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Linux v2.6.13-rc3
[pohmelfs.git] / sound / core / pcm_lib.c
blobc5bfd0918cff9eba195d733355435580f27f8882
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
24 #include <linux/slab.h>
25 #include <linux/time.h>
26 #include <sound/core.h>
27 #include <sound/control.h>
28 #include <sound/info.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/timer.h>
32
33 /*
34 * fill ring buffer with silence
35 * runtime->silence_start: starting pointer to silence area
36 * runtime->silence_filled: size filled with silence
37 * runtime->silence_threshold: threshold from application
38 * runtime->silence_size: maximal size from application
39 *
40 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
41 */
42 void snd_pcm_playback_silence(snd_pcm_substream_t *substream, snd_pcm_uframes_t new_hw_ptr)
43 {
44 snd_pcm_runtime_t *runtime = substream->runtime;
45 snd_pcm_uframes_t frames, ofs, transfer;
46
47 if (runtime->silence_size < runtime->boundary) {
48 snd_pcm_sframes_t noise_dist, n;
49 if (runtime->silence_start != runtime->control->appl_ptr) {
50 n = runtime->control->appl_ptr - runtime->silence_start;
51 if (n < 0)
52 n += runtime->boundary;
53 if ((snd_pcm_uframes_t)n < runtime->silence_filled)
54 runtime->silence_filled -= n;
55 else
56 runtime->silence_filled = 0;
57 runtime->silence_start = runtime->control->appl_ptr;
58 }
59 if (runtime->silence_filled == runtime->buffer_size)
60 return;
61 snd_assert(runtime->silence_filled <= runtime->buffer_size, return);
62 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
63 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
64 return;
65 frames = runtime->silence_threshold - noise_dist;
66 if (frames > runtime->silence_size)
67 frames = runtime->silence_size;
68 } else {
69 if (new_hw_ptr == ULONG_MAX) { /* initialization */
70 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
71 runtime->silence_filled = avail > 0 ? avail : 0;
72 runtime->silence_start = (runtime->status->hw_ptr +
73 runtime->silence_filled) %
74 runtime->boundary;
75 } else {
76 ofs = runtime->status->hw_ptr;
77 frames = new_hw_ptr - ofs;
78 if ((snd_pcm_sframes_t)frames < 0)
79 frames += runtime->boundary;
80 runtime->silence_filled -= frames;
81 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
82 runtime->silence_filled = 0;
83 runtime->silence_start = (ofs + frames) - runtime->buffer_size;
84 } else {
85 runtime->silence_start = ofs - runtime->silence_filled;
86 }
87 if ((snd_pcm_sframes_t)runtime->silence_start < 0)
88 runtime->silence_start += runtime->boundary;
89 }
90 frames = runtime->buffer_size - runtime->silence_filled;
91 }
92 snd_assert(frames <= runtime->buffer_size, return);
93 if (frames == 0)
94 return;
95 ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size;
96 while (frames > 0) {
97 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
98 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
99 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
100 if (substream->ops->silence) {
101 int err;
102 err = substream->ops->silence(substream, -1, ofs, transfer);
103 snd_assert(err >= 0, );
104 } else {
105 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
106 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
107 }
108 } else {
109 unsigned int c;
110 unsigned int channels = runtime->channels;
111 if (substream->ops->silence) {
112 for (c = 0; c < channels; ++c) {
113 int err;
114 err = substream->ops->silence(substream, c, ofs, transfer);
115 snd_assert(err >= 0, );
116 }
117 } else {
118 size_t dma_csize = runtime->dma_bytes / channels;
119 for (c = 0; c < channels; ++c) {
120 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
121 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
122 }
123 }
124 }
125 runtime->silence_filled += transfer;
126 frames -= transfer;
127 ofs = 0;
128 }
129 }
130
131 static void xrun(snd_pcm_substream_t *substream)
132 {
133 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
134 #ifdef CONFIG_SND_DEBUG
135 if (substream->pstr->xrun_debug) {
136 snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n",
137 substream->pcm->card->number,
138 substream->pcm->device,
139 substream->stream ? 'c' : 'p');
140 if (substream->pstr->xrun_debug > 1)
141 dump_stack();
142 }
143 #endif
144 }
145
146 static inline snd_pcm_uframes_t snd_pcm_update_hw_ptr_pos(snd_pcm_substream_t *substream,
147 snd_pcm_runtime_t *runtime)
148 {
149 snd_pcm_uframes_t pos;
150
151 pos = substream->ops->pointer(substream);
152 if (pos == SNDRV_PCM_POS_XRUN)
153 return pos; /* XRUN */
154 if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP)
155 snd_timestamp_now((snd_timestamp_t*)&runtime->status->tstamp, runtime->tstamp_timespec);
156 #ifdef CONFIG_SND_DEBUG
157 if (pos >= runtime->buffer_size) {
158 snd_printk(KERN_ERR "BUG: stream = %i, pos = 0x%lx, buffer size = 0x%lx, period size = 0x%lx\n", substream->stream, pos, runtime->buffer_size, runtime->period_size);
159 } else
160 #endif
161 snd_runtime_check(pos < runtime->buffer_size, return 0);
162 pos -= pos % runtime->min_align;
163 return pos;
164 }
165
166 static inline int snd_pcm_update_hw_ptr_post(snd_pcm_substream_t *substream,
167 snd_pcm_runtime_t *runtime)
168 {
169 snd_pcm_uframes_t avail;
170
171 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
172 avail = snd_pcm_playback_avail(runtime);
173 else
174 avail = snd_pcm_capture_avail(runtime);
175 if (avail > runtime->avail_max)
176 runtime->avail_max = avail;
177 if (avail >= runtime->stop_threshold) {
178 if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
179 snd_pcm_drain_done(substream);
180 else
181 xrun(substream);
182 return -EPIPE;
183 }
184 if (avail >= runtime->control->avail_min)
185 wake_up(&runtime->sleep);
186 return 0;
187 }
188
189 static inline int snd_pcm_update_hw_ptr_interrupt(snd_pcm_substream_t *substream)
190 {
191 snd_pcm_runtime_t *runtime = substream->runtime;
192 snd_pcm_uframes_t pos;
193 snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt;
194 snd_pcm_sframes_t delta;
195
196 pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
197 if (pos == SNDRV_PCM_POS_XRUN) {
198 xrun(substream);
199 return -EPIPE;
200 }
201 if (runtime->period_size == runtime->buffer_size)
202 goto __next_buf;
203 new_hw_ptr = runtime->hw_ptr_base + pos;
204 hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
205
206 delta = hw_ptr_interrupt - new_hw_ptr;
207 if (delta > 0) {
208 if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
209 #ifdef CONFIG_SND_DEBUG
210 if (runtime->periods > 1 && substream->pstr->xrun_debug) {
211 snd_printd(KERN_ERR "Unexpected hw_pointer value [1] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2);
212 if (substream->pstr->xrun_debug > 1)
213 dump_stack();
214 }
215 #endif
216 return 0;
217 }
218 __next_buf:
219 runtime->hw_ptr_base += runtime->buffer_size;
220 if (runtime->hw_ptr_base == runtime->boundary)
221 runtime->hw_ptr_base = 0;
222 new_hw_ptr = runtime->hw_ptr_base + pos;
223 }
224
225 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
226 runtime->silence_size > 0)
227 snd_pcm_playback_silence(substream, new_hw_ptr);
228
229 runtime->status->hw_ptr = new_hw_ptr;
230 runtime->hw_ptr_interrupt = new_hw_ptr - new_hw_ptr % runtime->period_size;
231
232 return snd_pcm_update_hw_ptr_post(substream, runtime);
233 }
234
235 /* CAUTION: call it with irq disabled */
236 int snd_pcm_update_hw_ptr(snd_pcm_substream_t *substream)
237 {
238 snd_pcm_runtime_t *runtime = substream->runtime;
239 snd_pcm_uframes_t pos;
240 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr;
241 snd_pcm_sframes_t delta;
242
243 old_hw_ptr = runtime->status->hw_ptr;
244 pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
245 if (pos == SNDRV_PCM_POS_XRUN) {
246 xrun(substream);
247 return -EPIPE;
248 }
249 new_hw_ptr = runtime->hw_ptr_base + pos;
250
251 delta = old_hw_ptr - new_hw_ptr;
252 if (delta > 0) {
253 if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
254 #ifdef CONFIG_SND_DEBUG
255 if (runtime->periods > 2 && substream->pstr->xrun_debug) {
256 snd_printd(KERN_ERR "Unexpected hw_pointer value [2] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2);
257 if (substream->pstr->xrun_debug > 1)
258 dump_stack();
259 }
260 #endif
261 return 0;
262 }
263 runtime->hw_ptr_base += runtime->buffer_size;
264 if (runtime->hw_ptr_base == runtime->boundary)
265 runtime->hw_ptr_base = 0;
266 new_hw_ptr = runtime->hw_ptr_base + pos;
267 }
268 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
269 runtime->silence_size > 0)
270 snd_pcm_playback_silence(substream, new_hw_ptr);
271
272 runtime->status->hw_ptr = new_hw_ptr;
273
274 return snd_pcm_update_hw_ptr_post(substream, runtime);
275 }
276
277 /**
278 * snd_pcm_set_ops - set the PCM operators
279 * @pcm: the pcm instance
280 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
281 * @ops: the operator table
282 *
283 * Sets the given PCM operators to the pcm instance.
284 */
285 void snd_pcm_set_ops(snd_pcm_t *pcm, int direction, snd_pcm_ops_t *ops)
286 {
287 snd_pcm_str_t *stream = &pcm->streams[direction];
288 snd_pcm_substream_t *substream;
289
290 for (substream = stream->substream; substream != NULL; substream = substream->next)
291 substream->ops = ops;
292 }
293
294
295 /**
296 * snd_pcm_sync - set the PCM sync id
297 * @substream: the pcm substream
298 *
299 * Sets the PCM sync identifier for the card.
300 */
301 void snd_pcm_set_sync(snd_pcm_substream_t * substream)
302 {
303 snd_pcm_runtime_t *runtime = substream->runtime;
304
305 runtime->sync.id32[0] = substream->pcm->card->number;
306 runtime->sync.id32[1] = -1;
307 runtime->sync.id32[2] = -1;
308 runtime->sync.id32[3] = -1;
309 }
310
311 /*
312 * Standard ioctl routine
313 */
314
315 /* Code taken from alsa-lib */
316 #define assert(a) snd_assert((a), return -EINVAL)
317
318 static inline unsigned int div32(unsigned int a, unsigned int b,
319 unsigned int *r)
320 {
321 if (b == 0) {
322 *r = 0;
323 return UINT_MAX;
324 }
325 *r = a % b;
326 return a / b;
327 }
328
329 static inline unsigned int div_down(unsigned int a, unsigned int b)
330 {
331 if (b == 0)
332 return UINT_MAX;
333 return a / b;
334 }
335
336 static inline unsigned int div_up(unsigned int a, unsigned int b)
337 {
338 unsigned int r;
339 unsigned int q;
340 if (b == 0)
341 return UINT_MAX;
342 q = div32(a, b, &r);
343 if (r)
344 ++q;
345 return q;
346 }
347
348 static inline unsigned int mul(unsigned int a, unsigned int b)
349 {
350 if (a == 0)
351 return 0;
352 if (div_down(UINT_MAX, a) < b)
353 return UINT_MAX;
354 return a * b;
355 }
356
357 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
358 unsigned int c, unsigned int *r)
359 {
360 u_int64_t n = (u_int64_t) a * b;
361 if (c == 0) {
362 snd_assert(n > 0, );
363 *r = 0;
364 return UINT_MAX;
365 }
366 div64_32(&n, c, r);
367 if (n >= UINT_MAX) {
368 *r = 0;
369 return UINT_MAX;
370 }
371 return n;
372 }
373
374 static int snd_interval_refine_min(snd_interval_t *i, unsigned int min, int openmin)
375 {
376 int changed = 0;
377 assert(!snd_interval_empty(i));
378 if (i->min < min) {
379 i->min = min;
380 i->openmin = openmin;
381 changed = 1;
382 } else if (i->min == min && !i->openmin && openmin) {
383 i->openmin = 1;
384 changed = 1;
385 }
386 if (i->integer) {
387 if (i->openmin) {
388 i->min++;
389 i->openmin = 0;
390 }
391 }
392 if (snd_interval_checkempty(i)) {
393 snd_interval_none(i);
394 return -EINVAL;
395 }
396 return changed;
397 }
398
399 static int snd_interval_refine_max(snd_interval_t *i, unsigned int max, int openmax)
400 {
401 int changed = 0;
402 assert(!snd_interval_empty(i));
403 if (i->max > max) {
404 i->max = max;
405 i->openmax = openmax;
406 changed = 1;
407 } else if (i->max == max && !i->openmax && openmax) {
408 i->openmax = 1;
409 changed = 1;
410 }
411 if (i->integer) {
412 if (i->openmax) {
413 i->max--;
414 i->openmax = 0;
415 }
416 }
417 if (snd_interval_checkempty(i)) {
418 snd_interval_none(i);
419 return -EINVAL;
420 }
421 return changed;
422 }
423
424 /**
425 * snd_interval_refine - refine the interval value of configurator
426 * @i: the interval value to refine
427 * @v: the interval value to refer to
428 *
429 * Refines the interval value with the reference value.
430 * The interval is changed to the range satisfying both intervals.
431 * The interval status (min, max, integer, etc.) are evaluated.
432 *
433 * Returns non-zero if the value is changed, zero if not changed.
434 */
435 int snd_interval_refine(snd_interval_t *i, const snd_interval_t *v)
436 {
437 int changed = 0;
438 assert(!snd_interval_empty(i));
439 if (i->min < v->min) {
440 i->min = v->min;
441 i->openmin = v->openmin;
442 changed = 1;
443 } else if (i->min == v->min && !i->openmin && v->openmin) {
444 i->openmin = 1;
445 changed = 1;
446 }
447 if (i->max > v->max) {
448 i->max = v->max;
449 i->openmax = v->openmax;
450 changed = 1;
451 } else if (i->max == v->max && !i->openmax && v->openmax) {
452 i->openmax = 1;
453 changed = 1;
454 }
455 if (!i->integer && v->integer) {
456 i->integer = 1;
457 changed = 1;
458 }
459 if (i->integer) {
460 if (i->openmin) {
461 i->min++;
462 i->openmin = 0;
463 }
464 if (i->openmax) {
465 i->max--;
466 i->openmax = 0;
467 }
468 } else if (!i->openmin && !i->openmax && i->min == i->max)
469 i->integer = 1;
470 if (snd_interval_checkempty(i)) {
471 snd_interval_none(i);
472 return -EINVAL;
473 }
474 return changed;
475 }
476
477 static int snd_interval_refine_first(snd_interval_t *i)
478 {
479 assert(!snd_interval_empty(i));
480 if (snd_interval_single(i))
481 return 0;
482 i->max = i->min;
483 i->openmax = i->openmin;
484 if (i->openmax)
485 i->max++;
486 return 1;
487 }
488
489 static int snd_interval_refine_last(snd_interval_t *i)
490 {
491 assert(!snd_interval_empty(i));
492 if (snd_interval_single(i))
493 return 0;
494 i->min = i->max;
495 i->openmin = i->openmax;
496 if (i->openmin)
497 i->min--;
498 return 1;
499 }
500
501 static int snd_interval_refine_set(snd_interval_t *i, unsigned int val)
502 {
503 snd_interval_t t;
504 t.empty = 0;
505 t.min = t.max = val;
506 t.openmin = t.openmax = 0;
507 t.integer = 1;
508 return snd_interval_refine(i, &t);
509 }
510
511 void snd_interval_mul(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c)
512 {
513 if (a->empty || b->empty) {
514 snd_interval_none(c);
515 return;
516 }
517 c->empty = 0;
518 c->min = mul(a->min, b->min);
519 c->openmin = (a->openmin || b->openmin);
520 c->max = mul(a->max, b->max);
521 c->openmax = (a->openmax || b->openmax);
522 c->integer = (a->integer && b->integer);
523 }
524
525 /**
526 * snd_interval_div - refine the interval value with division
527 *
528 * c = a / b
529 *
530 * Returns non-zero if the value is changed, zero if not changed.
531 */
532 void snd_interval_div(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c)
533 {
534 unsigned int r;
535 if (a->empty || b->empty) {
536 snd_interval_none(c);
537 return;
538 }
539 c->empty = 0;
540 c->min = div32(a->min, b->max, &r);
541 c->openmin = (r || a->openmin || b->openmax);
542 if (b->min > 0) {
543 c->max = div32(a->max, b->min, &r);
544 if (r) {
545 c->max++;
546 c->openmax = 1;
547 } else
548 c->openmax = (a->openmax || b->openmin);
549 } else {
550 c->max = UINT_MAX;
551 c->openmax = 0;
552 }
553 c->integer = 0;
554 }
555
556 /**
557 * snd_interval_muldivk - refine the interval value
558 *
559 * c = a * b / k
560 *
561 * Returns non-zero if the value is changed, zero if not changed.
562 */
563 void snd_interval_muldivk(const snd_interval_t *a, const snd_interval_t *b,
564 unsigned int k, snd_interval_t *c)
565 {
566 unsigned int r;
567 if (a->empty || b->empty) {
568 snd_interval_none(c);
569 return;
570 }
571 c->empty = 0;
572 c->min = muldiv32(a->min, b->min, k, &r);
573 c->openmin = (r || a->openmin || b->openmin);
574 c->max = muldiv32(a->max, b->max, k, &r);
575 if (r) {
576 c->max++;
577 c->openmax = 1;
578 } else
579 c->openmax = (a->openmax || b->openmax);
580 c->integer = 0;
581 }
582
583 /**
584 * snd_interval_mulkdiv - refine the interval value
585 *
586 * c = a * k / b
587 *
588 * Returns non-zero if the value is changed, zero if not changed.
589 */
590 void snd_interval_mulkdiv(const snd_interval_t *a, unsigned int k,
591 const snd_interval_t *b, snd_interval_t *c)
592 {
593 unsigned int r;
594 if (a->empty || b->empty) {
595 snd_interval_none(c);
596 return;
597 }
598 c->empty = 0;
599 c->min = muldiv32(a->min, k, b->max, &r);
600 c->openmin = (r || a->openmin || b->openmax);
601 if (b->min > 0) {
602 c->max = muldiv32(a->max, k, b->min, &r);
603 if (r) {
604 c->max++;
605 c->openmax = 1;
606 } else
607 c->openmax = (a->openmax || b->openmin);
608 } else {
609 c->max = UINT_MAX;
610 c->openmax = 0;
611 }
612 c->integer = 0;
613 }
614
615 #undef assert
616 /* ---- */
617
618
619 /**
620 * snd_interval_ratnum - refine the interval value
621 *
622 * Returns non-zero if the value is changed, zero if not changed.
623 */
624 int snd_interval_ratnum(snd_interval_t *i,
625 unsigned int rats_count, ratnum_t *rats,
626 unsigned int *nump, unsigned int *denp)
627 {
628 unsigned int best_num, best_diff, best_den;
629 unsigned int k;
630 snd_interval_t t;
631 int err;
632
633 best_num = best_den = best_diff = 0;
634 for (k = 0; k < rats_count; ++k) {
635 unsigned int num = rats[k].num;
636 unsigned int den;
637 unsigned int q = i->min;
638 int diff;
639 if (q == 0)
640 q = 1;
641 den = div_down(num, q);
642 if (den < rats[k].den_min)
643 continue;
644 if (den > rats[k].den_max)
645 den = rats[k].den_max;
646 else {
647 unsigned int r;
648 r = (den - rats[k].den_min) % rats[k].den_step;
649 if (r != 0)
650 den -= r;
651 }
652 diff = num - q * den;
653 if (best_num == 0 ||
654 diff * best_den < best_diff * den) {
655 best_diff = diff;
656 best_den = den;
657 best_num = num;
658 }
659 }
660 if (best_den == 0) {
661 i->empty = 1;
662 return -EINVAL;
663 }
664 t.min = div_down(best_num, best_den);
665 t.openmin = !!(best_num % best_den);
666
667 best_num = best_den = best_diff = 0;
668 for (k = 0; k < rats_count; ++k) {
669 unsigned int num = rats[k].num;
670 unsigned int den;
671 unsigned int q = i->max;
672 int diff;
673 if (q == 0) {
674 i->empty = 1;
675 return -EINVAL;
676 }
677 den = div_up(num, q);
678 if (den > rats[k].den_max)
679 continue;
680 if (den < rats[k].den_min)
681 den = rats[k].den_min;
682 else {
683 unsigned int r;
684 r = (den - rats[k].den_min) % rats[k].den_step;
685 if (r != 0)
686 den += rats[k].den_step - r;
687 }
688 diff = q * den - num;
689 if (best_num == 0 ||
690 diff * best_den < best_diff * den) {
691 best_diff = diff;
692 best_den = den;
693 best_num = num;
694 }
695 }
696 if (best_den == 0) {
697 i->empty = 1;
698 return -EINVAL;
699 }
700 t.max = div_up(best_num, best_den);
701 t.openmax = !!(best_num % best_den);
702 t.integer = 0;
703 err = snd_interval_refine(i, &t);
704 if (err < 0)
705 return err;
706
707 if (snd_interval_single(i)) {
708 if (nump)
709 *nump = best_num;
710 if (denp)
711 *denp = best_den;
712 }
713 return err;
714 }
715
716 /**
717 * snd_interval_ratden - refine the interval value
718 *
719 * Returns non-zero if the value is changed, zero if not changed.
720 */
721 static int snd_interval_ratden(snd_interval_t *i,
722 unsigned int rats_count, ratden_t *rats,
723 unsigned int *nump, unsigned int *denp)
724 {
725 unsigned int best_num, best_diff, best_den;
726 unsigned int k;
727 snd_interval_t t;
728 int err;
729
730 best_num = best_den = best_diff = 0;
731 for (k = 0; k < rats_count; ++k) {
732 unsigned int num;
733 unsigned int den = rats[k].den;
734 unsigned int q = i->min;
735 int diff;
736 num = mul(q, den);
737 if (num > rats[k].num_max)
738 continue;
739 if (num < rats[k].num_min)
740 num = rats[k].num_max;
741 else {
742 unsigned int r;
743 r = (num - rats[k].num_min) % rats[k].num_step;
744 if (r != 0)
745 num += rats[k].num_step - r;
746 }
747 diff = num - q * den;
748 if (best_num == 0 ||
749 diff * best_den < best_diff * den) {
750 best_diff = diff;
751 best_den = den;
752 best_num = num;
753 }
754 }
755 if (best_den == 0) {
756 i->empty = 1;
757 return -EINVAL;
758 }
759 t.min = div_down(best_num, best_den);
760 t.openmin = !!(best_num % best_den);
761
762 best_num = best_den = best_diff = 0;
763 for (k = 0; k < rats_count; ++k) {
764 unsigned int num;
765 unsigned int den = rats[k].den;
766 unsigned int q = i->max;
767 int diff;
768 num = mul(q, den);
769 if (num < rats[k].num_min)
770 continue;
771 if (num > rats[k].num_max)
772 num = rats[k].num_max;
773 else {
774 unsigned int r;
775 r = (num - rats[k].num_min) % rats[k].num_step;
776 if (r != 0)
777 num -= r;
778 }
779 diff = q * den - num;
780 if (best_num == 0 ||
781 diff * best_den < best_diff * den) {
782 best_diff = diff;
783 best_den = den;
784 best_num = num;
785 }
786 }
787 if (best_den == 0) {
788 i->empty = 1;
789 return -EINVAL;
790 }
791 t.max = div_up(best_num, best_den);
792 t.openmax = !!(best_num % best_den);
793 t.integer = 0;
794 err = snd_interval_refine(i, &t);
795 if (err < 0)
796 return err;
797
798 if (snd_interval_single(i)) {
799 if (nump)
800 *nump = best_num;
801 if (denp)
802 *denp = best_den;
803 }
804 return err;
805 }
806
807 /**
808 * snd_interval_list - refine the interval value from the list
809 * @i: the interval value to refine
810 * @count: the number of elements in the list
811 * @list: the value list
812 * @mask: the bit-mask to evaluate
813 *
814 * Refines the interval value from the list.
815 * When mask is non-zero, only the elements corresponding to bit 1 are
816 * evaluated.
817 *
818 * Returns non-zero if the value is changed, zero if not changed.
819 */
820 int snd_interval_list(snd_interval_t *i, unsigned int count, unsigned int *list, unsigned int mask)
821 {
822 unsigned int k;
823 int changed = 0;
824 for (k = 0; k < count; k++) {
825 if (mask && !(mask & (1 << k)))
826 continue;
827 if (i->min == list[k] && !i->openmin)
828 goto _l1;
829 if (i->min < list[k]) {
830 i->min = list[k];
831 i->openmin = 0;
832 changed = 1;
833 goto _l1;
834 }
835 }
836 i->empty = 1;
837 return -EINVAL;
838 _l1:
839 for (k = count; k-- > 0;) {
840 if (mask && !(mask & (1 << k)))
841 continue;
842 if (i->max == list[k] && !i->openmax)
843 goto _l2;
844 if (i->max > list[k]) {
845 i->max = list[k];
846 i->openmax = 0;
847 changed = 1;
848 goto _l2;
849 }
850 }
851 i->empty = 1;
852 return -EINVAL;
853 _l2:
854 if (snd_interval_checkempty(i)) {
855 i->empty = 1;
856 return -EINVAL;
857 }
858 return changed;
859 }
860
861 static int snd_interval_step(snd_interval_t *i, unsigned int min, unsigned int step)
862 {
863 unsigned int n;
864 int changed = 0;
865 n = (i->min - min) % step;
866 if (n != 0 || i->openmin) {
867 i->min += step - n;
868 changed = 1;
869 }
870 n = (i->max - min) % step;
871 if (n != 0 || i->openmax) {
872 i->max -= n;
873 changed = 1;
874 }
875 if (snd_interval_checkempty(i)) {
876 i->empty = 1;
877 return -EINVAL;
878 }
879 return changed;
880 }
881
882 /* Info constraints helpers */
883
884 /**
885 * snd_pcm_hw_rule_add - add the hw-constraint rule
886 * @runtime: the pcm runtime instance
887 * @cond: condition bits
888 * @var: the variable to evaluate
889 * @func: the evaluation function
890 * @private: the private data pointer passed to function
891 * @dep: the dependent variables
892 *
893 * Returns zero if successful, or a negative error code on failure.
894 */
895 int snd_pcm_hw_rule_add(snd_pcm_runtime_t *runtime, unsigned int cond,
896 int var,
897 snd_pcm_hw_rule_func_t func, void *private,
898 int dep, ...)
899 {
900 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
901 snd_pcm_hw_rule_t *c;
902 unsigned int k;
903 va_list args;
904 va_start(args, dep);
905 if (constrs->rules_num >= constrs->rules_all) {
906 snd_pcm_hw_rule_t *new;
907 unsigned int new_rules = constrs->rules_all + 16;
908 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
909 if (!new)
910 return -ENOMEM;
911 if (constrs->rules) {
912 memcpy(new, constrs->rules,
913 constrs->rules_num * sizeof(*c));
914 kfree(constrs->rules);
915 }
916 constrs->rules = new;
917 constrs->rules_all = new_rules;
918 }
919 c = &constrs->rules[constrs->rules_num];
920 c->cond = cond;
921 c->func = func;
922 c->var = var;
923 c->private = private;
924 k = 0;
925 while (1) {
926 snd_assert(k < ARRAY_SIZE(c->deps), return -EINVAL);
927 c->deps[k++] = dep;
928 if (dep < 0)
929 break;
930 dep = va_arg(args, int);
931 }
932 constrs->rules_num++;
933 va_end(args);
934 return 0;
935 }
936
937 /**
938 * snd_pcm_hw_constraint_mask
939 */
940 int snd_pcm_hw_constraint_mask(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
941 u_int32_t mask)
942 {
943 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
944 snd_mask_t *maskp = constrs_mask(constrs, var);
945 *maskp->bits &= mask;
946 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
947 if (*maskp->bits == 0)
948 return -EINVAL;
949 return 0;
950 }
951
952 /**
953 * snd_pcm_hw_constraint_mask64
954 */
955 int snd_pcm_hw_constraint_mask64(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
956 u_int64_t mask)
957 {
958 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
959 snd_mask_t *maskp = constrs_mask(constrs, var);
960 maskp->bits[0] &= (u_int32_t)mask;
961 maskp->bits[1] &= (u_int32_t)(mask >> 32);
962 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
963 if (! maskp->bits[0] && ! maskp->bits[1])
964 return -EINVAL;
965 return 0;
966 }
967
968 /**
969 * snd_pcm_hw_constraint_integer
970 */
971 int snd_pcm_hw_constraint_integer(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var)
972 {
973 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
974 return snd_interval_setinteger(constrs_interval(constrs, var));
975 }
976
977 /**
978 * snd_pcm_hw_constraint_minmax
979 */
980 int snd_pcm_hw_constraint_minmax(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
981 unsigned int min, unsigned int max)
982 {
983 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
984 snd_interval_t t;
985 t.min = min;
986 t.max = max;
987 t.openmin = t.openmax = 0;
988 t.integer = 0;
989 return snd_interval_refine(constrs_interval(constrs, var), &t);
990 }
991
992 static int snd_pcm_hw_rule_list(snd_pcm_hw_params_t *params,
993 snd_pcm_hw_rule_t *rule)
994 {
995 snd_pcm_hw_constraint_list_t *list = rule->private;
996 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
997 }
998
999
1000 /**
1001 * snd_pcm_hw_constraint_list
1002 */
1003 int snd_pcm_hw_constraint_list(snd_pcm_runtime_t *runtime,
1004 unsigned int cond,
1005 snd_pcm_hw_param_t var,
1006 snd_pcm_hw_constraint_list_t *l)
1007 {
1008 return snd_pcm_hw_rule_add(runtime, cond, var,
1009 snd_pcm_hw_rule_list, l,
1010 var, -1);
1011 }
1012
1013 static int snd_pcm_hw_rule_ratnums(snd_pcm_hw_params_t *params,
1014 snd_pcm_hw_rule_t *rule)
1015 {
1016 snd_pcm_hw_constraint_ratnums_t *r = rule->private;
1017 unsigned int num = 0, den = 0;
1018 int err;
1019 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1020 r->nrats, r->rats, &num, &den);
1021 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1022 params->rate_num = num;
1023 params->rate_den = den;
1024 }
1025 return err;
1026 }
1027
1028 /**
1029 * snd_pcm_hw_constraint_ratnums
1030 */
1031 int snd_pcm_hw_constraint_ratnums(snd_pcm_runtime_t *runtime,
1032 unsigned int cond,
1033 snd_pcm_hw_param_t var,
1034 snd_pcm_hw_constraint_ratnums_t *r)
1035 {
1036 return snd_pcm_hw_rule_add(runtime, cond, var,
1037 snd_pcm_hw_rule_ratnums, r,
1038 var, -1);
1039 }
1040
1041 static int snd_pcm_hw_rule_ratdens(snd_pcm_hw_params_t *params,
1042 snd_pcm_hw_rule_t *rule)
1043 {
1044 snd_pcm_hw_constraint_ratdens_t *r = rule->private;
1045 unsigned int num = 0, den = 0;
1046 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1047 r->nrats, r->rats, &num, &den);
1048 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1049 params->rate_num = num;
1050 params->rate_den = den;
1051 }
1052 return err;
1053 }
1054
1055 /**
1056 * snd_pcm_hw_constraint_ratdens
1057 */
1058 int snd_pcm_hw_constraint_ratdens(snd_pcm_runtime_t *runtime,
1059 unsigned int cond,
1060 snd_pcm_hw_param_t var,
1061 snd_pcm_hw_constraint_ratdens_t *r)
1062 {
1063 return snd_pcm_hw_rule_add(runtime, cond, var,
1064 snd_pcm_hw_rule_ratdens, r,
1065 var, -1);
1066 }
1067
1068 static int snd_pcm_hw_rule_msbits(snd_pcm_hw_params_t *params,
1069 snd_pcm_hw_rule_t *rule)
1070 {
1071 unsigned int l = (unsigned long) rule->private;
1072 int width = l & 0xffff;
1073 unsigned int msbits = l >> 16;
1074 snd_interval_t *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1075 if (snd_interval_single(i) && snd_interval_value(i) == width)
1076 params->msbits = msbits;
1077 return 0;
1078 }
1079
1080 /**
1081 * snd_pcm_hw_constraint_msbits
1082 */
1083 int snd_pcm_hw_constraint_msbits(snd_pcm_runtime_t *runtime,
1084 unsigned int cond,
1085 unsigned int width,
1086 unsigned int msbits)
1087 {
1088 unsigned long l = (msbits << 16) | width;
1089 return snd_pcm_hw_rule_add(runtime, cond, -1,
1090 snd_pcm_hw_rule_msbits,
1091 (void*) l,
1092 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1093 }
1094
1095 static int snd_pcm_hw_rule_step(snd_pcm_hw_params_t *params,
1096 snd_pcm_hw_rule_t *rule)
1097 {
1098 unsigned long step = (unsigned long) rule->private;
1099 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1100 }
1101
1102 /**
1103 * snd_pcm_hw_constraint_step
1104 */
1105 int snd_pcm_hw_constraint_step(snd_pcm_runtime_t *runtime,
1106 unsigned int cond,
1107 snd_pcm_hw_param_t var,
1108 unsigned long step)
1109 {
1110 return snd_pcm_hw_rule_add(runtime, cond, var,
1111 snd_pcm_hw_rule_step, (void *) step,
1112 var, -1);
1113 }
1114
1115 static int snd_pcm_hw_rule_pow2(snd_pcm_hw_params_t *params, snd_pcm_hw_rule_t *rule)
1116 {
1117 static int pow2_sizes[] = {
1118 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1119 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1120 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1121 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1122 };
1123 return snd_interval_list(hw_param_interval(params, rule->var),
1124 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1125 }
1126
1127 /**
1128 * snd_pcm_hw_constraint_pow2
1129 */
1130 int snd_pcm_hw_constraint_pow2(snd_pcm_runtime_t *runtime,
1131 unsigned int cond,
1132 snd_pcm_hw_param_t var)
1133 {
1134 return snd_pcm_hw_rule_add(runtime, cond, var,
1135 snd_pcm_hw_rule_pow2, NULL,
1136 var, -1);
1137 }
1138
1139 /* To use the same code we have in alsa-lib */
1140 #define snd_pcm_t snd_pcm_substream_t
1141 #define assert(i) snd_assert((i), return -EINVAL)
1142 #ifndef INT_MIN
1143 #define INT_MIN ((int)((unsigned int)INT_MAX+1))
1144 #endif
1145
1146 static void _snd_pcm_hw_param_any(snd_pcm_hw_params_t *params,
1147 snd_pcm_hw_param_t var)
1148 {
1149 if (hw_is_mask(var)) {
1150 snd_mask_any(hw_param_mask(params, var));
1151 params->cmask |= 1 << var;
1152 params->rmask |= 1 << var;
1153 return;
1154 }
1155 if (hw_is_interval(var)) {
1156 snd_interval_any(hw_param_interval(params, var));
1157 params->cmask |= 1 << var;
1158 params->rmask |= 1 << var;
1159 return;
1160 }
1161 snd_BUG();
1162 }
1163
1164 #if 0
1165 /**
1166 * snd_pcm_hw_param_any
1167 */
1168 int snd_pcm_hw_param_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1169 snd_pcm_hw_param_t var)
1170 {
1171 _snd_pcm_hw_param_any(params, var);
1172 return snd_pcm_hw_refine(pcm, params);
1173 }
1174 #endif /* 0 */
1175
1176 void _snd_pcm_hw_params_any(snd_pcm_hw_params_t *params)
1177 {
1178 unsigned int k;
1179 memset(params, 0, sizeof(*params));
1180 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1181 _snd_pcm_hw_param_any(params, k);
1182 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1183 _snd_pcm_hw_param_any(params, k);
1184 params->info = ~0U;
1185 }
1186
1187 #if 0
1188 /**
1189 * snd_pcm_hw_params_any
1190 *
1191 * Fill PARAMS with full configuration space boundaries
1192 */
1193 int snd_pcm_hw_params_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
1194 {
1195 _snd_pcm_hw_params_any(params);
1196 return snd_pcm_hw_refine(pcm, params);
1197 }
1198 #endif /* 0 */
1199
1200 /**
1201 * snd_pcm_hw_param_value
1202 *
1203 * Return the value for field PAR if it's fixed in configuration space
1204 * defined by PARAMS. Return -EINVAL otherwise
1205 */
1206 static int snd_pcm_hw_param_value(const snd_pcm_hw_params_t *params,
1207 snd_pcm_hw_param_t var, int *dir)
1208 {
1209 if (hw_is_mask(var)) {
1210 const snd_mask_t *mask = hw_param_mask_c(params, var);
1211 if (!snd_mask_single(mask))
1212 return -EINVAL;
1213 if (dir)
1214 *dir = 0;
1215 return snd_mask_value(mask);
1216 }
1217 if (hw_is_interval(var)) {
1218 const snd_interval_t *i = hw_param_interval_c(params, var);
1219 if (!snd_interval_single(i))
1220 return -EINVAL;
1221 if (dir)
1222 *dir = i->openmin;
1223 return snd_interval_value(i);
1224 }
1225 assert(0);
1226 return -EINVAL;
1227 }
1228
1229 /**
1230 * snd_pcm_hw_param_value_min
1231 *
1232 * Return the minimum value for field PAR.
1233 */
1234 unsigned int snd_pcm_hw_param_value_min(const snd_pcm_hw_params_t *params,
1235 snd_pcm_hw_param_t var, int *dir)
1236 {
1237 if (hw_is_mask(var)) {
1238 if (dir)
1239 *dir = 0;
1240 return snd_mask_min(hw_param_mask_c(params, var));
1241 }
1242 if (hw_is_interval(var)) {
1243 const snd_interval_t *i = hw_param_interval_c(params, var);
1244 if (dir)
1245 *dir = i->openmin;
1246 return snd_interval_min(i);
1247 }
1248 assert(0);
1249 return -EINVAL;
1250 }
1251
1252 /**
1253 * snd_pcm_hw_param_value_max
1254 *
1255 * Return the maximum value for field PAR.
1256 */
1257 unsigned int snd_pcm_hw_param_value_max(const snd_pcm_hw_params_t *params,
1258 snd_pcm_hw_param_t var, int *dir)
1259 {
1260 if (hw_is_mask(var)) {
1261 if (dir)
1262 *dir = 0;
1263 return snd_mask_max(hw_param_mask_c(params, var));
1264 }
1265 if (hw_is_interval(var)) {
1266 const snd_interval_t *i = hw_param_interval_c(params, var);
1267 if (dir)
1268 *dir = - (int) i->openmax;
1269 return snd_interval_max(i);
1270 }
1271 assert(0);
1272 return -EINVAL;
1273 }
1274
1275 void _snd_pcm_hw_param_setempty(snd_pcm_hw_params_t *params,
1276 snd_pcm_hw_param_t var)
1277 {
1278 if (hw_is_mask(var)) {
1279 snd_mask_none(hw_param_mask(params, var));
1280 params->cmask |= 1 << var;
1281 params->rmask |= 1 << var;
1282 } else if (hw_is_interval(var)) {
1283 snd_interval_none(hw_param_interval(params, var));
1284 params->cmask |= 1 << var;
1285 params->rmask |= 1 << var;
1286 } else {
1287 snd_BUG();
1288 }
1289 }
1290
1291 int _snd_pcm_hw_param_setinteger(snd_pcm_hw_params_t *params,
1292 snd_pcm_hw_param_t var)
1293 {
1294 int changed;
1295 assert(hw_is_interval(var));
1296 changed = snd_interval_setinteger(hw_param_interval(params, var));
1297 if (changed) {
1298 params->cmask |= 1 << var;
1299 params->rmask |= 1 << var;
1300 }
1301 return changed;
1302 }
1303
1304 #if 0
1305 /**
1306 * snd_pcm_hw_param_setinteger
1307 *
1308 * Inside configuration space defined by PARAMS remove from PAR all
1309 * non integer values. Reduce configuration space accordingly.
1310 * Return -EINVAL if the configuration space is empty
1311 */
1312 int snd_pcm_hw_param_setinteger(snd_pcm_t *pcm,
1313 snd_pcm_hw_params_t *params,
1314 snd_pcm_hw_param_t var)
1315 {
1316 int changed = _snd_pcm_hw_param_setinteger(params, var);
1317 if (changed < 0)
1318 return changed;
1319 if (params->rmask) {
1320 int err = snd_pcm_hw_refine(pcm, params);
1321 if (err < 0)
1322 return err;
1323 }
1324 return 0;
1325 }
1326 #endif /* 0 */
1327
1328 static int _snd_pcm_hw_param_first(snd_pcm_hw_params_t *params,
1329 snd_pcm_hw_param_t var)
1330 {
1331 int changed;
1332 if (hw_is_mask(var))
1333 changed = snd_mask_refine_first(hw_param_mask(params, var));
1334 else if (hw_is_interval(var))
1335 changed = snd_interval_refine_first(hw_param_interval(params, var));
1336 else {
1337 assert(0);
1338 return -EINVAL;
1339 }
1340 if (changed) {
1341 params->cmask |= 1 << var;
1342 params->rmask |= 1 << var;
1343 }
1344 return changed;
1345 }
1346
1347
1348 /**
1349 * snd_pcm_hw_param_first
1350 *
1351 * Inside configuration space defined by PARAMS remove from PAR all
1352 * values > minimum. Reduce configuration space accordingly.
1353 * Return the minimum.
1354 */
1355 static int snd_pcm_hw_param_first(snd_pcm_t *pcm,
1356 snd_pcm_hw_params_t *params,
1357 snd_pcm_hw_param_t var, int *dir)
1358 {
1359 int changed = _snd_pcm_hw_param_first(params, var);
1360 if (changed < 0)
1361 return changed;
1362 if (params->rmask) {
1363 int err = snd_pcm_hw_refine(pcm, params);
1364 assert(err >= 0);
1365 }
1366 return snd_pcm_hw_param_value(params, var, dir);
1367 }
1368
1369 static int _snd_pcm_hw_param_last(snd_pcm_hw_params_t *params,
1370 snd_pcm_hw_param_t var)
1371 {
1372 int changed;
1373 if (hw_is_mask(var))
1374 changed = snd_mask_refine_last(hw_param_mask(params, var));
1375 else if (hw_is_interval(var))
1376 changed = snd_interval_refine_last(hw_param_interval(params, var));
1377 else {
1378 assert(0);
1379 return -EINVAL;
1380 }
1381 if (changed) {
1382 params->cmask |= 1 << var;
1383 params->rmask |= 1 << var;
1384 }
1385 return changed;
1386 }
1387
1388
1389 /**
1390 * snd_pcm_hw_param_last
1391 *
1392 * Inside configuration space defined by PARAMS remove from PAR all
1393 * values < maximum. Reduce configuration space accordingly.
1394 * Return the maximum.
1395 */
1396 static int snd_pcm_hw_param_last(snd_pcm_t *pcm,
1397 snd_pcm_hw_params_t *params,
1398 snd_pcm_hw_param_t var, int *dir)
1399 {
1400 int changed = _snd_pcm_hw_param_last(params, var);
1401 if (changed < 0)
1402 return changed;
1403 if (params->rmask) {
1404 int err = snd_pcm_hw_refine(pcm, params);
1405 assert(err >= 0);
1406 }
1407 return snd_pcm_hw_param_value(params, var, dir);
1408 }
1409
1410 int _snd_pcm_hw_param_min(snd_pcm_hw_params_t *params,
1411 snd_pcm_hw_param_t var, unsigned int val, int dir)
1412 {
1413 int changed;
1414 int open = 0;
1415 if (dir) {
1416 if (dir > 0) {
1417 open = 1;
1418 } else if (dir < 0) {
1419 if (val > 0) {
1420 open = 1;
1421 val--;
1422 }
1423 }
1424 }
1425 if (hw_is_mask(var))
1426 changed = snd_mask_refine_min(hw_param_mask(params, var), val + !!open);
1427 else if (hw_is_interval(var))
1428 changed = snd_interval_refine_min(hw_param_interval(params, var), val, open);
1429 else {
1430 assert(0);
1431 return -EINVAL;
1432 }
1433 if (changed) {
1434 params->cmask |= 1 << var;
1435 params->rmask |= 1 << var;
1436 }
1437 return changed;
1438 }
1439
1440 /**
1441 * snd_pcm_hw_param_min
1442 *
1443 * Inside configuration space defined by PARAMS remove from PAR all
1444 * values < VAL. Reduce configuration space accordingly.
1445 * Return new minimum or -EINVAL if the configuration space is empty
1446 */
1447 static int snd_pcm_hw_param_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1448 snd_pcm_hw_param_t var, unsigned int val,
1449 int *dir)
1450 {
1451 int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
1452 if (changed < 0)
1453 return changed;
1454 if (params->rmask) {
1455 int err = snd_pcm_hw_refine(pcm, params);
1456 if (err < 0)
1457 return err;
1458 }
1459 return snd_pcm_hw_param_value_min(params, var, dir);
1460 }
1461
1462 static int _snd_pcm_hw_param_max(snd_pcm_hw_params_t *params,
1463 snd_pcm_hw_param_t var, unsigned int val,
1464 int dir)
1465 {
1466 int changed;
1467 int open = 0;
1468 if (dir) {
1469 if (dir < 0) {
1470 open = 1;
1471 } else if (dir > 0) {
1472 open = 1;
1473 val++;
1474 }
1475 }
1476 if (hw_is_mask(var)) {
1477 if (val == 0 && open) {
1478 snd_mask_none(hw_param_mask(params, var));
1479 changed = -EINVAL;
1480 } else
1481 changed = snd_mask_refine_max(hw_param_mask(params, var), val - !!open);
1482 } else if (hw_is_interval(var))
1483 changed = snd_interval_refine_max(hw_param_interval(params, var), val, open);
1484 else {
1485 assert(0);
1486 return -EINVAL;
1487 }
1488 if (changed) {
1489 params->cmask |= 1 << var;
1490 params->rmask |= 1 << var;
1491 }
1492 return changed;
1493 }
1494
1495 /**
1496 * snd_pcm_hw_param_max
1497 *
1498 * Inside configuration space defined by PARAMS remove from PAR all
1499 * values >= VAL + 1. Reduce configuration space accordingly.
1500 * Return new maximum or -EINVAL if the configuration space is empty
1501 */
1502 static int snd_pcm_hw_param_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1503 snd_pcm_hw_param_t var, unsigned int val,
1504 int *dir)
1505 {
1506 int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
1507 if (changed < 0)
1508 return changed;
1509 if (params->rmask) {
1510 int err = snd_pcm_hw_refine(pcm, params);
1511 if (err < 0)
1512 return err;
1513 }
1514 return snd_pcm_hw_param_value_max(params, var, dir);
1515 }
1516
1517 int _snd_pcm_hw_param_set(snd_pcm_hw_params_t *params,
1518 snd_pcm_hw_param_t var, unsigned int val, int dir)
1519 {
1520 int changed;
1521 if (hw_is_mask(var)) {
1522 snd_mask_t *m = hw_param_mask(params, var);
1523 if (val == 0 && dir < 0) {
1524 changed = -EINVAL;
1525 snd_mask_none(m);
1526 } else {
1527 if (dir > 0)
1528 val++;
1529 else if (dir < 0)
1530 val--;
1531 changed = snd_mask_refine_set(hw_param_mask(params, var), val);
1532 }
1533 } else if (hw_is_interval(var)) {
1534 snd_interval_t *i = hw_param_interval(params, var);
1535 if (val == 0 && dir < 0) {
1536 changed = -EINVAL;
1537 snd_interval_none(i);
1538 } else if (dir == 0)
1539 changed = snd_interval_refine_set(i, val);
1540 else {
1541 snd_interval_t t;
1542 t.openmin = 1;
1543 t.openmax = 1;
1544 t.empty = 0;
1545 t.integer = 0;
1546 if (dir < 0) {
1547 t.min = val - 1;
1548 t.max = val;
1549 } else {
1550 t.min = val;
1551 t.max = val+1;
1552 }
1553 changed = snd_interval_refine(i, &t);
1554 }
1555 } else {
1556 assert(0);
1557 return -EINVAL;
1558 }
1559 if (changed) {
1560 params->cmask |= 1 << var;
1561 params->rmask |= 1 << var;
1562 }
1563 return changed;
1564 }
1565
1566 /**
1567 * snd_pcm_hw_param_set
1568 *
1569 * Inside configuration space defined by PARAMS remove from PAR all
1570 * values != VAL. Reduce configuration space accordingly.
1571 * Return VAL or -EINVAL if the configuration space is empty
1572 */
1573 int snd_pcm_hw_param_set(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1574 snd_pcm_hw_param_t var, unsigned int val, int dir)
1575 {
1576 int changed = _snd_pcm_hw_param_set(params, var, val, dir);
1577 if (changed < 0)
1578 return changed;
1579 if (params->rmask) {
1580 int err = snd_pcm_hw_refine(pcm, params);
1581 if (err < 0)
1582 return err;
1583 }
1584 return snd_pcm_hw_param_value(params, var, NULL);
1585 }
1586
1587 int _snd_pcm_hw_param_mask(snd_pcm_hw_params_t *params,
1588 snd_pcm_hw_param_t var, const snd_mask_t *val)
1589 {
1590 int changed;
1591 assert(hw_is_mask(var));
1592 changed = snd_mask_refine(hw_param_mask(params, var), val);
1593 if (changed) {
1594 params->cmask |= 1 << var;
1595 params->rmask |= 1 << var;
1596 }
1597 return changed;
1598 }
1599
1600 /**
1601 * snd_pcm_hw_param_mask
1602 *
1603 * Inside configuration space defined by PARAMS remove from PAR all values
1604 * not contained in MASK. Reduce configuration space accordingly.
1605 * This function can be called only for SNDRV_PCM_HW_PARAM_ACCESS,
1606 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1607 * Return 0 on success or -EINVAL
1608 * if the configuration space is empty
1609 */
1610 int snd_pcm_hw_param_mask(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1611 snd_pcm_hw_param_t var, const snd_mask_t *val)
1612 {
1613 int changed = _snd_pcm_hw_param_mask(params, var, val);
1614 if (changed < 0)
1615 return changed;
1616 if (params->rmask) {
1617 int err = snd_pcm_hw_refine(pcm, params);
1618 if (err < 0)
1619 return err;
1620 }
1621 return 0;
1622 }
1623
1624 static int boundary_sub(int a, int adir,
1625 int b, int bdir,
1626 int *c, int *cdir)
1627 {
1628 adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
1629 bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
1630 *c = a - b;
1631 *cdir = adir - bdir;
1632 if (*cdir == -2) {
1633 assert(*c > INT_MIN);
1634 (*c)--;
1635 } else if (*cdir == 2) {
1636 assert(*c < INT_MAX);
1637 (*c)++;
1638 }
1639 return 0;
1640 }
1641
1642 static int boundary_lt(unsigned int a, int adir,
1643 unsigned int b, int bdir)
1644 {
1645 assert(a > 0 || adir >= 0);
1646 assert(b > 0 || bdir >= 0);
1647 if (adir < 0) {
1648 a--;
1649 adir = 1;
1650 } else if (adir > 0)
1651 adir = 1;
1652 if (bdir < 0) {
1653 b--;
1654 bdir = 1;
1655 } else if (bdir > 0)
1656 bdir = 1;
1657 return a < b || (a == b && adir < bdir);
1658 }
1659
1660 /* Return 1 if min is nearer to best than max */
1661 static int boundary_nearer(int min, int mindir,
1662 int best, int bestdir,
1663 int max, int maxdir)
1664 {
1665 int dmin, dmindir;
1666 int dmax, dmaxdir;
1667 boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
1668 boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
1669 return boundary_lt(dmin, dmindir, dmax, dmaxdir);
1670 }
1671
1672 /**
1673 * snd_pcm_hw_param_near
1674 *
1675 * Inside configuration space defined by PARAMS set PAR to the available value
1676 * nearest to VAL. Reduce configuration space accordingly.
1677 * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
1678 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1679 * Return the value found.
1680 */
1681 int snd_pcm_hw_param_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1682 snd_pcm_hw_param_t var, unsigned int best, int *dir)
1683 {
1684 snd_pcm_hw_params_t *save = NULL;
1685 int v;
1686 unsigned int saved_min;
1687 int last = 0;
1688 int min, max;
1689 int mindir, maxdir;
1690 int valdir = dir ? *dir : 0;
1691 /* FIXME */
1692 if (best > INT_MAX)
1693 best = INT_MAX;
1694 min = max = best;
1695 mindir = maxdir = valdir;
1696 if (maxdir > 0)
1697 maxdir = 0;
1698 else if (maxdir == 0)
1699 maxdir = -1;
1700 else {
1701 maxdir = 1;
1702 max--;
1703 }
1704 save = kmalloc(sizeof(*save), GFP_KERNEL);
1705 if (save == NULL)
1706 return -ENOMEM;
1707 *save = *params;
1708 saved_min = min;
1709 min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
1710 if (min >= 0) {
1711 snd_pcm_hw_params_t *params1;
1712 if (max < 0)
1713 goto _end;
1714 if ((unsigned int)min == saved_min && mindir == valdir)
1715 goto _end;
1716 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
1717 if (params1 == NULL) {
1718 kfree(save);
1719 return -ENOMEM;
1720 }
1721 *params1 = *save;
1722 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
1723 if (max < 0) {
1724 kfree(params1);
1725 goto _end;
1726 }
1727 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
1728 *params = *params1;
1729 last = 1;
1730 }
1731 kfree(params1);
1732 } else {
1733 *params = *save;
1734 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
1735 assert(max >= 0);
1736 last = 1;
1737 }
1738 _end:
1739 kfree(save);
1740 if (last)
1741 v = snd_pcm_hw_param_last(pcm, params, var, dir);
1742 else
1743 v = snd_pcm_hw_param_first(pcm, params, var, dir);
1744 assert(v >= 0);
1745 return v;
1746 }
1747
1748 /**
1749 * snd_pcm_hw_param_choose
1750 *
1751 * Choose one configuration from configuration space defined by PARAMS
1752 * The configuration chosen is that obtained fixing in this order:
1753 * first access, first format, first subformat, min channels,
1754 * min rate, min period time, max buffer size, min tick time
1755 */
1756 int snd_pcm_hw_params_choose(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
1757 {
1758 int err;
1759
1760 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_ACCESS, NULL);
1761 assert(err >= 0);
1762
1763 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_FORMAT, NULL);
1764 assert(err >= 0);
1765
1766 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_SUBFORMAT, NULL);
1767 assert(err >= 0);
1768
1769 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_CHANNELS, NULL);
1770 assert(err >= 0);
1771
1772 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_RATE, NULL);
1773 assert(err >= 0);
1774
1775 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_PERIOD_TIME, NULL);
1776 assert(err >= 0);
1777
1778 err = snd_pcm_hw_param_last(pcm, params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL);
1779 assert(err >= 0);
1780
1781 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_TICK_TIME, NULL);
1782 assert(err >= 0);
1783
1784 return 0;
1785 }
1786
1787 #undef snd_pcm_t
1788 #undef assert
1789
1790 static int snd_pcm_lib_ioctl_reset(snd_pcm_substream_t *substream,
1791 void *arg)
1792 {
1793 snd_pcm_runtime_t *runtime = substream->runtime;
1794 unsigned long flags;
1795 snd_pcm_stream_lock_irqsave(substream, flags);
1796 if (snd_pcm_running(substream) &&
1797 snd_pcm_update_hw_ptr(substream) >= 0)
1798 runtime->status->hw_ptr %= runtime->buffer_size;
1799 else
1800 runtime->status->hw_ptr = 0;
1801 snd_pcm_stream_unlock_irqrestore(substream, flags);
1802 return 0;
1803 }
1804
1805 static int snd_pcm_lib_ioctl_channel_info(snd_pcm_substream_t *substream,
1806 void *arg)
1807 {
1808 snd_pcm_channel_info_t *info = arg;
1809 snd_pcm_runtime_t *runtime = substream->runtime;
1810 int width;
1811 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1812 info->offset = -1;
1813 return 0;
1814 }
1815 width = snd_pcm_format_physical_width(runtime->format);
1816 if (width < 0)
1817 return width;
1818 info->offset = 0;
1819 switch (runtime->access) {
1820 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1821 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1822 info->first = info->channel * width;
1823 info->step = runtime->channels * width;
1824 break;
1825 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1826 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1827 {
1828 size_t size = runtime->dma_bytes / runtime->channels;
1829 info->first = info->channel * size * 8;
1830 info->step = width;
1831 break;
1832 }
1833 default:
1834 snd_BUG();
1835 break;
1836 }
1837 return 0;
1838 }
1839
1840 /**
1841 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1842 * @substream: the pcm substream instance
1843 * @cmd: ioctl command
1844 * @arg: ioctl argument
1845 *
1846 * Processes the generic ioctl commands for PCM.
1847 * Can be passed as the ioctl callback for PCM ops.
1848 *
1849 * Returns zero if successful, or a negative error code on failure.
1850 */
1851 int snd_pcm_lib_ioctl(snd_pcm_substream_t *substream,
1852 unsigned int cmd, void *arg)
1853 {
1854 switch (cmd) {
1855 case SNDRV_PCM_IOCTL1_INFO:
1856 return 0;
1857 case SNDRV_PCM_IOCTL1_RESET:
1858 return snd_pcm_lib_ioctl_reset(substream, arg);
1859 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1860 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1861 }
1862 return -ENXIO;
1863 }
1864
1865 /*
1866 * Conditions
1867 */
1868
1869 static void snd_pcm_system_tick_set(snd_pcm_substream_t *substream,
1870 unsigned long ticks)
1871 {
1872 snd_pcm_runtime_t *runtime = substream->runtime;
1873 if (ticks == 0)
1874 del_timer(&runtime->tick_timer);
1875 else {
1876 ticks += (1000000 / HZ) - 1;
1877 ticks /= (1000000 / HZ);
1878 mod_timer(&runtime->tick_timer, jiffies + ticks);
1879 }
1880 }
1881
1882 /* Temporary alias */
1883 void snd_pcm_tick_set(snd_pcm_substream_t *substream, unsigned long ticks)
1884 {
1885 snd_pcm_system_tick_set(substream, ticks);
1886 }
1887
1888 void snd_pcm_tick_prepare(snd_pcm_substream_t *substream)
1889 {
1890 snd_pcm_runtime_t *runtime = substream->runtime;
1891 snd_pcm_uframes_t frames = ULONG_MAX;
1892 snd_pcm_uframes_t avail, dist;
1893 unsigned int ticks;
1894 u_int64_t n;
1895 u_int32_t r;
1896 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1897 if (runtime->silence_size >= runtime->boundary) {
1898 frames = 1;
1899 } else if (runtime->silence_size > 0 &&
1900 runtime->silence_filled < runtime->buffer_size) {
1901 snd_pcm_sframes_t noise_dist;
1902 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
1903 snd_assert(noise_dist <= (snd_pcm_sframes_t)runtime->silence_threshold, );
1904 frames = noise_dist - runtime->silence_threshold;
1905 }
1906 avail = snd_pcm_playback_avail(runtime);
1907 } else {
1908 avail = snd_pcm_capture_avail(runtime);
1909 }
1910 if (avail < runtime->control->avail_min) {
1911 snd_pcm_sframes_t n = runtime->control->avail_min - avail;
1912 if (n > 0 && frames > (snd_pcm_uframes_t)n)
1913 frames = n;
1914 }
1915 if (avail < runtime->buffer_size) {
1916 snd_pcm_sframes_t n = runtime->buffer_size - avail;
1917 if (n > 0 && frames > (snd_pcm_uframes_t)n)
1918 frames = n;
1919 }
1920 if (frames == ULONG_MAX) {
1921 snd_pcm_tick_set(substream, 0);
1922 return;
1923 }
1924 dist = runtime->status->hw_ptr - runtime->hw_ptr_base;
1925 /* Distance to next interrupt */
1926 dist = runtime->period_size - dist % runtime->period_size;
1927 if (dist <= frames) {
1928 snd_pcm_tick_set(substream, 0);
1929 return;
1930 }
1931 /* the base time is us */
1932 n = frames;
1933 n *= 1000000;
1934 div64_32(&n, runtime->tick_time * runtime->rate, &r);
1935 ticks = n + (r > 0 ? 1 : 0);
1936 if (ticks < runtime->sleep_min)
1937 ticks = runtime->sleep_min;
1938 snd_pcm_tick_set(substream, (unsigned long) ticks);
1939 }
1940
1941 void snd_pcm_tick_elapsed(snd_pcm_substream_t *substream)
1942 {
1943 snd_pcm_runtime_t *runtime;
1944 unsigned long flags;
1945
1946 snd_assert(substream != NULL, return);
1947 runtime = substream->runtime;
1948 snd_assert(runtime != NULL, return);
1949
1950 snd_pcm_stream_lock_irqsave(substream, flags);
1951 if (!snd_pcm_running(substream) ||
1952 snd_pcm_update_hw_ptr(substream) < 0)
1953 goto _end;
1954 if (runtime->sleep_min)
1955 snd_pcm_tick_prepare(substream);
1956 _end:
1957 snd_pcm_stream_unlock_irqrestore(substream, flags);
1958 }
1959
1960 /**
1961 * snd_pcm_period_elapsed - update the pcm status for the next period
1962 * @substream: the pcm substream instance
1963 *
1964 * This function is called from the interrupt handler when the
1965 * PCM has processed the period size. It will update the current
1966 * pointer, set up the tick, wake up sleepers, etc.
1967 *
1968 * Even if more than one periods have elapsed since the last call, you
1969 * have to call this only once.
1970 */
1971 void snd_pcm_period_elapsed(snd_pcm_substream_t *substream)
1972 {
1973 snd_pcm_runtime_t *runtime;
1974 unsigned long flags;
1975
1976 snd_assert(substream != NULL, return);
1977 runtime = substream->runtime;
1978 snd_assert(runtime != NULL, return);
1979
1980 if (runtime->transfer_ack_begin)
1981 runtime->transfer_ack_begin(substream);
1982
1983 snd_pcm_stream_lock_irqsave(substream, flags);
1984 if (!snd_pcm_running(substream) ||
1985 snd_pcm_update_hw_ptr_interrupt(substream) < 0)
1986 goto _end;
1987
1988 if (substream->timer_running)
1989 snd_timer_interrupt(substream->timer, 1);
1990 if (runtime->sleep_min)
1991 snd_pcm_tick_prepare(substream);
1992 _end:
1993 snd_pcm_stream_unlock_irqrestore(substream, flags);
1994 if (runtime->transfer_ack_end)
1995 runtime->transfer_ack_end(substream);
1996 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1997 }
1998
1999 static int snd_pcm_lib_write_transfer(snd_pcm_substream_t *substream,
2000 unsigned int hwoff,
2001 unsigned long data, unsigned int off,
2002 snd_pcm_uframes_t frames)
2003 {
2004 snd_pcm_runtime_t *runtime = substream->runtime;
2005 int err;
2006 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2007 if (substream->ops->copy) {
2008 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2009 return err;
2010 } else {
2011 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2012 snd_assert(runtime->dma_area, return -EFAULT);
2013 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
2014 return -EFAULT;
2015 }
2016 return 0;
2017 }
2018
2019 typedef int (*transfer_f)(snd_pcm_substream_t *substream, unsigned int hwoff,
2020 unsigned long data, unsigned int off,
2021 snd_pcm_uframes_t size);
2022
2023 static snd_pcm_sframes_t snd_pcm_lib_write1(snd_pcm_substream_t *substream,
2024 unsigned long data,
2025 snd_pcm_uframes_t size,
2026 int nonblock,
2027 transfer_f transfer)
2028 {
2029 snd_pcm_runtime_t *runtime = substream->runtime;
2030 snd_pcm_uframes_t xfer = 0;
2031 snd_pcm_uframes_t offset = 0;
2032 int err = 0;
2033
2034 if (size == 0)
2035 return 0;
2036 if (size > runtime->xfer_align)
2037 size -= size % runtime->xfer_align;
2038
2039 snd_pcm_stream_lock_irq(substream);
2040 switch (runtime->status->state) {
2041 case SNDRV_PCM_STATE_PREPARED:
2042 case SNDRV_PCM_STATE_RUNNING:
2043 case SNDRV_PCM_STATE_PAUSED:
2044 break;
2045 case SNDRV_PCM_STATE_XRUN:
2046 err = -EPIPE;
2047 goto _end_unlock;
2048 case SNDRV_PCM_STATE_SUSPENDED:
2049 err = -ESTRPIPE;
2050 goto _end_unlock;
2051 default:
2052 err = -EBADFD;
2053 goto _end_unlock;
2054 }
2055
2056 while (size > 0) {
2057 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2058 snd_pcm_uframes_t avail;
2059 snd_pcm_uframes_t cont;
2060 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2061 snd_pcm_update_hw_ptr(substream);
2062 avail = snd_pcm_playback_avail(runtime);
2063 if (((avail < runtime->control->avail_min && size > avail) ||
2064 (size >= runtime->xfer_align && avail < runtime->xfer_align))) {
2065 wait_queue_t wait;
2066 enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED } state;
2067 long tout;
2068
2069 if (nonblock) {
2070 err = -EAGAIN;
2071 goto _end_unlock;
2072 }
2073
2074 init_waitqueue_entry(&wait, current);
2075 add_wait_queue(&runtime->sleep, &wait);
2076 while (1) {
2077 if (signal_pending(current)) {
2078 state = SIGNALED;
2079 break;
2080 }
2081 set_current_state(TASK_INTERRUPTIBLE);
2082 snd_pcm_stream_unlock_irq(substream);
2083 tout = schedule_timeout(10 * HZ);
2084 snd_pcm_stream_lock_irq(substream);
2085 if (tout == 0) {
2086 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2087 runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2088 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2089 break;
2090 }
2091 }
2092 switch (runtime->status->state) {
2093 case SNDRV_PCM_STATE_XRUN:
2094 case SNDRV_PCM_STATE_DRAINING:
2095 state = ERROR;
2096 goto _end_loop;
2097 case SNDRV_PCM_STATE_SUSPENDED:
2098 state = SUSPENDED;
2099 goto _end_loop;
2100 default:
2101 break;
2102 }
2103 avail = snd_pcm_playback_avail(runtime);
2104 if (avail >= runtime->control->avail_min) {
2105 state = READY;
2106 break;
2107 }
2108 }
2109 _end_loop:
2110 remove_wait_queue(&runtime->sleep, &wait);
2111
2112 switch (state) {
2113 case ERROR:
2114 err = -EPIPE;
2115 goto _end_unlock;
2116 case SUSPENDED:
2117 err = -ESTRPIPE;
2118 goto _end_unlock;
2119 case SIGNALED:
2120 err = -ERESTARTSYS;
2121 goto _end_unlock;
2122 case EXPIRED:
2123 snd_printd("playback write error (DMA or IRQ trouble?)\n");
2124 err = -EIO;
2125 goto _end_unlock;
2126 default:
2127 break;
2128 }
2129 }
2130 if (avail > runtime->xfer_align)
2131 avail -= avail % runtime->xfer_align;
2132 frames = size > avail ? avail : size;
2133 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2134 if (frames > cont)
2135 frames = cont;
2136 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2137 appl_ptr = runtime->control->appl_ptr;
2138 appl_ofs = appl_ptr % runtime->buffer_size;
2139 snd_pcm_stream_unlock_irq(substream);
2140 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2141 goto _end;
2142 snd_pcm_stream_lock_irq(substream);
2143 switch (runtime->status->state) {
2144 case SNDRV_PCM_STATE_XRUN:
2145 err = -EPIPE;
2146 goto _end_unlock;
2147 case SNDRV_PCM_STATE_SUSPENDED:
2148 err = -ESTRPIPE;
2149 goto _end_unlock;
2150 default:
2151 break;
2152 }
2153 appl_ptr += frames;
2154 if (appl_ptr >= runtime->boundary)
2155 appl_ptr -= runtime->boundary;
2156 runtime->control->appl_ptr = appl_ptr;
2157 if (substream->ops->ack)
2158 substream->ops->ack(substream);
2159
2160 offset += frames;
2161 size -= frames;
2162 xfer += frames;
2163 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2164 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2165 err = snd_pcm_start(substream);
2166 if (err < 0)
2167 goto _end_unlock;
2168 }
2169 if (runtime->sleep_min &&
2170 runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2171 snd_pcm_tick_prepare(substream);
2172 }
2173 _end_unlock:
2174 snd_pcm_stream_unlock_irq(substream);
2175 _end:
2176 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2177 }
2178
2179 snd_pcm_sframes_t snd_pcm_lib_write(snd_pcm_substream_t *substream, const void __user *buf, snd_pcm_uframes_t size)
2180 {
2181 snd_pcm_runtime_t *runtime;
2182 int nonblock;
2183
2184 snd_assert(substream != NULL, return -ENXIO);
2185 runtime = substream->runtime;
2186 snd_assert(runtime != NULL, return -ENXIO);
2187 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2188 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2189 return -EBADFD;
2190
2191 snd_assert(substream->ffile != NULL, return -ENXIO);
2192 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2193 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2194 if (substream->oss.oss) {
2195 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2196 if (setup != NULL) {
2197 if (setup->nonblock)
2198 nonblock = 1;
2199 else if (setup->block)
2200 nonblock = 0;
2201 }
2202 }
2203 #endif
2204
2205 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2206 runtime->channels > 1)
2207 return -EINVAL;
2208 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2209 snd_pcm_lib_write_transfer);
2210 }
2211
2212 static int snd_pcm_lib_writev_transfer(snd_pcm_substream_t *substream,
2213 unsigned int hwoff,
2214 unsigned long data, unsigned int off,
2215 snd_pcm_uframes_t frames)
2216 {
2217 snd_pcm_runtime_t *runtime = substream->runtime;
2218 int err;
2219 void __user **bufs = (void __user **)data;
2220 int channels = runtime->channels;
2221 int c;
2222 if (substream->ops->copy) {
2223 snd_assert(substream->ops->silence != NULL, return -EINVAL);
2224 for (c = 0; c < channels; ++c, ++bufs) {
2225 if (*bufs == NULL) {
2226 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2227 return err;
2228 } else {
2229 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2230 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2231 return err;
2232 }
2233 }
2234 } else {
2235 /* default transfer behaviour */
2236 size_t dma_csize = runtime->dma_bytes / channels;
2237 snd_assert(runtime->dma_area, return -EFAULT);
2238 for (c = 0; c < channels; ++c, ++bufs) {
2239 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2240 if (*bufs == NULL) {
2241 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2242 } else {
2243 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2244 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2245 return -EFAULT;
2246 }
2247 }
2248 }
2249 return 0;
2250 }
2251
2252 snd_pcm_sframes_t snd_pcm_lib_writev(snd_pcm_substream_t *substream,
2253 void __user **bufs,
2254 snd_pcm_uframes_t frames)
2255 {
2256 snd_pcm_runtime_t *runtime;
2257 int nonblock;
2258
2259 snd_assert(substream != NULL, return -ENXIO);
2260 runtime = substream->runtime;
2261 snd_assert(runtime != NULL, return -ENXIO);
2262 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2263 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2264 return -EBADFD;
2265
2266 snd_assert(substream->ffile != NULL, return -ENXIO);
2267 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2268 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2269 if (substream->oss.oss) {
2270 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2271 if (setup != NULL) {
2272 if (setup->nonblock)
2273 nonblock = 1;
2274 else if (setup->block)
2275 nonblock = 0;
2276 }
2277 }
2278 #endif
2279
2280 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2281 return -EINVAL;
2282 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2283 nonblock, snd_pcm_lib_writev_transfer);
2284 }
2285
2286 static int snd_pcm_lib_read_transfer(snd_pcm_substream_t *substream,
2287 unsigned int hwoff,
2288 unsigned long data, unsigned int off,
2289 snd_pcm_uframes_t frames)
2290 {
2291 snd_pcm_runtime_t *runtime = substream->runtime;
2292 int err;
2293 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2294 if (substream->ops->copy) {
2295 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2296 return err;
2297 } else {
2298 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2299 snd_assert(runtime->dma_area, return -EFAULT);
2300 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2301 return -EFAULT;
2302 }
2303 return 0;
2304 }
2305
2306 static snd_pcm_sframes_t snd_pcm_lib_read1(snd_pcm_substream_t *substream,
2307 unsigned long data,
2308 snd_pcm_uframes_t size,
2309 int nonblock,
2310 transfer_f transfer)
2311 {
2312 snd_pcm_runtime_t *runtime = substream->runtime;
2313 snd_pcm_uframes_t xfer = 0;
2314 snd_pcm_uframes_t offset = 0;
2315 int err = 0;
2316
2317 if (size == 0)
2318 return 0;
2319 if (size > runtime->xfer_align)
2320 size -= size % runtime->xfer_align;
2321
2322 snd_pcm_stream_lock_irq(substream);
2323 switch (runtime->status->state) {
2324 case SNDRV_PCM_STATE_PREPARED:
2325 if (size >= runtime->start_threshold) {
2326 err = snd_pcm_start(substream);
2327 if (err < 0)
2328 goto _end_unlock;
2329 }
2330 break;
2331 case SNDRV_PCM_STATE_DRAINING:
2332 case SNDRV_PCM_STATE_RUNNING:
2333 case SNDRV_PCM_STATE_PAUSED:
2334 break;
2335 case SNDRV_PCM_STATE_XRUN:
2336 err = -EPIPE;
2337 goto _end_unlock;
2338 case SNDRV_PCM_STATE_SUSPENDED:
2339 err = -ESTRPIPE;
2340 goto _end_unlock;
2341 default:
2342 err = -EBADFD;
2343 goto _end_unlock;
2344 }
2345
2346 while (size > 0) {
2347 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2348 snd_pcm_uframes_t avail;
2349 snd_pcm_uframes_t cont;
2350 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2351 snd_pcm_update_hw_ptr(substream);
2352 __draining:
2353 avail = snd_pcm_capture_avail(runtime);
2354 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2355 if (avail < runtime->xfer_align) {
2356 err = -EPIPE;
2357 goto _end_unlock;
2358 }
2359 } else if ((avail < runtime->control->avail_min && size > avail) ||
2360 (size >= runtime->xfer_align && avail < runtime->xfer_align)) {
2361 wait_queue_t wait;
2362 enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED } state;
2363 long tout;
2364
2365 if (nonblock) {
2366 err = -EAGAIN;
2367 goto _end_unlock;
2368 }
2369
2370 init_waitqueue_entry(&wait, current);
2371 add_wait_queue(&runtime->sleep, &wait);
2372 while (1) {
2373 if (signal_pending(current)) {
2374 state = SIGNALED;
2375 break;
2376 }
2377 set_current_state(TASK_INTERRUPTIBLE);
2378 snd_pcm_stream_unlock_irq(substream);
2379 tout = schedule_timeout(10 * HZ);
2380 snd_pcm_stream_lock_irq(substream);
2381 if (tout == 0) {
2382 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2383 runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2384 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2385 break;
2386 }
2387 }
2388 switch (runtime->status->state) {
2389 case SNDRV_PCM_STATE_XRUN:
2390 state = ERROR;
2391 goto _end_loop;
2392 case SNDRV_PCM_STATE_SUSPENDED:
2393 state = SUSPENDED;
2394 goto _end_loop;
2395 case SNDRV_PCM_STATE_DRAINING:
2396 goto __draining;
2397 default:
2398 break;
2399 }
2400 avail = snd_pcm_capture_avail(runtime);
2401 if (avail >= runtime->control->avail_min) {
2402 state = READY;
2403 break;
2404 }
2405 }
2406 _end_loop:
2407 remove_wait_queue(&runtime->sleep, &wait);
2408
2409 switch (state) {
2410 case ERROR:
2411 err = -EPIPE;
2412 goto _end_unlock;
2413 case SUSPENDED:
2414 err = -ESTRPIPE;
2415 goto _end_unlock;
2416 case SIGNALED:
2417 err = -ERESTARTSYS;
2418 goto _end_unlock;
2419 case EXPIRED:
2420 snd_printd("capture read error (DMA or IRQ trouble?)\n");
2421 err = -EIO;
2422 goto _end_unlock;
2423 default:
2424 break;
2425 }
2426 }
2427 if (avail > runtime->xfer_align)
2428 avail -= avail % runtime->xfer_align;
2429 frames = size > avail ? avail : size;
2430 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2431 if (frames > cont)
2432 frames = cont;
2433 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2434 appl_ptr = runtime->control->appl_ptr;
2435 appl_ofs = appl_ptr % runtime->buffer_size;
2436 snd_pcm_stream_unlock_irq(substream);
2437 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2438 goto _end;
2439 snd_pcm_stream_lock_irq(substream);
2440 switch (runtime->status->state) {
2441 case SNDRV_PCM_STATE_XRUN:
2442 err = -EPIPE;
2443 goto _end_unlock;
2444 case SNDRV_PCM_STATE_SUSPENDED:
2445 err = -ESTRPIPE;
2446 goto _end_unlock;
2447 default:
2448 break;
2449 }
2450 appl_ptr += frames;
2451 if (appl_ptr >= runtime->boundary)
2452 appl_ptr -= runtime->boundary;
2453 runtime->control->appl_ptr = appl_ptr;
2454 if (substream->ops->ack)
2455 substream->ops->ack(substream);
2456
2457 offset += frames;
2458 size -= frames;
2459 xfer += frames;
2460 if (runtime->sleep_min &&
2461 runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2462 snd_pcm_tick_prepare(substream);
2463 }
2464 _end_unlock:
2465 snd_pcm_stream_unlock_irq(substream);
2466 _end:
2467 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2468 }
2469
2470 snd_pcm_sframes_t snd_pcm_lib_read(snd_pcm_substream_t *substream, void __user *buf, snd_pcm_uframes_t size)
2471 {
2472 snd_pcm_runtime_t *runtime;
2473 int nonblock;
2474
2475 snd_assert(substream != NULL, return -ENXIO);
2476 runtime = substream->runtime;
2477 snd_assert(runtime != NULL, return -ENXIO);
2478 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2479 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2480 return -EBADFD;
2481
2482 snd_assert(substream->ffile != NULL, return -ENXIO);
2483 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2484 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2485 if (substream->oss.oss) {
2486 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2487 if (setup != NULL) {
2488 if (setup->nonblock)
2489 nonblock = 1;
2490 else if (setup->block)
2491 nonblock = 0;
2492 }
2493 }
2494 #endif
2495 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2496 return -EINVAL;
2497 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2498 }
2499
2500 static int snd_pcm_lib_readv_transfer(snd_pcm_substream_t *substream,
2501 unsigned int hwoff,
2502 unsigned long data, unsigned int off,
2503 snd_pcm_uframes_t frames)
2504 {
2505 snd_pcm_runtime_t *runtime = substream->runtime;
2506 int err;
2507 void __user **bufs = (void __user **)data;
2508 int channels = runtime->channels;
2509 int c;
2510 if (substream->ops->copy) {
2511 for (c = 0; c < channels; ++c, ++bufs) {
2512 char __user *buf;
2513 if (*bufs == NULL)
2514 continue;
2515 buf = *bufs + samples_to_bytes(runtime, off);
2516 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2517 return err;
2518 }
2519 } else {
2520 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2521 snd_assert(runtime->dma_area, return -EFAULT);
2522 for (c = 0; c < channels; ++c, ++bufs) {
2523 char *hwbuf;
2524 char __user *buf;
2525 if (*bufs == NULL)
2526 continue;
2527
2528 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2529 buf = *bufs + samples_to_bytes(runtime, off);
2530 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2531 return -EFAULT;
2532 }
2533 }
2534 return 0;
2535 }
2536
2537 snd_pcm_sframes_t snd_pcm_lib_readv(snd_pcm_substream_t *substream,
2538 void __user **bufs,
2539 snd_pcm_uframes_t frames)
2540 {
2541 snd_pcm_runtime_t *runtime;
2542 int nonblock;
2543
2544 snd_assert(substream != NULL, return -ENXIO);
2545 runtime = substream->runtime;
2546 snd_assert(runtime != NULL, return -ENXIO);
2547 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2548 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2549 return -EBADFD;
2550
2551 snd_assert(substream->ffile != NULL, return -ENXIO);
2552 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2553 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2554 if (substream->oss.oss) {
2555 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2556 if (setup != NULL) {
2557 if (setup->nonblock)
2558 nonblock = 1;
2559 else if (setup->block)
2560 nonblock = 0;
2561 }
2562 }
2563 #endif
2564
2565 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2566 return -EINVAL;
2567 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2568 }
2569
2570 /*
2571 * Exported symbols
2572 */
2573
2574 EXPORT_SYMBOL(snd_interval_refine);
2575 EXPORT_SYMBOL(snd_interval_list);
2576 EXPORT_SYMBOL(snd_interval_ratnum);
2577 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
2578 EXPORT_SYMBOL(_snd_pcm_hw_param_min);
2579 EXPORT_SYMBOL(_snd_pcm_hw_param_set);
2580 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
2581 EXPORT_SYMBOL(_snd_pcm_hw_param_setinteger);
2582 EXPORT_SYMBOL(snd_pcm_hw_param_value_min);
2583 EXPORT_SYMBOL(snd_pcm_hw_param_value_max);
2584 EXPORT_SYMBOL(snd_pcm_hw_param_mask);
2585 EXPORT_SYMBOL(snd_pcm_hw_param_first);
2586 EXPORT_SYMBOL(snd_pcm_hw_param_last);
2587 EXPORT_SYMBOL(snd_pcm_hw_param_near);
2588 EXPORT_SYMBOL(snd_pcm_hw_param_set);
2589 EXPORT_SYMBOL(snd_pcm_hw_refine);
2590 EXPORT_SYMBOL(snd_pcm_hw_constraints_init);
2591 EXPORT_SYMBOL(snd_pcm_hw_constraints_complete);
2592 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
2593 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
2594 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
2595 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
2596 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
2597 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
2598 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
2599 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
2600 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
2601 EXPORT_SYMBOL(snd_pcm_set_ops);
2602 EXPORT_SYMBOL(snd_pcm_set_sync);
2603 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
2604 EXPORT_SYMBOL(snd_pcm_stop);
2605 EXPORT_SYMBOL(snd_pcm_period_elapsed);
2606 EXPORT_SYMBOL(snd_pcm_lib_write);
2607 EXPORT_SYMBOL(snd_pcm_lib_read);
2608 EXPORT_SYMBOL(snd_pcm_lib_writev);
2609 EXPORT_SYMBOL(snd_pcm_lib_readv);
2610 EXPORT_SYMBOL(snd_pcm_lib_buffer_bytes);
2611 EXPORT_SYMBOL(snd_pcm_lib_period_bytes);
2612 /* pcm_memory.c */
2613 EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
2614 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages);
2615 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all);
2616 EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
2617 EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
2618 EXPORT_SYMBOL(snd_pcm_lib_free_pages);