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/tlv.h>
  30 #include <sound/info.h>
  31 #include <sound/pcm.h>
  32 #include <sound/pcm_params.h>
  33 #include <sound/timer.h>
  34
  35 /*
  36  * fill ring buffer with silence
  37  * runtime->silence_start: starting pointer to silence area
  38  * runtime->silence_filled: size filled with silence
  39  * runtime->silence_threshold: threshold from application
  40  * runtime->silence_size: maximal size from application
  41  *
  42  * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
  43  */
  44 void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
  45 {
  46         struct snd_pcm_runtime *runtime = substream->runtime;
  47         snd_pcm_uframes_t frames, ofs, transfer;
  48
  49         if (runtime->silence_size < runtime->boundary) {
  50                 snd_pcm_sframes_t noise_dist, n;
  51                 if (runtime->silence_start != runtime->control->appl_ptr) {
  52                         n = runtime->control->appl_ptr - runtime->silence_start;
  53                         if (n < 0)
  54                                 n += runtime->boundary;
  55                         if ((snd_pcm_uframes_t)n < runtime->silence_filled)
  56                                 runtime->silence_filled -= n;
  57                         else
  58                                 runtime->silence_filled = 0;
  59                         runtime->silence_start = runtime->control->appl_ptr;
  60                 }
  61                 if (runtime->silence_filled >= runtime->buffer_size)
  62                         return;
  63                 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
  64                 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
  65                         return;
  66                 frames = runtime->silence_threshold - noise_dist;
  67                 if (frames > runtime->silence_size)
  68                         frames = runtime->silence_size;
  69         } else {
  70                 if (new_hw_ptr == ULONG_MAX) {  /* initialization */
  71                         snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
  72                         if (avail > runtime->buffer_size)
  73                                 avail = runtime->buffer_size;
  74                         runtime->silence_filled = avail > 0 ? avail : 0;
  75                         runtime->silence_start = (runtime->status->hw_ptr +
  76                                                   runtime->silence_filled) %
  77                                                  runtime->boundary;
  78                 } else {
  79                         ofs = runtime->status->hw_ptr;
  80                         frames = new_hw_ptr - ofs;
  81                         if ((snd_pcm_sframes_t)frames < 0)
  82                                 frames += runtime->boundary;
  83                         runtime->silence_filled -= frames;
  84                         if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
  85                                 runtime->silence_filled = 0;
  86                                 runtime->silence_start = new_hw_ptr;
  87                         } else {
  88                                 runtime->silence_start = ofs;
  89                         }
  90                 }
  91                 frames = runtime->buffer_size - runtime->silence_filled;
  92         }
  93         if (snd_BUG_ON(frames > runtime->buffer_size))
  94                 return;
  95         if (frames == 0)
  96                 return;
  97         ofs = runtime->silence_start % runtime->buffer_size;
  98         while (frames > 0) {
  99                 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
 100                 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
 101                     runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
 102                         if (substream->ops->silence) {
 103                                 int err;
 104                                 err = substream->ops->silence(substream, -1, ofs, transfer);
 105                                 snd_BUG_ON(err < 0);
 106                         } else {
 107                                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
 108                                 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
 109                         }
 110                 } else {
 111                         unsigned int c;
 112                         unsigned int channels = runtime->channels;
 113                         if (substream->ops->silence) {
 114                                 for (c = 0; c < channels; ++c) {
 115                                         int err;
 116                                         err = substream->ops->silence(substream, c, ofs, transfer);
 117                                         snd_BUG_ON(err < 0);
 118                                 }
 119                         } else {
 120                                 size_t dma_csize = runtime->dma_bytes / channels;
 121                                 for (c = 0; c < channels; ++c) {
 122                                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
 123                                         snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
 124                                 }
 125                         }
 126                 }
 127                 runtime->silence_filled += transfer;
 128                 frames -= transfer;
 129                 ofs = 0;
 130         }
 131 }
 132
 133 #ifdef CONFIG_SND_DEBUG
 134 void snd_pcm_debug_name(struct snd_pcm_substream *substream,
 135                            char *name, size_t len)
 136 {
 137         snprintf(name, len, "pcmC%dD%d%c:%d",
 138                  substream->pcm->card->number,
 139                  substream->pcm->device,
 140                  substream->stream ? 'c' : 'p',
 141                  substream->number);
 142 }
 143 EXPORT_SYMBOL(snd_pcm_debug_name);
 144 #endif
 145
 146 #define XRUN_DEBUG_BASIC        (1<<0)
 147 #define XRUN_DEBUG_STACK        (1<<1)  /* dump also stack */
 148 #define XRUN_DEBUG_JIFFIESCHECK (1<<2)  /* do jiffies check */
 149 #define XRUN_DEBUG_PERIODUPDATE (1<<3)  /* full period update info */
 150 #define XRUN_DEBUG_HWPTRUPDATE  (1<<4)  /* full hwptr update info */
 151 #define XRUN_DEBUG_LOG          (1<<5)  /* show last 10 positions on err */
 152 #define XRUN_DEBUG_LOGONCE      (1<<6)  /* do above only once */
 153
 154 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 155
 156 #define xrun_debug(substream, mask) \
 157                         ((substream)->pstr->xrun_debug & (mask))
 158 #else
 159 #define xrun_debug(substream, mask)     0
 160 #endif
 161
 162 #define dump_stack_on_xrun(substream) do {                      \
 163                 if (xrun_debug(substream, XRUN_DEBUG_STACK))    \
 164                         dump_stack();                           \
 165         } while (0)
 166
 167 static void xrun(struct snd_pcm_substream *substream)
 168 {
 169         struct snd_pcm_runtime *runtime = substream->runtime;
 170
 171         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 172                 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
 173         snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
 174         if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
 175                 char name[16];
 176                 snd_pcm_debug_name(substream, name, sizeof(name));
 177                 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
 178                 dump_stack_on_xrun(substream);
 179         }
 180 }
 181
 182 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
 183 #define hw_ptr_error(substream, fmt, args...)                           \
 184         do {                                                            \
 185                 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {          \
 186                         xrun_log_show(substream);                       \
 187                         if (printk_ratelimit()) {                       \
 188                                 snd_printd("PCM: " fmt, ##args);        \
 189                         }                                               \
 190                         dump_stack_on_xrun(substream);                  \
 191                 }                                                       \
 192         } while (0)
 193
 194 #define XRUN_LOG_CNT    10
 195
 196 struct hwptr_log_entry {
 197         unsigned int in_interrupt;
 198         unsigned long jiffies;
 199         snd_pcm_uframes_t pos;
 200         snd_pcm_uframes_t period_size;
 201         snd_pcm_uframes_t buffer_size;
 202         snd_pcm_uframes_t old_hw_ptr;
 203         snd_pcm_uframes_t hw_ptr_base;
 204 };
 205
 206 struct snd_pcm_hwptr_log {
 207         unsigned int idx;
 208         unsigned int hit: 1;
 209         struct hwptr_log_entry entries[XRUN_LOG_CNT];
 210 };
 211
 212 static void xrun_log(struct snd_pcm_substream *substream,
 213                      snd_pcm_uframes_t pos, int in_interrupt)
 214 {
 215         struct snd_pcm_runtime *runtime = substream->runtime;
 216         struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
 217         struct hwptr_log_entry *entry;
 218
 219         if (log == NULL) {
 220                 log = kzalloc(sizeof(*log), GFP_ATOMIC);
 221                 if (log == NULL)
 222                         return;
 223                 runtime->hwptr_log = log;
 224         } else {
 225                 if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
 226                         return;
 227         }
 228         entry = &log->entries[log->idx];
 229         entry->in_interrupt = in_interrupt;
 230         entry->jiffies = jiffies;
 231         entry->pos = pos;
 232         entry->period_size = runtime->period_size;
 233         entry->buffer_size = runtime->buffer_size;
 234         entry->old_hw_ptr = runtime->status->hw_ptr;
 235         entry->hw_ptr_base = runtime->hw_ptr_base;
 236         log->idx = (log->idx + 1) % XRUN_LOG_CNT;
 237 }
 238
 239 static void xrun_log_show(struct snd_pcm_substream *substream)
 240 {
 241         struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
 242         struct hwptr_log_entry *entry;
 243         char name[16];
 244         unsigned int idx;
 245         int cnt;
 246
 247         if (log == NULL)
 248                 return;
 249         if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
 250                 return;
 251         snd_pcm_debug_name(substream, name, sizeof(name));
 252         for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
 253                 entry = &log->entries[idx];
 254                 if (entry->period_size == 0)
 255                         break;
 256                 snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
 257                            "hwptr=%ld/%ld\n",
 258                            name, entry->in_interrupt ? "[Q] " : "",
 259                            entry->jiffies,
 260                            (unsigned long)entry->pos,
 261                            (unsigned long)entry->period_size,
 262                            (unsigned long)entry->buffer_size,
 263                            (unsigned long)entry->old_hw_ptr,
 264                            (unsigned long)entry->hw_ptr_base);
 265                 idx++;
 266                 idx %= XRUN_LOG_CNT;
 267         }
 268         log->hit = 1;
 269 }
 270
 271 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
 272
 273 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
 274 #define xrun_log(substream, pos, in_interrupt)  do { } while (0)
 275 #define xrun_log_show(substream)        do { } while (0)
 276
 277 #endif
 278
 279 int snd_pcm_update_state(struct snd_pcm_substream *substream,
 280                          struct snd_pcm_runtime *runtime)
 281 {
 282         snd_pcm_uframes_t avail;
 283
 284         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
 285                 avail = snd_pcm_playback_avail(runtime);
 286         else
 287                 avail = snd_pcm_capture_avail(runtime);
 288         if (avail > runtime->avail_max)
 289                 runtime->avail_max = avail;
 290         if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
 291                 if (avail >= runtime->buffer_size) {
 292                         snd_pcm_drain_done(substream);
 293                         return -EPIPE;
 294                 }
 295         } else {
 296                 if (avail >= runtime->stop_threshold) {
 297                         xrun(substream);
 298                         return -EPIPE;
 299                 }
 300         }
 301         if (runtime->twake) {
 302                 if (avail >= runtime->twake)
 303                         wake_up(&runtime->tsleep);
 304         } else if (avail >= runtime->control->avail_min)
 305                 wake_up(&runtime->sleep);
 306         return 0;
 307 }
 308
 309 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
 310                                   unsigned int in_interrupt)
 311 {
 312         struct snd_pcm_runtime *runtime = substream->runtime;
 313         snd_pcm_uframes_t pos;
 314         snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
 315         snd_pcm_sframes_t hdelta, delta;
 316         unsigned long jdelta;
 317         unsigned long curr_jiffies;
 318         struct timespec curr_tstamp;
 319
 320         old_hw_ptr = runtime->status->hw_ptr;
 321
 322         /*
 323          * group pointer, time and jiffies reads to allow for more
 324          * accurate correlations/corrections.
 325          * The values are stored at the end of this routine after
 326          * corrections for hw_ptr position
 327          */
 328         pos = substream->ops->pointer(substream);
 329         curr_jiffies = jiffies;
 330         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 331                 snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
 332
 333         if (pos == SNDRV_PCM_POS_XRUN) {
 334                 xrun(substream);
 335                 return -EPIPE;
 336         }
 337         if (pos >= runtime->buffer_size) {
 338                 if (printk_ratelimit()) {
 339                         char name[16];
 340                         snd_pcm_debug_name(substream, name, sizeof(name));
 341                         xrun_log_show(substream);
 342                         snd_printd(KERN_ERR  "BUG: %s, pos = %ld, "
 343                                    "buffer size = %ld, period size = %ld\n",
 344                                    name, pos, runtime->buffer_size,
 345                                    runtime->period_size);
 346                 }
 347                 pos = 0;
 348         }
 349         pos -= pos % runtime->min_align;
 350         if (xrun_debug(substream, XRUN_DEBUG_LOG))
 351                 xrun_log(substream, pos, in_interrupt);
 352         hw_base = runtime->hw_ptr_base;
 353         new_hw_ptr = hw_base + pos;
 354         if (in_interrupt) {
 355                 /* we know that one period was processed */
 356                 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
 357                 delta = runtime->hw_ptr_interrupt + runtime->period_size;
 358                 if (delta > new_hw_ptr) {
 359                         /* check for double acknowledged interrupts */
 360                         hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
 361                         if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
 362                                 hw_base += runtime->buffer_size;
 363                                 if (hw_base >= runtime->boundary)
 364                                         hw_base = 0;
 365                                 new_hw_ptr = hw_base + pos;
 366                                 goto __delta;
 367                         }
 368                 }
 369         }
 370         /* new_hw_ptr might be lower than old_hw_ptr in case when */
 371         /* pointer crosses the end of the ring buffer */
 372         if (new_hw_ptr < old_hw_ptr) {
 373                 hw_base += runtime->buffer_size;
 374                 if (hw_base >= runtime->boundary)
 375                         hw_base = 0;
 376                 new_hw_ptr = hw_base + pos;
 377         }
 378       __delta:
 379         delta = new_hw_ptr - old_hw_ptr;
 380         if (delta < 0)
 381                 delta += runtime->boundary;
 382         if (xrun_debug(substream, in_interrupt ?
 383                         XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
 384                 char name[16];
 385                 snd_pcm_debug_name(substream, name, sizeof(name));
 386                 snd_printd("%s_update: %s: pos=%u/%u/%u, "
 387                            "hwptr=%ld/%ld/%ld/%ld\n",
 388                            in_interrupt ? "period" : "hwptr",
 389                            name,
 390                            (unsigned int)pos,
 391                            (unsigned int)runtime->period_size,
 392                            (unsigned int)runtime->buffer_size,
 393                            (unsigned long)delta,
 394                            (unsigned long)old_hw_ptr,
 395                            (unsigned long)new_hw_ptr,
 396                            (unsigned long)runtime->hw_ptr_base);
 397         }
 398
 399         if (runtime->no_period_wakeup) {
 400                 snd_pcm_sframes_t xrun_threshold;
 401                 /*
 402                  * Without regular period interrupts, we have to check
 403                  * the elapsed time to detect xruns.
 404                  */
 405                 jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
 406                 if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
 407                         goto no_delta_check;
 408                 hdelta = jdelta - delta * HZ / runtime->rate;
 409                 xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
 410                 while (hdelta > xrun_threshold) {
 411                         delta += runtime->buffer_size;
 412                         hw_base += runtime->buffer_size;
 413                         if (hw_base >= runtime->boundary)
 414                                 hw_base = 0;
 415                         new_hw_ptr = hw_base + pos;
 416                         hdelta -= runtime->hw_ptr_buffer_jiffies;
 417                 }
 418                 goto no_delta_check;
 419         }
 420
 421         /* something must be really wrong */
 422         if (delta >= runtime->buffer_size + runtime->period_size) {
 423                 hw_ptr_error(substream,
 424                                "Unexpected hw_pointer value %s"
 425                                "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
 426                                "old_hw_ptr=%ld)\n",
 427                                      in_interrupt ? "[Q] " : "[P]",
 428                                      substream->stream, (long)pos,
 429                                      (long)new_hw_ptr, (long)old_hw_ptr);
 430                 return 0;
 431         }
 432
 433         /* Do jiffies check only in xrun_debug mode */
 434         if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
 435                 goto no_jiffies_check;
 436
 437         /* Skip the jiffies check for hardwares with BATCH flag.
 438          * Such hardware usually just increases the position at each IRQ,
 439          * thus it can't give any strange position.
 440          */
 441         if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
 442                 goto no_jiffies_check;
 443         hdelta = delta;
 444         if (hdelta < runtime->delay)
 445                 goto no_jiffies_check;
 446         hdelta -= runtime->delay;
 447         jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
 448         if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
 449                 delta = jdelta /
 450                         (((runtime->period_size * HZ) / runtime->rate)
 451                                                                 + HZ/100);
 452                 /* move new_hw_ptr according jiffies not pos variable */
 453                 new_hw_ptr = old_hw_ptr;
 454                 hw_base = delta;
 455                 /* use loop to avoid checks for delta overflows */
 456                 /* the delta value is small or zero in most cases */
 457                 while (delta > 0) {
 458                         new_hw_ptr += runtime->period_size;
 459                         if (new_hw_ptr >= runtime->boundary)
 460                                 new_hw_ptr -= runtime->boundary;
 461                         delta--;
 462                 }
 463                 /* align hw_base to buffer_size */
 464                 hw_ptr_error(substream,
 465                              "hw_ptr skipping! %s"
 466                              "(pos=%ld, delta=%ld, period=%ld, "
 467                              "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
 468                              in_interrupt ? "[Q] " : "",
 469                              (long)pos, (long)hdelta,
 470                              (long)runtime->period_size, jdelta,
 471                              ((hdelta * HZ) / runtime->rate), hw_base,
 472                              (unsigned long)old_hw_ptr,
 473                              (unsigned long)new_hw_ptr);
 474                 /* reset values to proper state */
 475                 delta = 0;
 476                 hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
 477         }
 478  no_jiffies_check:
 479         if (delta > runtime->period_size + runtime->period_size / 2) {
 480                 hw_ptr_error(substream,
 481                              "Lost interrupts? %s"
 482                              "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
 483                              "old_hw_ptr=%ld)\n",
 484                              in_interrupt ? "[Q] " : "",
 485                              substream->stream, (long)delta,
 486                              (long)new_hw_ptr,
 487                              (long)old_hw_ptr);
 488         }
 489
 490  no_delta_check:
 491         if (runtime->status->hw_ptr == new_hw_ptr)
 492                 return 0;
 493
 494         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
 495             runtime->silence_size > 0)
 496                 snd_pcm_playback_silence(substream, new_hw_ptr);
 497
 498         if (in_interrupt) {
 499                 delta = new_hw_ptr - runtime->hw_ptr_interrupt;
 500                 if (delta < 0)
 501                         delta += runtime->boundary;
 502                 delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
 503                 runtime->hw_ptr_interrupt += delta;
 504                 if (runtime->hw_ptr_interrupt >= runtime->boundary)
 505                         runtime->hw_ptr_interrupt -= runtime->boundary;
 506         }
 507         runtime->hw_ptr_base = hw_base;
 508         runtime->status->hw_ptr = new_hw_ptr;
 509         runtime->hw_ptr_jiffies = curr_jiffies;
 510         if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
 511                 runtime->status->tstamp = curr_tstamp;
 512
 513         return snd_pcm_update_state(substream, runtime);
 514 }
 515
 516 /* CAUTION: call it with irq disabled */
 517 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
 518 {
 519         return snd_pcm_update_hw_ptr0(substream, 0);
 520 }
 521
 522 /**
 523  * snd_pcm_set_ops - set the PCM operators
 524  * @pcm: the pcm instance
 525  * @direction: stream direction, SNDRV_PCM_STREAM_XXX
 526  * @ops: the operator table
 527  *
 528  * Sets the given PCM operators to the pcm instance.
 529  */
 530 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
 531 {
 532         struct snd_pcm_str *stream = &pcm->streams[direction];
 533         struct snd_pcm_substream *substream;
 534
 535         for (substream = stream->substream; substream != NULL; substream = substream->next)
 536                 substream->ops = ops;
 537 }
 538
 539 EXPORT_SYMBOL(snd_pcm_set_ops);
 540
 541 /**
 542  * snd_pcm_sync - set the PCM sync id
 543  * @substream: the pcm substream
 544  *
 545  * Sets the PCM sync identifier for the card.
 546  */
 547 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
 548 {
 549         struct snd_pcm_runtime *runtime = substream->runtime;
 550
 551         runtime->sync.id32[0] = substream->pcm->card->number;
 552         runtime->sync.id32[1] = -1;
 553         runtime->sync.id32[2] = -1;
 554         runtime->sync.id32[3] = -1;
 555 }
 556
 557 EXPORT_SYMBOL(snd_pcm_set_sync);
 558
 559 /*
 560  *  Standard ioctl routine
 561  */
 562
 563 static inline unsigned int div32(unsigned int a, unsigned int b,
 564                                  unsigned int *r)
 565 {
 566         if (b == 0) {
 567                 *r = 0;
 568                 return UINT_MAX;
 569         }
 570         *r = a % b;
 571         return a / b;
 572 }
 573
 574 static inline unsigned int div_down(unsigned int a, unsigned int b)
 575 {
 576         if (b == 0)
 577                 return UINT_MAX;
 578         return a / b;
 579 }
 580
 581 static inline unsigned int div_up(unsigned int a, unsigned int b)
 582 {
 583         unsigned int r;
 584         unsigned int q;
 585         if (b == 0)
 586                 return UINT_MAX;
 587         q = div32(a, b, &r);
 588         if (r)
 589                 ++q;
 590         return q;
 591 }
 592
 593 static inline unsigned int mul(unsigned int a, unsigned int b)
 594 {
 595         if (a == 0)
 596                 return 0;
 597         if (div_down(UINT_MAX, a) < b)
 598                 return UINT_MAX;
 599         return a * b;
 600 }
 601
 602 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
 603                                     unsigned int c, unsigned int *r)
 604 {
 605         u_int64_t n = (u_int64_t) a * b;
 606         if (c == 0) {
 607                 snd_BUG_ON(!n);
 608                 *r = 0;
 609                 return UINT_MAX;
 610         }
 611         n = div_u64_rem(n, c, r);
 612         if (n >= UINT_MAX) {
 613                 *r = 0;
 614                 return UINT_MAX;
 615         }
 616         return n;
 617 }
 618
 619 /**
 620  * snd_interval_refine - refine the interval value of configurator
 621  * @i: the interval value to refine
 622  * @v: the interval value to refer to
 623  *
 624  * Refines the interval value with the reference value.
 625  * The interval is changed to the range satisfying both intervals.
 626  * The interval status (min, max, integer, etc.) are evaluated.
 627  *
 628  * Returns non-zero if the value is changed, zero if not changed.
 629  */
 630 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
 631 {
 632         int changed = 0;
 633         if (snd_BUG_ON(snd_interval_empty(i)))
 634                 return -EINVAL;
 635         if (i->min < v->min) {
 636                 i->min = v->min;
 637                 i->openmin = v->openmin;
 638                 changed = 1;
 639         } else if (i->min == v->min && !i->openmin && v->openmin) {
 640                 i->openmin = 1;
 641                 changed = 1;
 642         }
 643         if (i->max > v->max) {
 644                 i->max = v->max;
 645                 i->openmax = v->openmax;
 646                 changed = 1;
 647         } else if (i->max == v->max && !i->openmax && v->openmax) {
 648                 i->openmax = 1;
 649                 changed = 1;
 650         }
 651         if (!i->integer && v->integer) {
 652                 i->integer = 1;
 653                 changed = 1;
 654         }
 655         if (i->integer) {
 656                 if (i->openmin) {
 657                         i->min++;
 658                         i->openmin = 0;
 659                 }
 660                 if (i->openmax) {
 661                         i->max--;
 662                         i->openmax = 0;
 663                 }
 664         } else if (!i->openmin && !i->openmax && i->min == i->max)
 665                 i->integer = 1;
 666         if (snd_interval_checkempty(i)) {
 667                 snd_interval_none(i);
 668                 return -EINVAL;
 669         }
 670         return changed;
 671 }
 672
 673 EXPORT_SYMBOL(snd_interval_refine);
 674
 675 static int snd_interval_refine_first(struct snd_interval *i)
 676 {
 677         if (snd_BUG_ON(snd_interval_empty(i)))
 678                 return -EINVAL;
 679         if (snd_interval_single(i))
 680                 return 0;
 681         i->max = i->min;
 682         i->openmax = i->openmin;
 683         if (i->openmax)
 684                 i->max++;
 685         return 1;
 686 }
 687
 688 static int snd_interval_refine_last(struct snd_interval *i)
 689 {
 690         if (snd_BUG_ON(snd_interval_empty(i)))
 691                 return -EINVAL;
 692         if (snd_interval_single(i))
 693                 return 0;
 694         i->min = i->max;
 695         i->openmin = i->openmax;
 696         if (i->openmin)
 697                 i->min--;
 698         return 1;
 699 }
 700
 701 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 702 {
 703         if (a->empty || b->empty) {
 704                 snd_interval_none(c);
 705                 return;
 706         }
 707         c->empty = 0;
 708         c->min = mul(a->min, b->min);
 709         c->openmin = (a->openmin || b->openmin);
 710         c->max = mul(a->max,  b->max);
 711         c->openmax = (a->openmax || b->openmax);
 712         c->integer = (a->integer && b->integer);
 713 }
 714
 715 /**
 716  * snd_interval_div - refine the interval value with division
 717  * @a: dividend
 718  * @b: divisor
 719  * @c: quotient
 720  *
 721  * c = a / b
 722  *
 723  * Returns non-zero if the value is changed, zero if not changed.
 724  */
 725 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
 726 {
 727         unsigned int r;
 728         if (a->empty || b->empty) {
 729                 snd_interval_none(c);
 730                 return;
 731         }
 732         c->empty = 0;
 733         c->min = div32(a->min, b->max, &r);
 734         c->openmin = (r || a->openmin || b->openmax);
 735         if (b->min > 0) {
 736                 c->max = div32(a->max, b->min, &r);
 737                 if (r) {
 738                         c->max++;
 739                         c->openmax = 1;
 740                 } else
 741                         c->openmax = (a->openmax || b->openmin);
 742         } else {
 743                 c->max = UINT_MAX;
 744                 c->openmax = 0;
 745         }
 746         c->integer = 0;
 747 }
 748
 749 /**
 750  * snd_interval_muldivk - refine the interval value
 751  * @a: dividend 1
 752  * @b: dividend 2
 753  * @k: divisor (as integer)
 754  * @c: result
 755   *
 756  * c = a * b / k
 757  *
 758  * Returns non-zero if the value is changed, zero if not changed.
 759  */
 760 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
 761                       unsigned int k, struct snd_interval *c)
 762 {
 763         unsigned int r;
 764         if (a->empty || b->empty) {
 765                 snd_interval_none(c);
 766                 return;
 767         }
 768         c->empty = 0;
 769         c->min = muldiv32(a->min, b->min, k, &r);
 770         c->openmin = (r || a->openmin || b->openmin);
 771         c->max = muldiv32(a->max, b->max, k, &r);
 772         if (r) {
 773                 c->max++;
 774                 c->openmax = 1;
 775         } else
 776                 c->openmax = (a->openmax || b->openmax);
 777         c->integer = 0;
 778 }
 779
 780 /**
 781  * snd_interval_mulkdiv - refine the interval value
 782  * @a: dividend 1
 783  * @k: dividend 2 (as integer)
 784  * @b: divisor
 785  * @c: result
 786  *
 787  * c = a * k / b
 788  *
 789  * Returns non-zero if the value is changed, zero if not changed.
 790  */
 791 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
 792                       const struct snd_interval *b, struct snd_interval *c)
 793 {
 794         unsigned int r;
 795         if (a->empty || b->empty) {
 796                 snd_interval_none(c);
 797                 return;
 798         }
 799         c->empty = 0;
 800         c->min = muldiv32(a->min, k, b->max, &r);
 801         c->openmin = (r || a->openmin || b->openmax);
 802         if (b->min > 0) {
 803                 c->max = muldiv32(a->max, k, b->min, &r);
 804                 if (r) {
 805                         c->max++;
 806                         c->openmax = 1;
 807                 } else
 808                         c->openmax = (a->openmax || b->openmin);
 809         } else {
 810                 c->max = UINT_MAX;
 811                 c->openmax = 0;
 812         }
 813         c->integer = 0;
 814 }
 815
 816 /* ---- */
 817
 818
 819 /**
 820  * snd_interval_ratnum - refine the interval value
 821  * @i: interval to refine
 822  * @rats_count: number of ratnum_t
 823  * @rats: ratnum_t array
 824  * @nump: pointer to store the resultant numerator
 825  * @denp: pointer to store the resultant denominator
 826  *
 827  * Returns non-zero if the value is changed, zero if not changed.
 828  */
 829 int snd_interval_ratnum(struct snd_interval *i,
 830                         unsigned int rats_count, struct snd_ratnum *rats,
 831                         unsigned int *nump, unsigned int *denp)
 832 {
 833         unsigned int best_num, best_den;
 834         int best_diff;
 835         unsigned int k;
 836         struct snd_interval t;
 837         int err;
 838         unsigned int result_num, result_den;
 839         int result_diff;
 840
 841         best_num = best_den = best_diff = 0;
 842         for (k = 0; k < rats_count; ++k) {
 843                 unsigned int num = rats[k].num;
 844                 unsigned int den;
 845                 unsigned int q = i->min;
 846                 int diff;
 847                 if (q == 0)
 848                         q = 1;
 849                 den = div_up(num, q);
 850                 if (den < rats[k].den_min)
 851                         continue;
 852                 if (den > rats[k].den_max)
 853                         den = rats[k].den_max;
 854                 else {
 855                         unsigned int r;
 856                         r = (den - rats[k].den_min) % rats[k].den_step;
 857                         if (r != 0)
 858                                 den -= r;
 859                 }
 860                 diff = num - q * den;
 861                 if (diff < 0)
 862                         diff = -diff;
 863                 if (best_num == 0 ||
 864                     diff * best_den < best_diff * den) {
 865                         best_diff = diff;
 866                         best_den = den;
 867                         best_num = num;
 868                 }
 869         }
 870         if (best_den == 0) {
 871                 i->empty = 1;
 872                 return -EINVAL;
 873         }
 874         t.min = div_down(best_num, best_den);
 875         t.openmin = !!(best_num % best_den);
 876
 877         result_num = best_num;
 878         result_diff = best_diff;
 879         result_den = best_den;
 880         best_num = best_den = best_diff = 0;
 881         for (k = 0; k < rats_count; ++k) {
 882                 unsigned int num = rats[k].num;
 883                 unsigned int den;
 884                 unsigned int q = i->max;
 885                 int diff;
 886                 if (q == 0) {
 887                         i->empty = 1;
 888                         return -EINVAL;
 889                 }
 890                 den = div_down(num, q);
 891                 if (den > rats[k].den_max)
 892                         continue;
 893                 if (den < rats[k].den_min)
 894                         den = rats[k].den_min;
 895                 else {
 896                         unsigned int r;
 897                         r = (den - rats[k].den_min) % rats[k].den_step;
 898                         if (r != 0)
 899                                 den += rats[k].den_step - r;
 900                 }
 901                 diff = q * den - num;
 902                 if (diff < 0)
 903                         diff = -diff;
 904                 if (best_num == 0 ||
 905                     diff * best_den < best_diff * den) {
 906                         best_diff = diff;
 907                         best_den = den;
 908                         best_num = num;
 909                 }
 910         }
 911         if (best_den == 0) {
 912                 i->empty = 1;
 913                 return -EINVAL;
 914         }
 915         t.max = div_up(best_num, best_den);
 916         t.openmax = !!(best_num % best_den);
 917         t.integer = 0;
 918         err = snd_interval_refine(i, &t);
 919         if (err < 0)
 920                 return err;
 921
 922         if (snd_interval_single(i)) {
 923                 if (best_diff * result_den < result_diff * best_den) {
 924                         result_num = best_num;
 925                         result_den = best_den;
 926                 }
 927                 if (nump)
 928                         *nump = result_num;
 929                 if (denp)
 930                         *denp = result_den;
 931         }
 932         return err;
 933 }
 934
 935 EXPORT_SYMBOL(snd_interval_ratnum);
 936
 937 /**
 938  * snd_interval_ratden - refine the interval value
 939  * @i: interval to refine
 940  * @rats_count: number of struct ratden
 941  * @rats: struct ratden array
 942  * @nump: pointer to store the resultant numerator
 943  * @denp: pointer to store the resultant denominator
 944  *
 945  * Returns non-zero if the value is changed, zero if not changed.
 946  */
 947 static int snd_interval_ratden(struct snd_interval *i,
 948                                unsigned int rats_count, struct snd_ratden *rats,
 949                                unsigned int *nump, unsigned int *denp)
 950 {
 951         unsigned int best_num, best_diff, best_den;
 952         unsigned int k;
 953         struct snd_interval t;
 954         int err;
 955
 956         best_num = best_den = best_diff = 0;
 957         for (k = 0; k < rats_count; ++k) {
 958                 unsigned int num;
 959                 unsigned int den = rats[k].den;
 960                 unsigned int q = i->min;
 961                 int diff;
 962                 num = mul(q, den);
 963                 if (num > rats[k].num_max)
 964                         continue;
 965                 if (num < rats[k].num_min)
 966                         num = rats[k].num_max;
 967                 else {
 968                         unsigned int r;
 969                         r = (num - rats[k].num_min) % rats[k].num_step;
 970                         if (r != 0)
 971                                 num += rats[k].num_step - r;
 972                 }
 973                 diff = num - q * den;
 974                 if (best_num == 0 ||
 975                     diff * best_den < best_diff * den) {
 976                         best_diff = diff;
 977                         best_den = den;
 978                         best_num = num;
 979                 }
 980         }
 981         if (best_den == 0) {
 982                 i->empty = 1;
 983                 return -EINVAL;
 984         }
 985         t.min = div_down(best_num, best_den);
 986         t.openmin = !!(best_num % best_den);
 987
 988         best_num = best_den = best_diff = 0;
 989         for (k = 0; k < rats_count; ++k) {
 990                 unsigned int num;
 991                 unsigned int den = rats[k].den;
 992                 unsigned int q = i->max;
 993                 int diff;
 994                 num = mul(q, den);
 995                 if (num < rats[k].num_min)
 996                         continue;
 997                 if (num > rats[k].num_max)
 998                         num = rats[k].num_max;
 999                 else {
1000                         unsigned int r;
1001                         r = (num - rats[k].num_min) % rats[k].num_step;
1002                         if (r != 0)
1003                                 num -= r;
1004                 }
1005                 diff = q * den - num;
1006                 if (best_num == 0 ||
1007                     diff * best_den < best_diff * den) {
1008                         best_diff = diff;
1009                         best_den = den;
1010                         best_num = num;
1011                 }
1012         }
1013         if (best_den == 0) {
1014                 i->empty = 1;
1015                 return -EINVAL;
1016         }
1017         t.max = div_up(best_num, best_den);
1018         t.openmax = !!(best_num % best_den);
1019         t.integer = 0;
1020         err = snd_interval_refine(i, &t);
1021         if (err < 0)
1022                 return err;
1023
1024         if (snd_interval_single(i)) {
1025                 if (nump)
1026                         *nump = best_num;
1027                 if (denp)
1028                         *denp = best_den;
1029         }
1030         return err;
1031 }
1032
1033 /**
1034  * snd_interval_list - refine the interval value from the list
1035  * @i: the interval value to refine
1036  * @count: the number of elements in the list
1037  * @list: the value list
1038  * @mask: the bit-mask to evaluate
1039  *
1040  * Refines the interval value from the list.
1041  * When mask is non-zero, only the elements corresponding to bit 1 are
1042  * evaluated.
1043  *
1044  * Returns non-zero if the value is changed, zero if not changed.
1045  */
1046 int snd_interval_list(struct snd_interval *i, unsigned int count,
1047                       const unsigned int *list, unsigned int mask)
1048 {
1049         unsigned int k;
1050         struct snd_interval list_range;
1051
1052         if (!count) {
1053                 i->empty = 1;
1054                 return -EINVAL;
1055         }
1056         snd_interval_any(&list_range);
1057         list_range.min = UINT_MAX;
1058         list_range.max = 0;
1059         for (k = 0; k < count; k++) {
1060                 if (mask && !(mask & (1 << k)))
1061                         continue;
1062                 if (!snd_interval_test(i, list[k]))
1063                         continue;
1064                 list_range.min = min(list_range.min, list[k]);
1065                 list_range.max = max(list_range.max, list[k]);
1066         }
1067         return snd_interval_refine(i, &list_range);
1068 }
1069
1070 EXPORT_SYMBOL(snd_interval_list);
1071
1072 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
1073 {
1074         unsigned int n;
1075         int changed = 0;
1076         n = (i->min - min) % step;
1077         if (n != 0 || i->openmin) {
1078                 i->min += step - n;
1079                 changed = 1;
1080         }
1081         n = (i->max - min) % step;
1082         if (n != 0 || i->openmax) {
1083                 i->max -= n;
1084                 changed = 1;
1085         }
1086         if (snd_interval_checkempty(i)) {
1087                 i->empty = 1;
1088                 return -EINVAL;
1089         }
1090         return changed;
1091 }
1092
1093 /* Info constraints helpers */
1094
1095 /**
1096  * snd_pcm_hw_rule_add - add the hw-constraint rule
1097  * @runtime: the pcm runtime instance
1098  * @cond: condition bits
1099  * @var: the variable to evaluate
1100  * @func: the evaluation function
1101  * @private: the private data pointer passed to function
1102  * @dep: the dependent variables
1103  *
1104  * Returns zero if successful, or a negative error code on failure.
1105  */
1106 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1107                         int var,
1108                         snd_pcm_hw_rule_func_t func, void *private,
1109                         int dep, ...)
1110 {
1111         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1112         struct snd_pcm_hw_rule *c;
1113         unsigned int k;
1114         va_list args;
1115         va_start(args, dep);
1116         if (constrs->rules_num >= constrs->rules_all) {
1117                 struct snd_pcm_hw_rule *new;
1118                 unsigned int new_rules = constrs->rules_all + 16;
1119                 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1120                 if (!new) {
1121                         va_end(args);
1122                         return -ENOMEM;
1123                 }
1124                 if (constrs->rules) {
1125                         memcpy(new, constrs->rules,
1126                                constrs->rules_num * sizeof(*c));
1127                         kfree(constrs->rules);
1128                 }
1129                 constrs->rules = new;
1130                 constrs->rules_all = new_rules;
1131         }
1132         c = &constrs->rules[constrs->rules_num];
1133         c->cond = cond;
1134         c->func = func;
1135         c->var = var;
1136         c->private = private;
1137         k = 0;
1138         while (1) {
1139                 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
1140                         va_end(args);
1141                         return -EINVAL;
1142                 }
1143                 c->deps[k++] = dep;
1144                 if (dep < 0)
1145                         break;
1146                 dep = va_arg(args, int);
1147         }
1148         constrs->rules_num++;
1149         va_end(args);
1150         return 0;
1151 }
1152
1153 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1154
1155 /**
1156  * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1157  * @runtime: PCM runtime instance
1158  * @var: hw_params variable to apply the mask
1159  * @mask: the bitmap mask
1160  *
1161  * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1162  */
1163 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1164                                u_int32_t mask)
1165 {
1166         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1167         struct snd_mask *maskp = constrs_mask(constrs, var);
1168         *maskp->bits &= mask;
1169         memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1170         if (*maskp->bits == 0)
1171                 return -EINVAL;
1172         return 0;
1173 }
1174
1175 /**
1176  * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1177  * @runtime: PCM runtime instance
1178  * @var: hw_params variable to apply the mask
1179  * @mask: the 64bit bitmap mask
1180  *
1181  * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1182  */
1183 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1184                                  u_int64_t mask)
1185 {
1186         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1187         struct snd_mask *maskp = constrs_mask(constrs, var);
1188         maskp->bits[0] &= (u_int32_t)mask;
1189         maskp->bits[1] &= (u_int32_t)(mask >> 32);
1190         memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1191         if (! maskp->bits[0] && ! maskp->bits[1])
1192                 return -EINVAL;
1193         return 0;
1194 }
1195
1196 /**
1197  * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1198  * @runtime: PCM runtime instance
1199  * @var: hw_params variable to apply the integer constraint
1200  *
1201  * Apply the constraint of integer to an interval parameter.
1202  */
1203 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1204 {
1205         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1206         return snd_interval_setinteger(constrs_interval(constrs, var));
1207 }
1208
1209 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1210
1211 /**
1212  * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1213  * @runtime: PCM runtime instance
1214  * @var: hw_params variable to apply the range
1215  * @min: the minimal value
1216  * @max: the maximal value
1217  *
1218  * Apply the min/max range constraint to an interval parameter.
1219  */
1220 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1221                                  unsigned int min, unsigned int max)
1222 {
1223         struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1224         struct snd_interval t;
1225         t.min = min;
1226         t.max = max;
1227         t.openmin = t.openmax = 0;
1228         t.integer = 0;
1229         return snd_interval_refine(constrs_interval(constrs, var), &t);
1230 }
1231
1232 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1233
1234 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1235                                 struct snd_pcm_hw_rule *rule)
1236 {
1237         struct snd_pcm_hw_constraint_list *list = rule->private;
1238         return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1239 }
1240
1241
1242 /**
1243  * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1244  * @runtime: PCM runtime instance
1245  * @cond: condition bits
1246  * @var: hw_params variable to apply the list constraint
1247  * @l: list
1248  *
1249  * Apply the list of constraints to an interval parameter.
1250  */
1251 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1252                                unsigned int cond,
1253                                snd_pcm_hw_param_t var,
1254                                const struct snd_pcm_hw_constraint_list *l)
1255 {
1256         return snd_pcm_hw_rule_add(runtime, cond, var,
1257                                    snd_pcm_hw_rule_list, (void *)l,
1258                                    var, -1);
1259 }
1260
1261 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1262
1263 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1264                                    struct snd_pcm_hw_rule *rule)
1265 {
1266         struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1267         unsigned int num = 0, den = 0;
1268         int err;
1269         err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1270                                   r->nrats, r->rats, &num, &den);
1271         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1272                 params->rate_num = num;
1273                 params->rate_den = den;
1274         }
1275         return err;
1276 }
1277
1278 /**
1279  * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1280  * @runtime: PCM runtime instance
1281  * @cond: condition bits
1282  * @var: hw_params variable to apply the ratnums constraint
1283  * @r: struct snd_ratnums constriants
1284  */
1285 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1286                                   unsigned int cond,
1287                                   snd_pcm_hw_param_t var,
1288                                   struct snd_pcm_hw_constraint_ratnums *r)
1289 {
1290         return snd_pcm_hw_rule_add(runtime, cond, var,
1291                                    snd_pcm_hw_rule_ratnums, r,
1292                                    var, -1);
1293 }
1294
1295 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1296
1297 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1298                                    struct snd_pcm_hw_rule *rule)
1299 {
1300         struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1301         unsigned int num = 0, den = 0;
1302         int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1303                                   r->nrats, r->rats, &num, &den);
1304         if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1305                 params->rate_num = num;
1306                 params->rate_den = den;
1307         }
1308         return err;
1309 }
1310
1311 /**
1312  * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1313  * @runtime: PCM runtime instance
1314  * @cond: condition bits
1315  * @var: hw_params variable to apply the ratdens constraint
1316  * @r: struct snd_ratdens constriants
1317  */
1318 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1319                                   unsigned int cond,
1320                                   snd_pcm_hw_param_t var,
1321                                   struct snd_pcm_hw_constraint_ratdens *r)
1322 {
1323         return snd_pcm_hw_rule_add(runtime, cond, var,
1324                                    snd_pcm_hw_rule_ratdens, r,
1325                                    var, -1);
1326 }
1327
1328 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1329
1330 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1331                                   struct snd_pcm_hw_rule *rule)
1332 {
1333         unsigned int l = (unsigned long) rule->private;
1334         int width = l & 0xffff;
1335         unsigned int msbits = l >> 16;
1336         struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1337         if (snd_interval_single(i) && snd_interval_value(i) == width)
1338                 params->msbits = msbits;
1339         return 0;
1340 }
1341
1342 /**
1343  * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1344  * @runtime: PCM runtime instance
1345  * @cond: condition bits
1346  * @width: sample bits width
1347  * @msbits: msbits width
1348  */
1349 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1350                                  unsigned int cond,
1351                                  unsigned int width,
1352                                  unsigned int msbits)
1353 {
1354         unsigned long l = (msbits << 16) | width;
1355         return snd_pcm_hw_rule_add(runtime, cond, -1,
1356                                     snd_pcm_hw_rule_msbits,
1357                                     (void*) l,
1358                                     SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1359 }
1360
1361 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1362
1363 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1364                                 struct snd_pcm_hw_rule *rule)
1365 {
1366         unsigned long step = (unsigned long) rule->private;
1367         return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1368 }
1369
1370 /**
1371  * snd_pcm_hw_constraint_step - add a hw constraint step rule
1372  * @runtime: PCM runtime instance
1373  * @cond: condition bits
1374  * @var: hw_params variable to apply the step constraint
1375  * @step: step size
1376  */
1377 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1378                                unsigned int cond,
1379                                snd_pcm_hw_param_t var,
1380                                unsigned long step)
1381 {
1382         return snd_pcm_hw_rule_add(runtime, cond, var,
1383                                    snd_pcm_hw_rule_step, (void *) step,
1384                                    var, -1);
1385 }
1386
1387 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1388
1389 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1390 {
1391         static unsigned int pow2_sizes[] = {
1392                 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1393                 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1394                 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1395                 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1396         };
1397         return snd_interval_list(hw_param_interval(params, rule->var),
1398                                  ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1399 }
1400
1401 /**
1402  * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1403  * @runtime: PCM runtime instance
1404  * @cond: condition bits
1405  * @var: hw_params variable to apply the power-of-2 constraint
1406  */
1407 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1408                                unsigned int cond,
1409                                snd_pcm_hw_param_t var)
1410 {
1411         return snd_pcm_hw_rule_add(runtime, cond, var,
1412                                    snd_pcm_hw_rule_pow2, NULL,
1413                                    var, -1);
1414 }
1415
1416 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1417
1418 static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
1419                                            struct snd_pcm_hw_rule *rule)
1420 {
1421         unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
1422         struct snd_interval *rate;
1423
1424         rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
1425         return snd_interval_list(rate, 1, &base_rate, 0);
1426 }
1427
1428 /**
1429  * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1430  * @runtime: PCM runtime instance
1431  * @base_rate: the rate at which the hardware does not resample
1432  */
1433 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
1434                                unsigned int base_rate)
1435 {
1436         return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
1437                                    SNDRV_PCM_HW_PARAM_RATE,
1438                                    snd_pcm_hw_rule_noresample_func,
1439                                    (void *)(uintptr_t)base_rate,
1440                                    SNDRV_PCM_HW_PARAM_RATE, -1);
1441 }
1442 EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
1443
1444 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1445                                   snd_pcm_hw_param_t var)
1446 {
1447         if (hw_is_mask(var)) {
1448                 snd_mask_any(hw_param_mask(params, var));
1449                 params->cmask |= 1 << var;
1450                 params->rmask |= 1 << var;
1451                 return;
1452         }
1453         if (hw_is_interval(var)) {
1454                 snd_interval_any(hw_param_interval(params, var));
1455                 params->cmask |= 1 << var;
1456                 params->rmask |= 1 << var;
1457                 return;
1458         }
1459         snd_BUG();
1460 }
1461
1462 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1463 {
1464         unsigned int k;
1465         memset(params, 0, sizeof(*params));
1466         for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1467                 _snd_pcm_hw_param_any(params, k);
1468         for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1469                 _snd_pcm_hw_param_any(params, k);
1470         params->info = ~0U;
1471 }
1472
1473 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1474
1475 /**
1476  * snd_pcm_hw_param_value - return @params field @var value
1477  * @params: the hw_params instance
1478  * @var: parameter to retrieve
1479  * @dir: pointer to the direction (-1,0,1) or %NULL
1480  *
1481  * Return the value for field @var if it's fixed in configuration space
1482  * defined by @params. Return -%EINVAL otherwise.
1483  */
1484 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1485                            snd_pcm_hw_param_t var, int *dir)
1486 {
1487         if (hw_is_mask(var)) {
1488                 const struct snd_mask *mask = hw_param_mask_c(params, var);
1489                 if (!snd_mask_single(mask))
1490                         return -EINVAL;
1491                 if (dir)
1492                         *dir = 0;
1493                 return snd_mask_value(mask);
1494         }
1495         if (hw_is_interval(var)) {
1496                 const struct snd_interval *i = hw_param_interval_c(params, var);
1497                 if (!snd_interval_single(i))
1498                         return -EINVAL;
1499                 if (dir)
1500                         *dir = i->openmin;
1501                 return snd_interval_value(i);
1502         }
1503         return -EINVAL;
1504 }
1505
1506 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1507
1508 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1509                                 snd_pcm_hw_param_t var)
1510 {
1511         if (hw_is_mask(var)) {
1512                 snd_mask_none(hw_param_mask(params, var));
1513                 params->cmask |= 1 << var;
1514                 params->rmask |= 1 << var;
1515         } else if (hw_is_interval(var)) {
1516                 snd_interval_none(hw_param_interval(params, var));
1517                 params->cmask |= 1 << var;
1518                 params->rmask |= 1 << var;
1519         } else {
1520                 snd_BUG();
1521         }
1522 }
1523
1524 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1525
1526 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1527                                    snd_pcm_hw_param_t var)
1528 {
1529         int changed;
1530         if (hw_is_mask(var))
1531                 changed = snd_mask_refine_first(hw_param_mask(params, var));
1532         else if (hw_is_interval(var))
1533                 changed = snd_interval_refine_first(hw_param_interval(params, var));
1534         else
1535                 return -EINVAL;
1536         if (changed) {
1537                 params->cmask |= 1 << var;
1538                 params->rmask |= 1 << var;
1539         }
1540         return changed;
1541 }
1542
1543
1544 /**
1545  * snd_pcm_hw_param_first - refine config space and return minimum value
1546  * @pcm: PCM instance
1547  * @params: the hw_params instance
1548  * @var: parameter to retrieve
1549  * @dir: pointer to the direction (-1,0,1) or %NULL
1550  *
1551  * Inside configuration space defined by @params remove from @var all
1552  * values > minimum. Reduce configuration space accordingly.
1553  * Return the minimum.
1554  */
1555 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1556                            struct snd_pcm_hw_params *params,
1557                            snd_pcm_hw_param_t var, int *dir)
1558 {
1559         int changed = _snd_pcm_hw_param_first(params, var);
1560         if (changed < 0)
1561                 return changed;
1562         if (params->rmask) {
1563                 int err = snd_pcm_hw_refine(pcm, params);
1564                 if (snd_BUG_ON(err < 0))
1565                         return err;
1566         }
1567         return snd_pcm_hw_param_value(params, var, dir);
1568 }
1569
1570 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1571
1572 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1573                                   snd_pcm_hw_param_t var)
1574 {
1575         int changed;
1576         if (hw_is_mask(var))
1577                 changed = snd_mask_refine_last(hw_param_mask(params, var));
1578         else if (hw_is_interval(var))
1579                 changed = snd_interval_refine_last(hw_param_interval(params, var));
1580         else
1581                 return -EINVAL;
1582         if (changed) {
1583                 params->cmask |= 1 << var;
1584                 params->rmask |= 1 << var;
1585         }
1586         return changed;
1587 }
1588
1589
1590 /**
1591  * snd_pcm_hw_param_last - refine config space and return maximum value
1592  * @pcm: PCM instance
1593  * @params: the hw_params instance
1594  * @var: parameter to retrieve
1595  * @dir: pointer to the direction (-1,0,1) or %NULL
1596  *
1597  * Inside configuration space defined by @params remove from @var all
1598  * values < maximum. Reduce configuration space accordingly.
1599  * Return the maximum.
1600  */
1601 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1602                           struct snd_pcm_hw_params *params,
1603                           snd_pcm_hw_param_t var, int *dir)
1604 {
1605         int changed = _snd_pcm_hw_param_last(params, var);
1606         if (changed < 0)
1607                 return changed;
1608         if (params->rmask) {
1609                 int err = snd_pcm_hw_refine(pcm, params);
1610                 if (snd_BUG_ON(err < 0))
1611                         return err;
1612         }
1613         return snd_pcm_hw_param_value(params, var, dir);
1614 }
1615
1616 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1617
1618 /**
1619  * snd_pcm_hw_param_choose - choose a configuration defined by @params
1620  * @pcm: PCM instance
1621  * @params: the hw_params instance
1622  *
1623  * Choose one configuration from configuration space defined by @params.
1624  * The configuration chosen is that obtained fixing in this order:
1625  * first access, first format, first subformat, min channels,
1626  * min rate, min period time, max buffer size, min tick time
1627  */
1628 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1629                              struct snd_pcm_hw_params *params)
1630 {
1631         static int vars[] = {
1632                 SNDRV_PCM_HW_PARAM_ACCESS,
1633                 SNDRV_PCM_HW_PARAM_FORMAT,
1634                 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1635                 SNDRV_PCM_HW_PARAM_CHANNELS,
1636                 SNDRV_PCM_HW_PARAM_RATE,
1637                 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1638                 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1639                 SNDRV_PCM_HW_PARAM_TICK_TIME,
1640                 -1
1641         };
1642         int err, *v;
1643
1644         for (v = vars; *v != -1; v++) {
1645                 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1646                         err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1647                 else
1648                         err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1649                 if (snd_BUG_ON(err < 0))
1650                         return err;
1651         }
1652         return 0;
1653 }
1654
1655 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1656                                    void *arg)
1657 {
1658         struct snd_pcm_runtime *runtime = substream->runtime;
1659         unsigned long flags;
1660         snd_pcm_stream_lock_irqsave(substream, flags);
1661         if (snd_pcm_running(substream) &&
1662             snd_pcm_update_hw_ptr(substream) >= 0)
1663                 runtime->status->hw_ptr %= runtime->buffer_size;
1664         else
1665                 runtime->status->hw_ptr = 0;
1666         snd_pcm_stream_unlock_irqrestore(substream, flags);
1667         return 0;
1668 }
1669
1670 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1671                                           void *arg)
1672 {
1673         struct snd_pcm_channel_info *info = arg;
1674         struct snd_pcm_runtime *runtime = substream->runtime;
1675         int width;
1676         if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1677                 info->offset = -1;
1678                 return 0;
1679         }
1680         width = snd_pcm_format_physical_width(runtime->format);
1681         if (width < 0)
1682                 return width;
1683         info->offset = 0;
1684         switch (runtime->access) {
1685         case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1686         case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1687                 info->first = info->channel * width;
1688                 info->step = runtime->channels * width;
1689                 break;
1690         case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1691         case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1692         {
1693                 size_t size = runtime->dma_bytes / runtime->channels;
1694                 info->first = info->channel * size * 8;
1695                 info->step = width;
1696                 break;
1697         }
1698         default:
1699                 snd_BUG();
1700                 break;
1701         }
1702         return 0;
1703 }
1704
1705 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1706                                        void *arg)
1707 {
1708         struct snd_pcm_hw_params *params = arg;
1709         snd_pcm_format_t format;
1710         int channels, width;
1711
1712         params->fifo_size = substream->runtime->hw.fifo_size;
1713         if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1714                 format = params_format(params);
1715                 channels = params_channels(params);
1716                 width = snd_pcm_format_physical_width(format);
1717                 params->fifo_size /= width * channels;
1718         }
1719         return 0;
1720 }
1721
1722 /**
1723  * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1724  * @substream: the pcm substream instance
1725  * @cmd: ioctl command
1726  * @arg: ioctl argument
1727  *
1728  * Processes the generic ioctl commands for PCM.
1729  * Can be passed as the ioctl callback for PCM ops.
1730  *
1731  * Returns zero if successful, or a negative error code on failure.
1732  */
1733 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1734                       unsigned int cmd, void *arg)
1735 {
1736         switch (cmd) {
1737         case SNDRV_PCM_IOCTL1_INFO:
1738                 return 0;
1739         case SNDRV_PCM_IOCTL1_RESET:
1740                 return snd_pcm_lib_ioctl_reset(substream, arg);
1741         case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1742                 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1743         case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1744                 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1745         }
1746         return -ENXIO;
1747 }
1748
1749 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1750
1751 /**
1752  * snd_pcm_period_elapsed - update the pcm status for the next period
1753  * @substream: the pcm substream instance
1754  *
1755  * This function is called from the interrupt handler when the
1756  * PCM has processed the period size.  It will update the current
1757  * pointer, wake up sleepers, etc.
1758  *
1759  * Even if more than one periods have elapsed since the last call, you
1760  * have to call this only once.
1761  */
1762 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1763 {
1764         struct snd_pcm_runtime *runtime;
1765         unsigned long flags;
1766
1767         if (PCM_RUNTIME_CHECK(substream))
1768                 return;
1769         runtime = substream->runtime;
1770
1771         if (runtime->transfer_ack_begin)
1772                 runtime->transfer_ack_begin(substream);
1773
1774         snd_pcm_stream_lock_irqsave(substream, flags);
1775         if (!snd_pcm_running(substream) ||
1776             snd_pcm_update_hw_ptr0(substream, 1) < 0)
1777                 goto _end;
1778
1779         if (substream->timer_running)
1780                 snd_timer_interrupt(substream->timer, 1);
1781  _end:
1782         snd_pcm_stream_unlock_irqrestore(substream, flags);
1783         if (runtime->transfer_ack_end)
1784                 runtime->transfer_ack_end(substream);
1785         kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1786 }
1787
1788 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1789
1790 /*
1791  * Wait until avail_min data becomes available
1792  * Returns a negative error code if any error occurs during operation.
1793  * The available space is stored on availp.  When err = 0 and avail = 0
1794  * on the capture stream, it indicates the stream is in DRAINING state.
1795  */
1796 static int wait_for_avail(struct snd_pcm_substream *substream,
1797                               snd_pcm_uframes_t *availp)
1798 {
1799         struct snd_pcm_runtime *runtime = substream->runtime;
1800         int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1801         wait_queue_t wait;
1802         int err = 0;
1803         snd_pcm_uframes_t avail = 0;
1804         long wait_time, tout;
1805
1806         init_waitqueue_entry(&wait, current);
1807         set_current_state(TASK_INTERRUPTIBLE);
1808         add_wait_queue(&runtime->tsleep, &wait);
1809
1810         if (runtime->no_period_wakeup)
1811                 wait_time = MAX_SCHEDULE_TIMEOUT;
1812         else {
1813                 wait_time = 10;
1814                 if (runtime->rate) {
1815                         long t = runtime->period_size * 2 / runtime->rate;
1816                         wait_time = max(t, wait_time);
1817                 }
1818                 wait_time = msecs_to_jiffies(wait_time * 1000);
1819         }
1820
1821         for (;;) {
1822                 if (signal_pending(current)) {
1823                         err = -ERESTARTSYS;
1824                         break;
1825                 }
1826
1827                 /*
1828                  * We need to check if space became available already
1829                  * (and thus the wakeup happened already) first to close
1830                  * the race of space already having become available.
1831                  * This check must happen after been added to the waitqueue
1832                  * and having current state be INTERRUPTIBLE.
1833                  */
1834                 if (is_playback)
1835                         avail = snd_pcm_playback_avail(runtime);
1836                 else
1837                         avail = snd_pcm_capture_avail(runtime);
1838                 if (avail >= runtime->twake)
1839                         break;
1840                 snd_pcm_stream_unlock_irq(substream);
1841
1842                 tout = schedule_timeout(wait_time);
1843
1844                 snd_pcm_stream_lock_irq(substream);
1845                 set_current_state(TASK_INTERRUPTIBLE);
1846                 switch (runtime->status->state) {
1847                 case SNDRV_PCM_STATE_SUSPENDED:
1848                         err = -ESTRPIPE;
1849                         goto _endloop;
1850                 case SNDRV_PCM_STATE_XRUN:
1851                         err = -EPIPE;
1852                         goto _endloop;
1853                 case SNDRV_PCM_STATE_DRAINING:
1854                         if (is_playback)
1855                                 err = -EPIPE;
1856                         else
1857                                 avail = 0; /* indicate draining */
1858                         goto _endloop;
1859                 case SNDRV_PCM_STATE_OPEN:
1860                 case SNDRV_PCM_STATE_SETUP:
1861                 case SNDRV_PCM_STATE_DISCONNECTED:
1862                         err = -EBADFD;
1863                         goto _endloop;
1864                 }
1865                 if (!tout) {
1866                         snd_printd("%s write error (DMA or IRQ trouble?)\n",
1867                                    is_playback ? "playback" : "capture");
1868                         err = -EIO;
1869                         break;
1870                 }
1871         }
1872  _endloop:
1873         set_current_state(TASK_RUNNING);
1874         remove_wait_queue(&runtime->tsleep, &wait);
1875         *availp = avail;
1876         return err;
1877 }
1878
1879 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1880                                       unsigned int hwoff,
1881                                       unsigned long data, unsigned int off,
1882                                       snd_pcm_uframes_t frames)
1883 {
1884         struct snd_pcm_runtime *runtime = substream->runtime;
1885         int err;
1886         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1887         if (substream->ops->copy) {
1888                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1889                         return err;
1890         } else {
1891                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1892                 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1893                         return -EFAULT;
1894         }
1895         return 0;
1896 }
1897
1898 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1899                           unsigned long data, unsigned int off,
1900                           snd_pcm_uframes_t size);
1901
1902 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1903                                             unsigned long data,
1904                                             snd_pcm_uframes_t size,
1905                                             int nonblock,
1906                                             transfer_f transfer)
1907 {
1908         struct snd_pcm_runtime *runtime = substream->runtime;
1909         snd_pcm_uframes_t xfer = 0;
1910         snd_pcm_uframes_t offset = 0;
1911         snd_pcm_uframes_t avail;
1912         int err = 0;
1913
1914         if (size == 0)
1915                 return 0;
1916
1917         snd_pcm_stream_lock_irq(substream);
1918         switch (runtime->status->state) {
1919         case SNDRV_PCM_STATE_PREPARED:
1920         case SNDRV_PCM_STATE_RUNNING:
1921         case SNDRV_PCM_STATE_PAUSED:
1922                 break;
1923         case SNDRV_PCM_STATE_XRUN:
1924                 err = -EPIPE;
1925                 goto _end_unlock;
1926         case SNDRV_PCM_STATE_SUSPENDED:
1927                 err = -ESTRPIPE;
1928                 goto _end_unlock;
1929         default:
1930                 err = -EBADFD;
1931                 goto _end_unlock;
1932         }
1933
1934         runtime->twake = runtime->control->avail_min ? : 1;
1935         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1936                 snd_pcm_update_hw_ptr(substream);
1937         avail = snd_pcm_playback_avail(runtime);
1938         while (size > 0) {
1939                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1940                 snd_pcm_uframes_t cont;
1941                 if (!avail) {
1942                         if (nonblock) {
1943                                 err = -EAGAIN;
1944                                 goto _end_unlock;
1945                         }
1946                         runtime->twake = min_t(snd_pcm_uframes_t, size,
1947                                         runtime->control->avail_min ? : 1);
1948                         err = wait_for_avail(substream, &avail);
1949                         if (err < 0)
1950                                 goto _end_unlock;
1951                 }
1952                 frames = size > avail ? avail : size;
1953                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1954                 if (frames > cont)
1955                         frames = cont;
1956                 if (snd_BUG_ON(!frames)) {
1957                         runtime->twake = 0;
1958                         snd_pcm_stream_unlock_irq(substream);
1959                         return -EINVAL;
1960                 }
1961                 appl_ptr = runtime->control->appl_ptr;
1962                 appl_ofs = appl_ptr % runtime->buffer_size;
1963                 snd_pcm_stream_unlock_irq(substream);
1964                 err = transfer(substream, appl_ofs, data, offset, frames);
1965                 snd_pcm_stream_lock_irq(substream);
1966                 if (err < 0)
1967                         goto _end_unlock;
1968                 switch (runtime->status->state) {
1969                 case SNDRV_PCM_STATE_XRUN:
1970                         err = -EPIPE;
1971                         goto _end_unlock;
1972                 case SNDRV_PCM_STATE_SUSPENDED:
1973                         err = -ESTRPIPE;
1974                         goto _end_unlock;
1975                 default:
1976                         break;
1977                 }
1978                 appl_ptr += frames;
1979                 if (appl_ptr >= runtime->boundary)
1980                         appl_ptr -= runtime->boundary;
1981                 runtime->control->appl_ptr = appl_ptr;
1982                 if (substream->ops->ack)
1983                         substream->ops->ack(substream);
1984
1985                 offset += frames;
1986                 size -= frames;
1987                 xfer += frames;
1988                 avail -= frames;
1989                 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1990                     snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1991                         err = snd_pcm_start(substream);
1992                         if (err < 0)
1993                                 goto _end_unlock;
1994                 }
1995         }
1996  _end_unlock:
1997         runtime->twake = 0;
1998         if (xfer > 0 && err >= 0)
1999                 snd_pcm_update_state(substream, runtime);
2000         snd_pcm_stream_unlock_irq(substream);
2001         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2002 }
2003
2004 /* sanity-check for read/write methods */
2005 static int pcm_sanity_check(struct snd_pcm_substream *substream)
2006 {
2007         struct snd_pcm_runtime *runtime;
2008         if (PCM_RUNTIME_CHECK(substream))
2009                 return -ENXIO;
2010         runtime = substream->runtime;
2011         if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
2012                 return -EINVAL;
2013         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2014                 return -EBADFD;
2015         return 0;
2016 }
2017
2018 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
2019 {
2020         struct snd_pcm_runtime *runtime;
2021         int nonblock;
2022         int err;
2023
2024         err = pcm_sanity_check(substream);
2025         if (err < 0)
2026                 return err;
2027         runtime = substream->runtime;
2028         nonblock = !!(substream->f_flags & O_NONBLOCK);
2029
2030         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2031             runtime->channels > 1)
2032                 return -EINVAL;
2033         return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2034                                   snd_pcm_lib_write_transfer);
2035 }
2036
2037 EXPORT_SYMBOL(snd_pcm_lib_write);
2038
2039 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
2040                                        unsigned int hwoff,
2041                                        unsigned long data, unsigned int off,
2042                                        snd_pcm_uframes_t frames)
2043 {
2044         struct snd_pcm_runtime *runtime = substream->runtime;
2045         int err;
2046         void __user **bufs = (void __user **)data;
2047         int channels = runtime->channels;
2048         int c;
2049         if (substream->ops->copy) {
2050                 if (snd_BUG_ON(!substream->ops->silence))
2051                         return -EINVAL;
2052                 for (c = 0; c < channels; ++c, ++bufs) {
2053                         if (*bufs == NULL) {
2054                                 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2055                                         return err;
2056                         } else {
2057                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2058                                 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2059                                         return err;
2060                         }
2061                 }
2062         } else {
2063                 /* default transfer behaviour */
2064                 size_t dma_csize = runtime->dma_bytes / channels;
2065                 for (c = 0; c < channels; ++c, ++bufs) {
2066                         char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2067                         if (*bufs == NULL) {
2068                                 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2069                         } else {
2070                                 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2071                                 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2072                                         return -EFAULT;
2073                         }
2074                 }
2075         }
2076         return 0;
2077 }
2078
2079 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
2080                                      void __user **bufs,
2081                                      snd_pcm_uframes_t frames)
2082 {
2083         struct snd_pcm_runtime *runtime;
2084         int nonblock;
2085         int err;
2086
2087         err = pcm_sanity_check(substream);
2088         if (err < 0)
2089                 return err;
2090         runtime = substream->runtime;
2091         nonblock = !!(substream->f_flags & O_NONBLOCK);
2092
2093         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2094                 return -EINVAL;
2095         return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2096                                   nonblock, snd_pcm_lib_writev_transfer);
2097 }
2098
2099 EXPORT_SYMBOL(snd_pcm_lib_writev);
2100
2101 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
2102                                      unsigned int hwoff,
2103                                      unsigned long data, unsigned int off,
2104                                      snd_pcm_uframes_t frames)
2105 {
2106         struct snd_pcm_runtime *runtime = substream->runtime;
2107         int err;
2108         char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2109         if (substream->ops->copy) {
2110                 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2111                         return err;
2112         } else {
2113                 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2114                 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2115                         return -EFAULT;
2116         }
2117         return 0;
2118 }
2119
2120 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
2121                                            unsigned long data,
2122                                            snd_pcm_uframes_t size,
2123                                            int nonblock,
2124                                            transfer_f transfer)
2125 {
2126         struct snd_pcm_runtime *runtime = substream->runtime;
2127         snd_pcm_uframes_t xfer = 0;
2128         snd_pcm_uframes_t offset = 0;
2129         snd_pcm_uframes_t avail;
2130         int err = 0;
2131
2132         if (size == 0)
2133                 return 0;
2134
2135         snd_pcm_stream_lock_irq(substream);
2136         switch (runtime->status->state) {
2137         case SNDRV_PCM_STATE_PREPARED:
2138                 if (size >= runtime->start_threshold) {
2139                         err = snd_pcm_start(substream);
2140                         if (err < 0)
2141                                 goto _end_unlock;
2142                 }
2143                 break;
2144         case SNDRV_PCM_STATE_DRAINING:
2145         case SNDRV_PCM_STATE_RUNNING:
2146         case SNDRV_PCM_STATE_PAUSED:
2147                 break;
2148         case SNDRV_PCM_STATE_XRUN:
2149                 err = -EPIPE;
2150                 goto _end_unlock;
2151         case SNDRV_PCM_STATE_SUSPENDED:
2152                 err = -ESTRPIPE;
2153                 goto _end_unlock;
2154         default:
2155                 err = -EBADFD;
2156                 goto _end_unlock;
2157         }
2158
2159         runtime->twake = runtime->control->avail_min ? : 1;
2160         if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2161                 snd_pcm_update_hw_ptr(substream);
2162         avail = snd_pcm_capture_avail(runtime);
2163         while (size > 0) {
2164                 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2165                 snd_pcm_uframes_t cont;
2166                 if (!avail) {
2167                         if (runtime->status->state ==
2168                             SNDRV_PCM_STATE_DRAINING) {
2169                                 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2170                                 goto _end_unlock;
2171                         }
2172                         if (nonblock) {
2173                                 err = -EAGAIN;
2174                                 goto _end_unlock;
2175                         }
2176                         runtime->twake = min_t(snd_pcm_uframes_t, size,
2177                                         runtime->control->avail_min ? : 1);
2178                         err = wait_for_avail(substream, &avail);
2179                         if (err < 0)
2180                                 goto _end_unlock;
2181                         if (!avail)
2182                                 continue; /* draining */
2183                 }
2184                 frames = size > avail ? avail : size;
2185                 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2186                 if (frames > cont)
2187                         frames = cont;
2188                 if (snd_BUG_ON(!frames)) {
2189                         runtime->twake = 0;
2190                         snd_pcm_stream_unlock_irq(substream);
2191                         return -EINVAL;
2192                 }
2193                 appl_ptr = runtime->control->appl_ptr;
2194                 appl_ofs = appl_ptr % runtime->buffer_size;
2195                 snd_pcm_stream_unlock_irq(substream);
2196                 err = transfer(substream, appl_ofs, data, offset, frames);
2197                 snd_pcm_stream_lock_irq(substream);
2198                 if (err < 0)
2199                         goto _end_unlock;
2200                 switch (runtime->status->state) {
2201                 case SNDRV_PCM_STATE_XRUN:
2202                         err = -EPIPE;
2203                         goto _end_unlock;
2204                 case SNDRV_PCM_STATE_SUSPENDED:
2205                         err = -ESTRPIPE;
2206                         goto _end_unlock;
2207                 default:
2208                         break;
2209                 }
2210                 appl_ptr += frames;
2211                 if (appl_ptr >= runtime->boundary)
2212                         appl_ptr -= runtime->boundary;
2213                 runtime->control->appl_ptr = appl_ptr;
2214                 if (substream->ops->ack)
2215                         substream->ops->ack(substream);
2216
2217                 offset += frames;
2218                 size -= frames;
2219                 xfer += frames;
2220                 avail -= frames;
2221         }
2222  _end_unlock:
2223         runtime->twake = 0;
2224         if (xfer > 0 && err >= 0)
2225                 snd_pcm_update_state(substream, runtime);
2226         snd_pcm_stream_unlock_irq(substream);
2227         return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2228 }
2229
2230 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2231 {
2232         struct snd_pcm_runtime *runtime;
2233         int nonblock;
2234         int err;
2235
2236         err = pcm_sanity_check(substream);
2237         if (err < 0)
2238                 return err;
2239         runtime = substream->runtime;
2240         nonblock = !!(substream->f_flags & O_NONBLOCK);
2241         if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2242                 return -EINVAL;
2243         return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2244 }
2245
2246 EXPORT_SYMBOL(snd_pcm_lib_read);
2247
2248 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2249                                       unsigned int hwoff,
2250                                       unsigned long data, unsigned int off,
2251                                       snd_pcm_uframes_t frames)
2252 {
2253         struct snd_pcm_runtime *runtime = substream->runtime;
2254         int err;
2255         void __user **bufs = (void __user **)data;
2256         int channels = runtime->channels;
2257         int c;
2258         if (substream->ops->copy) {
2259                 for (c = 0; c < channels; ++c, ++bufs) {
2260                         char __user *buf;
2261                         if (*bufs == NULL)
2262                                 continue;
2263                         buf = *bufs + samples_to_bytes(runtime, off);
2264                         if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2265                                 return err;
2266                 }
2267         } else {
2268                 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2269                 for (c = 0; c < channels; ++c, ++bufs) {
2270                         char *hwbuf;
2271                         char __user *buf;
2272                         if (*bufs == NULL)
2273                                 continue;
2274
2275                         hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2276                         buf = *bufs + samples_to_bytes(runtime, off);
2277                         if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2278                                 return -EFAULT;
2279                 }
2280         }
2281         return 0;
2282 }
2283
2284 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2285                                     void __user **bufs,
2286                                     snd_pcm_uframes_t frames)
2287 {
2288         struct snd_pcm_runtime *runtime;
2289         int nonblock;
2290         int err;
2291
2292         err = pcm_sanity_check(substream);
2293         if (err < 0)
2294                 return err;
2295         runtime = substream->runtime;
2296         if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2297                 return -EBADFD;
2298
2299         nonblock = !!(substream->f_flags & O_NONBLOCK);
2300         if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2301                 return -EINVAL;
2302         return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2303 }
2304
2305 EXPORT_SYMBOL(snd_pcm_lib_readv);
2306
2307 /*
2308  * standard channel mapping helpers
2309  */
2310
2311 /* default channel maps for multi-channel playbacks, up to 8 channels */
2312 const struct snd_pcm_chmap_elem snd_pcm_std_chmaps[] = {
2313         { .channels = 1,
2314           .map = { SNDRV_CHMAP_MONO } },
2315         { .channels = 2,
2316           .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2317         { .channels = 4,
2318           .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2319                    SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2320         { .channels = 6,
2321           .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2322                    SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2323                    SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE } },
2324         { .channels = 8,
2325           .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2326                    SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2327                    SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2328                    SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2329         { }
2330 };
2331 EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps);
2332
2333 /* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2334 const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps[] = {
2335         { .channels = 1,
2336           .map = { SNDRV_CHMAP_MONO } },
2337         { .channels = 2,
2338           .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR } },
2339         { .channels = 4,
2340           .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2341                    SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2342         { .channels = 6,
2343           .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2344                    SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2345                    SNDRV_CHMAP_RL, SNDRV_CHMAP_RR } },
2346         { .channels = 8,
2347           .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
2348                    SNDRV_CHMAP_FC, SNDRV_CHMAP_LFE,
2349                    SNDRV_CHMAP_RL, SNDRV_CHMAP_RR,
2350                    SNDRV_CHMAP_SL, SNDRV_CHMAP_SR } },
2351         { }
2352 };
2353 EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps);
2354
2355 static bool valid_chmap_channels(const struct snd_pcm_chmap *info, int ch)
2356 {
2357         if (ch > info->max_channels)
2358                 return false;
2359         return !info->channel_mask || (info->channel_mask & (1U << ch));
2360 }
2361
2362 static int pcm_chmap_ctl_info(struct snd_kcontrol *kcontrol,
2363                               struct snd_ctl_elem_info *uinfo)
2364 {
2365         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2366
2367         uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
2368         uinfo->count = 0;
2369         uinfo->count = info->max_channels;
2370         uinfo->value.integer.min = 0;
2371         uinfo->value.integer.max = SNDRV_CHMAP_LAST;
2372         return 0;
2373 }
2374
2375 /* get callback for channel map ctl element
2376  * stores the channel position firstly matching with the current channels
2377  */
2378 static int pcm_chmap_ctl_get(struct snd_kcontrol *kcontrol,
2379                              struct snd_ctl_elem_value *ucontrol)
2380 {
2381         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2382         unsigned int idx = snd_ctl_get_ioffidx(kcontrol, &ucontrol->id);
2383         struct snd_pcm_substream *substream;
2384         const struct snd_pcm_chmap_elem *map;
2385
2386         if (snd_BUG_ON(!info->chmap))
2387                 return -EINVAL;
2388         substream = snd_pcm_chmap_substream(info, idx);
2389         if (!substream)
2390                 return -ENODEV;
2391         memset(ucontrol->value.integer.value, 0,
2392                sizeof(ucontrol->value.integer.value));
2393         if (!substream->runtime)
2394                 return 0; /* no channels set */
2395         for (map = info->chmap; map->channels; map++) {
2396                 int i;
2397                 if (map->channels == substream->runtime->channels &&
2398                     valid_chmap_channels(info, map->channels)) {
2399                         for (i = 0; i < map->channels; i++)
2400                                 ucontrol->value.integer.value[i] = map->map[i];
2401                         return 0;
2402                 }
2403         }
2404         return -EINVAL;
2405 }
2406
2407 /* tlv callback for channel map ctl element
2408  * expands the pre-defined channel maps in a form of TLV
2409  */
2410 static int pcm_chmap_ctl_tlv(struct snd_kcontrol *kcontrol, int op_flag,
2411                              unsigned int size, unsigned int __user *tlv)
2412 {
2413         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2414         const struct snd_pcm_chmap_elem *map;
2415         unsigned int __user *dst;
2416         int c, count = 0;
2417
2418         if (snd_BUG_ON(!info->chmap))
2419                 return -EINVAL;
2420         if (size < 8)
2421                 return -ENOMEM;
2422         if (put_user(SNDRV_CTL_TLVT_CONTAINER, tlv))
2423                 return -EFAULT;
2424         size -= 8;
2425         dst = tlv + 2;
2426         for (map = info->chmap; map->channels; map++) {
2427                 int chs_bytes = map->channels * 4;
2428                 if (!valid_chmap_channels(info, map->channels))
2429                         continue;
2430                 if (size < 8)
2431                         return -ENOMEM;
2432                 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED, dst) ||
2433                     put_user(chs_bytes, dst + 1))
2434                         return -EFAULT;
2435                 dst += 2;
2436                 size -= 8;
2437                 count += 8;
2438                 if (size < chs_bytes)
2439                         return -ENOMEM;
2440                 size -= chs_bytes;
2441                 count += chs_bytes;
2442                 for (c = 0; c < map->channels; c++) {
2443                         if (put_user(map->map[c], dst))
2444                                 return -EFAULT;
2445                         dst++;
2446                 }
2447         }
2448         if (put_user(count, tlv + 1))
2449                 return -EFAULT;
2450         return 0;
2451 }
2452
2453 static void pcm_chmap_ctl_private_free(struct snd_kcontrol *kcontrol)
2454 {
2455         struct snd_pcm_chmap *info = snd_kcontrol_chip(kcontrol);
2456         info->pcm->streams[info->stream].chmap_kctl = NULL;
2457         kfree(info);
2458 }
2459
2460 /**
2461  * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2462  * @pcm: the assigned PCM instance
2463  * @stream: stream direction
2464  * @chmap: channel map elements (for query)
2465  * @max_channels: the max number of channels for the stream
2466  * @private_value: the value passed to each kcontrol's private_value field
2467  * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2468  *
2469  * Create channel-mapping control elements assigned to the given PCM stream(s).
2470  * Returns zero if succeed, or a negative error value.
2471  */
2472 int snd_pcm_add_chmap_ctls(struct snd_pcm *pcm, int stream,
2473                            const struct snd_pcm_chmap_elem *chmap,
2474                            int max_channels,
2475                            unsigned long private_value,
2476                            struct snd_pcm_chmap **info_ret)
2477 {
2478         struct snd_pcm_chmap *info;
2479         struct snd_kcontrol_new knew = {
2480                 .iface = SNDRV_CTL_ELEM_IFACE_PCM,
2481                 .access = SNDRV_CTL_ELEM_ACCESS_READ |
2482                         SNDRV_CTL_ELEM_ACCESS_TLV_READ |
2483                         SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK,
2484                 .info = pcm_chmap_ctl_info,
2485                 .get = pcm_chmap_ctl_get,
2486                 .tlv.c = pcm_chmap_ctl_tlv,
2487         };
2488         int err;
2489
2490         info = kzalloc(sizeof(*info), GFP_KERNEL);
2491         if (!info)
2492                 return -ENOMEM;
2493         info->pcm = pcm;
2494         info->stream = stream;
2495         info->chmap = chmap;
2496         info->max_channels = max_channels;
2497         if (stream == SNDRV_PCM_STREAM_PLAYBACK)
2498                 knew.name = "Playback Channel Map";
2499         else
2500                 knew.name = "Capture Channel Map";
2501         knew.device = pcm->device;
2502         knew.count = pcm->streams[stream].substream_count;
2503         knew.private_value = private_value;
2504         info->kctl = snd_ctl_new1(&knew, info);
2505         if (!info->kctl) {
2506                 kfree(info);
2507                 return -ENOMEM;
2508         }
2509         info->kctl->private_free = pcm_chmap_ctl_private_free;
2510         err = snd_ctl_add(pcm->card, info->kctl);
2511         if (err < 0)
2512                 return err;
2513         pcm->streams[stream].chmap_kctl = info->kctl;
2514         if (info_ret)
2515                 *info_ret = info;
2516         return 0;
2517 }
2518 EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls);