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/tlv.h>
30 #include <sound/info.h>
31 #include <sound/pcm.h>
32 #include <sound/pcm_params.h>
33 #include <sound/timer.h>
36 * fill ring buffer with silence
37 * runtime->silence_start: starting pointer to silence area
38 * runtime->silence_filled: size filled with silence
39 * runtime->silence_threshold: threshold from application
40 * runtime->silence_size: maximal size from application
42 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
44 void snd_pcm_playback_silence(struct snd_pcm_substream
*substream
, snd_pcm_uframes_t new_hw_ptr
)
46 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
47 snd_pcm_uframes_t frames
, ofs
, transfer
;
49 if (runtime
->silence_size
< runtime
->boundary
) {
50 snd_pcm_sframes_t noise_dist
, n
;
51 if (runtime
->silence_start
!= runtime
->control
->appl_ptr
) {
52 n
= runtime
->control
->appl_ptr
- runtime
->silence_start
;
54 n
+= runtime
->boundary
;
55 if ((snd_pcm_uframes_t
)n
< runtime
->silence_filled
)
56 runtime
->silence_filled
-= n
;
58 runtime
->silence_filled
= 0;
59 runtime
->silence_start
= runtime
->control
->appl_ptr
;
61 if (runtime
->silence_filled
>= runtime
->buffer_size
)
63 noise_dist
= snd_pcm_playback_hw_avail(runtime
) + runtime
->silence_filled
;
64 if (noise_dist
>= (snd_pcm_sframes_t
) runtime
->silence_threshold
)
66 frames
= runtime
->silence_threshold
- noise_dist
;
67 if (frames
> runtime
->silence_size
)
68 frames
= runtime
->silence_size
;
70 if (new_hw_ptr
== ULONG_MAX
) { /* initialization */
71 snd_pcm_sframes_t avail
= snd_pcm_playback_hw_avail(runtime
);
72 if (avail
> runtime
->buffer_size
)
73 avail
= runtime
->buffer_size
;
74 runtime
->silence_filled
= avail
> 0 ? avail
: 0;
75 runtime
->silence_start
= (runtime
->status
->hw_ptr
+
76 runtime
->silence_filled
) %
79 ofs
= runtime
->status
->hw_ptr
;
80 frames
= new_hw_ptr
- ofs
;
81 if ((snd_pcm_sframes_t
)frames
< 0)
82 frames
+= runtime
->boundary
;
83 runtime
->silence_filled
-= frames
;
84 if ((snd_pcm_sframes_t
)runtime
->silence_filled
< 0) {
85 runtime
->silence_filled
= 0;
86 runtime
->silence_start
= new_hw_ptr
;
88 runtime
->silence_start
= ofs
;
91 frames
= runtime
->buffer_size
- runtime
->silence_filled
;
93 if (snd_BUG_ON(frames
> runtime
->buffer_size
))
97 ofs
= runtime
->silence_start
% runtime
->buffer_size
;
99 transfer
= ofs
+ frames
> runtime
->buffer_size
? runtime
->buffer_size
- ofs
: frames
;
100 if (runtime
->access
== SNDRV_PCM_ACCESS_RW_INTERLEAVED
||
101 runtime
->access
== SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
) {
102 if (substream
->ops
->silence
) {
104 err
= substream
->ops
->silence(substream
, -1, ofs
, transfer
);
107 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, ofs
);
108 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
* runtime
->channels
);
112 unsigned int channels
= runtime
->channels
;
113 if (substream
->ops
->silence
) {
114 for (c
= 0; c
< channels
; ++c
) {
116 err
= substream
->ops
->silence(substream
, c
, ofs
, transfer
);
120 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
121 for (c
= 0; c
< channels
; ++c
) {
122 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, ofs
);
123 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
);
127 runtime
->silence_filled
+= transfer
;
133 #ifdef CONFIG_SND_DEBUG
134 void snd_pcm_debug_name(struct snd_pcm_substream
*substream
,
135 char *name
, size_t len
)
137 snprintf(name
, len
, "pcmC%dD%d%c:%d",
138 substream
->pcm
->card
->number
,
139 substream
->pcm
->device
,
140 substream
->stream
? 'c' : 'p',
143 EXPORT_SYMBOL(snd_pcm_debug_name
);
146 #define XRUN_DEBUG_BASIC (1<<0)
147 #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
148 #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
149 #define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
150 #define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
151 #define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
152 #define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
154 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
156 #define xrun_debug(substream, mask) \
157 ((substream)->pstr->xrun_debug & (mask))
159 #define xrun_debug(substream, mask) 0
162 #define dump_stack_on_xrun(substream) do { \
163 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
167 static void xrun(struct snd_pcm_substream
*substream
)
169 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
171 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
172 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
173 snd_pcm_stop(substream
, SNDRV_PCM_STATE_XRUN
);
174 if (xrun_debug(substream
, XRUN_DEBUG_BASIC
)) {
176 snd_pcm_debug_name(substream
, name
, sizeof(name
));
177 snd_printd(KERN_DEBUG
"XRUN: %s\n", name
);
178 dump_stack_on_xrun(substream
);
182 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
183 #define hw_ptr_error(substream, fmt, args...) \
185 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
186 xrun_log_show(substream); \
187 if (printk_ratelimit()) { \
188 snd_printd("PCM: " fmt, ##args); \
190 dump_stack_on_xrun(substream); \
194 #define XRUN_LOG_CNT 10
196 struct hwptr_log_entry
{
197 unsigned int in_interrupt
;
198 unsigned long jiffies
;
199 snd_pcm_uframes_t pos
;
200 snd_pcm_uframes_t period_size
;
201 snd_pcm_uframes_t buffer_size
;
202 snd_pcm_uframes_t old_hw_ptr
;
203 snd_pcm_uframes_t hw_ptr_base
;
206 struct snd_pcm_hwptr_log
{
209 struct hwptr_log_entry entries
[XRUN_LOG_CNT
];
212 static void xrun_log(struct snd_pcm_substream
*substream
,
213 snd_pcm_uframes_t pos
, int in_interrupt
)
215 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
216 struct snd_pcm_hwptr_log
*log
= runtime
->hwptr_log
;
217 struct hwptr_log_entry
*entry
;
220 log
= kzalloc(sizeof(*log
), GFP_ATOMIC
);
223 runtime
->hwptr_log
= log
;
225 if (xrun_debug(substream
, XRUN_DEBUG_LOGONCE
) && log
->hit
)
228 entry
= &log
->entries
[log
->idx
];
229 entry
->in_interrupt
= in_interrupt
;
230 entry
->jiffies
= jiffies
;
232 entry
->period_size
= runtime
->period_size
;
233 entry
->buffer_size
= runtime
->buffer_size
;
234 entry
->old_hw_ptr
= runtime
->status
->hw_ptr
;
235 entry
->hw_ptr_base
= runtime
->hw_ptr_base
;
236 log
->idx
= (log
->idx
+ 1) % XRUN_LOG_CNT
;
239 static void xrun_log_show(struct snd_pcm_substream
*substream
)
241 struct snd_pcm_hwptr_log
*log
= substream
->runtime
->hwptr_log
;
242 struct hwptr_log_entry
*entry
;
249 if (xrun_debug(substream
, XRUN_DEBUG_LOGONCE
) && log
->hit
)
251 snd_pcm_debug_name(substream
, name
, sizeof(name
));
252 for (cnt
= 0, idx
= log
->idx
; cnt
< XRUN_LOG_CNT
; cnt
++) {
253 entry
= &log
->entries
[idx
];
254 if (entry
->period_size
== 0)
256 snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
258 name
, entry
->in_interrupt
? "[Q] " : "",
260 (unsigned long)entry
->pos
,
261 (unsigned long)entry
->period_size
,
262 (unsigned long)entry
->buffer_size
,
263 (unsigned long)entry
->old_hw_ptr
,
264 (unsigned long)entry
->hw_ptr_base
);
271 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
273 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
274 #define xrun_log(substream, pos, in_interrupt) do { } while (0)
275 #define xrun_log_show(substream) do { } while (0)
279 int snd_pcm_update_state(struct snd_pcm_substream
*substream
,
280 struct snd_pcm_runtime
*runtime
)
282 snd_pcm_uframes_t avail
;
284 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
285 avail
= snd_pcm_playback_avail(runtime
);
287 avail
= snd_pcm_capture_avail(runtime
);
288 if (avail
> runtime
->avail_max
)
289 runtime
->avail_max
= avail
;
290 if (runtime
->status
->state
== SNDRV_PCM_STATE_DRAINING
) {
291 if (avail
>= runtime
->buffer_size
) {
292 snd_pcm_drain_done(substream
);
296 if (avail
>= runtime
->stop_threshold
) {
301 if (runtime
->twake
) {
302 if (avail
>= runtime
->twake
)
303 wake_up(&runtime
->tsleep
);
304 } else if (avail
>= runtime
->control
->avail_min
)
305 wake_up(&runtime
->sleep
);
309 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream
*substream
,
310 unsigned int in_interrupt
)
312 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
313 snd_pcm_uframes_t pos
;
314 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
, hw_base
;
315 snd_pcm_sframes_t hdelta
, delta
;
316 unsigned long jdelta
;
317 unsigned long curr_jiffies
;
318 struct timespec curr_tstamp
;
319 struct timespec audio_tstamp
;
320 int crossed_boundary
= 0;
322 old_hw_ptr
= runtime
->status
->hw_ptr
;
325 * group pointer, time and jiffies reads to allow for more
326 * accurate correlations/corrections.
327 * The values are stored at the end of this routine after
328 * corrections for hw_ptr position
330 pos
= substream
->ops
->pointer(substream
);
331 curr_jiffies
= jiffies
;
332 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
) {
333 snd_pcm_gettime(runtime
, (struct timespec
*)&curr_tstamp
);
335 if ((runtime
->hw
.info
& SNDRV_PCM_INFO_HAS_WALL_CLOCK
) &&
336 (substream
->ops
->wall_clock
))
337 substream
->ops
->wall_clock(substream
, &audio_tstamp
);
340 if (pos
== SNDRV_PCM_POS_XRUN
) {
344 if (pos
>= runtime
->buffer_size
) {
345 if (printk_ratelimit()) {
347 snd_pcm_debug_name(substream
, name
, sizeof(name
));
348 xrun_log_show(substream
);
349 snd_printd(KERN_ERR
"BUG: %s, pos = %ld, "
350 "buffer size = %ld, period size = %ld\n",
351 name
, pos
, runtime
->buffer_size
,
352 runtime
->period_size
);
356 pos
-= pos
% runtime
->min_align
;
357 if (xrun_debug(substream
, XRUN_DEBUG_LOG
))
358 xrun_log(substream
, pos
, in_interrupt
);
359 hw_base
= runtime
->hw_ptr_base
;
360 new_hw_ptr
= hw_base
+ pos
;
362 /* we know that one period was processed */
363 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
364 delta
= runtime
->hw_ptr_interrupt
+ runtime
->period_size
;
365 if (delta
> new_hw_ptr
) {
366 /* check for double acknowledged interrupts */
367 hdelta
= curr_jiffies
- runtime
->hw_ptr_jiffies
;
369 //if (hdelta > runtime->hw_ptr_buffer_jiffies/2) { //Alsa origin
370 if (hdelta
> runtime
->hw_ptr_buffer_jiffies
*3/4) { //MTK modified
372 hw_base
+= runtime
->buffer_size
;
373 if (hw_base
>= runtime
->boundary
) {
377 new_hw_ptr
= hw_base
+ pos
;
378 printk("%s, overflow? new_hw_ptr=%ld, hw_base=%ld\n",__FUNCTION__
,new_hw_ptr
,hw_base
);
383 /* new_hw_ptr might be lower than old_hw_ptr in case when */
384 /* pointer crosses the end of the ring buffer */
385 if (new_hw_ptr
< old_hw_ptr
) {
386 hw_base
+= runtime
->buffer_size
;
387 if (hw_base
>= runtime
->boundary
) {
391 new_hw_ptr
= hw_base
+ pos
;
394 delta
= new_hw_ptr
- old_hw_ptr
;
396 delta
+= runtime
->boundary
;
397 if (xrun_debug(substream
, in_interrupt
?
398 XRUN_DEBUG_PERIODUPDATE
: XRUN_DEBUG_HWPTRUPDATE
)) {
400 snd_pcm_debug_name(substream
, name
, sizeof(name
));
401 snd_printd("%s_update: %s: pos=%u/%u/%u, "
402 "hwptr=%ld/%ld/%ld/%ld\n",
403 in_interrupt
? "period" : "hwptr",
406 (unsigned int)runtime
->period_size
,
407 (unsigned int)runtime
->buffer_size
,
408 (unsigned long)delta
,
409 (unsigned long)old_hw_ptr
,
410 (unsigned long)new_hw_ptr
,
411 (unsigned long)runtime
->hw_ptr_base
);
414 if (runtime
->no_period_wakeup
) {
415 snd_pcm_sframes_t xrun_threshold
;
417 * Without regular period interrupts, we have to check
418 * the elapsed time to detect xruns.
420 jdelta
= curr_jiffies
- runtime
->hw_ptr_jiffies
;
421 if (jdelta
< runtime
->hw_ptr_buffer_jiffies
/ 2)
423 hdelta
= jdelta
- delta
* HZ
/ runtime
->rate
;
424 xrun_threshold
= runtime
->hw_ptr_buffer_jiffies
/ 2 + 1;
425 while (hdelta
> xrun_threshold
) {
426 delta
+= runtime
->buffer_size
;
427 hw_base
+= runtime
->buffer_size
;
428 if (hw_base
>= runtime
->boundary
) {
432 new_hw_ptr
= hw_base
+ pos
;
433 hdelta
-= runtime
->hw_ptr_buffer_jiffies
;
438 /* something must be really wrong */
439 if (delta
>= runtime
->buffer_size
+ runtime
->period_size
) {
440 hw_ptr_error(substream
,
441 "Unexpected hw_pointer value %s"
442 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
444 in_interrupt
? "[Q] " : "[P]",
445 substream
->stream
, (long)pos
,
446 (long)new_hw_ptr
, (long)old_hw_ptr
);
450 /* Do jiffies check only in xrun_debug mode */
451 if (!xrun_debug(substream
, XRUN_DEBUG_JIFFIESCHECK
))
452 goto no_jiffies_check
;
454 /* Skip the jiffies check for hardwares with BATCH flag.
455 * Such hardware usually just increases the position at each IRQ,
456 * thus it can't give any strange position.
458 if (runtime
->hw
.info
& SNDRV_PCM_INFO_BATCH
)
459 goto no_jiffies_check
;
461 if (hdelta
< runtime
->delay
)
462 goto no_jiffies_check
;
463 hdelta
-= runtime
->delay
;
464 jdelta
= curr_jiffies
- runtime
->hw_ptr_jiffies
;
465 if (((hdelta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
467 (((runtime
->period_size
* HZ
) / runtime
->rate
)
469 /* move new_hw_ptr according jiffies not pos variable */
470 new_hw_ptr
= old_hw_ptr
;
472 /* use loop to avoid checks for delta overflows */
473 /* the delta value is small or zero in most cases */
475 new_hw_ptr
+= runtime
->period_size
;
476 if (new_hw_ptr
>= runtime
->boundary
) {
477 new_hw_ptr
-= runtime
->boundary
;
482 /* align hw_base to buffer_size */
483 hw_ptr_error(substream
,
484 "hw_ptr skipping! %s"
485 "(pos=%ld, delta=%ld, period=%ld, "
486 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
487 in_interrupt
? "[Q] " : "",
488 (long)pos
, (long)hdelta
,
489 (long)runtime
->period_size
, jdelta
,
490 ((hdelta
* HZ
) / runtime
->rate
), hw_base
,
491 (unsigned long)old_hw_ptr
,
492 (unsigned long)new_hw_ptr
);
493 /* reset values to proper state */
495 hw_base
= new_hw_ptr
- (new_hw_ptr
% runtime
->buffer_size
);
498 if (delta
> runtime
->period_size
+ runtime
->period_size
/ 2) {
499 hw_ptr_error(substream
,
500 "Lost interrupts? %s"
501 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
503 in_interrupt
? "[Q] " : "",
504 substream
->stream
, (long)delta
,
510 if (runtime
->status
->hw_ptr
== new_hw_ptr
)
513 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
514 runtime
->silence_size
> 0)
515 snd_pcm_playback_silence(substream
, new_hw_ptr
);
518 delta
= new_hw_ptr
- runtime
->hw_ptr_interrupt
;
520 delta
+= runtime
->boundary
;
521 delta
-= (snd_pcm_uframes_t
)delta
% runtime
->period_size
;
522 runtime
->hw_ptr_interrupt
+= delta
;
523 if (runtime
->hw_ptr_interrupt
>= runtime
->boundary
)
524 runtime
->hw_ptr_interrupt
-= runtime
->boundary
;
526 runtime
->hw_ptr_base
= hw_base
;
527 runtime
->status
->hw_ptr
= new_hw_ptr
;
528 runtime
->hw_ptr_jiffies
= curr_jiffies
;
529 if (crossed_boundary
) {
530 snd_BUG_ON(crossed_boundary
!= 1);
531 runtime
->hw_ptr_wrap
+= runtime
->boundary
;
533 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
) {
534 runtime
->status
->tstamp
= curr_tstamp
;
536 if (!(runtime
->hw
.info
& SNDRV_PCM_INFO_HAS_WALL_CLOCK
)) {
538 * no wall clock available, provide audio timestamp
539 * derived from pointer position+delay
541 u64 audio_frames
, audio_nsecs
;
543 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
544 audio_frames
= runtime
->hw_ptr_wrap
545 + runtime
->status
->hw_ptr
548 audio_frames
= runtime
->hw_ptr_wrap
549 + runtime
->status
->hw_ptr
551 audio_nsecs
= div_u64(audio_frames
* 1000000000LL,
553 audio_tstamp
= ns_to_timespec(audio_nsecs
);
555 runtime
->status
->audio_tstamp
= audio_tstamp
;
558 return snd_pcm_update_state(substream
, runtime
);
561 /* CAUTION: call it with irq disabled */
562 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
)
564 return snd_pcm_update_hw_ptr0(substream
, 0);
568 * snd_pcm_set_ops - set the PCM operators
569 * @pcm: the pcm instance
570 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
571 * @ops: the operator table
573 * Sets the given PCM operators to the pcm instance.
575 void snd_pcm_set_ops(struct snd_pcm
*pcm
, int direction
, struct snd_pcm_ops
*ops
)
577 struct snd_pcm_str
*stream
= &pcm
->streams
[direction
];
578 struct snd_pcm_substream
*substream
;
580 for (substream
= stream
->substream
; substream
!= NULL
; substream
= substream
->next
)
581 substream
->ops
= ops
;
584 EXPORT_SYMBOL(snd_pcm_set_ops
);
587 * snd_pcm_sync - set the PCM sync id
588 * @substream: the pcm substream
590 * Sets the PCM sync identifier for the card.
592 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
)
594 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
596 runtime
->sync
.id32
[0] = substream
->pcm
->card
->number
;
597 runtime
->sync
.id32
[1] = -1;
598 runtime
->sync
.id32
[2] = -1;
599 runtime
->sync
.id32
[3] = -1;
602 EXPORT_SYMBOL(snd_pcm_set_sync
);
605 * Standard ioctl routine
608 static inline unsigned int div32(unsigned int a
, unsigned int b
,
619 static inline unsigned int div_down(unsigned int a
, unsigned int b
)
626 static inline unsigned int div_up(unsigned int a
, unsigned int b
)
638 static inline unsigned int mul(unsigned int a
, unsigned int b
)
642 if (div_down(UINT_MAX
, a
) < b
)
647 static inline unsigned int muldiv32(unsigned int a
, unsigned int b
,
648 unsigned int c
, unsigned int *r
)
650 u_int64_t n
= (u_int64_t
) a
* b
;
656 n
= div_u64_rem(n
, c
, r
);
665 * snd_interval_refine - refine the interval value of configurator
666 * @i: the interval value to refine
667 * @v: the interval value to refer to
669 * Refines the interval value with the reference value.
670 * The interval is changed to the range satisfying both intervals.
671 * The interval status (min, max, integer, etc.) are evaluated.
673 * Return: Positive if the value is changed, zero if it's not changed, or a
674 * negative error code.
676 int snd_interval_refine(struct snd_interval
*i
, const struct snd_interval
*v
)
679 if (snd_BUG_ON(snd_interval_empty(i
)))
681 if (i
->min
< v
->min
) {
683 i
->openmin
= v
->openmin
;
685 } else if (i
->min
== v
->min
&& !i
->openmin
&& v
->openmin
) {
689 if (i
->max
> v
->max
) {
691 i
->openmax
= v
->openmax
;
693 } else if (i
->max
== v
->max
&& !i
->openmax
&& v
->openmax
) {
697 if (!i
->integer
&& v
->integer
) {
710 } else if (!i
->openmin
&& !i
->openmax
&& i
->min
== i
->max
)
712 if (snd_interval_checkempty(i
)) {
713 snd_interval_none(i
);
719 EXPORT_SYMBOL(snd_interval_refine
);
721 static int snd_interval_refine_first(struct snd_interval
*i
)
723 if (snd_BUG_ON(snd_interval_empty(i
)))
725 if (snd_interval_single(i
))
728 i
->openmax
= i
->openmin
;
734 static int snd_interval_refine_last(struct snd_interval
*i
)
736 if (snd_BUG_ON(snd_interval_empty(i
)))
738 if (snd_interval_single(i
))
741 i
->openmin
= i
->openmax
;
747 void snd_interval_mul(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
749 if (a
->empty
|| b
->empty
) {
750 snd_interval_none(c
);
754 c
->min
= mul(a
->min
, b
->min
);
755 c
->openmin
= (a
->openmin
|| b
->openmin
);
756 c
->max
= mul(a
->max
, b
->max
);
757 c
->openmax
= (a
->openmax
|| b
->openmax
);
758 c
->integer
= (a
->integer
&& b
->integer
);
762 * snd_interval_div - refine the interval value with division
769 * Returns non-zero if the value is changed, zero if not changed.
771 void snd_interval_div(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
774 if (a
->empty
|| b
->empty
) {
775 snd_interval_none(c
);
779 c
->min
= div32(a
->min
, b
->max
, &r
);
780 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
782 c
->max
= div32(a
->max
, b
->min
, &r
);
787 c
->openmax
= (a
->openmax
|| b
->openmin
);
796 * snd_interval_muldivk - refine the interval value
799 * @k: divisor (as integer)
804 * Returns non-zero if the value is changed, zero if not changed.
806 void snd_interval_muldivk(const struct snd_interval
*a
, const struct snd_interval
*b
,
807 unsigned int k
, struct snd_interval
*c
)
810 if (a
->empty
|| b
->empty
) {
811 snd_interval_none(c
);
815 c
->min
= muldiv32(a
->min
, b
->min
, k
, &r
);
816 c
->openmin
= (r
|| a
->openmin
|| b
->openmin
);
817 c
->max
= muldiv32(a
->max
, b
->max
, k
, &r
);
822 c
->openmax
= (a
->openmax
|| b
->openmax
);
827 * snd_interval_mulkdiv - refine the interval value
829 * @k: dividend 2 (as integer)
835 * Returns non-zero if the value is changed, zero if not changed.
837 void snd_interval_mulkdiv(const struct snd_interval
*a
, unsigned int k
,
838 const struct snd_interval
*b
, struct snd_interval
*c
)
841 if (a
->empty
|| b
->empty
) {
842 snd_interval_none(c
);
846 c
->min
= muldiv32(a
->min
, k
, b
->max
, &r
);
847 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
849 c
->max
= muldiv32(a
->max
, k
, b
->min
, &r
);
854 c
->openmax
= (a
->openmax
|| b
->openmin
);
866 * snd_interval_ratnum - refine the interval value
867 * @i: interval to refine
868 * @rats_count: number of ratnum_t
869 * @rats: ratnum_t array
870 * @nump: pointer to store the resultant numerator
871 * @denp: pointer to store the resultant denominator
873 * Return: Positive if the value is changed, zero if it's not changed, or a
874 * negative error code.
876 int snd_interval_ratnum(struct snd_interval
*i
,
877 unsigned int rats_count
, struct snd_ratnum
*rats
,
878 unsigned int *nump
, unsigned int *denp
)
880 unsigned int best_num
, best_den
;
883 struct snd_interval t
;
885 unsigned int result_num
, result_den
;
888 best_num
= best_den
= best_diff
= 0;
889 for (k
= 0; k
< rats_count
; ++k
) {
890 unsigned int num
= rats
[k
].num
;
892 unsigned int q
= i
->min
;
896 den
= div_up(num
, q
);
897 if (den
< rats
[k
].den_min
)
899 if (den
> rats
[k
].den_max
)
900 den
= rats
[k
].den_max
;
903 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
907 diff
= num
- q
* den
;
911 diff
* best_den
< best_diff
* den
) {
921 t
.min
= div_down(best_num
, best_den
);
922 t
.openmin
= !!(best_num
% best_den
);
924 result_num
= best_num
;
925 result_diff
= best_diff
;
926 result_den
= best_den
;
927 best_num
= best_den
= best_diff
= 0;
928 for (k
= 0; k
< rats_count
; ++k
) {
929 unsigned int num
= rats
[k
].num
;
931 unsigned int q
= i
->max
;
937 den
= div_down(num
, q
);
938 if (den
> rats
[k
].den_max
)
940 if (den
< rats
[k
].den_min
)
941 den
= rats
[k
].den_min
;
944 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
946 den
+= rats
[k
].den_step
- r
;
948 diff
= q
* den
- num
;
952 diff
* best_den
< best_diff
* den
) {
962 t
.max
= div_up(best_num
, best_den
);
963 t
.openmax
= !!(best_num
% best_den
);
965 err
= snd_interval_refine(i
, &t
);
969 if (snd_interval_single(i
)) {
970 if (best_diff
* result_den
< result_diff
* best_den
) {
971 result_num
= best_num
;
972 result_den
= best_den
;
982 EXPORT_SYMBOL(snd_interval_ratnum
);
985 * snd_interval_ratden - refine the interval value
986 * @i: interval to refine
987 * @rats_count: number of struct ratden
988 * @rats: struct ratden array
989 * @nump: pointer to store the resultant numerator
990 * @denp: pointer to store the resultant denominator
992 * Return: Positive if the value is changed, zero if it's not changed, or a
993 * negative error code.
995 static int snd_interval_ratden(struct snd_interval
*i
,
996 unsigned int rats_count
, struct snd_ratden
*rats
,
997 unsigned int *nump
, unsigned int *denp
)
999 unsigned int best_num
, best_diff
, best_den
;
1001 struct snd_interval t
;
1004 best_num
= best_den
= best_diff
= 0;
1005 for (k
= 0; k
< rats_count
; ++k
) {
1007 unsigned int den
= rats
[k
].den
;
1008 unsigned int q
= i
->min
;
1011 if (num
> rats
[k
].num_max
)
1013 if (num
< rats
[k
].num_min
)
1014 num
= rats
[k
].num_max
;
1017 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
1019 num
+= rats
[k
].num_step
- r
;
1021 diff
= num
- q
* den
;
1022 if (best_num
== 0 ||
1023 diff
* best_den
< best_diff
* den
) {
1029 if (best_den
== 0) {
1033 t
.min
= div_down(best_num
, best_den
);
1034 t
.openmin
= !!(best_num
% best_den
);
1036 best_num
= best_den
= best_diff
= 0;
1037 for (k
= 0; k
< rats_count
; ++k
) {
1039 unsigned int den
= rats
[k
].den
;
1040 unsigned int q
= i
->max
;
1043 if (num
< rats
[k
].num_min
)
1045 if (num
> rats
[k
].num_max
)
1046 num
= rats
[k
].num_max
;
1049 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
1053 diff
= q
* den
- num
;
1054 if (best_num
== 0 ||
1055 diff
* best_den
< best_diff
* den
) {
1061 if (best_den
== 0) {
1065 t
.max
= div_up(best_num
, best_den
);
1066 t
.openmax
= !!(best_num
% best_den
);
1068 err
= snd_interval_refine(i
, &t
);
1072 if (snd_interval_single(i
)) {
1082 * snd_interval_list - refine the interval value from the list
1083 * @i: the interval value to refine
1084 * @count: the number of elements in the list
1085 * @list: the value list
1086 * @mask: the bit-mask to evaluate
1088 * Refines the interval value from the list.
1089 * When mask is non-zero, only the elements corresponding to bit 1 are
1092 * Return: Positive if the value is changed, zero if it's not changed, or a
1093 * negative error code.
1095 int snd_interval_list(struct snd_interval
*i
, unsigned int count
,
1096 const unsigned int *list
, unsigned int mask
)
1099 struct snd_interval list_range
;
1105 snd_interval_any(&list_range
);
1106 list_range
.min
= UINT_MAX
;
1108 for (k
= 0; k
< count
; k
++) {
1109 if (mask
&& !(mask
& (1 << k
)))
1111 if (!snd_interval_test(i
, list
[k
]))
1113 list_range
.min
= min(list_range
.min
, list
[k
]);
1114 list_range
.max
= max(list_range
.max
, list
[k
]);
1116 return snd_interval_refine(i
, &list_range
);
1119 EXPORT_SYMBOL(snd_interval_list
);
1121 static int snd_interval_step(struct snd_interval
*i
, unsigned int min
, unsigned int step
)
1125 n
= (i
->min
- min
) % step
;
1126 if (n
!= 0 || i
->openmin
) {
1130 n
= (i
->max
- min
) % step
;
1131 if (n
!= 0 || i
->openmax
) {
1135 if (snd_interval_checkempty(i
)) {
1142 /* Info constraints helpers */
1145 * snd_pcm_hw_rule_add - add the hw-constraint rule
1146 * @runtime: the pcm runtime instance
1147 * @cond: condition bits
1148 * @var: the variable to evaluate
1149 * @func: the evaluation function
1150 * @private: the private data pointer passed to function
1151 * @dep: the dependent variables
1153 * Return: Zero if successful, or a negative error code on failure.
1155 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
, unsigned int cond
,
1157 snd_pcm_hw_rule_func_t func
, void *private,
1160 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1161 struct snd_pcm_hw_rule
*c
;
1164 va_start(args
, dep
);
1165 if (constrs
->rules_num
>= constrs
->rules_all
) {
1166 struct snd_pcm_hw_rule
*new;
1167 unsigned int new_rules
= constrs
->rules_all
+ 16;
1168 new = kcalloc(new_rules
, sizeof(*c
), GFP_KERNEL
);
1173 if (constrs
->rules
) {
1174 memcpy(new, constrs
->rules
,
1175 constrs
->rules_num
* sizeof(*c
));
1176 kfree(constrs
->rules
);
1178 constrs
->rules
= new;
1179 constrs
->rules_all
= new_rules
;
1181 c
= &constrs
->rules
[constrs
->rules_num
];
1185 c
->private = private;
1188 if (snd_BUG_ON(k
>= ARRAY_SIZE(c
->deps
))) {
1195 dep
= va_arg(args
, int);
1197 constrs
->rules_num
++;
1202 EXPORT_SYMBOL(snd_pcm_hw_rule_add
);
1205 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1206 * @runtime: PCM runtime instance
1207 * @var: hw_params variable to apply the mask
1208 * @mask: the bitmap mask
1210 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1212 * Return: Zero if successful, or a negative error code on failure.
1214 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1217 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1218 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1219 *maskp
->bits
&= mask
;
1220 memset(maskp
->bits
+ 1, 0, (SNDRV_MASK_MAX
-32) / 8); /* clear rest */
1221 if (*maskp
->bits
== 0)
1227 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1228 * @runtime: PCM runtime instance
1229 * @var: hw_params variable to apply the mask
1230 * @mask: the 64bit bitmap mask
1232 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1234 * Return: Zero if successful, or a negative error code on failure.
1236 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1239 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1240 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1241 maskp
->bits
[0] &= (u_int32_t
)mask
;
1242 maskp
->bits
[1] &= (u_int32_t
)(mask
>> 32);
1243 memset(maskp
->bits
+ 2, 0, (SNDRV_MASK_MAX
-64) / 8); /* clear rest */
1244 if (! maskp
->bits
[0] && ! maskp
->bits
[1])
1250 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1251 * @runtime: PCM runtime instance
1252 * @var: hw_params variable to apply the integer constraint
1254 * Apply the constraint of integer to an interval parameter.
1256 * Return: Positive if the value is changed, zero if it's not changed, or a
1257 * negative error code.
1259 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
)
1261 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1262 return snd_interval_setinteger(constrs_interval(constrs
, var
));
1265 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer
);
1268 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1269 * @runtime: PCM runtime instance
1270 * @var: hw_params variable to apply the range
1271 * @min: the minimal value
1272 * @max: the maximal value
1274 * Apply the min/max range constraint to an interval parameter.
1276 * Return: Positive if the value is changed, zero if it's not changed, or a
1277 * negative error code.
1279 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1280 unsigned int min
, unsigned int max
)
1282 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1283 struct snd_interval t
;
1286 t
.openmin
= t
.openmax
= 0;
1288 return snd_interval_refine(constrs_interval(constrs
, var
), &t
);
1291 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax
);
1293 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params
*params
,
1294 struct snd_pcm_hw_rule
*rule
)
1296 struct snd_pcm_hw_constraint_list
*list
= rule
->private;
1297 return snd_interval_list(hw_param_interval(params
, rule
->var
), list
->count
, list
->list
, list
->mask
);
1302 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1303 * @runtime: PCM runtime instance
1304 * @cond: condition bits
1305 * @var: hw_params variable to apply the list constraint
1308 * Apply the list of constraints to an interval parameter.
1310 * Return: Zero if successful, or a negative error code on failure.
1312 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
1314 snd_pcm_hw_param_t var
,
1315 const struct snd_pcm_hw_constraint_list
*l
)
1317 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1318 snd_pcm_hw_rule_list
, (void *)l
,
1322 EXPORT_SYMBOL(snd_pcm_hw_constraint_list
);
1324 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params
*params
,
1325 struct snd_pcm_hw_rule
*rule
)
1327 struct snd_pcm_hw_constraint_ratnums
*r
= rule
->private;
1328 unsigned int num
= 0, den
= 0;
1330 err
= snd_interval_ratnum(hw_param_interval(params
, rule
->var
),
1331 r
->nrats
, r
->rats
, &num
, &den
);
1332 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1333 params
->rate_num
= num
;
1334 params
->rate_den
= den
;
1340 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1341 * @runtime: PCM runtime instance
1342 * @cond: condition bits
1343 * @var: hw_params variable to apply the ratnums constraint
1344 * @r: struct snd_ratnums constriants
1346 * Return: Zero if successful, or a negative error code on failure.
1348 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
1350 snd_pcm_hw_param_t var
,
1351 struct snd_pcm_hw_constraint_ratnums
*r
)
1353 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1354 snd_pcm_hw_rule_ratnums
, r
,
1358 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums
);
1360 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params
*params
,
1361 struct snd_pcm_hw_rule
*rule
)
1363 struct snd_pcm_hw_constraint_ratdens
*r
= rule
->private;
1364 unsigned int num
= 0, den
= 0;
1365 int err
= snd_interval_ratden(hw_param_interval(params
, rule
->var
),
1366 r
->nrats
, r
->rats
, &num
, &den
);
1367 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1368 params
->rate_num
= num
;
1369 params
->rate_den
= den
;
1375 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1376 * @runtime: PCM runtime instance
1377 * @cond: condition bits
1378 * @var: hw_params variable to apply the ratdens constraint
1379 * @r: struct snd_ratdens constriants
1381 * Return: Zero if successful, or a negative error code on failure.
1383 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
1385 snd_pcm_hw_param_t var
,
1386 struct snd_pcm_hw_constraint_ratdens
*r
)
1388 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1389 snd_pcm_hw_rule_ratdens
, r
,
1393 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens
);
1395 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params
*params
,
1396 struct snd_pcm_hw_rule
*rule
)
1398 unsigned int l
= (unsigned long) rule
->private;
1399 int width
= l
& 0xffff;
1400 unsigned int msbits
= l
>> 16;
1401 struct snd_interval
*i
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_SAMPLE_BITS
);
1402 if (snd_interval_single(i
) && snd_interval_value(i
) == width
)
1403 params
->msbits
= msbits
;
1408 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1409 * @runtime: PCM runtime instance
1410 * @cond: condition bits
1411 * @width: sample bits width
1412 * @msbits: msbits width
1414 * Return: Zero if successful, or a negative error code on failure.
1416 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
1419 unsigned int msbits
)
1421 unsigned long l
= (msbits
<< 16) | width
;
1422 return snd_pcm_hw_rule_add(runtime
, cond
, -1,
1423 snd_pcm_hw_rule_msbits
,
1425 SNDRV_PCM_HW_PARAM_SAMPLE_BITS
, -1);
1428 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits
);
1430 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params
*params
,
1431 struct snd_pcm_hw_rule
*rule
)
1433 unsigned long step
= (unsigned long) rule
->private;
1434 return snd_interval_step(hw_param_interval(params
, rule
->var
), 0, step
);
1438 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1439 * @runtime: PCM runtime instance
1440 * @cond: condition bits
1441 * @var: hw_params variable to apply the step constraint
1444 * Return: Zero if successful, or a negative error code on failure.
1446 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
1448 snd_pcm_hw_param_t var
,
1451 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1452 snd_pcm_hw_rule_step
, (void *) step
,
1456 EXPORT_SYMBOL(snd_pcm_hw_constraint_step
);
1458 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params
*params
, struct snd_pcm_hw_rule
*rule
)
1460 static unsigned int pow2_sizes
[] = {
1461 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1462 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1463 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1464 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1466 return snd_interval_list(hw_param_interval(params
, rule
->var
),
1467 ARRAY_SIZE(pow2_sizes
), pow2_sizes
, 0);
1471 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1472 * @runtime: PCM runtime instance
1473 * @cond: condition bits
1474 * @var: hw_params variable to apply the power-of-2 constraint
1476 * Return: Zero if successful, or a negative error code on failure.
1478 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
1480 snd_pcm_hw_param_t var
)
1482 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1483 snd_pcm_hw_rule_pow2
, NULL
,
1487 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2
);
1489 static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params
*params
,
1490 struct snd_pcm_hw_rule
*rule
)
1492 unsigned int base_rate
= (unsigned int)(uintptr_t)rule
->private;
1493 struct snd_interval
*rate
;
1495 rate
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
1496 return snd_interval_list(rate
, 1, &base_rate
, 0);
1500 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1501 * @runtime: PCM runtime instance
1502 * @base_rate: the rate at which the hardware does not resample
1504 * Return: Zero if successful, or a negative error code on failure.
1506 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime
*runtime
,
1507 unsigned int base_rate
)
1509 return snd_pcm_hw_rule_add(runtime
, SNDRV_PCM_HW_PARAMS_NORESAMPLE
,
1510 SNDRV_PCM_HW_PARAM_RATE
,
1511 snd_pcm_hw_rule_noresample_func
,
1512 (void *)(uintptr_t)base_rate
,
1513 SNDRV_PCM_HW_PARAM_RATE
, -1);
1515 EXPORT_SYMBOL(snd_pcm_hw_rule_noresample
);
1517 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params
*params
,
1518 snd_pcm_hw_param_t var
)
1520 if (hw_is_mask(var
)) {
1521 snd_mask_any(hw_param_mask(params
, var
));
1522 params
->cmask
|= 1 << var
;
1523 params
->rmask
|= 1 << var
;
1526 if (hw_is_interval(var
)) {
1527 snd_interval_any(hw_param_interval(params
, var
));
1528 params
->cmask
|= 1 << var
;
1529 params
->rmask
|= 1 << var
;
1535 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
)
1538 memset(params
, 0, sizeof(*params
));
1539 for (k
= SNDRV_PCM_HW_PARAM_FIRST_MASK
; k
<= SNDRV_PCM_HW_PARAM_LAST_MASK
; k
++)
1540 _snd_pcm_hw_param_any(params
, k
);
1541 for (k
= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
; k
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
; k
++)
1542 _snd_pcm_hw_param_any(params
, k
);
1546 EXPORT_SYMBOL(_snd_pcm_hw_params_any
);
1549 * snd_pcm_hw_param_value - return @params field @var value
1550 * @params: the hw_params instance
1551 * @var: parameter to retrieve
1552 * @dir: pointer to the direction (-1,0,1) or %NULL
1554 * Return: The value for field @var if it's fixed in configuration space
1555 * defined by @params. -%EINVAL otherwise.
1557 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
1558 snd_pcm_hw_param_t var
, int *dir
)
1560 if (hw_is_mask(var
)) {
1561 const struct snd_mask
*mask
= hw_param_mask_c(params
, var
);
1562 if (!snd_mask_single(mask
))
1566 return snd_mask_value(mask
);
1568 if (hw_is_interval(var
)) {
1569 const struct snd_interval
*i
= hw_param_interval_c(params
, var
);
1570 if (!snd_interval_single(i
))
1574 return snd_interval_value(i
);
1579 EXPORT_SYMBOL(snd_pcm_hw_param_value
);
1581 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
,
1582 snd_pcm_hw_param_t var
)
1584 if (hw_is_mask(var
)) {
1585 snd_mask_none(hw_param_mask(params
, var
));
1586 params
->cmask
|= 1 << var
;
1587 params
->rmask
|= 1 << var
;
1588 } else if (hw_is_interval(var
)) {
1589 snd_interval_none(hw_param_interval(params
, var
));
1590 params
->cmask
|= 1 << var
;
1591 params
->rmask
|= 1 << var
;
1597 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty
);
1599 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params
*params
,
1600 snd_pcm_hw_param_t var
)
1603 if (hw_is_mask(var
))
1604 changed
= snd_mask_refine_first(hw_param_mask(params
, var
));
1605 else if (hw_is_interval(var
))
1606 changed
= snd_interval_refine_first(hw_param_interval(params
, var
));
1610 params
->cmask
|= 1 << var
;
1611 params
->rmask
|= 1 << var
;
1618 * snd_pcm_hw_param_first - refine config space and return minimum value
1619 * @pcm: PCM instance
1620 * @params: the hw_params instance
1621 * @var: parameter to retrieve
1622 * @dir: pointer to the direction (-1,0,1) or %NULL
1624 * Inside configuration space defined by @params remove from @var all
1625 * values > minimum. Reduce configuration space accordingly.
1627 * Return: The minimum, or a negative error code on failure.
1629 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
1630 struct snd_pcm_hw_params
*params
,
1631 snd_pcm_hw_param_t var
, int *dir
)
1633 int changed
= _snd_pcm_hw_param_first(params
, var
);
1636 if (params
->rmask
) {
1637 int err
= snd_pcm_hw_refine(pcm
, params
);
1638 if (snd_BUG_ON(err
< 0))
1641 return snd_pcm_hw_param_value(params
, var
, dir
);
1644 EXPORT_SYMBOL(snd_pcm_hw_param_first
);
1646 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params
*params
,
1647 snd_pcm_hw_param_t var
)
1650 if (hw_is_mask(var
))
1651 changed
= snd_mask_refine_last(hw_param_mask(params
, var
));
1652 else if (hw_is_interval(var
))
1653 changed
= snd_interval_refine_last(hw_param_interval(params
, var
));
1657 params
->cmask
|= 1 << var
;
1658 params
->rmask
|= 1 << var
;
1665 * snd_pcm_hw_param_last - refine config space and return maximum value
1666 * @pcm: PCM instance
1667 * @params: the hw_params instance
1668 * @var: parameter to retrieve
1669 * @dir: pointer to the direction (-1,0,1) or %NULL
1671 * Inside configuration space defined by @params remove from @var all
1672 * values < maximum. Reduce configuration space accordingly.
1674 * Return: The maximum, or a negative error code on failure.
1676 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
1677 struct snd_pcm_hw_params
*params
,
1678 snd_pcm_hw_param_t var
, int *dir
)
1680 int changed
= _snd_pcm_hw_param_last(params
, var
);
1683 if (params
->rmask
) {
1684 int err
= snd_pcm_hw_refine(pcm
, params
);
1685 if (snd_BUG_ON(err
< 0))
1688 return snd_pcm_hw_param_value(params
, var
, dir
);
1691 EXPORT_SYMBOL(snd_pcm_hw_param_last
);
1694 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1695 * @pcm: PCM instance
1696 * @params: the hw_params instance
1698 * Choose one configuration from configuration space defined by @params.
1699 * The configuration chosen is that obtained fixing in this order:
1700 * first access, first format, first subformat, min channels,
1701 * min rate, min period time, max buffer size, min tick time
1703 * Return: Zero if successful, or a negative error code on failure.
1705 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*pcm
,
1706 struct snd_pcm_hw_params
*params
)
1708 static int vars
[] = {
1709 SNDRV_PCM_HW_PARAM_ACCESS
,
1710 SNDRV_PCM_HW_PARAM_FORMAT
,
1711 SNDRV_PCM_HW_PARAM_SUBFORMAT
,
1712 SNDRV_PCM_HW_PARAM_CHANNELS
,
1713 SNDRV_PCM_HW_PARAM_RATE
,
1714 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1715 SNDRV_PCM_HW_PARAM_BUFFER_SIZE
,
1716 SNDRV_PCM_HW_PARAM_TICK_TIME
,
1721 for (v
= vars
; *v
!= -1; v
++) {
1722 if (*v
!= SNDRV_PCM_HW_PARAM_BUFFER_SIZE
)
1723 err
= snd_pcm_hw_param_first(pcm
, params
, *v
, NULL
);
1725 err
= snd_pcm_hw_param_last(pcm
, params
, *v
, NULL
);
1726 if (snd_BUG_ON(err
< 0))
1732 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream
*substream
,
1735 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1736 unsigned long flags
;
1737 snd_pcm_stream_lock_irqsave(substream
, flags
);
1738 if (snd_pcm_running(substream
) &&
1739 snd_pcm_update_hw_ptr(substream
) >= 0)
1740 runtime
->status
->hw_ptr
%= runtime
->buffer_size
;
1742 runtime
->status
->hw_ptr
= 0;
1743 runtime
->hw_ptr_wrap
= 0;
1745 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1749 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream
*substream
,
1752 struct snd_pcm_channel_info
*info
= arg
;
1753 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1755 if (!(runtime
->info
& SNDRV_PCM_INFO_MMAP
)) {
1759 width
= snd_pcm_format_physical_width(runtime
->format
);
1763 switch (runtime
->access
) {
1764 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
:
1765 case SNDRV_PCM_ACCESS_RW_INTERLEAVED
:
1766 info
->first
= info
->channel
* width
;
1767 info
->step
= runtime
->channels
* width
;
1769 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED
:
1770 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
:
1772 size_t size
= runtime
->dma_bytes
/ runtime
->channels
;
1773 info
->first
= info
->channel
* size
* 8;
1784 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream
*substream
,
1787 struct snd_pcm_hw_params
*params
= arg
;
1788 snd_pcm_format_t format
;
1792 params
->fifo_size
= substream
->runtime
->hw
.fifo_size
;
1793 if (!(substream
->runtime
->hw
.info
& SNDRV_PCM_INFO_FIFO_IN_FRAMES
)) {
1794 format
= params_format(params
);
1795 channels
= params_channels(params
);
1796 frame_size
= snd_pcm_format_size(format
, channels
);
1798 params
->fifo_size
/= (unsigned)frame_size
;
1804 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1805 * @substream: the pcm substream instance
1806 * @cmd: ioctl command
1807 * @arg: ioctl argument
1809 * Processes the generic ioctl commands for PCM.
1810 * Can be passed as the ioctl callback for PCM ops.
1812 * Return: Zero if successful, or a negative error code on failure.
1814 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
1815 unsigned int cmd
, void *arg
)
1818 case SNDRV_PCM_IOCTL1_INFO
:
1820 case SNDRV_PCM_IOCTL1_RESET
:
1821 return snd_pcm_lib_ioctl_reset(substream
, arg
);
1822 case SNDRV_PCM_IOCTL1_CHANNEL_INFO
:
1823 return snd_pcm_lib_ioctl_channel_info(substream
, arg
);
1824 case SNDRV_PCM_IOCTL1_FIFO_SIZE
:
1825 return snd_pcm_lib_ioctl_fifo_size(substream
, arg
);
1830 EXPORT_SYMBOL(snd_pcm_lib_ioctl
);
1833 * snd_pcm_period_elapsed - update the pcm status for the next period
1834 * @substream: the pcm substream instance
1836 * This function is called from the interrupt handler when the
1837 * PCM has processed the period size. It will update the current
1838 * pointer, wake up sleepers, etc.
1840 * Even if more than one periods have elapsed since the last call, you
1841 * have to call this only once.
1843 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
)
1845 struct snd_pcm_runtime
*runtime
;
1846 unsigned long flags
;
1848 if (PCM_RUNTIME_CHECK(substream
))
1850 runtime
= substream
->runtime
;
1852 if (runtime
->transfer_ack_begin
)
1853 runtime
->transfer_ack_begin(substream
);
1855 snd_pcm_stream_lock_irqsave(substream
, flags
);
1856 if (!snd_pcm_running(substream
) ||
1857 snd_pcm_update_hw_ptr0(substream
, 1) < 0)
1860 if (substream
->timer_running
)
1861 snd_timer_interrupt(substream
->timer
, 1);
1863 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1864 if (runtime
->transfer_ack_end
)
1865 runtime
->transfer_ack_end(substream
);
1866 kill_fasync(&runtime
->fasync
, SIGIO
, POLL_IN
);
1869 EXPORT_SYMBOL(snd_pcm_period_elapsed
);
1872 * Wait until avail_min data becomes available
1873 * Returns a negative error code if any error occurs during operation.
1874 * The available space is stored on availp. When err = 0 and avail = 0
1875 * on the capture stream, it indicates the stream is in DRAINING state.
1877 static int wait_for_avail(struct snd_pcm_substream
*substream
,
1878 snd_pcm_uframes_t
*availp
)
1880 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1881 int is_playback
= substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
;
1884 snd_pcm_uframes_t avail
= 0;
1885 long wait_time
, tout
;
1887 init_waitqueue_entry(&wait
, current
);
1888 set_current_state(TASK_INTERRUPTIBLE
);
1889 add_wait_queue(&runtime
->tsleep
, &wait
);
1891 if (runtime
->no_period_wakeup
)
1892 wait_time
= MAX_SCHEDULE_TIMEOUT
;
1894 wait_time
= 3/*10*/;//Modified by MTK
1895 if (runtime
->rate
) {
1896 long t
= runtime
->period_size
* 2 / runtime
->rate
;
1897 wait_time
= max(t
, wait_time
);
1899 wait_time
= msecs_to_jiffies(wait_time
* 1000);
1903 if (signal_pending(current
)) {
1909 * We need to check if space became available already
1910 * (and thus the wakeup happened already) first to close
1911 * the race of space already having become available.
1912 * This check must happen after been added to the waitqueue
1913 * and having current state be INTERRUPTIBLE.
1916 avail
= snd_pcm_playback_avail(runtime
);
1918 avail
= snd_pcm_capture_avail(runtime
);
1919 if (avail
>= runtime
->twake
)
1921 snd_pcm_stream_unlock_irq(substream
);
1923 tout
= schedule_timeout(wait_time
);
1925 snd_pcm_stream_lock_irq(substream
);
1926 set_current_state(TASK_INTERRUPTIBLE
);
1927 switch (runtime
->status
->state
) {
1928 case SNDRV_PCM_STATE_SUSPENDED
:
1931 case SNDRV_PCM_STATE_XRUN
:
1934 case SNDRV_PCM_STATE_DRAINING
:
1938 avail
= 0; /* indicate draining */
1940 case SNDRV_PCM_STATE_OPEN
:
1941 case SNDRV_PCM_STATE_SETUP
:
1942 case SNDRV_PCM_STATE_DISCONNECTED
:
1945 case SNDRV_PCM_STATE_PAUSED
:
1949 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1950 is_playback
? "playback" : "capture");
1956 set_current_state(TASK_RUNNING
);
1957 remove_wait_queue(&runtime
->tsleep
, &wait
);
1962 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream
*substream
,
1964 unsigned long data
, unsigned int off
,
1965 snd_pcm_uframes_t frames
)
1967 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1969 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1970 if (substream
->ops
->copy
) {
1971 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1974 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1975 if (copy_from_user(hwbuf
, buf
, frames_to_bytes(runtime
, frames
)))
1981 typedef int (*transfer_f
)(struct snd_pcm_substream
*substream
, unsigned int hwoff
,
1982 unsigned long data
, unsigned int off
,
1983 snd_pcm_uframes_t size
);
1985 static snd_pcm_sframes_t
snd_pcm_lib_write1(struct snd_pcm_substream
*substream
,
1987 snd_pcm_uframes_t size
,
1989 transfer_f transfer
)
1991 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1992 snd_pcm_uframes_t xfer
= 0;
1993 snd_pcm_uframes_t offset
= 0;
1994 snd_pcm_uframes_t avail
;
2000 snd_pcm_stream_lock_irq(substream
);
2001 switch (runtime
->status
->state
) {
2002 case SNDRV_PCM_STATE_PREPARED
:
2003 case SNDRV_PCM_STATE_RUNNING
:
2004 case SNDRV_PCM_STATE_PAUSED
:
2006 case SNDRV_PCM_STATE_XRUN
:
2009 case SNDRV_PCM_STATE_SUSPENDED
:
2017 runtime
->twake
= runtime
->control
->avail_min
? : 1;
2018 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
2019 snd_pcm_update_hw_ptr(substream
);
2020 avail
= snd_pcm_playback_avail(runtime
);
2022 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
2023 snd_pcm_uframes_t cont
;
2029 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
2030 runtime
->control
->avail_min
? : 1);
2031 err
= wait_for_avail(substream
, &avail
);
2035 frames
= size
> avail
? avail
: size
;
2036 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
2039 if (snd_BUG_ON(!frames
)) {
2041 snd_pcm_stream_unlock_irq(substream
);
2044 appl_ptr
= runtime
->control
->appl_ptr
;
2045 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2046 snd_pcm_stream_unlock_irq(substream
);
2047 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
2048 snd_pcm_stream_lock_irq(substream
);
2051 switch (runtime
->status
->state
) {
2052 case SNDRV_PCM_STATE_XRUN
:
2055 case SNDRV_PCM_STATE_SUSPENDED
:
2062 if (appl_ptr
>= runtime
->boundary
)
2063 appl_ptr
-= runtime
->boundary
;
2064 runtime
->control
->appl_ptr
= appl_ptr
;
2065 if (substream
->ops
->ack
)
2066 substream
->ops
->ack(substream
);
2072 if (runtime
->status
->state
== SNDRV_PCM_STATE_PREPARED
&&
2073 snd_pcm_playback_hw_avail(runtime
) >= (snd_pcm_sframes_t
)runtime
->start_threshold
) {
2074 err
= snd_pcm_start(substream
);
2081 if (xfer
> 0 && err
>= 0)
2082 snd_pcm_update_state(substream
, runtime
);
2083 snd_pcm_stream_unlock_irq(substream
);
2084 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2087 /* sanity-check for read/write methods */
2088 static int pcm_sanity_check(struct snd_pcm_substream
*substream
)
2090 struct snd_pcm_runtime
*runtime
;
2091 if (PCM_RUNTIME_CHECK(substream
))
2093 runtime
= substream
->runtime
;
2094 if (snd_BUG_ON(!substream
->ops
->copy
&& !runtime
->dma_area
))
2096 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2101 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
, const void __user
*buf
, snd_pcm_uframes_t size
)
2103 struct snd_pcm_runtime
*runtime
;
2107 err
= pcm_sanity_check(substream
);
2110 runtime
= substream
->runtime
;
2111 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2113 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
&&
2114 runtime
->channels
> 1)
2116 return snd_pcm_lib_write1(substream
, (unsigned long)buf
, size
, nonblock
,
2117 snd_pcm_lib_write_transfer
);
2120 EXPORT_SYMBOL(snd_pcm_lib_write
);
2122 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream
*substream
,
2124 unsigned long data
, unsigned int off
,
2125 snd_pcm_uframes_t frames
)
2127 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2129 void __user
**bufs
= (void __user
**)data
;
2130 int channels
= runtime
->channels
;
2132 if (substream
->ops
->copy
) {
2133 if (snd_BUG_ON(!substream
->ops
->silence
))
2135 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2136 if (*bufs
== NULL
) {
2137 if ((err
= substream
->ops
->silence(substream
, c
, hwoff
, frames
)) < 0)
2140 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2141 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2146 /* default transfer behaviour */
2147 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
2148 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2149 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2150 if (*bufs
== NULL
) {
2151 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, frames
);
2153 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2154 if (copy_from_user(hwbuf
, buf
, samples_to_bytes(runtime
, frames
)))
2162 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
2164 snd_pcm_uframes_t frames
)
2166 struct snd_pcm_runtime
*runtime
;
2170 err
= pcm_sanity_check(substream
);
2173 runtime
= substream
->runtime
;
2174 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2176 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2178 return snd_pcm_lib_write1(substream
, (unsigned long)bufs
, frames
,
2179 nonblock
, snd_pcm_lib_writev_transfer
);
2182 EXPORT_SYMBOL(snd_pcm_lib_writev
);
2184 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream
*substream
,
2186 unsigned long data
, unsigned int off
,
2187 snd_pcm_uframes_t frames
)
2189 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2191 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
2192 if (substream
->ops
->copy
) {
2193 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
2196 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
2197 if (copy_to_user(buf
, hwbuf
, frames_to_bytes(runtime
, frames
)))
2203 static snd_pcm_sframes_t
snd_pcm_lib_read1(struct snd_pcm_substream
*substream
,
2205 snd_pcm_uframes_t size
,
2207 transfer_f transfer
)
2209 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2210 snd_pcm_uframes_t xfer
= 0;
2211 snd_pcm_uframes_t offset
= 0;
2212 snd_pcm_uframes_t avail
;
2218 snd_pcm_stream_lock_irq(substream
);
2219 switch (runtime
->status
->state
) {
2220 case SNDRV_PCM_STATE_PREPARED
:
2221 if (size
>= runtime
->start_threshold
) {
2222 err
= snd_pcm_start(substream
);
2227 case SNDRV_PCM_STATE_DRAINING
:
2228 case SNDRV_PCM_STATE_RUNNING
:
2229 case SNDRV_PCM_STATE_PAUSED
:
2231 case SNDRV_PCM_STATE_XRUN
:
2234 case SNDRV_PCM_STATE_SUSPENDED
:
2242 runtime
->twake
= runtime
->control
->avail_min
? : 1;
2243 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
2244 snd_pcm_update_hw_ptr(substream
);
2245 avail
= snd_pcm_capture_avail(runtime
);
2247 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
2248 snd_pcm_uframes_t cont
;
2250 if (runtime
->status
->state
==
2251 SNDRV_PCM_STATE_DRAINING
) {
2252 snd_pcm_stop(substream
, SNDRV_PCM_STATE_SETUP
);
2259 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
2260 runtime
->control
->avail_min
? : 1);
2261 err
= wait_for_avail(substream
, &avail
);
2265 continue; /* draining */
2267 frames
= size
> avail
? avail
: size
;
2268 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
2271 if (snd_BUG_ON(!frames
)) {
2273 snd_pcm_stream_unlock_irq(substream
);
2276 appl_ptr
= runtime
->control
->appl_ptr
;
2277 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2278 snd_pcm_stream_unlock_irq(substream
);
2279 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
2280 snd_pcm_stream_lock_irq(substream
);
2283 switch (runtime
->status
->state
) {
2284 case SNDRV_PCM_STATE_XRUN
:
2287 case SNDRV_PCM_STATE_SUSPENDED
:
2294 if (appl_ptr
>= runtime
->boundary
)
2295 appl_ptr
-= runtime
->boundary
;
2296 runtime
->control
->appl_ptr
= appl_ptr
;
2297 if (substream
->ops
->ack
)
2298 substream
->ops
->ack(substream
);
2307 if (xfer
> 0 && err
>= 0)
2308 snd_pcm_update_state(substream
, runtime
);
2309 snd_pcm_stream_unlock_irq(substream
);
2310 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2313 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
, void __user
*buf
, snd_pcm_uframes_t size
)
2315 struct snd_pcm_runtime
*runtime
;
2319 err
= pcm_sanity_check(substream
);
2322 runtime
= substream
->runtime
;
2323 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2324 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
2326 return snd_pcm_lib_read1(substream
, (unsigned long)buf
, size
, nonblock
, snd_pcm_lib_read_transfer
);
2329 EXPORT_SYMBOL(snd_pcm_lib_read
);
2331 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream
*substream
,
2333 unsigned long data
, unsigned int off
,
2334 snd_pcm_uframes_t frames
)
2336 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2338 void __user
**bufs
= (void __user
**)data
;
2339 int channels
= runtime
->channels
;
2341 if (substream
->ops
->copy
) {
2342 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2346 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2347 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2351 snd_pcm_uframes_t dma_csize
= runtime
->dma_bytes
/ channels
;
2352 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2358 hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2359 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2360 if (copy_to_user(buf
, hwbuf
, samples_to_bytes(runtime
, frames
)))
2367 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
2369 snd_pcm_uframes_t frames
)
2371 struct snd_pcm_runtime
*runtime
;
2375 err
= pcm_sanity_check(substream
);
2378 runtime
= substream
->runtime
;
2379 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2382 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2383 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2385 return snd_pcm_lib_read1(substream
, (unsigned long)bufs
, frames
, nonblock
, snd_pcm_lib_readv_transfer
);
2388 EXPORT_SYMBOL(snd_pcm_lib_readv
);
2391 * standard channel mapping helpers
2394 /* default channel maps for multi-channel playbacks, up to 8 channels */
2395 const struct snd_pcm_chmap_elem snd_pcm_std_chmaps
[] = {
2397 .map
= { SNDRV_CHMAP_MONO
} },
2399 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
} },
2401 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2402 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2404 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2405 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2406 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
} },
2408 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2409 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2410 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2411 SNDRV_CHMAP_SL
, SNDRV_CHMAP_SR
} },
2414 EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps
);
2416 /* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2417 const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps
[] = {
2419 .map
= { SNDRV_CHMAP_MONO
} },
2421 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
} },
2423 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2424 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2426 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2427 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2428 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2430 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2431 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2432 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2433 SNDRV_CHMAP_SL
, SNDRV_CHMAP_SR
} },
2436 EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps
);
2438 static bool valid_chmap_channels(const struct snd_pcm_chmap
*info
, int ch
)
2440 if (ch
> info
->max_channels
)
2442 return !info
->channel_mask
|| (info
->channel_mask
& (1U << ch
));
2445 static int pcm_chmap_ctl_info(struct snd_kcontrol
*kcontrol
,
2446 struct snd_ctl_elem_info
*uinfo
)
2448 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2450 uinfo
->type
= SNDRV_CTL_ELEM_TYPE_INTEGER
;
2452 uinfo
->count
= info
->max_channels
;
2453 uinfo
->value
.integer
.min
= 0;
2454 uinfo
->value
.integer
.max
= SNDRV_CHMAP_LAST
;
2458 /* get callback for channel map ctl element
2459 * stores the channel position firstly matching with the current channels
2461 static int pcm_chmap_ctl_get(struct snd_kcontrol
*kcontrol
,
2462 struct snd_ctl_elem_value
*ucontrol
)
2464 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2465 unsigned int idx
= snd_ctl_get_ioffidx(kcontrol
, &ucontrol
->id
);
2466 struct snd_pcm_substream
*substream
;
2467 const struct snd_pcm_chmap_elem
*map
;
2469 if (snd_BUG_ON(!info
->chmap
))
2471 substream
= snd_pcm_chmap_substream(info
, idx
);
2474 memset(ucontrol
->value
.integer
.value
, 0,
2475 sizeof(ucontrol
->value
.integer
.value
));
2476 if (!substream
->runtime
)
2477 return 0; /* no channels set */
2478 for (map
= info
->chmap
; map
->channels
; map
++) {
2480 if (map
->channels
== substream
->runtime
->channels
&&
2481 valid_chmap_channels(info
, map
->channels
)) {
2482 for (i
= 0; i
< map
->channels
; i
++)
2483 ucontrol
->value
.integer
.value
[i
] = map
->map
[i
];
2490 /* tlv callback for channel map ctl element
2491 * expands the pre-defined channel maps in a form of TLV
2493 static int pcm_chmap_ctl_tlv(struct snd_kcontrol
*kcontrol
, int op_flag
,
2494 unsigned int size
, unsigned int __user
*tlv
)
2496 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2497 const struct snd_pcm_chmap_elem
*map
;
2498 unsigned int __user
*dst
;
2501 if (snd_BUG_ON(!info
->chmap
))
2505 if (put_user(SNDRV_CTL_TLVT_CONTAINER
, tlv
))
2509 for (map
= info
->chmap
; map
->channels
; map
++) {
2510 int chs_bytes
= map
->channels
* 4;
2511 if (!valid_chmap_channels(info
, map
->channels
))
2515 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED
, dst
) ||
2516 put_user(chs_bytes
, dst
+ 1))
2521 if (size
< chs_bytes
)
2525 for (c
= 0; c
< map
->channels
; c
++) {
2526 if (put_user(map
->map
[c
], dst
))
2531 if (put_user(count
, tlv
+ 1))
2536 static void pcm_chmap_ctl_private_free(struct snd_kcontrol
*kcontrol
)
2538 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2539 info
->pcm
->streams
[info
->stream
].chmap_kctl
= NULL
;
2544 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2545 * @pcm: the assigned PCM instance
2546 * @stream: stream direction
2547 * @chmap: channel map elements (for query)
2548 * @max_channels: the max number of channels for the stream
2549 * @private_value: the value passed to each kcontrol's private_value field
2550 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2552 * Create channel-mapping control elements assigned to the given PCM stream(s).
2553 * Return: Zero if successful, or a negative error value.
2555 int snd_pcm_add_chmap_ctls(struct snd_pcm
*pcm
, int stream
,
2556 const struct snd_pcm_chmap_elem
*chmap
,
2558 unsigned long private_value
,
2559 struct snd_pcm_chmap
**info_ret
)
2561 struct snd_pcm_chmap
*info
;
2562 struct snd_kcontrol_new knew
= {
2563 .iface
= SNDRV_CTL_ELEM_IFACE_PCM
,
2564 .access
= SNDRV_CTL_ELEM_ACCESS_READ
|
2565 SNDRV_CTL_ELEM_ACCESS_TLV_READ
|
2566 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK
,
2567 .info
= pcm_chmap_ctl_info
,
2568 .get
= pcm_chmap_ctl_get
,
2569 .tlv
.c
= pcm_chmap_ctl_tlv
,
2573 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
2577 info
->stream
= stream
;
2578 info
->chmap
= chmap
;
2579 info
->max_channels
= max_channels
;
2580 if (stream
== SNDRV_PCM_STREAM_PLAYBACK
)
2581 knew
.name
= "Playback Channel Map";
2583 knew
.name
= "Capture Channel Map";
2584 knew
.device
= pcm
->device
;
2585 knew
.count
= pcm
->streams
[stream
].substream_count
;
2586 knew
.private_value
= private_value
;
2587 info
->kctl
= snd_ctl_new1(&knew
, info
);
2592 info
->kctl
->private_free
= pcm_chmap_ctl_private_free
;
2593 err
= snd_ctl_add(pcm
->card
, info
->kctl
);
2596 pcm
->streams
[stream
].chmap_kctl
= info
->kctl
;
2601 EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls
);