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[X86] Remove Winchip 4 ID.
[linux-2.6/mini2440.git] / sound / core / pcm_lib.c
blob3dbf9bf2ac162ef49cb40f79805b99927384c7e9
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 getnstimeofday((struct timespec *)&runtime->status->tstamp);
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 }
160 #endif
161 pos -= pos % runtime->min_align;
162 return pos;
163 }
164
165 static inline int snd_pcm_update_hw_ptr_post(snd_pcm_substream_t *substream,
166 snd_pcm_runtime_t *runtime)
167 {
168 snd_pcm_uframes_t avail;
169
170 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
171 avail = snd_pcm_playback_avail(runtime);
172 else
173 avail = snd_pcm_capture_avail(runtime);
174 if (avail > runtime->avail_max)
175 runtime->avail_max = avail;
176 if (avail >= runtime->stop_threshold) {
177 if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
178 snd_pcm_drain_done(substream);
179 else
180 xrun(substream);
181 return -EPIPE;
182 }
183 if (avail >= runtime->control->avail_min)
184 wake_up(&runtime->sleep);
185 return 0;
186 }
187
188 static inline int snd_pcm_update_hw_ptr_interrupt(snd_pcm_substream_t *substream)
189 {
190 snd_pcm_runtime_t *runtime = substream->runtime;
191 snd_pcm_uframes_t pos;
192 snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt;
193 snd_pcm_sframes_t delta;
194
195 pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
196 if (pos == SNDRV_PCM_POS_XRUN) {
197 xrun(substream);
198 return -EPIPE;
199 }
200 if (runtime->period_size == runtime->buffer_size)
201 goto __next_buf;
202 new_hw_ptr = runtime->hw_ptr_base + pos;
203 hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
204
205 delta = hw_ptr_interrupt - new_hw_ptr;
206 if (delta > 0) {
207 if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
208 #ifdef CONFIG_SND_DEBUG
209 if (runtime->periods > 1 && substream->pstr->xrun_debug) {
210 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);
211 if (substream->pstr->xrun_debug > 1)
212 dump_stack();
213 }
214 #endif
215 return 0;
216 }
217 __next_buf:
218 runtime->hw_ptr_base += runtime->buffer_size;
219 if (runtime->hw_ptr_base == runtime->boundary)
220 runtime->hw_ptr_base = 0;
221 new_hw_ptr = runtime->hw_ptr_base + pos;
222 }
223
224 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
225 runtime->silence_size > 0)
226 snd_pcm_playback_silence(substream, new_hw_ptr);
227
228 runtime->status->hw_ptr = new_hw_ptr;
229 runtime->hw_ptr_interrupt = new_hw_ptr - new_hw_ptr % runtime->period_size;
230
231 return snd_pcm_update_hw_ptr_post(substream, runtime);
232 }
233
234 /* CAUTION: call it with irq disabled */
235 int snd_pcm_update_hw_ptr(snd_pcm_substream_t *substream)
236 {
237 snd_pcm_runtime_t *runtime = substream->runtime;
238 snd_pcm_uframes_t pos;
239 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr;
240 snd_pcm_sframes_t delta;
241
242 old_hw_ptr = runtime->status->hw_ptr;
243 pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
244 if (pos == SNDRV_PCM_POS_XRUN) {
245 xrun(substream);
246 return -EPIPE;
247 }
248 new_hw_ptr = runtime->hw_ptr_base + pos;
249
250 delta = old_hw_ptr - new_hw_ptr;
251 if (delta > 0) {
252 if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
253 #ifdef CONFIG_SND_DEBUG
254 if (runtime->periods > 2 && substream->pstr->xrun_debug) {
255 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);
256 if (substream->pstr->xrun_debug > 1)
257 dump_stack();
258 }
259 #endif
260 return 0;
261 }
262 runtime->hw_ptr_base += runtime->buffer_size;
263 if (runtime->hw_ptr_base == runtime->boundary)
264 runtime->hw_ptr_base = 0;
265 new_hw_ptr = runtime->hw_ptr_base + pos;
266 }
267 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
268 runtime->silence_size > 0)
269 snd_pcm_playback_silence(substream, new_hw_ptr);
270
271 runtime->status->hw_ptr = new_hw_ptr;
272
273 return snd_pcm_update_hw_ptr_post(substream, runtime);
274 }
275
276 /**
277 * snd_pcm_set_ops - set the PCM operators
278 * @pcm: the pcm instance
279 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
280 * @ops: the operator table
281 *
282 * Sets the given PCM operators to the pcm instance.
283 */
284 void snd_pcm_set_ops(snd_pcm_t *pcm, int direction, snd_pcm_ops_t *ops)
285 {
286 snd_pcm_str_t *stream = &pcm->streams[direction];
287 snd_pcm_substream_t *substream;
288
289 for (substream = stream->substream; substream != NULL; substream = substream->next)
290 substream->ops = ops;
291 }
292
293
294 /**
295 * snd_pcm_sync - set the PCM sync id
296 * @substream: the pcm substream
297 *
298 * Sets the PCM sync identifier for the card.
299 */
300 void snd_pcm_set_sync(snd_pcm_substream_t * substream)
301 {
302 snd_pcm_runtime_t *runtime = substream->runtime;
303
304 runtime->sync.id32[0] = substream->pcm->card->number;
305 runtime->sync.id32[1] = -1;
306 runtime->sync.id32[2] = -1;
307 runtime->sync.id32[3] = -1;
308 }
309
310 /*
311 * Standard ioctl routine
312 */
313
314 /* Code taken from alsa-lib */
315 #define assert(a) snd_assert((a), return -EINVAL)
316
317 static inline unsigned int div32(unsigned int a, unsigned int b,
318 unsigned int *r)
319 {
320 if (b == 0) {
321 *r = 0;
322 return UINT_MAX;
323 }
324 *r = a % b;
325 return a / b;
326 }
327
328 static inline unsigned int div_down(unsigned int a, unsigned int b)
329 {
330 if (b == 0)
331 return UINT_MAX;
332 return a / b;
333 }
334
335 static inline unsigned int div_up(unsigned int a, unsigned int b)
336 {
337 unsigned int r;
338 unsigned int q;
339 if (b == 0)
340 return UINT_MAX;
341 q = div32(a, b, &r);
342 if (r)
343 ++q;
344 return q;
345 }
346
347 static inline unsigned int mul(unsigned int a, unsigned int b)
348 {
349 if (a == 0)
350 return 0;
351 if (div_down(UINT_MAX, a) < b)
352 return UINT_MAX;
353 return a * b;
354 }
355
356 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
357 unsigned int c, unsigned int *r)
358 {
359 u_int64_t n = (u_int64_t) a * b;
360 if (c == 0) {
361 snd_assert(n > 0, );
362 *r = 0;
363 return UINT_MAX;
364 }
365 div64_32(&n, c, r);
366 if (n >= UINT_MAX) {
367 *r = 0;
368 return UINT_MAX;
369 }
370 return n;
371 }
372
373 static int snd_interval_refine_min(snd_interval_t *i, unsigned int min, int openmin)
374 {
375 int changed = 0;
376 assert(!snd_interval_empty(i));
377 if (i->min < min) {
378 i->min = min;
379 i->openmin = openmin;
380 changed = 1;
381 } else if (i->min == min && !i->openmin && openmin) {
382 i->openmin = 1;
383 changed = 1;
384 }
385 if (i->integer) {
386 if (i->openmin) {
387 i->min++;
388 i->openmin = 0;
389 }
390 }
391 if (snd_interval_checkempty(i)) {
392 snd_interval_none(i);
393 return -EINVAL;
394 }
395 return changed;
396 }
397
398 static int snd_interval_refine_max(snd_interval_t *i, unsigned int max, int openmax)
399 {
400 int changed = 0;
401 assert(!snd_interval_empty(i));
402 if (i->max > max) {
403 i->max = max;
404 i->openmax = openmax;
405 changed = 1;
406 } else if (i->max == max && !i->openmax && openmax) {
407 i->openmax = 1;
408 changed = 1;
409 }
410 if (i->integer) {
411 if (i->openmax) {
412 i->max--;
413 i->openmax = 0;
414 }
415 }
416 if (snd_interval_checkempty(i)) {
417 snd_interval_none(i);
418 return -EINVAL;
419 }
420 return changed;
421 }
422
423 /**
424 * snd_interval_refine - refine the interval value of configurator
425 * @i: the interval value to refine
426 * @v: the interval value to refer to
427 *
428 * Refines the interval value with the reference value.
429 * The interval is changed to the range satisfying both intervals.
430 * The interval status (min, max, integer, etc.) are evaluated.
431 *
432 * Returns non-zero if the value is changed, zero if not changed.
433 */
434 int snd_interval_refine(snd_interval_t *i, const snd_interval_t *v)
435 {
436 int changed = 0;
437 assert(!snd_interval_empty(i));
438 if (i->min < v->min) {
439 i->min = v->min;
440 i->openmin = v->openmin;
441 changed = 1;
442 } else if (i->min == v->min && !i->openmin && v->openmin) {
443 i->openmin = 1;
444 changed = 1;
445 }
446 if (i->max > v->max) {
447 i->max = v->max;
448 i->openmax = v->openmax;
449 changed = 1;
450 } else if (i->max == v->max && !i->openmax && v->openmax) {
451 i->openmax = 1;
452 changed = 1;
453 }
454 if (!i->integer && v->integer) {
455 i->integer = 1;
456 changed = 1;
457 }
458 if (i->integer) {
459 if (i->openmin) {
460 i->min++;
461 i->openmin = 0;
462 }
463 if (i->openmax) {
464 i->max--;
465 i->openmax = 0;
466 }
467 } else if (!i->openmin && !i->openmax && i->min == i->max)
468 i->integer = 1;
469 if (snd_interval_checkempty(i)) {
470 snd_interval_none(i);
471 return -EINVAL;
472 }
473 return changed;
474 }
475
476 static int snd_interval_refine_first(snd_interval_t *i)
477 {
478 assert(!snd_interval_empty(i));
479 if (snd_interval_single(i))
480 return 0;
481 i->max = i->min;
482 i->openmax = i->openmin;
483 if (i->openmax)
484 i->max++;
485 return 1;
486 }
487
488 static int snd_interval_refine_last(snd_interval_t *i)
489 {
490 assert(!snd_interval_empty(i));
491 if (snd_interval_single(i))
492 return 0;
493 i->min = i->max;
494 i->openmin = i->openmax;
495 if (i->openmin)
496 i->min--;
497 return 1;
498 }
499
500 static int snd_interval_refine_set(snd_interval_t *i, unsigned int val)
501 {
502 snd_interval_t t;
503 t.empty = 0;
504 t.min = t.max = val;
505 t.openmin = t.openmax = 0;
506 t.integer = 1;
507 return snd_interval_refine(i, &t);
508 }
509
510 void snd_interval_mul(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c)
511 {
512 if (a->empty || b->empty) {
513 snd_interval_none(c);
514 return;
515 }
516 c->empty = 0;
517 c->min = mul(a->min, b->min);
518 c->openmin = (a->openmin || b->openmin);
519 c->max = mul(a->max, b->max);
520 c->openmax = (a->openmax || b->openmax);
521 c->integer = (a->integer && b->integer);
522 }
523
524 /**
525 * snd_interval_div - refine the interval value with division
526 * @a: dividend
527 * @b: divisor
528 * @c: quotient
529 *
530 * c = a / b
531 *
532 * Returns non-zero if the value is changed, zero if not changed.
533 */
534 void snd_interval_div(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c)
535 {
536 unsigned int r;
537 if (a->empty || b->empty) {
538 snd_interval_none(c);
539 return;
540 }
541 c->empty = 0;
542 c->min = div32(a->min, b->max, &r);
543 c->openmin = (r || a->openmin || b->openmax);
544 if (b->min > 0) {
545 c->max = div32(a->max, b->min, &r);
546 if (r) {
547 c->max++;
548 c->openmax = 1;
549 } else
550 c->openmax = (a->openmax || b->openmin);
551 } else {
552 c->max = UINT_MAX;
553 c->openmax = 0;
554 }
555 c->integer = 0;
556 }
557
558 /**
559 * snd_interval_muldivk - refine the interval value
560 * @a: dividend 1
561 * @b: dividend 2
562 * @k: divisor (as integer)
563 * @c: result
564 *
565 * c = a * b / k
566 *
567 * Returns non-zero if the value is changed, zero if not changed.
568 */
569 void snd_interval_muldivk(const snd_interval_t *a, const snd_interval_t *b,
570 unsigned int k, snd_interval_t *c)
571 {
572 unsigned int r;
573 if (a->empty || b->empty) {
574 snd_interval_none(c);
575 return;
576 }
577 c->empty = 0;
578 c->min = muldiv32(a->min, b->min, k, &r);
579 c->openmin = (r || a->openmin || b->openmin);
580 c->max = muldiv32(a->max, b->max, k, &r);
581 if (r) {
582 c->max++;
583 c->openmax = 1;
584 } else
585 c->openmax = (a->openmax || b->openmax);
586 c->integer = 0;
587 }
588
589 /**
590 * snd_interval_mulkdiv - refine the interval value
591 * @a: dividend 1
592 * @k: dividend 2 (as integer)
593 * @b: divisor
594 * @c: result
595 *
596 * c = a * k / b
597 *
598 * Returns non-zero if the value is changed, zero if not changed.
599 */
600 void snd_interval_mulkdiv(const snd_interval_t *a, unsigned int k,
601 const snd_interval_t *b, snd_interval_t *c)
602 {
603 unsigned int r;
604 if (a->empty || b->empty) {
605 snd_interval_none(c);
606 return;
607 }
608 c->empty = 0;
609 c->min = muldiv32(a->min, k, b->max, &r);
610 c->openmin = (r || a->openmin || b->openmax);
611 if (b->min > 0) {
612 c->max = muldiv32(a->max, k, b->min, &r);
613 if (r) {
614 c->max++;
615 c->openmax = 1;
616 } else
617 c->openmax = (a->openmax || b->openmin);
618 } else {
619 c->max = UINT_MAX;
620 c->openmax = 0;
621 }
622 c->integer = 0;
623 }
624
625 #undef assert
626 /* ---- */
627
628
629 /**
630 * snd_interval_ratnum - refine the interval value
631 * @i: interval to refine
632 * @rats_count: number of ratnum_t
633 * @rats: ratnum_t array
634 * @nump: pointer to store the resultant numerator
635 * @denp: pointer to store the resultant denominator
636 *
637 * Returns non-zero if the value is changed, zero if not changed.
638 */
639 int snd_interval_ratnum(snd_interval_t *i,
640 unsigned int rats_count, ratnum_t *rats,
641 unsigned int *nump, unsigned int *denp)
642 {
643 unsigned int best_num, best_diff, best_den;
644 unsigned int k;
645 snd_interval_t t;
646 int err;
647
648 best_num = best_den = best_diff = 0;
649 for (k = 0; k < rats_count; ++k) {
650 unsigned int num = rats[k].num;
651 unsigned int den;
652 unsigned int q = i->min;
653 int diff;
654 if (q == 0)
655 q = 1;
656 den = div_down(num, q);
657 if (den < rats[k].den_min)
658 continue;
659 if (den > rats[k].den_max)
660 den = rats[k].den_max;
661 else {
662 unsigned int r;
663 r = (den - rats[k].den_min) % rats[k].den_step;
664 if (r != 0)
665 den -= r;
666 }
667 diff = num - q * den;
668 if (best_num == 0 ||
669 diff * best_den < best_diff * den) {
670 best_diff = diff;
671 best_den = den;
672 best_num = num;
673 }
674 }
675 if (best_den == 0) {
676 i->empty = 1;
677 return -EINVAL;
678 }
679 t.min = div_down(best_num, best_den);
680 t.openmin = !!(best_num % best_den);
681
682 best_num = best_den = best_diff = 0;
683 for (k = 0; k < rats_count; ++k) {
684 unsigned int num = rats[k].num;
685 unsigned int den;
686 unsigned int q = i->max;
687 int diff;
688 if (q == 0) {
689 i->empty = 1;
690 return -EINVAL;
691 }
692 den = div_up(num, q);
693 if (den > rats[k].den_max)
694 continue;
695 if (den < rats[k].den_min)
696 den = rats[k].den_min;
697 else {
698 unsigned int r;
699 r = (den - rats[k].den_min) % rats[k].den_step;
700 if (r != 0)
701 den += rats[k].den_step - r;
702 }
703 diff = q * den - num;
704 if (best_num == 0 ||
705 diff * best_den < best_diff * den) {
706 best_diff = diff;
707 best_den = den;
708 best_num = num;
709 }
710 }
711 if (best_den == 0) {
712 i->empty = 1;
713 return -EINVAL;
714 }
715 t.max = div_up(best_num, best_den);
716 t.openmax = !!(best_num % best_den);
717 t.integer = 0;
718 err = snd_interval_refine(i, &t);
719 if (err < 0)
720 return err;
721
722 if (snd_interval_single(i)) {
723 if (nump)
724 *nump = best_num;
725 if (denp)
726 *denp = best_den;
727 }
728 return err;
729 }
730
731 /**
732 * snd_interval_ratden - refine the interval value
733 * @i: interval to refine
734 * @rats_count: number of ratden_t
735 * @rats: ratden_t array
736 * @nump: pointer to store the resultant numerator
737 * @denp: pointer to store the resultant denominator
738 *
739 * Returns non-zero if the value is changed, zero if not changed.
740 */
741 static int snd_interval_ratden(snd_interval_t *i,
742 unsigned int rats_count, ratden_t *rats,
743 unsigned int *nump, unsigned int *denp)
744 {
745 unsigned int best_num, best_diff, best_den;
746 unsigned int k;
747 snd_interval_t t;
748 int err;
749
750 best_num = best_den = best_diff = 0;
751 for (k = 0; k < rats_count; ++k) {
752 unsigned int num;
753 unsigned int den = rats[k].den;
754 unsigned int q = i->min;
755 int diff;
756 num = mul(q, den);
757 if (num > rats[k].num_max)
758 continue;
759 if (num < rats[k].num_min)
760 num = rats[k].num_max;
761 else {
762 unsigned int r;
763 r = (num - rats[k].num_min) % rats[k].num_step;
764 if (r != 0)
765 num += rats[k].num_step - r;
766 }
767 diff = num - q * den;
768 if (best_num == 0 ||
769 diff * best_den < best_diff * den) {
770 best_diff = diff;
771 best_den = den;
772 best_num = num;
773 }
774 }
775 if (best_den == 0) {
776 i->empty = 1;
777 return -EINVAL;
778 }
779 t.min = div_down(best_num, best_den);
780 t.openmin = !!(best_num % best_den);
781
782 best_num = best_den = best_diff = 0;
783 for (k = 0; k < rats_count; ++k) {
784 unsigned int num;
785 unsigned int den = rats[k].den;
786 unsigned int q = i->max;
787 int diff;
788 num = mul(q, den);
789 if (num < rats[k].num_min)
790 continue;
791 if (num > rats[k].num_max)
792 num = rats[k].num_max;
793 else {
794 unsigned int r;
795 r = (num - rats[k].num_min) % rats[k].num_step;
796 if (r != 0)
797 num -= r;
798 }
799 diff = q * den - num;
800 if (best_num == 0 ||
801 diff * best_den < best_diff * den) {
802 best_diff = diff;
803 best_den = den;
804 best_num = num;
805 }
806 }
807 if (best_den == 0) {
808 i->empty = 1;
809 return -EINVAL;
810 }
811 t.max = div_up(best_num, best_den);
812 t.openmax = !!(best_num % best_den);
813 t.integer = 0;
814 err = snd_interval_refine(i, &t);
815 if (err < 0)
816 return err;
817
818 if (snd_interval_single(i)) {
819 if (nump)
820 *nump = best_num;
821 if (denp)
822 *denp = best_den;
823 }
824 return err;
825 }
826
827 /**
828 * snd_interval_list - refine the interval value from the list
829 * @i: the interval value to refine
830 * @count: the number of elements in the list
831 * @list: the value list
832 * @mask: the bit-mask to evaluate
833 *
834 * Refines the interval value from the list.
835 * When mask is non-zero, only the elements corresponding to bit 1 are
836 * evaluated.
837 *
838 * Returns non-zero if the value is changed, zero if not changed.
839 */
840 int snd_interval_list(snd_interval_t *i, unsigned int count, unsigned int *list, unsigned int mask)
841 {
842 unsigned int k;
843 int changed = 0;
844 for (k = 0; k < count; k++) {
845 if (mask && !(mask & (1 << k)))
846 continue;
847 if (i->min == list[k] && !i->openmin)
848 goto _l1;
849 if (i->min < list[k]) {
850 i->min = list[k];
851 i->openmin = 0;
852 changed = 1;
853 goto _l1;
854 }
855 }
856 i->empty = 1;
857 return -EINVAL;
858 _l1:
859 for (k = count; k-- > 0;) {
860 if (mask && !(mask & (1 << k)))
861 continue;
862 if (i->max == list[k] && !i->openmax)
863 goto _l2;
864 if (i->max > list[k]) {
865 i->max = list[k];
866 i->openmax = 0;
867 changed = 1;
868 goto _l2;
869 }
870 }
871 i->empty = 1;
872 return -EINVAL;
873 _l2:
874 if (snd_interval_checkempty(i)) {
875 i->empty = 1;
876 return -EINVAL;
877 }
878 return changed;
879 }
880
881 static int snd_interval_step(snd_interval_t *i, unsigned int min, unsigned int step)
882 {
883 unsigned int n;
884 int changed = 0;
885 n = (i->min - min) % step;
886 if (n != 0 || i->openmin) {
887 i->min += step - n;
888 changed = 1;
889 }
890 n = (i->max - min) % step;
891 if (n != 0 || i->openmax) {
892 i->max -= n;
893 changed = 1;
894 }
895 if (snd_interval_checkempty(i)) {
896 i->empty = 1;
897 return -EINVAL;
898 }
899 return changed;
900 }
901
902 /* Info constraints helpers */
903
904 /**
905 * snd_pcm_hw_rule_add - add the hw-constraint rule
906 * @runtime: the pcm runtime instance
907 * @cond: condition bits
908 * @var: the variable to evaluate
909 * @func: the evaluation function
910 * @private: the private data pointer passed to function
911 * @dep: the dependent variables
912 *
913 * Returns zero if successful, or a negative error code on failure.
914 */
915 int snd_pcm_hw_rule_add(snd_pcm_runtime_t *runtime, unsigned int cond,
916 int var,
917 snd_pcm_hw_rule_func_t func, void *private,
918 int dep, ...)
919 {
920 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
921 snd_pcm_hw_rule_t *c;
922 unsigned int k;
923 va_list args;
924 va_start(args, dep);
925 if (constrs->rules_num >= constrs->rules_all) {
926 snd_pcm_hw_rule_t *new;
927 unsigned int new_rules = constrs->rules_all + 16;
928 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
929 if (!new)
930 return -ENOMEM;
931 if (constrs->rules) {
932 memcpy(new, constrs->rules,
933 constrs->rules_num * sizeof(*c));
934 kfree(constrs->rules);
935 }
936 constrs->rules = new;
937 constrs->rules_all = new_rules;
938 }
939 c = &constrs->rules[constrs->rules_num];
940 c->cond = cond;
941 c->func = func;
942 c->var = var;
943 c->private = private;
944 k = 0;
945 while (1) {
946 snd_assert(k < ARRAY_SIZE(c->deps), return -EINVAL);
947 c->deps[k++] = dep;
948 if (dep < 0)
949 break;
950 dep = va_arg(args, int);
951 }
952 constrs->rules_num++;
953 va_end(args);
954 return 0;
955 }
956
957 /**
958 * snd_pcm_hw_constraint_mask
959 * @runtime: PCM runtime instance
960 * @var: hw_params variable to apply the mask
961 * @mask: the bitmap mask
962 *
963 * Apply the constraint of the given bitmap mask to a mask parameter.
964 */
965 int snd_pcm_hw_constraint_mask(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
966 u_int32_t mask)
967 {
968 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
969 snd_mask_t *maskp = constrs_mask(constrs, var);
970 *maskp->bits &= mask;
971 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
972 if (*maskp->bits == 0)
973 return -EINVAL;
974 return 0;
975 }
976
977 /**
978 * snd_pcm_hw_constraint_mask64
979 * @runtime: PCM runtime instance
980 * @var: hw_params variable to apply the mask
981 * @mask: the 64bit bitmap mask
982 *
983 * Apply the constraint of the given bitmap mask to a mask parameter.
984 */
985 int snd_pcm_hw_constraint_mask64(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
986 u_int64_t mask)
987 {
988 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
989 snd_mask_t *maskp = constrs_mask(constrs, var);
990 maskp->bits[0] &= (u_int32_t)mask;
991 maskp->bits[1] &= (u_int32_t)(mask >> 32);
992 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
993 if (! maskp->bits[0] && ! maskp->bits[1])
994 return -EINVAL;
995 return 0;
996 }
997
998 /**
999 * snd_pcm_hw_constraint_integer
1000 * @runtime: PCM runtime instance
1001 * @var: hw_params variable to apply the integer constraint
1002 *
1003 * Apply the constraint of integer to an interval parameter.
1004 */
1005 int snd_pcm_hw_constraint_integer(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var)
1006 {
1007 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
1008 return snd_interval_setinteger(constrs_interval(constrs, var));
1009 }
1010
1011 /**
1012 * snd_pcm_hw_constraint_minmax
1013 * @runtime: PCM runtime instance
1014 * @var: hw_params variable to apply the range
1015 * @min: the minimal value
1016 * @max: the maximal value
1017 *
1018 * Apply the min/max range constraint to an interval parameter.
1019 */
1020 int snd_pcm_hw_constraint_minmax(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
1021 unsigned int min, unsigned int max)
1022 {
1023 snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
1024 snd_interval_t t;
1025 t.min = min;
1026 t.max = max;
1027 t.openmin = t.openmax = 0;
1028 t.integer = 0;
1029 return snd_interval_refine(constrs_interval(constrs, var), &t);
1030 }
1031
1032 static int snd_pcm_hw_rule_list(snd_pcm_hw_params_t *params,
1033 snd_pcm_hw_rule_t *rule)
1034 {
1035 snd_pcm_hw_constraint_list_t *list = rule->private;
1036 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1037 }
1038
1039
1040 /**
1041 * snd_pcm_hw_constraint_list
1042 * @runtime: PCM runtime instance
1043 * @cond: condition bits
1044 * @var: hw_params variable to apply the list constraint
1045 * @l: list
1046 *
1047 * Apply the list of constraints to an interval parameter.
1048 */
1049 int snd_pcm_hw_constraint_list(snd_pcm_runtime_t *runtime,
1050 unsigned int cond,
1051 snd_pcm_hw_param_t var,
1052 snd_pcm_hw_constraint_list_t *l)
1053 {
1054 return snd_pcm_hw_rule_add(runtime, cond, var,
1055 snd_pcm_hw_rule_list, l,
1056 var, -1);
1057 }
1058
1059 static int snd_pcm_hw_rule_ratnums(snd_pcm_hw_params_t *params,
1060 snd_pcm_hw_rule_t *rule)
1061 {
1062 snd_pcm_hw_constraint_ratnums_t *r = rule->private;
1063 unsigned int num = 0, den = 0;
1064 int err;
1065 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1066 r->nrats, r->rats, &num, &den);
1067 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1068 params->rate_num = num;
1069 params->rate_den = den;
1070 }
1071 return err;
1072 }
1073
1074 /**
1075 * snd_pcm_hw_constraint_ratnums
1076 * @runtime: PCM runtime instance
1077 * @cond: condition bits
1078 * @var: hw_params variable to apply the ratnums constraint
1079 * @r: ratnums_t constriants
1080 */
1081 int snd_pcm_hw_constraint_ratnums(snd_pcm_runtime_t *runtime,
1082 unsigned int cond,
1083 snd_pcm_hw_param_t var,
1084 snd_pcm_hw_constraint_ratnums_t *r)
1085 {
1086 return snd_pcm_hw_rule_add(runtime, cond, var,
1087 snd_pcm_hw_rule_ratnums, r,
1088 var, -1);
1089 }
1090
1091 static int snd_pcm_hw_rule_ratdens(snd_pcm_hw_params_t *params,
1092 snd_pcm_hw_rule_t *rule)
1093 {
1094 snd_pcm_hw_constraint_ratdens_t *r = rule->private;
1095 unsigned int num = 0, den = 0;
1096 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1097 r->nrats, r->rats, &num, &den);
1098 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1099 params->rate_num = num;
1100 params->rate_den = den;
1101 }
1102 return err;
1103 }
1104
1105 /**
1106 * snd_pcm_hw_constraint_ratdens
1107 * @runtime: PCM runtime instance
1108 * @cond: condition bits
1109 * @var: hw_params variable to apply the ratdens constraint
1110 * @r: ratdens_t constriants
1111 */
1112 int snd_pcm_hw_constraint_ratdens(snd_pcm_runtime_t *runtime,
1113 unsigned int cond,
1114 snd_pcm_hw_param_t var,
1115 snd_pcm_hw_constraint_ratdens_t *r)
1116 {
1117 return snd_pcm_hw_rule_add(runtime, cond, var,
1118 snd_pcm_hw_rule_ratdens, r,
1119 var, -1);
1120 }
1121
1122 static int snd_pcm_hw_rule_msbits(snd_pcm_hw_params_t *params,
1123 snd_pcm_hw_rule_t *rule)
1124 {
1125 unsigned int l = (unsigned long) rule->private;
1126 int width = l & 0xffff;
1127 unsigned int msbits = l >> 16;
1128 snd_interval_t *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1129 if (snd_interval_single(i) && snd_interval_value(i) == width)
1130 params->msbits = msbits;
1131 return 0;
1132 }
1133
1134 /**
1135 * snd_pcm_hw_constraint_msbits
1136 * @runtime: PCM runtime instance
1137 * @cond: condition bits
1138 * @width: sample bits width
1139 * @msbits: msbits width
1140 */
1141 int snd_pcm_hw_constraint_msbits(snd_pcm_runtime_t *runtime,
1142 unsigned int cond,
1143 unsigned int width,
1144 unsigned int msbits)
1145 {
1146 unsigned long l = (msbits << 16) | width;
1147 return snd_pcm_hw_rule_add(runtime, cond, -1,
1148 snd_pcm_hw_rule_msbits,
1149 (void*) l,
1150 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1151 }
1152
1153 static int snd_pcm_hw_rule_step(snd_pcm_hw_params_t *params,
1154 snd_pcm_hw_rule_t *rule)
1155 {
1156 unsigned long step = (unsigned long) rule->private;
1157 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1158 }
1159
1160 /**
1161 * snd_pcm_hw_constraint_step
1162 * @runtime: PCM runtime instance
1163 * @cond: condition bits
1164 * @var: hw_params variable to apply the step constraint
1165 * @step: step size
1166 */
1167 int snd_pcm_hw_constraint_step(snd_pcm_runtime_t *runtime,
1168 unsigned int cond,
1169 snd_pcm_hw_param_t var,
1170 unsigned long step)
1171 {
1172 return snd_pcm_hw_rule_add(runtime, cond, var,
1173 snd_pcm_hw_rule_step, (void *) step,
1174 var, -1);
1175 }
1176
1177 static int snd_pcm_hw_rule_pow2(snd_pcm_hw_params_t *params, snd_pcm_hw_rule_t *rule)
1178 {
1179 static int pow2_sizes[] = {
1180 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1181 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1182 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1183 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1184 };
1185 return snd_interval_list(hw_param_interval(params, rule->var),
1186 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1187 }
1188
1189 /**
1190 * snd_pcm_hw_constraint_pow2
1191 * @runtime: PCM runtime instance
1192 * @cond: condition bits
1193 * @var: hw_params variable to apply the power-of-2 constraint
1194 */
1195 int snd_pcm_hw_constraint_pow2(snd_pcm_runtime_t *runtime,
1196 unsigned int cond,
1197 snd_pcm_hw_param_t var)
1198 {
1199 return snd_pcm_hw_rule_add(runtime, cond, var,
1200 snd_pcm_hw_rule_pow2, NULL,
1201 var, -1);
1202 }
1203
1204 /* To use the same code we have in alsa-lib */
1205 #define snd_pcm_t snd_pcm_substream_t
1206 #define assert(i) snd_assert((i), return -EINVAL)
1207 #ifndef INT_MIN
1208 #define INT_MIN ((int)((unsigned int)INT_MAX+1))
1209 #endif
1210
1211 static void _snd_pcm_hw_param_any(snd_pcm_hw_params_t *params,
1212 snd_pcm_hw_param_t var)
1213 {
1214 if (hw_is_mask(var)) {
1215 snd_mask_any(hw_param_mask(params, var));
1216 params->cmask |= 1 << var;
1217 params->rmask |= 1 << var;
1218 return;
1219 }
1220 if (hw_is_interval(var)) {
1221 snd_interval_any(hw_param_interval(params, var));
1222 params->cmask |= 1 << var;
1223 params->rmask |= 1 << var;
1224 return;
1225 }
1226 snd_BUG();
1227 }
1228
1229 #if 0
1230 /*
1231 * snd_pcm_hw_param_any
1232 */
1233 int snd_pcm_hw_param_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1234 snd_pcm_hw_param_t var)
1235 {
1236 _snd_pcm_hw_param_any(params, var);
1237 return snd_pcm_hw_refine(pcm, params);
1238 }
1239 #endif /* 0 */
1240
1241 void _snd_pcm_hw_params_any(snd_pcm_hw_params_t *params)
1242 {
1243 unsigned int k;
1244 memset(params, 0, sizeof(*params));
1245 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1246 _snd_pcm_hw_param_any(params, k);
1247 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1248 _snd_pcm_hw_param_any(params, k);
1249 params->info = ~0U;
1250 }
1251
1252 #if 0
1253 /*
1254 * snd_pcm_hw_params_any
1255 *
1256 * Fill PARAMS with full configuration space boundaries
1257 */
1258 int snd_pcm_hw_params_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
1259 {
1260 _snd_pcm_hw_params_any(params);
1261 return snd_pcm_hw_refine(pcm, params);
1262 }
1263 #endif /* 0 */
1264
1265 /**
1266 * snd_pcm_hw_param_value
1267 * @params: the hw_params instance
1268 * @var: parameter to retrieve
1269 * @dir: pointer to the direction (-1,0,1) or NULL
1270 *
1271 * Return the value for field PAR if it's fixed in configuration space
1272 * defined by PARAMS. Return -EINVAL otherwise
1273 */
1274 static int snd_pcm_hw_param_value(const snd_pcm_hw_params_t *params,
1275 snd_pcm_hw_param_t var, int *dir)
1276 {
1277 if (hw_is_mask(var)) {
1278 const snd_mask_t *mask = hw_param_mask_c(params, var);
1279 if (!snd_mask_single(mask))
1280 return -EINVAL;
1281 if (dir)
1282 *dir = 0;
1283 return snd_mask_value(mask);
1284 }
1285 if (hw_is_interval(var)) {
1286 const snd_interval_t *i = hw_param_interval_c(params, var);
1287 if (!snd_interval_single(i))
1288 return -EINVAL;
1289 if (dir)
1290 *dir = i->openmin;
1291 return snd_interval_value(i);
1292 }
1293 assert(0);
1294 return -EINVAL;
1295 }
1296
1297 /**
1298 * snd_pcm_hw_param_value_min
1299 * @params: the hw_params instance
1300 * @var: parameter to retrieve
1301 * @dir: pointer to the direction (-1,0,1) or NULL
1302 *
1303 * Return the minimum value for field PAR.
1304 */
1305 unsigned int snd_pcm_hw_param_value_min(const snd_pcm_hw_params_t *params,
1306 snd_pcm_hw_param_t var, int *dir)
1307 {
1308 if (hw_is_mask(var)) {
1309 if (dir)
1310 *dir = 0;
1311 return snd_mask_min(hw_param_mask_c(params, var));
1312 }
1313 if (hw_is_interval(var)) {
1314 const snd_interval_t *i = hw_param_interval_c(params, var);
1315 if (dir)
1316 *dir = i->openmin;
1317 return snd_interval_min(i);
1318 }
1319 assert(0);
1320 return -EINVAL;
1321 }
1322
1323 /**
1324 * snd_pcm_hw_param_value_max
1325 * @params: the hw_params instance
1326 * @var: parameter to retrieve
1327 * @dir: pointer to the direction (-1,0,1) or NULL
1328 *
1329 * Return the maximum value for field PAR.
1330 */
1331 unsigned int snd_pcm_hw_param_value_max(const snd_pcm_hw_params_t *params,
1332 snd_pcm_hw_param_t var, int *dir)
1333 {
1334 if (hw_is_mask(var)) {
1335 if (dir)
1336 *dir = 0;
1337 return snd_mask_max(hw_param_mask_c(params, var));
1338 }
1339 if (hw_is_interval(var)) {
1340 const snd_interval_t *i = hw_param_interval_c(params, var);
1341 if (dir)
1342 *dir = - (int) i->openmax;
1343 return snd_interval_max(i);
1344 }
1345 assert(0);
1346 return -EINVAL;
1347 }
1348
1349 void _snd_pcm_hw_param_setempty(snd_pcm_hw_params_t *params,
1350 snd_pcm_hw_param_t var)
1351 {
1352 if (hw_is_mask(var)) {
1353 snd_mask_none(hw_param_mask(params, var));
1354 params->cmask |= 1 << var;
1355 params->rmask |= 1 << var;
1356 } else if (hw_is_interval(var)) {
1357 snd_interval_none(hw_param_interval(params, var));
1358 params->cmask |= 1 << var;
1359 params->rmask |= 1 << var;
1360 } else {
1361 snd_BUG();
1362 }
1363 }
1364
1365 int _snd_pcm_hw_param_setinteger(snd_pcm_hw_params_t *params,
1366 snd_pcm_hw_param_t var)
1367 {
1368 int changed;
1369 assert(hw_is_interval(var));
1370 changed = snd_interval_setinteger(hw_param_interval(params, var));
1371 if (changed) {
1372 params->cmask |= 1 << var;
1373 params->rmask |= 1 << var;
1374 }
1375 return changed;
1376 }
1377
1378 #if 0
1379 /*
1380 * snd_pcm_hw_param_setinteger
1381 *
1382 * Inside configuration space defined by PARAMS remove from PAR all
1383 * non integer values. Reduce configuration space accordingly.
1384 * Return -EINVAL if the configuration space is empty
1385 */
1386 int snd_pcm_hw_param_setinteger(snd_pcm_t *pcm,
1387 snd_pcm_hw_params_t *params,
1388 snd_pcm_hw_param_t var)
1389 {
1390 int changed = _snd_pcm_hw_param_setinteger(params, var);
1391 if (changed < 0)
1392 return changed;
1393 if (params->rmask) {
1394 int err = snd_pcm_hw_refine(pcm, params);
1395 if (err < 0)
1396 return err;
1397 }
1398 return 0;
1399 }
1400 #endif /* 0 */
1401
1402 static int _snd_pcm_hw_param_first(snd_pcm_hw_params_t *params,
1403 snd_pcm_hw_param_t var)
1404 {
1405 int changed;
1406 if (hw_is_mask(var))
1407 changed = snd_mask_refine_first(hw_param_mask(params, var));
1408 else if (hw_is_interval(var))
1409 changed = snd_interval_refine_first(hw_param_interval(params, var));
1410 else {
1411 assert(0);
1412 return -EINVAL;
1413 }
1414 if (changed) {
1415 params->cmask |= 1 << var;
1416 params->rmask |= 1 << var;
1417 }
1418 return changed;
1419 }
1420
1421
1422 /**
1423 * snd_pcm_hw_param_first
1424 * @pcm: PCM instance
1425 * @params: the hw_params instance
1426 * @var: parameter to retrieve
1427 * @dir: pointer to the direction (-1,0,1) or NULL
1428 *
1429 * Inside configuration space defined by PARAMS remove from PAR all
1430 * values > minimum. Reduce configuration space accordingly.
1431 * Return the minimum.
1432 */
1433 static int snd_pcm_hw_param_first(snd_pcm_t *pcm,
1434 snd_pcm_hw_params_t *params,
1435 snd_pcm_hw_param_t var, int *dir)
1436 {
1437 int changed = _snd_pcm_hw_param_first(params, var);
1438 if (changed < 0)
1439 return changed;
1440 if (params->rmask) {
1441 int err = snd_pcm_hw_refine(pcm, params);
1442 assert(err >= 0);
1443 }
1444 return snd_pcm_hw_param_value(params, var, dir);
1445 }
1446
1447 static int _snd_pcm_hw_param_last(snd_pcm_hw_params_t *params,
1448 snd_pcm_hw_param_t var)
1449 {
1450 int changed;
1451 if (hw_is_mask(var))
1452 changed = snd_mask_refine_last(hw_param_mask(params, var));
1453 else if (hw_is_interval(var))
1454 changed = snd_interval_refine_last(hw_param_interval(params, var));
1455 else {
1456 assert(0);
1457 return -EINVAL;
1458 }
1459 if (changed) {
1460 params->cmask |= 1 << var;
1461 params->rmask |= 1 << var;
1462 }
1463 return changed;
1464 }
1465
1466
1467 /**
1468 * snd_pcm_hw_param_last
1469 * @pcm: PCM instance
1470 * @params: the hw_params instance
1471 * @var: parameter to retrieve
1472 * @dir: pointer to the direction (-1,0,1) or NULL
1473 *
1474 * Inside configuration space defined by PARAMS remove from PAR all
1475 * values < maximum. Reduce configuration space accordingly.
1476 * Return the maximum.
1477 */
1478 static int snd_pcm_hw_param_last(snd_pcm_t *pcm,
1479 snd_pcm_hw_params_t *params,
1480 snd_pcm_hw_param_t var, int *dir)
1481 {
1482 int changed = _snd_pcm_hw_param_last(params, var);
1483 if (changed < 0)
1484 return changed;
1485 if (params->rmask) {
1486 int err = snd_pcm_hw_refine(pcm, params);
1487 assert(err >= 0);
1488 }
1489 return snd_pcm_hw_param_value(params, var, dir);
1490 }
1491
1492 int _snd_pcm_hw_param_min(snd_pcm_hw_params_t *params,
1493 snd_pcm_hw_param_t var, unsigned int val, int dir)
1494 {
1495 int changed;
1496 int open = 0;
1497 if (dir) {
1498 if (dir > 0) {
1499 open = 1;
1500 } else if (dir < 0) {
1501 if (val > 0) {
1502 open = 1;
1503 val--;
1504 }
1505 }
1506 }
1507 if (hw_is_mask(var))
1508 changed = snd_mask_refine_min(hw_param_mask(params, var), val + !!open);
1509 else if (hw_is_interval(var))
1510 changed = snd_interval_refine_min(hw_param_interval(params, var), val, open);
1511 else {
1512 assert(0);
1513 return -EINVAL;
1514 }
1515 if (changed) {
1516 params->cmask |= 1 << var;
1517 params->rmask |= 1 << var;
1518 }
1519 return changed;
1520 }
1521
1522 /**
1523 * snd_pcm_hw_param_min
1524 * @pcm: PCM instance
1525 * @params: the hw_params instance
1526 * @var: parameter to retrieve
1527 * @val: minimal value
1528 * @dir: pointer to the direction (-1,0,1) or NULL
1529 *
1530 * Inside configuration space defined by PARAMS remove from PAR all
1531 * values < VAL. Reduce configuration space accordingly.
1532 * Return new minimum or -EINVAL if the configuration space is empty
1533 */
1534 static int snd_pcm_hw_param_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1535 snd_pcm_hw_param_t var, unsigned int val,
1536 int *dir)
1537 {
1538 int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
1539 if (changed < 0)
1540 return changed;
1541 if (params->rmask) {
1542 int err = snd_pcm_hw_refine(pcm, params);
1543 if (err < 0)
1544 return err;
1545 }
1546 return snd_pcm_hw_param_value_min(params, var, dir);
1547 }
1548
1549 static int _snd_pcm_hw_param_max(snd_pcm_hw_params_t *params,
1550 snd_pcm_hw_param_t var, unsigned int val,
1551 int dir)
1552 {
1553 int changed;
1554 int open = 0;
1555 if (dir) {
1556 if (dir < 0) {
1557 open = 1;
1558 } else if (dir > 0) {
1559 open = 1;
1560 val++;
1561 }
1562 }
1563 if (hw_is_mask(var)) {
1564 if (val == 0 && open) {
1565 snd_mask_none(hw_param_mask(params, var));
1566 changed = -EINVAL;
1567 } else
1568 changed = snd_mask_refine_max(hw_param_mask(params, var), val - !!open);
1569 } else if (hw_is_interval(var))
1570 changed = snd_interval_refine_max(hw_param_interval(params, var), val, open);
1571 else {
1572 assert(0);
1573 return -EINVAL;
1574 }
1575 if (changed) {
1576 params->cmask |= 1 << var;
1577 params->rmask |= 1 << var;
1578 }
1579 return changed;
1580 }
1581
1582 /**
1583 * snd_pcm_hw_param_max
1584 * @pcm: PCM instance
1585 * @params: the hw_params instance
1586 * @var: parameter to retrieve
1587 * @val: maximal value
1588 * @dir: pointer to the direction (-1,0,1) or NULL
1589 *
1590 * Inside configuration space defined by PARAMS remove from PAR all
1591 * values >= VAL + 1. Reduce configuration space accordingly.
1592 * Return new maximum or -EINVAL if the configuration space is empty
1593 */
1594 static int snd_pcm_hw_param_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1595 snd_pcm_hw_param_t var, unsigned int val,
1596 int *dir)
1597 {
1598 int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
1599 if (changed < 0)
1600 return changed;
1601 if (params->rmask) {
1602 int err = snd_pcm_hw_refine(pcm, params);
1603 if (err < 0)
1604 return err;
1605 }
1606 return snd_pcm_hw_param_value_max(params, var, dir);
1607 }
1608
1609 int _snd_pcm_hw_param_set(snd_pcm_hw_params_t *params,
1610 snd_pcm_hw_param_t var, unsigned int val, int dir)
1611 {
1612 int changed;
1613 if (hw_is_mask(var)) {
1614 snd_mask_t *m = hw_param_mask(params, var);
1615 if (val == 0 && dir < 0) {
1616 changed = -EINVAL;
1617 snd_mask_none(m);
1618 } else {
1619 if (dir > 0)
1620 val++;
1621 else if (dir < 0)
1622 val--;
1623 changed = snd_mask_refine_set(hw_param_mask(params, var), val);
1624 }
1625 } else if (hw_is_interval(var)) {
1626 snd_interval_t *i = hw_param_interval(params, var);
1627 if (val == 0 && dir < 0) {
1628 changed = -EINVAL;
1629 snd_interval_none(i);
1630 } else if (dir == 0)
1631 changed = snd_interval_refine_set(i, val);
1632 else {
1633 snd_interval_t t;
1634 t.openmin = 1;
1635 t.openmax = 1;
1636 t.empty = 0;
1637 t.integer = 0;
1638 if (dir < 0) {
1639 t.min = val - 1;
1640 t.max = val;
1641 } else {
1642 t.min = val;
1643 t.max = val+1;
1644 }
1645 changed = snd_interval_refine(i, &t);
1646 }
1647 } else {
1648 assert(0);
1649 return -EINVAL;
1650 }
1651 if (changed) {
1652 params->cmask |= 1 << var;
1653 params->rmask |= 1 << var;
1654 }
1655 return changed;
1656 }
1657
1658 /**
1659 * snd_pcm_hw_param_set
1660 * @pcm: PCM instance
1661 * @params: the hw_params instance
1662 * @var: parameter to retrieve
1663 * @val: value to set
1664 * @dir: pointer to the direction (-1,0,1) or NULL
1665 *
1666 * Inside configuration space defined by PARAMS remove from PAR all
1667 * values != VAL. Reduce configuration space accordingly.
1668 * Return VAL or -EINVAL if the configuration space is empty
1669 */
1670 int snd_pcm_hw_param_set(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1671 snd_pcm_hw_param_t var, unsigned int val, int dir)
1672 {
1673 int changed = _snd_pcm_hw_param_set(params, var, val, dir);
1674 if (changed < 0)
1675 return changed;
1676 if (params->rmask) {
1677 int err = snd_pcm_hw_refine(pcm, params);
1678 if (err < 0)
1679 return err;
1680 }
1681 return snd_pcm_hw_param_value(params, var, NULL);
1682 }
1683
1684 static int _snd_pcm_hw_param_mask(snd_pcm_hw_params_t *params,
1685 snd_pcm_hw_param_t var, const snd_mask_t *val)
1686 {
1687 int changed;
1688 assert(hw_is_mask(var));
1689 changed = snd_mask_refine(hw_param_mask(params, var), val);
1690 if (changed) {
1691 params->cmask |= 1 << var;
1692 params->rmask |= 1 << var;
1693 }
1694 return changed;
1695 }
1696
1697 /**
1698 * snd_pcm_hw_param_mask
1699 * @pcm: PCM instance
1700 * @params: the hw_params instance
1701 * @var: parameter to retrieve
1702 * @val: mask to apply
1703 *
1704 * Inside configuration space defined by PARAMS remove from PAR all values
1705 * not contained in MASK. Reduce configuration space accordingly.
1706 * This function can be called only for SNDRV_PCM_HW_PARAM_ACCESS,
1707 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1708 * Return 0 on success or -EINVAL
1709 * if the configuration space is empty
1710 */
1711 int snd_pcm_hw_param_mask(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1712 snd_pcm_hw_param_t var, const snd_mask_t *val)
1713 {
1714 int changed = _snd_pcm_hw_param_mask(params, var, val);
1715 if (changed < 0)
1716 return changed;
1717 if (params->rmask) {
1718 int err = snd_pcm_hw_refine(pcm, params);
1719 if (err < 0)
1720 return err;
1721 }
1722 return 0;
1723 }
1724
1725 static int boundary_sub(int a, int adir,
1726 int b, int bdir,
1727 int *c, int *cdir)
1728 {
1729 adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
1730 bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
1731 *c = a - b;
1732 *cdir = adir - bdir;
1733 if (*cdir == -2) {
1734 assert(*c > INT_MIN);
1735 (*c)--;
1736 } else if (*cdir == 2) {
1737 assert(*c < INT_MAX);
1738 (*c)++;
1739 }
1740 return 0;
1741 }
1742
1743 static int boundary_lt(unsigned int a, int adir,
1744 unsigned int b, int bdir)
1745 {
1746 assert(a > 0 || adir >= 0);
1747 assert(b > 0 || bdir >= 0);
1748 if (adir < 0) {
1749 a--;
1750 adir = 1;
1751 } else if (adir > 0)
1752 adir = 1;
1753 if (bdir < 0) {
1754 b--;
1755 bdir = 1;
1756 } else if (bdir > 0)
1757 bdir = 1;
1758 return a < b || (a == b && adir < bdir);
1759 }
1760
1761 /* Return 1 if min is nearer to best than max */
1762 static int boundary_nearer(int min, int mindir,
1763 int best, int bestdir,
1764 int max, int maxdir)
1765 {
1766 int dmin, dmindir;
1767 int dmax, dmaxdir;
1768 boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
1769 boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
1770 return boundary_lt(dmin, dmindir, dmax, dmaxdir);
1771 }
1772
1773 /**
1774 * snd_pcm_hw_param_near
1775 * @pcm: PCM instance
1776 * @params: the hw_params instance
1777 * @var: parameter to retrieve
1778 * @best: value to set
1779 * @dir: pointer to the direction (-1,0,1) or NULL
1780 *
1781 * Inside configuration space defined by PARAMS set PAR to the available value
1782 * nearest to VAL. Reduce configuration space accordingly.
1783 * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
1784 * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
1785 * Return the value found.
1786 */
1787 int snd_pcm_hw_param_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
1788 snd_pcm_hw_param_t var, unsigned int best, int *dir)
1789 {
1790 snd_pcm_hw_params_t *save = NULL;
1791 int v;
1792 unsigned int saved_min;
1793 int last = 0;
1794 int min, max;
1795 int mindir, maxdir;
1796 int valdir = dir ? *dir : 0;
1797 /* FIXME */
1798 if (best > INT_MAX)
1799 best = INT_MAX;
1800 min = max = best;
1801 mindir = maxdir = valdir;
1802 if (maxdir > 0)
1803 maxdir = 0;
1804 else if (maxdir == 0)
1805 maxdir = -1;
1806 else {
1807 maxdir = 1;
1808 max--;
1809 }
1810 save = kmalloc(sizeof(*save), GFP_KERNEL);
1811 if (save == NULL)
1812 return -ENOMEM;
1813 *save = *params;
1814 saved_min = min;
1815 min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
1816 if (min >= 0) {
1817 snd_pcm_hw_params_t *params1;
1818 if (max < 0)
1819 goto _end;
1820 if ((unsigned int)min == saved_min && mindir == valdir)
1821 goto _end;
1822 params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
1823 if (params1 == NULL) {
1824 kfree(save);
1825 return -ENOMEM;
1826 }
1827 *params1 = *save;
1828 max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
1829 if (max < 0) {
1830 kfree(params1);
1831 goto _end;
1832 }
1833 if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
1834 *params = *params1;
1835 last = 1;
1836 }
1837 kfree(params1);
1838 } else {
1839 *params = *save;
1840 max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
1841 assert(max >= 0);
1842 last = 1;
1843 }
1844 _end:
1845 kfree(save);
1846 if (last)
1847 v = snd_pcm_hw_param_last(pcm, params, var, dir);
1848 else
1849 v = snd_pcm_hw_param_first(pcm, params, var, dir);
1850 assert(v >= 0);
1851 return v;
1852 }
1853
1854 /**
1855 * snd_pcm_hw_param_choose
1856 * @pcm: PCM instance
1857 * @params: the hw_params instance
1858 *
1859 * Choose one configuration from configuration space defined by PARAMS
1860 * The configuration chosen is that obtained fixing in this order:
1861 * first access, first format, first subformat, min channels,
1862 * min rate, min period time, max buffer size, min tick time
1863 */
1864 int snd_pcm_hw_params_choose(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
1865 {
1866 int err;
1867
1868 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_ACCESS, NULL);
1869 assert(err >= 0);
1870
1871 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_FORMAT, NULL);
1872 assert(err >= 0);
1873
1874 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_SUBFORMAT, NULL);
1875 assert(err >= 0);
1876
1877 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_CHANNELS, NULL);
1878 assert(err >= 0);
1879
1880 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_RATE, NULL);
1881 assert(err >= 0);
1882
1883 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_PERIOD_TIME, NULL);
1884 assert(err >= 0);
1885
1886 err = snd_pcm_hw_param_last(pcm, params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL);
1887 assert(err >= 0);
1888
1889 err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_TICK_TIME, NULL);
1890 assert(err >= 0);
1891
1892 return 0;
1893 }
1894
1895 #undef snd_pcm_t
1896 #undef assert
1897
1898 static int snd_pcm_lib_ioctl_reset(snd_pcm_substream_t *substream,
1899 void *arg)
1900 {
1901 snd_pcm_runtime_t *runtime = substream->runtime;
1902 unsigned long flags;
1903 snd_pcm_stream_lock_irqsave(substream, flags);
1904 if (snd_pcm_running(substream) &&
1905 snd_pcm_update_hw_ptr(substream) >= 0)
1906 runtime->status->hw_ptr %= runtime->buffer_size;
1907 else
1908 runtime->status->hw_ptr = 0;
1909 snd_pcm_stream_unlock_irqrestore(substream, flags);
1910 return 0;
1911 }
1912
1913 static int snd_pcm_lib_ioctl_channel_info(snd_pcm_substream_t *substream,
1914 void *arg)
1915 {
1916 snd_pcm_channel_info_t *info = arg;
1917 snd_pcm_runtime_t *runtime = substream->runtime;
1918 int width;
1919 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1920 info->offset = -1;
1921 return 0;
1922 }
1923 width = snd_pcm_format_physical_width(runtime->format);
1924 if (width < 0)
1925 return width;
1926 info->offset = 0;
1927 switch (runtime->access) {
1928 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1929 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1930 info->first = info->channel * width;
1931 info->step = runtime->channels * width;
1932 break;
1933 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1934 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1935 {
1936 size_t size = runtime->dma_bytes / runtime->channels;
1937 info->first = info->channel * size * 8;
1938 info->step = width;
1939 break;
1940 }
1941 default:
1942 snd_BUG();
1943 break;
1944 }
1945 return 0;
1946 }
1947
1948 /**
1949 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1950 * @substream: the pcm substream instance
1951 * @cmd: ioctl command
1952 * @arg: ioctl argument
1953 *
1954 * Processes the generic ioctl commands for PCM.
1955 * Can be passed as the ioctl callback for PCM ops.
1956 *
1957 * Returns zero if successful, or a negative error code on failure.
1958 */
1959 int snd_pcm_lib_ioctl(snd_pcm_substream_t *substream,
1960 unsigned int cmd, void *arg)
1961 {
1962 switch (cmd) {
1963 case SNDRV_PCM_IOCTL1_INFO:
1964 return 0;
1965 case SNDRV_PCM_IOCTL1_RESET:
1966 return snd_pcm_lib_ioctl_reset(substream, arg);
1967 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1968 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1969 }
1970 return -ENXIO;
1971 }
1972
1973 /*
1974 * Conditions
1975 */
1976
1977 static void snd_pcm_system_tick_set(snd_pcm_substream_t *substream,
1978 unsigned long ticks)
1979 {
1980 snd_pcm_runtime_t *runtime = substream->runtime;
1981 if (ticks == 0)
1982 del_timer(&runtime->tick_timer);
1983 else {
1984 ticks += (1000000 / HZ) - 1;
1985 ticks /= (1000000 / HZ);
1986 mod_timer(&runtime->tick_timer, jiffies + ticks);
1987 }
1988 }
1989
1990 /* Temporary alias */
1991 void snd_pcm_tick_set(snd_pcm_substream_t *substream, unsigned long ticks)
1992 {
1993 snd_pcm_system_tick_set(substream, ticks);
1994 }
1995
1996 void snd_pcm_tick_prepare(snd_pcm_substream_t *substream)
1997 {
1998 snd_pcm_runtime_t *runtime = substream->runtime;
1999 snd_pcm_uframes_t frames = ULONG_MAX;
2000 snd_pcm_uframes_t avail, dist;
2001 unsigned int ticks;
2002 u_int64_t n;
2003 u_int32_t r;
2004 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
2005 if (runtime->silence_size >= runtime->boundary) {
2006 frames = 1;
2007 } else if (runtime->silence_size > 0 &&
2008 runtime->silence_filled < runtime->buffer_size) {
2009 snd_pcm_sframes_t noise_dist;
2010 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
2011 snd_assert(noise_dist <= (snd_pcm_sframes_t)runtime->silence_threshold, );
2012 frames = noise_dist - runtime->silence_threshold;
2013 }
2014 avail = snd_pcm_playback_avail(runtime);
2015 } else {
2016 avail = snd_pcm_capture_avail(runtime);
2017 }
2018 if (avail < runtime->control->avail_min) {
2019 snd_pcm_sframes_t n = runtime->control->avail_min - avail;
2020 if (n > 0 && frames > (snd_pcm_uframes_t)n)
2021 frames = n;
2022 }
2023 if (avail < runtime->buffer_size) {
2024 snd_pcm_sframes_t n = runtime->buffer_size - avail;
2025 if (n > 0 && frames > (snd_pcm_uframes_t)n)
2026 frames = n;
2027 }
2028 if (frames == ULONG_MAX) {
2029 snd_pcm_tick_set(substream, 0);
2030 return;
2031 }
2032 dist = runtime->status->hw_ptr - runtime->hw_ptr_base;
2033 /* Distance to next interrupt */
2034 dist = runtime->period_size - dist % runtime->period_size;
2035 if (dist <= frames) {
2036 snd_pcm_tick_set(substream, 0);
2037 return;
2038 }
2039 /* the base time is us */
2040 n = frames;
2041 n *= 1000000;
2042 div64_32(&n, runtime->tick_time * runtime->rate, &r);
2043 ticks = n + (r > 0 ? 1 : 0);
2044 if (ticks < runtime->sleep_min)
2045 ticks = runtime->sleep_min;
2046 snd_pcm_tick_set(substream, (unsigned long) ticks);
2047 }
2048
2049 void snd_pcm_tick_elapsed(snd_pcm_substream_t *substream)
2050 {
2051 snd_pcm_runtime_t *runtime;
2052 unsigned long flags;
2053
2054 snd_assert(substream != NULL, return);
2055 runtime = substream->runtime;
2056 snd_assert(runtime != NULL, return);
2057
2058 snd_pcm_stream_lock_irqsave(substream, flags);
2059 if (!snd_pcm_running(substream) ||
2060 snd_pcm_update_hw_ptr(substream) < 0)
2061 goto _end;
2062 if (runtime->sleep_min)
2063 snd_pcm_tick_prepare(substream);
2064 _end:
2065 snd_pcm_stream_unlock_irqrestore(substream, flags);
2066 }
2067
2068 /**
2069 * snd_pcm_period_elapsed - update the pcm status for the next period
2070 * @substream: the pcm substream instance
2071 *
2072 * This function is called from the interrupt handler when the
2073 * PCM has processed the period size. It will update the current
2074 * pointer, set up the tick, wake up sleepers, etc.
2075 *
2076 * Even if more than one periods have elapsed since the last call, you
2077 * have to call this only once.
2078 */
2079 void snd_pcm_period_elapsed(snd_pcm_substream_t *substream)
2080 {
2081 snd_pcm_runtime_t *runtime;
2082 unsigned long flags;
2083
2084 snd_assert(substream != NULL, return);
2085 runtime = substream->runtime;
2086 snd_assert(runtime != NULL, return);
2087
2088 if (runtime->transfer_ack_begin)
2089 runtime->transfer_ack_begin(substream);
2090
2091 snd_pcm_stream_lock_irqsave(substream, flags);
2092 if (!snd_pcm_running(substream) ||
2093 snd_pcm_update_hw_ptr_interrupt(substream) < 0)
2094 goto _end;
2095
2096 if (substream->timer_running)
2097 snd_timer_interrupt(substream->timer, 1);
2098 if (runtime->sleep_min)
2099 snd_pcm_tick_prepare(substream);
2100 _end:
2101 snd_pcm_stream_unlock_irqrestore(substream, flags);
2102 if (runtime->transfer_ack_end)
2103 runtime->transfer_ack_end(substream);
2104 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
2105 }
2106
2107 static int snd_pcm_lib_write_transfer(snd_pcm_substream_t *substream,
2108 unsigned int hwoff,
2109 unsigned long data, unsigned int off,
2110 snd_pcm_uframes_t frames)
2111 {
2112 snd_pcm_runtime_t *runtime = substream->runtime;
2113 int err;
2114 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2115 if (substream->ops->copy) {
2116 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2117 return err;
2118 } else {
2119 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2120 snd_assert(runtime->dma_area, return -EFAULT);
2121 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
2122 return -EFAULT;
2123 }
2124 return 0;
2125 }
2126
2127 typedef int (*transfer_f)(snd_pcm_substream_t *substream, unsigned int hwoff,
2128 unsigned long data, unsigned int off,
2129 snd_pcm_uframes_t size);
2130
2131 static snd_pcm_sframes_t snd_pcm_lib_write1(snd_pcm_substream_t *substream,
2132 unsigned long data,
2133 snd_pcm_uframes_t size,
2134 int nonblock,
2135 transfer_f transfer)
2136 {
2137 snd_pcm_runtime_t *runtime = substream->runtime;
2138 snd_pcm_uframes_t xfer = 0;
2139 snd_pcm_uframes_t offset = 0;
2140 int err = 0;
2141
2142 if (size == 0)
2143 return 0;
2144 if (size > runtime->xfer_align)
2145 size -= size % runtime->xfer_align;
2146
2147 snd_pcm_stream_lock_irq(substream);
2148 switch (runtime->status->state) {
2149 case SNDRV_PCM_STATE_PREPARED:
2150 case SNDRV_PCM_STATE_RUNNING:
2151 case SNDRV_PCM_STATE_PAUSED:
2152 break;
2153 case SNDRV_PCM_STATE_XRUN:
2154 err = -EPIPE;
2155 goto _end_unlock;
2156 case SNDRV_PCM_STATE_SUSPENDED:
2157 err = -ESTRPIPE;
2158 goto _end_unlock;
2159 default:
2160 err = -EBADFD;
2161 goto _end_unlock;
2162 }
2163
2164 while (size > 0) {
2165 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2166 snd_pcm_uframes_t avail;
2167 snd_pcm_uframes_t cont;
2168 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2169 snd_pcm_update_hw_ptr(substream);
2170 avail = snd_pcm_playback_avail(runtime);
2171 if (((avail < runtime->control->avail_min && size > avail) ||
2172 (size >= runtime->xfer_align && avail < runtime->xfer_align))) {
2173 wait_queue_t wait;
2174 enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
2175 long tout;
2176
2177 if (nonblock) {
2178 err = -EAGAIN;
2179 goto _end_unlock;
2180 }
2181
2182 init_waitqueue_entry(&wait, current);
2183 add_wait_queue(&runtime->sleep, &wait);
2184 while (1) {
2185 if (signal_pending(current)) {
2186 state = SIGNALED;
2187 break;
2188 }
2189 set_current_state(TASK_INTERRUPTIBLE);
2190 snd_pcm_stream_unlock_irq(substream);
2191 tout = schedule_timeout(10 * HZ);
2192 snd_pcm_stream_lock_irq(substream);
2193 if (tout == 0) {
2194 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2195 runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2196 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2197 break;
2198 }
2199 }
2200 switch (runtime->status->state) {
2201 case SNDRV_PCM_STATE_XRUN:
2202 case SNDRV_PCM_STATE_DRAINING:
2203 state = ERROR;
2204 goto _end_loop;
2205 case SNDRV_PCM_STATE_SUSPENDED:
2206 state = SUSPENDED;
2207 goto _end_loop;
2208 case SNDRV_PCM_STATE_SETUP:
2209 state = DROPPED;
2210 goto _end_loop;
2211 default:
2212 break;
2213 }
2214 avail = snd_pcm_playback_avail(runtime);
2215 if (avail >= runtime->control->avail_min) {
2216 state = READY;
2217 break;
2218 }
2219 }
2220 _end_loop:
2221 remove_wait_queue(&runtime->sleep, &wait);
2222
2223 switch (state) {
2224 case ERROR:
2225 err = -EPIPE;
2226 goto _end_unlock;
2227 case SUSPENDED:
2228 err = -ESTRPIPE;
2229 goto _end_unlock;
2230 case SIGNALED:
2231 err = -ERESTARTSYS;
2232 goto _end_unlock;
2233 case EXPIRED:
2234 snd_printd("playback write error (DMA or IRQ trouble?)\n");
2235 err = -EIO;
2236 goto _end_unlock;
2237 case DROPPED:
2238 err = -EBADFD;
2239 goto _end_unlock;
2240 default:
2241 break;
2242 }
2243 }
2244 if (avail > runtime->xfer_align)
2245 avail -= avail % runtime->xfer_align;
2246 frames = size > avail ? avail : size;
2247 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2248 if (frames > cont)
2249 frames = cont;
2250 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2251 appl_ptr = runtime->control->appl_ptr;
2252 appl_ofs = appl_ptr % runtime->buffer_size;
2253 snd_pcm_stream_unlock_irq(substream);
2254 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2255 goto _end;
2256 snd_pcm_stream_lock_irq(substream);
2257 switch (runtime->status->state) {
2258 case SNDRV_PCM_STATE_XRUN:
2259 err = -EPIPE;
2260 goto _end_unlock;
2261 case SNDRV_PCM_STATE_SUSPENDED:
2262 err = -ESTRPIPE;
2263 goto _end_unlock;
2264 default:
2265 break;
2266 }
2267 appl_ptr += frames;
2268 if (appl_ptr >= runtime->boundary)
2269 appl_ptr -= runtime->boundary;
2270 runtime->control->appl_ptr = appl_ptr;
2271 if (substream->ops->ack)
2272 substream->ops->ack(substream);
2273
2274 offset += frames;
2275 size -= frames;
2276 xfer += frames;
2277 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
2278 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
2279 err = snd_pcm_start(substream);
2280 if (err < 0)
2281 goto _end_unlock;
2282 }
2283 if (runtime->sleep_min &&
2284 runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2285 snd_pcm_tick_prepare(substream);
2286 }
2287 _end_unlock:
2288 snd_pcm_stream_unlock_irq(substream);
2289 _end:
2290 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2291 }
2292
2293 snd_pcm_sframes_t snd_pcm_lib_write(snd_pcm_substream_t *substream, const void __user *buf, snd_pcm_uframes_t size)
2294 {
2295 snd_pcm_runtime_t *runtime;
2296 int nonblock;
2297
2298 snd_assert(substream != NULL, return -ENXIO);
2299 runtime = substream->runtime;
2300 snd_assert(runtime != NULL, return -ENXIO);
2301 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2302 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2303 return -EBADFD;
2304
2305 snd_assert(substream->ffile != NULL, return -ENXIO);
2306 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2307 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2308 if (substream->oss.oss) {
2309 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2310 if (setup != NULL) {
2311 if (setup->nonblock)
2312 nonblock = 1;
2313 else if (setup->block)
2314 nonblock = 0;
2315 }
2316 }
2317 #endif
2318
2319 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
2320 runtime->channels > 1)
2321 return -EINVAL;
2322 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
2323 snd_pcm_lib_write_transfer);
2324 }
2325
2326 static int snd_pcm_lib_writev_transfer(snd_pcm_substream_t *substream,
2327 unsigned int hwoff,
2328 unsigned long data, unsigned int off,
2329 snd_pcm_uframes_t frames)
2330 {
2331 snd_pcm_runtime_t *runtime = substream->runtime;
2332 int err;
2333 void __user **bufs = (void __user **)data;
2334 int channels = runtime->channels;
2335 int c;
2336 if (substream->ops->copy) {
2337 snd_assert(substream->ops->silence != NULL, return -EINVAL);
2338 for (c = 0; c < channels; ++c, ++bufs) {
2339 if (*bufs == NULL) {
2340 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
2341 return err;
2342 } else {
2343 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2344 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2345 return err;
2346 }
2347 }
2348 } else {
2349 /* default transfer behaviour */
2350 size_t dma_csize = runtime->dma_bytes / channels;
2351 snd_assert(runtime->dma_area, return -EFAULT);
2352 for (c = 0; c < channels; ++c, ++bufs) {
2353 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2354 if (*bufs == NULL) {
2355 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
2356 } else {
2357 char __user *buf = *bufs + samples_to_bytes(runtime, off);
2358 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
2359 return -EFAULT;
2360 }
2361 }
2362 }
2363 return 0;
2364 }
2365
2366 snd_pcm_sframes_t snd_pcm_lib_writev(snd_pcm_substream_t *substream,
2367 void __user **bufs,
2368 snd_pcm_uframes_t frames)
2369 {
2370 snd_pcm_runtime_t *runtime;
2371 int nonblock;
2372
2373 snd_assert(substream != NULL, return -ENXIO);
2374 runtime = substream->runtime;
2375 snd_assert(runtime != NULL, return -ENXIO);
2376 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2377 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2378 return -EBADFD;
2379
2380 snd_assert(substream->ffile != NULL, return -ENXIO);
2381 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2382 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2383 if (substream->oss.oss) {
2384 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2385 if (setup != NULL) {
2386 if (setup->nonblock)
2387 nonblock = 1;
2388 else if (setup->block)
2389 nonblock = 0;
2390 }
2391 }
2392 #endif
2393
2394 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2395 return -EINVAL;
2396 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
2397 nonblock, snd_pcm_lib_writev_transfer);
2398 }
2399
2400 static int snd_pcm_lib_read_transfer(snd_pcm_substream_t *substream,
2401 unsigned int hwoff,
2402 unsigned long data, unsigned int off,
2403 snd_pcm_uframes_t frames)
2404 {
2405 snd_pcm_runtime_t *runtime = substream->runtime;
2406 int err;
2407 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
2408 if (substream->ops->copy) {
2409 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
2410 return err;
2411 } else {
2412 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
2413 snd_assert(runtime->dma_area, return -EFAULT);
2414 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
2415 return -EFAULT;
2416 }
2417 return 0;
2418 }
2419
2420 static snd_pcm_sframes_t snd_pcm_lib_read1(snd_pcm_substream_t *substream,
2421 unsigned long data,
2422 snd_pcm_uframes_t size,
2423 int nonblock,
2424 transfer_f transfer)
2425 {
2426 snd_pcm_runtime_t *runtime = substream->runtime;
2427 snd_pcm_uframes_t xfer = 0;
2428 snd_pcm_uframes_t offset = 0;
2429 int err = 0;
2430
2431 if (size == 0)
2432 return 0;
2433 if (size > runtime->xfer_align)
2434 size -= size % runtime->xfer_align;
2435
2436 snd_pcm_stream_lock_irq(substream);
2437 switch (runtime->status->state) {
2438 case SNDRV_PCM_STATE_PREPARED:
2439 if (size >= runtime->start_threshold) {
2440 err = snd_pcm_start(substream);
2441 if (err < 0)
2442 goto _end_unlock;
2443 }
2444 break;
2445 case SNDRV_PCM_STATE_DRAINING:
2446 case SNDRV_PCM_STATE_RUNNING:
2447 case SNDRV_PCM_STATE_PAUSED:
2448 break;
2449 case SNDRV_PCM_STATE_XRUN:
2450 err = -EPIPE;
2451 goto _end_unlock;
2452 case SNDRV_PCM_STATE_SUSPENDED:
2453 err = -ESTRPIPE;
2454 goto _end_unlock;
2455 default:
2456 err = -EBADFD;
2457 goto _end_unlock;
2458 }
2459
2460 while (size > 0) {
2461 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2462 snd_pcm_uframes_t avail;
2463 snd_pcm_uframes_t cont;
2464 if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2465 snd_pcm_update_hw_ptr(substream);
2466 __draining:
2467 avail = snd_pcm_capture_avail(runtime);
2468 if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
2469 if (avail < runtime->xfer_align) {
2470 err = -EPIPE;
2471 goto _end_unlock;
2472 }
2473 } else if ((avail < runtime->control->avail_min && size > avail) ||
2474 (size >= runtime->xfer_align && avail < runtime->xfer_align)) {
2475 wait_queue_t wait;
2476 enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state;
2477 long tout;
2478
2479 if (nonblock) {
2480 err = -EAGAIN;
2481 goto _end_unlock;
2482 }
2483
2484 init_waitqueue_entry(&wait, current);
2485 add_wait_queue(&runtime->sleep, &wait);
2486 while (1) {
2487 if (signal_pending(current)) {
2488 state = SIGNALED;
2489 break;
2490 }
2491 set_current_state(TASK_INTERRUPTIBLE);
2492 snd_pcm_stream_unlock_irq(substream);
2493 tout = schedule_timeout(10 * HZ);
2494 snd_pcm_stream_lock_irq(substream);
2495 if (tout == 0) {
2496 if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
2497 runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
2498 state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
2499 break;
2500 }
2501 }
2502 switch (runtime->status->state) {
2503 case SNDRV_PCM_STATE_XRUN:
2504 state = ERROR;
2505 goto _end_loop;
2506 case SNDRV_PCM_STATE_SUSPENDED:
2507 state = SUSPENDED;
2508 goto _end_loop;
2509 case SNDRV_PCM_STATE_DRAINING:
2510 goto __draining;
2511 case SNDRV_PCM_STATE_SETUP:
2512 state = DROPPED;
2513 goto _end_loop;
2514 default:
2515 break;
2516 }
2517 avail = snd_pcm_capture_avail(runtime);
2518 if (avail >= runtime->control->avail_min) {
2519 state = READY;
2520 break;
2521 }
2522 }
2523 _end_loop:
2524 remove_wait_queue(&runtime->sleep, &wait);
2525
2526 switch (state) {
2527 case ERROR:
2528 err = -EPIPE;
2529 goto _end_unlock;
2530 case SUSPENDED:
2531 err = -ESTRPIPE;
2532 goto _end_unlock;
2533 case SIGNALED:
2534 err = -ERESTARTSYS;
2535 goto _end_unlock;
2536 case EXPIRED:
2537 snd_printd("capture read error (DMA or IRQ trouble?)\n");
2538 err = -EIO;
2539 goto _end_unlock;
2540 case DROPPED:
2541 err = -EBADFD;
2542 goto _end_unlock;
2543 default:
2544 break;
2545 }
2546 }
2547 if (avail > runtime->xfer_align)
2548 avail -= avail % runtime->xfer_align;
2549 frames = size > avail ? avail : size;
2550 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2551 if (frames > cont)
2552 frames = cont;
2553 snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
2554 appl_ptr = runtime->control->appl_ptr;
2555 appl_ofs = appl_ptr % runtime->buffer_size;
2556 snd_pcm_stream_unlock_irq(substream);
2557 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2558 goto _end;
2559 snd_pcm_stream_lock_irq(substream);
2560 switch (runtime->status->state) {
2561 case SNDRV_PCM_STATE_XRUN:
2562 err = -EPIPE;
2563 goto _end_unlock;
2564 case SNDRV_PCM_STATE_SUSPENDED:
2565 err = -ESTRPIPE;
2566 goto _end_unlock;
2567 default:
2568 break;
2569 }
2570 appl_ptr += frames;
2571 if (appl_ptr >= runtime->boundary)
2572 appl_ptr -= runtime->boundary;
2573 runtime->control->appl_ptr = appl_ptr;
2574 if (substream->ops->ack)
2575 substream->ops->ack(substream);
2576
2577 offset += frames;
2578 size -= frames;
2579 xfer += frames;
2580 if (runtime->sleep_min &&
2581 runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2582 snd_pcm_tick_prepare(substream);
2583 }
2584 _end_unlock:
2585 snd_pcm_stream_unlock_irq(substream);
2586 _end:
2587 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2588 }
2589
2590 snd_pcm_sframes_t snd_pcm_lib_read(snd_pcm_substream_t *substream, void __user *buf, snd_pcm_uframes_t size)
2591 {
2592 snd_pcm_runtime_t *runtime;
2593 int nonblock;
2594
2595 snd_assert(substream != NULL, return -ENXIO);
2596 runtime = substream->runtime;
2597 snd_assert(runtime != NULL, return -ENXIO);
2598 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2599 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2600 return -EBADFD;
2601
2602 snd_assert(substream->ffile != NULL, return -ENXIO);
2603 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2604 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2605 if (substream->oss.oss) {
2606 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2607 if (setup != NULL) {
2608 if (setup->nonblock)
2609 nonblock = 1;
2610 else if (setup->block)
2611 nonblock = 0;
2612 }
2613 }
2614 #endif
2615 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2616 return -EINVAL;
2617 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2618 }
2619
2620 static int snd_pcm_lib_readv_transfer(snd_pcm_substream_t *substream,
2621 unsigned int hwoff,
2622 unsigned long data, unsigned int off,
2623 snd_pcm_uframes_t frames)
2624 {
2625 snd_pcm_runtime_t *runtime = substream->runtime;
2626 int err;
2627 void __user **bufs = (void __user **)data;
2628 int channels = runtime->channels;
2629 int c;
2630 if (substream->ops->copy) {
2631 for (c = 0; c < channels; ++c, ++bufs) {
2632 char __user *buf;
2633 if (*bufs == NULL)
2634 continue;
2635 buf = *bufs + samples_to_bytes(runtime, off);
2636 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2637 return err;
2638 }
2639 } else {
2640 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2641 snd_assert(runtime->dma_area, return -EFAULT);
2642 for (c = 0; c < channels; ++c, ++bufs) {
2643 char *hwbuf;
2644 char __user *buf;
2645 if (*bufs == NULL)
2646 continue;
2647
2648 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2649 buf = *bufs + samples_to_bytes(runtime, off);
2650 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2651 return -EFAULT;
2652 }
2653 }
2654 return 0;
2655 }
2656
2657 snd_pcm_sframes_t snd_pcm_lib_readv(snd_pcm_substream_t *substream,
2658 void __user **bufs,
2659 snd_pcm_uframes_t frames)
2660 {
2661 snd_pcm_runtime_t *runtime;
2662 int nonblock;
2663
2664 snd_assert(substream != NULL, return -ENXIO);
2665 runtime = substream->runtime;
2666 snd_assert(runtime != NULL, return -ENXIO);
2667 snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
2668 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2669 return -EBADFD;
2670
2671 snd_assert(substream->ffile != NULL, return -ENXIO);
2672 nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
2673 #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
2674 if (substream->oss.oss) {
2675 snd_pcm_oss_setup_t *setup = substream->oss.setup;
2676 if (setup != NULL) {
2677 if (setup->nonblock)
2678 nonblock = 1;
2679 else if (setup->block)
2680 nonblock = 0;
2681 }
2682 }
2683 #endif
2684
2685 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2686 return -EINVAL;
2687 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2688 }
2689
2690 /*
2691 * Exported symbols
2692 */
2693
2694 EXPORT_SYMBOL(snd_interval_refine);
2695 EXPORT_SYMBOL(snd_interval_list);
2696 EXPORT_SYMBOL(snd_interval_ratnum);
2697 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
2698 EXPORT_SYMBOL(_snd_pcm_hw_param_min);
2699 EXPORT_SYMBOL(_snd_pcm_hw_param_set);
2700 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
2701 EXPORT_SYMBOL(_snd_pcm_hw_param_setinteger);
2702 EXPORT_SYMBOL(snd_pcm_hw_param_value_min);
2703 EXPORT_SYMBOL(snd_pcm_hw_param_value_max);
2704 EXPORT_SYMBOL(snd_pcm_hw_param_mask);
2705 EXPORT_SYMBOL(snd_pcm_hw_param_first);
2706 EXPORT_SYMBOL(snd_pcm_hw_param_last);
2707 EXPORT_SYMBOL(snd_pcm_hw_param_near);
2708 EXPORT_SYMBOL(snd_pcm_hw_param_set);
2709 EXPORT_SYMBOL(snd_pcm_hw_refine);
2710 EXPORT_SYMBOL(snd_pcm_hw_constraints_init);
2711 EXPORT_SYMBOL(snd_pcm_hw_constraints_complete);
2712 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
2713 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
2714 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
2715 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
2716 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
2717 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
2718 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
2719 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
2720 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
2721 EXPORT_SYMBOL(snd_pcm_set_ops);
2722 EXPORT_SYMBOL(snd_pcm_set_sync);
2723 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
2724 EXPORT_SYMBOL(snd_pcm_stop);
2725 EXPORT_SYMBOL(snd_pcm_period_elapsed);
2726 EXPORT_SYMBOL(snd_pcm_lib_write);
2727 EXPORT_SYMBOL(snd_pcm_lib_read);
2728 EXPORT_SYMBOL(snd_pcm_lib_writev);
2729 EXPORT_SYMBOL(snd_pcm_lib_readv);
2730 EXPORT_SYMBOL(snd_pcm_lib_buffer_bytes);
2731 EXPORT_SYMBOL(snd_pcm_lib_period_bytes);
2732 /* pcm_memory.c */
2733 EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
2734 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages);
2735 EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all);
2736 EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
2737 EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
2738 EXPORT_SYMBOL(snd_pcm_lib_free_pages);
Support for the Chinese Samsung S3C2440 based development boards