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mm_for_maps: take ->cred_guard_mutex to fix the race with exec
[linux-2.6/mini2440.git] / sound / core / pcm_lib.c
blob72cfd47af6b8b4196ba6a77d52002e3a52ab9e18
1 /*
2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Abramo Bagnara <abramo@alsa-project.org>
5 *
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 *
21 */
22
23 #include <linux/slab.h>
24 #include <linux/time.h>
25 #include <linux/math64.h>
26 #include <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(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
43 {
44 struct snd_pcm_runtime *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 noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
62 if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
63 return;
64 frames = runtime->silence_threshold - noise_dist;
65 if (frames > runtime->silence_size)
66 frames = runtime->silence_size;
67 } else {
68 if (new_hw_ptr == ULONG_MAX) { /* initialization */
69 snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
70 runtime->silence_filled = avail > 0 ? avail : 0;
71 runtime->silence_start = (runtime->status->hw_ptr +
72 runtime->silence_filled) %
73 runtime->boundary;
74 } else {
75 ofs = runtime->status->hw_ptr;
76 frames = new_hw_ptr - ofs;
77 if ((snd_pcm_sframes_t)frames < 0)
78 frames += runtime->boundary;
79 runtime->silence_filled -= frames;
80 if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
81 runtime->silence_filled = 0;
82 runtime->silence_start = new_hw_ptr;
83 } else {
84 runtime->silence_start = ofs;
85 }
86 }
87 frames = runtime->buffer_size - runtime->silence_filled;
88 }
89 if (snd_BUG_ON(frames > runtime->buffer_size))
90 return;
91 if (frames == 0)
92 return;
93 ofs = runtime->silence_start % runtime->buffer_size;
94 while (frames > 0) {
95 transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
96 if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
97 runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
98 if (substream->ops->silence) {
99 int err;
100 err = substream->ops->silence(substream, -1, ofs, transfer);
101 snd_BUG_ON(err < 0);
102 } else {
103 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
104 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
105 }
106 } else {
107 unsigned int c;
108 unsigned int channels = runtime->channels;
109 if (substream->ops->silence) {
110 for (c = 0; c < channels; ++c) {
111 int err;
112 err = substream->ops->silence(substream, c, ofs, transfer);
113 snd_BUG_ON(err < 0);
114 }
115 } else {
116 size_t dma_csize = runtime->dma_bytes / channels;
117 for (c = 0; c < channels; ++c) {
118 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
119 snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
120 }
121 }
122 }
123 runtime->silence_filled += transfer;
124 frames -= transfer;
125 ofs = 0;
126 }
127 }
128
129 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
130 #define xrun_debug(substream, mask) ((substream)->pstr->xrun_debug & (mask))
131 #else
132 #define xrun_debug(substream, mask) 0
133 #endif
134
135 #define dump_stack_on_xrun(substream) do { \
136 if (xrun_debug(substream, 2)) \
137 dump_stack(); \
138 } while (0)
139
140 static void pcm_debug_name(struct snd_pcm_substream *substream,
141 char *name, size_t len)
142 {
143 snprintf(name, len, "pcmC%dD%d%c:%d",
144 substream->pcm->card->number,
145 substream->pcm->device,
146 substream->stream ? 'c' : 'p',
147 substream->number);
148 }
149
150 static void xrun(struct snd_pcm_substream *substream)
151 {
152 struct snd_pcm_runtime *runtime = substream->runtime;
153
154 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
155 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
156 snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
157 if (xrun_debug(substream, 1)) {
158 char name[16];
159 pcm_debug_name(substream, name, sizeof(name));
160 snd_printd(KERN_DEBUG "XRUN: %s\n", name);
161 dump_stack_on_xrun(substream);
162 }
163 }
164
165 static snd_pcm_uframes_t
166 snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream *substream,
167 struct snd_pcm_runtime *runtime)
168 {
169 snd_pcm_uframes_t pos;
170
171 pos = substream->ops->pointer(substream);
172 if (pos == SNDRV_PCM_POS_XRUN)
173 return pos; /* XRUN */
174 if (pos >= runtime->buffer_size) {
175 if (printk_ratelimit()) {
176 char name[16];
177 pcm_debug_name(substream, name, sizeof(name));
178 snd_printd(KERN_ERR "BUG: %s, pos = 0x%lx, "
179 "buffer size = 0x%lx, period size = 0x%lx\n",
180 name, pos, runtime->buffer_size,
181 runtime->period_size);
182 }
183 pos = 0;
184 }
185 pos -= pos % runtime->min_align;
186 return pos;
187 }
188
189 static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream *substream,
190 struct snd_pcm_runtime *runtime)
191 {
192 snd_pcm_uframes_t avail;
193
194 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
195 avail = snd_pcm_playback_avail(runtime);
196 else
197 avail = snd_pcm_capture_avail(runtime);
198 if (avail > runtime->avail_max)
199 runtime->avail_max = avail;
200 if (avail >= runtime->stop_threshold) {
201 if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
202 snd_pcm_drain_done(substream);
203 else
204 xrun(substream);
205 return -EPIPE;
206 }
207 if (avail >= runtime->control->avail_min)
208 wake_up(&runtime->sleep);
209 return 0;
210 }
211
212 #define hw_ptr_error(substream, fmt, args...) \
213 do { \
214 if (xrun_debug(substream, 1)) { \
215 if (printk_ratelimit()) { \
216 snd_printd("PCM: " fmt, ##args); \
217 } \
218 dump_stack_on_xrun(substream); \
219 } \
220 } while (0)
221
222 static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream *substream)
223 {
224 struct snd_pcm_runtime *runtime = substream->runtime;
225 snd_pcm_uframes_t pos;
226 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_ptr_interrupt, hw_base;
227 snd_pcm_sframes_t hdelta, delta;
228 unsigned long jdelta;
229
230 old_hw_ptr = runtime->status->hw_ptr;
231 pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
232 if (pos == SNDRV_PCM_POS_XRUN) {
233 xrun(substream);
234 return -EPIPE;
235 }
236 if (xrun_debug(substream, 8)) {
237 char name[16];
238 pcm_debug_name(substream, name, sizeof(name));
239 snd_printd("period_update: %s: pos=0x%x/0x%x/0x%x, "
240 "hwptr=0x%lx, hw_base=0x%lx, hw_intr=0x%lx\n",
241 name, (unsigned int)pos,
242 (unsigned int)runtime->period_size,
243 (unsigned int)runtime->buffer_size,
244 (unsigned long)old_hw_ptr,
245 (unsigned long)runtime->hw_ptr_base,
246 (unsigned long)runtime->hw_ptr_interrupt);
247 }
248 hw_base = runtime->hw_ptr_base;
249 new_hw_ptr = hw_base + pos;
250 hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
251 delta = new_hw_ptr - hw_ptr_interrupt;
252 if (hw_ptr_interrupt >= runtime->boundary) {
253 hw_ptr_interrupt -= runtime->boundary;
254 if (hw_base < runtime->boundary / 2)
255 /* hw_base was already lapped; recalc delta */
256 delta = new_hw_ptr - hw_ptr_interrupt;
257 }
258 if (delta < 0) {
259 if (runtime->periods == 1 || new_hw_ptr < old_hw_ptr)
260 delta += runtime->buffer_size;
261 if (delta < 0) {
262 hw_ptr_error(substream,
263 "Unexpected hw_pointer value "
264 "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
265 substream->stream, (long)pos,
266 (long)hw_ptr_interrupt);
267 #if 1
268 /* simply skipping the hwptr update seems more
269 * robust in some cases, e.g. on VMware with
270 * inaccurate timer source
271 */
272 return 0; /* skip this update */
273 #else
274 /* rebase to interrupt position */
275 hw_base = new_hw_ptr = hw_ptr_interrupt;
276 /* align hw_base to buffer_size */
277 hw_base -= hw_base % runtime->buffer_size;
278 delta = 0;
279 #endif
280 } else {
281 hw_base += runtime->buffer_size;
282 if (hw_base >= runtime->boundary)
283 hw_base = 0;
284 new_hw_ptr = hw_base + pos;
285 }
286 }
287
288 /* Do jiffies check only in xrun_debug mode */
289 if (!xrun_debug(substream, 4))
290 goto no_jiffies_check;
291
292 /* Skip the jiffies check for hardwares with BATCH flag.
293 * Such hardware usually just increases the position at each IRQ,
294 * thus it can't give any strange position.
295 */
296 if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
297 goto no_jiffies_check;
298 hdelta = new_hw_ptr - old_hw_ptr;
299 if (hdelta < runtime->delay)
300 goto no_jiffies_check;
301 hdelta -= runtime->delay;
302 jdelta = jiffies - runtime->hw_ptr_jiffies;
303 if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
304 delta = jdelta /
305 (((runtime->period_size * HZ) / runtime->rate)
306 + HZ/100);
307 hw_ptr_error(substream,
308 "hw_ptr skipping! [Q] "
309 "(pos=%ld, delta=%ld, period=%ld, "
310 "jdelta=%lu/%lu/%lu)\n",
311 (long)pos, (long)hdelta,
312 (long)runtime->period_size, jdelta,
313 ((hdelta * HZ) / runtime->rate), delta);
314 hw_ptr_interrupt = runtime->hw_ptr_interrupt +
315 runtime->period_size * delta;
316 if (hw_ptr_interrupt >= runtime->boundary)
317 hw_ptr_interrupt -= runtime->boundary;
318 /* rebase to interrupt position */
319 hw_base = new_hw_ptr = hw_ptr_interrupt;
320 /* align hw_base to buffer_size */
321 hw_base -= hw_base % runtime->buffer_size;
322 delta = 0;
323 }
324 no_jiffies_check:
325 if (delta > runtime->period_size + runtime->period_size / 2) {
326 hw_ptr_error(substream,
327 "Lost interrupts? "
328 "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
329 substream->stream, (long)delta,
330 (long)hw_ptr_interrupt);
331 /* rebase hw_ptr_interrupt */
332 hw_ptr_interrupt =
333 new_hw_ptr - new_hw_ptr % runtime->period_size;
334 }
335 runtime->hw_ptr_interrupt = hw_ptr_interrupt;
336
337 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
338 runtime->silence_size > 0)
339 snd_pcm_playback_silence(substream, new_hw_ptr);
340
341 if (runtime->status->hw_ptr == new_hw_ptr)
342 return 0;
343
344 runtime->hw_ptr_base = hw_base;
345 runtime->status->hw_ptr = new_hw_ptr;
346 runtime->hw_ptr_jiffies = jiffies;
347 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
348 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
349
350 return snd_pcm_update_hw_ptr_post(substream, runtime);
351 }
352
353 /* CAUTION: call it with irq disabled */
354 int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
355 {
356 struct snd_pcm_runtime *runtime = substream->runtime;
357 snd_pcm_uframes_t pos;
358 snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
359 snd_pcm_sframes_t delta;
360 unsigned long jdelta;
361
362 old_hw_ptr = runtime->status->hw_ptr;
363 pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
364 if (pos == SNDRV_PCM_POS_XRUN) {
365 xrun(substream);
366 return -EPIPE;
367 }
368 if (xrun_debug(substream, 16)) {
369 char name[16];
370 pcm_debug_name(substream, name, sizeof(name));
371 snd_printd("hw_update: %s: pos=0x%x/0x%x/0x%x, "
372 "hwptr=0x%lx, hw_base=0x%lx, hw_intr=0x%lx\n",
373 name, (unsigned int)pos,
374 (unsigned int)runtime->period_size,
375 (unsigned int)runtime->buffer_size,
376 (unsigned long)old_hw_ptr,
377 (unsigned long)runtime->hw_ptr_base,
378 (unsigned long)runtime->hw_ptr_interrupt);
379 }
380
381 hw_base = runtime->hw_ptr_base;
382 new_hw_ptr = hw_base + pos;
383
384 delta = new_hw_ptr - old_hw_ptr;
385 jdelta = jiffies - runtime->hw_ptr_jiffies;
386 if (delta < 0) {
387 delta += runtime->buffer_size;
388 if (delta < 0) {
389 hw_ptr_error(substream,
390 "Unexpected hw_pointer value [2] "
391 "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
392 substream->stream, (long)pos,
393 (long)old_hw_ptr, jdelta);
394 return 0;
395 }
396 hw_base += runtime->buffer_size;
397 if (hw_base >= runtime->boundary)
398 hw_base = 0;
399 new_hw_ptr = hw_base + pos;
400 }
401 /* Do jiffies check only in xrun_debug mode */
402 if (!xrun_debug(substream, 4))
403 goto no_jiffies_check;
404 if (delta < runtime->delay)
405 goto no_jiffies_check;
406 delta -= runtime->delay;
407 if (((delta * HZ) / runtime->rate) > jdelta + HZ/100) {
408 hw_ptr_error(substream,
409 "hw_ptr skipping! "
410 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
411 (long)pos, (long)delta,
412 (long)runtime->period_size, jdelta,
413 ((delta * HZ) / runtime->rate));
414 return 0;
415 }
416 no_jiffies_check:
417 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
418 runtime->silence_size > 0)
419 snd_pcm_playback_silence(substream, new_hw_ptr);
420
421 if (runtime->status->hw_ptr == new_hw_ptr)
422 return 0;
423
424 runtime->hw_ptr_base = hw_base;
425 runtime->status->hw_ptr = new_hw_ptr;
426 runtime->hw_ptr_jiffies = jiffies;
427 if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
428 snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
429
430 return snd_pcm_update_hw_ptr_post(substream, runtime);
431 }
432
433 /**
434 * snd_pcm_set_ops - set the PCM operators
435 * @pcm: the pcm instance
436 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
437 * @ops: the operator table
438 *
439 * Sets the given PCM operators to the pcm instance.
440 */
441 void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
442 {
443 struct snd_pcm_str *stream = &pcm->streams[direction];
444 struct snd_pcm_substream *substream;
445
446 for (substream = stream->substream; substream != NULL; substream = substream->next)
447 substream->ops = ops;
448 }
449
450 EXPORT_SYMBOL(snd_pcm_set_ops);
451
452 /**
453 * snd_pcm_sync - set the PCM sync id
454 * @substream: the pcm substream
455 *
456 * Sets the PCM sync identifier for the card.
457 */
458 void snd_pcm_set_sync(struct snd_pcm_substream *substream)
459 {
460 struct snd_pcm_runtime *runtime = substream->runtime;
461
462 runtime->sync.id32[0] = substream->pcm->card->number;
463 runtime->sync.id32[1] = -1;
464 runtime->sync.id32[2] = -1;
465 runtime->sync.id32[3] = -1;
466 }
467
468 EXPORT_SYMBOL(snd_pcm_set_sync);
469
470 /*
471 * Standard ioctl routine
472 */
473
474 static inline unsigned int div32(unsigned int a, unsigned int b,
475 unsigned int *r)
476 {
477 if (b == 0) {
478 *r = 0;
479 return UINT_MAX;
480 }
481 *r = a % b;
482 return a / b;
483 }
484
485 static inline unsigned int div_down(unsigned int a, unsigned int b)
486 {
487 if (b == 0)
488 return UINT_MAX;
489 return a / b;
490 }
491
492 static inline unsigned int div_up(unsigned int a, unsigned int b)
493 {
494 unsigned int r;
495 unsigned int q;
496 if (b == 0)
497 return UINT_MAX;
498 q = div32(a, b, &r);
499 if (r)
500 ++q;
501 return q;
502 }
503
504 static inline unsigned int mul(unsigned int a, unsigned int b)
505 {
506 if (a == 0)
507 return 0;
508 if (div_down(UINT_MAX, a) < b)
509 return UINT_MAX;
510 return a * b;
511 }
512
513 static inline unsigned int muldiv32(unsigned int a, unsigned int b,
514 unsigned int c, unsigned int *r)
515 {
516 u_int64_t n = (u_int64_t) a * b;
517 if (c == 0) {
518 snd_BUG_ON(!n);
519 *r = 0;
520 return UINT_MAX;
521 }
522 n = div_u64_rem(n, c, r);
523 if (n >= UINT_MAX) {
524 *r = 0;
525 return UINT_MAX;
526 }
527 return n;
528 }
529
530 /**
531 * snd_interval_refine - refine the interval value of configurator
532 * @i: the interval value to refine
533 * @v: the interval value to refer to
534 *
535 * Refines the interval value with the reference value.
536 * The interval is changed to the range satisfying both intervals.
537 * The interval status (min, max, integer, etc.) are evaluated.
538 *
539 * Returns non-zero if the value is changed, zero if not changed.
540 */
541 int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
542 {
543 int changed = 0;
544 if (snd_BUG_ON(snd_interval_empty(i)))
545 return -EINVAL;
546 if (i->min < v->min) {
547 i->min = v->min;
548 i->openmin = v->openmin;
549 changed = 1;
550 } else if (i->min == v->min && !i->openmin && v->openmin) {
551 i->openmin = 1;
552 changed = 1;
553 }
554 if (i->max > v->max) {
555 i->max = v->max;
556 i->openmax = v->openmax;
557 changed = 1;
558 } else if (i->max == v->max && !i->openmax && v->openmax) {
559 i->openmax = 1;
560 changed = 1;
561 }
562 if (!i->integer && v->integer) {
563 i->integer = 1;
564 changed = 1;
565 }
566 if (i->integer) {
567 if (i->openmin) {
568 i->min++;
569 i->openmin = 0;
570 }
571 if (i->openmax) {
572 i->max--;
573 i->openmax = 0;
574 }
575 } else if (!i->openmin && !i->openmax && i->min == i->max)
576 i->integer = 1;
577 if (snd_interval_checkempty(i)) {
578 snd_interval_none(i);
579 return -EINVAL;
580 }
581 return changed;
582 }
583
584 EXPORT_SYMBOL(snd_interval_refine);
585
586 static int snd_interval_refine_first(struct snd_interval *i)
587 {
588 if (snd_BUG_ON(snd_interval_empty(i)))
589 return -EINVAL;
590 if (snd_interval_single(i))
591 return 0;
592 i->max = i->min;
593 i->openmax = i->openmin;
594 if (i->openmax)
595 i->max++;
596 return 1;
597 }
598
599 static int snd_interval_refine_last(struct snd_interval *i)
600 {
601 if (snd_BUG_ON(snd_interval_empty(i)))
602 return -EINVAL;
603 if (snd_interval_single(i))
604 return 0;
605 i->min = i->max;
606 i->openmin = i->openmax;
607 if (i->openmin)
608 i->min--;
609 return 1;
610 }
611
612 void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
613 {
614 if (a->empty || b->empty) {
615 snd_interval_none(c);
616 return;
617 }
618 c->empty = 0;
619 c->min = mul(a->min, b->min);
620 c->openmin = (a->openmin || b->openmin);
621 c->max = mul(a->max, b->max);
622 c->openmax = (a->openmax || b->openmax);
623 c->integer = (a->integer && b->integer);
624 }
625
626 /**
627 * snd_interval_div - refine the interval value with division
628 * @a: dividend
629 * @b: divisor
630 * @c: quotient
631 *
632 * c = a / b
633 *
634 * Returns non-zero if the value is changed, zero if not changed.
635 */
636 void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
637 {
638 unsigned int r;
639 if (a->empty || b->empty) {
640 snd_interval_none(c);
641 return;
642 }
643 c->empty = 0;
644 c->min = div32(a->min, b->max, &r);
645 c->openmin = (r || a->openmin || b->openmax);
646 if (b->min > 0) {
647 c->max = div32(a->max, b->min, &r);
648 if (r) {
649 c->max++;
650 c->openmax = 1;
651 } else
652 c->openmax = (a->openmax || b->openmin);
653 } else {
654 c->max = UINT_MAX;
655 c->openmax = 0;
656 }
657 c->integer = 0;
658 }
659
660 /**
661 * snd_interval_muldivk - refine the interval value
662 * @a: dividend 1
663 * @b: dividend 2
664 * @k: divisor (as integer)
665 * @c: result
666 *
667 * c = a * b / k
668 *
669 * Returns non-zero if the value is changed, zero if not changed.
670 */
671 void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
672 unsigned int k, struct snd_interval *c)
673 {
674 unsigned int r;
675 if (a->empty || b->empty) {
676 snd_interval_none(c);
677 return;
678 }
679 c->empty = 0;
680 c->min = muldiv32(a->min, b->min, k, &r);
681 c->openmin = (r || a->openmin || b->openmin);
682 c->max = muldiv32(a->max, b->max, k, &r);
683 if (r) {
684 c->max++;
685 c->openmax = 1;
686 } else
687 c->openmax = (a->openmax || b->openmax);
688 c->integer = 0;
689 }
690
691 /**
692 * snd_interval_mulkdiv - refine the interval value
693 * @a: dividend 1
694 * @k: dividend 2 (as integer)
695 * @b: divisor
696 * @c: result
697 *
698 * c = a * k / b
699 *
700 * Returns non-zero if the value is changed, zero if not changed.
701 */
702 void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
703 const struct snd_interval *b, struct snd_interval *c)
704 {
705 unsigned int r;
706 if (a->empty || b->empty) {
707 snd_interval_none(c);
708 return;
709 }
710 c->empty = 0;
711 c->min = muldiv32(a->min, k, b->max, &r);
712 c->openmin = (r || a->openmin || b->openmax);
713 if (b->min > 0) {
714 c->max = muldiv32(a->max, k, b->min, &r);
715 if (r) {
716 c->max++;
717 c->openmax = 1;
718 } else
719 c->openmax = (a->openmax || b->openmin);
720 } else {
721 c->max = UINT_MAX;
722 c->openmax = 0;
723 }
724 c->integer = 0;
725 }
726
727 /* ---- */
728
729
730 /**
731 * snd_interval_ratnum - refine the interval value
732 * @i: interval to refine
733 * @rats_count: number of ratnum_t
734 * @rats: ratnum_t array
735 * @nump: pointer to store the resultant numerator
736 * @denp: pointer to store the resultant denominator
737 *
738 * Returns non-zero if the value is changed, zero if not changed.
739 */
740 int snd_interval_ratnum(struct snd_interval *i,
741 unsigned int rats_count, struct snd_ratnum *rats,
742 unsigned int *nump, unsigned int *denp)
743 {
744 unsigned int best_num, best_diff, best_den;
745 unsigned int k;
746 struct snd_interval t;
747 int err;
748
749 best_num = best_den = best_diff = 0;
750 for (k = 0; k < rats_count; ++k) {
751 unsigned int num = rats[k].num;
752 unsigned int den;
753 unsigned int q = i->min;
754 int diff;
755 if (q == 0)
756 q = 1;
757 den = div_down(num, q);
758 if (den < rats[k].den_min)
759 continue;
760 if (den > rats[k].den_max)
761 den = rats[k].den_max;
762 else {
763 unsigned int r;
764 r = (den - rats[k].den_min) % rats[k].den_step;
765 if (r != 0)
766 den -= 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 = rats[k].num;
786 unsigned int den;
787 unsigned int q = i->max;
788 int diff;
789 if (q == 0) {
790 i->empty = 1;
791 return -EINVAL;
792 }
793 den = div_up(num, q);
794 if (den > rats[k].den_max)
795 continue;
796 if (den < rats[k].den_min)
797 den = rats[k].den_min;
798 else {
799 unsigned int r;
800 r = (den - rats[k].den_min) % rats[k].den_step;
801 if (r != 0)
802 den += rats[k].den_step - r;
803 }
804 diff = q * den - num;
805 if (best_num == 0 ||
806 diff * best_den < best_diff * den) {
807 best_diff = diff;
808 best_den = den;
809 best_num = num;
810 }
811 }
812 if (best_den == 0) {
813 i->empty = 1;
814 return -EINVAL;
815 }
816 t.max = div_up(best_num, best_den);
817 t.openmax = !!(best_num % best_den);
818 t.integer = 0;
819 err = snd_interval_refine(i, &t);
820 if (err < 0)
821 return err;
822
823 if (snd_interval_single(i)) {
824 if (nump)
825 *nump = best_num;
826 if (denp)
827 *denp = best_den;
828 }
829 return err;
830 }
831
832 EXPORT_SYMBOL(snd_interval_ratnum);
833
834 /**
835 * snd_interval_ratden - refine the interval value
836 * @i: interval to refine
837 * @rats_count: number of struct ratden
838 * @rats: struct ratden array
839 * @nump: pointer to store the resultant numerator
840 * @denp: pointer to store the resultant denominator
841 *
842 * Returns non-zero if the value is changed, zero if not changed.
843 */
844 static int snd_interval_ratden(struct snd_interval *i,
845 unsigned int rats_count, struct snd_ratden *rats,
846 unsigned int *nump, unsigned int *denp)
847 {
848 unsigned int best_num, best_diff, best_den;
849 unsigned int k;
850 struct snd_interval t;
851 int err;
852
853 best_num = best_den = best_diff = 0;
854 for (k = 0; k < rats_count; ++k) {
855 unsigned int num;
856 unsigned int den = rats[k].den;
857 unsigned int q = i->min;
858 int diff;
859 num = mul(q, den);
860 if (num > rats[k].num_max)
861 continue;
862 if (num < rats[k].num_min)
863 num = rats[k].num_max;
864 else {
865 unsigned int r;
866 r = (num - rats[k].num_min) % rats[k].num_step;
867 if (r != 0)
868 num += rats[k].num_step - r;
869 }
870 diff = num - q * den;
871 if (best_num == 0 ||
872 diff * best_den < best_diff * den) {
873 best_diff = diff;
874 best_den = den;
875 best_num = num;
876 }
877 }
878 if (best_den == 0) {
879 i->empty = 1;
880 return -EINVAL;
881 }
882 t.min = div_down(best_num, best_den);
883 t.openmin = !!(best_num % best_den);
884
885 best_num = best_den = best_diff = 0;
886 for (k = 0; k < rats_count; ++k) {
887 unsigned int num;
888 unsigned int den = rats[k].den;
889 unsigned int q = i->max;
890 int diff;
891 num = mul(q, den);
892 if (num < rats[k].num_min)
893 continue;
894 if (num > rats[k].num_max)
895 num = rats[k].num_max;
896 else {
897 unsigned int r;
898 r = (num - rats[k].num_min) % rats[k].num_step;
899 if (r != 0)
900 num -= r;
901 }
902 diff = q * den - num;
903 if (best_num == 0 ||
904 diff * best_den < best_diff * den) {
905 best_diff = diff;
906 best_den = den;
907 best_num = num;
908 }
909 }
910 if (best_den == 0) {
911 i->empty = 1;
912 return -EINVAL;
913 }
914 t.max = div_up(best_num, best_den);
915 t.openmax = !!(best_num % best_den);
916 t.integer = 0;
917 err = snd_interval_refine(i, &t);
918 if (err < 0)
919 return err;
920
921 if (snd_interval_single(i)) {
922 if (nump)
923 *nump = best_num;
924 if (denp)
925 *denp = best_den;
926 }
927 return err;
928 }
929
930 /**
931 * snd_interval_list - refine the interval value from the list
932 * @i: the interval value to refine
933 * @count: the number of elements in the list
934 * @list: the value list
935 * @mask: the bit-mask to evaluate
936 *
937 * Refines the interval value from the list.
938 * When mask is non-zero, only the elements corresponding to bit 1 are
939 * evaluated.
940 *
941 * Returns non-zero if the value is changed, zero if not changed.
942 */
943 int snd_interval_list(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
944 {
945 unsigned int k;
946 int changed = 0;
947
948 if (!count) {
949 i->empty = 1;
950 return -EINVAL;
951 }
952 for (k = 0; k < count; k++) {
953 if (mask && !(mask & (1 << k)))
954 continue;
955 if (i->min == list[k] && !i->openmin)
956 goto _l1;
957 if (i->min < list[k]) {
958 i->min = list[k];
959 i->openmin = 0;
960 changed = 1;
961 goto _l1;
962 }
963 }
964 i->empty = 1;
965 return -EINVAL;
966 _l1:
967 for (k = count; k-- > 0;) {
968 if (mask && !(mask & (1 << k)))
969 continue;
970 if (i->max == list[k] && !i->openmax)
971 goto _l2;
972 if (i->max > list[k]) {
973 i->max = list[k];
974 i->openmax = 0;
975 changed = 1;
976 goto _l2;
977 }
978 }
979 i->empty = 1;
980 return -EINVAL;
981 _l2:
982 if (snd_interval_checkempty(i)) {
983 i->empty = 1;
984 return -EINVAL;
985 }
986 return changed;
987 }
988
989 EXPORT_SYMBOL(snd_interval_list);
990
991 static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
992 {
993 unsigned int n;
994 int changed = 0;
995 n = (i->min - min) % step;
996 if (n != 0 || i->openmin) {
997 i->min += step - n;
998 changed = 1;
999 }
1000 n = (i->max - min) % step;
1001 if (n != 0 || i->openmax) {
1002 i->max -= n;
1003 changed = 1;
1004 }
1005 if (snd_interval_checkempty(i)) {
1006 i->empty = 1;
1007 return -EINVAL;
1008 }
1009 return changed;
1010 }
1011
1012 /* Info constraints helpers */
1013
1014 /**
1015 * snd_pcm_hw_rule_add - add the hw-constraint rule
1016 * @runtime: the pcm runtime instance
1017 * @cond: condition bits
1018 * @var: the variable to evaluate
1019 * @func: the evaluation function
1020 * @private: the private data pointer passed to function
1021 * @dep: the dependent variables
1022 *
1023 * Returns zero if successful, or a negative error code on failure.
1024 */
1025 int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
1026 int var,
1027 snd_pcm_hw_rule_func_t func, void *private,
1028 int dep, ...)
1029 {
1030 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1031 struct snd_pcm_hw_rule *c;
1032 unsigned int k;
1033 va_list args;
1034 va_start(args, dep);
1035 if (constrs->rules_num >= constrs->rules_all) {
1036 struct snd_pcm_hw_rule *new;
1037 unsigned int new_rules = constrs->rules_all + 16;
1038 new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
1039 if (!new)
1040 return -ENOMEM;
1041 if (constrs->rules) {
1042 memcpy(new, constrs->rules,
1043 constrs->rules_num * sizeof(*c));
1044 kfree(constrs->rules);
1045 }
1046 constrs->rules = new;
1047 constrs->rules_all = new_rules;
1048 }
1049 c = &constrs->rules[constrs->rules_num];
1050 c->cond = cond;
1051 c->func = func;
1052 c->var = var;
1053 c->private = private;
1054 k = 0;
1055 while (1) {
1056 if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps)))
1057 return -EINVAL;
1058 c->deps[k++] = dep;
1059 if (dep < 0)
1060 break;
1061 dep = va_arg(args, int);
1062 }
1063 constrs->rules_num++;
1064 va_end(args);
1065 return 0;
1066 }
1067
1068 EXPORT_SYMBOL(snd_pcm_hw_rule_add);
1069
1070 /**
1071 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1072 * @runtime: PCM runtime instance
1073 * @var: hw_params variable to apply the mask
1074 * @mask: the bitmap mask
1075 *
1076 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1077 */
1078 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1079 u_int32_t mask)
1080 {
1081 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1082 struct snd_mask *maskp = constrs_mask(constrs, var);
1083 *maskp->bits &= mask;
1084 memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
1085 if (*maskp->bits == 0)
1086 return -EINVAL;
1087 return 0;
1088 }
1089
1090 /**
1091 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1092 * @runtime: PCM runtime instance
1093 * @var: hw_params variable to apply the mask
1094 * @mask: the 64bit bitmap mask
1095 *
1096 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1097 */
1098 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1099 u_int64_t mask)
1100 {
1101 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1102 struct snd_mask *maskp = constrs_mask(constrs, var);
1103 maskp->bits[0] &= (u_int32_t)mask;
1104 maskp->bits[1] &= (u_int32_t)(mask >> 32);
1105 memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
1106 if (! maskp->bits[0] && ! maskp->bits[1])
1107 return -EINVAL;
1108 return 0;
1109 }
1110
1111 /**
1112 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1113 * @runtime: PCM runtime instance
1114 * @var: hw_params variable to apply the integer constraint
1115 *
1116 * Apply the constraint of integer to an interval parameter.
1117 */
1118 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
1119 {
1120 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1121 return snd_interval_setinteger(constrs_interval(constrs, var));
1122 }
1123
1124 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
1125
1126 /**
1127 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1128 * @runtime: PCM runtime instance
1129 * @var: hw_params variable to apply the range
1130 * @min: the minimal value
1131 * @max: the maximal value
1132 *
1133 * Apply the min/max range constraint to an interval parameter.
1134 */
1135 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
1136 unsigned int min, unsigned int max)
1137 {
1138 struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
1139 struct snd_interval t;
1140 t.min = min;
1141 t.max = max;
1142 t.openmin = t.openmax = 0;
1143 t.integer = 0;
1144 return snd_interval_refine(constrs_interval(constrs, var), &t);
1145 }
1146
1147 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
1148
1149 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
1150 struct snd_pcm_hw_rule *rule)
1151 {
1152 struct snd_pcm_hw_constraint_list *list = rule->private;
1153 return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
1154 }
1155
1156
1157 /**
1158 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1159 * @runtime: PCM runtime instance
1160 * @cond: condition bits
1161 * @var: hw_params variable to apply the list constraint
1162 * @l: list
1163 *
1164 * Apply the list of constraints to an interval parameter.
1165 */
1166 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
1167 unsigned int cond,
1168 snd_pcm_hw_param_t var,
1169 struct snd_pcm_hw_constraint_list *l)
1170 {
1171 return snd_pcm_hw_rule_add(runtime, cond, var,
1172 snd_pcm_hw_rule_list, l,
1173 var, -1);
1174 }
1175
1176 EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
1177
1178 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
1179 struct snd_pcm_hw_rule *rule)
1180 {
1181 struct snd_pcm_hw_constraint_ratnums *r = rule->private;
1182 unsigned int num = 0, den = 0;
1183 int err;
1184 err = snd_interval_ratnum(hw_param_interval(params, rule->var),
1185 r->nrats, r->rats, &num, &den);
1186 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1187 params->rate_num = num;
1188 params->rate_den = den;
1189 }
1190 return err;
1191 }
1192
1193 /**
1194 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1195 * @runtime: PCM runtime instance
1196 * @cond: condition bits
1197 * @var: hw_params variable to apply the ratnums constraint
1198 * @r: struct snd_ratnums constriants
1199 */
1200 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
1201 unsigned int cond,
1202 snd_pcm_hw_param_t var,
1203 struct snd_pcm_hw_constraint_ratnums *r)
1204 {
1205 return snd_pcm_hw_rule_add(runtime, cond, var,
1206 snd_pcm_hw_rule_ratnums, r,
1207 var, -1);
1208 }
1209
1210 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
1211
1212 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
1213 struct snd_pcm_hw_rule *rule)
1214 {
1215 struct snd_pcm_hw_constraint_ratdens *r = rule->private;
1216 unsigned int num = 0, den = 0;
1217 int err = snd_interval_ratden(hw_param_interval(params, rule->var),
1218 r->nrats, r->rats, &num, &den);
1219 if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
1220 params->rate_num = num;
1221 params->rate_den = den;
1222 }
1223 return err;
1224 }
1225
1226 /**
1227 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1228 * @runtime: PCM runtime instance
1229 * @cond: condition bits
1230 * @var: hw_params variable to apply the ratdens constraint
1231 * @r: struct snd_ratdens constriants
1232 */
1233 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
1234 unsigned int cond,
1235 snd_pcm_hw_param_t var,
1236 struct snd_pcm_hw_constraint_ratdens *r)
1237 {
1238 return snd_pcm_hw_rule_add(runtime, cond, var,
1239 snd_pcm_hw_rule_ratdens, r,
1240 var, -1);
1241 }
1242
1243 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
1244
1245 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
1246 struct snd_pcm_hw_rule *rule)
1247 {
1248 unsigned int l = (unsigned long) rule->private;
1249 int width = l & 0xffff;
1250 unsigned int msbits = l >> 16;
1251 struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
1252 if (snd_interval_single(i) && snd_interval_value(i) == width)
1253 params->msbits = msbits;
1254 return 0;
1255 }
1256
1257 /**
1258 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1259 * @runtime: PCM runtime instance
1260 * @cond: condition bits
1261 * @width: sample bits width
1262 * @msbits: msbits width
1263 */
1264 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
1265 unsigned int cond,
1266 unsigned int width,
1267 unsigned int msbits)
1268 {
1269 unsigned long l = (msbits << 16) | width;
1270 return snd_pcm_hw_rule_add(runtime, cond, -1,
1271 snd_pcm_hw_rule_msbits,
1272 (void*) l,
1273 SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
1274 }
1275
1276 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
1277
1278 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
1279 struct snd_pcm_hw_rule *rule)
1280 {
1281 unsigned long step = (unsigned long) rule->private;
1282 return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
1283 }
1284
1285 /**
1286 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1287 * @runtime: PCM runtime instance
1288 * @cond: condition bits
1289 * @var: hw_params variable to apply the step constraint
1290 * @step: step size
1291 */
1292 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
1293 unsigned int cond,
1294 snd_pcm_hw_param_t var,
1295 unsigned long step)
1296 {
1297 return snd_pcm_hw_rule_add(runtime, cond, var,
1298 snd_pcm_hw_rule_step, (void *) step,
1299 var, -1);
1300 }
1301
1302 EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
1303
1304 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
1305 {
1306 static unsigned int pow2_sizes[] = {
1307 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1308 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1309 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1310 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1311 };
1312 return snd_interval_list(hw_param_interval(params, rule->var),
1313 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
1314 }
1315
1316 /**
1317 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1318 * @runtime: PCM runtime instance
1319 * @cond: condition bits
1320 * @var: hw_params variable to apply the power-of-2 constraint
1321 */
1322 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
1323 unsigned int cond,
1324 snd_pcm_hw_param_t var)
1325 {
1326 return snd_pcm_hw_rule_add(runtime, cond, var,
1327 snd_pcm_hw_rule_pow2, NULL,
1328 var, -1);
1329 }
1330
1331 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
1332
1333 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
1334 snd_pcm_hw_param_t var)
1335 {
1336 if (hw_is_mask(var)) {
1337 snd_mask_any(hw_param_mask(params, var));
1338 params->cmask |= 1 << var;
1339 params->rmask |= 1 << var;
1340 return;
1341 }
1342 if (hw_is_interval(var)) {
1343 snd_interval_any(hw_param_interval(params, var));
1344 params->cmask |= 1 << var;
1345 params->rmask |= 1 << var;
1346 return;
1347 }
1348 snd_BUG();
1349 }
1350
1351 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
1352 {
1353 unsigned int k;
1354 memset(params, 0, sizeof(*params));
1355 for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
1356 _snd_pcm_hw_param_any(params, k);
1357 for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
1358 _snd_pcm_hw_param_any(params, k);
1359 params->info = ~0U;
1360 }
1361
1362 EXPORT_SYMBOL(_snd_pcm_hw_params_any);
1363
1364 /**
1365 * snd_pcm_hw_param_value - return @params field @var value
1366 * @params: the hw_params instance
1367 * @var: parameter to retrieve
1368 * @dir: pointer to the direction (-1,0,1) or %NULL
1369 *
1370 * Return the value for field @var if it's fixed in configuration space
1371 * defined by @params. Return -%EINVAL otherwise.
1372 */
1373 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
1374 snd_pcm_hw_param_t var, int *dir)
1375 {
1376 if (hw_is_mask(var)) {
1377 const struct snd_mask *mask = hw_param_mask_c(params, var);
1378 if (!snd_mask_single(mask))
1379 return -EINVAL;
1380 if (dir)
1381 *dir = 0;
1382 return snd_mask_value(mask);
1383 }
1384 if (hw_is_interval(var)) {
1385 const struct snd_interval *i = hw_param_interval_c(params, var);
1386 if (!snd_interval_single(i))
1387 return -EINVAL;
1388 if (dir)
1389 *dir = i->openmin;
1390 return snd_interval_value(i);
1391 }
1392 return -EINVAL;
1393 }
1394
1395 EXPORT_SYMBOL(snd_pcm_hw_param_value);
1396
1397 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
1398 snd_pcm_hw_param_t var)
1399 {
1400 if (hw_is_mask(var)) {
1401 snd_mask_none(hw_param_mask(params, var));
1402 params->cmask |= 1 << var;
1403 params->rmask |= 1 << var;
1404 } else if (hw_is_interval(var)) {
1405 snd_interval_none(hw_param_interval(params, var));
1406 params->cmask |= 1 << var;
1407 params->rmask |= 1 << var;
1408 } else {
1409 snd_BUG();
1410 }
1411 }
1412
1413 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
1414
1415 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
1416 snd_pcm_hw_param_t var)
1417 {
1418 int changed;
1419 if (hw_is_mask(var))
1420 changed = snd_mask_refine_first(hw_param_mask(params, var));
1421 else if (hw_is_interval(var))
1422 changed = snd_interval_refine_first(hw_param_interval(params, var));
1423 else
1424 return -EINVAL;
1425 if (changed) {
1426 params->cmask |= 1 << var;
1427 params->rmask |= 1 << var;
1428 }
1429 return changed;
1430 }
1431
1432
1433 /**
1434 * snd_pcm_hw_param_first - refine config space and return minimum value
1435 * @pcm: PCM instance
1436 * @params: the hw_params instance
1437 * @var: parameter to retrieve
1438 * @dir: pointer to the direction (-1,0,1) or %NULL
1439 *
1440 * Inside configuration space defined by @params remove from @var all
1441 * values > minimum. Reduce configuration space accordingly.
1442 * Return the minimum.
1443 */
1444 int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
1445 struct snd_pcm_hw_params *params,
1446 snd_pcm_hw_param_t var, int *dir)
1447 {
1448 int changed = _snd_pcm_hw_param_first(params, var);
1449 if (changed < 0)
1450 return changed;
1451 if (params->rmask) {
1452 int err = snd_pcm_hw_refine(pcm, params);
1453 if (snd_BUG_ON(err < 0))
1454 return err;
1455 }
1456 return snd_pcm_hw_param_value(params, var, dir);
1457 }
1458
1459 EXPORT_SYMBOL(snd_pcm_hw_param_first);
1460
1461 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
1462 snd_pcm_hw_param_t var)
1463 {
1464 int changed;
1465 if (hw_is_mask(var))
1466 changed = snd_mask_refine_last(hw_param_mask(params, var));
1467 else if (hw_is_interval(var))
1468 changed = snd_interval_refine_last(hw_param_interval(params, var));
1469 else
1470 return -EINVAL;
1471 if (changed) {
1472 params->cmask |= 1 << var;
1473 params->rmask |= 1 << var;
1474 }
1475 return changed;
1476 }
1477
1478
1479 /**
1480 * snd_pcm_hw_param_last - refine config space and return maximum value
1481 * @pcm: PCM instance
1482 * @params: the hw_params instance
1483 * @var: parameter to retrieve
1484 * @dir: pointer to the direction (-1,0,1) or %NULL
1485 *
1486 * Inside configuration space defined by @params remove from @var all
1487 * values < maximum. Reduce configuration space accordingly.
1488 * Return the maximum.
1489 */
1490 int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
1491 struct snd_pcm_hw_params *params,
1492 snd_pcm_hw_param_t var, int *dir)
1493 {
1494 int changed = _snd_pcm_hw_param_last(params, var);
1495 if (changed < 0)
1496 return changed;
1497 if (params->rmask) {
1498 int err = snd_pcm_hw_refine(pcm, params);
1499 if (snd_BUG_ON(err < 0))
1500 return err;
1501 }
1502 return snd_pcm_hw_param_value(params, var, dir);
1503 }
1504
1505 EXPORT_SYMBOL(snd_pcm_hw_param_last);
1506
1507 /**
1508 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1509 * @pcm: PCM instance
1510 * @params: the hw_params instance
1511 *
1512 * Choose one configuration from configuration space defined by @params.
1513 * The configuration chosen is that obtained fixing in this order:
1514 * first access, first format, first subformat, min channels,
1515 * min rate, min period time, max buffer size, min tick time
1516 */
1517 int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
1518 struct snd_pcm_hw_params *params)
1519 {
1520 static int vars[] = {
1521 SNDRV_PCM_HW_PARAM_ACCESS,
1522 SNDRV_PCM_HW_PARAM_FORMAT,
1523 SNDRV_PCM_HW_PARAM_SUBFORMAT,
1524 SNDRV_PCM_HW_PARAM_CHANNELS,
1525 SNDRV_PCM_HW_PARAM_RATE,
1526 SNDRV_PCM_HW_PARAM_PERIOD_TIME,
1527 SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
1528 SNDRV_PCM_HW_PARAM_TICK_TIME,
1529 -1
1530 };
1531 int err, *v;
1532
1533 for (v = vars; *v != -1; v++) {
1534 if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
1535 err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
1536 else
1537 err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
1538 if (snd_BUG_ON(err < 0))
1539 return err;
1540 }
1541 return 0;
1542 }
1543
1544 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
1545 void *arg)
1546 {
1547 struct snd_pcm_runtime *runtime = substream->runtime;
1548 unsigned long flags;
1549 snd_pcm_stream_lock_irqsave(substream, flags);
1550 if (snd_pcm_running(substream) &&
1551 snd_pcm_update_hw_ptr(substream) >= 0)
1552 runtime->status->hw_ptr %= runtime->buffer_size;
1553 else
1554 runtime->status->hw_ptr = 0;
1555 snd_pcm_stream_unlock_irqrestore(substream, flags);
1556 return 0;
1557 }
1558
1559 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
1560 void *arg)
1561 {
1562 struct snd_pcm_channel_info *info = arg;
1563 struct snd_pcm_runtime *runtime = substream->runtime;
1564 int width;
1565 if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
1566 info->offset = -1;
1567 return 0;
1568 }
1569 width = snd_pcm_format_physical_width(runtime->format);
1570 if (width < 0)
1571 return width;
1572 info->offset = 0;
1573 switch (runtime->access) {
1574 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
1575 case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
1576 info->first = info->channel * width;
1577 info->step = runtime->channels * width;
1578 break;
1579 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
1580 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
1581 {
1582 size_t size = runtime->dma_bytes / runtime->channels;
1583 info->first = info->channel * size * 8;
1584 info->step = width;
1585 break;
1586 }
1587 default:
1588 snd_BUG();
1589 break;
1590 }
1591 return 0;
1592 }
1593
1594 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
1595 void *arg)
1596 {
1597 struct snd_pcm_hw_params *params = arg;
1598 snd_pcm_format_t format;
1599 int channels, width;
1600
1601 params->fifo_size = substream->runtime->hw.fifo_size;
1602 if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
1603 format = params_format(params);
1604 channels = params_channels(params);
1605 width = snd_pcm_format_physical_width(format);
1606 params->fifo_size /= width * channels;
1607 }
1608 return 0;
1609 }
1610
1611 /**
1612 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1613 * @substream: the pcm substream instance
1614 * @cmd: ioctl command
1615 * @arg: ioctl argument
1616 *
1617 * Processes the generic ioctl commands for PCM.
1618 * Can be passed as the ioctl callback for PCM ops.
1619 *
1620 * Returns zero if successful, or a negative error code on failure.
1621 */
1622 int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
1623 unsigned int cmd, void *arg)
1624 {
1625 switch (cmd) {
1626 case SNDRV_PCM_IOCTL1_INFO:
1627 return 0;
1628 case SNDRV_PCM_IOCTL1_RESET:
1629 return snd_pcm_lib_ioctl_reset(substream, arg);
1630 case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
1631 return snd_pcm_lib_ioctl_channel_info(substream, arg);
1632 case SNDRV_PCM_IOCTL1_FIFO_SIZE:
1633 return snd_pcm_lib_ioctl_fifo_size(substream, arg);
1634 }
1635 return -ENXIO;
1636 }
1637
1638 EXPORT_SYMBOL(snd_pcm_lib_ioctl);
1639
1640 /**
1641 * snd_pcm_period_elapsed - update the pcm status for the next period
1642 * @substream: the pcm substream instance
1643 *
1644 * This function is called from the interrupt handler when the
1645 * PCM has processed the period size. It will update the current
1646 * pointer, wake up sleepers, etc.
1647 *
1648 * Even if more than one periods have elapsed since the last call, you
1649 * have to call this only once.
1650 */
1651 void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
1652 {
1653 struct snd_pcm_runtime *runtime;
1654 unsigned long flags;
1655
1656 if (PCM_RUNTIME_CHECK(substream))
1657 return;
1658 runtime = substream->runtime;
1659
1660 if (runtime->transfer_ack_begin)
1661 runtime->transfer_ack_begin(substream);
1662
1663 snd_pcm_stream_lock_irqsave(substream, flags);
1664 if (!snd_pcm_running(substream) ||
1665 snd_pcm_update_hw_ptr_interrupt(substream) < 0)
1666 goto _end;
1667
1668 if (substream->timer_running)
1669 snd_timer_interrupt(substream->timer, 1);
1670 _end:
1671 snd_pcm_stream_unlock_irqrestore(substream, flags);
1672 if (runtime->transfer_ack_end)
1673 runtime->transfer_ack_end(substream);
1674 kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
1675 }
1676
1677 EXPORT_SYMBOL(snd_pcm_period_elapsed);
1678
1679 /*
1680 * Wait until avail_min data becomes available
1681 * Returns a negative error code if any error occurs during operation.
1682 * The available space is stored on availp. When err = 0 and avail = 0
1683 * on the capture stream, it indicates the stream is in DRAINING state.
1684 */
1685 static int wait_for_avail_min(struct snd_pcm_substream *substream,
1686 snd_pcm_uframes_t *availp)
1687 {
1688 struct snd_pcm_runtime *runtime = substream->runtime;
1689 int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
1690 wait_queue_t wait;
1691 int err = 0;
1692 snd_pcm_uframes_t avail = 0;
1693 long tout;
1694
1695 init_waitqueue_entry(&wait, current);
1696 add_wait_queue(&runtime->sleep, &wait);
1697 for (;;) {
1698 if (signal_pending(current)) {
1699 err = -ERESTARTSYS;
1700 break;
1701 }
1702 set_current_state(TASK_INTERRUPTIBLE);
1703 snd_pcm_stream_unlock_irq(substream);
1704 tout = schedule_timeout(msecs_to_jiffies(10000));
1705 snd_pcm_stream_lock_irq(substream);
1706 switch (runtime->status->state) {
1707 case SNDRV_PCM_STATE_SUSPENDED:
1708 err = -ESTRPIPE;
1709 goto _endloop;
1710 case SNDRV_PCM_STATE_XRUN:
1711 err = -EPIPE;
1712 goto _endloop;
1713 case SNDRV_PCM_STATE_DRAINING:
1714 if (is_playback)
1715 err = -EPIPE;
1716 else
1717 avail = 0; /* indicate draining */
1718 goto _endloop;
1719 case SNDRV_PCM_STATE_OPEN:
1720 case SNDRV_PCM_STATE_SETUP:
1721 case SNDRV_PCM_STATE_DISCONNECTED:
1722 err = -EBADFD;
1723 goto _endloop;
1724 }
1725 if (!tout) {
1726 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1727 is_playback ? "playback" : "capture");
1728 err = -EIO;
1729 break;
1730 }
1731 if (is_playback)
1732 avail = snd_pcm_playback_avail(runtime);
1733 else
1734 avail = snd_pcm_capture_avail(runtime);
1735 if (avail >= runtime->control->avail_min)
1736 break;
1737 }
1738 _endloop:
1739 remove_wait_queue(&runtime->sleep, &wait);
1740 *availp = avail;
1741 return err;
1742 }
1743
1744 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
1745 unsigned int hwoff,
1746 unsigned long data, unsigned int off,
1747 snd_pcm_uframes_t frames)
1748 {
1749 struct snd_pcm_runtime *runtime = substream->runtime;
1750 int err;
1751 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1752 if (substream->ops->copy) {
1753 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1754 return err;
1755 } else {
1756 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1757 if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
1758 return -EFAULT;
1759 }
1760 return 0;
1761 }
1762
1763 typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
1764 unsigned long data, unsigned int off,
1765 snd_pcm_uframes_t size);
1766
1767 static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
1768 unsigned long data,
1769 snd_pcm_uframes_t size,
1770 int nonblock,
1771 transfer_f transfer)
1772 {
1773 struct snd_pcm_runtime *runtime = substream->runtime;
1774 snd_pcm_uframes_t xfer = 0;
1775 snd_pcm_uframes_t offset = 0;
1776 int err = 0;
1777
1778 if (size == 0)
1779 return 0;
1780
1781 snd_pcm_stream_lock_irq(substream);
1782 switch (runtime->status->state) {
1783 case SNDRV_PCM_STATE_PREPARED:
1784 case SNDRV_PCM_STATE_RUNNING:
1785 case SNDRV_PCM_STATE_PAUSED:
1786 break;
1787 case SNDRV_PCM_STATE_XRUN:
1788 err = -EPIPE;
1789 goto _end_unlock;
1790 case SNDRV_PCM_STATE_SUSPENDED:
1791 err = -ESTRPIPE;
1792 goto _end_unlock;
1793 default:
1794 err = -EBADFD;
1795 goto _end_unlock;
1796 }
1797
1798 while (size > 0) {
1799 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
1800 snd_pcm_uframes_t avail;
1801 snd_pcm_uframes_t cont;
1802 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
1803 snd_pcm_update_hw_ptr(substream);
1804 avail = snd_pcm_playback_avail(runtime);
1805 if (!avail) {
1806 if (nonblock) {
1807 err = -EAGAIN;
1808 goto _end_unlock;
1809 }
1810 err = wait_for_avail_min(substream, &avail);
1811 if (err < 0)
1812 goto _end_unlock;
1813 }
1814 frames = size > avail ? avail : size;
1815 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
1816 if (frames > cont)
1817 frames = cont;
1818 if (snd_BUG_ON(!frames)) {
1819 snd_pcm_stream_unlock_irq(substream);
1820 return -EINVAL;
1821 }
1822 appl_ptr = runtime->control->appl_ptr;
1823 appl_ofs = appl_ptr % runtime->buffer_size;
1824 snd_pcm_stream_unlock_irq(substream);
1825 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
1826 goto _end;
1827 snd_pcm_stream_lock_irq(substream);
1828 switch (runtime->status->state) {
1829 case SNDRV_PCM_STATE_XRUN:
1830 err = -EPIPE;
1831 goto _end_unlock;
1832 case SNDRV_PCM_STATE_SUSPENDED:
1833 err = -ESTRPIPE;
1834 goto _end_unlock;
1835 default:
1836 break;
1837 }
1838 appl_ptr += frames;
1839 if (appl_ptr >= runtime->boundary)
1840 appl_ptr -= runtime->boundary;
1841 runtime->control->appl_ptr = appl_ptr;
1842 if (substream->ops->ack)
1843 substream->ops->ack(substream);
1844
1845 offset += frames;
1846 size -= frames;
1847 xfer += frames;
1848 if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
1849 snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
1850 err = snd_pcm_start(substream);
1851 if (err < 0)
1852 goto _end_unlock;
1853 }
1854 }
1855 _end_unlock:
1856 snd_pcm_stream_unlock_irq(substream);
1857 _end:
1858 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
1859 }
1860
1861 /* sanity-check for read/write methods */
1862 static int pcm_sanity_check(struct snd_pcm_substream *substream)
1863 {
1864 struct snd_pcm_runtime *runtime;
1865 if (PCM_RUNTIME_CHECK(substream))
1866 return -ENXIO;
1867 runtime = substream->runtime;
1868 if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
1869 return -EINVAL;
1870 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
1871 return -EBADFD;
1872 return 0;
1873 }
1874
1875 snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
1876 {
1877 struct snd_pcm_runtime *runtime;
1878 int nonblock;
1879 int err;
1880
1881 err = pcm_sanity_check(substream);
1882 if (err < 0)
1883 return err;
1884 runtime = substream->runtime;
1885 nonblock = !!(substream->f_flags & O_NONBLOCK);
1886
1887 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
1888 runtime->channels > 1)
1889 return -EINVAL;
1890 return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
1891 snd_pcm_lib_write_transfer);
1892 }
1893
1894 EXPORT_SYMBOL(snd_pcm_lib_write);
1895
1896 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
1897 unsigned int hwoff,
1898 unsigned long data, unsigned int off,
1899 snd_pcm_uframes_t frames)
1900 {
1901 struct snd_pcm_runtime *runtime = substream->runtime;
1902 int err;
1903 void __user **bufs = (void __user **)data;
1904 int channels = runtime->channels;
1905 int c;
1906 if (substream->ops->copy) {
1907 if (snd_BUG_ON(!substream->ops->silence))
1908 return -EINVAL;
1909 for (c = 0; c < channels; ++c, ++bufs) {
1910 if (*bufs == NULL) {
1911 if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
1912 return err;
1913 } else {
1914 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1915 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
1916 return err;
1917 }
1918 }
1919 } else {
1920 /* default transfer behaviour */
1921 size_t dma_csize = runtime->dma_bytes / channels;
1922 for (c = 0; c < channels; ++c, ++bufs) {
1923 char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
1924 if (*bufs == NULL) {
1925 snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
1926 } else {
1927 char __user *buf = *bufs + samples_to_bytes(runtime, off);
1928 if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
1929 return -EFAULT;
1930 }
1931 }
1932 }
1933 return 0;
1934 }
1935
1936 snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
1937 void __user **bufs,
1938 snd_pcm_uframes_t frames)
1939 {
1940 struct snd_pcm_runtime *runtime;
1941 int nonblock;
1942 int err;
1943
1944 err = pcm_sanity_check(substream);
1945 if (err < 0)
1946 return err;
1947 runtime = substream->runtime;
1948 nonblock = !!(substream->f_flags & O_NONBLOCK);
1949
1950 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
1951 return -EINVAL;
1952 return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
1953 nonblock, snd_pcm_lib_writev_transfer);
1954 }
1955
1956 EXPORT_SYMBOL(snd_pcm_lib_writev);
1957
1958 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
1959 unsigned int hwoff,
1960 unsigned long data, unsigned int off,
1961 snd_pcm_uframes_t frames)
1962 {
1963 struct snd_pcm_runtime *runtime = substream->runtime;
1964 int err;
1965 char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
1966 if (substream->ops->copy) {
1967 if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
1968 return err;
1969 } else {
1970 char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
1971 if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
1972 return -EFAULT;
1973 }
1974 return 0;
1975 }
1976
1977 static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
1978 unsigned long data,
1979 snd_pcm_uframes_t size,
1980 int nonblock,
1981 transfer_f transfer)
1982 {
1983 struct snd_pcm_runtime *runtime = substream->runtime;
1984 snd_pcm_uframes_t xfer = 0;
1985 snd_pcm_uframes_t offset = 0;
1986 int err = 0;
1987
1988 if (size == 0)
1989 return 0;
1990
1991 snd_pcm_stream_lock_irq(substream);
1992 switch (runtime->status->state) {
1993 case SNDRV_PCM_STATE_PREPARED:
1994 if (size >= runtime->start_threshold) {
1995 err = snd_pcm_start(substream);
1996 if (err < 0)
1997 goto _end_unlock;
1998 }
1999 break;
2000 case SNDRV_PCM_STATE_DRAINING:
2001 case SNDRV_PCM_STATE_RUNNING:
2002 case SNDRV_PCM_STATE_PAUSED:
2003 break;
2004 case SNDRV_PCM_STATE_XRUN:
2005 err = -EPIPE;
2006 goto _end_unlock;
2007 case SNDRV_PCM_STATE_SUSPENDED:
2008 err = -ESTRPIPE;
2009 goto _end_unlock;
2010 default:
2011 err = -EBADFD;
2012 goto _end_unlock;
2013 }
2014
2015 while (size > 0) {
2016 snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
2017 snd_pcm_uframes_t avail;
2018 snd_pcm_uframes_t cont;
2019 if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
2020 snd_pcm_update_hw_ptr(substream);
2021 avail = snd_pcm_capture_avail(runtime);
2022 if (!avail) {
2023 if (runtime->status->state ==
2024 SNDRV_PCM_STATE_DRAINING) {
2025 snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
2026 goto _end_unlock;
2027 }
2028 if (nonblock) {
2029 err = -EAGAIN;
2030 goto _end_unlock;
2031 }
2032 err = wait_for_avail_min(substream, &avail);
2033 if (err < 0)
2034 goto _end_unlock;
2035 if (!avail)
2036 continue; /* draining */
2037 }
2038 frames = size > avail ? avail : size;
2039 cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
2040 if (frames > cont)
2041 frames = cont;
2042 if (snd_BUG_ON(!frames)) {
2043 snd_pcm_stream_unlock_irq(substream);
2044 return -EINVAL;
2045 }
2046 appl_ptr = runtime->control->appl_ptr;
2047 appl_ofs = appl_ptr % runtime->buffer_size;
2048 snd_pcm_stream_unlock_irq(substream);
2049 if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
2050 goto _end;
2051 snd_pcm_stream_lock_irq(substream);
2052 switch (runtime->status->state) {
2053 case SNDRV_PCM_STATE_XRUN:
2054 err = -EPIPE;
2055 goto _end_unlock;
2056 case SNDRV_PCM_STATE_SUSPENDED:
2057 err = -ESTRPIPE;
2058 goto _end_unlock;
2059 default:
2060 break;
2061 }
2062 appl_ptr += frames;
2063 if (appl_ptr >= runtime->boundary)
2064 appl_ptr -= runtime->boundary;
2065 runtime->control->appl_ptr = appl_ptr;
2066 if (substream->ops->ack)
2067 substream->ops->ack(substream);
2068
2069 offset += frames;
2070 size -= frames;
2071 xfer += frames;
2072 }
2073 _end_unlock:
2074 snd_pcm_stream_unlock_irq(substream);
2075 _end:
2076 return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
2077 }
2078
2079 snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
2080 {
2081 struct snd_pcm_runtime *runtime;
2082 int nonblock;
2083 int err;
2084
2085 err = pcm_sanity_check(substream);
2086 if (err < 0)
2087 return err;
2088 runtime = substream->runtime;
2089 nonblock = !!(substream->f_flags & O_NONBLOCK);
2090 if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
2091 return -EINVAL;
2092 return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
2093 }
2094
2095 EXPORT_SYMBOL(snd_pcm_lib_read);
2096
2097 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
2098 unsigned int hwoff,
2099 unsigned long data, unsigned int off,
2100 snd_pcm_uframes_t frames)
2101 {
2102 struct snd_pcm_runtime *runtime = substream->runtime;
2103 int err;
2104 void __user **bufs = (void __user **)data;
2105 int channels = runtime->channels;
2106 int c;
2107 if (substream->ops->copy) {
2108 for (c = 0; c < channels; ++c, ++bufs) {
2109 char __user *buf;
2110 if (*bufs == NULL)
2111 continue;
2112 buf = *bufs + samples_to_bytes(runtime, off);
2113 if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
2114 return err;
2115 }
2116 } else {
2117 snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
2118 for (c = 0; c < channels; ++c, ++bufs) {
2119 char *hwbuf;
2120 char __user *buf;
2121 if (*bufs == NULL)
2122 continue;
2123
2124 hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
2125 buf = *bufs + samples_to_bytes(runtime, off);
2126 if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
2127 return -EFAULT;
2128 }
2129 }
2130 return 0;
2131 }
2132
2133 snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
2134 void __user **bufs,
2135 snd_pcm_uframes_t frames)
2136 {
2137 struct snd_pcm_runtime *runtime;
2138 int nonblock;
2139 int err;
2140
2141 err = pcm_sanity_check(substream);
2142 if (err < 0)
2143 return err;
2144 runtime = substream->runtime;
2145 if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
2146 return -EBADFD;
2147
2148 nonblock = !!(substream->f_flags & O_NONBLOCK);
2149 if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
2150 return -EINVAL;
2151 return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
2152 }
2153
2154 EXPORT_SYMBOL(snd_pcm_lib_readv);
Support for the Chinese Samsung S3C2440 based development boards