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[ALSA] Sasha Khapyorsky: My email address is changed, there is update.
[deliverable/linux.git] / sound / core / pcm_lib.c
CommitLineData
1da177e4
LT		 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 */
42void 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
131static 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
146static 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
166static 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
189static 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 */
236int 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 */
285void 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 */
301void 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
318static 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
329static 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
336static 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
348static 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
357static 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
374static 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
399static 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 */
435int 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
477static 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
489static 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
501static 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
511void 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
df8db936
TI		 527 * @a: dividend
528 * @b: divisor
529 * @c: quotient
1da177e4
LT		 530 *
531 * c = a / b
532 *
533 * Returns non-zero if the value is changed, zero if not changed.
534 */
535void snd_interval_div(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c)
536{
537 unsigned int r;
538 if (a->empty || b->empty) {
539 snd_interval_none(c);
540 return;
541 }
542 c->empty = 0;
543 c->min = div32(a->min, b->max, &r);
544 c->openmin = (r || a->openmin || b->openmax);
545 if (b->min > 0) {
546 c->max = div32(a->max, b->min, &r);
547 if (r) {
548 c->max++;
549 c->openmax = 1;
550 } else
551 c->openmax = (a->openmax || b->openmin);
552 } else {
553 c->max = UINT_MAX;
554 c->openmax = 0;
555 }
556 c->integer = 0;
557}
558
559/**
560 * snd_interval_muldivk - refine the interval value
df8db936
TI		 561 * @a: dividend 1
562 * @b: dividend 2
563 * @k: divisor (as integer)
564 * @c: result
565 *
1da177e4
LT		 566 * c = a * b / k
567 *
568 * Returns non-zero if the value is changed, zero if not changed.
569 */
570void snd_interval_muldivk(const snd_interval_t *a, const snd_interval_t *b,
571 unsigned int k, snd_interval_t *c)
572{
573 unsigned int r;
574 if (a->empty || b->empty) {
575 snd_interval_none(c);
576 return;
577 }
578 c->empty = 0;
579 c->min = muldiv32(a->min, b->min, k, &r);
580 c->openmin = (r || a->openmin || b->openmin);
581 c->max = muldiv32(a->max, b->max, k, &r);
582 if (r) {
583 c->max++;
584 c->openmax = 1;
585 } else
586 c->openmax = (a->openmax || b->openmax);
587 c->integer = 0;
588}
589
590/**
591 * snd_interval_mulkdiv - refine the interval value
df8db936
TI		 592 * @a: dividend 1
593 * @k: dividend 2 (as integer)
594 * @b: divisor
595 * @c: result
1da177e4
LT		 596 *
597 * c = a * k / b
598 *
599 * Returns non-zero if the value is changed, zero if not changed.
600 */
601void snd_interval_mulkdiv(const snd_interval_t *a, unsigned int k,
602 const snd_interval_t *b, snd_interval_t *c)
603{
604 unsigned int r;
605 if (a->empty || b->empty) {
606 snd_interval_none(c);
607 return;
608 }
609 c->empty = 0;
610 c->min = muldiv32(a->min, k, b->max, &r);
611 c->openmin = (r || a->openmin || b->openmax);
612 if (b->min > 0) {
613 c->max = muldiv32(a->max, k, b->min, &r);
614 if (r) {
615 c->max++;
616 c->openmax = 1;
617 } else
618 c->openmax = (a->openmax || b->openmin);
619 } else {
620 c->max = UINT_MAX;
621 c->openmax = 0;
622 }
623 c->integer = 0;
624}
625
626#undef assert
627/* ---- */
628
629
630/**
631 * snd_interval_ratnum - refine the interval value
df8db936
TI		 632 * @i: interval to refine
633 * @rats_count: number of ratnum_t
634 * @rats: ratnum_t array
635 * @nump: pointer to store the resultant numerator
636 * @denp: pointer to store the resultant denominator
1da177e4
LT		 637 *
638 * Returns non-zero if the value is changed, zero if not changed.
639 */
640int snd_interval_ratnum(snd_interval_t *i,
641 unsigned int rats_count, ratnum_t *rats,
642 unsigned int *nump, unsigned int *denp)
643{
644 unsigned int best_num, best_diff, best_den;
645 unsigned int k;
646 snd_interval_t t;
647 int err;
648
649 best_num = best_den = best_diff = 0;
650 for (k = 0; k < rats_count; ++k) {
651 unsigned int num = rats[k].num;
652 unsigned int den;
653 unsigned int q = i->min;
654 int diff;
655 if (q == 0)
656 q = 1;
657 den = div_down(num, q);
658 if (den < rats[k].den_min)
659 continue;
660 if (den > rats[k].den_max)
661 den = rats[k].den_max;
662 else {
663 unsigned int r;
664 r = (den - rats[k].den_min) % rats[k].den_step;
665 if (r != 0)
666 den -= r;
667 }
668 diff = num - q * den;
669 if (best_num == 0 ||
670 diff * best_den < best_diff * den) {
671 best_diff = diff;
672 best_den = den;
673 best_num = num;
674 }
675 }
676 if (best_den == 0) {
677 i->empty = 1;
678 return -EINVAL;
679 }
680 t.min = div_down(best_num, best_den);
681 t.openmin = !!(best_num % best_den);
682
683 best_num = best_den = best_diff = 0;
684 for (k = 0; k < rats_count; ++k) {
685 unsigned int num = rats[k].num;
686 unsigned int den;
687 unsigned int q = i->max;
688 int diff;
689 if (q == 0) {
690 i->empty = 1;
691 return -EINVAL;
692 }
693 den = div_up(num, q);
694 if (den > rats[k].den_max)
695 continue;
696 if (den < rats[k].den_min)
697 den = rats[k].den_min;
698 else {
699 unsigned int r;
700 r = (den - rats[k].den_min) % rats[k].den_step;
701 if (r != 0)
702 den += rats[k].den_step - r;
703 }
704 diff = q * den - num;
705 if (best_num == 0 ||
706 diff * best_den < best_diff * den) {
707 best_diff = diff;
708 best_den = den;
709 best_num = num;
710 }
711 }
712 if (best_den == 0) {
713 i->empty = 1;
714 return -EINVAL;
715 }
716 t.max = div_up(best_num, best_den);
717 t.openmax = !!(best_num % best_den);
718 t.integer = 0;
719 err = snd_interval_refine(i, &t);
720 if (err < 0)
721 return err;
722
723 if (snd_interval_single(i)) {
724 if (nump)
725 *nump = best_num;
726 if (denp)
727 *denp = best_den;
728 }
729 return err;
730}
731
732/**
733 * snd_interval_ratden - refine the interval value
df8db936
TI		 734 * @i: interval to refine
735 * @rats_count: number of ratden_t
736 * @rats: ratden_t array
737 * @nump: pointer to store the resultant numerator
738 * @denp: pointer to store the resultant denominator
1da177e4
LT		 739 *
740 * Returns non-zero if the value is changed, zero if not changed.
741 */
742static int snd_interval_ratden(snd_interval_t *i,
743 unsigned int rats_count, ratden_t *rats,
744 unsigned int *nump, unsigned int *denp)
745{
746 unsigned int best_num, best_diff, best_den;
747 unsigned int k;
748 snd_interval_t t;
749 int err;
750
751 best_num = best_den = best_diff = 0;
752 for (k = 0; k < rats_count; ++k) {
753 unsigned int num;
754 unsigned int den = rats[k].den;
755 unsigned int q = i->min;
756 int diff;
757 num = mul(q, den);
758 if (num > rats[k].num_max)
759 continue;
760 if (num < rats[k].num_min)
761 num = rats[k].num_max;
762 else {
763 unsigned int r;
764 r = (num - rats[k].num_min) % rats[k].num_step;
765 if (r != 0)
766 num += rats[k].num_step - r;
767 }
768 diff = num - q * den;
769 if (best_num == 0 ||
770 diff * best_den < best_diff * den) {
771 best_diff = diff;
772 best_den = den;
773 best_num = num;
774 }
775 }
776 if (best_den == 0) {
777 i->empty = 1;
778 return -EINVAL;
779 }
780 t.min = div_down(best_num, best_den);
781 t.openmin = !!(best_num % best_den);
782
783 best_num = best_den = best_diff = 0;
784 for (k = 0; k < rats_count; ++k) {
785 unsigned int num;
786 unsigned int den = rats[k].den;
787 unsigned int q = i->max;
788 int diff;
789 num = mul(q, den);
790 if (num < rats[k].num_min)
791 continue;
792 if (num > rats[k].num_max)
793 num = rats[k].num_max;
794 else {
795 unsigned int r;
796 r = (num - rats[k].num_min) % rats[k].num_step;
797 if (r != 0)
798 num -= r;
799 }
800 diff = q * den - num;
801 if (best_num == 0 ||
802 diff * best_den < best_diff * den) {
803 best_diff = diff;
804 best_den = den;
805 best_num = num;
806 }
807 }
808 if (best_den == 0) {
809 i->empty = 1;
810 return -EINVAL;
811 }
812 t.max = div_up(best_num, best_den);
813 t.openmax = !!(best_num % best_den);
814 t.integer = 0;
815 err = snd_interval_refine(i, &t);
816 if (err < 0)
817 return err;
818
819 if (snd_interval_single(i)) {
820 if (nump)
821 *nump = best_num;
822 if (denp)
823 *denp = best_den;
824 }
825 return err;
826}
827
828/**
829 * snd_interval_list - refine the interval value from the list
830 * @i: the interval value to refine
831 * @count: the number of elements in the list
832 * @list: the value list
833 * @mask: the bit-mask to evaluate
834 *
835 * Refines the interval value from the list.
836 * When mask is non-zero, only the elements corresponding to bit 1 are
837 * evaluated.
838 *
839 * Returns non-zero if the value is changed, zero if not changed.
840 */
841int snd_interval_list(snd_interval_t *i, unsigned int count, unsigned int *list, unsigned int mask)
842{
843 unsigned int k;
844 int changed = 0;
845 for (k = 0; k < count; k++) {
846 if (mask && !(mask & (1 << k)))
847 continue;
848 if (i->min == list[k] && !i->openmin)
849 goto _l1;
850 if (i->min < list[k]) {
851 i->min = list[k];
852 i->openmin = 0;
853 changed = 1;
854 goto _l1;
855 }
856 }
857 i->empty = 1;
858 return -EINVAL;
859 _l1:
860 for (k = count; k-- > 0;) {
861 if (mask && !(mask & (1 << k)))
862 continue;
863 if (i->max == list[k] && !i->openmax)
864 goto _l2;
865 if (i->max > list[k]) {
866 i->max = list[k];
867 i->openmax = 0;
868 changed = 1;
869 goto _l2;
870 }
871 }
872 i->empty = 1;
873 return -EINVAL;
874 _l2:
875 if (snd_interval_checkempty(i)) {
876 i->empty = 1;
877 return -EINVAL;
878 }
879 return changed;
880}
881
882static int snd_interval_step(snd_interval_t *i, unsigned int min, unsigned int step)
883{
884 unsigned int n;
885 int changed = 0;
886 n = (i->min - min) % step;
887 if (n != 0 || i->openmin) {
888 i->min += step - n;
889 changed = 1;
890 }
891 n = (i->max - min) % step;
892 if (n != 0 || i->openmax) {
893 i->max -= n;
894 changed = 1;
895 }
896 if (snd_interval_checkempty(i)) {
897 i->empty = 1;
898 return -EINVAL;
899 }
900 return changed;
901}
902
903/* Info constraints helpers */
904
905/**
906 * snd_pcm_hw_rule_add - add the hw-constraint rule
907 * @runtime: the pcm runtime instance
908 * @cond: condition bits
909 * @var: the variable to evaluate
910 * @func: the evaluation function
911 * @private: the private data pointer passed to function
912 * @dep: the dependent variables
913 *
914 * Returns zero if successful, or a negative error code on failure.
915 */
916int snd_pcm_hw_rule_add(snd_pcm_runtime_t *runtime, unsigned int cond,
917 int var,
918 snd_pcm_hw_rule_func_t func, void *private,
919 int dep, ...)
920{
921 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
922 snd_pcm_hw_rule_t *c;
923 unsigned int k;
924 va_list args;
925 va_start(args, dep);
926 if (constrs->rules_num >= constrs->rules_all) {
927 snd_pcm_hw_rule_t *new;
928 unsigned int new_rules = constrs->rules_all + 16;
929 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
930 if (!new)
931 return -ENOMEM;
932 if (constrs->rules) {
933 memcpy(new, constrs->rules,
934 constrs->rules_num * sizeof(*c));
935 kfree(constrs->rules);
936 }
937 constrs->rules = new;
938 constrs->rules_all = new_rules;
939 }
940 c = &constrs->rules[constrs->rules_num];
941 c->cond = cond;
942 c->func = func;
943 c->var = var;
944 c->private = private;
945 k = 0;
946 while (1) {
947 snd_assert(k < ARRAY_SIZE(c->deps), return -EINVAL);
948 c->deps[k++] = dep;
949 if (dep < 0)
950 break;
951 dep = va_arg(args, int);
952 }
953 constrs->rules_num++;
954 va_end(args);
955 return 0;
956}
957
958/**
959 * snd_pcm_hw_constraint_mask
df8db936
TI		 960 * @runtime: PCM runtime instance
961 * @var: hw_params variable to apply the mask
962 * @mask: the bitmap mask
963 *
964 * Apply the constraint of the given bitmap mask to a mask parameter.
1da177e4
LT		 965 */
966int snd_pcm_hw_constraint_mask(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
967 u_int32_t mask)
968{
969 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
970 snd_mask_t *maskp = constrs_mask(constrs, var);
971 *maskp->bits &= mask;
972 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
973 if (*maskp->bits == 0)
974 return -EINVAL;
975 return 0;
976}
977
978/**
979 * snd_pcm_hw_constraint_mask64
df8db936
TI		 980 * @runtime: PCM runtime instance
981 * @var: hw_params variable to apply the mask
982 * @mask: the 64bit bitmap mask
983 *
984 * Apply the constraint of the given bitmap mask to a mask parameter.
1da177e4
LT		 985 */
986int snd_pcm_hw_constraint_mask64(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
987 u_int64_t mask)
988{
989 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
990 snd_mask_t *maskp = constrs_mask(constrs, var);
991 maskp->bits[0] &= (u_int32_t)mask;
992 maskp->bits[1] &= (u_int32_t)(mask >> 32);
993 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
994 if (! maskp->bits[0] && ! maskp->bits[1])
995 return -EINVAL;
996 return 0;
997}
998
999/**
1000 * snd_pcm_hw_constraint_integer
df8db936
TI		 1001 * @runtime: PCM runtime instance
1002 * @var: hw_params variable to apply the integer constraint
1003 *
1004 * Apply the constraint of integer to an interval parameter.
1da177e4
LT		 1005 */
1006int snd_pcm_hw_constraint_integer(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var)
1007{
1008 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
1009 return snd_interval_setinteger(constrs_interval(constrs, var));
1010}
1011
1012/**
1013 * snd_pcm_hw_constraint_minmax
df8db936
TI		 1014 * @runtime: PCM runtime instance
1015 * @var: hw_params variable to apply the range
1016 * @min: the minimal value
1017 * @max: the maximal value
1018 *
1019 * Apply the min/max range constraint to an interval parameter.
1da177e4
LT		 1020 */
1021int snd_pcm_hw_constraint_minmax(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
1022 unsigned int min, unsigned int max)
1023{
1024 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
1025 snd_interval_t t;
1026 t.min = min;
1027 t.max = max;
1028 t.openmin = t.openmax = 0;
1029 t.integer = 0;
1030 return snd_interval_refine(constrs_interval(constrs, var), &t);
1031}
1032
1033static int snd_pcm_hw_rule_list(snd_pcm_hw_params_t *params,
1034 snd_pcm_hw_rule_t *rule)
1035{
1036 snd_pcm_hw_constraint_list_t *list = rule->private;
1037 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1038}
1039
1040
1041/**
1042 * snd_pcm_hw_constraint_list
df8db936
TI		 1043 * @runtime: PCM runtime instance
1044 * @cond: condition bits
1045 * @var: hw_params variable to apply the list constraint
1046 * @l: list
1047 *
1048 * Apply the list of constraints to an interval parameter.
1da177e4
LT		 1049 */
1050int snd_pcm_hw_constraint_list(snd_pcm_runtime_t *runtime,
1051 unsigned int cond,
1052 snd_pcm_hw_param_t var,
1053 snd_pcm_hw_constraint_list_t *l)
1054{
1055 return snd_pcm_hw_rule_add(runtime, cond, var,
1056 snd_pcm_hw_rule_list, l,
1057 var, -1);
1058}
1059
1060static int snd_pcm_hw_rule_ratnums(snd_pcm_hw_params_t *params,
1061 snd_pcm_hw_rule_t *rule)
1062{
1063 snd_pcm_hw_constraint_ratnums_t *r = rule->private;
1064 unsigned int num = 0, den = 0;
1065 int err;
1066 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1067 r->nrats, r->rats, &num, &den);
1068 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1069 params->rate_num = num;
1070 params->rate_den = den;
1071 }
1072 return err;
1073}
1074
1075/**
1076 * snd_pcm_hw_constraint_ratnums
df8db936
TI		 1077 * @runtime: PCM runtime instance
1078 * @cond: condition bits
1079 * @var: hw_params variable to apply the ratnums constraint
1080 * @r: ratnums_t constriants
1da177e4
LT		 1081 */
1082int snd_pcm_hw_constraint_ratnums(snd_pcm_runtime_t *runtime,
1083 unsigned int cond,
1084 snd_pcm_hw_param_t var,
1085 snd_pcm_hw_constraint_ratnums_t *r)
1086{
1087 return snd_pcm_hw_rule_add(runtime, cond, var,
1088 snd_pcm_hw_rule_ratnums, r,
1089 var, -1);
1090}
1091
1092static int snd_pcm_hw_rule_ratdens(snd_pcm_hw_params_t *params,
1093 snd_pcm_hw_rule_t *rule)
1094{
1095 snd_pcm_hw_constraint_ratdens_t *r = rule->private;
1096 unsigned int num = 0, den = 0;
1097 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1098 r->nrats, r->rats, &num, &den);
1099 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1100 params->rate_num = num;
1101 params->rate_den = den;
1102 }
1103 return err;
1104}
1105
1106/**
1107 * snd_pcm_hw_constraint_ratdens
df8db936
TI		 1108 * @runtime: PCM runtime instance
1109 * @cond: condition bits
1110 * @var: hw_params variable to apply the ratdens constraint
1111 * @r: ratdens_t constriants
1da177e4
LT		 1112 */
1113int snd_pcm_hw_constraint_ratdens(snd_pcm_runtime_t *runtime,
1114 unsigned int cond,
1115 snd_pcm_hw_param_t var,
1116 snd_pcm_hw_constraint_ratdens_t *r)
1117{
1118 return snd_pcm_hw_rule_add(runtime, cond, var,
1119 snd_pcm_hw_rule_ratdens, r,
1120 var, -1);
1121}
1122
1123static int snd_pcm_hw_rule_msbits(snd_pcm_hw_params_t *params,
1124 snd_pcm_hw_rule_t *rule)
1125{
1126 unsigned int l = (unsigned long) rule->private;
1127 int width = l & 0xffff;
1128 unsigned int msbits = l >> 16;
1129 snd_interval_t *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1130 if (snd_interval_single(i) && snd_interval_value(i) == width)
1131 params->msbits = msbits;
1132 return 0;
1133}
1134
1135/**
1136 * snd_pcm_hw_constraint_msbits
df8db936
TI		 1137 * @runtime: PCM runtime instance
1138 * @cond: condition bits
1139 * @width: sample bits width
1140 * @msbits: msbits width
1da177e4
LT		 1141 */
1142int snd_pcm_hw_constraint_msbits(snd_pcm_runtime_t *runtime,
1143 unsigned int cond,
1144 unsigned int width,
1145 unsigned int msbits)
1146{
1147 unsigned long l = (msbits << 16) | width;
1148 return snd_pcm_hw_rule_add(runtime, cond, -1,
1149 snd_pcm_hw_rule_msbits,
1150 (void*) l,
1151 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1152}
1153
1154static int snd_pcm_hw_rule_step(snd_pcm_hw_params_t *params,
1155 snd_pcm_hw_rule_t *rule)
1156{
1157 unsigned long step = (unsigned long) rule->private;
1158 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1159}
1160
1161/**
1162 * snd_pcm_hw_constraint_step
df8db936
TI		 1163 * @runtime: PCM runtime instance
1164 * @cond: condition bits
1165 * @var: hw_params variable to apply the step constraint
1166 * @step: step size
1da177e4
LT		 1167 */
1168int snd_pcm_hw_constraint_step(snd_pcm_runtime_t *runtime,
1169 unsigned int cond,
1170 snd_pcm_hw_param_t var,
1171 unsigned long step)
1172{
1173 return snd_pcm_hw_rule_add(runtime, cond, var,
1174 snd_pcm_hw_rule_step, (void *) step,
1175 var, -1);
1176}
1177
1178static int snd_pcm_hw_rule_pow2(snd_pcm_hw_params_t *params, snd_pcm_hw_rule_t *rule)
1179{
1180 static int pow2_sizes[] = {
1181 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1182 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1183 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1184 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1185 };
1186 return snd_interval_list(hw_param_interval(params, rule->var),
1187 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1188}
1189
1190/**
1191 * snd_pcm_hw_constraint_pow2
df8db936
TI		 1192 * @runtime: PCM runtime instance
1193 * @cond: condition bits
1194 * @var: hw_params variable to apply the power-of-2 constraint
1da177e4
LT		 1195 */
1196int snd_pcm_hw_constraint_pow2(snd_pcm_runtime_t *runtime,
1197 unsigned int cond,
1198 snd_pcm_hw_param_t var)
1199{
1200 return snd_pcm_hw_rule_add(runtime, cond, var,
1201 snd_pcm_hw_rule_pow2, NULL,
1202 var, -1);
1203}
1204
1205/* To use the same code we have in alsa-lib */
1206#define snd_pcm_t snd_pcm_substream_t
1207#define assert(i) snd_assert((i), return -EINVAL)
1208#ifndef INT_MIN
1209#define INT_MIN ((int)((unsigned int)INT_MAX+1))
1210#endif
1211
123992f7
AB		 1212static void _snd_pcm_hw_param_any(snd_pcm_hw_params_t *params,
1213 snd_pcm_hw_param_t var)
1da177e4
LT		 1214{
1215 if (hw_is_mask(var)) {
1216 snd_mask_any(hw_param_mask(params, var));
1217 params->cmask |= 1 << var;
1218 params->rmask |= 1 << var;
1219 return;
1220 }
1221 if (hw_is_interval(var)) {
1222 snd_interval_any(hw_param_interval(params, var));
1223 params->cmask |= 1 << var;
1224 params->rmask |= 1 << var;
1225 return;
1226 }
1227 snd_BUG();
1228}
1229
62144100 1230#if 0
df8db936 1231/*
1da177e4
LT		 1232 * snd_pcm_hw_param_any
1233 */
1234int snd_pcm_hw_param_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1235 snd_pcm_hw_param_t var)
1236{
1237 _snd_pcm_hw_param_any(params, var);
1238 return snd_pcm_hw_refine(pcm, params);
1239}
123992f7 1240#endif /* 0 */
1da177e4
LT		 1241
1242void _snd_pcm_hw_params_any(snd_pcm_hw_params_t *params)
1243{
1244 unsigned int k;
1245 memset(params, 0, sizeof(*params));
1246 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1247 _snd_pcm_hw_param_any(params, k);
1248 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1249 _snd_pcm_hw_param_any(params, k);
1250 params->info = ~0U;
1251}
1252
62144100 1253#if 0
df8db936 1254/*
1da177e4
LT		 1255 * snd_pcm_hw_params_any
1256 *
1257 * Fill PARAMS with full configuration space boundaries
1258 */
1259int snd_pcm_hw_params_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
1260{
1261 _snd_pcm_hw_params_any(params);
1262 return snd_pcm_hw_refine(pcm, params);
1263}
123992f7 1264#endif /* 0 */
1da177e4
LT		 1265
1266/**
1267 * snd_pcm_hw_param_value
df8db936
TI		 1268 * @params: the hw_params instance
1269 * @var: parameter to retrieve
1270 * @dir: pointer to the direction (-1,0,1) or NULL
1da177e4
LT		 1271 *
1272 * Return the value for field PAR if it's fixed in configuration space
1273 * defined by PARAMS. Return -EINVAL otherwise
1274 */
123992f7
AB		 1275static int snd_pcm_hw_param_value(const snd_pcm_hw_params_t *params,
1276 snd_pcm_hw_param_t var, int *dir)
1da177e4
LT		 1277{
1278 if (hw_is_mask(var)) {
1279 const snd_mask_t *mask = hw_param_mask_c(params, var);
1280 if (!snd_mask_single(mask))
1281 return -EINVAL;
1282 if (dir)
1283 *dir = 0;
1284 return snd_mask_value(mask);
1285 }
1286 if (hw_is_interval(var)) {
1287 const snd_interval_t *i = hw_param_interval_c(params, var);
1288 if (!snd_interval_single(i))
1289 return -EINVAL;
1290 if (dir)
1291 *dir = i->openmin;
1292 return snd_interval_value(i);
1293 }
1294 assert(0);
1295 return -EINVAL;
1296}
1297
1298/**
1299 * snd_pcm_hw_param_value_min
df8db936
TI		 1300 * @params: the hw_params instance
1301 * @var: parameter to retrieve
1302 * @dir: pointer to the direction (-1,0,1) or NULL
1da177e4
LT		 1303 *
1304 * Return the minimum value for field PAR.
1305 */
1306unsigned int snd_pcm_hw_param_value_min(const snd_pcm_hw_params_t *params,
1307 snd_pcm_hw_param_t var, int *dir)
1308{
1309 if (hw_is_mask(var)) {
1310 if (dir)
1311 *dir = 0;
1312 return snd_mask_min(hw_param_mask_c(params, var));
1313 }
1314 if (hw_is_interval(var)) {
1315 const snd_interval_t *i = hw_param_interval_c(params, var);
1316 if (dir)
1317 *dir = i->openmin;
1318 return snd_interval_min(i);
1319 }
1320 assert(0);
1321 return -EINVAL;
1322}
1323
1324/**
1325 * snd_pcm_hw_param_value_max
df8db936
TI		 1326 * @params: the hw_params instance
1327 * @var: parameter to retrieve
1328 * @dir: pointer to the direction (-1,0,1) or NULL
1da177e4
LT		 1329 *
1330 * Return the maximum value for field PAR.
1331 */
1332unsigned int snd_pcm_hw_param_value_max(const snd_pcm_hw_params_t *params,
1333 snd_pcm_hw_param_t var, int *dir)
1334{
1335 if (hw_is_mask(var)) {
1336 if (dir)
1337 *dir = 0;
1338 return snd_mask_max(hw_param_mask_c(params, var));
1339 }
1340 if (hw_is_interval(var)) {
1341 const snd_interval_t *i = hw_param_interval_c(params, var);
1342 if (dir)
1343 *dir = - (int) i->openmax;
1344 return snd_interval_max(i);
1345 }
1346 assert(0);
1347 return -EINVAL;
1348}
1349
1350void _snd_pcm_hw_param_setempty(snd_pcm_hw_params_t *params,
1351 snd_pcm_hw_param_t var)
1352{
1353 if (hw_is_mask(var)) {
1354 snd_mask_none(hw_param_mask(params, var));
1355 params->cmask |= 1 << var;
1356 params->rmask |= 1 << var;
1357 } else if (hw_is_interval(var)) {
1358 snd_interval_none(hw_param_interval(params, var));
1359 params->cmask |= 1 << var;
1360 params->rmask |= 1 << var;
1361 } else {
1362 snd_BUG();
1363 }
1364}
1365
1366int _snd_pcm_hw_param_setinteger(snd_pcm_hw_params_t *params,
1367 snd_pcm_hw_param_t var)
1368{
1369 int changed;
1370 assert(hw_is_interval(var));
1371 changed = snd_interval_setinteger(hw_param_interval(params, var));
1372 if (changed) {
1373 params->cmask |= 1 << var;
1374 params->rmask |= 1 << var;
1375 }
1376 return changed;
1377}
1378
62144100 1379#if 0
df8db936 1380/*
1da177e4
LT		 1381 * snd_pcm_hw_param_setinteger
1382 *
1383 * Inside configuration space defined by PARAMS remove from PAR all
1384 * non integer values. Reduce configuration space accordingly.
1385 * Return -EINVAL if the configuration space is empty
1386 */
1387int snd_pcm_hw_param_setinteger(snd_pcm_t *pcm,
1388 snd_pcm_hw_params_t *params,
1389 snd_pcm_hw_param_t var)
1390{
1391 int changed = _snd_pcm_hw_param_setinteger(params, var);
1392 if (changed < 0)
1393 return changed;
1394 if (params->rmask) {
1395 int err = snd_pcm_hw_refine(pcm, params);
1396 if (err < 0)
1397 return err;
1398 }
1399 return 0;
1400}
123992f7 1401#endif /* 0 */
1da177e4 1402
123992f7
AB		 1403static int _snd_pcm_hw_param_first(snd_pcm_hw_params_t *params,
1404 snd_pcm_hw_param_t var)
1da177e4
LT		 1405{
1406 int changed;
1407 if (hw_is_mask(var))
1408 changed = snd_mask_refine_first(hw_param_mask(params, var));
1409 else if (hw_is_interval(var))
1410 changed = snd_interval_refine_first(hw_param_interval(params, var));
1411 else {
1412 assert(0);
1413 return -EINVAL;
1414 }
1415 if (changed) {
1416 params->cmask |= 1 << var;
1417 params->rmask |= 1 << var;
1418 }
1419 return changed;
1420}
1421
1422
1423/**
1424 * snd_pcm_hw_param_first
df8db936
TI		 1425 * @pcm: PCM instance
1426 * @params: the hw_params instance
1427 * @var: parameter to retrieve
1428 * @dir: pointer to the direction (-1,0,1) or NULL
1da177e4
LT		 1429 *
1430 * Inside configuration space defined by PARAMS remove from PAR all
1431 * values > minimum. Reduce configuration space accordingly.
1432 * Return the minimum.
1433 */
123992f7
AB		 1434static int snd_pcm_hw_param_first(snd_pcm_t *pcm,
1435 snd_pcm_hw_params_t *params,
1436 snd_pcm_hw_param_t var, int *dir)
1da177e4
LT		 1437{
1438 int changed = _snd_pcm_hw_param_first(params, var);
1439 if (changed < 0)
1440 return changed;
1441 if (params->rmask) {
1442 int err = snd_pcm_hw_refine(pcm, params);
1443 assert(err >= 0);
1444 }
1445 return snd_pcm_hw_param_value(params, var, dir);
1446}
1447
123992f7
AB		 1448static int _snd_pcm_hw_param_last(snd_pcm_hw_params_t *params,
1449 snd_pcm_hw_param_t var)
1da177e4
LT		 1450{
1451 int changed;
1452 if (hw_is_mask(var))
1453 changed = snd_mask_refine_last(hw_param_mask(params, var));
1454 else if (hw_is_interval(var))
1455 changed = snd_interval_refine_last(hw_param_interval(params, var));
1456 else {
1457 assert(0);
1458 return -EINVAL;
1459 }
1460 if (changed) {
1461 params->cmask |= 1 << var;
1462 params->rmask |= 1 << var;
1463 }
1464 return changed;
1465}
1466
1467
1468/**
1469 * snd_pcm_hw_param_last
df8db936
TI		 1470 * @pcm: PCM instance
1471 * @params: the hw_params instance
1472 * @var: parameter to retrieve
1473 * @dir: pointer to the direction (-1,0,1) or NULL
1da177e4
LT		 1474 *
1475 * Inside configuration space defined by PARAMS remove from PAR all
1476 * values < maximum. Reduce configuration space accordingly.
1477 * Return the maximum.
1478 */
123992f7
AB		 1479static int snd_pcm_hw_param_last(snd_pcm_t *pcm,
1480 snd_pcm_hw_params_t *params,
1481 snd_pcm_hw_param_t var, int *dir)
1da177e4
LT		 1482{
1483 int changed = _snd_pcm_hw_param_last(params, var);
1484 if (changed < 0)
1485 return changed;
1486 if (params->rmask) {
1487 int err = snd_pcm_hw_refine(pcm, params);
1488 assert(err >= 0);
1489 }
1490 return snd_pcm_hw_param_value(params, var, dir);
1491}
1492
1493int _snd_pcm_hw_param_min(snd_pcm_hw_params_t *params,
1494 snd_pcm_hw_param_t var, unsigned int val, int dir)
1495{
1496 int changed;
1497 int open = 0;
1498 if (dir) {
1499 if (dir > 0) {
1500 open = 1;
1501 } else if (dir < 0) {
1502 if (val > 0) {
1503 open = 1;
1504 val--;
1505 }
1506 }
1507 }
1508 if (hw_is_mask(var))
1509 changed = snd_mask_refine_min(hw_param_mask(params, var), val + !!open);
1510 else if (hw_is_interval(var))
1511 changed = snd_interval_refine_min(hw_param_interval(params, var), val, open);
1512 else {
1513 assert(0);
1514 return -EINVAL;
1515 }
1516 if (changed) {
1517 params->cmask |= 1 << var;
1518 params->rmask |= 1 << var;
1519 }
1520 return changed;
1521}
1522
1523/**
1524 * snd_pcm_hw_param_min
df8db936
TI		 1525 * @pcm: PCM instance
1526 * @params: the hw_params instance
1527 * @var: parameter to retrieve
1528 * @val: minimal value
1529 * @dir: pointer to the direction (-1,0,1) or NULL
1da177e4
LT		 1530 *
1531 * Inside configuration space defined by PARAMS remove from PAR all
1532 * values < VAL. Reduce configuration space accordingly.
1533 * Return new minimum or -EINVAL if the configuration space is empty
1534 */
123992f7
AB		 1535static int snd_pcm_hw_param_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1536 snd_pcm_hw_param_t var, unsigned int val,
1537 int *dir)
1da177e4
LT		 1538{
1539 int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
1540 if (changed < 0)
1541 return changed;
1542 if (params->rmask) {
1543 int err = snd_pcm_hw_refine(pcm, params);
1544 if (err < 0)
1545 return err;
1546 }
1547 return snd_pcm_hw_param_value_min(params, var, dir);
1548}
1549
123992f7
AB		 1550static int _snd_pcm_hw_param_max(snd_pcm_hw_params_t *params,
1551 snd_pcm_hw_param_t var, unsigned int val,
1552 int dir)
1da177e4
LT		 1553{
1554 int changed;
1555 int open = 0;
1556 if (dir) {
1557 if (dir < 0) {
1558 open = 1;
1559 } else if (dir > 0) {
1560 open = 1;
1561 val++;
1562 }
1563 }
1564 if (hw_is_mask(var)) {
1565 if (val == 0 && open) {
1566 snd_mask_none(hw_param_mask(params, var));
1567 changed = -EINVAL;
1568 } else
1569 changed = snd_mask_refine_max(hw_param_mask(params, var), val - !!open);
1570 } else if (hw_is_interval(var))
1571 changed = snd_interval_refine_max(hw_param_interval(params, var), val, open);
1572 else {
1573 assert(0);
1574 return -EINVAL;
1575 }
1576 if (changed) {
1577 params->cmask |= 1 << var;
1578 params->rmask |= 1 << var;
1579 }
1580 return changed;
1581}
1582
1583/**
1584 * snd_pcm_hw_param_max
df8db936
TI		 1585 * @pcm: PCM instance
1586 * @params: the hw_params instance
1587 * @var: parameter to retrieve
1588 * @val: maximal value
1589 * @dir: pointer to the direction (-1,0,1) or NULL
1da177e4
LT		 1590 *
1591 * Inside configuration space defined by PARAMS remove from PAR all
1592 * values >= VAL + 1. Reduce configuration space accordingly.
1593 * Return new maximum or -EINVAL if the configuration space is empty
1594 */
123992f7
AB		 1595static int snd_pcm_hw_param_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1596 snd_pcm_hw_param_t var, unsigned int val,
1597 int *dir)
1da177e4
LT		 1598{
1599 int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
1600 if (changed < 0)
1601 return changed;
1602 if (params->rmask) {
1603 int err = snd_pcm_hw_refine(pcm, params);
1604 if (err < 0)
1605 return err;
1606 }
1607 return snd_pcm_hw_param_value_max(params, var, dir);
1608}
1609
1610int _snd_pcm_hw_param_set(snd_pcm_hw_params_t *params,
1611 snd_pcm_hw_param_t var, unsigned int val, int dir)
1612{
1613 int changed;
1614 if (hw_is_mask(var)) {
1615 snd_mask_t *m = hw_param_mask(params, var);
1616 if (val == 0 && dir < 0) {
1617 changed = -EINVAL;
1618 snd_mask_none(m);
1619 } else {
1620 if (dir > 0)
1621 val++;
1622 else if (dir < 0)
1623 val--;
1624 changed = snd_mask_refine_set(hw_param_mask(params, var), val);
1625 }
1626 } else if (hw_is_interval(var)) {
1627 snd_interval_t *i = hw_param_interval(params, var);
1628 if (val == 0 && dir < 0) {
1629 changed = -EINVAL;
1630 snd_interval_none(i);
1631 } else if (dir == 0)
1632 changed = snd_interval_refine_set(i, val);
1633 else {
1634 snd_interval_t t;
1635 t.openmin = 1;
1636 t.openmax = 1;
1637 t.empty = 0;
1638 t.integer = 0;
1639 if (dir < 0) {
1640 t.min = val - 1;
1641 t.max = val;
1642 } else {
1643 t.min = val;
1644 t.max = val+1;
1645 }
1646 changed = snd_interval_refine(i, &t);
1647 }
1648 } else {
1649 assert(0);
1650 return -EINVAL;
1651 }
1652 if (changed) {
1653 params->cmask |= 1 << var;
1654 params->rmask |= 1 << var;
1655 }
1656 return changed;
1657}
1658
1659/**
1660 * snd_pcm_hw_param_set
df8db936
TI		 1661 * @pcm: PCM instance
1662 * @params: the hw_params instance
1663 * @var: parameter to retrieve
1664 * @val: value to set
1665 * @dir: pointer to the direction (-1,0,1) or NULL
1da177e4
LT		 1666 *
1667 * Inside configuration space defined by PARAMS remove from PAR all
1668 * values != VAL. Reduce configuration space accordingly.
1669 * Return VAL or -EINVAL if the configuration space is empty
1670 */
1671int snd_pcm_hw_param_set(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1672 snd_pcm_hw_param_t var, unsigned int val, int dir)
1673{
1674 int changed = _snd_pcm_hw_param_set(params, var, val, dir);
1675 if (changed < 0)
1676 return changed;
1677 if (params->rmask) {
1678 int err = snd_pcm_hw_refine(pcm, params);
1679 if (err < 0)
1680 return err;
1681 }
1682 return snd_pcm_hw_param_value(params, var, NULL);
1683}
1684
a53fc188
CL		 1685static int _snd_pcm_hw_param_mask(snd_pcm_hw_params_t *params,
1686 snd_pcm_hw_param_t var, const snd_mask_t *val)
1da177e4
LT		 1687{
1688 int changed;
1689 assert(hw_is_mask(var));
1690 changed = snd_mask_refine(hw_param_mask(params, var), val);
1691 if (changed) {
1692 params->cmask |= 1 << var;
1693 params->rmask |= 1 << var;
1694 }
1695 return changed;
1696}
1697
1698/**
1699 * snd_pcm_hw_param_mask
df8db936
TI		 1700 * @pcm: PCM instance
1701 * @params: the hw_params instance
1702 * @var: parameter to retrieve
1703 * @val: mask to apply
1da177e4
LT		 1704 *
1705 * Inside configuration space defined by PARAMS remove from PAR all values
1706 * not contained in MASK. Reduce configuration space accordingly.
1707 * This function can be called only for SNDRV_PCM_HW_PARAM_ACCESS,
1708 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1709 * Return 0 on success or -EINVAL
1710 * if the configuration space is empty
1711 */
1712int snd_pcm_hw_param_mask(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1713 snd_pcm_hw_param_t var, const snd_mask_t *val)
1714{
1715 int changed = _snd_pcm_hw_param_mask(params, var, val);
1716 if (changed < 0)
1717 return changed;
1718 if (params->rmask) {
1719 int err = snd_pcm_hw_refine(pcm, params);
1720 if (err < 0)
1721 return err;
1722 }
1723 return 0;
1724}
1725
1726static int boundary_sub(int a, int adir,
1727 int b, int bdir,
1728 int *c, int *cdir)
1729{
1730 adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
1731 bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
1732 *c = a - b;
1733 *cdir = adir - bdir;
1734 if (*cdir == -2) {
1735 assert(*c > INT_MIN);
1736 (*c)--;
1737 } else if (*cdir == 2) {
1738 assert(*c < INT_MAX);
1739 (*c)++;
1740 }
1741 return 0;
1742}
1743
1744static int boundary_lt(unsigned int a, int adir,
1745 unsigned int b, int bdir)
1746{
1747 assert(a > 0 || adir >= 0);
1748 assert(b > 0 || bdir >= 0);
1749 if (adir < 0) {
1750 a--;
1751 adir = 1;
1752 } else if (adir > 0)
1753 adir = 1;
1754 if (bdir < 0) {
1755 b--;
1756 bdir = 1;
1757 } else if (bdir > 0)
1758 bdir = 1;
1759 return a < b || (a == b && adir < bdir);
1760}
1761
1762/* Return 1 if min is nearer to best than max */
1763static int boundary_nearer(int min, int mindir,
1764 int best, int bestdir,
1765 int max, int maxdir)
1766{
1767 int dmin, dmindir;
1768 int dmax, dmaxdir;
1769 boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
1770 boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
1771 return boundary_lt(dmin, dmindir, dmax, dmaxdir);
1772}
1773
1774/**
1775 * snd_pcm_hw_param_near
df8db936
TI		 1776 * @pcm: PCM instance
1777 * @params: the hw_params instance
1778 * @var: parameter to retrieve
1779 * @best: value to set
1780 * @dir: pointer to the direction (-1,0,1) or NULL
1da177e4
LT		 1781 *
1782 * Inside configuration space defined by PARAMS set PAR to the available value
1783 * nearest to VAL. Reduce configuration space accordingly.
1784 * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
1785 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1786 * Return the value found.
1787 */
1788int snd_pcm_hw_param_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1789 snd_pcm_hw_param_t var, unsigned int best, int *dir)
1790{
1791 snd_pcm_hw_params_t *save = NULL;
1792 int v;
1793 unsigned int saved_min;
1794 int last = 0;
1795 int min, max;
1796 int mindir, maxdir;
1797 int valdir = dir ? *dir : 0;
1798 /* FIXME */
1799 if (best > INT_MAX)
1800 best = INT_MAX;
1801 min = max = best;
1802 mindir = maxdir = valdir;
1803 if (maxdir > 0)
1804 maxdir = 0;
1805 else if (maxdir == 0)
1806 maxdir = -1;
1807 else {
1808 maxdir = 1;
1809 max--;
1810 }
1811 save = kmalloc(sizeof(*save), GFP_KERNEL);
1812 if (save == NULL)
1813 return -ENOMEM;
1814 *save = *params;
1815 saved_min = min;
1816 min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
1817 if (min >= 0) {
1818 snd_pcm_hw_params_t *params1;
1819 if (max < 0)
1820 goto _end;
1821 if ((unsigned int)min == saved_min && mindir == valdir)
1822 goto _end;
1823 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
1824 if (params1 == NULL) {
1825 kfree(save);
1826 return -ENOMEM;
1827 }
1828 *params1 = *save;
1829 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
1830 if (max < 0) {
1831 kfree(params1);
1832 goto _end;
1833 }
1834 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
1835 *params = *params1;
1836 last = 1;
1837 }
1838 kfree(params1);
1839 } else {
1840 *params = *save;
1841 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
1842 assert(max >= 0);
1843 last = 1;
1844 }
1845 _end:
1846 kfree(save);
1847 if (last)
1848 v = snd_pcm_hw_param_last(pcm, params, var, dir);
1849 else
1850 v = snd_pcm_hw_param_first(pcm, params, var, dir);
1851 assert(v >= 0);
1852 return v;
1853}
1854
1855/**
1856 * snd_pcm_hw_param_choose
df8db936
TI		 1857 * @pcm: PCM instance
1858 * @params: the hw_params instance
1da177e4
LT		 1859 *
1860 * Choose one configuration from configuration space defined by PARAMS
1861 * The configuration chosen is that obtained fixing in this order:
1862 * first access, first format, first subformat, min channels,
1863 * min rate, min period time, max buffer size, min tick time
1864 */
1865int snd_pcm_hw_params_choose(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
1866{
1867 int err;
1868
1869 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_ACCESS, NULL);
1870 assert(err >= 0);
1871
1872 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_FORMAT, NULL);
1873 assert(err >= 0);
1874
1875 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_SUBFORMAT, NULL);
1876 assert(err >= 0);
1877
1878 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_CHANNELS, NULL);
1879 assert(err >= 0);
1880
1881 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_RATE, NULL);
1882 assert(err >= 0);
1883
1884 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_PERIOD_TIME, NULL);
1885 assert(err >= 0);
1886
1887 err = snd_pcm_hw_param_last(pcm, params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL);
1888 assert(err >= 0);
1889
1890 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_TICK_TIME, NULL);
1891 assert(err >= 0);
1892
1893 return 0;
1894}
1895
1896#undef snd_pcm_t
1897#undef assert
1898
1899static int snd_pcm_lib_ioctl_reset(snd_pcm_substream_t *substream,
1900 void *arg)
1901{
1902 snd_pcm_runtime_t *runtime = substream->runtime;
1903 unsigned long flags;
1904 snd_pcm_stream_lock_irqsave(substream, flags);
1905 if (snd_pcm_running(substream) &&
1906 snd_pcm_update_hw_ptr(substream) >= 0)
1907 runtime->status->hw_ptr %= runtime->buffer_size;
1908 else
1909 runtime->status->hw_ptr = 0;
1910 snd_pcm_stream_unlock_irqrestore(substream, flags);
1911 return 0;
1912}
1913
1914static int snd_pcm_lib_ioctl_channel_info(snd_pcm_substream_t *substream,
1915 void *arg)
1916{
1917 snd_pcm_channel_info_t *info = arg;
1918 snd_pcm_runtime_t *runtime = substream->runtime;
1919 int width;
1920 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1921 info->offset = -1;
1922 return 0;
1923 }
1924 width = snd_pcm_format_physical_width(runtime->format);
1925 if (width < 0)
1926 return width;
1927 info->offset = 0;
1928 switch (runtime->access) {
1929 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1930 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1931 info->first = info->channel * width;
1932 info->step = runtime->channels * width;
1933 break;
1934 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1935 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1936 {
1937 size_t size = runtime->dma_bytes / runtime->channels;
1938 info->first = info->channel * size * 8;
1939 info->step = width;
1940 break;
1941 }
1942 default:
1943 snd_BUG();
1944 break;
1945 }
1946 return 0;
1947}
1948
1949/**
1950 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1951 * @substream: the pcm substream instance
1952 * @cmd: ioctl command
1953 * @arg: ioctl argument
1954 *
1955 * Processes the generic ioctl commands for PCM.
1956 * Can be passed as the ioctl callback for PCM ops.
1957 *
1958 * Returns zero if successful, or a negative error code on failure.
1959 */
1960int snd_pcm_lib_ioctl(snd_pcm_substream_t *substream,
1961 unsigned int cmd, void *arg)
1962{
1963 switch (cmd) {
1964 case SNDRV_PCM_IOCTL1_INFO:
1965 return 0;
1966 case SNDRV_PCM_IOCTL1_RESET:
1967 return snd_pcm_lib_ioctl_reset(substream, arg);
1968 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1969 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1970 }
1971 return -ENXIO;
1972}
1973
1974/*
1975 * Conditions
1976 */
1977
1978static void snd_pcm_system_tick_set(snd_pcm_substream_t *substream,
1979 unsigned long ticks)
1980{
1981 snd_pcm_runtime_t *runtime = substream->runtime;
1982 if (ticks == 0)
1983 del_timer(&runtime->tick_timer);
1984 else {
1985 ticks += (1000000 / HZ) - 1;
1986 ticks /= (1000000 / HZ);
1987 mod_timer(&runtime->tick_timer, jiffies + ticks);
1988 }
1989}
1990
1991/* Temporary alias */
1992void snd_pcm_tick_set(snd_pcm_substream_t *substream, unsigned long ticks)
1993{
1994 snd_pcm_system_tick_set(substream, ticks);
1995}
1996
1997void snd_pcm_tick_prepare(snd_pcm_substream_t *substream)
1998{
1999 snd_pcm_runtime_t *runtime = substream->runtime;
2000 snd_pcm_uframes_t frames = ULONG_MAX;
2001 snd_pcm_uframes_t avail, dist;
2002 unsigned int ticks;
2003 u_int64_t n;
2004 u_int32_t r;
2005 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2006 if (runtime->silence_size >= runtime->boundary) {
2007 frames = 1;
2008 } else if (runtime->silence_size > 0 &&
2009 runtime->silence_filled < runtime->buffer_size) {
2010 snd_pcm_sframes_t noise_dist;
2011 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
2012 snd_assert(noise_dist <= (snd_pcm_sframes_t)runtime->silence_threshold, );
2013 frames = noise_dist - runtime->silence_threshold;
2014 }
2015 avail = snd_pcm_playback_avail(runtime);
2016 } else {
2017 avail = snd_pcm_capture_avail(runtime);
2018 }
2019 if (avail < runtime->control->avail_min) {
2020 snd_pcm_sframes_t n = runtime->control->avail_min - avail;
2021 if (n > 0 && frames > (snd_pcm_uframes_t)n)
2022 frames = n;
2023 }
2024 if (avail < runtime->buffer_size) {
2025 snd_pcm_sframes_t n = runtime->buffer_size - avail;
2026 if (n > 0 && frames > (snd_pcm_uframes_t)n)
2027 frames = n;
2028 }
2029 if (frames == ULONG_MAX) {
2030 snd_pcm_tick_set(substream, 0);
2031 return;
2032 }
2033 dist = runtime->status->hw_ptr - runtime->hw_ptr_base;
2034 /* Distance to next interrupt */
2035 dist = runtime->period_size - dist % runtime->period_size;
2036 if (dist <= frames) {
2037 snd_pcm_tick_set(substream, 0);
2038 return;
2039 }
2040 /* the base time is us */
2041 n = frames;
2042 n *= 1000000;
2043 div64_32(&n, runtime->tick_time * runtime->rate, &r);
2044 ticks = n + (r > 0 ? 1 : 0);
2045 if (ticks < runtime->sleep_min)
2046 ticks = runtime->sleep_min;
2047 snd_pcm_tick_set(substream, (unsigned long) ticks);
2048}
2049
2050void snd_pcm_tick_elapsed(snd_pcm_substream_t *substream)
2051{
2052 snd_pcm_runtime_t *runtime;
2053 unsigned long flags;
2054
2055 snd_assert(substream != NULL, return);
2056 runtime = substream->runtime;
2057 snd_assert(runtime != NULL, return);
2058
2059 snd_pcm_stream_lock_irqsave(substream, flags);
2060 if (!snd_pcm_running(substream) ||
2061 snd_pcm_update_hw_ptr(substream) < 0)
2062 goto _end;
2063 if (runtime->sleep_min)
2064 snd_pcm_tick_prepare(substream);
2065 _end:
2066 snd_pcm_stream_unlock_irqrestore(substream, flags);
2067}
2068
2069/**
2070 * snd_pcm_period_elapsed - update the pcm status for the next period
2071 * @substream: the pcm substream instance
2072 *
2073 * This function is called from the interrupt handler when the
2074 * PCM has processed the period size. It will update the current
2075 * pointer, set up the tick, wake up sleepers, etc.
2076 *
2077 * Even if more than one periods have elapsed since the last call, you
2078 * have to call this only once.
2079 */
2080void snd_pcm_period_elapsed(snd_pcm_substream_t *substream)
2081{
2082 snd_pcm_runtime_t *runtime;
2083 unsigned long flags;
2084
2085 snd_assert(substream != NULL, return);
2086 runtime = substream->runtime;
2087 snd_assert(runtime != NULL, return);
2088
2089 if (runtime->transfer_ack_begin)
2090 runtime->transfer_ack_begin(substream);
2091
2092 snd_pcm_stream_lock_irqsave(substream, flags);
2093 if (!snd_pcm_running(substream) ||
2094 snd_pcm_update_hw_ptr_interrupt(substream) < 0)
2095 goto _end;
2096
2097 if (substream->timer_running)
2098 snd_timer_interrupt(substream->timer, 1);
2099 if (runtime->sleep_min)
2100 snd_pcm_tick_prepare(substream);
2101 _end:
2102 snd_pcm_stream_unlock_irqrestore(substream, flags);
2103 if (runtime->transfer_ack_end)
2104 runtime->transfer_ack_end(substream);
2105 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
2106}
2107
2108static int snd_pcm_lib_write_transfer(snd_pcm_substream_t *substream,
2109 unsigned int hwoff,
2110 unsigned long data, unsigned int off,
2111 snd_pcm_uframes_t frames)
2112{
2113 snd_pcm_runtime_t *runtime = substream->runtime;
2114 int err;
2115 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2116 if (substream->ops->copy) {
2117 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2118 return err;
2119 } else {
2120 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2121 snd_assert(runtime->dma_area, return -EFAULT);
2122 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
2123 return -EFAULT;
2124 }
2125 return 0;
2126}
2127
2128typedef int (*transfer_f)(snd_pcm_substream_t *substream, unsigned int hwoff,
2129 unsigned long data, unsigned int off,
2130 snd_pcm_uframes_t size);
2131
2132static snd_pcm_sframes_t snd_pcm_lib_write1(snd_pcm_substream_t *substream,
2133 unsigned long data,
2134 snd_pcm_uframes_t size,
2135 int nonblock,
2136 transfer_f transfer)
2137{
2138 snd_pcm_runtime_t *runtime = substream->runtime;
2139 snd_pcm_uframes_t xfer = 0;
2140 snd_pcm_uframes_t offset = 0;
2141 int err = 0;
2142
2143 if (size == 0)
2144 return 0;
2145 if (size > runtime->xfer_align)
2146 size -= size % runtime->xfer_align;
2147
2148 snd_pcm_stream_lock_irq(substream);
2149 switch (runtime->status->state) {
2150 case SNDRV_PCM_STATE_PREPARED:
2151 case SNDRV_PCM_STATE_RUNNING:
2152 case SNDRV_PCM_STATE_PAUSED:
2153 break;
2154 case SNDRV_PCM_STATE_XRUN:
2155 err = -EPIPE;
2156 goto _end_unlock;
2157 case SNDRV_PCM_STATE_SUSPENDED:
2158 err = -ESTRPIPE;
2159 goto _end_unlock;
2160 default:
2161 err = -EBADFD;
2162 goto _end_unlock;
2163 }
2164
2165 while (size > 0) {
2166 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2167 snd_pcm_uframes_t avail;
2168 snd_pcm_uframes_t cont;
2169 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2170 snd_pcm_update_hw_ptr(substream);
2171 avail = snd_pcm_playback_avail(runtime);
2172 if (((avail < runtime->control->avail_min && size > avail) ||
2173 (size >= runtime->xfer_align && avail < runtime->xfer_align))) {
2174 wait_queue_t wait;
443feb88 2175 enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
1da177e4
LT		 2176 long tout;
2177
2178 if (nonblock) {
2179 err = -EAGAIN;
2180 goto _end_unlock;
2181 }
2182
2183 init_waitqueue_entry(&wait, current);
2184 add_wait_queue(&runtime->sleep, &wait);
2185 while (1) {
2186 if (signal_pending(current)) {
2187 state = SIGNALED;
2188 break;
2189 }
2190 set_current_state(TASK_INTERRUPTIBLE);
2191 snd_pcm_stream_unlock_irq(substream);
2192 tout = schedule_timeout(10 * HZ);
2193 snd_pcm_stream_lock_irq(substream);
2194 if (tout == 0) {
2195 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2196 runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2197 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2198 break;
2199 }
2200 }
2201 switch (runtime->status->state) {
2202 case SNDRV_PCM_STATE_XRUN:
2203 case SNDRV_PCM_STATE_DRAINING:
2204 state = ERROR;
2205 goto _end_loop;
2206 case SNDRV_PCM_STATE_SUSPENDED:
2207 state = SUSPENDED;
2208 goto _end_loop;
443feb88
KW		 2209 case SNDRV_PCM_STATE_SETUP:
2210 state = DROPPED;
2211 goto _end_loop;
1da177e4
LT		 2212 default:
2213 break;
2214 }
2215 avail = snd_pcm_playback_avail(runtime);
2216 if (avail >= runtime->control->avail_min) {
2217 state = READY;
2218 break;
2219 }
2220 }
2221 _end_loop:
2222 remove_wait_queue(&runtime->sleep, &wait);
2223
2224 switch (state) {
2225 case ERROR:
2226 err = -EPIPE;
2227 goto _end_unlock;
2228 case SUSPENDED:
2229 err = -ESTRPIPE;
2230 goto _end_unlock;
2231 case SIGNALED:
2232 err = -ERESTARTSYS;
2233 goto _end_unlock;
2234 case EXPIRED:
2235 snd_printd("playback write error (DMA or IRQ trouble?)\n");
2236 err = -EIO;
2237 goto _end_unlock;
443feb88
KW		 2238 case DROPPED:
2239 err = -EBADFD;
2240 goto _end_unlock;
1da177e4
LT		 2241 default:
2242 break;
2243 }
2244 }
2245 if (avail > runtime->xfer_align)
2246 avail -= avail % runtime->xfer_align;
2247 frames = size > avail ? avail : size;
2248 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2249 if (frames > cont)
2250 frames = cont;
2251 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2252 appl_ptr = runtime->control->appl_ptr;
2253 appl_ofs = appl_ptr % runtime->buffer_size;
2254 snd_pcm_stream_unlock_irq(substream);
2255 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2256 goto _end;
2257 snd_pcm_stream_lock_irq(substream);
2258 switch (runtime->status->state) {
2259 case SNDRV_PCM_STATE_XRUN:
2260 err = -EPIPE;
2261 goto _end_unlock;
2262 case SNDRV_PCM_STATE_SUSPENDED:
2263 err = -ESTRPIPE;
2264 goto _end_unlock;
2265 default:
2266 break;
2267 }
2268 appl_ptr += frames;
2269 if (appl_ptr >= runtime->boundary)
2270 appl_ptr -= runtime->boundary;
2271 runtime->control->appl_ptr = appl_ptr;
2272 if (substream->ops->ack)
2273 substream->ops->ack(substream);
2274
2275 offset += frames;
2276 size -= frames;
2277 xfer += frames;
2278 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2279 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2280 err = snd_pcm_start(substream);
2281 if (err < 0)
2282 goto _end_unlock;
2283 }
2284 if (runtime->sleep_min &&
2285 runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2286 snd_pcm_tick_prepare(substream);
2287 }
2288 _end_unlock:
2289 snd_pcm_stream_unlock_irq(substream);
2290 _end:
2291 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2292}
2293
2294snd_pcm_sframes_t snd_pcm_lib_write(snd_pcm_substream_t *substream, const void __user *buf, snd_pcm_uframes_t size)
2295{
2296 snd_pcm_runtime_t *runtime;
2297 int nonblock;
2298
2299 snd_assert(substream != NULL, return -ENXIO);
2300 runtime = substream->runtime;
2301 snd_assert(runtime != NULL, return -ENXIO);
2302 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2303 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2304 return -EBADFD;
2305
2306 snd_assert(substream->ffile != NULL, return -ENXIO);
2307 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2308#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2309 if (substream->oss.oss) {
2310 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2311 if (setup != NULL) {
2312 if (setup->nonblock)
2313 nonblock = 1;
2314 else if (setup->block)
2315 nonblock = 0;
2316 }
2317 }
2318#endif
2319
2320 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2321 runtime->channels > 1)
2322 return -EINVAL;
2323 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2324 snd_pcm_lib_write_transfer);
2325}
2326
2327static int snd_pcm_lib_writev_transfer(snd_pcm_substream_t *substream,
2328 unsigned int hwoff,
2329 unsigned long data, unsigned int off,
2330 snd_pcm_uframes_t frames)
2331{
2332 snd_pcm_runtime_t *runtime = substream->runtime;
2333 int err;
2334 void __user **bufs = (void __user **)data;
2335 int channels = runtime->channels;
2336 int c;
2337 if (substream->ops->copy) {
2338 snd_assert(substream->ops->silence != NULL, return -EINVAL);
2339 for (c = 0; c < channels; ++c, ++bufs) {
2340 if (*bufs == NULL) {
2341 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2342 return err;
2343 } else {
2344 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2345 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2346 return err;
2347 }
2348 }
2349 } else {
2350 /* default transfer behaviour */
2351 size_t dma_csize = runtime->dma_bytes / channels;
2352 snd_assert(runtime->dma_area, return -EFAULT);
2353 for (c = 0; c < channels; ++c, ++bufs) {
2354 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2355 if (*bufs == NULL) {
2356 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2357 } else {
2358 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2359 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2360 return -EFAULT;
2361 }
2362 }
2363 }
2364 return 0;
2365}
2366
2367snd_pcm_sframes_t snd_pcm_lib_writev(snd_pcm_substream_t *substream,
2368 void __user **bufs,
2369 snd_pcm_uframes_t frames)
2370{
2371 snd_pcm_runtime_t *runtime;
2372 int nonblock;
2373
2374 snd_assert(substream != NULL, return -ENXIO);
2375 runtime = substream->runtime;
2376 snd_assert(runtime != NULL, return -ENXIO);
2377 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2378 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2379 return -EBADFD;
2380
2381 snd_assert(substream->ffile != NULL, return -ENXIO);
2382 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2383#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2384 if (substream->oss.oss) {
2385 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2386 if (setup != NULL) {
2387 if (setup->nonblock)
2388 nonblock = 1;
2389 else if (setup->block)
2390 nonblock = 0;
2391 }
2392 }
2393#endif
2394
2395 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2396 return -EINVAL;
2397 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2398 nonblock, snd_pcm_lib_writev_transfer);
2399}
2400
2401static int snd_pcm_lib_read_transfer(snd_pcm_substream_t *substream,
2402 unsigned int hwoff,
2403 unsigned long data, unsigned int off,
2404 snd_pcm_uframes_t frames)
2405{
2406 snd_pcm_runtime_t *runtime = substream->runtime;
2407 int err;
2408 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2409 if (substream->ops->copy) {
2410 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2411 return err;
2412 } else {
2413 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2414 snd_assert(runtime->dma_area, return -EFAULT);
2415 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2416 return -EFAULT;
2417 }
2418 return 0;
2419}
2420
2421static snd_pcm_sframes_t snd_pcm_lib_read1(snd_pcm_substream_t *substream,
2422 unsigned long data,
2423 snd_pcm_uframes_t size,
2424 int nonblock,
2425 transfer_f transfer)
2426{
2427 snd_pcm_runtime_t *runtime = substream->runtime;
2428 snd_pcm_uframes_t xfer = 0;
2429 snd_pcm_uframes_t offset = 0;
2430 int err = 0;
2431
2432 if (size == 0)
2433 return 0;
2434 if (size > runtime->xfer_align)
2435 size -= size % runtime->xfer_align;
2436
2437 snd_pcm_stream_lock_irq(substream);
2438 switch (runtime->status->state) {
2439 case SNDRV_PCM_STATE_PREPARED:
2440 if (size >= runtime->start_threshold) {
2441 err = snd_pcm_start(substream);
2442 if (err < 0)
2443 goto _end_unlock;
2444 }
2445 break;
2446 case SNDRV_PCM_STATE_DRAINING:
2447 case SNDRV_PCM_STATE_RUNNING:
2448 case SNDRV_PCM_STATE_PAUSED:
2449 break;
2450 case SNDRV_PCM_STATE_XRUN:
2451 err = -EPIPE;
2452 goto _end_unlock;
2453 case SNDRV_PCM_STATE_SUSPENDED:
2454 err = -ESTRPIPE;
2455 goto _end_unlock;
2456 default:
2457 err = -EBADFD;
2458 goto _end_unlock;
2459 }
2460
2461 while (size > 0) {
2462 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2463 snd_pcm_uframes_t avail;
2464 snd_pcm_uframes_t cont;
2465 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2466 snd_pcm_update_hw_ptr(substream);
2467 __draining:
2468 avail = snd_pcm_capture_avail(runtime);
2469 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2470 if (avail < runtime->xfer_align) {
2471 err = -EPIPE;
2472 goto _end_unlock;
2473 }
2474 } else if ((avail < runtime->control->avail_min && size > avail) ||
2475 (size >= runtime->xfer_align && avail < runtime->xfer_align)) {
2476 wait_queue_t wait;
443feb88 2477 enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
1da177e4
LT		 2478 long tout;
2479
2480 if (nonblock) {
2481 err = -EAGAIN;
2482 goto _end_unlock;
2483 }
2484
2485 init_waitqueue_entry(&wait, current);
2486 add_wait_queue(&runtime->sleep, &wait);
2487 while (1) {
2488 if (signal_pending(current)) {
2489 state = SIGNALED;
2490 break;
2491 }
2492 set_current_state(TASK_INTERRUPTIBLE);
2493 snd_pcm_stream_unlock_irq(substream);
2494 tout = schedule_timeout(10 * HZ);
2495 snd_pcm_stream_lock_irq(substream);
2496 if (tout == 0) {
2497 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2498 runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2499 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2500 break;
2501 }
2502 }
2503 switch (runtime->status->state) {
2504 case SNDRV_PCM_STATE_XRUN:
2505 state = ERROR;
2506 goto _end_loop;
2507 case SNDRV_PCM_STATE_SUSPENDED:
2508 state = SUSPENDED;
2509 goto _end_loop;
2510 case SNDRV_PCM_STATE_DRAINING:
2511 goto __draining;
443feb88
KW		 2512 case SNDRV_PCM_STATE_SETUP:
2513 state = DROPPED;
2514 goto _end_loop;
1da177e4
LT		 2515 default:
2516 break;
2517 }
2518 avail = snd_pcm_capture_avail(runtime);
2519 if (avail >= runtime->control->avail_min) {
2520 state = READY;
2521 break;
2522 }
2523 }
2524 _end_loop:
2525 remove_wait_queue(&runtime->sleep, &wait);
2526
2527 switch (state) {
2528 case ERROR:
2529 err = -EPIPE;
2530 goto _end_unlock;
2531 case SUSPENDED:
2532 err = -ESTRPIPE;
2533 goto _end_unlock;
2534 case SIGNALED:
2535 err = -ERESTARTSYS;
2536 goto _end_unlock;
2537 case EXPIRED:
2538 snd_printd("capture read error (DMA or IRQ trouble?)\n");
2539 err = -EIO;
2540 goto _end_unlock;
443feb88
KW		 2541 case DROPPED:
2542 err = -EBADFD;
2543 goto _end_unlock;
1da177e4
LT		 2544 default:
2545 break;
2546 }
2547 }
2548 if (avail > runtime->xfer_align)
2549 avail -= avail % runtime->xfer_align;
2550 frames = size > avail ? avail : size;
2551 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2552 if (frames > cont)
2553 frames = cont;
2554 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2555 appl_ptr = runtime->control->appl_ptr;
2556 appl_ofs = appl_ptr % runtime->buffer_size;
2557 snd_pcm_stream_unlock_irq(substream);
2558 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2559 goto _end;
2560 snd_pcm_stream_lock_irq(substream);
2561 switch (runtime->status->state) {
2562 case SNDRV_PCM_STATE_XRUN:
2563 err = -EPIPE;
2564 goto _end_unlock;
2565 case SNDRV_PCM_STATE_SUSPENDED:
2566 err = -ESTRPIPE;
2567 goto _end_unlock;
2568 default:
2569 break;
2570 }
2571 appl_ptr += frames;
2572 if (appl_ptr >= runtime->boundary)
2573 appl_ptr -= runtime->boundary;
2574 runtime->control->appl_ptr = appl_ptr;
2575 if (substream->ops->ack)
2576 substream->ops->ack(substream);
2577
2578 offset += frames;
2579 size -= frames;
2580 xfer += frames;
2581 if (runtime->sleep_min &&
2582 runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2583 snd_pcm_tick_prepare(substream);
2584 }
2585 _end_unlock:
2586 snd_pcm_stream_unlock_irq(substream);
2587 _end:
2588 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2589}
2590
2591snd_pcm_sframes_t snd_pcm_lib_read(snd_pcm_substream_t *substream, void __user *buf, snd_pcm_uframes_t size)
2592{
2593 snd_pcm_runtime_t *runtime;
2594 int nonblock;
2595
2596 snd_assert(substream != NULL, return -ENXIO);
2597 runtime = substream->runtime;
2598 snd_assert(runtime != NULL, return -ENXIO);
2599 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2600 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2601 return -EBADFD;
2602
2603 snd_assert(substream->ffile != NULL, return -ENXIO);
2604 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2605#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2606 if (substream->oss.oss) {
2607 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2608 if (setup != NULL) {
2609 if (setup->nonblock)
2610 nonblock = 1;
2611 else if (setup->block)
2612 nonblock = 0;
2613 }
2614 }
2615#endif
2616 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2617 return -EINVAL;
2618 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2619}
2620
2621static int snd_pcm_lib_readv_transfer(snd_pcm_substream_t *substream,
2622 unsigned int hwoff,
2623 unsigned long data, unsigned int off,
2624 snd_pcm_uframes_t frames)
2625{
2626 snd_pcm_runtime_t *runtime = substream->runtime;
2627 int err;
2628 void __user **bufs = (void __user **)data;
2629 int channels = runtime->channels;
2630 int c;
2631 if (substream->ops->copy) {
2632 for (c = 0; c < channels; ++c, ++bufs) {
2633 char __user *buf;
2634 if (*bufs == NULL)
2635 continue;
2636 buf = *bufs + samples_to_bytes(runtime, off);
2637 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2638 return err;
2639 }
2640 } else {
2641 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2642 snd_assert(runtime->dma_area, return -EFAULT);
2643 for (c = 0; c < channels; ++c, ++bufs) {
2644 char *hwbuf;
2645 char __user *buf;
2646 if (*bufs == NULL)
2647 continue;
2648
2649 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2650 buf = *bufs + samples_to_bytes(runtime, off);
2651 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2652 return -EFAULT;
2653 }
2654 }
2655 return 0;
2656}
2657
2658snd_pcm_sframes_t snd_pcm_lib_readv(snd_pcm_substream_t *substream,
2659 void __user **bufs,
2660 snd_pcm_uframes_t frames)
2661{
2662 snd_pcm_runtime_t *runtime;
2663 int nonblock;
2664
2665 snd_assert(substream != NULL, return -ENXIO);
2666 runtime = substream->runtime;
2667 snd_assert(runtime != NULL, return -ENXIO);
2668 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2669 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2670 return -EBADFD;
2671
2672 snd_assert(substream->ffile != NULL, return -ENXIO);
2673 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2674#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2675 if (substream->oss.oss) {
2676 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2677 if (setup != NULL) {
2678 if (setup->nonblock)
2679 nonblock = 1;
2680 else if (setup->block)
2681 nonblock = 0;
2682 }
2683 }
2684#endif
2685
2686 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2687 return -EINVAL;
2688 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2689}
2690
2691/*
2692 * Exported symbols
2693 */
2694
2695EXPORT_SYMBOL(snd_interval_refine);
2696EXPORT_SYMBOL(snd_interval_list);
2697EXPORT_SYMBOL(snd_interval_ratnum);
1da177e4
LT		 2698EXPORT_SYMBOL(_snd_pcm_hw_params_any);
2699EXPORT_SYMBOL(_snd_pcm_hw_param_min);
2700EXPORT_SYMBOL(_snd_pcm_hw_param_set);
2701EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
2702EXPORT_SYMBOL(_snd_pcm_hw_param_setinteger);
2703EXPORT_SYMBOL(snd_pcm_hw_param_value_min);
2704EXPORT_SYMBOL(snd_pcm_hw_param_value_max);
2705EXPORT_SYMBOL(snd_pcm_hw_param_mask);
2706EXPORT_SYMBOL(snd_pcm_hw_param_first);
2707EXPORT_SYMBOL(snd_pcm_hw_param_last);
2708EXPORT_SYMBOL(snd_pcm_hw_param_near);
2709EXPORT_SYMBOL(snd_pcm_hw_param_set);
2710EXPORT_SYMBOL(snd_pcm_hw_refine);
1da177e4
LT		 2711EXPORT_SYMBOL(snd_pcm_hw_constraints_init);
2712EXPORT_SYMBOL(snd_pcm_hw_constraints_complete);
2713EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
2714EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
2715EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
2716EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
2717EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
2718EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
2719EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
2720EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
2721EXPORT_SYMBOL(snd_pcm_hw_rule_add);
2722EXPORT_SYMBOL(snd_pcm_set_ops);
2723EXPORT_SYMBOL(snd_pcm_set_sync);
2724EXPORT_SYMBOL(snd_pcm_lib_ioctl);
2725EXPORT_SYMBOL(snd_pcm_stop);
2726EXPORT_SYMBOL(snd_pcm_period_elapsed);
2727EXPORT_SYMBOL(snd_pcm_lib_write);
2728EXPORT_SYMBOL(snd_pcm_lib_read);
2729EXPORT_SYMBOL(snd_pcm_lib_writev);
2730EXPORT_SYMBOL(snd_pcm_lib_readv);
2731EXPORT_SYMBOL(snd_pcm_lib_buffer_bytes);
2732EXPORT_SYMBOL(snd_pcm_lib_period_bytes);
2733/* pcm_memory.c */
2734EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
2735EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages);
2736EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all);
2737EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
2738EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
2739EXPORT_SYMBOL(snd_pcm_lib_free_pages);
Linux kernel - Deliverables
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