2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Abramo Bagnara <abramo@alsa-project.org>
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.
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.
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
23 #include <linux/slab.h>
24 #include <linux/time.h>
25 #include <linux/math64.h>
26 #include <linux/export.h>
27 #include <sound/core.h>
28 #include <sound/control.h>
29 #include <sound/info.h>
30 #include <sound/pcm.h>
31 #include <sound/pcm_params.h>
32 #include <sound/timer.h>
35 * fill ring buffer with silence
36 * runtime->silence_start: starting pointer to silence area
37 * runtime->silence_filled: size filled with silence
38 * runtime->silence_threshold: threshold from application
39 * runtime->silence_size: maximal size from application
41 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
43 void snd_pcm_playback_silence(struct snd_pcm_substream
*substream
, snd_pcm_uframes_t new_hw_ptr
)
45 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
46 snd_pcm_uframes_t frames
, ofs
, transfer
;
48 if (runtime
->silence_size
< runtime
->boundary
) {
49 snd_pcm_sframes_t noise_dist
, n
;
50 if (runtime
->silence_start
!= runtime
->control
->appl_ptr
) {
51 n
= runtime
->control
->appl_ptr
- runtime
->silence_start
;
53 n
+= runtime
->boundary
;
54 if ((snd_pcm_uframes_t
)n
< runtime
->silence_filled
)
55 runtime
->silence_filled
-= n
;
57 runtime
->silence_filled
= 0;
58 runtime
->silence_start
= runtime
->control
->appl_ptr
;
60 if (runtime
->silence_filled
>= runtime
->buffer_size
)
62 noise_dist
= snd_pcm_playback_hw_avail(runtime
) + runtime
->silence_filled
;
63 if (noise_dist
>= (snd_pcm_sframes_t
) runtime
->silence_threshold
)
65 frames
= runtime
->silence_threshold
- noise_dist
;
66 if (frames
> runtime
->silence_size
)
67 frames
= runtime
->silence_size
;
69 if (new_hw_ptr
== ULONG_MAX
) { /* initialization */
70 snd_pcm_sframes_t avail
= snd_pcm_playback_hw_avail(runtime
);
71 if (avail
> runtime
->buffer_size
)
72 avail
= runtime
->buffer_size
;
73 runtime
->silence_filled
= avail
> 0 ? avail
: 0;
74 runtime
->silence_start
= (runtime
->status
->hw_ptr
+
75 runtime
->silence_filled
) %
78 ofs
= runtime
->status
->hw_ptr
;
79 frames
= new_hw_ptr
- ofs
;
80 if ((snd_pcm_sframes_t
)frames
< 0)
81 frames
+= runtime
->boundary
;
82 runtime
->silence_filled
-= frames
;
83 if ((snd_pcm_sframes_t
)runtime
->silence_filled
< 0) {
84 runtime
->silence_filled
= 0;
85 runtime
->silence_start
= new_hw_ptr
;
87 runtime
->silence_start
= ofs
;
90 frames
= runtime
->buffer_size
- runtime
->silence_filled
;
92 if (snd_BUG_ON(frames
> runtime
->buffer_size
))
96 ofs
= runtime
->silence_start
% runtime
->buffer_size
;
98 transfer
= ofs
+ frames
> runtime
->buffer_size
? runtime
->buffer_size
- ofs
: frames
;
99 if (runtime
->access
== SNDRV_PCM_ACCESS_RW_INTERLEAVED
||
100 runtime
->access
== SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
) {
101 if (substream
->ops
->silence
) {
103 err
= substream
->ops
->silence(substream
, -1, ofs
, transfer
);
106 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, ofs
);
107 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
* runtime
->channels
);
111 unsigned int channels
= runtime
->channels
;
112 if (substream
->ops
->silence
) {
113 for (c
= 0; c
< channels
; ++c
) {
115 err
= substream
->ops
->silence(substream
, c
, ofs
, transfer
);
119 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
120 for (c
= 0; c
< channels
; ++c
) {
121 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, ofs
);
122 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
);
126 runtime
->silence_filled
+= transfer
;
132 #ifdef CONFIG_SND_DEBUG
133 void snd_pcm_debug_name(struct snd_pcm_substream
*substream
,
134 char *name
, size_t len
)
136 snprintf(name
, len
, "pcmC%dD%d%c:%d",
137 substream
->pcm
->card
->number
,
138 substream
->pcm
->device
,
139 substream
->stream
? 'c' : 'p',
142 EXPORT_SYMBOL(snd_pcm_debug_name
);
145 #define XRUN_DEBUG_BASIC (1<<0)
146 #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
147 #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
148 #define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
149 #define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
150 #define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
151 #define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
153 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
155 #define xrun_debug(substream, mask) \
156 ((substream)->pstr->xrun_debug & (mask))
158 #define xrun_debug(substream, mask) 0
161 #define dump_stack_on_xrun(substream) do { \
162 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
166 static void xrun(struct snd_pcm_substream
*substream
)
168 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
170 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
171 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
172 snd_pcm_stop(substream
, SNDRV_PCM_STATE_XRUN
);
173 if (xrun_debug(substream
, XRUN_DEBUG_BASIC
)) {
175 snd_pcm_debug_name(substream
, name
, sizeof(name
));
176 snd_printd(KERN_DEBUG
"XRUN: %s\n", name
);
177 dump_stack_on_xrun(substream
);
181 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
182 #define hw_ptr_error(substream, fmt, args...) \
184 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
185 xrun_log_show(substream); \
186 if (printk_ratelimit()) { \
187 snd_printd("PCM: " fmt, ##args); \
189 dump_stack_on_xrun(substream); \
193 #define XRUN_LOG_CNT 10
195 struct hwptr_log_entry
{
196 unsigned int in_interrupt
;
197 unsigned long jiffies
;
198 snd_pcm_uframes_t pos
;
199 snd_pcm_uframes_t period_size
;
200 snd_pcm_uframes_t buffer_size
;
201 snd_pcm_uframes_t old_hw_ptr
;
202 snd_pcm_uframes_t hw_ptr_base
;
205 struct snd_pcm_hwptr_log
{
208 struct hwptr_log_entry entries
[XRUN_LOG_CNT
];
211 static void xrun_log(struct snd_pcm_substream
*substream
,
212 snd_pcm_uframes_t pos
, int in_interrupt
)
214 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
215 struct snd_pcm_hwptr_log
*log
= runtime
->hwptr_log
;
216 struct hwptr_log_entry
*entry
;
219 log
= kzalloc(sizeof(*log
), GFP_ATOMIC
);
222 runtime
->hwptr_log
= log
;
224 if (xrun_debug(substream
, XRUN_DEBUG_LOGONCE
) && log
->hit
)
227 entry
= &log
->entries
[log
->idx
];
228 entry
->in_interrupt
= in_interrupt
;
229 entry
->jiffies
= jiffies
;
231 entry
->period_size
= runtime
->period_size
;
232 entry
->buffer_size
= runtime
->buffer_size
;
233 entry
->old_hw_ptr
= runtime
->status
->hw_ptr
;
234 entry
->hw_ptr_base
= runtime
->hw_ptr_base
;
235 log
->idx
= (log
->idx
+ 1) % XRUN_LOG_CNT
;
238 static void xrun_log_show(struct snd_pcm_substream
*substream
)
240 struct snd_pcm_hwptr_log
*log
= substream
->runtime
->hwptr_log
;
241 struct hwptr_log_entry
*entry
;
248 if (xrun_debug(substream
, XRUN_DEBUG_LOGONCE
) && log
->hit
)
250 snd_pcm_debug_name(substream
, name
, sizeof(name
));
251 for (cnt
= 0, idx
= log
->idx
; cnt
< XRUN_LOG_CNT
; cnt
++) {
252 entry
= &log
->entries
[idx
];
253 if (entry
->period_size
== 0)
255 snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
257 name
, entry
->in_interrupt
? "[Q] " : "",
259 (unsigned long)entry
->pos
,
260 (unsigned long)entry
->period_size
,
261 (unsigned long)entry
->buffer_size
,
262 (unsigned long)entry
->old_hw_ptr
,
263 (unsigned long)entry
->hw_ptr_base
);
270 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
272 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
273 #define xrun_log(substream, pos, in_interrupt) do { } while (0)
274 #define xrun_log_show(substream) do { } while (0)
278 int snd_pcm_update_state(struct snd_pcm_substream
*substream
,
279 struct snd_pcm_runtime
*runtime
)
281 snd_pcm_uframes_t avail
;
283 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
284 avail
= snd_pcm_playback_avail(runtime
);
286 avail
= snd_pcm_capture_avail(runtime
);
287 if (avail
> runtime
->avail_max
)
288 runtime
->avail_max
= avail
;
289 if (runtime
->status
->state
== SNDRV_PCM_STATE_DRAINING
) {
290 if (avail
>= runtime
->buffer_size
) {
291 snd_pcm_drain_done(substream
);
295 if (avail
>= runtime
->stop_threshold
) {
300 if (runtime
->twake
) {
301 if (avail
>= runtime
->twake
)
302 wake_up(&runtime
->tsleep
);
303 } else if (avail
>= runtime
->control
->avail_min
)
304 wake_up(&runtime
->sleep
);
308 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream
*substream
,
309 unsigned int in_interrupt
)
311 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
312 snd_pcm_uframes_t pos
;
313 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
, hw_base
;
314 snd_pcm_sframes_t hdelta
, delta
;
315 unsigned long jdelta
;
317 old_hw_ptr
= runtime
->status
->hw_ptr
;
318 pos
= substream
->ops
->pointer(substream
);
319 if (pos
== SNDRV_PCM_POS_XRUN
) {
323 if (pos
>= runtime
->buffer_size
) {
324 if (printk_ratelimit()) {
326 snd_pcm_debug_name(substream
, name
, sizeof(name
));
327 xrun_log_show(substream
);
328 snd_printd(KERN_ERR
"BUG: %s, pos = %ld, "
329 "buffer size = %ld, period size = %ld\n",
330 name
, pos
, runtime
->buffer_size
,
331 runtime
->period_size
);
335 pos
-= pos
% runtime
->min_align
;
336 if (xrun_debug(substream
, XRUN_DEBUG_LOG
))
337 xrun_log(substream
, pos
, in_interrupt
);
338 hw_base
= runtime
->hw_ptr_base
;
339 new_hw_ptr
= hw_base
+ pos
;
341 /* we know that one period was processed */
342 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
343 delta
= runtime
->hw_ptr_interrupt
+ runtime
->period_size
;
344 if (delta
> new_hw_ptr
) {
345 /* check for double acknowledged interrupts */
346 hdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
347 if (hdelta
> runtime
->hw_ptr_buffer_jiffies
/2) {
348 hw_base
+= runtime
->buffer_size
;
349 if (hw_base
>= runtime
->boundary
)
351 new_hw_ptr
= hw_base
+ pos
;
356 /* new_hw_ptr might be lower than old_hw_ptr in case when */
357 /* pointer crosses the end of the ring buffer */
358 if (new_hw_ptr
< old_hw_ptr
) {
359 hw_base
+= runtime
->buffer_size
;
360 if (hw_base
>= runtime
->boundary
)
362 new_hw_ptr
= hw_base
+ pos
;
365 delta
= new_hw_ptr
- old_hw_ptr
;
367 delta
+= runtime
->boundary
;
368 if (xrun_debug(substream
, in_interrupt
?
369 XRUN_DEBUG_PERIODUPDATE
: XRUN_DEBUG_HWPTRUPDATE
)) {
371 snd_pcm_debug_name(substream
, name
, sizeof(name
));
372 snd_printd("%s_update: %s: pos=%u/%u/%u, "
373 "hwptr=%ld/%ld/%ld/%ld\n",
374 in_interrupt
? "period" : "hwptr",
377 (unsigned int)runtime
->period_size
,
378 (unsigned int)runtime
->buffer_size
,
379 (unsigned long)delta
,
380 (unsigned long)old_hw_ptr
,
381 (unsigned long)new_hw_ptr
,
382 (unsigned long)runtime
->hw_ptr_base
);
385 if (runtime
->no_period_wakeup
) {
386 snd_pcm_sframes_t xrun_threshold
;
388 * Without regular period interrupts, we have to check
389 * the elapsed time to detect xruns.
391 jdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
392 if (jdelta
< runtime
->hw_ptr_buffer_jiffies
/ 2)
394 hdelta
= jdelta
- delta
* HZ
/ runtime
->rate
;
395 xrun_threshold
= runtime
->hw_ptr_buffer_jiffies
/ 2 + 1;
396 while (hdelta
> xrun_threshold
) {
397 delta
+= runtime
->buffer_size
;
398 hw_base
+= runtime
->buffer_size
;
399 if (hw_base
>= runtime
->boundary
)
401 new_hw_ptr
= hw_base
+ pos
;
402 hdelta
-= runtime
->hw_ptr_buffer_jiffies
;
407 /* something must be really wrong */
408 if (delta
>= runtime
->buffer_size
+ runtime
->period_size
) {
409 hw_ptr_error(substream
,
410 "Unexpected hw_pointer value %s"
411 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
413 in_interrupt
? "[Q] " : "[P]",
414 substream
->stream
, (long)pos
,
415 (long)new_hw_ptr
, (long)old_hw_ptr
);
419 /* Do jiffies check only in xrun_debug mode */
420 if (!xrun_debug(substream
, XRUN_DEBUG_JIFFIESCHECK
))
421 goto no_jiffies_check
;
423 /* Skip the jiffies check for hardwares with BATCH flag.
424 * Such hardware usually just increases the position at each IRQ,
425 * thus it can't give any strange position.
427 if (runtime
->hw
.info
& SNDRV_PCM_INFO_BATCH
)
428 goto no_jiffies_check
;
430 if (hdelta
< runtime
->delay
)
431 goto no_jiffies_check
;
432 hdelta
-= runtime
->delay
;
433 jdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
434 if (((hdelta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
436 (((runtime
->period_size
* HZ
) / runtime
->rate
)
438 /* move new_hw_ptr according jiffies not pos variable */
439 new_hw_ptr
= old_hw_ptr
;
441 /* use loop to avoid checks for delta overflows */
442 /* the delta value is small or zero in most cases */
444 new_hw_ptr
+= runtime
->period_size
;
445 if (new_hw_ptr
>= runtime
->boundary
)
446 new_hw_ptr
-= runtime
->boundary
;
449 /* align hw_base to buffer_size */
450 hw_ptr_error(substream
,
451 "hw_ptr skipping! %s"
452 "(pos=%ld, delta=%ld, period=%ld, "
453 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
454 in_interrupt
? "[Q] " : "",
455 (long)pos
, (long)hdelta
,
456 (long)runtime
->period_size
, jdelta
,
457 ((hdelta
* HZ
) / runtime
->rate
), hw_base
,
458 (unsigned long)old_hw_ptr
,
459 (unsigned long)new_hw_ptr
);
460 /* reset values to proper state */
462 hw_base
= new_hw_ptr
- (new_hw_ptr
% runtime
->buffer_size
);
465 if (delta
> runtime
->period_size
+ runtime
->period_size
/ 2) {
466 hw_ptr_error(substream
,
467 "Lost interrupts? %s"
468 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
470 in_interrupt
? "[Q] " : "",
471 substream
->stream
, (long)delta
,
477 if (runtime
->status
->hw_ptr
== new_hw_ptr
)
480 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
481 runtime
->silence_size
> 0)
482 snd_pcm_playback_silence(substream
, new_hw_ptr
);
485 delta
= new_hw_ptr
- runtime
->hw_ptr_interrupt
;
487 delta
+= runtime
->boundary
;
488 delta
-= (snd_pcm_uframes_t
)delta
% runtime
->period_size
;
489 runtime
->hw_ptr_interrupt
+= delta
;
490 if (runtime
->hw_ptr_interrupt
>= runtime
->boundary
)
491 runtime
->hw_ptr_interrupt
-= runtime
->boundary
;
493 runtime
->hw_ptr_base
= hw_base
;
494 runtime
->status
->hw_ptr
= new_hw_ptr
;
495 runtime
->hw_ptr_jiffies
= jiffies
;
496 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
497 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
499 return snd_pcm_update_state(substream
, runtime
);
502 /* CAUTION: call it with irq disabled */
503 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
)
505 return snd_pcm_update_hw_ptr0(substream
, 0);
509 * snd_pcm_set_ops - set the PCM operators
510 * @pcm: the pcm instance
511 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
512 * @ops: the operator table
514 * Sets the given PCM operators to the pcm instance.
516 void snd_pcm_set_ops(struct snd_pcm
*pcm
, int direction
, struct snd_pcm_ops
*ops
)
518 struct snd_pcm_str
*stream
= &pcm
->streams
[direction
];
519 struct snd_pcm_substream
*substream
;
521 for (substream
= stream
->substream
; substream
!= NULL
; substream
= substream
->next
)
522 substream
->ops
= ops
;
525 EXPORT_SYMBOL(snd_pcm_set_ops
);
528 * snd_pcm_sync - set the PCM sync id
529 * @substream: the pcm substream
531 * Sets the PCM sync identifier for the card.
533 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
)
535 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
537 runtime
->sync
.id32
[0] = substream
->pcm
->card
->number
;
538 runtime
->sync
.id32
[1] = -1;
539 runtime
->sync
.id32
[2] = -1;
540 runtime
->sync
.id32
[3] = -1;
543 EXPORT_SYMBOL(snd_pcm_set_sync
);
546 * Standard ioctl routine
549 static inline unsigned int div32(unsigned int a
, unsigned int b
,
560 static inline unsigned int div_down(unsigned int a
, unsigned int b
)
567 static inline unsigned int div_up(unsigned int a
, unsigned int b
)
579 static inline unsigned int mul(unsigned int a
, unsigned int b
)
583 if (div_down(UINT_MAX
, a
) < b
)
588 static inline unsigned int muldiv32(unsigned int a
, unsigned int b
,
589 unsigned int c
, unsigned int *r
)
591 u_int64_t n
= (u_int64_t
) a
* b
;
597 n
= div_u64_rem(n
, c
, r
);
606 * snd_interval_refine - refine the interval value of configurator
607 * @i: the interval value to refine
608 * @v: the interval value to refer to
610 * Refines the interval value with the reference value.
611 * The interval is changed to the range satisfying both intervals.
612 * The interval status (min, max, integer, etc.) are evaluated.
614 * Returns non-zero if the value is changed, zero if not changed.
616 int snd_interval_refine(struct snd_interval
*i
, const struct snd_interval
*v
)
619 if (snd_BUG_ON(snd_interval_empty(i
)))
621 if (i
->min
< v
->min
) {
623 i
->openmin
= v
->openmin
;
625 } else if (i
->min
== v
->min
&& !i
->openmin
&& v
->openmin
) {
629 if (i
->max
> v
->max
) {
631 i
->openmax
= v
->openmax
;
633 } else if (i
->max
== v
->max
&& !i
->openmax
&& v
->openmax
) {
637 if (!i
->integer
&& v
->integer
) {
650 } else if (!i
->openmin
&& !i
->openmax
&& i
->min
== i
->max
)
652 if (snd_interval_checkempty(i
)) {
653 snd_interval_none(i
);
659 EXPORT_SYMBOL(snd_interval_refine
);
661 static int snd_interval_refine_first(struct snd_interval
*i
)
663 if (snd_BUG_ON(snd_interval_empty(i
)))
665 if (snd_interval_single(i
))
668 i
->openmax
= i
->openmin
;
674 static int snd_interval_refine_last(struct snd_interval
*i
)
676 if (snd_BUG_ON(snd_interval_empty(i
)))
678 if (snd_interval_single(i
))
681 i
->openmin
= i
->openmax
;
687 void snd_interval_mul(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
689 if (a
->empty
|| b
->empty
) {
690 snd_interval_none(c
);
694 c
->min
= mul(a
->min
, b
->min
);
695 c
->openmin
= (a
->openmin
|| b
->openmin
);
696 c
->max
= mul(a
->max
, b
->max
);
697 c
->openmax
= (a
->openmax
|| b
->openmax
);
698 c
->integer
= (a
->integer
&& b
->integer
);
702 * snd_interval_div - refine the interval value with division
709 * Returns non-zero if the value is changed, zero if not changed.
711 void snd_interval_div(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
714 if (a
->empty
|| b
->empty
) {
715 snd_interval_none(c
);
719 c
->min
= div32(a
->min
, b
->max
, &r
);
720 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
722 c
->max
= div32(a
->max
, b
->min
, &r
);
727 c
->openmax
= (a
->openmax
|| b
->openmin
);
736 * snd_interval_muldivk - refine the interval value
739 * @k: divisor (as integer)
744 * Returns non-zero if the value is changed, zero if not changed.
746 void snd_interval_muldivk(const struct snd_interval
*a
, const struct snd_interval
*b
,
747 unsigned int k
, struct snd_interval
*c
)
750 if (a
->empty
|| b
->empty
) {
751 snd_interval_none(c
);
755 c
->min
= muldiv32(a
->min
, b
->min
, k
, &r
);
756 c
->openmin
= (r
|| a
->openmin
|| b
->openmin
);
757 c
->max
= muldiv32(a
->max
, b
->max
, k
, &r
);
762 c
->openmax
= (a
->openmax
|| b
->openmax
);
767 * snd_interval_mulkdiv - refine the interval value
769 * @k: dividend 2 (as integer)
775 * Returns non-zero if the value is changed, zero if not changed.
777 void snd_interval_mulkdiv(const struct snd_interval
*a
, unsigned int k
,
778 const struct snd_interval
*b
, struct snd_interval
*c
)
781 if (a
->empty
|| b
->empty
) {
782 snd_interval_none(c
);
786 c
->min
= muldiv32(a
->min
, k
, b
->max
, &r
);
787 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
789 c
->max
= muldiv32(a
->max
, k
, b
->min
, &r
);
794 c
->openmax
= (a
->openmax
|| b
->openmin
);
806 * snd_interval_ratnum - refine the interval value
807 * @i: interval to refine
808 * @rats_count: number of ratnum_t
809 * @rats: ratnum_t array
810 * @nump: pointer to store the resultant numerator
811 * @denp: pointer to store the resultant denominator
813 * Returns non-zero if the value is changed, zero if not changed.
815 int snd_interval_ratnum(struct snd_interval
*i
,
816 unsigned int rats_count
, struct snd_ratnum
*rats
,
817 unsigned int *nump
, unsigned int *denp
)
819 unsigned int best_num
, best_den
;
822 struct snd_interval t
;
824 unsigned int result_num
, result_den
;
827 best_num
= best_den
= best_diff
= 0;
828 for (k
= 0; k
< rats_count
; ++k
) {
829 unsigned int num
= rats
[k
].num
;
831 unsigned int q
= i
->min
;
835 den
= div_up(num
, q
);
836 if (den
< rats
[k
].den_min
)
838 if (den
> rats
[k
].den_max
)
839 den
= rats
[k
].den_max
;
842 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
846 diff
= num
- q
* den
;
850 diff
* best_den
< best_diff
* den
) {
860 t
.min
= div_down(best_num
, best_den
);
861 t
.openmin
= !!(best_num
% best_den
);
863 result_num
= best_num
;
864 result_diff
= best_diff
;
865 result_den
= best_den
;
866 best_num
= best_den
= best_diff
= 0;
867 for (k
= 0; k
< rats_count
; ++k
) {
868 unsigned int num
= rats
[k
].num
;
870 unsigned int q
= i
->max
;
876 den
= div_down(num
, q
);
877 if (den
> rats
[k
].den_max
)
879 if (den
< rats
[k
].den_min
)
880 den
= rats
[k
].den_min
;
883 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
885 den
+= rats
[k
].den_step
- r
;
887 diff
= q
* den
- num
;
891 diff
* best_den
< best_diff
* den
) {
901 t
.max
= div_up(best_num
, best_den
);
902 t
.openmax
= !!(best_num
% best_den
);
904 err
= snd_interval_refine(i
, &t
);
908 if (snd_interval_single(i
)) {
909 if (best_diff
* result_den
< result_diff
* best_den
) {
910 result_num
= best_num
;
911 result_den
= best_den
;
921 EXPORT_SYMBOL(snd_interval_ratnum
);
924 * snd_interval_ratden - refine the interval value
925 * @i: interval to refine
926 * @rats_count: number of struct ratden
927 * @rats: struct ratden array
928 * @nump: pointer to store the resultant numerator
929 * @denp: pointer to store the resultant denominator
931 * Returns non-zero if the value is changed, zero if not changed.
933 static int snd_interval_ratden(struct snd_interval
*i
,
934 unsigned int rats_count
, struct snd_ratden
*rats
,
935 unsigned int *nump
, unsigned int *denp
)
937 unsigned int best_num
, best_diff
, best_den
;
939 struct snd_interval t
;
942 best_num
= best_den
= best_diff
= 0;
943 for (k
= 0; k
< rats_count
; ++k
) {
945 unsigned int den
= rats
[k
].den
;
946 unsigned int q
= i
->min
;
949 if (num
> rats
[k
].num_max
)
951 if (num
< rats
[k
].num_min
)
952 num
= rats
[k
].num_max
;
955 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
957 num
+= rats
[k
].num_step
- r
;
959 diff
= num
- q
* den
;
961 diff
* best_den
< best_diff
* den
) {
971 t
.min
= div_down(best_num
, best_den
);
972 t
.openmin
= !!(best_num
% best_den
);
974 best_num
= best_den
= best_diff
= 0;
975 for (k
= 0; k
< rats_count
; ++k
) {
977 unsigned int den
= rats
[k
].den
;
978 unsigned int q
= i
->max
;
981 if (num
< rats
[k
].num_min
)
983 if (num
> rats
[k
].num_max
)
984 num
= rats
[k
].num_max
;
987 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
991 diff
= q
* den
- num
;
993 diff
* best_den
< best_diff
* den
) {
1003 t
.max
= div_up(best_num
, best_den
);
1004 t
.openmax
= !!(best_num
% best_den
);
1006 err
= snd_interval_refine(i
, &t
);
1010 if (snd_interval_single(i
)) {
1020 * snd_interval_list - refine the interval value from the list
1021 * @i: the interval value to refine
1022 * @count: the number of elements in the list
1023 * @list: the value list
1024 * @mask: the bit-mask to evaluate
1026 * Refines the interval value from the list.
1027 * When mask is non-zero, only the elements corresponding to bit 1 are
1030 * Returns non-zero if the value is changed, zero if not changed.
1032 int snd_interval_list(struct snd_interval
*i
, unsigned int count
,
1033 const unsigned int *list
, unsigned int mask
)
1036 struct snd_interval list_range
;
1042 snd_interval_any(&list_range
);
1043 list_range
.min
= UINT_MAX
;
1045 for (k
= 0; k
< count
; k
++) {
1046 if (mask
&& !(mask
& (1 << k
)))
1048 if (!snd_interval_test(i
, list
[k
]))
1050 list_range
.min
= min(list_range
.min
, list
[k
]);
1051 list_range
.max
= max(list_range
.max
, list
[k
]);
1053 return snd_interval_refine(i
, &list_range
);
1056 EXPORT_SYMBOL(snd_interval_list
);
1058 static int snd_interval_step(struct snd_interval
*i
, unsigned int min
, unsigned int step
)
1062 n
= (i
->min
- min
) % step
;
1063 if (n
!= 0 || i
->openmin
) {
1067 n
= (i
->max
- min
) % step
;
1068 if (n
!= 0 || i
->openmax
) {
1072 if (snd_interval_checkempty(i
)) {
1079 /* Info constraints helpers */
1082 * snd_pcm_hw_rule_add - add the hw-constraint rule
1083 * @runtime: the pcm runtime instance
1084 * @cond: condition bits
1085 * @var: the variable to evaluate
1086 * @func: the evaluation function
1087 * @private: the private data pointer passed to function
1088 * @dep: the dependent variables
1090 * Returns zero if successful, or a negative error code on failure.
1092 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
, unsigned int cond
,
1094 snd_pcm_hw_rule_func_t func
, void *private,
1097 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1098 struct snd_pcm_hw_rule
*c
;
1101 va_start(args
, dep
);
1102 if (constrs
->rules_num
>= constrs
->rules_all
) {
1103 struct snd_pcm_hw_rule
*new;
1104 unsigned int new_rules
= constrs
->rules_all
+ 16;
1105 new = kcalloc(new_rules
, sizeof(*c
), GFP_KERNEL
);
1110 if (constrs
->rules
) {
1111 memcpy(new, constrs
->rules
,
1112 constrs
->rules_num
* sizeof(*c
));
1113 kfree(constrs
->rules
);
1115 constrs
->rules
= new;
1116 constrs
->rules_all
= new_rules
;
1118 c
= &constrs
->rules
[constrs
->rules_num
];
1122 c
->private = private;
1125 if (snd_BUG_ON(k
>= ARRAY_SIZE(c
->deps
))) {
1132 dep
= va_arg(args
, int);
1134 constrs
->rules_num
++;
1139 EXPORT_SYMBOL(snd_pcm_hw_rule_add
);
1142 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1143 * @runtime: PCM runtime instance
1144 * @var: hw_params variable to apply the mask
1145 * @mask: the bitmap mask
1147 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1149 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1152 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1153 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1154 *maskp
->bits
&= mask
;
1155 memset(maskp
->bits
+ 1, 0, (SNDRV_MASK_MAX
-32) / 8); /* clear rest */
1156 if (*maskp
->bits
== 0)
1162 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1163 * @runtime: PCM runtime instance
1164 * @var: hw_params variable to apply the mask
1165 * @mask: the 64bit bitmap mask
1167 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1169 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1172 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1173 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1174 maskp
->bits
[0] &= (u_int32_t
)mask
;
1175 maskp
->bits
[1] &= (u_int32_t
)(mask
>> 32);
1176 memset(maskp
->bits
+ 2, 0, (SNDRV_MASK_MAX
-64) / 8); /* clear rest */
1177 if (! maskp
->bits
[0] && ! maskp
->bits
[1])
1183 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1184 * @runtime: PCM runtime instance
1185 * @var: hw_params variable to apply the integer constraint
1187 * Apply the constraint of integer to an interval parameter.
1189 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
)
1191 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1192 return snd_interval_setinteger(constrs_interval(constrs
, var
));
1195 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer
);
1198 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1199 * @runtime: PCM runtime instance
1200 * @var: hw_params variable to apply the range
1201 * @min: the minimal value
1202 * @max: the maximal value
1204 * Apply the min/max range constraint to an interval parameter.
1206 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1207 unsigned int min
, unsigned int max
)
1209 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1210 struct snd_interval t
;
1213 t
.openmin
= t
.openmax
= 0;
1215 return snd_interval_refine(constrs_interval(constrs
, var
), &t
);
1218 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax
);
1220 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params
*params
,
1221 struct snd_pcm_hw_rule
*rule
)
1223 struct snd_pcm_hw_constraint_list
*list
= rule
->private;
1224 return snd_interval_list(hw_param_interval(params
, rule
->var
), list
->count
, list
->list
, list
->mask
);
1229 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1230 * @runtime: PCM runtime instance
1231 * @cond: condition bits
1232 * @var: hw_params variable to apply the list constraint
1235 * Apply the list of constraints to an interval parameter.
1237 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
1239 snd_pcm_hw_param_t var
,
1240 struct snd_pcm_hw_constraint_list
*l
)
1242 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1243 snd_pcm_hw_rule_list
, l
,
1247 EXPORT_SYMBOL(snd_pcm_hw_constraint_list
);
1249 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params
*params
,
1250 struct snd_pcm_hw_rule
*rule
)
1252 struct snd_pcm_hw_constraint_ratnums
*r
= rule
->private;
1253 unsigned int num
= 0, den
= 0;
1255 err
= snd_interval_ratnum(hw_param_interval(params
, rule
->var
),
1256 r
->nrats
, r
->rats
, &num
, &den
);
1257 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1258 params
->rate_num
= num
;
1259 params
->rate_den
= den
;
1265 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1266 * @runtime: PCM runtime instance
1267 * @cond: condition bits
1268 * @var: hw_params variable to apply the ratnums constraint
1269 * @r: struct snd_ratnums constriants
1271 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
1273 snd_pcm_hw_param_t var
,
1274 struct snd_pcm_hw_constraint_ratnums
*r
)
1276 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1277 snd_pcm_hw_rule_ratnums
, r
,
1281 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums
);
1283 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params
*params
,
1284 struct snd_pcm_hw_rule
*rule
)
1286 struct snd_pcm_hw_constraint_ratdens
*r
= rule
->private;
1287 unsigned int num
= 0, den
= 0;
1288 int err
= snd_interval_ratden(hw_param_interval(params
, rule
->var
),
1289 r
->nrats
, r
->rats
, &num
, &den
);
1290 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1291 params
->rate_num
= num
;
1292 params
->rate_den
= den
;
1298 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1299 * @runtime: PCM runtime instance
1300 * @cond: condition bits
1301 * @var: hw_params variable to apply the ratdens constraint
1302 * @r: struct snd_ratdens constriants
1304 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
1306 snd_pcm_hw_param_t var
,
1307 struct snd_pcm_hw_constraint_ratdens
*r
)
1309 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1310 snd_pcm_hw_rule_ratdens
, r
,
1314 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens
);
1316 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params
*params
,
1317 struct snd_pcm_hw_rule
*rule
)
1319 unsigned int l
= (unsigned long) rule
->private;
1320 int width
= l
& 0xffff;
1321 unsigned int msbits
= l
>> 16;
1322 struct snd_interval
*i
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_SAMPLE_BITS
);
1323 if (snd_interval_single(i
) && snd_interval_value(i
) == width
)
1324 params
->msbits
= msbits
;
1329 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1330 * @runtime: PCM runtime instance
1331 * @cond: condition bits
1332 * @width: sample bits width
1333 * @msbits: msbits width
1335 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
1338 unsigned int msbits
)
1340 unsigned long l
= (msbits
<< 16) | width
;
1341 return snd_pcm_hw_rule_add(runtime
, cond
, -1,
1342 snd_pcm_hw_rule_msbits
,
1344 SNDRV_PCM_HW_PARAM_SAMPLE_BITS
, -1);
1347 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits
);
1349 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params
*params
,
1350 struct snd_pcm_hw_rule
*rule
)
1352 unsigned long step
= (unsigned long) rule
->private;
1353 return snd_interval_step(hw_param_interval(params
, rule
->var
), 0, step
);
1357 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1358 * @runtime: PCM runtime instance
1359 * @cond: condition bits
1360 * @var: hw_params variable to apply the step constraint
1363 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
1365 snd_pcm_hw_param_t var
,
1368 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1369 snd_pcm_hw_rule_step
, (void *) step
,
1373 EXPORT_SYMBOL(snd_pcm_hw_constraint_step
);
1375 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params
*params
, struct snd_pcm_hw_rule
*rule
)
1377 static unsigned int pow2_sizes
[] = {
1378 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1379 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1380 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1381 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1383 return snd_interval_list(hw_param_interval(params
, rule
->var
),
1384 ARRAY_SIZE(pow2_sizes
), pow2_sizes
, 0);
1388 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1389 * @runtime: PCM runtime instance
1390 * @cond: condition bits
1391 * @var: hw_params variable to apply the power-of-2 constraint
1393 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
1395 snd_pcm_hw_param_t var
)
1397 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1398 snd_pcm_hw_rule_pow2
, NULL
,
1402 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2
);
1404 static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params
*params
,
1405 struct snd_pcm_hw_rule
*rule
)
1407 unsigned int base_rate
= (unsigned int)(uintptr_t)rule
->private;
1408 struct snd_interval
*rate
;
1410 rate
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
1411 return snd_interval_list(rate
, 1, &base_rate
, 0);
1415 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1416 * @runtime: PCM runtime instance
1417 * @base_rate: the rate at which the hardware does not resample
1419 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime
*runtime
,
1420 unsigned int base_rate
)
1422 return snd_pcm_hw_rule_add(runtime
, SNDRV_PCM_HW_PARAMS_NORESAMPLE
,
1423 SNDRV_PCM_HW_PARAM_RATE
,
1424 snd_pcm_hw_rule_noresample_func
,
1425 (void *)(uintptr_t)base_rate
,
1426 SNDRV_PCM_HW_PARAM_RATE
, -1);
1428 EXPORT_SYMBOL(snd_pcm_hw_rule_noresample
);
1430 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params
*params
,
1431 snd_pcm_hw_param_t var
)
1433 if (hw_is_mask(var
)) {
1434 snd_mask_any(hw_param_mask(params
, var
));
1435 params
->cmask
|= 1 << var
;
1436 params
->rmask
|= 1 << var
;
1439 if (hw_is_interval(var
)) {
1440 snd_interval_any(hw_param_interval(params
, var
));
1441 params
->cmask
|= 1 << var
;
1442 params
->rmask
|= 1 << var
;
1448 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
)
1451 memset(params
, 0, sizeof(*params
));
1452 for (k
= SNDRV_PCM_HW_PARAM_FIRST_MASK
; k
<= SNDRV_PCM_HW_PARAM_LAST_MASK
; k
++)
1453 _snd_pcm_hw_param_any(params
, k
);
1454 for (k
= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
; k
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
; k
++)
1455 _snd_pcm_hw_param_any(params
, k
);
1459 EXPORT_SYMBOL(_snd_pcm_hw_params_any
);
1462 * snd_pcm_hw_param_value - return @params field @var value
1463 * @params: the hw_params instance
1464 * @var: parameter to retrieve
1465 * @dir: pointer to the direction (-1,0,1) or %NULL
1467 * Return the value for field @var if it's fixed in configuration space
1468 * defined by @params. Return -%EINVAL otherwise.
1470 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
1471 snd_pcm_hw_param_t var
, int *dir
)
1473 if (hw_is_mask(var
)) {
1474 const struct snd_mask
*mask
= hw_param_mask_c(params
, var
);
1475 if (!snd_mask_single(mask
))
1479 return snd_mask_value(mask
);
1481 if (hw_is_interval(var
)) {
1482 const struct snd_interval
*i
= hw_param_interval_c(params
, var
);
1483 if (!snd_interval_single(i
))
1487 return snd_interval_value(i
);
1492 EXPORT_SYMBOL(snd_pcm_hw_param_value
);
1494 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
,
1495 snd_pcm_hw_param_t var
)
1497 if (hw_is_mask(var
)) {
1498 snd_mask_none(hw_param_mask(params
, var
));
1499 params
->cmask
|= 1 << var
;
1500 params
->rmask
|= 1 << var
;
1501 } else if (hw_is_interval(var
)) {
1502 snd_interval_none(hw_param_interval(params
, var
));
1503 params
->cmask
|= 1 << var
;
1504 params
->rmask
|= 1 << var
;
1510 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty
);
1512 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params
*params
,
1513 snd_pcm_hw_param_t var
)
1516 if (hw_is_mask(var
))
1517 changed
= snd_mask_refine_first(hw_param_mask(params
, var
));
1518 else if (hw_is_interval(var
))
1519 changed
= snd_interval_refine_first(hw_param_interval(params
, var
));
1523 params
->cmask
|= 1 << var
;
1524 params
->rmask
|= 1 << var
;
1531 * snd_pcm_hw_param_first - refine config space and return minimum value
1532 * @pcm: PCM instance
1533 * @params: the hw_params instance
1534 * @var: parameter to retrieve
1535 * @dir: pointer to the direction (-1,0,1) or %NULL
1537 * Inside configuration space defined by @params remove from @var all
1538 * values > minimum. Reduce configuration space accordingly.
1539 * Return the minimum.
1541 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
1542 struct snd_pcm_hw_params
*params
,
1543 snd_pcm_hw_param_t var
, int *dir
)
1545 int changed
= _snd_pcm_hw_param_first(params
, var
);
1548 if (params
->rmask
) {
1549 int err
= snd_pcm_hw_refine(pcm
, params
);
1550 if (snd_BUG_ON(err
< 0))
1553 return snd_pcm_hw_param_value(params
, var
, dir
);
1556 EXPORT_SYMBOL(snd_pcm_hw_param_first
);
1558 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params
*params
,
1559 snd_pcm_hw_param_t var
)
1562 if (hw_is_mask(var
))
1563 changed
= snd_mask_refine_last(hw_param_mask(params
, var
));
1564 else if (hw_is_interval(var
))
1565 changed
= snd_interval_refine_last(hw_param_interval(params
, var
));
1569 params
->cmask
|= 1 << var
;
1570 params
->rmask
|= 1 << var
;
1577 * snd_pcm_hw_param_last - refine config space and return maximum value
1578 * @pcm: PCM instance
1579 * @params: the hw_params instance
1580 * @var: parameter to retrieve
1581 * @dir: pointer to the direction (-1,0,1) or %NULL
1583 * Inside configuration space defined by @params remove from @var all
1584 * values < maximum. Reduce configuration space accordingly.
1585 * Return the maximum.
1587 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
1588 struct snd_pcm_hw_params
*params
,
1589 snd_pcm_hw_param_t var
, int *dir
)
1591 int changed
= _snd_pcm_hw_param_last(params
, var
);
1594 if (params
->rmask
) {
1595 int err
= snd_pcm_hw_refine(pcm
, params
);
1596 if (snd_BUG_ON(err
< 0))
1599 return snd_pcm_hw_param_value(params
, var
, dir
);
1602 EXPORT_SYMBOL(snd_pcm_hw_param_last
);
1605 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1606 * @pcm: PCM instance
1607 * @params: the hw_params instance
1609 * Choose one configuration from configuration space defined by @params.
1610 * The configuration chosen is that obtained fixing in this order:
1611 * first access, first format, first subformat, min channels,
1612 * min rate, min period time, max buffer size, min tick time
1614 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*pcm
,
1615 struct snd_pcm_hw_params
*params
)
1617 static int vars
[] = {
1618 SNDRV_PCM_HW_PARAM_ACCESS
,
1619 SNDRV_PCM_HW_PARAM_FORMAT
,
1620 SNDRV_PCM_HW_PARAM_SUBFORMAT
,
1621 SNDRV_PCM_HW_PARAM_CHANNELS
,
1622 SNDRV_PCM_HW_PARAM_RATE
,
1623 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1624 SNDRV_PCM_HW_PARAM_BUFFER_SIZE
,
1625 SNDRV_PCM_HW_PARAM_TICK_TIME
,
1630 for (v
= vars
; *v
!= -1; v
++) {
1631 if (*v
!= SNDRV_PCM_HW_PARAM_BUFFER_SIZE
)
1632 err
= snd_pcm_hw_param_first(pcm
, params
, *v
, NULL
);
1634 err
= snd_pcm_hw_param_last(pcm
, params
, *v
, NULL
);
1635 if (snd_BUG_ON(err
< 0))
1641 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream
*substream
,
1644 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1645 unsigned long flags
;
1646 snd_pcm_stream_lock_irqsave(substream
, flags
);
1647 if (snd_pcm_running(substream
) &&
1648 snd_pcm_update_hw_ptr(substream
) >= 0)
1649 runtime
->status
->hw_ptr
%= runtime
->buffer_size
;
1651 runtime
->status
->hw_ptr
= 0;
1652 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1656 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream
*substream
,
1659 struct snd_pcm_channel_info
*info
= arg
;
1660 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1662 if (!(runtime
->info
& SNDRV_PCM_INFO_MMAP
)) {
1666 width
= snd_pcm_format_physical_width(runtime
->format
);
1670 switch (runtime
->access
) {
1671 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
:
1672 case SNDRV_PCM_ACCESS_RW_INTERLEAVED
:
1673 info
->first
= info
->channel
* width
;
1674 info
->step
= runtime
->channels
* width
;
1676 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED
:
1677 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
:
1679 size_t size
= runtime
->dma_bytes
/ runtime
->channels
;
1680 info
->first
= info
->channel
* size
* 8;
1691 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream
*substream
,
1694 struct snd_pcm_hw_params
*params
= arg
;
1695 snd_pcm_format_t format
;
1696 int channels
, width
;
1698 params
->fifo_size
= substream
->runtime
->hw
.fifo_size
;
1699 if (!(substream
->runtime
->hw
.info
& SNDRV_PCM_INFO_FIFO_IN_FRAMES
)) {
1700 format
= params_format(params
);
1701 channels
= params_channels(params
);
1702 width
= snd_pcm_format_physical_width(format
);
1703 params
->fifo_size
/= width
* channels
;
1709 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1710 * @substream: the pcm substream instance
1711 * @cmd: ioctl command
1712 * @arg: ioctl argument
1714 * Processes the generic ioctl commands for PCM.
1715 * Can be passed as the ioctl callback for PCM ops.
1717 * Returns zero if successful, or a negative error code on failure.
1719 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
1720 unsigned int cmd
, void *arg
)
1723 case SNDRV_PCM_IOCTL1_INFO
:
1725 case SNDRV_PCM_IOCTL1_RESET
:
1726 return snd_pcm_lib_ioctl_reset(substream
, arg
);
1727 case SNDRV_PCM_IOCTL1_CHANNEL_INFO
:
1728 return snd_pcm_lib_ioctl_channel_info(substream
, arg
);
1729 case SNDRV_PCM_IOCTL1_FIFO_SIZE
:
1730 return snd_pcm_lib_ioctl_fifo_size(substream
, arg
);
1735 EXPORT_SYMBOL(snd_pcm_lib_ioctl
);
1738 * snd_pcm_period_elapsed - update the pcm status for the next period
1739 * @substream: the pcm substream instance
1741 * This function is called from the interrupt handler when the
1742 * PCM has processed the period size. It will update the current
1743 * pointer, wake up sleepers, etc.
1745 * Even if more than one periods have elapsed since the last call, you
1746 * have to call this only once.
1748 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
)
1750 struct snd_pcm_runtime
*runtime
;
1751 unsigned long flags
;
1753 if (PCM_RUNTIME_CHECK(substream
))
1755 runtime
= substream
->runtime
;
1757 if (runtime
->transfer_ack_begin
)
1758 runtime
->transfer_ack_begin(substream
);
1760 snd_pcm_stream_lock_irqsave(substream
, flags
);
1761 if (!snd_pcm_running(substream
) ||
1762 snd_pcm_update_hw_ptr0(substream
, 1) < 0)
1765 if (substream
->timer_running
)
1766 snd_timer_interrupt(substream
->timer
, 1);
1768 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1769 if (runtime
->transfer_ack_end
)
1770 runtime
->transfer_ack_end(substream
);
1771 kill_fasync(&runtime
->fasync
, SIGIO
, POLL_IN
);
1774 EXPORT_SYMBOL(snd_pcm_period_elapsed
);
1777 * Wait until avail_min data becomes available
1778 * Returns a negative error code if any error occurs during operation.
1779 * The available space is stored on availp. When err = 0 and avail = 0
1780 * on the capture stream, it indicates the stream is in DRAINING state.
1782 static int wait_for_avail(struct snd_pcm_substream
*substream
,
1783 snd_pcm_uframes_t
*availp
)
1785 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1786 int is_playback
= substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
;
1789 snd_pcm_uframes_t avail
= 0;
1790 long wait_time
, tout
;
1792 init_waitqueue_entry(&wait
, current
);
1793 set_current_state(TASK_INTERRUPTIBLE
);
1794 add_wait_queue(&runtime
->tsleep
, &wait
);
1796 if (runtime
->no_period_wakeup
)
1797 wait_time
= MAX_SCHEDULE_TIMEOUT
;
1800 if (runtime
->rate
) {
1801 long t
= runtime
->period_size
* 2 / runtime
->rate
;
1802 wait_time
= max(t
, wait_time
);
1804 wait_time
= msecs_to_jiffies(wait_time
* 1000);
1808 if (signal_pending(current
)) {
1814 * We need to check if space became available already
1815 * (and thus the wakeup happened already) first to close
1816 * the race of space already having become available.
1817 * This check must happen after been added to the waitqueue
1818 * and having current state be INTERRUPTIBLE.
1821 avail
= snd_pcm_playback_avail(runtime
);
1823 avail
= snd_pcm_capture_avail(runtime
);
1824 if (avail
>= runtime
->twake
)
1826 snd_pcm_stream_unlock_irq(substream
);
1828 tout
= schedule_timeout(wait_time
);
1830 snd_pcm_stream_lock_irq(substream
);
1831 set_current_state(TASK_INTERRUPTIBLE
);
1832 switch (runtime
->status
->state
) {
1833 case SNDRV_PCM_STATE_SUSPENDED
:
1836 case SNDRV_PCM_STATE_XRUN
:
1839 case SNDRV_PCM_STATE_DRAINING
:
1843 avail
= 0; /* indicate draining */
1845 case SNDRV_PCM_STATE_OPEN
:
1846 case SNDRV_PCM_STATE_SETUP
:
1847 case SNDRV_PCM_STATE_DISCONNECTED
:
1852 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1853 is_playback
? "playback" : "capture");
1859 set_current_state(TASK_RUNNING
);
1860 remove_wait_queue(&runtime
->tsleep
, &wait
);
1865 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream
*substream
,
1867 unsigned long data
, unsigned int off
,
1868 snd_pcm_uframes_t frames
)
1870 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1872 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1873 if (substream
->ops
->copy
) {
1874 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1877 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1878 if (copy_from_user(hwbuf
, buf
, frames_to_bytes(runtime
, frames
)))
1884 typedef int (*transfer_f
)(struct snd_pcm_substream
*substream
, unsigned int hwoff
,
1885 unsigned long data
, unsigned int off
,
1886 snd_pcm_uframes_t size
);
1888 static snd_pcm_sframes_t
snd_pcm_lib_write1(struct snd_pcm_substream
*substream
,
1890 snd_pcm_uframes_t size
,
1892 transfer_f transfer
)
1894 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1895 snd_pcm_uframes_t xfer
= 0;
1896 snd_pcm_uframes_t offset
= 0;
1902 snd_pcm_stream_lock_irq(substream
);
1903 switch (runtime
->status
->state
) {
1904 case SNDRV_PCM_STATE_PREPARED
:
1905 case SNDRV_PCM_STATE_RUNNING
:
1906 case SNDRV_PCM_STATE_PAUSED
:
1908 case SNDRV_PCM_STATE_XRUN
:
1911 case SNDRV_PCM_STATE_SUSPENDED
:
1919 runtime
->twake
= runtime
->control
->avail_min
? : 1;
1921 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1922 snd_pcm_uframes_t avail
;
1923 snd_pcm_uframes_t cont
;
1924 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1925 snd_pcm_update_hw_ptr(substream
);
1926 avail
= snd_pcm_playback_avail(runtime
);
1932 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
1933 runtime
->control
->avail_min
? : 1);
1934 err
= wait_for_avail(substream
, &avail
);
1938 frames
= size
> avail
? avail
: size
;
1939 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
1942 if (snd_BUG_ON(!frames
)) {
1944 snd_pcm_stream_unlock_irq(substream
);
1947 appl_ptr
= runtime
->control
->appl_ptr
;
1948 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
1949 snd_pcm_stream_unlock_irq(substream
);
1950 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
1951 snd_pcm_stream_lock_irq(substream
);
1954 switch (runtime
->status
->state
) {
1955 case SNDRV_PCM_STATE_XRUN
:
1958 case SNDRV_PCM_STATE_SUSPENDED
:
1965 if (appl_ptr
>= runtime
->boundary
)
1966 appl_ptr
-= runtime
->boundary
;
1967 runtime
->control
->appl_ptr
= appl_ptr
;
1968 if (substream
->ops
->ack
)
1969 substream
->ops
->ack(substream
);
1974 if (runtime
->status
->state
== SNDRV_PCM_STATE_PREPARED
&&
1975 snd_pcm_playback_hw_avail(runtime
) >= (snd_pcm_sframes_t
)runtime
->start_threshold
) {
1976 err
= snd_pcm_start(substream
);
1983 if (xfer
> 0 && err
>= 0)
1984 snd_pcm_update_state(substream
, runtime
);
1985 snd_pcm_stream_unlock_irq(substream
);
1986 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
1989 /* sanity-check for read/write methods */
1990 static int pcm_sanity_check(struct snd_pcm_substream
*substream
)
1992 struct snd_pcm_runtime
*runtime
;
1993 if (PCM_RUNTIME_CHECK(substream
))
1995 runtime
= substream
->runtime
;
1996 if (snd_BUG_ON(!substream
->ops
->copy
&& !runtime
->dma_area
))
1998 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2003 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
, const void __user
*buf
, snd_pcm_uframes_t size
)
2005 struct snd_pcm_runtime
*runtime
;
2009 err
= pcm_sanity_check(substream
);
2012 runtime
= substream
->runtime
;
2013 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2015 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
&&
2016 runtime
->channels
> 1)
2018 return snd_pcm_lib_write1(substream
, (unsigned long)buf
, size
, nonblock
,
2019 snd_pcm_lib_write_transfer
);
2022 EXPORT_SYMBOL(snd_pcm_lib_write
);
2024 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream
*substream
,
2026 unsigned long data
, unsigned int off
,
2027 snd_pcm_uframes_t frames
)
2029 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2031 void __user
**bufs
= (void __user
**)data
;
2032 int channels
= runtime
->channels
;
2034 if (substream
->ops
->copy
) {
2035 if (snd_BUG_ON(!substream
->ops
->silence
))
2037 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2038 if (*bufs
== NULL
) {
2039 if ((err
= substream
->ops
->silence(substream
, c
, hwoff
, frames
)) < 0)
2042 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2043 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2048 /* default transfer behaviour */
2049 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
2050 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2051 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2052 if (*bufs
== NULL
) {
2053 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, frames
);
2055 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2056 if (copy_from_user(hwbuf
, buf
, samples_to_bytes(runtime
, frames
)))
2064 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
2066 snd_pcm_uframes_t frames
)
2068 struct snd_pcm_runtime
*runtime
;
2072 err
= pcm_sanity_check(substream
);
2075 runtime
= substream
->runtime
;
2076 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2078 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2080 return snd_pcm_lib_write1(substream
, (unsigned long)bufs
, frames
,
2081 nonblock
, snd_pcm_lib_writev_transfer
);
2084 EXPORT_SYMBOL(snd_pcm_lib_writev
);
2086 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream
*substream
,
2088 unsigned long data
, unsigned int off
,
2089 snd_pcm_uframes_t frames
)
2091 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2093 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
2094 if (substream
->ops
->copy
) {
2095 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
2098 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
2099 if (copy_to_user(buf
, hwbuf
, frames_to_bytes(runtime
, frames
)))
2105 static snd_pcm_sframes_t
snd_pcm_lib_read1(struct snd_pcm_substream
*substream
,
2107 snd_pcm_uframes_t size
,
2109 transfer_f transfer
)
2111 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2112 snd_pcm_uframes_t xfer
= 0;
2113 snd_pcm_uframes_t offset
= 0;
2119 snd_pcm_stream_lock_irq(substream
);
2120 switch (runtime
->status
->state
) {
2121 case SNDRV_PCM_STATE_PREPARED
:
2122 if (size
>= runtime
->start_threshold
) {
2123 err
= snd_pcm_start(substream
);
2128 case SNDRV_PCM_STATE_DRAINING
:
2129 case SNDRV_PCM_STATE_RUNNING
:
2130 case SNDRV_PCM_STATE_PAUSED
:
2132 case SNDRV_PCM_STATE_XRUN
:
2135 case SNDRV_PCM_STATE_SUSPENDED
:
2143 runtime
->twake
= runtime
->control
->avail_min
? : 1;
2145 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
2146 snd_pcm_uframes_t avail
;
2147 snd_pcm_uframes_t cont
;
2148 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
2149 snd_pcm_update_hw_ptr(substream
);
2150 avail
= snd_pcm_capture_avail(runtime
);
2152 if (runtime
->status
->state
==
2153 SNDRV_PCM_STATE_DRAINING
) {
2154 snd_pcm_stop(substream
, SNDRV_PCM_STATE_SETUP
);
2161 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
2162 runtime
->control
->avail_min
? : 1);
2163 err
= wait_for_avail(substream
, &avail
);
2167 continue; /* draining */
2169 frames
= size
> avail
? avail
: size
;
2170 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
2173 if (snd_BUG_ON(!frames
)) {
2175 snd_pcm_stream_unlock_irq(substream
);
2178 appl_ptr
= runtime
->control
->appl_ptr
;
2179 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2180 snd_pcm_stream_unlock_irq(substream
);
2181 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
2182 snd_pcm_stream_lock_irq(substream
);
2185 switch (runtime
->status
->state
) {
2186 case SNDRV_PCM_STATE_XRUN
:
2189 case SNDRV_PCM_STATE_SUSPENDED
:
2196 if (appl_ptr
>= runtime
->boundary
)
2197 appl_ptr
-= runtime
->boundary
;
2198 runtime
->control
->appl_ptr
= appl_ptr
;
2199 if (substream
->ops
->ack
)
2200 substream
->ops
->ack(substream
);
2208 if (xfer
> 0 && err
>= 0)
2209 snd_pcm_update_state(substream
, runtime
);
2210 snd_pcm_stream_unlock_irq(substream
);
2211 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2214 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
, void __user
*buf
, snd_pcm_uframes_t size
)
2216 struct snd_pcm_runtime
*runtime
;
2220 err
= pcm_sanity_check(substream
);
2223 runtime
= substream
->runtime
;
2224 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2225 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
2227 return snd_pcm_lib_read1(substream
, (unsigned long)buf
, size
, nonblock
, snd_pcm_lib_read_transfer
);
2230 EXPORT_SYMBOL(snd_pcm_lib_read
);
2232 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream
*substream
,
2234 unsigned long data
, unsigned int off
,
2235 snd_pcm_uframes_t frames
)
2237 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2239 void __user
**bufs
= (void __user
**)data
;
2240 int channels
= runtime
->channels
;
2242 if (substream
->ops
->copy
) {
2243 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2247 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2248 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2252 snd_pcm_uframes_t dma_csize
= runtime
->dma_bytes
/ channels
;
2253 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2259 hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2260 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2261 if (copy_to_user(buf
, hwbuf
, samples_to_bytes(runtime
, frames
)))
2268 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
2270 snd_pcm_uframes_t frames
)
2272 struct snd_pcm_runtime
*runtime
;
2276 err
= pcm_sanity_check(substream
);
2279 runtime
= substream
->runtime
;
2280 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2283 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2284 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2286 return snd_pcm_lib_read1(substream
, (unsigned long)bufs
, frames
, nonblock
, snd_pcm_lib_readv_transfer
);
2289 EXPORT_SYMBOL(snd_pcm_lib_readv
);