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 <linux/export.h>
  27 #include <sound/core.h>
  28 #include <sound/control.h>
  29 #include <sound/info.h>
  30 #include <sound/pcm.h>
  31 #include <sound/pcm_params.h>
  32 #include <sound/timer.h>
  33
  34 /*
  35  * fill ring buffer with silence
  36  * runtime->silence_start: starting pointer to silence area
  37  * runtime->silence_filled: size filled with silence
  38  * runtime->silence_threshold: threshold from application
  39  * runtime->silence_size: maximal size from application
  40  *
  41  * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
  42  */
  43 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
  44 {
  45         struct snd_pcm_runtime *runtime = substream->runtime;
  46         snd_pcm_uframes_t frames, ofs, transfer;
  47
  48         if (runtime->silence_size < runtime->boundary) {
  49                 snd_pcm_sframes_t noise_dist, n;
  50                 if (runtime->silence_start != runtime->control->appl_ptr) {
  51                         n = runtime->control->appl_ptr - runtime->silence_start;
  52                         if (n < 0)
  53                                 n += runtime->boundary;
  54                         if ((snd_pcm_uframes_t)n < runtime->silence_filled)
  55                                 runtime->silence_filled -= n;
  56                         else
  57                                 runtime->silence_filled = 0;
  58                         runtime->silence_start = runtime->control->appl_ptr;
  59                 }
  60                 if (runtime->silence_filled >= runtime->buffer_size)
  61                         return;
  62                 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
  63                 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
  64                         return;
  65                 frames = runtime->silence_threshold - noise_dist;
  66                 if (frames > runtime->silence_size)
  67                         frames = runtime->silence_size;
  68         } else {
  69                 if (new_hw_ptr == ULONG_MAX) {  /* initialization */
  70                         snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
  71                         if (avail > runtime->buffer_size)
  72                                 avail = runtime->buffer_size;
  73                         runtime->silence_filled = avail > 0 ? avail : 0;
  74                         runtime->silence_start = (runtime->status->hw_ptr +
  75                                                   runtime->silence_filled) %
  76                                                  runtime->boundary;
  77                 } else {
  78                         ofs = runtime->status->hw_ptr;
  79                         frames = new_hw_ptr - ofs;
  80                         if ((snd_pcm_sframes_t)frames < 0)
  81                                 frames += runtime->boundary;
  82                         runtime->silence_filled -= frames;
  83                         if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
  84                                 runtime->silence_filled = 0;
  85                                 runtime->silence_start = new_hw_ptr;
  86                         } else {
  87                                 runtime->silence_start = ofs;
  88                         }
  89                 }
  90                 frames = runtime->buffer_size - runtime->silence_filled;
  91         }
  92         if (snd_BUG_ON(frames > runtime->buffer_size))
  93                 return;
  94         if (frames == 0)
  95                 return;
  96         ofs = runtime->silence_start % runtime->buffer_size;
  97         while (frames > 0) {
  98                 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
  99                 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
 100                     runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
 101                         if (substream->ops->silence) {
 102                                 int err;
 103                                 err = substream->ops->silence(substream, -1, ofs, transfer);
 104                                 snd_BUG_ON(err < 0);
 105                         } else {
 106                                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
 107                                 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
 108                         }
 109                 } else {
 110                         unsigned int c;
 111                         unsigned int channels = runtime->channels;
 112                         if (substream->ops->silence) {
 113                                 for (c = 0; c < channels; ++c) {
 114                                         int err;
 115                                         err = substream->ops->silence(substream, c, ofs, transfer);
 116                                         snd_BUG_ON(err < 0);
 117                                 }
 118                         } else {
 119                                 size_t dma_csize = runtime->dma_bytes / channels;
 120                                 for (c = 0; c < channels; ++c) {
 121                                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
 122                                         snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
 123                                 }
 124                         }
 125                 }
 126                 runtime->silence_filled += transfer;
 127                 frames -= transfer;
 128                 ofs = 0;
 129         }
 130 }
 131
 132 #ifdef CONFIG_SND_DEBUG
 133 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
 134                            char *name, size_t len)
 135 {
 136         snprintf(name, len, "pcmC%dD%d%c:%d",
 137                  substream->pcm->card->number,
 138                  substream->pcm->device,
 139                  substream->stream ? 'c' : 'p',
 140                  substream->number);
 141 }
 142 EXPORT_SYMBOL(snd_pcm_debug_name);
 143 #endif
 144
 145 #define XRUN_DEBUG_BASIC        (1<<0)
 146 #define XRUN_DEBUG_STACK        (1<<1)  /* dump also stack */
 147 #define XRUN_DEBUG_JIFFIESCHECK (1<<2)  /* do jiffies check */
 148 #define XRUN_DEBUG_PERIODUPDATE (1<<3)  /* full period update info */
 149 #define XRUN_DEBUG_HWPTRUPDATE  (1<<4)  /* full hwptr update info */
 150 #define XRUN_DEBUG_LOG          (1<<5)  /* show last 10 positions on err */
 151 #define XRUN_DEBUG_LOGONCE      (1<<6)  /* do above only once */
 152
 153 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 154
 155 #define xrun_debug(substream, mask) \
 156                         ((substream)->pstr->xrun_debug & (mask))
 157 #else
 158 #define xrun_debug(substream, mask)     0
 159 #endif
 160
 161 #define dump_stack_on_xrun(substream) do {                      \
 162                 if (xrun_debug(substream, XRUN_DEBUG_STACK))    \
 163                         dump_stack();                           \
 164         } while (0)
 165
 166 static void xrun(struct snd_pcm_substream *substream)
 167 {
 168         struct snd_pcm_runtime *runtime = substream->runtime;
 169
 170         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 171                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 172         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 173         if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
 174                 char name[16];
 175                 snd_pcm_debug_name(substream, name, sizeof(name));
 176                 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
 177                 dump_stack_on_xrun(substream);
 178         }
 179 }
 180
 181 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 182 #define hw_ptr_error(substream, fmt, args...)                           \
 183         do {                                                            \
 184                 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {          \
 185                         xrun_log_show(substream);                       \
 186                         if (printk_ratelimit()) {                       \
 187                                 snd_printd("PCM: " fmt, ##args);        \
 188                         }                                               \
 189                         dump_stack_on_xrun(substream);                  \
 190                 }                                                       \
 191         } while (0)
 192
 193 #define XRUN_LOG_CNT    10
 194
 195 struct hwptr_log_entry {
 196         unsigned int in_interrupt;
 197         unsigned long jiffies;
 198         snd_pcm_uframes_t pos;
 199         snd_pcm_uframes_t period_size;
 200         snd_pcm_uframes_t buffer_size;
 201         snd_pcm_uframes_t old_hw_ptr;
 202         snd_pcm_uframes_t hw_ptr_base;
 203 };
 204
 205 struct snd_pcm_hwptr_log {
 206         unsigned int idx;
 207         unsigned int hit: 1;
 208         struct hwptr_log_entry entries[XRUN_LOG_CNT];
 209 };
 210
 211 static void xrun_log(struct snd_pcm_substream *substream,
 212                      snd_pcm_uframes_t pos, int in_interrupt)
 213 {
 214         struct snd_pcm_runtime *runtime = substream->runtime;
 215         struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
 216         struct hwptr_log_entry *entry;
 217
 218         if (log == NULL) {
 219                 log = kzalloc(sizeof(*log), GFP_ATOMIC);
 220                 if (log == NULL)
 221                         return;
 222                 runtime->hwptr_log = log;
 223         } else {
 224                 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
 225                         return;
 226         }
 227         entry = &log->entries[log->idx];
 228         entry->in_interrupt = in_interrupt;
 229         entry->jiffies = jiffies;
 230         entry->pos = pos;
 231         entry->period_size = runtime->period_size;
 232         entry->buffer_size = runtime->buffer_size;
 233         entry->old_hw_ptr = runtime->status->hw_ptr;
 234         entry->hw_ptr_base = runtime->hw_ptr_base;
 235         log->idx = (log->idx + 1) % XRUN_LOG_CNT;
 236 }
 237
 238 static void xrun_log_show(struct snd_pcm_substream *substream)
 239 {
 240         struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
 241         struct hwptr_log_entry *entry;
 242         char name[16];
 243         unsigned int idx;
 244         int cnt;
 245
 246         if (log == NULL)
 247                 return;
 248         if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
 249                 return;
 250         snd_pcm_debug_name(substream, name, sizeof(name));
 251         for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
 252                 entry = &log->entries[idx];
 253                 if (entry->period_size == 0)
 254                         break;
 255                 snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
 256                            "hwptr=%ld/%ld\n",
 257                            name, entry->in_interrupt ? "[Q] " : "",
 258                            entry->jiffies,
 259                            (unsigned long)entry->pos,
 260                            (unsigned long)entry->period_size,
 261                            (unsigned long)entry->buffer_size,
 262                            (unsigned long)entry->old_hw_ptr,
 263                            (unsigned long)entry->hw_ptr_base);
 264                 idx++;
 265                 idx %= XRUN_LOG_CNT;
 266         }
 267         log->hit = 1;
 268 }
 269
 270 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
 271
 272 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
 273 #define xrun_log(substream, pos, in_interrupt)  do { } while (0)
 274 #define xrun_log_show(substream)        do { } while (0)
 275
 276 #endif
 277
 278 int snd_pcm_update_state(struct snd_pcm_substream *substream,
 279                          struct snd_pcm_runtime *runtime)
 280 {
 281         snd_pcm_uframes_t avail;
 282
 283         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 284                 avail = snd_pcm_playback_avail(runtime);
 285         else
 286                 avail = snd_pcm_capture_avail(runtime);
 287         if (avail > runtime->avail_max)
 288                 runtime->avail_max = avail;
 289         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 290                 if (avail >= runtime->buffer_size) {
 291                         snd_pcm_drain_done(substream);
 292                         return -EPIPE;
 293                 }
 294         } else {
 295                 if (avail >= runtime->stop_threshold) {
 296                         xrun(substream);
 297                         return -EPIPE;
 298                 }
 299         }
 300         if (runtime->twake) {
 301                 if (avail >= runtime->twake)
 302                         wake_up(&runtime->tsleep);
 303         } else if (avail >= runtime->control->avail_min)
 304                 wake_up(&runtime->sleep);
 305         return 0;
 306 }
 307
 308 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
 309                                   unsigned int in_interrupt)
 310 {
 311         struct snd_pcm_runtime *runtime = substream->runtime;
 312         snd_pcm_uframes_t pos;
 313         snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
 314         snd_pcm_sframes_t hdelta, delta;
 315         unsigned long jdelta;
 316
 317         old_hw_ptr = runtime->status->hw_ptr;
 318         pos = substream->ops->pointer(substream);
 319         if (pos == SNDRV_PCM_POS_XRUN) {
 320                 xrun(substream);
 321                 return -EPIPE;
 322         }
 323         if (pos >= runtime->buffer_size) {
 324                 if (printk_ratelimit()) {
 325                         char name[16];
 326                         snd_pcm_debug_name(substream, name, sizeof(name));
 327                         xrun_log_show(substream);
 328                         snd_printd(KERN_ERR  "BUG: %s, pos = %ld, "
 329                                    "buffer size = %ld, period size = %ld\n",
 330                                    name, pos, runtime->buffer_size,
 331                                    runtime->period_size);
 332                 }
 333                 pos = 0;
 334         }
 335         pos -= pos % runtime->min_align;
 336         if (xrun_debug(substream, XRUN_DEBUG_LOG))
 337                 xrun_log(substream, pos, in_interrupt);
 338         hw_base = runtime->hw_ptr_base;
 339         new_hw_ptr = hw_base + pos;
 340         if (in_interrupt) {
 341                 /* we know that one period was processed */
 342                 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
 343                 delta = runtime->hw_ptr_interrupt + runtime->period_size;
 344                 if (delta > new_hw_ptr) {
 345                         /* check for double acknowledged interrupts */
 346                         hdelta = jiffies - runtime->hw_ptr_jiffies;
 347                         if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
 348                                 hw_base += runtime->buffer_size;
 349                                 if (hw_base >= runtime->boundary)
 350                                         hw_base = 0;
 351                                 new_hw_ptr = hw_base + pos;
 352                                 goto __delta;
 353                         }
 354                 }
 355         }
 356         /* new_hw_ptr might be lower than old_hw_ptr in case when */
 357         /* pointer crosses the end of the ring buffer */
 358         if (new_hw_ptr < old_hw_ptr) {
 359                 hw_base += runtime->buffer_size;
 360                 if (hw_base >= runtime->boundary)
 361                         hw_base = 0;
 362                 new_hw_ptr = hw_base + pos;
 363         }
 364       __delta:
 365         delta = new_hw_ptr - old_hw_ptr;
 366         if (delta < 0)
 367                 delta += runtime->boundary;
 368         if (xrun_debug(substream, in_interrupt ?
 369                         XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
 370                 char name[16];
 371                 snd_pcm_debug_name(substream, name, sizeof(name));
 372                 snd_printd("%s_update: %s: pos=%u/%u/%u, "
 373                            "hwptr=%ld/%ld/%ld/%ld\n",
 374                            in_interrupt ? "period" : "hwptr",
 375                            name,
 376                            (unsigned int)pos,
 377                            (unsigned int)runtime->period_size,
 378                            (unsigned int)runtime->buffer_size,
 379                            (unsigned long)delta,
 380                            (unsigned long)old_hw_ptr,
 381                            (unsigned long)new_hw_ptr,
 382                            (unsigned long)runtime->hw_ptr_base);
 383         }
 384
 385         if (runtime->no_period_wakeup) {
 386                 snd_pcm_sframes_t xrun_threshold;
 387                 /*
 388                  * Without regular period interrupts, we have to check
 389                  * the elapsed time to detect xruns.
 390                  */
 391                 jdelta = jiffies - runtime->hw_ptr_jiffies;
 392                 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
 393                         goto no_delta_check;
 394                 hdelta = jdelta - delta * HZ / runtime->rate;
 395                 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
 396                 while (hdelta > xrun_threshold) {
 397                         delta += runtime->buffer_size;
 398                         hw_base += runtime->buffer_size;
 399                         if (hw_base >= runtime->boundary)
 400                                 hw_base = 0;
 401                         new_hw_ptr = hw_base + pos;
 402                         hdelta -= runtime->hw_ptr_buffer_jiffies;
 403                 }
 404                 goto no_delta_check;
 405         }
 406
 407         /* something must be really wrong */
 408         if (delta >= runtime->buffer_size + runtime->period_size) {
 409                 hw_ptr_error(substream,
 410                                "Unexpected hw_pointer value %s"
 411                                "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
 412                                "old_hw_ptr=%ld)\n",
 413                                      in_interrupt ? "[Q] " : "[P]",
 414                                      substream->stream, (long)pos,
 415                                      (long)new_hw_ptr, (long)old_hw_ptr);
 416                 return 0;
 417         }
 418
 419         /* Do jiffies check only in xrun_debug mode */
 420         if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
 421                 goto no_jiffies_check;
 422
 423         /* Skip the jiffies check for hardwares with BATCH flag.
 424          * Such hardware usually just increases the position at each IRQ,
 425          * thus it can't give any strange position.
 426          */
 427         if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
 428                 goto no_jiffies_check;
 429         hdelta = delta;
 430         if (hdelta < runtime->delay)
 431                 goto no_jiffies_check;
 432         hdelta -= runtime->delay;
 433         jdelta = jiffies - runtime->hw_ptr_jiffies;
 434         if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
 435                 delta = jdelta /
 436                         (((runtime->period_size * HZ) / runtime->rate)
 437                                                                 + HZ/100);
 438                 /* move new_hw_ptr according jiffies not pos variable */
 439                 new_hw_ptr = old_hw_ptr;
 440                 hw_base = delta;
 441                 /* use loop to avoid checks for delta overflows */
 442                 /* the delta value is small or zero in most cases */
 443                 while (delta > 0) {
 444                         new_hw_ptr += runtime->period_size;
 445                         if (new_hw_ptr >= runtime->boundary)
 446                                 new_hw_ptr -= runtime->boundary;
 447                         delta--;
 448                 }
 449                 /* align hw_base to buffer_size */
 450                 hw_ptr_error(substream,
 451                              "hw_ptr skipping! %s"
 452                              "(pos=%ld, delta=%ld, period=%ld, "
 453                              "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
 454                              in_interrupt ? "[Q] " : "",
 455                              (long)pos, (long)hdelta,
 456                              (long)runtime->period_size, jdelta,
 457                              ((hdelta * HZ) / runtime->rate), hw_base,
 458                              (unsigned long)old_hw_ptr,
 459                              (unsigned long)new_hw_ptr);
 460                 /* reset values to proper state */
 461                 delta = 0;
 462                 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
 463         }
 464  no_jiffies_check:
 465         if (delta > runtime->period_size + runtime->period_size / 2) {
 466                 hw_ptr_error(substream,
 467                              "Lost interrupts? %s"
 468                              "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
 469                              "old_hw_ptr=%ld)\n",
 470                              in_interrupt ? "[Q] " : "",
 471                              substream->stream, (long)delta,
 472                              (long)new_hw_ptr,
 473                              (long)old_hw_ptr);
 474         }
 475
 476  no_delta_check:
 477         if (runtime->status->hw_ptr == new_hw_ptr)
 478                 return 0;
 479
 480         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 481             runtime->silence_size > 0)
 482                 snd_pcm_playback_silence(substream, new_hw_ptr);
 483
 484         if (in_interrupt) {
 485                 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
 486                 if (delta < 0)
 487                         delta += runtime->boundary;
 488                 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
 489                 runtime->hw_ptr_interrupt += delta;
 490                 if (runtime->hw_ptr_interrupt >= runtime->boundary)
 491                         runtime->hw_ptr_interrupt -= runtime->boundary;
 492         }
 493         runtime->hw_ptr_base = hw_base;
 494         runtime->status->hw_ptr = new_hw_ptr;
 495         runtime->hw_ptr_jiffies = jiffies;
 496         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 497                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 498
 499         return snd_pcm_update_state(substream, runtime);
 500 }
 501
 502 /* CAUTION: call it with irq disabled */
 503 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 504 {
 505         return snd_pcm_update_hw_ptr0(substream, 0);
 506 }
 507
 508 /**
 509  * snd_pcm_set_ops - set the PCM operators
 510  * @pcm: the pcm instance
 511  * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 512  * @ops: the operator table
 513  *
 514  * Sets the given PCM operators to the pcm instance.
 515  */
 516 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
 517 {
 518         struct snd_pcm_str *stream = &pcm->streams[direction];
 519         struct snd_pcm_substream *substream;
 520
 521         for (substream = stream->substream; substream != NULL; substream = substream->next)
 522                 substream->ops = ops;
 523 }
 524
 525 EXPORT_SYMBOL(snd_pcm_set_ops);
 526
 527 /**
 528  * snd_pcm_sync - set the PCM sync id
 529  * @substream: the pcm substream
 530  *
 531  * Sets the PCM sync identifier for the card.
 532  */
 533 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
 534 {
 535         struct snd_pcm_runtime *runtime = substream->runtime;
 536
 537         runtime->sync.id32[0] = substream->pcm->card->number;
 538         runtime->sync.id32[1] = -1;
 539         runtime->sync.id32[2] = -1;
 540         runtime->sync.id32[3] = -1;
 541 }
 542
 543 EXPORT_SYMBOL(snd_pcm_set_sync);
 544
 545 /*
 546  *  Standard ioctl routine
 547  */
 548
 549 static inline unsigned int div32(unsigned int a, unsigned int b,
 550                                  unsigned int *r)
 551 {
 552         if (b == 0) {
 553                 *r = 0;
 554                 return UINT_MAX;
 555         }
 556         *r = a % b;
 557         return a / b;
 558 }
 559
 560 static inline unsigned int div_down(unsigned int a, unsigned int b)
 561 {
 562         if (b == 0)
 563                 return UINT_MAX;
 564         return a / b;
 565 }
 566
 567 static inline unsigned int div_up(unsigned int a, unsigned int b)
 568 {
 569         unsigned int r;
 570         unsigned int q;
 571         if (b == 0)
 572                 return UINT_MAX;
 573         q = div32(a, b, &r);
 574         if (r)
 575                 ++q;
 576         return q;
 577 }
 578
 579 static inline unsigned int mul(unsigned int a, unsigned int b)
 580 {
 581         if (a == 0)
 582                 return 0;
 583         if (div_down(UINT_MAX, a) < b)
 584                 return UINT_MAX;
 585         return a * b;
 586 }
 587
 588 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
 589                                     unsigned int c, unsigned int *r)
 590 {
 591         u_int64_t n = (u_int64_t) a * b;
 592         if (c == 0) {
 593                 snd_BUG_ON(!n);
 594                 *r = 0;
 595                 return UINT_MAX;
 596         }
 597         n = div_u64_rem(n, c, r);
 598         if (n >= UINT_MAX) {
 599                 *r = 0;
 600                 return UINT_MAX;
 601         }
 602         return n;
 603 }
 604
 605 /**
 606  * snd_interval_refine - refine the interval value of configurator
 607  * @i: the interval value to refine
 608  * @v: the interval value to refer to
 609  *
 610  * Refines the interval value with the reference value.
 611  * The interval is changed to the range satisfying both intervals.
 612  * The interval status (min, max, integer, etc.) are evaluated.
 613  *
 614  * Returns non-zero if the value is changed, zero if not changed.
 615  */
 616 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
 617 {
 618         int changed = 0;
 619         if (snd_BUG_ON(snd_interval_empty(i)))
 620                 return -EINVAL;
 621         if (i->min < v->min) {
 622                 i->min = v->min;
 623                 i->openmin = v->openmin;
 624                 changed = 1;
 625         } else if (i->min == v->min && !i->openmin && v->openmin) {
 626                 i->openmin = 1;
 627                 changed = 1;
 628         }
 629         if (i->max > v->max) {
 630                 i->max = v->max;
 631                 i->openmax = v->openmax;
 632                 changed = 1;
 633         } else if (i->max == v->max && !i->openmax && v->openmax) {
 634                 i->openmax = 1;
 635                 changed = 1;
 636         }
 637         if (!i->integer && v->integer) {
 638                 i->integer = 1;
 639                 changed = 1;
 640         }
 641         if (i->integer) {
 642                 if (i->openmin) {
 643                         i->min++;
 644                         i->openmin = 0;
 645                 }
 646                 if (i->openmax) {
 647                         i->max--;
 648                         i->openmax = 0;
 649                 }
 650         } else if (!i->openmin && !i->openmax && i->min == i->max)
 651                 i->integer = 1;
 652         if (snd_interval_checkempty(i)) {
 653                 snd_interval_none(i);
 654                 return -EINVAL;
 655         }
 656         return changed;
 657 }
 658
 659 EXPORT_SYMBOL(snd_interval_refine);
 660
 661 static int snd_interval_refine_first(struct snd_interval *i)
 662 {
 663         if (snd_BUG_ON(snd_interval_empty(i)))
 664                 return -EINVAL;
 665         if (snd_interval_single(i))
 666                 return 0;
 667         i->max = i->min;
 668         i->openmax = i->openmin;
 669         if (i->openmax)
 670                 i->max++;
 671         return 1;
 672 }
 673
 674 static int snd_interval_refine_last(struct snd_interval *i)
 675 {
 676         if (snd_BUG_ON(snd_interval_empty(i)))
 677                 return -EINVAL;
 678         if (snd_interval_single(i))
 679                 return 0;
 680         i->min = i->max;
 681         i->openmin = i->openmax;
 682         if (i->openmin)
 683                 i->min--;
 684         return 1;
 685 }
 686
 687 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 688 {
 689         if (a->empty || b->empty) {
 690                 snd_interval_none(c);
 691                 return;
 692         }
 693         c->empty = 0;
 694         c->min = mul(a->min, b->min);
 695         c->openmin = (a->openmin || b->openmin);
 696         c->max = mul(a->max,  b->max);
 697         c->openmax = (a->openmax || b->openmax);
 698         c->integer = (a->integer && b->integer);
 699 }
 700
 701 /**
 702  * snd_interval_div - refine the interval value with division
 703  * @a: dividend
 704  * @b: divisor
 705  * @c: quotient
 706  *
 707  * c = a / b
 708  *
 709  * Returns non-zero if the value is changed, zero if not changed.
 710  */
 711 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 712 {
 713         unsigned int r;
 714         if (a->empty || b->empty) {
 715                 snd_interval_none(c);
 716                 return;
 717         }
 718         c->empty = 0;
 719         c->min = div32(a->min, b->max, &r);
 720         c->openmin = (r || a->openmin || b->openmax);
 721         if (b->min > 0) {
 722                 c->max = div32(a->max, b->min, &r);
 723                 if (r) {
 724                         c->max++;
 725                         c->openmax = 1;
 726                 } else
 727                         c->openmax = (a->openmax || b->openmin);
 728         } else {
 729                 c->max = UINT_MAX;
 730                 c->openmax = 0;
 731         }
 732         c->integer = 0;
 733 }
 734
 735 /**
 736  * snd_interval_muldivk - refine the interval value
 737  * @a: dividend 1
 738  * @b: dividend 2
 739  * @k: divisor (as integer)
 740  * @c: result
 741   *
 742  * c = a * b / k
 743  *
 744  * Returns non-zero if the value is changed, zero if not changed.
 745  */
 746 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 747                       unsigned int k, struct snd_interval *c)
 748 {
 749         unsigned int r;
 750         if (a->empty || b->empty) {
 751                 snd_interval_none(c);
 752                 return;
 753         }
 754         c->empty = 0;
 755         c->min = muldiv32(a->min, b->min, k, &r);
 756         c->openmin = (r || a->openmin || b->openmin);
 757         c->max = muldiv32(a->max, b->max, k, &r);
 758         if (r) {
 759                 c->max++;
 760                 c->openmax = 1;
 761         } else
 762                 c->openmax = (a->openmax || b->openmax);
 763         c->integer = 0;
 764 }
 765
 766 /**
 767  * snd_interval_mulkdiv - refine the interval value
 768  * @a: dividend 1
 769  * @k: dividend 2 (as integer)
 770  * @b: divisor
 771  * @c: result
 772  *
 773  * c = a * k / b
 774  *
 775  * Returns non-zero if the value is changed, zero if not changed.
 776  */
 777 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 778                       const struct snd_interval *b, struct snd_interval *c)
 779 {
 780         unsigned int r;
 781         if (a->empty || b->empty) {
 782                 snd_interval_none(c);
 783                 return;
 784         }
 785         c->empty = 0;
 786         c->min = muldiv32(a->min, k, b->max, &r);
 787         c->openmin = (r || a->openmin || b->openmax);
 788         if (b->min > 0) {
 789                 c->max = muldiv32(a->max, k, b->min, &r);
 790                 if (r) {
 791                         c->max++;
 792                         c->openmax = 1;
 793                 } else
 794                         c->openmax = (a->openmax || b->openmin);
 795         } else {
 796                 c->max = UINT_MAX;
 797                 c->openmax = 0;
 798         }
 799         c->integer = 0;
 800 }
 801
 802 /* ---- */
 803
 804
 805 /**
 806  * snd_interval_ratnum - refine the interval value
 807  * @i: interval to refine
 808  * @rats_count: number of ratnum_t
 809  * @rats: ratnum_t array
 810  * @nump: pointer to store the resultant numerator
 811  * @denp: pointer to store the resultant denominator
 812  *
 813  * Returns non-zero if the value is changed, zero if not changed.
 814  */
 815 int snd_interval_ratnum(struct snd_interval *i,
 816                         unsigned int rats_count, struct snd_ratnum *rats,
 817                         unsigned int *nump, unsigned int *denp)
 818 {
 819         unsigned int best_num, best_den;
 820         int best_diff;
 821         unsigned int k;
 822         struct snd_interval t;
 823         int err;
 824         unsigned int result_num, result_den;
 825         int result_diff;
 826
 827         best_num = best_den = best_diff = 0;
 828         for (k = 0; k < rats_count; ++k) {
 829                 unsigned int num = rats[k].num;
 830                 unsigned int den;
 831                 unsigned int q = i->min;
 832                 int diff;
 833                 if (q == 0)
 834                         q = 1;
 835                 den = div_up(num, q);
 836                 if (den < rats[k].den_min)
 837                         continue;
 838                 if (den > rats[k].den_max)
 839                         den = rats[k].den_max;
 840                 else {
 841                         unsigned int r;
 842                         r = (den - rats[k].den_min) % rats[k].den_step;
 843                         if (r != 0)
 844                                 den -= r;
 845                 }
 846                 diff = num - q * den;
 847                 if (diff < 0)
 848                         diff = -diff;
 849                 if (best_num == 0 ||
 850                     diff * best_den < best_diff * den) {
 851                         best_diff = diff;
 852                         best_den = den;
 853                         best_num = num;
 854                 }
 855         }
 856         if (best_den == 0) {
 857                 i->empty = 1;
 858                 return -EINVAL;
 859         }
 860         t.min = div_down(best_num, best_den);
 861         t.openmin = !!(best_num % best_den);
 862
 863         result_num = best_num;
 864         result_diff = best_diff;
 865         result_den = best_den;
 866         best_num = best_den = best_diff = 0;
 867         for (k = 0; k < rats_count; ++k) {
 868                 unsigned int num = rats[k].num;
 869                 unsigned int den;
 870                 unsigned int q = i->max;
 871                 int diff;
 872                 if (q == 0) {
 873                         i->empty = 1;
 874                         return -EINVAL;
 875                 }
 876                 den = div_down(num, q);
 877                 if (den > rats[k].den_max)
 878                         continue;
 879                 if (den < rats[k].den_min)
 880                         den = rats[k].den_min;
 881                 else {
 882                         unsigned int r;
 883                         r = (den - rats[k].den_min) % rats[k].den_step;
 884                         if (r != 0)
 885                                 den += rats[k].den_step - r;
 886                 }
 887                 diff = q * den - num;
 888                 if (diff < 0)
 889                         diff = -diff;
 890                 if (best_num == 0 ||
 891                     diff * best_den < best_diff * den) {
 892                         best_diff = diff;
 893                         best_den = den;
 894                         best_num = num;
 895                 }
 896         }
 897         if (best_den == 0) {
 898                 i->empty = 1;
 899                 return -EINVAL;
 900         }
 901         t.max = div_up(best_num, best_den);
 902         t.openmax = !!(best_num % best_den);
 903         t.integer = 0;
 904         err = snd_interval_refine(i, &t);
 905         if (err < 0)
 906                 return err;
 907
 908         if (snd_interval_single(i)) {
 909                 if (best_diff * result_den < result_diff * best_den) {
 910                         result_num = best_num;
 911                         result_den = best_den;
 912                 }
 913                 if (nump)
 914                         *nump = result_num;
 915                 if (denp)
 916                         *denp = result_den;
 917         }
 918         return err;
 919 }
 920
 921 EXPORT_SYMBOL(snd_interval_ratnum);
 922
 923 /**
 924  * snd_interval_ratden - refine the interval value
 925  * @i: interval to refine
 926  * @rats_count: number of struct ratden
 927  * @rats: struct ratden array
 928  * @nump: pointer to store the resultant numerator
 929  * @denp: pointer to store the resultant denominator
 930  *
 931  * Returns non-zero if the value is changed, zero if not changed.
 932  */
 933 static int snd_interval_ratden(struct snd_interval *i,
 934                                unsigned int rats_count, struct snd_ratden *rats,
 935                                unsigned int *nump, unsigned int *denp)
 936 {
 937         unsigned int best_num, best_diff, best_den;
 938         unsigned int k;
 939         struct snd_interval t;
 940         int err;
 941
 942         best_num = best_den = best_diff = 0;
 943         for (k = 0; k < rats_count; ++k) {
 944                 unsigned int num;
 945                 unsigned int den = rats[k].den;
 946                 unsigned int q = i->min;
 947                 int diff;
 948                 num = mul(q, den);
 949                 if (num > rats[k].num_max)
 950                         continue;
 951                 if (num < rats[k].num_min)
 952                         num = rats[k].num_max;
 953                 else {
 954                         unsigned int r;
 955                         r = (num - rats[k].num_min) % rats[k].num_step;
 956                         if (r != 0)
 957                                 num += rats[k].num_step - r;
 958                 }
 959                 diff = num - q * den;
 960                 if (best_num == 0 ||
 961                     diff * best_den < best_diff * den) {
 962                         best_diff = diff;
 963                         best_den = den;
 964                         best_num = num;
 965                 }
 966         }
 967         if (best_den == 0) {
 968                 i->empty = 1;
 969                 return -EINVAL;
 970         }
 971         t.min = div_down(best_num, best_den);
 972         t.openmin = !!(best_num % best_den);
 973
 974         best_num = best_den = best_diff = 0;
 975         for (k = 0; k < rats_count; ++k) {
 976                 unsigned int num;
 977                 unsigned int den = rats[k].den;
 978                 unsigned int q = i->max;
 979                 int diff;
 980                 num = mul(q, den);
 981                 if (num < rats[k].num_min)
 982                         continue;
 983                 if (num > rats[k].num_max)
 984                         num = rats[k].num_max;
 985                 else {
 986                         unsigned int r;
 987                         r = (num - rats[k].num_min) % rats[k].num_step;
 988                         if (r != 0)
 989                                 num -= r;
 990                 }
 991                 diff = q * den - num;
 992                 if (best_num == 0 ||
 993                     diff * best_den < best_diff * den) {
 994                         best_diff = diff;
 995                         best_den = den;
 996                         best_num = num;
 997                 }
 998         }
 999         if (best_den == 0) {
1000                 i->empty = 1;
1001                 return -EINVAL;
1002         }
1003         t.max = div_up(best_num, best_den);
1004         t.openmax = !!(best_num % best_den);
1005         t.integer = 0;
1006         err = snd_interval_refine(i, &t);
1007         if (err < 0)
1008                 return err;
1009
1010         if (snd_interval_single(i)) {
1011                 if (nump)
1012                         *nump = best_num;
1013                 if (denp)
1014                         *denp = best_den;
1015         }
1016         return err;
1017 }
1018
1019 /**
1020  * snd_interval_list - refine the interval value from the list
1021  * @i: the interval value to refine
1022  * @count: the number of elements in the list
1023  * @list: the value list
1024  * @mask: the bit-mask to evaluate
1025  *
1026  * Refines the interval value from the list.
1027  * When mask is non-zero, only the elements corresponding to bit 1 are
1028  * evaluated.
1029  *
1030  * Returns non-zero if the value is changed, zero if not changed.
1031  */
1032 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
1033 {
1034         unsigned int k;
1035         struct snd_interval list_range;
1036
1037         if (!count) {
1038                 i->empty = 1;
1039                 return -EINVAL;
1040         }
1041         snd_interval_any(&list_range);
1042         list_range.min = UINT_MAX;
1043         list_range.max = 0;
1044         for (k = 0; k < count; k++) {
1045                 if (mask && !(mask & (1 << k)))
1046                         continue;
1047                 if (!snd_interval_test(i, list[k]))
1048                         continue;
1049                 list_range.min = min(list_range.min, list[k]);
1050                 list_range.max = max(list_range.max, list[k]);
1051         }
1052         return snd_interval_refine(i, &list_range);
1053 }
1054
1055 EXPORT_SYMBOL(snd_interval_list);
1056
1057 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1058 {
1059         unsigned int n;
1060         int changed = 0;
1061         n = (i->min - min) % step;
1062         if (n != 0 || i->openmin) {
1063                 i->min += step - n;
1064                 changed = 1;
1065         }
1066         n = (i->max - min) % step;
1067         if (n != 0 || i->openmax) {
1068                 i->max -= n;
1069                 changed = 1;
1070         }
1071         if (snd_interval_checkempty(i)) {
1072                 i->empty = 1;
1073                 return -EINVAL;
1074         }
1075         return changed;
1076 }
1077
1078 /* Info constraints helpers */
1079
1080 /**
1081  * snd_pcm_hw_rule_add - add the hw-constraint rule
1082  * @runtime: the pcm runtime instance
1083  * @cond: condition bits
1084  * @var: the variable to evaluate
1085  * @func: the evaluation function
1086  * @private: the private data pointer passed to function
1087  * @dep: the dependent variables
1088  *
1089  * Returns zero if successful, or a negative error code on failure.
1090  */
1091 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1092                         int var,
1093                         snd_pcm_hw_rule_func_t func, void *private,
1094                         int dep, ...)
1095 {
1096         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1097         struct snd_pcm_hw_rule *c;
1098         unsigned int k;
1099         va_list args;
1100         va_start(args, dep);
1101         if (constrs->rules_num >= constrs->rules_all) {
1102                 struct snd_pcm_hw_rule *new;
1103                 unsigned int new_rules = constrs->rules_all + 16;
1104                 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1105                 if (!new) {
1106                         va_end(args);
1107                         return -ENOMEM;
1108                 }
1109                 if (constrs->rules) {
1110                         memcpy(new, constrs->rules,
1111                                constrs->rules_num * sizeof(*c));
1112                         kfree(constrs->rules);
1113                 }
1114                 constrs->rules = new;
1115                 constrs->rules_all = new_rules;
1116         }
1117         c = &constrs->rules[constrs->rules_num];
1118         c->cond = cond;
1119         c->func = func;
1120         c->var = var;
1121         c->private = private;
1122         k = 0;
1123         while (1) {
1124                 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1125                         va_end(args);
1126                         return -EINVAL;
1127                 }
1128                 c->deps[k++] = dep;
1129                 if (dep < 0)
1130                         break;
1131                 dep = va_arg(args, int);
1132         }
1133         constrs->rules_num++;
1134         va_end(args);
1135         return 0;
1136 }
1137
1138 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1139
1140 /**
1141  * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1142  * @runtime: PCM runtime instance
1143  * @var: hw_params variable to apply the mask
1144  * @mask: the bitmap mask
1145  *
1146  * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1147  */
1148 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1149                                u_int32_t mask)
1150 {
1151         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1152         struct snd_mask *maskp = constrs_mask(constrs, var);
1153         *maskp->bits &= mask;
1154         memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1155         if (*maskp->bits == 0)
1156                 return -EINVAL;
1157         return 0;
1158 }
1159
1160 /**
1161  * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1162  * @runtime: PCM runtime instance
1163  * @var: hw_params variable to apply the mask
1164  * @mask: the 64bit bitmap mask
1165  *
1166  * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1167  */
1168 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1169                                  u_int64_t mask)
1170 {
1171         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1172         struct snd_mask *maskp = constrs_mask(constrs, var);
1173         maskp->bits[0] &= (u_int32_t)mask;
1174         maskp->bits[1] &= (u_int32_t)(mask >> 32);
1175         memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1176         if (! maskp->bits[0] && ! maskp->bits[1])
1177                 return -EINVAL;
1178         return 0;
1179 }
1180
1181 /**
1182  * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1183  * @runtime: PCM runtime instance
1184  * @var: hw_params variable to apply the integer constraint
1185  *
1186  * Apply the constraint of integer to an interval parameter.
1187  */
1188 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1189 {
1190         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1191         return snd_interval_setinteger(constrs_interval(constrs, var));
1192 }
1193
1194 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1195
1196 /**
1197  * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1198  * @runtime: PCM runtime instance
1199  * @var: hw_params variable to apply the range
1200  * @min: the minimal value
1201  * @max: the maximal value
1202  *
1203  * Apply the min/max range constraint to an interval parameter.
1204  */
1205 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1206                                  unsigned int min, unsigned int max)
1207 {
1208         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1209         struct snd_interval t;
1210         t.min = min;
1211         t.max = max;
1212         t.openmin = t.openmax = 0;
1213         t.integer = 0;
1214         return snd_interval_refine(constrs_interval(constrs, var), &t);
1215 }
1216
1217 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1218
1219 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1220                                 struct snd_pcm_hw_rule *rule)
1221 {
1222         struct snd_pcm_hw_constraint_list *list = rule->private;
1223         return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1224 }
1225
1226
1227 /**
1228  * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1229  * @runtime: PCM runtime instance
1230  * @cond: condition bits
1231  * @var: hw_params variable to apply the list constraint
1232  * @l: list
1233  *
1234  * Apply the list of constraints to an interval parameter.
1235  */
1236 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1237                                unsigned int cond,
1238                                snd_pcm_hw_param_t var,
1239                                struct snd_pcm_hw_constraint_list *l)
1240 {
1241         return snd_pcm_hw_rule_add(runtime, cond, var,
1242                                    snd_pcm_hw_rule_list, l,
1243                                    var, -1);
1244 }
1245
1246 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1247
1248 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1249                                    struct snd_pcm_hw_rule *rule)
1250 {
1251         struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1252         unsigned int num = 0, den = 0;
1253         int err;
1254         err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1255                                   r->nrats, r->rats, &num, &den);
1256         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1257                 params->rate_num = num;
1258                 params->rate_den = den;
1259         }
1260         return err;
1261 }
1262
1263 /**
1264  * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1265  * @runtime: PCM runtime instance
1266  * @cond: condition bits
1267  * @var: hw_params variable to apply the ratnums constraint
1268  * @r: struct snd_ratnums constriants
1269  */
1270 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1271                                   unsigned int cond,
1272                                   snd_pcm_hw_param_t var,
1273                                   struct snd_pcm_hw_constraint_ratnums *r)
1274 {
1275         return snd_pcm_hw_rule_add(runtime, cond, var,
1276                                    snd_pcm_hw_rule_ratnums, r,
1277                                    var, -1);
1278 }
1279
1280 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1281
1282 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1283                                    struct snd_pcm_hw_rule *rule)
1284 {
1285         struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1286         unsigned int num = 0, den = 0;
1287         int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1288                                   r->nrats, r->rats, &num, &den);
1289         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1290                 params->rate_num = num;
1291                 params->rate_den = den;
1292         }
1293         return err;
1294 }
1295
1296 /**
1297  * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1298  * @runtime: PCM runtime instance
1299  * @cond: condition bits
1300  * @var: hw_params variable to apply the ratdens constraint
1301  * @r: struct snd_ratdens constriants
1302  */
1303 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1304                                   unsigned int cond,
1305                                   snd_pcm_hw_param_t var,
1306                                   struct snd_pcm_hw_constraint_ratdens *r)
1307 {
1308         return snd_pcm_hw_rule_add(runtime, cond, var,
1309                                    snd_pcm_hw_rule_ratdens, r,
1310                                    var, -1);
1311 }
1312
1313 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1314
1315 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1316                                   struct snd_pcm_hw_rule *rule)
1317 {
1318         unsigned int l = (unsigned long) rule->private;
1319         int width = l & 0xffff;
1320         unsigned int msbits = l >> 16;
1321         struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1322         if (snd_interval_single(i) && snd_interval_value(i) == width)
1323                 params->msbits = msbits;
1324         return 0;
1325 }
1326
1327 /**
1328  * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1329  * @runtime: PCM runtime instance
1330  * @cond: condition bits
1331  * @width: sample bits width
1332  * @msbits: msbits width
1333  */
1334 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1335                                  unsigned int cond,
1336                                  unsigned int width,
1337                                  unsigned int msbits)
1338 {
1339         unsigned long l = (msbits << 16) | width;
1340         return snd_pcm_hw_rule_add(runtime, cond, -1,
1341                                     snd_pcm_hw_rule_msbits,
1342                                     (void*) l,
1343                                     SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1344 }
1345
1346 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1347
1348 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1349                                 struct snd_pcm_hw_rule *rule)
1350 {
1351         unsigned long step = (unsigned long) rule->private;
1352         return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1353 }
1354
1355 /**
1356  * snd_pcm_hw_constraint_step - add a hw constraint step rule
1357  * @runtime: PCM runtime instance
1358  * @cond: condition bits
1359  * @var: hw_params variable to apply the step constraint
1360  * @step: step size
1361  */
1362 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1363                                unsigned int cond,
1364                                snd_pcm_hw_param_t var,
1365                                unsigned long step)
1366 {
1367         return snd_pcm_hw_rule_add(runtime, cond, var,
1368                                    snd_pcm_hw_rule_step, (void *) step,
1369                                    var, -1);
1370 }
1371
1372 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1373
1374 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1375 {
1376         static unsigned int pow2_sizes[] = {
1377                 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1378                 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1379                 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1380                 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1381         };
1382         return snd_interval_list(hw_param_interval(params, rule->var),
1383                                  ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1384 }
1385
1386 /**
1387  * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1388  * @runtime: PCM runtime instance
1389  * @cond: condition bits
1390  * @var: hw_params variable to apply the power-of-2 constraint
1391  */
1392 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1393                                unsigned int cond,
1394                                snd_pcm_hw_param_t var)
1395 {
1396         return snd_pcm_hw_rule_add(runtime, cond, var,
1397                                    snd_pcm_hw_rule_pow2, NULL,
1398                                    var, -1);
1399 }
1400
1401 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1402
1403 static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1404                                            struct snd_pcm_hw_rule *rule)
1405 {
1406         unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1407         struct snd_interval *rate;
1408
1409         rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1410         return snd_interval_list(rate, 1, &base_rate, 0);
1411 }
1412
1413 /**
1414  * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1415  * @runtime: PCM runtime instance
1416  * @base_rate: the rate at which the hardware does not resample
1417  */
1418 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1419                                unsigned int base_rate)
1420 {
1421         return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1422                                    SNDRV_PCM_HW_PARAM_RATE,
1423                                    snd_pcm_hw_rule_noresample_func,
1424                                    (void *)(uintptr_t)base_rate,
1425                                    SNDRV_PCM_HW_PARAM_RATE, -1);
1426 }
1427 EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1428
1429 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1430                                   snd_pcm_hw_param_t var)
1431 {
1432         if (hw_is_mask(var)) {
1433                 snd_mask_any(hw_param_mask(params, var));
1434                 params->cmask |= 1 << var;
1435                 params->rmask |= 1 << var;
1436                 return;
1437         }
1438         if (hw_is_interval(var)) {
1439                 snd_interval_any(hw_param_interval(params, var));
1440                 params->cmask |= 1 << var;
1441                 params->rmask |= 1 << var;
1442                 return;
1443         }
1444         snd_BUG();
1445 }
1446
1447 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1448 {
1449         unsigned int k;
1450         memset(params, 0, sizeof(*params));
1451         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1452                 _snd_pcm_hw_param_any(params, k);
1453         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1454                 _snd_pcm_hw_param_any(params, k);
1455         params->info = ~0U;
1456 }
1457
1458 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1459
1460 /**
1461  * snd_pcm_hw_param_value - return @params field @var value
1462  * @params: the hw_params instance
1463  * @var: parameter to retrieve
1464  * @dir: pointer to the direction (-1,0,1) or %NULL
1465  *
1466  * Return the value for field @var if it's fixed in configuration space
1467  * defined by @params. Return -%EINVAL otherwise.
1468  */
1469 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1470                            snd_pcm_hw_param_t var, int *dir)
1471 {
1472         if (hw_is_mask(var)) {
1473                 const struct snd_mask *mask = hw_param_mask_c(params, var);
1474                 if (!snd_mask_single(mask))
1475                         return -EINVAL;
1476                 if (dir)
1477                         *dir = 0;
1478                 return snd_mask_value(mask);
1479         }
1480         if (hw_is_interval(var)) {
1481                 const struct snd_interval *i = hw_param_interval_c(params, var);
1482                 if (!snd_interval_single(i))
1483                         return -EINVAL;
1484                 if (dir)
1485                         *dir = i->openmin;
1486                 return snd_interval_value(i);
1487         }
1488         return -EINVAL;
1489 }
1490
1491 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1492
1493 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1494                                 snd_pcm_hw_param_t var)
1495 {
1496         if (hw_is_mask(var)) {
1497                 snd_mask_none(hw_param_mask(params, var));
1498                 params->cmask |= 1 << var;
1499                 params->rmask |= 1 << var;
1500         } else if (hw_is_interval(var)) {
1501                 snd_interval_none(hw_param_interval(params, var));
1502                 params->cmask |= 1 << var;
1503                 params->rmask |= 1 << var;
1504         } else {
1505                 snd_BUG();
1506         }
1507 }
1508
1509 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1510
1511 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1512                                    snd_pcm_hw_param_t var)
1513 {
1514         int changed;
1515         if (hw_is_mask(var))
1516                 changed = snd_mask_refine_first(hw_param_mask(params, var));
1517         else if (hw_is_interval(var))
1518                 changed = snd_interval_refine_first(hw_param_interval(params, var));
1519         else
1520                 return -EINVAL;
1521         if (changed) {
1522                 params->cmask |= 1 << var;
1523                 params->rmask |= 1 << var;
1524         }
1525         return changed;
1526 }
1527
1528
1529 /**
1530  * snd_pcm_hw_param_first - refine config space and return minimum value
1531  * @pcm: PCM instance
1532  * @params: the hw_params instance
1533  * @var: parameter to retrieve
1534  * @dir: pointer to the direction (-1,0,1) or %NULL
1535  *
1536  * Inside configuration space defined by @params remove from @var all
1537  * values > minimum. Reduce configuration space accordingly.
1538  * Return the minimum.
1539  */
1540 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1541                            struct snd_pcm_hw_params *params,
1542                            snd_pcm_hw_param_t var, int *dir)
1543 {
1544         int changed = _snd_pcm_hw_param_first(params, var);
1545         if (changed < 0)
1546                 return changed;
1547         if (params->rmask) {
1548                 int err = snd_pcm_hw_refine(pcm, params);
1549                 if (snd_BUG_ON(err < 0))
1550                         return err;
1551         }
1552         return snd_pcm_hw_param_value(params, var, dir);
1553 }
1554
1555 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1556
1557 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1558                                   snd_pcm_hw_param_t var)
1559 {
1560         int changed;
1561         if (hw_is_mask(var))
1562                 changed = snd_mask_refine_last(hw_param_mask(params, var));
1563         else if (hw_is_interval(var))
1564                 changed = snd_interval_refine_last(hw_param_interval(params, var));
1565         else
1566                 return -EINVAL;
1567         if (changed) {
1568                 params->cmask |= 1 << var;
1569                 params->rmask |= 1 << var;
1570         }
1571         return changed;
1572 }
1573
1574
1575 /**
1576  * snd_pcm_hw_param_last - refine config space and return maximum value
1577  * @pcm: PCM instance
1578  * @params: the hw_params instance
1579  * @var: parameter to retrieve
1580  * @dir: pointer to the direction (-1,0,1) or %NULL
1581  *
1582  * Inside configuration space defined by @params remove from @var all
1583  * values < maximum. Reduce configuration space accordingly.
1584  * Return the maximum.
1585  */
1586 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1587                           struct snd_pcm_hw_params *params,
1588                           snd_pcm_hw_param_t var, int *dir)
1589 {
1590         int changed = _snd_pcm_hw_param_last(params, var);
1591         if (changed < 0)
1592                 return changed;
1593         if (params->rmask) {
1594                 int err = snd_pcm_hw_refine(pcm, params);
1595                 if (snd_BUG_ON(err < 0))
1596                         return err;
1597         }
1598         return snd_pcm_hw_param_value(params, var, dir);
1599 }
1600
1601 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1602
1603 /**
1604  * snd_pcm_hw_param_choose - choose a configuration defined by @params
1605  * @pcm: PCM instance
1606  * @params: the hw_params instance
1607  *
1608  * Choose one configuration from configuration space defined by @params.
1609  * The configuration chosen is that obtained fixing in this order:
1610  * first access, first format, first subformat, min channels,
1611  * min rate, min period time, max buffer size, min tick time
1612  */
1613 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1614                              struct snd_pcm_hw_params *params)
1615 {
1616         static int vars[] = {
1617                 SNDRV_PCM_HW_PARAM_ACCESS,
1618                 SNDRV_PCM_HW_PARAM_FORMAT,
1619                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1620                 SNDRV_PCM_HW_PARAM_CHANNELS,
1621                 SNDRV_PCM_HW_PARAM_RATE,
1622                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1623                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1624                 SNDRV_PCM_HW_PARAM_TICK_TIME,
1625                 -1
1626         };
1627         int err, *v;
1628
1629         for (v = vars; *v != -1; v++) {
1630                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1631                         err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1632                 else
1633                         err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1634                 if (snd_BUG_ON(err < 0))
1635                         return err;
1636         }
1637         return 0;
1638 }
1639
1640 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1641                                    void *arg)
1642 {
1643         struct snd_pcm_runtime *runtime = substream->runtime;
1644         unsigned long flags;
1645         snd_pcm_stream_lock_irqsave(substream, flags);
1646         if (snd_pcm_running(substream) &&
1647             snd_pcm_update_hw_ptr(substream) >= 0)
1648                 runtime->status->hw_ptr %= runtime->buffer_size;
1649         else
1650                 runtime->status->hw_ptr = 0;
1651         snd_pcm_stream_unlock_irqrestore(substream, flags);
1652         return 0;
1653 }
1654
1655 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1656                                           void *arg)
1657 {
1658         struct snd_pcm_channel_info *info = arg;
1659         struct snd_pcm_runtime *runtime = substream->runtime;
1660         int width;
1661         if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1662                 info->offset = -1;
1663                 return 0;
1664         }
1665         width = snd_pcm_format_physical_width(runtime->format);
1666         if (width < 0)
1667                 return width;
1668         info->offset = 0;
1669         switch (runtime->access) {
1670         case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1671         case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1672                 info->first = info->channel * width;
1673                 info->step = runtime->channels * width;
1674                 break;
1675         case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1676         case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1677         {
1678                 size_t size = runtime->dma_bytes / runtime->channels;
1679                 info->first = info->channel * size * 8;
1680                 info->step = width;
1681                 break;
1682         }
1683         default:
1684                 snd_BUG();
1685                 break;
1686         }
1687         return 0;
1688 }
1689
1690 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1691                                        void *arg)
1692 {
1693         struct snd_pcm_hw_params *params = arg;
1694         snd_pcm_format_t format;
1695         int channels;
1696         ssize_t frame_size;
1697
1698         params->fifo_size = substream->runtime->hw.fifo_size;
1699         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1700                 format = params_format(params);
1701                 channels = params_channels(params);
1702                 frame_size = snd_pcm_format_size(format, channels);
1703                 if (frame_size > 0)
1704                         params->fifo_size /= (unsigned)frame_size;
1705         }
1706         return 0;
1707 }
1708
1709 /**
1710  * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1711  * @substream: the pcm substream instance
1712  * @cmd: ioctl command
1713  * @arg: ioctl argument
1714  *
1715  * Processes the generic ioctl commands for PCM.
1716  * Can be passed as the ioctl callback for PCM ops.
1717  *
1718  * Returns zero if successful, or a negative error code on failure.
1719  */
1720 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1721                       unsigned int cmd, void *arg)
1722 {
1723         switch (cmd) {
1724         case SNDRV_PCM_IOCTL1_INFO:
1725                 return 0;
1726         case SNDRV_PCM_IOCTL1_RESET:
1727                 return snd_pcm_lib_ioctl_reset(substream, arg);
1728         case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1729                 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1730         case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1731                 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1732         }
1733         return -ENXIO;
1734 }
1735
1736 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1737
1738 /**
1739  * snd_pcm_period_elapsed - update the pcm status for the next period
1740  * @substream: the pcm substream instance
1741  *
1742  * This function is called from the interrupt handler when the
1743  * PCM has processed the period size.  It will update the current
1744  * pointer, wake up sleepers, etc.
1745  *
1746  * Even if more than one periods have elapsed since the last call, you
1747  * have to call this only once.
1748  */
1749 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1750 {
1751         struct snd_pcm_runtime *runtime;
1752         unsigned long flags;
1753
1754         if (PCM_RUNTIME_CHECK(substream))
1755                 return;
1756         runtime = substream->runtime;
1757
1758         if (runtime->transfer_ack_begin)
1759                 runtime->transfer_ack_begin(substream);
1760
1761         snd_pcm_stream_lock_irqsave(substream, flags);
1762         if (!snd_pcm_running(substream) ||
1763             snd_pcm_update_hw_ptr0(substream, 1) < 0)
1764                 goto _end;
1765
1766         if (substream->timer_running)
1767                 snd_timer_interrupt(substream->timer, 1);
1768  _end:
1769         if (runtime->transfer_ack_end)
1770                 runtime->transfer_ack_end(substream);
1771         kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1772         snd_pcm_stream_unlock_irqrestore(substream, flags);
1773 }
1774
1775 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1776
1777 /*
1778  * Wait until avail_min data becomes available
1779  * Returns a negative error code if any error occurs during operation.
1780  * The available space is stored on availp.  When err = 0 and avail = 0
1781  * on the capture stream, it indicates the stream is in DRAINING state.
1782  */
1783 static int wait_for_avail(struct snd_pcm_substream *substream,
1784                               snd_pcm_uframes_t *availp)
1785 {
1786         struct snd_pcm_runtime *runtime = substream->runtime;
1787         int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1788         wait_queue_t wait;
1789         int err = 0;
1790         snd_pcm_uframes_t avail = 0;
1791         long wait_time, tout;
1792
1793         init_waitqueue_entry(&wait, current);
1794         set_current_state(TASK_INTERRUPTIBLE);
1795         add_wait_queue(&runtime->tsleep, &wait);
1796
1797         if (runtime->no_period_wakeup)
1798                 wait_time = MAX_SCHEDULE_TIMEOUT;
1799         else {
1800                 wait_time = 10;
1801                 if (runtime->rate) {
1802                         long t = runtime->period_size * 2 / runtime->rate;
1803                         wait_time = max(t, wait_time);
1804                 }
1805                 wait_time = msecs_to_jiffies(wait_time * 1000);
1806         }
1807
1808         for (;;) {
1809                 if (signal_pending(current)) {
1810                         err = -ERESTARTSYS;
1811                         break;
1812                 }
1813
1814                 /*
1815                  * We need to check if space became available already
1816                  * (and thus the wakeup happened already) first to close
1817                  * the race of space already having become available.
1818                  * This check must happen after been added to the waitqueue
1819                  * and having current state be INTERRUPTIBLE.
1820                  */
1821                 if (is_playback)
1822                         avail = snd_pcm_playback_avail(runtime);
1823                 else
1824                         avail = snd_pcm_capture_avail(runtime);
1825                 if (avail >= runtime->twake)
1826                         break;
1827                 snd_pcm_stream_unlock_irq(substream);
1828
1829                 tout = schedule_timeout(wait_time);
1830
1831                 snd_pcm_stream_lock_irq(substream);
1832                 set_current_state(TASK_INTERRUPTIBLE);
1833                 switch (runtime->status->state) {
1834                 case SNDRV_PCM_STATE_SUSPENDED:
1835                         err = -ESTRPIPE;
1836                         goto _endloop;
1837                 case SNDRV_PCM_STATE_XRUN:
1838                         err = -EPIPE;
1839                         goto _endloop;
1840                 case SNDRV_PCM_STATE_DRAINING:
1841                         if (is_playback)
1842                                 err = -EPIPE;
1843                         else
1844                                 avail = 0; /* indicate draining */
1845                         goto _endloop;
1846                 case SNDRV_PCM_STATE_OPEN:
1847                 case SNDRV_PCM_STATE_SETUP:
1848                 case SNDRV_PCM_STATE_DISCONNECTED:
1849                         err = -EBADFD;
1850                         goto _endloop;
1851                 case SNDRV_PCM_STATE_PAUSED:
1852                         continue;
1853                 }
1854                 if (!tout) {
1855                         snd_printd("%s write error (DMA or IRQ trouble?)\n",
1856                                    is_playback ? "playback" : "capture");
1857                         err = -EIO;
1858                         break;
1859                 }
1860         }
1861  _endloop:
1862         set_current_state(TASK_RUNNING);
1863         remove_wait_queue(&runtime->tsleep, &wait);
1864         *availp = avail;
1865         return err;
1866 }
1867
1868 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1869                                       unsigned int hwoff,
1870                                       unsigned long data, unsigned int off,
1871                                       snd_pcm_uframes_t frames)
1872 {
1873         struct snd_pcm_runtime *runtime = substream->runtime;
1874         int err;
1875         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1876         if (substream->ops->copy) {
1877                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1878                         return err;
1879         } else {
1880                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1881                 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1882                         return -EFAULT;
1883         }
1884         return 0;
1885 }
1886
1887 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1888                           unsigned long data, unsigned int off,
1889                           snd_pcm_uframes_t size);
1890
1891 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1892                                             unsigned long data,
1893                                             snd_pcm_uframes_t size,
1894                                             int nonblock,
1895                                             transfer_f transfer)
1896 {
1897         struct snd_pcm_runtime *runtime = substream->runtime;
1898         snd_pcm_uframes_t xfer = 0;
1899         snd_pcm_uframes_t offset = 0;
1900         int err = 0;
1901
1902         if (size == 0)
1903                 return 0;
1904
1905         snd_pcm_stream_lock_irq(substream);
1906         switch (runtime->status->state) {
1907         case SNDRV_PCM_STATE_PREPARED:
1908         case SNDRV_PCM_STATE_RUNNING:
1909         case SNDRV_PCM_STATE_PAUSED:
1910                 break;
1911         case SNDRV_PCM_STATE_XRUN:
1912                 err = -EPIPE;
1913                 goto _end_unlock;
1914         case SNDRV_PCM_STATE_SUSPENDED:
1915                 err = -ESTRPIPE;
1916                 goto _end_unlock;
1917         default:
1918                 err = -EBADFD;
1919                 goto _end_unlock;
1920         }
1921
1922         runtime->twake = runtime->control->avail_min ? : 1;
1923         while (size > 0) {
1924                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1925                 snd_pcm_uframes_t avail;
1926                 snd_pcm_uframes_t cont;
1927                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1928                         snd_pcm_update_hw_ptr(substream);
1929                 avail = snd_pcm_playback_avail(runtime);
1930                 if (!avail) {
1931                         if (nonblock) {
1932                                 err = -EAGAIN;
1933                                 goto _end_unlock;
1934                         }
1935                         runtime->twake = min_t(snd_pcm_uframes_t, size,
1936                                         runtime->control->avail_min ? : 1);
1937                         err = wait_for_avail(substream, &avail);
1938                         if (err < 0)
1939                                 goto _end_unlock;
1940                 }
1941                 frames = size > avail ? avail : size;
1942                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1943                 if (frames > cont)
1944                         frames = cont;
1945                 if (snd_BUG_ON(!frames)) {
1946                         runtime->twake = 0;
1947                         snd_pcm_stream_unlock_irq(substream);
1948                         return -EINVAL;
1949                 }
1950                 appl_ptr = runtime->control->appl_ptr;
1951                 appl_ofs = appl_ptr % runtime->buffer_size;
1952                 snd_pcm_stream_unlock_irq(substream);
1953                 err = transfer(substream, appl_ofs, data, offset, frames);
1954                 snd_pcm_stream_lock_irq(substream);
1955                 if (err < 0)
1956                         goto _end_unlock;
1957                 switch (runtime->status->state) {
1958                 case SNDRV_PCM_STATE_XRUN:
1959                         err = -EPIPE;
1960                         goto _end_unlock;
1961                 case SNDRV_PCM_STATE_SUSPENDED:
1962                         err = -ESTRPIPE;
1963                         goto _end_unlock;
1964                 default:
1965                         break;
1966                 }
1967                 appl_ptr += frames;
1968                 if (appl_ptr >= runtime->boundary)
1969                         appl_ptr -= runtime->boundary;
1970                 runtime->control->appl_ptr = appl_ptr;
1971                 if (substream->ops->ack)
1972                         substream->ops->ack(substream);
1973
1974                 offset += frames;
1975                 size -= frames;
1976                 xfer += frames;
1977                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1978                     snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1979                         err = snd_pcm_start(substream);
1980                         if (err < 0)
1981                                 goto _end_unlock;
1982                 }
1983         }
1984  _end_unlock:
1985         runtime->twake = 0;
1986         if (xfer > 0 && err >= 0)
1987                 snd_pcm_update_state(substream, runtime);
1988         snd_pcm_stream_unlock_irq(substream);
1989         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1990 }
1991
1992 /* sanity-check for read/write methods */
1993 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1994 {
1995         struct snd_pcm_runtime *runtime;
1996         if (PCM_RUNTIME_CHECK(substream))
1997                 return -ENXIO;
1998         runtime = substream->runtime;
1999         if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
2000                 return -EINVAL;
2001         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2002                 return -EBADFD;
2003         return 0;
2004 }
2005
2006 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
2007 {
2008         struct snd_pcm_runtime *runtime;
2009         int nonblock;
2010         int err;
2011
2012         err = pcm_sanity_check(substream);
2013         if (err < 0)
2014                 return err;
2015         runtime = substream->runtime;
2016         nonblock = !!(substream->f_flags & O_NONBLOCK);
2017
2018         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2019             runtime->channels > 1)
2020                 return -EINVAL;
2021         return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2022                                   snd_pcm_lib_write_transfer);
2023 }
2024
2025 EXPORT_SYMBOL(snd_pcm_lib_write);
2026
2027 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
2028                                        unsigned int hwoff,
2029                                        unsigned long data, unsigned int off,
2030                                        snd_pcm_uframes_t frames)
2031 {
2032         struct snd_pcm_runtime *runtime = substream->runtime;
2033         int err;
2034         void __user **bufs = (void __user **)data;
2035         int channels = runtime->channels;
2036         int c;
2037         if (substream->ops->copy) {
2038                 if (snd_BUG_ON(!substream->ops->silence))
2039                         return -EINVAL;
2040                 for (c = 0; c < channels; ++c, ++bufs) {
2041                         if (*bufs == NULL) {
2042                                 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2043                                         return err;
2044                         } else {
2045                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2046                                 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2047                                         return err;
2048                         }
2049                 }
2050         } else {
2051                 /* default transfer behaviour */
2052                 size_t dma_csize = runtime->dma_bytes / channels;
2053                 for (c = 0; c < channels; ++c, ++bufs) {
2054                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2055                         if (*bufs == NULL) {
2056                                 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2057                         } else {
2058                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2059                                 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2060                                         return -EFAULT;
2061                         }
2062                 }
2063         }
2064         return 0;
2065 }
2066
2067 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2068                                      void __user **bufs,
2069                                      snd_pcm_uframes_t frames)
2070 {
2071         struct snd_pcm_runtime *runtime;
2072         int nonblock;
2073         int err;
2074
2075         err = pcm_sanity_check(substream);
2076         if (err < 0)
2077                 return err;
2078         runtime = substream->runtime;
2079         nonblock = !!(substream->f_flags & O_NONBLOCK);
2080
2081         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2082                 return -EINVAL;
2083         return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2084                                   nonblock, snd_pcm_lib_writev_transfer);
2085 }
2086
2087 EXPORT_SYMBOL(snd_pcm_lib_writev);
2088
2089 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2090                                      unsigned int hwoff,
2091                                      unsigned long data, unsigned int off,
2092                                      snd_pcm_uframes_t frames)
2093 {
2094         struct snd_pcm_runtime *runtime = substream->runtime;
2095         int err;
2096         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2097         if (substream->ops->copy) {
2098                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2099                         return err;
2100         } else {
2101                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2102                 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2103                         return -EFAULT;
2104         }
2105         return 0;
2106 }
2107
2108 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2109                                            unsigned long data,
2110                                            snd_pcm_uframes_t size,
2111                                            int nonblock,
2112                                            transfer_f transfer)
2113 {
2114         struct snd_pcm_runtime *runtime = substream->runtime;
2115         snd_pcm_uframes_t xfer = 0;
2116         snd_pcm_uframes_t offset = 0;
2117         int err = 0;
2118
2119         if (size == 0)
2120                 return 0;
2121
2122         snd_pcm_stream_lock_irq(substream);
2123         switch (runtime->status->state) {
2124         case SNDRV_PCM_STATE_PREPARED:
2125                 if (size >= runtime->start_threshold) {
2126                         err = snd_pcm_start(substream);
2127                         if (err < 0)
2128                                 goto _end_unlock;
2129                 }
2130                 break;
2131         case SNDRV_PCM_STATE_DRAINING:
2132         case SNDRV_PCM_STATE_RUNNING:
2133         case SNDRV_PCM_STATE_PAUSED:
2134                 break;
2135         case SNDRV_PCM_STATE_XRUN:
2136                 err = -EPIPE;
2137                 goto _end_unlock;
2138         case SNDRV_PCM_STATE_SUSPENDED:
2139                 err = -ESTRPIPE;
2140                 goto _end_unlock;
2141         default:
2142                 err = -EBADFD;
2143                 goto _end_unlock;
2144         }
2145
2146         runtime->twake = runtime->control->avail_min ? : 1;
2147         while (size > 0) {
2148                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2149                 snd_pcm_uframes_t avail;
2150                 snd_pcm_uframes_t cont;
2151                 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2152                         snd_pcm_update_hw_ptr(substream);
2153                 avail = snd_pcm_capture_avail(runtime);
2154                 if (!avail) {
2155                         if (runtime->status->state ==
2156                             SNDRV_PCM_STATE_DRAINING) {
2157                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2158                                 goto _end_unlock;
2159                         }
2160                         if (nonblock) {
2161                                 err = -EAGAIN;
2162                                 goto _end_unlock;
2163                         }
2164                         runtime->twake = min_t(snd_pcm_uframes_t, size,
2165                                         runtime->control->avail_min ? : 1);
2166                         err = wait_for_avail(substream, &avail);
2167                         if (err < 0)
2168                                 goto _end_unlock;
2169                         if (!avail)
2170                                 continue; /* draining */
2171                 }
2172                 frames = size > avail ? avail : size;
2173                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2174                 if (frames > cont)
2175                         frames = cont;
2176                 if (snd_BUG_ON(!frames)) {
2177                         runtime->twake = 0;
2178                         snd_pcm_stream_unlock_irq(substream);
2179                         return -EINVAL;
2180                 }
2181                 appl_ptr = runtime->control->appl_ptr;
2182                 appl_ofs = appl_ptr % runtime->buffer_size;
2183                 snd_pcm_stream_unlock_irq(substream);
2184                 err = transfer(substream, appl_ofs, data, offset, frames);
2185                 snd_pcm_stream_lock_irq(substream);
2186                 if (err < 0)
2187                         goto _end_unlock;
2188                 switch (runtime->status->state) {
2189                 case SNDRV_PCM_STATE_XRUN:
2190                         err = -EPIPE;
2191                         goto _end_unlock;
2192                 case SNDRV_PCM_STATE_SUSPENDED:
2193                         err = -ESTRPIPE;
2194                         goto _end_unlock;
2195                 default:
2196                         break;
2197                 }
2198                 appl_ptr += frames;
2199                 if (appl_ptr >= runtime->boundary)
2200                         appl_ptr -= runtime->boundary;
2201                 runtime->control->appl_ptr = appl_ptr;
2202                 if (substream->ops->ack)
2203                         substream->ops->ack(substream);
2204
2205                 offset += frames;
2206                 size -= frames;
2207                 xfer += frames;
2208         }
2209  _end_unlock:
2210         runtime->twake = 0;
2211         if (xfer > 0 && err >= 0)
2212                 snd_pcm_update_state(substream, runtime);
2213         snd_pcm_stream_unlock_irq(substream);
2214         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2215 }
2216
2217 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2218 {
2219         struct snd_pcm_runtime *runtime;
2220         int nonblock;
2221         int err;
2222
2223         err = pcm_sanity_check(substream);
2224         if (err < 0)
2225                 return err;
2226         runtime = substream->runtime;
2227         nonblock = !!(substream->f_flags & O_NONBLOCK);
2228         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2229                 return -EINVAL;
2230         return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2231 }
2232
2233 EXPORT_SYMBOL(snd_pcm_lib_read);
2234
2235 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2236                                       unsigned int hwoff,
2237                                       unsigned long data, unsigned int off,
2238                                       snd_pcm_uframes_t frames)
2239 {
2240         struct snd_pcm_runtime *runtime = substream->runtime;
2241         int err;
2242         void __user **bufs = (void __user **)data;
2243         int channels = runtime->channels;
2244         int c;
2245         if (substream->ops->copy) {
2246                 for (c = 0; c < channels; ++c, ++bufs) {
2247                         char __user *buf;
2248                         if (*bufs == NULL)
2249                                 continue;
2250                         buf = *bufs + samples_to_bytes(runtime, off);
2251                         if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2252                                 return err;
2253                 }
2254         } else {
2255                 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2256                 for (c = 0; c < channels; ++c, ++bufs) {
2257                         char *hwbuf;
2258                         char __user *buf;
2259                         if (*bufs == NULL)
2260                                 continue;
2261
2262                         hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2263                         buf = *bufs + samples_to_bytes(runtime, off);
2264                         if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2265                                 return -EFAULT;
2266                 }
2267         }
2268         return 0;
2269 }
2270
2271 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2272                                     void __user **bufs,
2273                                     snd_pcm_uframes_t frames)
2274 {
2275         struct snd_pcm_runtime *runtime;
2276         int nonblock;
2277         int err;
2278
2279         err = pcm_sanity_check(substream);
2280         if (err < 0)
2281                 return err;
2282         runtime = substream->runtime;
2283         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2284                 return -EBADFD;
2285
2286         nonblock = !!(substream->f_flags & O_NONBLOCK);
2287         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2288                 return -EINVAL;
2289         return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2290 }
2291
2292 EXPORT_SYMBOL(snd_pcm_lib_readv);