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 void _snd_pcm_hw_param_any(snd_pcm_hw_params_t *params, snd_pcm_hw_param_t var)
1147 {
1148 if (hw_is_mask(var)) {
1149 snd_mask_any(hw_param_mask(params, var));
1150 params->cmask |= 1 << var;
1151 params->rmask |= 1 << var;
1152 return;
1153 }
1154 if (hw_is_interval(var)) {
1155 snd_interval_any(hw_param_interval(params, var));
1156 params->cmask |= 1 << var;
1157 params->rmask |= 1 << var;
1158 return;
1159 }
1160 snd_BUG();
1161 }
1162
1163 /**
1164 * snd_pcm_hw_param_any
1165 */
1166 int snd_pcm_hw_param_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1167 snd_pcm_hw_param_t var)
1168 {
1169 _snd_pcm_hw_param_any(params, var);
1170 return snd_pcm_hw_refine(pcm, params);
1171 }
1172
1173 void _snd_pcm_hw_params_any(snd_pcm_hw_params_t *params)
1174 {
1175 unsigned int k;
1176 memset(params, 0, sizeof(*params));
1177 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1178 _snd_pcm_hw_param_any(params, k);
1179 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1180 _snd_pcm_hw_param_any(params, k);
1181 params->info = ~0U;
1182 }
1183
1184 /**
1185 * snd_pcm_hw_params_any
1186 *
1187 * Fill PARAMS with full configuration space boundaries
1188 */
1189 int snd_pcm_hw_params_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
1190 {
1191 _snd_pcm_hw_params_any(params);
1192 return snd_pcm_hw_refine(pcm, params);
1193 }
1194
1195 /**
1196 * snd_pcm_hw_param_value
1197 *
1198 * Return the value for field PAR if it's fixed in configuration space
1199 * defined by PARAMS. Return -EINVAL otherwise
1200 */
1201 int snd_pcm_hw_param_value(const snd_pcm_hw_params_t *params,
1202 snd_pcm_hw_param_t var, int *dir)
1203 {
1204 if (hw_is_mask(var)) {
1205 const snd_mask_t *mask = hw_param_mask_c(params, var);
1206 if (!snd_mask_single(mask))
1207 return -EINVAL;
1208 if (dir)
1209 *dir = 0;
1210 return snd_mask_value(mask);
1211 }
1212 if (hw_is_interval(var)) {
1213 const snd_interval_t *i = hw_param_interval_c(params, var);
1214 if (!snd_interval_single(i))
1215 return -EINVAL;
1216 if (dir)
1217 *dir = i->openmin;
1218 return snd_interval_value(i);
1219 }
1220 assert(0);
1221 return -EINVAL;
1222 }
1223
1224 /**
1225 * snd_pcm_hw_param_value_min
1226 *
1227 * Return the minimum value for field PAR.
1228 */
1229 unsigned int snd_pcm_hw_param_value_min(const snd_pcm_hw_params_t *params,
1230 snd_pcm_hw_param_t var, int *dir)
1231 {
1232 if (hw_is_mask(var)) {
1233 if (dir)
1234 *dir = 0;
1235 return snd_mask_min(hw_param_mask_c(params, var));
1236 }
1237 if (hw_is_interval(var)) {
1238 const snd_interval_t *i = hw_param_interval_c(params, var);
1239 if (dir)
1240 *dir = i->openmin;
1241 return snd_interval_min(i);
1242 }
1243 assert(0);
1244 return -EINVAL;
1245 }
1246
1247 /**
1248 * snd_pcm_hw_param_value_max
1249 *
1250 * Return the maximum value for field PAR.
1251 */
1252 unsigned int snd_pcm_hw_param_value_max(const snd_pcm_hw_params_t *params,
1253 snd_pcm_hw_param_t var, int *dir)
1254 {
1255 if (hw_is_mask(var)) {
1256 if (dir)
1257 *dir = 0;
1258 return snd_mask_max(hw_param_mask_c(params, var));
1259 }
1260 if (hw_is_interval(var)) {
1261 const snd_interval_t *i = hw_param_interval_c(params, var);
1262 if (dir)
1263 *dir = - (int) i->openmax;
1264 return snd_interval_max(i);
1265 }
1266 assert(0);
1267 return -EINVAL;
1268 }
1269
1270 void _snd_pcm_hw_param_setempty(snd_pcm_hw_params_t *params,
1271 snd_pcm_hw_param_t var)
1272 {
1273 if (hw_is_mask(var)) {
1274 snd_mask_none(hw_param_mask(params, var));
1275 params->cmask |= 1 << var;
1276 params->rmask |= 1 << var;
1277 } else if (hw_is_interval(var)) {
1278 snd_interval_none(hw_param_interval(params, var));
1279 params->cmask |= 1 << var;
1280 params->rmask |= 1 << var;
1281 } else {
1282 snd_BUG();
1283 }
1284 }
1285
1286 int _snd_pcm_hw_param_setinteger(snd_pcm_hw_params_t *params,
1287 snd_pcm_hw_param_t var)
1288 {
1289 int changed;
1290 assert(hw_is_interval(var));
1291 changed = snd_interval_setinteger(hw_param_interval(params, var));
1292 if (changed) {
1293 params->cmask |= 1 << var;
1294 params->rmask |= 1 << var;
1295 }
1296 return changed;
1297 }
1298
1299 /**
1300 * snd_pcm_hw_param_setinteger
1301 *
1302 * Inside configuration space defined by PARAMS remove from PAR all
1303 * non integer values. Reduce configuration space accordingly.
1304 * Return -EINVAL if the configuration space is empty
1305 */
1306 int snd_pcm_hw_param_setinteger(snd_pcm_t *pcm,
1307 snd_pcm_hw_params_t *params,
1308 snd_pcm_hw_param_t var)
1309 {
1310 int changed = _snd_pcm_hw_param_setinteger(params, var);
1311 if (changed < 0)
1312 return changed;
1313 if (params->rmask) {
1314 int err = snd_pcm_hw_refine(pcm, params);
1315 if (err < 0)
1316 return err;
1317 }
1318 return 0;
1319 }
1320
1321 int _snd_pcm_hw_param_first(snd_pcm_hw_params_t *params,
1322 snd_pcm_hw_param_t var)
1323 {
1324 int changed;
1325 if (hw_is_mask(var))
1326 changed = snd_mask_refine_first(hw_param_mask(params, var));
1327 else if (hw_is_interval(var))
1328 changed = snd_interval_refine_first(hw_param_interval(params, var));
1329 else {
1330 assert(0);
1331 return -EINVAL;
1332 }
1333 if (changed) {
1334 params->cmask |= 1 << var;
1335 params->rmask |= 1 << var;
1336 }
1337 return changed;
1338 }
1339
1340
1341 /**
1342 * snd_pcm_hw_param_first
1343 *
1344 * Inside configuration space defined by PARAMS remove from PAR all
1345 * values > minimum. Reduce configuration space accordingly.
1346 * Return the minimum.
1347 */
1348 int snd_pcm_hw_param_first(snd_pcm_t *pcm,
1349 snd_pcm_hw_params_t *params,
1350 snd_pcm_hw_param_t var, int *dir)
1351 {
1352 int changed = _snd_pcm_hw_param_first(params, var);
1353 if (changed < 0)
1354 return changed;
1355 if (params->rmask) {
1356 int err = snd_pcm_hw_refine(pcm, params);
1357 assert(err >= 0);
1358 }
1359 return snd_pcm_hw_param_value(params, var, dir);
1360 }
1361
1362 int _snd_pcm_hw_param_last(snd_pcm_hw_params_t *params,
1363 snd_pcm_hw_param_t var)
1364 {
1365 int changed;
1366 if (hw_is_mask(var))
1367 changed = snd_mask_refine_last(hw_param_mask(params, var));
1368 else if (hw_is_interval(var))
1369 changed = snd_interval_refine_last(hw_param_interval(params, var));
1370 else {
1371 assert(0);
1372 return -EINVAL;
1373 }
1374 if (changed) {
1375 params->cmask |= 1 << var;
1376 params->rmask |= 1 << var;
1377 }
1378 return changed;
1379 }
1380
1381
1382 /**
1383 * snd_pcm_hw_param_last
1384 *
1385 * Inside configuration space defined by PARAMS remove from PAR all
1386 * values < maximum. Reduce configuration space accordingly.
1387 * Return the maximum.
1388 */
1389 int snd_pcm_hw_param_last(snd_pcm_t *pcm,
1390 snd_pcm_hw_params_t *params,
1391 snd_pcm_hw_param_t var, int *dir)
1392 {
1393 int changed = _snd_pcm_hw_param_last(params, var);
1394 if (changed < 0)
1395 return changed;
1396 if (params->rmask) {
1397 int err = snd_pcm_hw_refine(pcm, params);
1398 assert(err >= 0);
1399 }
1400 return snd_pcm_hw_param_value(params, var, dir);
1401 }
1402
1403 int _snd_pcm_hw_param_min(snd_pcm_hw_params_t *params,
1404 snd_pcm_hw_param_t var, unsigned int val, int dir)
1405 {
1406 int changed;
1407 int open = 0;
1408 if (dir) {
1409 if (dir > 0) {
1410 open = 1;
1411 } else if (dir < 0) {
1412 if (val > 0) {
1413 open = 1;
1414 val--;
1415 }
1416 }
1417 }
1418 if (hw_is_mask(var))
1419 changed = snd_mask_refine_min(hw_param_mask(params, var), val + !!open);
1420 else if (hw_is_interval(var))
1421 changed = snd_interval_refine_min(hw_param_interval(params, var), val, open);
1422 else {
1423 assert(0);
1424 return -EINVAL;
1425 }
1426 if (changed) {
1427 params->cmask |= 1 << var;
1428 params->rmask |= 1 << var;
1429 }
1430 return changed;
1431 }
1432
1433 /**
1434 * snd_pcm_hw_param_min
1435 *
1436 * Inside configuration space defined by PARAMS remove from PAR all
1437 * values < VAL. Reduce configuration space accordingly.
1438 * Return new minimum or -EINVAL if the configuration space is empty
1439 */
1440 int snd_pcm_hw_param_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1441 snd_pcm_hw_param_t var, unsigned int val, int *dir)
1442 {
1443 int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
1444 if (changed < 0)
1445 return changed;
1446 if (params->rmask) {
1447 int err = snd_pcm_hw_refine(pcm, params);
1448 if (err < 0)
1449 return err;
1450 }
1451 return snd_pcm_hw_param_value_min(params, var, dir);
1452 }
1453
1454 int _snd_pcm_hw_param_max(snd_pcm_hw_params_t *params,
1455 snd_pcm_hw_param_t var, unsigned int val, int dir)
1456 {
1457 int changed;
1458 int open = 0;
1459 if (dir) {
1460 if (dir < 0) {
1461 open = 1;
1462 } else if (dir > 0) {
1463 open = 1;
1464 val++;
1465 }
1466 }
1467 if (hw_is_mask(var)) {
1468 if (val == 0 && open) {
1469 snd_mask_none(hw_param_mask(params, var));
1470 changed = -EINVAL;
1471 } else
1472 changed = snd_mask_refine_max(hw_param_mask(params, var), val - !!open);
1473 } else if (hw_is_interval(var))
1474 changed = snd_interval_refine_max(hw_param_interval(params, var), val, open);
1475 else {
1476 assert(0);
1477 return -EINVAL;
1478 }
1479 if (changed) {
1480 params->cmask |= 1 << var;
1481 params->rmask |= 1 << var;
1482 }
1483 return changed;
1484 }
1485
1486 /**
1487 * snd_pcm_hw_param_max
1488 *
1489 * Inside configuration space defined by PARAMS remove from PAR all
1490 * values >= VAL + 1. Reduce configuration space accordingly.
1491 * Return new maximum or -EINVAL if the configuration space is empty
1492 */
1493 int snd_pcm_hw_param_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1494 snd_pcm_hw_param_t var, unsigned int val, int *dir)
1495 {
1496 int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
1497 if (changed < 0)
1498 return changed;
1499 if (params->rmask) {
1500 int err = snd_pcm_hw_refine(pcm, params);
1501 if (err < 0)
1502 return err;
1503 }
1504 return snd_pcm_hw_param_value_max(params, var, dir);
1505 }
1506
1507 int _snd_pcm_hw_param_set(snd_pcm_hw_params_t *params,
1508 snd_pcm_hw_param_t var, unsigned int val, int dir)
1509 {
1510 int changed;
1511 if (hw_is_mask(var)) {
1512 snd_mask_t *m = hw_param_mask(params, var);
1513 if (val == 0 && dir < 0) {
1514 changed = -EINVAL;
1515 snd_mask_none(m);
1516 } else {
1517 if (dir > 0)
1518 val++;
1519 else if (dir < 0)
1520 val--;
1521 changed = snd_mask_refine_set(hw_param_mask(params, var), val);
1522 }
1523 } else if (hw_is_interval(var)) {
1524 snd_interval_t *i = hw_param_interval(params, var);
1525 if (val == 0 && dir < 0) {
1526 changed = -EINVAL;
1527 snd_interval_none(i);
1528 } else if (dir == 0)
1529 changed = snd_interval_refine_set(i, val);
1530 else {
1531 snd_interval_t t;
1532 t.openmin = 1;
1533 t.openmax = 1;
1534 t.empty = 0;
1535 t.integer = 0;
1536 if (dir < 0) {
1537 t.min = val - 1;
1538 t.max = val;
1539 } else {
1540 t.min = val;
1541 t.max = val+1;
1542 }
1543 changed = snd_interval_refine(i, &t);
1544 }
1545 } else {
1546 assert(0);
1547 return -EINVAL;
1548 }
1549 if (changed) {
1550 params->cmask |= 1 << var;
1551 params->rmask |= 1 << var;
1552 }
1553 return changed;
1554 }
1555
1556 /**
1557 * snd_pcm_hw_param_set
1558 *
1559 * Inside configuration space defined by PARAMS remove from PAR all
1560 * values != VAL. Reduce configuration space accordingly.
1561 * Return VAL or -EINVAL if the configuration space is empty
1562 */
1563 int snd_pcm_hw_param_set(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1564 snd_pcm_hw_param_t var, unsigned int val, int dir)
1565 {
1566 int changed = _snd_pcm_hw_param_set(params, var, val, dir);
1567 if (changed < 0)
1568 return changed;
1569 if (params->rmask) {
1570 int err = snd_pcm_hw_refine(pcm, params);
1571 if (err < 0)
1572 return err;
1573 }
1574 return snd_pcm_hw_param_value(params, var, NULL);
1575 }
1576
1577 int _snd_pcm_hw_param_mask(snd_pcm_hw_params_t *params,
1578 snd_pcm_hw_param_t var, const snd_mask_t *val)
1579 {
1580 int changed;
1581 assert(hw_is_mask(var));
1582 changed = snd_mask_refine(hw_param_mask(params, var), val);
1583 if (changed) {
1584 params->cmask |= 1 << var;
1585 params->rmask |= 1 << var;
1586 }
1587 return changed;
1588 }
1589
1590 /**
1591 * snd_pcm_hw_param_mask
1592 *
1593 * Inside configuration space defined by PARAMS remove from PAR all values
1594 * not contained in MASK. Reduce configuration space accordingly.
1595 * This function can be called only for SNDRV_PCM_HW_PARAM_ACCESS,
1596 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1597 * Return 0 on success or -EINVAL
1598 * if the configuration space is empty
1599 */
1600 int snd_pcm_hw_param_mask(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1601 snd_pcm_hw_param_t var, const snd_mask_t *val)
1602 {
1603 int changed = _snd_pcm_hw_param_mask(params, var, val);
1604 if (changed < 0)
1605 return changed;
1606 if (params->rmask) {
1607 int err = snd_pcm_hw_refine(pcm, params);
1608 if (err < 0)
1609 return err;
1610 }
1611 return 0;
1612 }
1613
1614 static int boundary_sub(int a, int adir,
1615 int b, int bdir,
1616 int *c, int *cdir)
1617 {
1618 adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
1619 bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
1620 *c = a - b;
1621 *cdir = adir - bdir;
1622 if (*cdir == -2) {
1623 assert(*c > INT_MIN);
1624 (*c)--;
1625 } else if (*cdir == 2) {
1626 assert(*c < INT_MAX);
1627 (*c)++;
1628 }
1629 return 0;
1630 }
1631
1632 static int boundary_lt(unsigned int a, int adir,
1633 unsigned int b, int bdir)
1634 {
1635 assert(a > 0 || adir >= 0);
1636 assert(b > 0 || bdir >= 0);
1637 if (adir < 0) {
1638 a--;
1639 adir = 1;
1640 } else if (adir > 0)
1641 adir = 1;
1642 if (bdir < 0) {
1643 b--;
1644 bdir = 1;
1645 } else if (bdir > 0)
1646 bdir = 1;
1647 return a < b || (a == b && adir < bdir);
1648 }
1649
1650 /* Return 1 if min is nearer to best than max */
1651 static int boundary_nearer(int min, int mindir,
1652 int best, int bestdir,
1653 int max, int maxdir)
1654 {
1655 int dmin, dmindir;
1656 int dmax, dmaxdir;
1657 boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
1658 boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
1659 return boundary_lt(dmin, dmindir, dmax, dmaxdir);
1660 }
1661
1662 /**
1663 * snd_pcm_hw_param_near
1664 *
1665 * Inside configuration space defined by PARAMS set PAR to the available value
1666 * nearest to VAL. Reduce configuration space accordingly.
1667 * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
1668 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1669 * Return the value found.
1670 */
1671 int snd_pcm_hw_param_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1672 snd_pcm_hw_param_t var, unsigned int best, int *dir)
1673 {
1674 snd_pcm_hw_params_t *save = NULL;
1675 int v;
1676 unsigned int saved_min;
1677 int last = 0;
1678 int min, max;
1679 int mindir, maxdir;
1680 int valdir = dir ? *dir : 0;
1681 /* FIXME */
1682 if (best > INT_MAX)
1683 best = INT_MAX;
1684 min = max = best;
1685 mindir = maxdir = valdir;
1686 if (maxdir > 0)
1687 maxdir = 0;
1688 else if (maxdir == 0)
1689 maxdir = -1;
1690 else {
1691 maxdir = 1;
1692 max--;
1693 }
1694 save = kmalloc(sizeof(*save), GFP_KERNEL);
1695 if (save == NULL)
1696 return -ENOMEM;
1697 *save = *params;
1698 saved_min = min;
1699 min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
1700 if (min >= 0) {
1701 snd_pcm_hw_params_t *params1;
1702 if (max < 0)
1703 goto _end;
1704 if ((unsigned int)min == saved_min && mindir == valdir)
1705 goto _end;
1706 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
1707 if (params1 == NULL) {
1708 kfree(save);
1709 return -ENOMEM;
1710 }
1711 *params1 = *save;
1712 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
1713 if (max < 0) {
1714 kfree(params1);
1715 goto _end;
1716 }
1717 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
1718 *params = *params1;
1719 last = 1;
1720 }
1721 kfree(params1);
1722 } else {
1723 *params = *save;
1724 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
1725 assert(max >= 0);
1726 last = 1;
1727 }
1728 _end:
1729 kfree(save);
1730 if (last)
1731 v = snd_pcm_hw_param_last(pcm, params, var, dir);
1732 else
1733 v = snd_pcm_hw_param_first(pcm, params, var, dir);
1734 assert(v >= 0);
1735 return v;
1736 }
1737
1738 /**
1739 * snd_pcm_hw_param_choose
1740 *
1741 * Choose one configuration from configuration space defined by PARAMS
1742 * The configuration chosen is that obtained fixing in this order:
1743 * first access, first format, first subformat, min channels,
1744 * min rate, min period time, max buffer size, min tick time
1745 */
1746 int snd_pcm_hw_params_choose(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
1747 {
1748 int err;
1749
1750 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_ACCESS, NULL);
1751 assert(err >= 0);
1752
1753 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_FORMAT, NULL);
1754 assert(err >= 0);
1755
1756 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_SUBFORMAT, NULL);
1757 assert(err >= 0);
1758
1759 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_CHANNELS, NULL);
1760 assert(err >= 0);
1761
1762 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_RATE, NULL);
1763 assert(err >= 0);
1764
1765 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_PERIOD_TIME, NULL);
1766 assert(err >= 0);
1767
1768 err = snd_pcm_hw_param_last(pcm, params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL);
1769 assert(err >= 0);
1770
1771 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_TICK_TIME, NULL);
1772 assert(err >= 0);
1773
1774 return 0;
1775 }
1776
1777 #undef snd_pcm_t
1778 #undef assert
1779
1780 static int snd_pcm_lib_ioctl_reset(snd_pcm_substream_t *substream,
1781 void *arg)
1782 {
1783 snd_pcm_runtime_t *runtime = substream->runtime;
1784 unsigned long flags;
1785 snd_pcm_stream_lock_irqsave(substream, flags);
1786 if (snd_pcm_running(substream) &&
1787 snd_pcm_update_hw_ptr(substream) >= 0)
1788 runtime->status->hw_ptr %= runtime->buffer_size;
1789 else
1790 runtime->status->hw_ptr = 0;
1791 snd_pcm_stream_unlock_irqrestore(substream, flags);
1792 return 0;
1793 }
1794
1795 static int snd_pcm_lib_ioctl_channel_info(snd_pcm_substream_t *substream,
1796 void *arg)
1797 {
1798 snd_pcm_channel_info_t *info = arg;
1799 snd_pcm_runtime_t *runtime = substream->runtime;
1800 int width;
1801 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1802 info->offset = -1;
1803 return 0;
1804 }
1805 width = snd_pcm_format_physical_width(runtime->format);
1806 if (width < 0)
1807 return width;
1808 info->offset = 0;
1809 switch (runtime->access) {
1810 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1811 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1812 info->first = info->channel * width;
1813 info->step = runtime->channels * width;
1814 break;
1815 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1816 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1817 {
1818 size_t size = runtime->dma_bytes / runtime->channels;
1819 info->first = info->channel * size * 8;
1820 info->step = width;
1821 break;
1822 }
1823 default:
1824 snd_BUG();
1825 break;
1826 }
1827 return 0;
1828 }
1829
1830 /**
1831 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1832 * @substream: the pcm substream instance
1833 * @cmd: ioctl command
1834 * @arg: ioctl argument
1835 *
1836 * Processes the generic ioctl commands for PCM.
1837 * Can be passed as the ioctl callback for PCM ops.
1838 *
1839 * Returns zero if successful, or a negative error code on failure.
1840 */
1841 int snd_pcm_lib_ioctl(snd_pcm_substream_t *substream,
1842 unsigned int cmd, void *arg)
1843 {
1844 switch (cmd) {
1845 case SNDRV_PCM_IOCTL1_INFO:
1846 return 0;
1847 case SNDRV_PCM_IOCTL1_RESET:
1848 return snd_pcm_lib_ioctl_reset(substream, arg);
1849 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1850 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1851 }
1852 return -ENXIO;
1853 }
1854
1855 /*
1856 * Conditions
1857 */
1858
1859 static void snd_pcm_system_tick_set(snd_pcm_substream_t *substream,
1860 unsigned long ticks)
1861 {
1862 snd_pcm_runtime_t *runtime = substream->runtime;
1863 if (ticks == 0)
1864 del_timer(&runtime->tick_timer);
1865 else {
1866 ticks /= (1000000 / HZ);
1867 if (ticks % (1000000 / HZ))
1868 ticks++;
1869 mod_timer(&runtime->tick_timer, jiffies + ticks);
1870 }
1871 }
1872
1873 /* Temporary alias */
1874 void snd_pcm_tick_set(snd_pcm_substream_t *substream, unsigned long ticks)
1875 {
1876 snd_pcm_system_tick_set(substream, ticks);
1877 }
1878
1879 void snd_pcm_tick_prepare(snd_pcm_substream_t *substream)
1880 {
1881 snd_pcm_runtime_t *runtime = substream->runtime;
1882 snd_pcm_uframes_t frames = ULONG_MAX;
1883 snd_pcm_uframes_t avail, dist;
1884 unsigned int ticks;
1885 u_int64_t n;
1886 u_int32_t r;
1887 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
1888 if (runtime->silence_size >= runtime->boundary) {
1889 frames = 1;
1890 } else if (runtime->silence_size > 0 &&
1891 runtime->silence_filled < runtime->buffer_size) {
1892 snd_pcm_sframes_t noise_dist;
1893 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
1894 snd_assert(noise_dist <= (snd_pcm_sframes_t)runtime->silence_threshold, );
1895 frames = noise_dist - runtime->silence_threshold;
1896 }
1897 avail = snd_pcm_playback_avail(runtime);
1898 } else {
1899 avail = snd_pcm_capture_avail(runtime);
1900 }
1901 if (avail < runtime->control->avail_min) {
1902 snd_pcm_sframes_t n = runtime->control->avail_min - avail;
1903 if (n > 0 && frames > (snd_pcm_uframes_t)n)
1904 frames = n;
1905 }
1906 if (avail < runtime->buffer_size) {
1907 snd_pcm_sframes_t n = runtime->buffer_size - avail;
1908 if (n > 0 && frames > (snd_pcm_uframes_t)n)
1909 frames = n;
1910 }
1911 if (frames == ULONG_MAX) {
1912 snd_pcm_tick_set(substream, 0);
1913 return;
1914 }
1915 dist = runtime->status->hw_ptr - runtime->hw_ptr_base;
1916 /* Distance to next interrupt */
1917 dist = runtime->period_size - dist % runtime->period_size;
1918 if (dist <= frames) {
1919 snd_pcm_tick_set(substream, 0);
1920 return;
1921 }
1922 /* the base time is us */
1923 n = frames;
1924 n *= 1000000;
1925 div64_32(&n, runtime->tick_time * runtime->rate, &r);
1926 ticks = n + (r > 0 ? 1 : 0);
1927 if (ticks < runtime->sleep_min)
1928 ticks = runtime->sleep_min;
1929 snd_pcm_tick_set(substream, (unsigned long) ticks);
1930 }
1931
1932 void snd_pcm_tick_elapsed(snd_pcm_substream_t *substream)
1933 {
1934 snd_pcm_runtime_t *runtime;
1935 unsigned long flags;
1936
1937 snd_assert(substream != NULL, return);
1938 runtime = substream->runtime;
1939 snd_assert(runtime != NULL, return);
1940
1941 snd_pcm_stream_lock_irqsave(substream, flags);
1942 if (!snd_pcm_running(substream) ||
1943 snd_pcm_update_hw_ptr(substream) < 0)
1944 goto _end;
1945 if (runtime->sleep_min)
1946 snd_pcm_tick_prepare(substream);
1947 _end:
1948 snd_pcm_stream_unlock_irqrestore(substream, flags);
1949 }
1950
1951 /**
1952 * snd_pcm_period_elapsed - update the pcm status for the next period
1953 * @substream: the pcm substream instance
1954 *
1955 * This function is called from the interrupt handler when the
1956 * PCM has processed the period size. It will update the current
1957 * pointer, set up the tick, wake up sleepers, etc.
1958 *
1959 * Even if more than one periods have elapsed since the last call, you
1960 * have to call this only once.
1961 */
1962 void snd_pcm_period_elapsed(snd_pcm_substream_t *substream)
1963 {
1964 snd_pcm_runtime_t *runtime;
1965 unsigned long flags;
1966
1967 snd_assert(substream != NULL, return);
1968 runtime = substream->runtime;
1969 snd_assert(runtime != NULL, return);
1970
1971 if (runtime->transfer_ack_begin)
1972 runtime->transfer_ack_begin(substream);
1973
1974 snd_pcm_stream_lock_irqsave(substream, flags);
1975 if (!snd_pcm_running(substream) ||
1976 snd_pcm_update_hw_ptr_interrupt(substream) < 0)
1977 goto _end;
1978
1979 if (substream->timer_running)
1980 snd_timer_interrupt(substream->timer, 1);
1981 if (runtime->sleep_min)
1982 snd_pcm_tick_prepare(substream);
1983 _end:
1984 snd_pcm_stream_unlock_irqrestore(substream, flags);
1985 if (runtime->transfer_ack_end)
1986 runtime->transfer_ack_end(substream);
1987 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1988 }
1989
1990 static int snd_pcm_lib_write_transfer(snd_pcm_substream_t *substream,
1991 unsigned int hwoff,
1992 unsigned long data, unsigned int off,
1993 snd_pcm_uframes_t frames)
1994 {
1995 snd_pcm_runtime_t *runtime = substream->runtime;
1996 int err;
1997 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1998 if (substream->ops->copy) {
1999 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2000 return err;
2001 } else {
2002 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2003 snd_assert(runtime->dma_area, return -EFAULT);
2004 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
2005 return -EFAULT;
2006 }
2007 return 0;
2008 }
2009
2010 typedef int (*transfer_f)(snd_pcm_substream_t *substream, unsigned int hwoff,
2011 unsigned long data, unsigned int off,
2012 snd_pcm_uframes_t size);
2013
2014 static snd_pcm_sframes_t snd_pcm_lib_write1(snd_pcm_substream_t *substream,
2015 unsigned long data,
2016 snd_pcm_uframes_t size,
2017 int nonblock,
2018 transfer_f transfer)
2019 {
2020 snd_pcm_runtime_t *runtime = substream->runtime;
2021 snd_pcm_uframes_t xfer = 0;
2022 snd_pcm_uframes_t offset = 0;
2023 int err = 0;
2024
2025 if (size == 0)
2026 return 0;
2027 if (size > runtime->xfer_align)
2028 size -= size % runtime->xfer_align;
2029
2030 snd_pcm_stream_lock_irq(substream);
2031 switch (runtime->status->state) {
2032 case SNDRV_PCM_STATE_PREPARED:
2033 case SNDRV_PCM_STATE_RUNNING:
2034 case SNDRV_PCM_STATE_PAUSED:
2035 break;
2036 case SNDRV_PCM_STATE_XRUN:
2037 err = -EPIPE;
2038 goto _end_unlock;
2039 case SNDRV_PCM_STATE_SUSPENDED:
2040 err = -ESTRPIPE;
2041 goto _end_unlock;
2042 default:
2043 err = -EBADFD;
2044 goto _end_unlock;
2045 }
2046
2047 while (size > 0) {
2048 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2049 snd_pcm_uframes_t avail;
2050 snd_pcm_uframes_t cont;
2051 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2052 snd_pcm_update_hw_ptr(substream);
2053 avail = snd_pcm_playback_avail(runtime);
2054 if (((avail < runtime->control->avail_min && size > avail) ||
2055 (size >= runtime->xfer_align && avail < runtime->xfer_align))) {
2056 wait_queue_t wait;
2057 enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED } state;
2058 long tout;
2059
2060 if (nonblock) {
2061 err = -EAGAIN;
2062 goto _end_unlock;
2063 }
2064
2065 init_waitqueue_entry(&wait, current);
2066 add_wait_queue(&runtime->sleep, &wait);
2067 while (1) {
2068 if (signal_pending(current)) {
2069 state = SIGNALED;
2070 break;
2071 }
2072 set_current_state(TASK_INTERRUPTIBLE);
2073 snd_pcm_stream_unlock_irq(substream);
2074 tout = schedule_timeout(10 * HZ);
2075 snd_pcm_stream_lock_irq(substream);
2076 if (tout == 0) {
2077 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2078 runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2079 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2080 break;
2081 }
2082 }
2083 switch (runtime->status->state) {
2084 case SNDRV_PCM_STATE_XRUN:
2085 case SNDRV_PCM_STATE_DRAINING:
2086 state = ERROR;
2087 goto _end_loop;
2088 case SNDRV_PCM_STATE_SUSPENDED:
2089 state = SUSPENDED;
2090 goto _end_loop;
2091 default:
2092 break;
2093 }
2094 avail = snd_pcm_playback_avail(runtime);
2095 if (avail >= runtime->control->avail_min) {
2096 state = READY;
2097 break;
2098 }
2099 }
2100 _end_loop:
2101 remove_wait_queue(&runtime->sleep, &wait);
2102
2103 switch (state) {
2104 case ERROR:
2105 err = -EPIPE;
2106 goto _end_unlock;
2107 case SUSPENDED:
2108 err = -ESTRPIPE;
2109 goto _end_unlock;
2110 case SIGNALED:
2111 err = -ERESTARTSYS;
2112 goto _end_unlock;
2113 case EXPIRED:
2114 snd_printd("playback write error (DMA or IRQ trouble?)\n");
2115 err = -EIO;
2116 goto _end_unlock;
2117 default:
2118 break;
2119 }
2120 }
2121 if (avail > runtime->xfer_align)
2122 avail -= avail % runtime->xfer_align;
2123 frames = size > avail ? avail : size;
2124 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2125 if (frames > cont)
2126 frames = cont;
2127 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2128 appl_ptr = runtime->control->appl_ptr;
2129 appl_ofs = appl_ptr % runtime->buffer_size;
2130 snd_pcm_stream_unlock_irq(substream);
2131 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2132 goto _end;
2133 snd_pcm_stream_lock_irq(substream);
2134 switch (runtime->status->state) {
2135 case SNDRV_PCM_STATE_XRUN:
2136 err = -EPIPE;
2137 goto _end_unlock;
2138 case SNDRV_PCM_STATE_SUSPENDED:
2139 err = -ESTRPIPE;
2140 goto _end_unlock;
2141 default:
2142 break;
2143 }
2144 appl_ptr += frames;
2145 if (appl_ptr >= runtime->boundary) {
2146 runtime->control->appl_ptr = 0;
2147 } else {
2148 runtime->control->appl_ptr = appl_ptr;
2149 }
2150 if (substream->ops->ack)
2151 substream->ops->ack(substream);
2152
2153 offset += frames;
2154 size -= frames;
2155 xfer += frames;
2156 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2157 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2158 err = snd_pcm_start(substream);
2159 if (err < 0)
2160 goto _end_unlock;
2161 }
2162 if (runtime->sleep_min &&
2163 runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2164 snd_pcm_tick_prepare(substream);
2165 }
2166 _end_unlock:
2167 snd_pcm_stream_unlock_irq(substream);
2168 _end:
2169 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2170 }
2171
2172 snd_pcm_sframes_t snd_pcm_lib_write(snd_pcm_substream_t *substream, const void __user *buf, snd_pcm_uframes_t size)
2173 {
2174 snd_pcm_runtime_t *runtime;
2175 int nonblock;
2176
2177 snd_assert(substream != NULL, return -ENXIO);
2178 runtime = substream->runtime;
2179 snd_assert(runtime != NULL, return -ENXIO);
2180 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2181 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2182 return -EBADFD;
2183
2184 snd_assert(substream->ffile != NULL, return -ENXIO);
2185 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2186 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2187 if (substream->oss.oss) {
2188 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2189 if (setup != NULL) {
2190 if (setup->nonblock)
2191 nonblock = 1;
2192 else if (setup->block)
2193 nonblock = 0;
2194 }
2195 }
2196 #endif
2197
2198 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2199 runtime->channels > 1)
2200 return -EINVAL;
2201 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2202 snd_pcm_lib_write_transfer);
2203 }
2204
2205 static int snd_pcm_lib_writev_transfer(snd_pcm_substream_t *substream,
2206 unsigned int hwoff,
2207 unsigned long data, unsigned int off,
2208 snd_pcm_uframes_t frames)
2209 {
2210 snd_pcm_runtime_t *runtime = substream->runtime;
2211 int err;
2212 void __user **bufs = (void __user **)data;
2213 int channels = runtime->channels;
2214 int c;
2215 if (substream->ops->copy) {
2216 snd_assert(substream->ops->silence != NULL, return -EINVAL);
2217 for (c = 0; c < channels; ++c, ++bufs) {
2218 if (*bufs == NULL) {
2219 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2220 return err;
2221 } else {
2222 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2223 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2224 return err;
2225 }
2226 }
2227 } else {
2228 /* default transfer behaviour */
2229 size_t dma_csize = runtime->dma_bytes / channels;
2230 snd_assert(runtime->dma_area, return -EFAULT);
2231 for (c = 0; c < channels; ++c, ++bufs) {
2232 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2233 if (*bufs == NULL) {
2234 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2235 } else {
2236 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2237 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2238 return -EFAULT;
2239 }
2240 }
2241 }
2242 return 0;
2243 }
2244
2245 snd_pcm_sframes_t snd_pcm_lib_writev(snd_pcm_substream_t *substream,
2246 void __user **bufs,
2247 snd_pcm_uframes_t frames)
2248 {
2249 snd_pcm_runtime_t *runtime;
2250 int nonblock;
2251
2252 snd_assert(substream != NULL, return -ENXIO);
2253 runtime = substream->runtime;
2254 snd_assert(runtime != NULL, return -ENXIO);
2255 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2256 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2257 return -EBADFD;
2258
2259 snd_assert(substream->ffile != NULL, return -ENXIO);
2260 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2261 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2262 if (substream->oss.oss) {
2263 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2264 if (setup != NULL) {
2265 if (setup->nonblock)
2266 nonblock = 1;
2267 else if (setup->block)
2268 nonblock = 0;
2269 }
2270 }
2271 #endif
2272
2273 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2274 return -EINVAL;
2275 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2276 nonblock, snd_pcm_lib_writev_transfer);
2277 }
2278
2279 static int snd_pcm_lib_read_transfer(snd_pcm_substream_t *substream,
2280 unsigned int hwoff,
2281 unsigned long data, unsigned int off,
2282 snd_pcm_uframes_t frames)
2283 {
2284 snd_pcm_runtime_t *runtime = substream->runtime;
2285 int err;
2286 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2287 if (substream->ops->copy) {
2288 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2289 return err;
2290 } else {
2291 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2292 snd_assert(runtime->dma_area, return -EFAULT);
2293 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2294 return -EFAULT;
2295 }
2296 return 0;
2297 }
2298
2299 static snd_pcm_sframes_t snd_pcm_lib_read1(snd_pcm_substream_t *substream,
2300 unsigned long data,
2301 snd_pcm_uframes_t size,
2302 int nonblock,
2303 transfer_f transfer)
2304 {
2305 snd_pcm_runtime_t *runtime = substream->runtime;
2306 snd_pcm_uframes_t xfer = 0;
2307 snd_pcm_uframes_t offset = 0;
2308 int err = 0;
2309
2310 if (size == 0)
2311 return 0;
2312 if (size > runtime->xfer_align)
2313 size -= size % runtime->xfer_align;
2314
2315 snd_pcm_stream_lock_irq(substream);
2316 switch (runtime->status->state) {
2317 case SNDRV_PCM_STATE_PREPARED:
2318 if (size >= runtime->start_threshold) {
2319 err = snd_pcm_start(substream);
2320 if (err < 0)
2321 goto _end_unlock;
2322 }
2323 break;
2324 case SNDRV_PCM_STATE_DRAINING:
2325 case SNDRV_PCM_STATE_RUNNING:
2326 case SNDRV_PCM_STATE_PAUSED:
2327 break;
2328 case SNDRV_PCM_STATE_XRUN:
2329 err = -EPIPE;
2330 goto _end_unlock;
2331 case SNDRV_PCM_STATE_SUSPENDED:
2332 err = -ESTRPIPE;
2333 goto _end_unlock;
2334 default:
2335 err = -EBADFD;
2336 goto _end_unlock;
2337 }
2338
2339 while (size > 0) {
2340 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2341 snd_pcm_uframes_t avail;
2342 snd_pcm_uframes_t cont;
2343 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2344 snd_pcm_update_hw_ptr(substream);
2345 __draining:
2346 avail = snd_pcm_capture_avail(runtime);
2347 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2348 if (avail < runtime->xfer_align) {
2349 err = -EPIPE;
2350 goto _end_unlock;
2351 }
2352 } else if ((avail < runtime->control->avail_min && size > avail) ||
2353 (size >= runtime->xfer_align && avail < runtime->xfer_align)) {
2354 wait_queue_t wait;
2355 enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED } state;
2356 long tout;
2357
2358 if (nonblock) {
2359 err = -EAGAIN;
2360 goto _end_unlock;
2361 }
2362
2363 init_waitqueue_entry(&wait, current);
2364 add_wait_queue(&runtime->sleep, &wait);
2365 while (1) {
2366 if (signal_pending(current)) {
2367 state = SIGNALED;
2368 break;
2369 }
2370 set_current_state(TASK_INTERRUPTIBLE);
2371 snd_pcm_stream_unlock_irq(substream);
2372 tout = schedule_timeout(10 * HZ);
2373 snd_pcm_stream_lock_irq(substream);
2374 if (tout == 0) {
2375 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2376 runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2377 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2378 break;
2379 }
2380 }
2381 switch (runtime->status->state) {
2382 case SNDRV_PCM_STATE_XRUN:
2383 state = ERROR;
2384 goto _end_loop;
2385 case SNDRV_PCM_STATE_SUSPENDED:
2386 state = SUSPENDED;
2387 goto _end_loop;
2388 case SNDRV_PCM_STATE_DRAINING:
2389 goto __draining;
2390 default:
2391 break;
2392 }
2393 avail = snd_pcm_capture_avail(runtime);
2394 if (avail >= runtime->control->avail_min) {
2395 state = READY;
2396 break;
2397 }
2398 }
2399 _end_loop:
2400 remove_wait_queue(&runtime->sleep, &wait);
2401
2402 switch (state) {
2403 case ERROR:
2404 err = -EPIPE;
2405 goto _end_unlock;
2406 case SUSPENDED:
2407 err = -ESTRPIPE;
2408 goto _end_unlock;
2409 case SIGNALED:
2410 err = -ERESTARTSYS;
2411 goto _end_unlock;
2412 case EXPIRED:
2413 snd_printd("capture read error (DMA or IRQ trouble?)\n");
2414 err = -EIO;
2415 goto _end_unlock;
2416 default:
2417 break;
2418 }
2419 }
2420 if (avail > runtime->xfer_align)
2421 avail -= avail % runtime->xfer_align;
2422 frames = size > avail ? avail : size;
2423 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2424 if (frames > cont)
2425 frames = cont;
2426 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2427 appl_ptr = runtime->control->appl_ptr;
2428 appl_ofs = appl_ptr % runtime->buffer_size;
2429 snd_pcm_stream_unlock_irq(substream);
2430 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2431 goto _end;
2432 snd_pcm_stream_lock_irq(substream);
2433 switch (runtime->status->state) {
2434 case SNDRV_PCM_STATE_XRUN:
2435 err = -EPIPE;
2436 goto _end_unlock;
2437 case SNDRV_PCM_STATE_SUSPENDED:
2438 err = -ESTRPIPE;
2439 goto _end_unlock;
2440 default:
2441 break;
2442 }
2443 appl_ptr += frames;
2444 if (appl_ptr >= runtime->boundary) {
2445 runtime->control->appl_ptr = 0;
2446 } else {
2447 runtime->control->appl_ptr = appl_ptr;
2448 }
2449 if (substream->ops->ack)
2450 substream->ops->ack(substream);
2451
2452 offset += frames;
2453 size -= frames;
2454 xfer += frames;
2455 if (runtime->sleep_min &&
2456 runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2457 snd_pcm_tick_prepare(substream);
2458 }
2459 _end_unlock:
2460 snd_pcm_stream_unlock_irq(substream);
2461 _end:
2462 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2463 }
2464
2465 snd_pcm_sframes_t snd_pcm_lib_read(snd_pcm_substream_t *substream, void __user *buf, snd_pcm_uframes_t size)
2466 {
2467 snd_pcm_runtime_t *runtime;
2468 int nonblock;
2469
2470 snd_assert(substream != NULL, return -ENXIO);
2471 runtime = substream->runtime;
2472 snd_assert(runtime != NULL, return -ENXIO);
2473 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2474 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2475 return -EBADFD;
2476
2477 snd_assert(substream->ffile != NULL, return -ENXIO);
2478 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2479 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2480 if (substream->oss.oss) {
2481 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2482 if (setup != NULL) {
2483 if (setup->nonblock)
2484 nonblock = 1;
2485 else if (setup->block)
2486 nonblock = 0;
2487 }
2488 }
2489 #endif
2490 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2491 return -EINVAL;
2492 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2493 }
2494
2495 static int snd_pcm_lib_readv_transfer(snd_pcm_substream_t *substream,
2496 unsigned int hwoff,
2497 unsigned long data, unsigned int off,
2498 snd_pcm_uframes_t frames)
2499 {
2500 snd_pcm_runtime_t *runtime = substream->runtime;
2501 int err;
2502 void __user **bufs = (void __user **)data;
2503 int channels = runtime->channels;
2504 int c;
2505 if (substream->ops->copy) {
2506 for (c = 0; c < channels; ++c, ++bufs) {
2507 char __user *buf;
2508 if (*bufs == NULL)
2509 continue;
2510 buf = *bufs + samples_to_bytes(runtime, off);
2511 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2512 return err;
2513 }
2514 } else {
2515 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2516 snd_assert(runtime->dma_area, return -EFAULT);
2517 for (c = 0; c < channels; ++c, ++bufs) {
2518 char *hwbuf;
2519 char __user *buf;
2520 if (*bufs == NULL)
2521 continue;
2522
2523 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2524 buf = *bufs + samples_to_bytes(runtime, off);
2525 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2526 return -EFAULT;
2527 }
2528 }
2529 return 0;
2530 }
2531
2532 snd_pcm_sframes_t snd_pcm_lib_readv(snd_pcm_substream_t *substream,
2533 void __user **bufs,
2534 snd_pcm_uframes_t frames)
2535 {
2536 snd_pcm_runtime_t *runtime;
2537 int nonblock;
2538
2539 snd_assert(substream != NULL, return -ENXIO);
2540 runtime = substream->runtime;
2541 snd_assert(runtime != NULL, return -ENXIO);
2542 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2543 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2544 return -EBADFD;
2545
2546 snd_assert(substream->ffile != NULL, return -ENXIO);
2547 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2548 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2549 if (substream->oss.oss) {
2550 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2551 if (setup != NULL) {
2552 if (setup->nonblock)
2553 nonblock = 1;
2554 else if (setup->block)
2555 nonblock = 0;
2556 }
2557 }
2558 #endif
2559
2560 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2561 return -EINVAL;
2562 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2563 }
2564
2565 /*
2566 * Exported symbols
2567 */
2568
2569 EXPORT_SYMBOL(snd_interval_refine);
2570 EXPORT_SYMBOL(snd_interval_list);
2571 EXPORT_SYMBOL(snd_interval_ratnum);
2572 EXPORT_SYMBOL(snd_interval_muldivk);
2573 EXPORT_SYMBOL(snd_interval_mulkdiv);
2574 EXPORT_SYMBOL(snd_interval_div);
2575 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
2576 EXPORT_SYMBOL(_snd_pcm_hw_param_min);
2577 EXPORT_SYMBOL(_snd_pcm_hw_param_set);
2578 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
2579 EXPORT_SYMBOL(_snd_pcm_hw_param_setinteger);
2580 EXPORT_SYMBOL(snd_pcm_hw_param_value_min);
2581 EXPORT_SYMBOL(snd_pcm_hw_param_value_max);
2582 EXPORT_SYMBOL(snd_pcm_hw_param_mask);
2583 EXPORT_SYMBOL(snd_pcm_hw_param_first);
2584 EXPORT_SYMBOL(snd_pcm_hw_param_last);
2585 EXPORT_SYMBOL(snd_pcm_hw_param_near);
2586 EXPORT_SYMBOL(snd_pcm_hw_param_set);
2587 EXPORT_SYMBOL(snd_pcm_hw_refine);
2588 EXPORT_SYMBOL(snd_pcm_hw_params);
2589 EXPORT_SYMBOL(snd_pcm_hw_constraints_init);
2590 EXPORT_SYMBOL(snd_pcm_hw_constraints_complete);
2591 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
2592 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
2593 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
2594 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
2595 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
2596 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
2597 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
2598 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
2599 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
2600 EXPORT_SYMBOL(snd_pcm_set_ops);
2601 EXPORT_SYMBOL(snd_pcm_set_sync);
2602 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
2603 EXPORT_SYMBOL(snd_pcm_stop);
2604 EXPORT_SYMBOL(snd_pcm_period_elapsed);
2605 EXPORT_SYMBOL(snd_pcm_lib_write);
2606 EXPORT_SYMBOL(snd_pcm_lib_read);
2607 EXPORT_SYMBOL(snd_pcm_lib_writev);
2608 EXPORT_SYMBOL(snd_pcm_lib_readv);
2609 EXPORT_SYMBOL(snd_pcm_lib_buffer_bytes);
2610 EXPORT_SYMBOL(snd_pcm_lib_period_bytes);
2611 /* pcm_memory.c */
2612 EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
2613 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages);
2614 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all);
2615 EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
2616 EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
2617 EXPORT_SYMBOL(snd_pcm_lib_free_pages);
2618
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