->pcm->card->number;
 528         runtime->sync.id32[1] = -1;
 529         runtime->sync.id32[2] = -1;
 530         runtime->sync.id32[3] = -1;
 531 }
 532
 533 EXPORT_SYMBOL(snd_pcm_set_sync);
 534
 535 /*
 536  *  Standard ioctl routine
 537  */
 538
 539 static inline unsigned int div32(unsigned int a, unsigned int b,
 540                                  unsigned int *r)
 541 {
 542         if (b == 0) {
 543                 *r = 0;
 544                 return UINT_MAX;
 545         }
 546         *r = a % b;
 547         return a / b;
 548 }
 549
 550 static inline unsigned int div_down(unsigned int a, unsigned int b)
 551 {
 552         if (b == 0)
 553                 return UINT_MAX;
 554         return a / b;
 555 }
 556
 557 static inline unsigned int div_up(unsigned int a, unsigned int b)
 558 {
 559         unsigned int r;
 560         unsigned int q;
 561         if (b == 0)
 562                 return UINT_MAX;
 563         q = div32(a, b, &r);
 564         if (r)
 565                 ++q;
 566         return q;
 567 }
 568
 569 static inline unsigned int mul(unsigned int a, unsigned int b)
 570 {
 571         if (a == 0)
 572                 return 0;
 573         if (div_down(UINT_MAX, a) < b)
 574                 return UINT_MAX;
 575         return a * b;
 576 }
 577
 578 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
 579                                     unsigned int c, unsigned int *r)
 580 {
 581         u_int64_t n = (u_int64_t) a * b;
 582         if (c == 0) {
 583                 snd_BUG_ON(!n);
 584                 *r = 0;
 585                 return UINT_MAX;
 586         }
 587         n = div_u64_rem(n, c, r);
 588         if (n >= UINT_MAX) {
 589                 *r = 0;
 590                 return UINT_MAX;
 591         }
 592         return n;
 593 }
 594
 595 /**
 596  * snd_interval_refine - refine the interval value of configurator
 597  * @i: the interval value to refine
 598  * @v: the interval value to refer to
 599  *
 600  * Refines the interval value with the reference value.
 601  * The interval is changed to the range satisfying both intervals.
 602  * The interval status (min, max, integer, etc.) are evaluated.
 603  *
 604  * Returns non-zero if the value is changed, zero if not changed.
 605  */
 606 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
 607 {
 608         int changed = 0;
 609         if (snd_BUG_ON(snd_interval_empty(i)))
 610                 return -EINVAL;
 611         if (i->min < v->min) {
 612                 i->min = v->min;
 613                 i->openmin = v->openmin;
 614                 changed = 1;
 615         } else if (i->min == v->min && !i->openmin && v->openmin) {
 616                 i->openmin = 1;
 617                 changed = 1;
 618         }
 619         if (i->max > v->max) {
 620                 i->max = v->max;
 621                 i->openmax = v->openmax;
 622                 changed = 1;
 623         } else if (i->max == v->max && !i->openmax && v->openmax) {
 624                 i->openmax = 1;
 625                 changed = 1;
 626         }
 627         if (!i->integer && v->integer) {
 628                 i->integer = 1;
 629                 changed = 1;
 630         }
 631         if (i->integer) {
 632                 if (i->openmin) {
 633                         i->min++;
 634                         i->openmin = 0;
 635                 }
 636                 if (i->openmax) {
 637                         i->max--;
 638                         i->openmax = 0;
 639                 }
 640         } else if (!i->openmin && !i->openmax && i->min == i->max)
 641                 i->integer = 1;
 642         if (snd_interval_checkempty(i)) {
 643                 snd_interval_none(i);
 644                 return -EINVAL;
 645         }
 646         return changed;
 647 }
 648
 649 EXPORT_SYMBOL(snd_interval_refine);
 650
 651 static int snd_interval_refine_first(struct snd_interval *i)
 652 {
 653         if (snd_BUG_ON(snd_interval_empty(i)))
 654                 return -EINVAL;
 655         if (snd_interval_single(i))
 656                 return 0;
 657         i->max = i->min;
 658         i->openmax = i->openmin;
 659         if (i->openmax)
 660                 i->max++;
 661         return 1;
 662 }
 663
 664 static int snd_interval_refine_last(struct snd_interval *i)
 665 {
 666         if (snd_BUG_ON(snd_interval_empty(i)))
 667                 return -EINVAL;
 668         if (snd_interval_single(i))
 669                 return 0;
 670         i->min = i->max;
 671         i->openmin = i->openmax;
 672         if (i->openmin)
 673                 i->min--;
 674         return 1;
 675 }
 676
 677 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 678 {
 679         if (a->empty || b->empty) {
 680                 snd_interval_none(c);
 681                 return;
 682         }
 683         c->empty = 0;
 684         c->min = mul(a->min, b->min);
 685         c->openmin = (a->openmin || b->openmin);
 686         c->max = mul(a->max,  b->max);
 687         c->openmax = (a->openmax || b->openmax);
 688         c->integer = (a->integer && b->integer);
 689 }
 690
 691 /**
 692  * snd_interval_div - refine the interval value with division
 693  * @a: dividend
 694  * @b: divisor
 695  * @c: quotient
 696  *
 697  * c = a / b
 698  *
 699  * Returns non-zero if the value is changed, zero if not changed.
 700  */
 701 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 702 {
 703         unsigned int r;
 704         if (a->empty || b->empty) {
 705                 snd_interval_none(c);
 706                 return;
 707         }
 708         c->empty = 0;
 709         c->min = div32(a->min, b->max, &r);
 710         c->openmin = (r || a->openmin || b->openmax);
 711         if (b->min > 0) {
 712                 c->max = div32(a->max, b->min, &r);
 713                 if (r) {
 714                         c->max++;
 715                         c->openmax = 1;
 716                 } else
 717                         c->openmax = (a->openmax || b->openmin);
 718         } else {
 719                 c->max = UINT_MAX;
 720                 c->openmax = 0;
 721         }
 722         c->integer = 0;
 723 }
 724
 725 /**
 726  * snd_interval_muldivk - refine the interval value
 727  * @a: dividend 1
 728  * @b: dividend 2
 729  * @k: divisor (as integer)
 730  * @c: result
 731   *
 732  * c = a * b / k
 733  *
 734  * Returns non-zero if the value is changed, zero if not changed.
 735  */
 736 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 737                       unsigned int k, struct snd_interval *c)
 738 {
 739         unsigned int r;
 740         if (a->empty || b->empty) {
 741                 snd_interval_none(c);
 742                 return;
 743         }
 744         c->empty = 0;
 745         c->min = muldiv32(a->min, b->min, k, &r);
 746         c->openmin = (r || a->openmin || b->openmin);
 747         c->max = muldiv32(a->max, b->max, k, &r);
 748         if (r) {
 749                 c->max++;
 750                 c->openmax = 1;
 751         } else
 752                 c->openmax = (a->openmax || b->openmax);
 753         c->integer = 0;
 754 }
 755
 756 /**
 757  * snd_interval_mulkdiv - refine the interval value
 758  * @a: dividend 1
 759  * @k: dividend 2 (as integer)
 760  * @b: divisor
 761  * @c: result
 762  *
 763  * c = a * k / b
 764  *
 765  * Returns non-zero if the value is changed, zero if not changed.
 766  */
 767 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 768                       const struct snd_interval *b, struct snd_interval *c)
 769 {
 770         unsigned int r;
 771         if (a->empty || b->empty) {
 772                 snd_interval_none(c);
 773                 return;
 774         }
 775         c->empty = 0;
 776         c->min = muldiv32(a->min, k, b->max, &r);
 777         c->openmin = (r || a->openmin || b->openmax);
 778         if (b->min > 0) {
 779                 c->max = muldiv32(a->max, k, b->min, &r);
 780                 if (r) {
 781                         c->max++;
 782                         c->openmax = 1;
 783                 } else
 784                         c->openmax = (a->openmax || b->openmin);
 785         } else {
 786                 c->max = UINT_MAX;
 787                 c->openmax = 0;
 788         }
 789         c->integer = 0;
 790 }
 791
 792 /* ---- */
 793
 794
 795 /**
 796  * snd_interval_ratnum - refine the interval value
 797  * @i: interval to refine
 798  * @rats_count: number of ratnum_t
 799  * @rats: ratnum_t array
 800  * @nump: pointer to store the resultant numerator
 801  * @denp: pointer to store the resultant denominator
 802  *
 803  * Returns non-zero if the value is changed, zero if not changed.
 804  */
 805 int snd_interval_ratnum(struct snd_interval *i,
 806                         unsigned int rats_count, struct snd_ratnum *rats,
 807                         unsigned int *nump, unsigned int *denp)
 808 {
 809         unsigned int best_num, best_den;
 810         int best_diff;
 811         unsigned int k;
 812         struct snd_interval t;
 813         int err;
 814         unsigned int result_num, result_den;
 815         int result_diff;
 816
 817         best_num = best_den = best_diff = 0;
 818         for (k = 0; k < rats_count; ++k) {
 819                 unsigned int num = rats[k].num;
 820                 unsigned int den;
 821                 unsigned int q = i->min;
 822                 int diff;
 823                 if (q == 0)
 824                         q = 1;
 825                 den = div_up(num, q);
 826                 if (den < rats[k].den_min)
 827                         continue;
 828                 if (den > rats[k].den_max)
 829                         den = rats[k].den_max;
 830                 else {
 831                         unsigned int r;
 832                         r = (den - rats[k].den_min) % rats[k].den_step;
 833                         if (r != 0)
 834                                 den -= r;
 835                 }
 836                 diff = num - q * den;
 837                 if (diff < 0)
 838                         diff = -diff;
 839                 if (best_num == 0 ||
 840                     diff * best_den < best_diff * den) {
 841                         best_diff = diff;
 842                         best_den = den;
 843                         best_num = num;
 844                 }
 845         }
 846         if (best_den == 0) {
 847                 i->empty = 1;
 848                 return -EINVAL;
 849         }
 850         t.min = div_down(best_num, best_den);
 851         t.openmin = !!(best_num % best_den);
 852
 853         result_num = best_num;
 854         result_diff = best_diff;
 855         result_den = best_den;
 856         best_num = best_den = best_diff = 0;
 857         for (k = 0; k < rats_count; ++k) {
 858                 unsigned int num = rats[k].num;
 859                 unsigned int den;
 860                 unsigned int q = i->max;
 861                 int diff;
 862                 if (q == 0) {
 863                         i->empty = 1;
 864                         return -EINVAL;
 865                 }
 866                 den = div_down(num, q);
 867                 if (den > rats[k].den_max)
 868                         continue;
 869                 if (den < rats[k].den_min)
 870                         den = rats[k].den_min;
 871                 else {
 872                         unsigned int r;
 873                         r = (den - rats[k].den_min) % rats[k].den_step;
 874                         if (r != 0)
 875                                 den += rats[k].den_step - r;
 876                 }
 877                 diff = q * den - num;
 878                 if (diff < 0)
 879                         diff = -diff;
 880                 if (best_num == 0 ||
 881                     diff * best_den < best_diff * den) {
 882                         best_diff = diff;
 883                         best_den = den;
 884                         best_num = num;
 885                 }
 886         }
 887         if (best_den == 0) {
 888                 i->empty = 1;
 889                 return -EINVAL;
 890         }
 891         t.max = div_up(best_num, best_den);
 892         t.openmax = !!(best_num % best_den);
 893         t.integer = 0;
 894         err = snd_interval_refine(i, &t);
 895         if (err < 0)
 896                 return err;
 897
 898         if (snd_interval_single(i)) {
 899                 if (best_diff * result_den < result_diff * best_den) {
 900                         result_num = best_num;
 901                         result_den = best_den;
 902                 }
 903                 if (nump)
 904                         *nump = result_num;
 905                 if (denp)
 906                         *denp = result_den;
 907         }
 908         return err;
 909 }
 910
 911 EXPORT_SYMBOL(snd_interval_ratnum);
 912
 913 /**
 914  * snd_interval_ratden - refine the interval value
 915  * @i: interval to refine
 916  * @rats_count: number of struct ratden
 917  * @rats: struct ratden array
 918  * @nump: pointer to store the resultant numerator
 919  * @denp: pointer to store the resultant denominator
 920  *
 921  * Returns non-zero if the value is changed, zero if not changed.
 922  */
 923 static int snd_interval_ratden(struct snd_interval *i,
 924                                unsigned int rats_count, struct snd_ratden *rats,
 925                                unsigned int *nump, unsigned int *denp)
 926 {
 927         unsigned int best_num, best_diff, best_den;
 928         unsigned int k;
 929         struct snd_interval t;
 930         int err;
 931
 932         best_num = best_den = best_diff = 0;
 933         for (k = 0; k < rats_count; ++k) {
 934                 unsigned int num;
 935                 unsigned int den = rats[k].den;
 936                 unsigned int q = i->min;
 937                 int diff;
 938                 num = mul(q, den);
 939                 if (num > rats[k].num_max)
 940                         continue;
 941                 if (num < rats[k].num_min)
 942                         num = rats[k].num_max;
 943                 else {
 944                         unsigned int r;
 945                         r = (num - rats[k].num_min) % rats[k].num_step;
 946                         if (r != 0)
 947                                 num += rats[k].num_step - r;
 948                 }
 949                 diff = num - q * den;
 950                 if (best_num == 0 ||
 951                     diff * best_den < best_diff * den) {
 952                         best_diff = diff;
 953                         best_den = den;
 954                         best_num = num;
 955                 }
 956         }
 957         if (best_den == 0) {
 958                 i->empty = 1;
 959                 return -EINVAL;
 960         }
 961         t.min = div_down(best_num, best_den);
 962         t.openmin = !!(best_num % best_den);
 963
 964         best_num = best_den = best_diff = 0;
 965         for (k = 0; k < rats_count; ++k) {
 966                 unsigned int num;
 967                 unsigned int den = rats[k].den;
 968                 unsigned int q = i->max;
 969                 int diff;
 970                 num = mul(q, den);
 971                 if (num < rats[k].num_min)
 972                         continue;
 973                 if (num > rats[k].num_max)
 974                         num = rats[k].num_max;
 975                 else {
 976                         unsigned int r;
 977                         r = (num - rats[k].num_min) % rats[k].num_step;
 978                         if (r != 0)
 979                                 num -= r;
 980                 }
 981                 diff = q * den - num;
 982                 if (best_num == 0 ||
 983                     diff * best_den < best_diff * den) {
 984                         best_diff = diff;
 985                         best_den = den;
 986                         best_num = num;
 987                 }
 988         }
 989         if (best_den == 0) {
 990                 i->empty = 1;
 991                 return -EINVAL;
 992         }
 993         t.max = div_up(best_num, best_den);
 994         t.openmax = !!(best_num % best_den);
 995         t.integer = 0;
 996         err = snd_interval_refine(i, &t);
 997         if (err < 0)
 998                 return err;
 999
1000         if (snd_interval_single(i)) {
1001                 if (nump)
1002                         *nump = best_num;
1003                 if (denp)
1004                         *denp = best_den;
1005         }
1006         return err;
1007 }
1008
1009 /**
1010  * snd_interval_list - refine the interval value from the list
1011  * @i: the interval value to refine
1012  * @count: the number of elements in the list
1013  * @list: the value list
1014  * @mask: the bit-mask to evaluate
1015  *
1016  * Refines the interval value from the list.
1017  * When mask is non-zero, only the elements corresponding to bit 1 are
1018  * evaluated.
1019  *
1020  * Returns non-zero if the value is changed, zero if not changed.
1021  */
1022 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
1023 {
1024         unsigned int k;
1025         struct snd_interval list_range;
1026
1027         if (!count) {
1028                 i->empty = 1;
1029                 return -EINVAL;
1030         }
1031         snd_interval_any(&list_range);
1032         list_range.min = UINT_MAX;
1033         list_range.max = 0;
1034         for (k = 0; k < count; k++) {
1035                 if (mask && !(mask & (1 << k)))
1036                         continue;
1037                 if (!snd_interval_test(i, list[k]))
1038                         continue;
1039                 list_range.min = min(list_range.min, list[k]);
1040                 list_range.max = max(list_range.max, list[k]);
1041         }
1042         return snd_interval_refine(i, &list_range);
1043 }
1044
1045 EXPORT_SYMBOL(snd_interval_list);
1046
1047 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1048 {
1049         unsigned int n;
1050         int changed = 0;
1051         n = (i->min - min) % step;
1052         if (n != 0 || i->openmin) {
1053                 i->min += step - n;
1054                 changed = 1;
1055         }
1056         n = (i->max - min) % step;
1057         if (n != 0 || i->openmax) {
1058                 i->max -= n;
1059                 changed = 1;
1060         }
1061         if (snd_interval_checkempty(i)) {
1062                 i->empty = 1;
1063                 return -EINVAL;
1064         }
1065         return changed;
1066 }
1067
1068 /* Info constraints helpers */
1069
1070 /**
1071  * snd_pcm_hw_rule_add - add the hw-constraint rule
1072  * @runtime: the pcm runtime instance
1073  * @cond: condition bits
1074  * @var: the variable to evaluate
1075  * @func: the evaluation function
1076  * @private: the private data pointer passed to function
1077  * @dep: the dependent variables
1078  *
1079  * Returns zero if successful, or a negative error code on failure.
1080  */
1081 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1082                         int var,
1083                         snd_pcm_hw_rule_func_t func, void *private,
1084                         int dep, ...)
1085 {
1086         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1087         struct snd_pcm_hw_rule *c;
1088         unsigned int k;
1089         va_list args;
1090         va_start(args, dep);
1091         if (constrs->rules_num >= constrs->rules_all) {
1092                 struct snd_pcm_hw_rule *new;
1093                 unsigned int new_rules = constrs->rules_all + 16;
1094                 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1095                 if (!new) {
1096                         va_end(args);
1097                         return -ENOMEM;
1098                 }
1099                 if (constrs->rules) {
1100                         memcpy(new, constrs->rules,
1101                                constrs->rules_num * sizeof(*c));
1102                         kfree(constrs->rules);
1103                 }
1104                 constrs->rules = new;
1105                 constrs->rules_all = new_rules;
1106         }
1107         c = &constrs->rules[constrs->rules_num];
1108         c->cond = cond;
1109         c->func = func;
1110         c->var = var;
1111         c->private = private;
1112         k = 0;
1113         while (1) {
1114                 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1115                         va_end(args);
1116                         return -EINVAL;
1117                 }
1118                 c->deps[k++] = dep;
1119                 if (dep < 0)
1120                         break;
1121                 dep = va_arg(args, int);
1122         }
1123         constrs->rules_num++;
1124         va_end(args);
1125         return 0;
1126 }
1127
1128 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1129
1130 /**
1131  * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1132  * @runtime: PCM runtime instance
1133  * @var: hw_params variable to apply the mask
1134  * @mask: the bitmap mask
1135  *
1136  * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1137  */
1138 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1139                                u_int32_t mask)
1140 {
1141         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1142         struct snd_mask *maskp = constrs_mask(constrs, var);
1143         *maskp->bits &= mask;
1144         memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1145         if (*maskp->bits == 0)
1146                 return -EINVAL;
1147         return 0;
1148 }
1149
1150 /**
1151  * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1152  * @runtime: PCM runtime instance
1153  * @var: hw_params variable to apply the mask
1154  * @mask: the 64bit bitmap mask
1155  *
1156  * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1157  */
1158 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1159                                  u_int64_t mask)
1160 {
1161         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1162         struct snd_mask *maskp = constrs_mask(constrs, var);
1163         maskp->bits[0] &= (u_int32_t)mask;
1164         maskp->bits[1] &= (u_int32_t)(mask >> 32);
1165         memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1166         if (! maskp->bits[0] && ! maskp->bits[1])
1167                 return -EINVAL;
1168         return 0;
1169 }
1170
1171 /**
1172  * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1173  * @runtime: PCM runtime instance
1174  * @var: hw_params variable to apply the integer constraint
1175  *
1176  * Apply the constraint of integer to an interval parameter.
1177  */
1178 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1179 {
1180         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1181         return snd_interval_setinteger(constrs_interval(constrs, var));
1182 }
1183
1184 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1185
1186 /**
1187  * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1188  * @runtime: PCM runtime instance
1189  * @var: hw_params variable to apply the range
1190  * @min: the minimal value
1191  * @max: the maximal value
1192  *
1193  * Apply the min/max range constraint to an interval parameter.
1194  */
1195 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1196                                  unsigned int min, unsigned int max)
1197 {
1198         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1199         struct snd_interval t;
1200         t.min = min;
1201         t.max = max;
1202         t.openmin = t.openmax = 0;
1203         t.integer = 0;
1204         return snd_interval_refine(constrs_interval(constrs, var), &t);
1205 }
1206
1207 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1208
1209 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1210                                 struct snd_pcm_hw_rule *rule)
1211 {
1212         struct snd_pcm_hw_constraint_list *list = rule->private;
1213         return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1214 }
1215
1216
1217 /**
1218  * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1219  * @runtime: PCM runtime instance
1220  * @cond: condition bits
1221  * @var: hw_params variable to apply the list constraint
1222  * @l: list
1223  *
1224  * Apply the list of constraints to an interval parameter.
1225  */
1226 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1227                                unsigned int cond,
1228                                snd_pcm_hw_param_t var,
1229                                struct snd_pcm_hw_constraint_list *l)
1230 {
1231         return snd_pcm_hw_rule_add(runtime, cond, var,
1232                                    snd_pcm_hw_rule_list, l,
1233                                    var, -1);
1234 }
1235
1236 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1237
1238 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1239                                    struct snd_pcm_hw_rule *rule)
1240 {
1241         struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1242         unsigned int num = 0, den = 0;
1243         int err;
1244         err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1245                                   r->nrats, r->rats, &num, &den);
1246         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1247                 params->rate_num = num;
1248                 params->rate_den = den;
1249         }
1250         return err;
1251 }
1252
1253 /**
1254  * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1255  * @runtime: PCM runtime instance
1256  * @cond: condition bits
1257  * @var: hw_params variable to apply the ratnums constraint
1258  * @r: struct snd_ratnums constriants
1259  */
1260 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1261                                   unsigned int cond,
1262                                   snd_pcm_hw_param_t var,
1263                                   struct snd_pcm_hw_constraint_ratnums *r)
1264 {
1265         return snd_pcm_hw_rule_add(runtime, cond, var,
1266                                    snd_pcm_hw_rule_ratnums, r,
1267                                    var, -1);
1268 }
1269
1270 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1271
1272 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1273                                    struct snd_pcm_hw_rule *rule)
1274 {
1275         struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1276         unsigned int num = 0, den = 0;
1277         int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1278                                   r->nrats, r->rats, &num, &den);
1279         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1280                 params->rate_num = num;
1281                 params->rate_den = den;
1282         }
1283         return err;
1284 }
1285
1286 /**
1287  * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1288  * @runtime: PCM runtime instance
1289  * @cond: condition bits
1290  * @var: hw_params variable to apply the ratdens constraint
1291  * @r: struct snd_ratdens constriants
1292  */
1293 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1294                                   unsigned int cond,
1295                                   snd_pcm_hw_param_t var,
1296                                   struct snd_pcm_hw_constraint_ratdens *r)
1297 {
1298         return snd_pcm_hw_rule_add(runtime, cond, var,
1299                                    snd_pcm_hw_rule_ratdens, r,
1300                                    var, -1);
1301 }
1302
1303 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1304
1305 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1306                                   struct snd_pcm_hw_rule *rule)
1307 {
1308         unsigned int l = (unsigned long) rule->private;
1309         int width = l & 0xffff;
1310         unsigned int msbits = l >> 16;
1311         struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1312         if (snd_interval_single(i) && snd_interval_value(i) == width)
1313                 params->msbits = msbits;
1314         return 0;
1315 }
1316
1317 /**
1318  * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1319  * @runtime: PCM runtime instance
1320  * @cond: condition bits
1321  * @width: sample bits width
1322  * @msbits: msbits width
1323  */
1324 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1325                                  unsigned int cond,
1326                                  unsigned int width,
1327                                  unsigned int msbits)
1328 {
1329         unsigned long l = (msbits << 16) | width;
1330         return snd_pcm_hw_rule_add(runtime, cond, -1,
1331                                     snd_pcm_hw_rule_msbits,
1332                                     (void*) l,
1333                                     SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1334 }
1335
1336 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1337
1338 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1339                                 struct snd_pcm_hw_rule *rule)
1340 {
1341         unsigned long step = (unsigned long) rule->private;
1342         return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1343 }
1344
1345 /**
1346  * snd_pcm_hw_constraint_step - add a hw constraint step rule
1347  * @runtime: PCM runtime instance
1348  * @cond: condition bits
1349  * @var: hw_params variable to apply the step constraint
1350  * @step: step size
1351  */
1352 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1353                                unsigned int cond,
1354                                snd_pcm_hw_param_t var,
1355                                unsigned long step)
1356 {
1357         return snd_pcm_hw_rule_add(runtime, cond, var,
1358                                    snd_pcm_hw_rule_step, (void *) step,
1359                                    var, -1);
1360 }
1361
1362 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1363
1364 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1365 {
1366         static unsigned int pow2_sizes[] = {
1367                 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1368                 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1369                 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1370                 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1371         };
1372         return snd_interval_list(hw_param_interval(params, rule->var),
1373                                  ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1374 }
1375
1376 /**
1377  * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1378  * @runtime: PCM runtime instance
1379  * @cond: condition bits
1380  * @var: hw_params variable to apply the power-of-2 constraint
1381  */
1382 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1383                                unsigned int cond,
1384                                snd_pcm_hw_param_t var)
1385 {
1386         return snd_pcm_hw_rule_add(runtime, cond, var,
1387                                    snd_pcm_hw_rule_pow2, NULL,
1388                                    var, -1);
1389 }
1390
1391 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1392
1393 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1394                                   snd_pcm_hw_param_t var)
1395 {
1396         if (hw_is_mask(var)) {
1397                 snd_mask_any(hw_param_mask(params, var));
1398                 params->cmask |= 1 << var;
1399                 params->rmask |= 1 << var;
1400                 return;
1401         }
1402         if (hw_is_interval(var)) {
1403                 snd_interval_any(hw_param_interval(params, var));
1404                 params->cmask |= 1 << var;
1405                 params->rmask |= 1 << var;
1406                 return;
1407         }
1408         snd_BUG();
1409 }
1410
1411 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1412 {
1413         unsigned int k;
1414         memset(params, 0, sizeof(*params));
1415         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1416                 _snd_pcm_hw_param_any(params, k);
1417         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1418                 _snd_pcm_hw_param_any(params, k);
1419         params->info = ~0U;
1420 }
1421
1422 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1423
1424 /**
1425  * snd_pcm_hw_param_value - return @params field @var value
1426  * @params: the hw_params instance
1427  * @var: parameter to retrieve
1428  * @dir: pointer to the direction (-1,0,1) or %NULL
1429  *
1430  * Return the value for field @var if it's fixed in configuration space
1431  * defined by @params. Return -%EINVAL otherwise.
1432  */
1433 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1434                            snd_pcm_hw_param_t var, int *dir)
1435 {
1436         if (hw_is_mask(var)) {
1437                 const struct snd_mask *mask = hw_param_mask_c(params, var);
1438                 if (!snd_mask_single(mask))
1439                         return -EINVAL;
1440                 if (dir)
1441                         *dir = 0;
1442                 return snd_mask_value(mask);
1443         }
1444         if (hw_is_interval(var)) {
1445                 const struct snd_interval *i = hw_param_interval_c(params, var);
1446                 if (!snd_interval_single(i))
1447                         return -EINVAL;
1448                 if (dir)
1449                         *dir = i->openmin;
1450                 return snd_interval_value(i);
1451         }
1452         return -EINVAL;
1453 }
1454
1455 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1456
1457 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1458                                 snd_pcm_hw_param_t var)
1459 {
1460         if (hw_is_mask(var)) {
1461                 snd_mask_none(hw_param_mask(params, var));
1462                 params->cmask |= 1 << var;
1463                 params->rmask |= 1 << var;
1464         } else if (hw_is_interval(var)) {
1465                 snd_interval_none(hw_param_interval(params, var));
1466                 params->cmask |= 1 << var;
1467                 params->rmask |= 1 << var;
1468         } else {
1469                 snd_BUG();
1470         }
1471 }
1472
1473 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1474
1475 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1476                                    snd_pcm_hw_param_t var)
1477 {
1478         int changed;
1479         if (hw_is_mask(var))
1480                 changed = snd_mask_refine_first(hw_param_mask(params, var));
1481         else if (hw_is_interval(var))
1482                 changed = snd_interval_refine_first(hw_param_interval(params, var));
1483         else
1484                 return -EINVAL;
1485         if (changed) {
1486                 params->cmask |= 1 << var;
1487                 params->rmask |= 1 << var;
1488         }
1489         return changed;
1490 }
1491
1492
1493 /**
1494  * snd_pcm_hw_param_first - refine config space and return minimum value
1495  * @pcm: PCM instance
1496  * @params: the hw_params instance
1497  * @var: parameter to retrieve
1498  * @dir: pointer to the direction (-1,0,1) or %NULL
1499  *
1500  * Inside configuration space defined by @params remove from @var all
1501  * values > minimum. Reduce configuration space accordingly.
1502  * Return the minimum.
1503  */
1504 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1505                            struct snd_pcm_hw_params *params,
1506                            snd_pcm_hw_param_t var, int *dir)
1507 {
1508         int changed = _snd_pcm_hw_param_first(params, var);
1509         if (changed < 0)
1510                 return changed;
1511         if (params->rmask) {
1512                 int err = snd_pcm_hw_refine(pcm, params);
1513                 if (snd_BUG_ON(err < 0))
1514                         return err;
1515         }
1516         return snd_pcm_hw_param_value(params, var, dir);
1517 }
1518
1519 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1520
1521 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1522                                   snd_pcm_hw_param_t var)
1523 {
1524         int changed;
1525         if (hw_is_mask(var))
1526                 changed = snd_mask_refine_last(hw_param_mask(params, var));
1527         else if (hw_is_interval(var))
1528                 changed = snd_interval_refine_last(hw_param_interval(params, var));
1529         else
1530                 return -EINVAL;
1531         if (changed) {
1532                 params->cmask |= 1 << var;
1533                 params->rmask |= 1 << var;
1534         }
1535         return changed;
1536 }
1537
1538
1539 /**
1540  * snd_pcm_hw_param_last - refine config space and return maximum value
1541  * @pcm: PCM instance
1542  * @params: the hw_params instance
1543  * @var: parameter to retrieve
1544  * @dir: pointer to the direction (-1,0,1) or %NULL
1545  *
1546  * Inside configuration space defined by @params remove from @var all
1547  * values < maximum. Reduce configuration space accordingly.
1548  * Return the maximum.
1549  */
1550 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1551                           struct snd_pcm_hw_params *params,
1552                           snd_pcm_hw_param_t var, int *dir)
1553 {
1554         int changed = _snd_pcm_hw_param_last(params, var);
1555         if (changed < 0)
1556                 return changed;
1557         if (params->rmask) {
1558                 int err = snd_pcm_hw_refine(pcm, params);
1559                 if (snd_BUG_ON(err < 0))
1560                         return err;
1561         }
1562         return snd_pcm_hw_param_value(params, var, dir);
1563 }
1564
1565 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1566
1567 /**
1568  * snd_pcm_hw_param_choose - choose a configuration defined by @params
1569  * @pcm: PCM instance
1570  * @params: the hw_params instance
1571  *
1572  * Choose one configuration from configuration space defined by @params.
1573  * The configuration chosen is that obtained fixing in this order:
1574  * first access, first format, first subformat, min channels,
1575  * min rate, min period time, max buffer size, min tick time
1576  */
1577 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1578                              struct snd_pcm_hw_params *params)
1579 {
1580         static int vars[] = {
1581                 SNDRV_PCM_HW_PARAM_ACCESS,
1582                 SNDRV_PCM_HW_PARAM_FORMAT,
1583                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1584                 SNDRV_PCM_HW_PARAM_CHANNELS,
1585                 SNDRV_PCM_HW_PARAM_RATE,
1586                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1587                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1588                 SNDRV_PCM_HW_PARAM_TICK_TIME,
1589                 -1
1590         };
1591         int err, *v;
1592
1593         for (v = vars; *v != -1; v++) {
1594                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1595                         err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1596                 else
1597                         err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1598                 if (snd_BUG_ON(err < 0))
1599                         return err;
1600         }
1601         return 0;
1602 }
1603
1604 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1605                                    void *arg)
1606 {
1607         struct snd_pcm_runtime *runtime = substream->runtime;
1608         unsigned long flags;
1609         snd_pcm_stream_lock_irqsave(substream, flags);
1610         if (snd_pcm_running(substream) &&
1611             snd_pcm_update_hw_ptr(substream) >= 0)
1612                 runtime->status->hw_ptr %= runtime->buffer_size;
1613         else
1614                 runtime->status->hw_ptr = 0;
1615         snd_pcm_stream_unlock_irqrestore(substream, flags);
1616         return 0;
1617 }
1618
1619 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1620                                           void *arg)
1621 {
1622         struct snd_pcm_channel_info *info = arg;
1623         struct snd_pcm_runtime *runtime = substream->runtime;
1624         int width;
1625         if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1626                 info->offset = -1;
1627                 return 0;
1628         }
1629         width = snd_pcm_format_physical_width(runtime->format);
1630         if (width < 0)
1631                 return width;
1632         info->offset = 0;
1633         switch (runtime->access) {
1634         case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1635         case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1636                 info->first = info->channel * width;
1637                 info->step = runtime->channels * width;
1638                 break;
1639         case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1640         case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1641         {
1642                 size_t size = runtime->dma_bytes / runtime->channels;
1643                 info->first = info->channel * size * 8;
1644                 info->step = width;
1645                 break;
1646         }
1647         default:
1648                 snd_BUG();
1649                 break;
1650         }
1651         return 0;
1652 }
1653
1654 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1655                                        void *arg)
1656 {
1657         struct snd_pcm_hw_params *params = arg;
1658         snd_pcm_format_t format;
1659         int channels, width;
1660
1661         params->fifo_size = substream->runtime->hw.fifo_size;
1662         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1663                 format = params_format(params);
1664                 channels = params_channels(params);
1665                 width = snd_pcm_format_physical_width(format);
1666                 params->fifo_size /= width * channels;
1667         }
1668         return 0;
1669 }
1670
1671 /**
1672  * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1673  * @substream: the pcm substream instance
1674  * @cmd: ioctl command
1675  * @arg: ioctl argument
1676  *
1677  * Processes the generic ioctl commands for PCM.
1678  * Can be passed as the ioctl callback for PCM ops.
1679  *
1680  * Returns zero if successful, or a negative error code on failure.
1681  */
1682 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1683                       unsigned int cmd, void *arg)
1684 {
1685         switch (cmd) {
1686         case SNDRV_PCM_IOCTL1_INFO:
1687                 return 0;
1688         case SNDRV_PCM_IOCTL1_RESET:
1689                 return snd_pcm_lib_ioctl_reset(substream, arg);
1690         case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1691                 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1692         case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1693                 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1694         }
1695         return -ENXIO;
1696 }
1697
1698 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1699
1700 /**
1701  * snd_pcm_period_elapsed - update the pcm status for the next period
1702  * @substream: the pcm substream instance
1703  *
1704  * This function is called from the interrupt handler when the
1705  * PCM has processed the period size.  It will update the current
1706  * pointer, wake up sleepers, etc.
1707  *
1708  * Even if more than one periods have elapsed since the last call, you
1709  * have to call this only once.
1710  */
1711 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1712 {
1713         struct snd_pcm_runtime *runtime;
1714         unsigned long flags;
1715
1716         if (PCM_RUNTIME_CHECK(substream))
1717                 return;
1718         runtime = substream->runtime;
1719
1720         if (runtime->transfer_ack_begin)
1721                 runtime->transfer_ack_begin(substream);
1722
1723         snd_pcm_stream_lock_irqsave(substream, flags);
1724         if (!snd_pcm_running(substream) ||
1725             snd_pcm_update_hw_ptr0(substream, 1) < 0)
1726                 goto _end;
1727
1728         if (substream->timer_running)
1729                 snd_timer_interrupt(substream->timer, 1);
1730  _end:
1731         snd_pcm_stream_unlock_irqrestore(substream, flags);
1732         if (runtime->transfer_ack_end)
1733                 runtime->transfer_ack_end(substream);
1734         kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1735 }
1736
1737 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1738
1739 /*
1740  * Wait until avail_min data becomes available
1741  * Returns a negative error code if any error occurs during operation.
1742  * The available space is stored on availp.  When err = 0 and avail = 0
1743  * on the capture stream, it indicates the stream is in DRAINING state.
1744  */
1745 static int wait_for_avail(struct snd_pcm_substream *substream,
1746                               snd_pcm_uframes_t *availp)
1747 {
1748         struct snd_pcm_runtime *runtime = substream->runtime;
1749         int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1750         wait_queue_t wait;
1751         int err = 0;
1752         snd_pcm_uframes_t avail = 0;
1753         long tout;
1754
1755         init_waitqueue_entry(&wait, current);
1756         add_wait_queue(&runtime->tsleep, &wait);
1757         for (;;) {
1758                 if (signal_pending(current)) {
1759                         err = -ERESTARTSYS;
1760                         break;
1761                 }
1762                 set_current_state(TASK_INTERRUPTIBLE);
1763                 snd_pcm_stream_unlock_irq(substream);
1764                 tout = schedule_timeout(msecs_to_jiffies(10000));
1765                 snd_pcm_stream_lock_irq(substream);
1766                 switch (runtime->status->state) {
1767                 case SNDRV_PCM_STATE_SUSPENDED:
1768                         err = -ESTRPIPE;
1769                         goto _endloop;
1770                 case SNDRV_PCM_STATE_XRUN:
1771                         err = -EPIPE;
1772                         goto _endloop;
1773                 case SNDRV_PCM_STATE_DRAINING:
1774                         if (is_playback)
1775                                 err = -EPIPE;
1776                         else
1777                                 avail = 0; /* indicate draining */
1778                         goto _endloop;
1779                 case SNDRV_PCM_STATE_OPEN:
1780                 case SNDRV_PCM_STATE_SETUP:
1781                 case SNDRV_PCM_STATE_DISCONNECTED:
1782                         err = -EBADFD;
1783                         goto _endloop;
1784                 }
1785                 if (!tout) {
1786                         snd_printd("%s write error (DMA or IRQ trouble?)\n",
1787                                    is_playback ? "playback" : "capture");
1788                         err = -EIO;
1789                         break;
1790                 }
1791                 if (is_playback)
1792                         avail = snd_pcm_playback_avail(runtime);
1793                 else
1794                         avail = snd_pcm_capture_avail(runtime);
1795                 if (avail >= runtime->twake)
1796                         break;
1797         }
1798  _endloop:
1799         remove_wait_queue(&runtime->tsleep, &wait);
1800         *availp = avail;
1801         return err;
1802 }
1803
1804 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1805                                       unsigned int hwoff,
1806                                       unsigned long data, unsigned int off,
1807                                       snd_pcm_uframes_t frames)
1808 {
1809         struct snd_pcm_runtime *runtime = substream->runtime;
1810         int err;
1811         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1812         if (substream->ops->copy) {
1813                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1814                         return err;
1815         } else {
1816                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1817                 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1818                         return -EFAULT;
1819         }
1820         return 0;
1821 }
1822
1823 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1824                           unsigned long data, unsigned int off,
1825                           snd_pcm_uframes_t size);
1826
1827 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1828                                             unsigned long data,
1829                                             snd_pcm_uframes_t size,
1830                                             int nonblock,
1831                                             transfer_f transfer)
1832 {
1833         struct snd_pcm_runtime *runtime = substream->runtime;
1834         snd_pcm_uframes_t xfer = 0;
1835         snd_pcm_uframes_t offset = 0;
1836         int err = 0;
1837
1838         if (size == 0)
1839                 return 0;
1840
1841         snd_pcm_stream_lock_irq(substream);
1842         switch (runtime->status->state) {
1843         case SNDRV_PCM_STATE_PREPARED:
1844         case SNDRV_PCM_STATE_RUNNING:
1845         case SNDRV_PCM_STATE_PAUSED:
1846                 break;
1847         case SNDRV_PCM_STATE_XRUN:
1848                 err = -EPIPE;
1849                 goto _end_unlock;
1850         case SNDRV_PCM_STATE_SUSPENDED:
1851                 err = -ESTRPIPE;
1852                 goto _end_unlock;
1853         default:
1854                 err = -EBADFD;
1855                 goto _end_unlock;
1856         }
1857
1858         runtime->twake = runtime->control->avail_min ? : 1;
1859         while (size > 0) {
1860                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1861                 snd_pcm_uframes_t avail;
1862                 snd_pcm_uframes_t cont;
1863                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1864                         snd_pcm_update_hw_ptr(substream);
1865                 avail = snd_pcm_playback_avail(runtime);
1866                 if (!avail) {
1867                         if (nonblock) {
1868                                 err = -EAGAIN;
1869                                 goto _end_unlock;
1870                         }
1871                         runtime->twake = min_t(snd_pcm_uframes_t, size,
1872                                         runtime->control->avail_min ? : 1);
1873                         err = wait_for_avail(substream, &avail);
1874                         if (err < 0)
1875                                 goto _end_unlock;
1876                 }
1877                 frames = size > avail ? avail : size;
1878                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1879                 if (frames > cont)
1880                         frames = cont;
1881                 if (snd_BUG_ON(!frames)) {
1882                         runtime->twake = 0;
1883                         snd_pcm_stream_unlock_irq(substream);
1884                         return -EINVAL;
1885                 }
1886                 appl_ptr = runtime->control->appl_ptr;
1887                 appl_ofs = appl_ptr % runtime->buffer_size;
1888                 snd_pcm_stream_unlock_irq(substream);
1889                 err = transfer(substream, appl_ofs, data, offset, frames);
1890                 snd_pcm_stream_lock_irq(substream);
1891                 if (err < 0)
1892                         goto _end_unlock;
1893                 switch (runtime->status->state) {
1894                 case SNDRV_PCM_STATE_XRUN:
1895                         err = -EPIPE;
1896                         goto _end_unlock;
1897                 case SNDRV_PCM_STATE_SUSPENDED:
1898                         err = -ESTRPIPE;
1899                         goto _end_unlock;
1900                 default:
1901                         break;
1902                 }
1903                 appl_ptr += frames;
1904                 if (appl_ptr >= runtime->boundary)
1905                         appl_ptr -= runtime->boundary;
1906                 runtime->control->appl_ptr = appl_ptr;
1907                 if (substream->ops->ack)
1908                         substream->ops->ack(substream);
1909
1910                 offset += frames;
1911                 size -= frames;
1912                 xfer += frames;
1913                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1914                     snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1915                         err = snd_pcm_start(substream);
1916                         if (err < 0)
1917                                 goto _end_unlock;
1918                 }
1919         }
1920  _end_unlock:
1921         runtime->twake = 0;
1922         if (xfer > 0 && err >= 0)
1923                 snd_pcm_update_state(substream, runtime);
1924         snd_pcm_stream_unlock_irq(substream);
1925         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1926 }
1927
1928 /* sanity-check for read/write methods */
1929 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1930 {
1931         struct snd_pcm_runtime *runtime;
1932         if (PCM_RUNTIME_CHECK(substream))
1933                 return -ENXIO;
1934         runtime = substream->runtime;
1935         if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1936                 return -EINVAL;
1937         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1938                 return -EBADFD;
1939         return 0;
1940 }
1941
1942 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1943 {
1944         struct snd_pcm_runtime *runtime;
1945         int nonblock;
1946         int err;
1947
1948         err = pcm_sanity_check(substream);
1949         if (err < 0)
1950                 return err;
1951         runtime = substream->runtime;
1952         nonblock = !!(substream->f_flags & O_NONBLOCK);
1953
1954         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1955             runtime->channels > 1)
1956                 return -EINVAL;
1957         return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1958                                   snd_pcm_lib_write_transfer);
1959 }
1960
1961 EXPORT_SYMBOL(snd_pcm_lib_write);
1962
1963 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1964                                        unsigned int hwoff,
1965                                        unsigned long data, unsigned int off,
1966                                        snd_pcm_uframes_t frames)
1967 {
1968         struct snd_pcm_runtime *runtime = substream->runtime;
1969         int err;
1970         void __user **bufs = (void __user **)data;
1971         int channels = runtime->channels;
1972         int c;
1973         if (substream->ops->copy) {
1974                 if (snd_BUG_ON(!substream->ops->silence))
1975                         return -EINVAL;
1976                 for (c = 0; c < channels; ++c, ++bufs) {
1977                         if (*bufs == NULL) {
1978                                 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1979                                         return err;
1980                         } else {
1981                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1982                                 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1983                                         return err;
1984                         }
1985                 }
1986         } else {
1987                 /* default transfer behaviour */
1988                 size_t dma_csize = runtime->dma_bytes / channels;
1989                 for (c = 0; c < channels; ++c, ++bufs) {
1990                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1991                         if (*bufs == NULL) {
1992                                 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1993                         } else {
1994                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1995                                 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1996                                         return -EFAULT;
1997                         }
1998                 }
1999         }
2000         return 0;
2001 }
2002
2003 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2004                                      void __user **bufs,
2005                                      snd_pcm_uframes_t frames)
2006 {
2007         struct snd_pcm_runtime *runtime;
2008         int nonblock;
2009         int err;
2010
2011         err = pcm_sanity_check(substream);
2012         if (err < 0)
2013                 return err;
2014         runtime = substream->runtime;
2015         nonblock = !!(substream->f_flags & O_NONBLOCK);
2016
2017         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2018                 return -EINVAL;
2019         return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2020                                   nonblock, snd_pcm_lib_writev_transfer);
2021 }
2022
2023 EXPORT_SYMBOL(snd_pcm_lib_writev);
2024
2025 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2026                                      unsigned int hwoff,
2027                                      unsigned long data, unsigned int off,
2028                                      snd_pcm_uframes_t frames)
2029 {
2030         struct snd_pcm_runtime *runtime = substream->runtime;
2031         int err;
2032         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2033         if (substream->ops->copy) {
2034                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2035                         return err;
2036         } else {
2037                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2038                 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2039                         return -EFAULT;
2040         }
2041         return 0;
2042 }
2043
2044 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2045                                            unsigned long data,
2046                                            snd_pcm_uframes_t size,
2047                                            int nonblock,
2048                                            transfer_f transfer)
2049 {
2050         struct snd_pcm_runtime *runtime = substream->runtime;
2051         snd_pcm_uframes_t xfer = 0;
2052         snd_pcm_uframes_t offset = 0;
2053         int err = 0;
2054
2055         if (size == 0)
2056                 return 0;
2057
2058         snd_pcm_stream_lock_irq(substream);
2059         switch (runtime->status->state) {
2060         case SNDRV_PCM_STATE_PREPARED:
2061                 if (size >= runtime->start_threshold) {
2062                         err = snd_pcm_start(substream);
2063                         if (err < 0)
2064                                 goto _end_unlock;
2065                 }
2066                 break;
2067         case SNDRV_PCM_STATE_DRAINING:
2068         case SNDRV_PCM_STATE_RUNNING:
2069         case SNDRV_PCM_STATE_PAUSED:
2070                 break;
2071         case SNDRV_PCM_STATE_XRUN:
2072                 err = -EPIPE;
2073                 goto _end_unlock;
2074         case SNDRV_PCM_STATE_SUSPENDED:
2075                 err = -ESTRPIPE;
2076                 goto _end_unlock;
2077         default:
2078                 err = -EBADFD;
2079                 goto _end_unlock;
2080         }
2081
2082         runtime->twake = runtime->control->avail_min ? : 1;
2083         while (size > 0) {
2084                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2085                 snd_pcm_uframes_t avail;
2086                 snd_pcm_uframes_t cont;
2087                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2088                         snd_pcm_update_hw_ptr(substream);
2089                 avail = snd_pcm_capture_avail(runtime);
2090                 if (!avail) {
2091                         if (runtime->status->state ==
2092                             SNDRV_PCM_STATE_DRAINING) {
2093                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2094                                 goto _end_unlock;
2095                         }
2096                         if (nonblock) {
2097                                 err = -EAGAIN;
2098                                 goto _end_unlock;
2099                         }
2100                         runtime->twake = min_t(snd_pcm_uframes_t, size,
2101                                         runtime->control->avail_min ? : 1);
2102                         err = wait_for_avail(substream, &avail);
2103                         if (err < 0)
2104                                 goto _end_unlock;
2105                         if (!avail)
2106                                 continue; /* draining */
2107                 }
2108                 frames = size > avail ? avail : size;
2109                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2110                 if (frames > cont)
2111                         frames = cont;
2112                 if (snd_BUG_ON(!frames)) {
2113                         runtime->twake = 0;
2114                         snd_pcm_stream_unlock_irq(substream);
2115                         return -EINVAL;
2116                 }
2117                 appl_ptr = runtime->control->appl_ptr;
2118                 appl_ofs = appl_ptr % runtime->buffer_size;
2119                 snd_pcm_stream_unlock_irq(substream);
2120                 err = transfer(substream, appl_ofs, data, offset, frames);
2121                 snd_pcm_stream_lock_irq(substream);
2122                 if (err < 0)
2123                         goto _end_unlock;
2124                 switch (runtime->status->state) {
2125                 case SNDRV_PCM_STATE_XRUN:
2126                         err = -EPIPE;
2127                         goto _end_unlock;
2128                 case SNDRV_PCM_STATE_SUSPENDED:
2129                         err = -ESTRPIPE;
2130                         goto _end_unlock;
2131                 default:
2132                         break;
2133                 }
2134                 appl_ptr += frames;
2135                 if (appl_ptr >= runtime->boundary)
2136                         appl_ptr -= runtime->boundary;
2137                 runtime->control->appl_ptr = appl_ptr;
2138                 if (substream->ops->ack)
2139                         substream->ops->ack(substream);
2140
2141                 offset += frames;
2142                 size -= frames;
2143                 xfer += frames;
2144         }
2145  _end_unlock:
2146         runtime->twake = 0;
2147         if (xfer > 0 && err >= 0)
2148                 snd_pcm_update_state(substream, runtime);
2149         snd_pcm_stream_unlock_irq(substream);
2150         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2151 }
2152
2153 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2154 {
2155         struct snd_pcm_runtime *runtime;
2156         int nonblock;
2157         int err;
2158
2159         err = pcm_sanity_check(substream);
2160         if (err < 0)
2161                 return err;
2162         runtime = substream->runtime;
2163         nonblock = !!(substream->f_flags & O_NONBLOCK);
2164         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2165                 return -EINVAL;
2166         return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2167 }
2168
2169 EXPORT_SYMBOL(snd_pcm_lib_read);
2170
2171 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2172                                       unsigned int hwoff,
2173                                       unsigned long data, unsigned int off,
2174                                       snd_pcm_uframes_t frames)
2175 {
2176         struct snd_pcm_runtime *runtime = substream->runtime;
2177         int err;
2178         void __user **bufs = (void __user **)data;
2179         int channels = runtime->channels;
2180         int c;
2181         if (substream->ops->copy) {
2182                 for (c = 0; c < channels; ++c, ++bufs) {
2183                         char __user *buf;
2184                         if (*bufs == NULL)
2185                                 continue;
2186                         buf = *bufs + samples_to_bytes(runtime, off);
2187                         if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2188                                 return err;
2189                 }
2190         } else {
2191                 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2192                 for (c = 0; c < channels; ++c, ++bufs) {
2193                         char *hwbuf;
2194                         char __user *buf;
2195                         if (*bufs == NULL)
2196                                 continue;
2197
2198                         hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2199                         buf = *bufs + samples_to_bytes(runtime, off);
2200                         if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2201                                 return -EFAULT;
2202                 }
2203         }
2204         return 0;
2205 }
2206
2207 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2208                                     void __user **bufs,
2209                                     snd_pcm_uframes_t frames)
2210 {
2211         struct snd_pcm_runtime *runtime;
2212         int nonblock;
2213         int err;
2214
2215         err = pcm_sanity_check(substream);
2216         if (err < 0)
2217                 return err;
2218         runtime = substream->runtime;
2219         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2220                 return -EBADFD;
2221
2222         nonblock = !!(substream->f_flags & O_NONBLOCK);
2223         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2224                 return -EINVAL;
2225         return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2226 }
2227
2228 EXPORT_SYMBOL(snd_pcm_lib_readv);