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
;
368 if (hdelta
> runtime
->hw_ptr_buffer_jiffies
/2) {
369 hw_base
+= runtime
->buffer_size
;
370 if (hw_base
>= runtime
->boundary
) {
374 new_hw_ptr
= hw_base
+ pos
;
379 /* new_hw_ptr might be lower than old_hw_ptr in case when */
380 /* pointer crosses the end of the ring buffer */
381 if (new_hw_ptr
< old_hw_ptr
) {
382 hw_base
+= runtime
->buffer_size
;
383 if (hw_base
>= runtime
->boundary
) {
387 new_hw_ptr
= hw_base
+ pos
;
390 delta
= new_hw_ptr
- old_hw_ptr
;
392 delta
+= runtime
->boundary
;
393 if (xrun_debug(substream
, in_interrupt
?
394 XRUN_DEBUG_PERIODUPDATE
: XRUN_DEBUG_HWPTRUPDATE
)) {
396 snd_pcm_debug_name(substream
, name
, sizeof(name
));
397 snd_printd("%s_update: %s: pos=%u/%u/%u, "
398 "hwptr=%ld/%ld/%ld/%ld\n",
399 in_interrupt
? "period" : "hwptr",
402 (unsigned int)runtime
->period_size
,
403 (unsigned int)runtime
->buffer_size
,
404 (unsigned long)delta
,
405 (unsigned long)old_hw_ptr
,
406 (unsigned long)new_hw_ptr
,
407 (unsigned long)runtime
->hw_ptr_base
);
410 if (runtime
->no_period_wakeup
) {
411 snd_pcm_sframes_t xrun_threshold
;
413 * Without regular period interrupts, we have to check
414 * the elapsed time to detect xruns.
416 jdelta
= curr_jiffies
- runtime
->hw_ptr_jiffies
;
417 if (jdelta
< runtime
->hw_ptr_buffer_jiffies
/ 2)
419 hdelta
= jdelta
- delta
* HZ
/ runtime
->rate
;
420 xrun_threshold
= runtime
->hw_ptr_buffer_jiffies
/ 2 + 1;
421 while (hdelta
> xrun_threshold
) {
422 delta
+= runtime
->buffer_size
;
423 hw_base
+= runtime
->buffer_size
;
424 if (hw_base
>= runtime
->boundary
) {
428 new_hw_ptr
= hw_base
+ pos
;
429 hdelta
-= runtime
->hw_ptr_buffer_jiffies
;
434 /* something must be really wrong */
435 if (delta
>= runtime
->buffer_size
+ runtime
->period_size
) {
436 hw_ptr_error(substream
,
437 "Unexpected hw_pointer value %s"
438 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
440 in_interrupt
? "[Q] " : "[P]",
441 substream
->stream
, (long)pos
,
442 (long)new_hw_ptr
, (long)old_hw_ptr
);
446 /* Do jiffies check only in xrun_debug mode */
447 if (!xrun_debug(substream
, XRUN_DEBUG_JIFFIESCHECK
))
448 goto no_jiffies_check
;
450 /* Skip the jiffies check for hardwares with BATCH flag.
451 * Such hardware usually just increases the position at each IRQ,
452 * thus it can't give any strange position.
454 if (runtime
->hw
.info
& SNDRV_PCM_INFO_BATCH
)
455 goto no_jiffies_check
;
457 if (hdelta
< runtime
->delay
)
458 goto no_jiffies_check
;
459 hdelta
-= runtime
->delay
;
460 jdelta
= curr_jiffies
- runtime
->hw_ptr_jiffies
;
461 if (((hdelta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
463 (((runtime
->period_size
* HZ
) / runtime
->rate
)
465 /* move new_hw_ptr according jiffies not pos variable */
466 new_hw_ptr
= old_hw_ptr
;
468 /* use loop to avoid checks for delta overflows */
469 /* the delta value is small or zero in most cases */
471 new_hw_ptr
+= runtime
->period_size
;
472 if (new_hw_ptr
>= runtime
->boundary
) {
473 new_hw_ptr
-= runtime
->boundary
;
478 /* align hw_base to buffer_size */
479 hw_ptr_error(substream
,
480 "hw_ptr skipping! %s"
481 "(pos=%ld, delta=%ld, period=%ld, "
482 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
483 in_interrupt
? "[Q] " : "",
484 (long)pos
, (long)hdelta
,
485 (long)runtime
->period_size
, jdelta
,
486 ((hdelta
* HZ
) / runtime
->rate
), hw_base
,
487 (unsigned long)old_hw_ptr
,
488 (unsigned long)new_hw_ptr
);
489 /* reset values to proper state */
491 hw_base
= new_hw_ptr
- (new_hw_ptr
% runtime
->buffer_size
);
494 if (delta
> runtime
->period_size
+ runtime
->period_size
/ 2) {
495 hw_ptr_error(substream
,
496 "Lost interrupts? %s"
497 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
499 in_interrupt
? "[Q] " : "",
500 substream
->stream
, (long)delta
,
506 if (runtime
->status
->hw_ptr
== new_hw_ptr
)
509 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
510 runtime
->silence_size
> 0)
511 snd_pcm_playback_silence(substream
, new_hw_ptr
);
514 delta
= new_hw_ptr
- runtime
->hw_ptr_interrupt
;
516 delta
+= runtime
->boundary
;
517 delta
-= (snd_pcm_uframes_t
)delta
% runtime
->period_size
;
518 runtime
->hw_ptr_interrupt
+= delta
;
519 if (runtime
->hw_ptr_interrupt
>= runtime
->boundary
)
520 runtime
->hw_ptr_interrupt
-= runtime
->boundary
;
522 runtime
->hw_ptr_base
= hw_base
;
523 runtime
->status
->hw_ptr
= new_hw_ptr
;
524 runtime
->hw_ptr_jiffies
= curr_jiffies
;
525 if (crossed_boundary
) {
526 snd_BUG_ON(crossed_boundary
!= 1);
527 runtime
->hw_ptr_wrap
+= runtime
->boundary
;
529 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
) {
530 runtime
->status
->tstamp
= curr_tstamp
;
532 if (!(runtime
->hw
.info
& SNDRV_PCM_INFO_HAS_WALL_CLOCK
)) {
534 * no wall clock available, provide audio timestamp
535 * derived from pointer position+delay
537 u64 audio_frames
, audio_nsecs
;
539 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
540 audio_frames
= runtime
->hw_ptr_wrap
541 + runtime
->status
->hw_ptr
544 audio_frames
= runtime
->hw_ptr_wrap
545 + runtime
->status
->hw_ptr
547 audio_nsecs
= div_u64(audio_frames
* 1000000000LL,
549 audio_tstamp
= ns_to_timespec(audio_nsecs
);
551 runtime
->status
->audio_tstamp
= audio_tstamp
;
554 return snd_pcm_update_state(substream
, runtime
);
557 /* CAUTION: call it with irq disabled */
558 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
)
560 return snd_pcm_update_hw_ptr0(substream
, 0);
564 * snd_pcm_set_ops - set the PCM operators
565 * @pcm: the pcm instance
566 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
567 * @ops: the operator table
569 * Sets the given PCM operators to the pcm instance.
571 void snd_pcm_set_ops(struct snd_pcm
*pcm
, int direction
, struct snd_pcm_ops
*ops
)
573 struct snd_pcm_str
*stream
= &pcm
->streams
[direction
];
574 struct snd_pcm_substream
*substream
;
576 for (substream
= stream
->substream
; substream
!= NULL
; substream
= substream
->next
)
577 substream
->ops
= ops
;
580 EXPORT_SYMBOL(snd_pcm_set_ops
);
583 * snd_pcm_sync - set the PCM sync id
584 * @substream: the pcm substream
586 * Sets the PCM sync identifier for the card.
588 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
)
590 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
592 runtime
->sync
.id32
[0] = substream
->pcm
->card
->number
;
593 runtime
->sync
.id32
[1] = -1;
594 runtime
->sync
.id32
[2] = -1;
595 runtime
->sync
.id32
[3] = -1;
598 EXPORT_SYMBOL(snd_pcm_set_sync
);
601 * Standard ioctl routine
604 static inline unsigned int div32(unsigned int a
, unsigned int b
,
615 static inline unsigned int div_down(unsigned int a
, unsigned int b
)
622 static inline unsigned int div_up(unsigned int a
, unsigned int b
)
634 static inline unsigned int mul(unsigned int a
, unsigned int b
)
638 if (div_down(UINT_MAX
, a
) < b
)
643 static inline unsigned int muldiv32(unsigned int a
, unsigned int b
,
644 unsigned int c
, unsigned int *r
)
646 u_int64_t n
= (u_int64_t
) a
* b
;
652 n
= div_u64_rem(n
, c
, r
);
661 * snd_interval_refine - refine the interval value of configurator
662 * @i: the interval value to refine
663 * @v: the interval value to refer to
665 * Refines the interval value with the reference value.
666 * The interval is changed to the range satisfying both intervals.
667 * The interval status (min, max, integer, etc.) are evaluated.
669 * Returns non-zero if the value is changed, zero if not changed.
671 int snd_interval_refine(struct snd_interval
*i
, const struct snd_interval
*v
)
674 if (snd_BUG_ON(snd_interval_empty(i
)))
676 if (i
->min
< v
->min
) {
678 i
->openmin
= v
->openmin
;
680 } else if (i
->min
== v
->min
&& !i
->openmin
&& v
->openmin
) {
684 if (i
->max
> v
->max
) {
686 i
->openmax
= v
->openmax
;
688 } else if (i
->max
== v
->max
&& !i
->openmax
&& v
->openmax
) {
692 if (!i
->integer
&& v
->integer
) {
705 } else if (!i
->openmin
&& !i
->openmax
&& i
->min
== i
->max
)
707 if (snd_interval_checkempty(i
)) {
708 snd_interval_none(i
);
714 EXPORT_SYMBOL(snd_interval_refine
);
716 static int snd_interval_refine_first(struct snd_interval
*i
)
718 if (snd_BUG_ON(snd_interval_empty(i
)))
720 if (snd_interval_single(i
))
723 i
->openmax
= i
->openmin
;
729 static int snd_interval_refine_last(struct snd_interval
*i
)
731 if (snd_BUG_ON(snd_interval_empty(i
)))
733 if (snd_interval_single(i
))
736 i
->openmin
= i
->openmax
;
742 void snd_interval_mul(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
744 if (a
->empty
|| b
->empty
) {
745 snd_interval_none(c
);
749 c
->min
= mul(a
->min
, b
->min
);
750 c
->openmin
= (a
->openmin
|| b
->openmin
);
751 c
->max
= mul(a
->max
, b
->max
);
752 c
->openmax
= (a
->openmax
|| b
->openmax
);
753 c
->integer
= (a
->integer
&& b
->integer
);
757 * snd_interval_div - refine the interval value with division
764 * Returns non-zero if the value is changed, zero if not changed.
766 void snd_interval_div(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
769 if (a
->empty
|| b
->empty
) {
770 snd_interval_none(c
);
774 c
->min
= div32(a
->min
, b
->max
, &r
);
775 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
777 c
->max
= div32(a
->max
, b
->min
, &r
);
782 c
->openmax
= (a
->openmax
|| b
->openmin
);
791 * snd_interval_muldivk - refine the interval value
794 * @k: divisor (as integer)
799 * Returns non-zero if the value is changed, zero if not changed.
801 void snd_interval_muldivk(const struct snd_interval
*a
, const struct snd_interval
*b
,
802 unsigned int k
, struct snd_interval
*c
)
805 if (a
->empty
|| b
->empty
) {
806 snd_interval_none(c
);
810 c
->min
= muldiv32(a
->min
, b
->min
, k
, &r
);
811 c
->openmin
= (r
|| a
->openmin
|| b
->openmin
);
812 c
->max
= muldiv32(a
->max
, b
->max
, k
, &r
);
817 c
->openmax
= (a
->openmax
|| b
->openmax
);
822 * snd_interval_mulkdiv - refine the interval value
824 * @k: dividend 2 (as integer)
830 * Returns non-zero if the value is changed, zero if not changed.
832 void snd_interval_mulkdiv(const struct snd_interval
*a
, unsigned int k
,
833 const struct snd_interval
*b
, struct snd_interval
*c
)
836 if (a
->empty
|| b
->empty
) {
837 snd_interval_none(c
);
841 c
->min
= muldiv32(a
->min
, k
, b
->max
, &r
);
842 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
844 c
->max
= muldiv32(a
->max
, k
, b
->min
, &r
);
849 c
->openmax
= (a
->openmax
|| b
->openmin
);
861 * snd_interval_ratnum - refine the interval value
862 * @i: interval to refine
863 * @rats_count: number of ratnum_t
864 * @rats: ratnum_t array
865 * @nump: pointer to store the resultant numerator
866 * @denp: pointer to store the resultant denominator
868 * Returns non-zero if the value is changed, zero if not changed.
870 int snd_interval_ratnum(struct snd_interval
*i
,
871 unsigned int rats_count
, struct snd_ratnum
*rats
,
872 unsigned int *nump
, unsigned int *denp
)
874 unsigned int best_num
, best_den
;
877 struct snd_interval t
;
879 unsigned int result_num
, result_den
;
882 best_num
= best_den
= best_diff
= 0;
883 for (k
= 0; k
< rats_count
; ++k
) {
884 unsigned int num
= rats
[k
].num
;
886 unsigned int q
= i
->min
;
890 den
= div_up(num
, q
);
891 if (den
< rats
[k
].den_min
)
893 if (den
> rats
[k
].den_max
)
894 den
= rats
[k
].den_max
;
897 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
901 diff
= num
- q
* den
;
905 diff
* best_den
< best_diff
* den
) {
915 t
.min
= div_down(best_num
, best_den
);
916 t
.openmin
= !!(best_num
% best_den
);
918 result_num
= best_num
;
919 result_diff
= best_diff
;
920 result_den
= best_den
;
921 best_num
= best_den
= best_diff
= 0;
922 for (k
= 0; k
< rats_count
; ++k
) {
923 unsigned int num
= rats
[k
].num
;
925 unsigned int q
= i
->max
;
931 den
= div_down(num
, q
);
932 if (den
> rats
[k
].den_max
)
934 if (den
< rats
[k
].den_min
)
935 den
= rats
[k
].den_min
;
938 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
940 den
+= rats
[k
].den_step
- r
;
942 diff
= q
* den
- num
;
946 diff
* best_den
< best_diff
* den
) {
956 t
.max
= div_up(best_num
, best_den
);
957 t
.openmax
= !!(best_num
% best_den
);
959 err
= snd_interval_refine(i
, &t
);
963 if (snd_interval_single(i
)) {
964 if (best_diff
* result_den
< result_diff
* best_den
) {
965 result_num
= best_num
;
966 result_den
= best_den
;
976 EXPORT_SYMBOL(snd_interval_ratnum
);
979 * snd_interval_ratden - refine the interval value
980 * @i: interval to refine
981 * @rats_count: number of struct ratden
982 * @rats: struct ratden array
983 * @nump: pointer to store the resultant numerator
984 * @denp: pointer to store the resultant denominator
986 * Returns non-zero if the value is changed, zero if not changed.
988 static int snd_interval_ratden(struct snd_interval
*i
,
989 unsigned int rats_count
, struct snd_ratden
*rats
,
990 unsigned int *nump
, unsigned int *denp
)
992 unsigned int best_num
, best_diff
, best_den
;
994 struct snd_interval t
;
997 best_num
= best_den
= best_diff
= 0;
998 for (k
= 0; k
< rats_count
; ++k
) {
1000 unsigned int den
= rats
[k
].den
;
1001 unsigned int q
= i
->min
;
1004 if (num
> rats
[k
].num_max
)
1006 if (num
< rats
[k
].num_min
)
1007 num
= rats
[k
].num_max
;
1010 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
1012 num
+= rats
[k
].num_step
- r
;
1014 diff
= num
- q
* den
;
1015 if (best_num
== 0 ||
1016 diff
* best_den
< best_diff
* den
) {
1022 if (best_den
== 0) {
1026 t
.min
= div_down(best_num
, best_den
);
1027 t
.openmin
= !!(best_num
% best_den
);
1029 best_num
= best_den
= best_diff
= 0;
1030 for (k
= 0; k
< rats_count
; ++k
) {
1032 unsigned int den
= rats
[k
].den
;
1033 unsigned int q
= i
->max
;
1036 if (num
< rats
[k
].num_min
)
1038 if (num
> rats
[k
].num_max
)
1039 num
= rats
[k
].num_max
;
1042 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
1046 diff
= q
* den
- num
;
1047 if (best_num
== 0 ||
1048 diff
* best_den
< best_diff
* den
) {
1054 if (best_den
== 0) {
1058 t
.max
= div_up(best_num
, best_den
);
1059 t
.openmax
= !!(best_num
% best_den
);
1061 err
= snd_interval_refine(i
, &t
);
1065 if (snd_interval_single(i
)) {
1075 * snd_interval_list - refine the interval value from the list
1076 * @i: the interval value to refine
1077 * @count: the number of elements in the list
1078 * @list: the value list
1079 * @mask: the bit-mask to evaluate
1081 * Refines the interval value from the list.
1082 * When mask is non-zero, only the elements corresponding to bit 1 are
1085 * Returns non-zero if the value is changed, zero if not changed.
1087 int snd_interval_list(struct snd_interval
*i
, unsigned int count
,
1088 const unsigned int *list
, unsigned int mask
)
1091 struct snd_interval list_range
;
1097 snd_interval_any(&list_range
);
1098 list_range
.min
= UINT_MAX
;
1100 for (k
= 0; k
< count
; k
++) {
1101 if (mask
&& !(mask
& (1 << k
)))
1103 if (!snd_interval_test(i
, list
[k
]))
1105 list_range
.min
= min(list_range
.min
, list
[k
]);
1106 list_range
.max
= max(list_range
.max
, list
[k
]);
1108 return snd_interval_refine(i
, &list_range
);
1111 EXPORT_SYMBOL(snd_interval_list
);
1113 static int snd_interval_step(struct snd_interval
*i
, unsigned int min
, unsigned int step
)
1117 n
= (i
->min
- min
) % step
;
1118 if (n
!= 0 || i
->openmin
) {
1122 n
= (i
->max
- min
) % step
;
1123 if (n
!= 0 || i
->openmax
) {
1127 if (snd_interval_checkempty(i
)) {
1134 /* Info constraints helpers */
1137 * snd_pcm_hw_rule_add - add the hw-constraint rule
1138 * @runtime: the pcm runtime instance
1139 * @cond: condition bits
1140 * @var: the variable to evaluate
1141 * @func: the evaluation function
1142 * @private: the private data pointer passed to function
1143 * @dep: the dependent variables
1145 * Returns zero if successful, or a negative error code on failure.
1147 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
, unsigned int cond
,
1149 snd_pcm_hw_rule_func_t func
, void *private,
1152 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1153 struct snd_pcm_hw_rule
*c
;
1156 va_start(args
, dep
);
1157 if (constrs
->rules_num
>= constrs
->rules_all
) {
1158 struct snd_pcm_hw_rule
*new;
1159 unsigned int new_rules
= constrs
->rules_all
+ 16;
1160 new = kcalloc(new_rules
, sizeof(*c
), GFP_KERNEL
);
1165 if (constrs
->rules
) {
1166 memcpy(new, constrs
->rules
,
1167 constrs
->rules_num
* sizeof(*c
));
1168 kfree(constrs
->rules
);
1170 constrs
->rules
= new;
1171 constrs
->rules_all
= new_rules
;
1173 c
= &constrs
->rules
[constrs
->rules_num
];
1177 c
->private = private;
1180 if (snd_BUG_ON(k
>= ARRAY_SIZE(c
->deps
))) {
1187 dep
= va_arg(args
, int);
1189 constrs
->rules_num
++;
1194 EXPORT_SYMBOL(snd_pcm_hw_rule_add
);
1197 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1198 * @runtime: PCM runtime instance
1199 * @var: hw_params variable to apply the mask
1200 * @mask: the bitmap mask
1202 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1204 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1207 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1208 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1209 *maskp
->bits
&= mask
;
1210 memset(maskp
->bits
+ 1, 0, (SNDRV_MASK_MAX
-32) / 8); /* clear rest */
1211 if (*maskp
->bits
== 0)
1217 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1218 * @runtime: PCM runtime instance
1219 * @var: hw_params variable to apply the mask
1220 * @mask: the 64bit bitmap mask
1222 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1224 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1227 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1228 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1229 maskp
->bits
[0] &= (u_int32_t
)mask
;
1230 maskp
->bits
[1] &= (u_int32_t
)(mask
>> 32);
1231 memset(maskp
->bits
+ 2, 0, (SNDRV_MASK_MAX
-64) / 8); /* clear rest */
1232 if (! maskp
->bits
[0] && ! maskp
->bits
[1])
1238 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1239 * @runtime: PCM runtime instance
1240 * @var: hw_params variable to apply the integer constraint
1242 * Apply the constraint of integer to an interval parameter.
1244 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
)
1246 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1247 return snd_interval_setinteger(constrs_interval(constrs
, var
));
1250 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer
);
1253 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1254 * @runtime: PCM runtime instance
1255 * @var: hw_params variable to apply the range
1256 * @min: the minimal value
1257 * @max: the maximal value
1259 * Apply the min/max range constraint to an interval parameter.
1261 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1262 unsigned int min
, unsigned int max
)
1264 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1265 struct snd_interval t
;
1268 t
.openmin
= t
.openmax
= 0;
1270 return snd_interval_refine(constrs_interval(constrs
, var
), &t
);
1273 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax
);
1275 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params
*params
,
1276 struct snd_pcm_hw_rule
*rule
)
1278 struct snd_pcm_hw_constraint_list
*list
= rule
->private;
1279 return snd_interval_list(hw_param_interval(params
, rule
->var
), list
->count
, list
->list
, list
->mask
);
1284 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1285 * @runtime: PCM runtime instance
1286 * @cond: condition bits
1287 * @var: hw_params variable to apply the list constraint
1290 * Apply the list of constraints to an interval parameter.
1292 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
1294 snd_pcm_hw_param_t var
,
1295 const struct snd_pcm_hw_constraint_list
*l
)
1297 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1298 snd_pcm_hw_rule_list
, (void *)l
,
1302 EXPORT_SYMBOL(snd_pcm_hw_constraint_list
);
1304 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params
*params
,
1305 struct snd_pcm_hw_rule
*rule
)
1307 struct snd_pcm_hw_constraint_ratnums
*r
= rule
->private;
1308 unsigned int num
= 0, den
= 0;
1310 err
= snd_interval_ratnum(hw_param_interval(params
, rule
->var
),
1311 r
->nrats
, r
->rats
, &num
, &den
);
1312 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1313 params
->rate_num
= num
;
1314 params
->rate_den
= den
;
1320 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1321 * @runtime: PCM runtime instance
1322 * @cond: condition bits
1323 * @var: hw_params variable to apply the ratnums constraint
1324 * @r: struct snd_ratnums constriants
1326 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
1328 snd_pcm_hw_param_t var
,
1329 struct snd_pcm_hw_constraint_ratnums
*r
)
1331 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1332 snd_pcm_hw_rule_ratnums
, r
,
1336 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums
);
1338 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params
*params
,
1339 struct snd_pcm_hw_rule
*rule
)
1341 struct snd_pcm_hw_constraint_ratdens
*r
= rule
->private;
1342 unsigned int num
= 0, den
= 0;
1343 int err
= snd_interval_ratden(hw_param_interval(params
, rule
->var
),
1344 r
->nrats
, r
->rats
, &num
, &den
);
1345 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1346 params
->rate_num
= num
;
1347 params
->rate_den
= den
;
1353 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1354 * @runtime: PCM runtime instance
1355 * @cond: condition bits
1356 * @var: hw_params variable to apply the ratdens constraint
1357 * @r: struct snd_ratdens constriants
1359 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
1361 snd_pcm_hw_param_t var
,
1362 struct snd_pcm_hw_constraint_ratdens
*r
)
1364 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1365 snd_pcm_hw_rule_ratdens
, r
,
1369 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens
);
1371 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params
*params
,
1372 struct snd_pcm_hw_rule
*rule
)
1374 unsigned int l
= (unsigned long) rule
->private;
1375 int width
= l
& 0xffff;
1376 unsigned int msbits
= l
>> 16;
1377 struct snd_interval
*i
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_SAMPLE_BITS
);
1378 if (snd_interval_single(i
) && snd_interval_value(i
) == width
)
1379 params
->msbits
= msbits
;
1384 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1385 * @runtime: PCM runtime instance
1386 * @cond: condition bits
1387 * @width: sample bits width
1388 * @msbits: msbits width
1390 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
1393 unsigned int msbits
)
1395 unsigned long l
= (msbits
<< 16) | width
;
1396 return snd_pcm_hw_rule_add(runtime
, cond
, -1,
1397 snd_pcm_hw_rule_msbits
,
1399 SNDRV_PCM_HW_PARAM_SAMPLE_BITS
, -1);
1402 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits
);
1404 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params
*params
,
1405 struct snd_pcm_hw_rule
*rule
)
1407 unsigned long step
= (unsigned long) rule
->private;
1408 return snd_interval_step(hw_param_interval(params
, rule
->var
), 0, step
);
1412 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1413 * @runtime: PCM runtime instance
1414 * @cond: condition bits
1415 * @var: hw_params variable to apply the step constraint
1418 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
1420 snd_pcm_hw_param_t var
,
1423 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1424 snd_pcm_hw_rule_step
, (void *) step
,
1428 EXPORT_SYMBOL(snd_pcm_hw_constraint_step
);
1430 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params
*params
, struct snd_pcm_hw_rule
*rule
)
1432 static unsigned int pow2_sizes
[] = {
1433 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1434 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1435 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1436 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1438 return snd_interval_list(hw_param_interval(params
, rule
->var
),
1439 ARRAY_SIZE(pow2_sizes
), pow2_sizes
, 0);
1443 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1444 * @runtime: PCM runtime instance
1445 * @cond: condition bits
1446 * @var: hw_params variable to apply the power-of-2 constraint
1448 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
1450 snd_pcm_hw_param_t var
)
1452 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1453 snd_pcm_hw_rule_pow2
, NULL
,
1457 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2
);
1459 static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params
*params
,
1460 struct snd_pcm_hw_rule
*rule
)
1462 unsigned int base_rate
= (unsigned int)(uintptr_t)rule
->private;
1463 struct snd_interval
*rate
;
1465 rate
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
1466 return snd_interval_list(rate
, 1, &base_rate
, 0);
1470 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1471 * @runtime: PCM runtime instance
1472 * @base_rate: the rate at which the hardware does not resample
1474 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime
*runtime
,
1475 unsigned int base_rate
)
1477 return snd_pcm_hw_rule_add(runtime
, SNDRV_PCM_HW_PARAMS_NORESAMPLE
,
1478 SNDRV_PCM_HW_PARAM_RATE
,
1479 snd_pcm_hw_rule_noresample_func
,
1480 (void *)(uintptr_t)base_rate
,
1481 SNDRV_PCM_HW_PARAM_RATE
, -1);
1483 EXPORT_SYMBOL(snd_pcm_hw_rule_noresample
);
1485 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params
*params
,
1486 snd_pcm_hw_param_t var
)
1488 if (hw_is_mask(var
)) {
1489 snd_mask_any(hw_param_mask(params
, var
));
1490 params
->cmask
|= 1 << var
;
1491 params
->rmask
|= 1 << var
;
1494 if (hw_is_interval(var
)) {
1495 snd_interval_any(hw_param_interval(params
, var
));
1496 params
->cmask
|= 1 << var
;
1497 params
->rmask
|= 1 << var
;
1503 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
)
1506 memset(params
, 0, sizeof(*params
));
1507 for (k
= SNDRV_PCM_HW_PARAM_FIRST_MASK
; k
<= SNDRV_PCM_HW_PARAM_LAST_MASK
; k
++)
1508 _snd_pcm_hw_param_any(params
, k
);
1509 for (k
= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
; k
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
; k
++)
1510 _snd_pcm_hw_param_any(params
, k
);
1514 EXPORT_SYMBOL(_snd_pcm_hw_params_any
);
1517 * snd_pcm_hw_param_value - return @params field @var value
1518 * @params: the hw_params instance
1519 * @var: parameter to retrieve
1520 * @dir: pointer to the direction (-1,0,1) or %NULL
1522 * Return the value for field @var if it's fixed in configuration space
1523 * defined by @params. Return -%EINVAL otherwise.
1525 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
1526 snd_pcm_hw_param_t var
, int *dir
)
1528 if (hw_is_mask(var
)) {
1529 const struct snd_mask
*mask
= hw_param_mask_c(params
, var
);
1530 if (!snd_mask_single(mask
))
1534 return snd_mask_value(mask
);
1536 if (hw_is_interval(var
)) {
1537 const struct snd_interval
*i
= hw_param_interval_c(params
, var
);
1538 if (!snd_interval_single(i
))
1542 return snd_interval_value(i
);
1547 EXPORT_SYMBOL(snd_pcm_hw_param_value
);
1549 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
,
1550 snd_pcm_hw_param_t var
)
1552 if (hw_is_mask(var
)) {
1553 snd_mask_none(hw_param_mask(params
, var
));
1554 params
->cmask
|= 1 << var
;
1555 params
->rmask
|= 1 << var
;
1556 } else if (hw_is_interval(var
)) {
1557 snd_interval_none(hw_param_interval(params
, var
));
1558 params
->cmask
|= 1 << var
;
1559 params
->rmask
|= 1 << var
;
1565 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty
);
1567 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params
*params
,
1568 snd_pcm_hw_param_t var
)
1571 if (hw_is_mask(var
))
1572 changed
= snd_mask_refine_first(hw_param_mask(params
, var
));
1573 else if (hw_is_interval(var
))
1574 changed
= snd_interval_refine_first(hw_param_interval(params
, var
));
1578 params
->cmask
|= 1 << var
;
1579 params
->rmask
|= 1 << var
;
1586 * snd_pcm_hw_param_first - refine config space and return minimum value
1587 * @pcm: PCM instance
1588 * @params: the hw_params instance
1589 * @var: parameter to retrieve
1590 * @dir: pointer to the direction (-1,0,1) or %NULL
1592 * Inside configuration space defined by @params remove from @var all
1593 * values > minimum. Reduce configuration space accordingly.
1594 * Return the minimum.
1596 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
1597 struct snd_pcm_hw_params
*params
,
1598 snd_pcm_hw_param_t var
, int *dir
)
1600 int changed
= _snd_pcm_hw_param_first(params
, var
);
1603 if (params
->rmask
) {
1604 int err
= snd_pcm_hw_refine(pcm
, params
);
1605 if (snd_BUG_ON(err
< 0))
1608 return snd_pcm_hw_param_value(params
, var
, dir
);
1611 EXPORT_SYMBOL(snd_pcm_hw_param_first
);
1613 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params
*params
,
1614 snd_pcm_hw_param_t var
)
1617 if (hw_is_mask(var
))
1618 changed
= snd_mask_refine_last(hw_param_mask(params
, var
));
1619 else if (hw_is_interval(var
))
1620 changed
= snd_interval_refine_last(hw_param_interval(params
, var
));
1624 params
->cmask
|= 1 << var
;
1625 params
->rmask
|= 1 << var
;
1632 * snd_pcm_hw_param_last - refine config space and return maximum value
1633 * @pcm: PCM instance
1634 * @params: the hw_params instance
1635 * @var: parameter to retrieve
1636 * @dir: pointer to the direction (-1,0,1) or %NULL
1638 * Inside configuration space defined by @params remove from @var all
1639 * values < maximum. Reduce configuration space accordingly.
1640 * Return the maximum.
1642 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
1643 struct snd_pcm_hw_params
*params
,
1644 snd_pcm_hw_param_t var
, int *dir
)
1646 int changed
= _snd_pcm_hw_param_last(params
, var
);
1649 if (params
->rmask
) {
1650 int err
= snd_pcm_hw_refine(pcm
, params
);
1651 if (snd_BUG_ON(err
< 0))
1654 return snd_pcm_hw_param_value(params
, var
, dir
);
1657 EXPORT_SYMBOL(snd_pcm_hw_param_last
);
1660 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1661 * @pcm: PCM instance
1662 * @params: the hw_params instance
1664 * Choose one configuration from configuration space defined by @params.
1665 * The configuration chosen is that obtained fixing in this order:
1666 * first access, first format, first subformat, min channels,
1667 * min rate, min period time, max buffer size, min tick time
1669 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*pcm
,
1670 struct snd_pcm_hw_params
*params
)
1672 static int vars
[] = {
1673 SNDRV_PCM_HW_PARAM_ACCESS
,
1674 SNDRV_PCM_HW_PARAM_FORMAT
,
1675 SNDRV_PCM_HW_PARAM_SUBFORMAT
,
1676 SNDRV_PCM_HW_PARAM_CHANNELS
,
1677 SNDRV_PCM_HW_PARAM_RATE
,
1678 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1679 SNDRV_PCM_HW_PARAM_BUFFER_SIZE
,
1680 SNDRV_PCM_HW_PARAM_TICK_TIME
,
1685 for (v
= vars
; *v
!= -1; v
++) {
1686 if (*v
!= SNDRV_PCM_HW_PARAM_BUFFER_SIZE
)
1687 err
= snd_pcm_hw_param_first(pcm
, params
, *v
, NULL
);
1689 err
= snd_pcm_hw_param_last(pcm
, params
, *v
, NULL
);
1690 if (snd_BUG_ON(err
< 0))
1696 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream
*substream
,
1699 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1700 unsigned long flags
;
1701 snd_pcm_stream_lock_irqsave(substream
, flags
);
1702 if (snd_pcm_running(substream
) &&
1703 snd_pcm_update_hw_ptr(substream
) >= 0)
1704 runtime
->status
->hw_ptr
%= runtime
->buffer_size
;
1706 runtime
->status
->hw_ptr
= 0;
1707 runtime
->hw_ptr_wrap
= 0;
1709 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1713 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream
*substream
,
1716 struct snd_pcm_channel_info
*info
= arg
;
1717 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1719 if (!(runtime
->info
& SNDRV_PCM_INFO_MMAP
)) {
1723 width
= snd_pcm_format_physical_width(runtime
->format
);
1727 switch (runtime
->access
) {
1728 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
:
1729 case SNDRV_PCM_ACCESS_RW_INTERLEAVED
:
1730 info
->first
= info
->channel
* width
;
1731 info
->step
= runtime
->channels
* width
;
1733 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED
:
1734 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
:
1736 size_t size
= runtime
->dma_bytes
/ runtime
->channels
;
1737 info
->first
= info
->channel
* size
* 8;
1748 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream
*substream
,
1751 struct snd_pcm_hw_params
*params
= arg
;
1752 snd_pcm_format_t format
;
1753 int channels
, width
;
1755 params
->fifo_size
= substream
->runtime
->hw
.fifo_size
;
1756 if (!(substream
->runtime
->hw
.info
& SNDRV_PCM_INFO_FIFO_IN_FRAMES
)) {
1757 format
= params_format(params
);
1758 channels
= params_channels(params
);
1759 width
= snd_pcm_format_physical_width(format
);
1760 params
->fifo_size
/= width
* channels
;
1766 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1767 * @substream: the pcm substream instance
1768 * @cmd: ioctl command
1769 * @arg: ioctl argument
1771 * Processes the generic ioctl commands for PCM.
1772 * Can be passed as the ioctl callback for PCM ops.
1774 * Returns zero if successful, or a negative error code on failure.
1776 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
1777 unsigned int cmd
, void *arg
)
1780 case SNDRV_PCM_IOCTL1_INFO
:
1782 case SNDRV_PCM_IOCTL1_RESET
:
1783 return snd_pcm_lib_ioctl_reset(substream
, arg
);
1784 case SNDRV_PCM_IOCTL1_CHANNEL_INFO
:
1785 return snd_pcm_lib_ioctl_channel_info(substream
, arg
);
1786 case SNDRV_PCM_IOCTL1_FIFO_SIZE
:
1787 return snd_pcm_lib_ioctl_fifo_size(substream
, arg
);
1792 EXPORT_SYMBOL(snd_pcm_lib_ioctl
);
1795 * snd_pcm_period_elapsed - update the pcm status for the next period
1796 * @substream: the pcm substream instance
1798 * This function is called from the interrupt handler when the
1799 * PCM has processed the period size. It will update the current
1800 * pointer, wake up sleepers, etc.
1802 * Even if more than one periods have elapsed since the last call, you
1803 * have to call this only once.
1805 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
)
1807 struct snd_pcm_runtime
*runtime
;
1808 unsigned long flags
;
1810 if (PCM_RUNTIME_CHECK(substream
))
1812 runtime
= substream
->runtime
;
1814 if (runtime
->transfer_ack_begin
)
1815 runtime
->transfer_ack_begin(substream
);
1817 snd_pcm_stream_lock_irqsave(substream
, flags
);
1818 if (!snd_pcm_running(substream
) ||
1819 snd_pcm_update_hw_ptr0(substream
, 1) < 0)
1822 if (substream
->timer_running
)
1823 snd_timer_interrupt(substream
->timer
, 1);
1825 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1826 if (runtime
->transfer_ack_end
)
1827 runtime
->transfer_ack_end(substream
);
1828 kill_fasync(&runtime
->fasync
, SIGIO
, POLL_IN
);
1831 EXPORT_SYMBOL(snd_pcm_period_elapsed
);
1834 * Wait until avail_min data becomes available
1835 * Returns a negative error code if any error occurs during operation.
1836 * The available space is stored on availp. When err = 0 and avail = 0
1837 * on the capture stream, it indicates the stream is in DRAINING state.
1839 static int wait_for_avail(struct snd_pcm_substream
*substream
,
1840 snd_pcm_uframes_t
*availp
)
1842 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1843 int is_playback
= substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
;
1846 snd_pcm_uframes_t avail
= 0;
1847 long wait_time
, tout
;
1849 init_waitqueue_entry(&wait
, current
);
1850 set_current_state(TASK_INTERRUPTIBLE
);
1851 add_wait_queue(&runtime
->tsleep
, &wait
);
1853 if (runtime
->no_period_wakeup
)
1854 wait_time
= MAX_SCHEDULE_TIMEOUT
;
1857 if (runtime
->rate
) {
1858 long t
= runtime
->period_size
* 2 / runtime
->rate
;
1859 wait_time
= max(t
, wait_time
);
1861 wait_time
= msecs_to_jiffies(wait_time
* 1000);
1865 if (signal_pending(current
)) {
1871 * We need to check if space became available already
1872 * (and thus the wakeup happened already) first to close
1873 * the race of space already having become available.
1874 * This check must happen after been added to the waitqueue
1875 * and having current state be INTERRUPTIBLE.
1878 avail
= snd_pcm_playback_avail(runtime
);
1880 avail
= snd_pcm_capture_avail(runtime
);
1881 if (avail
>= runtime
->twake
)
1883 snd_pcm_stream_unlock_irq(substream
);
1885 tout
= schedule_timeout(wait_time
);
1887 snd_pcm_stream_lock_irq(substream
);
1888 set_current_state(TASK_INTERRUPTIBLE
);
1889 switch (runtime
->status
->state
) {
1890 case SNDRV_PCM_STATE_SUSPENDED
:
1893 case SNDRV_PCM_STATE_XRUN
:
1896 case SNDRV_PCM_STATE_DRAINING
:
1900 avail
= 0; /* indicate draining */
1902 case SNDRV_PCM_STATE_OPEN
:
1903 case SNDRV_PCM_STATE_SETUP
:
1904 case SNDRV_PCM_STATE_DISCONNECTED
:
1909 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1910 is_playback
? "playback" : "capture");
1916 set_current_state(TASK_RUNNING
);
1917 remove_wait_queue(&runtime
->tsleep
, &wait
);
1922 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream
*substream
,
1924 unsigned long data
, unsigned int off
,
1925 snd_pcm_uframes_t frames
)
1927 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1929 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1930 if (substream
->ops
->copy
) {
1931 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1934 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1935 if (copy_from_user(hwbuf
, buf
, frames_to_bytes(runtime
, frames
)))
1941 typedef int (*transfer_f
)(struct snd_pcm_substream
*substream
, unsigned int hwoff
,
1942 unsigned long data
, unsigned int off
,
1943 snd_pcm_uframes_t size
);
1945 static snd_pcm_sframes_t
snd_pcm_lib_write1(struct snd_pcm_substream
*substream
,
1947 snd_pcm_uframes_t size
,
1949 transfer_f transfer
)
1951 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1952 snd_pcm_uframes_t xfer
= 0;
1953 snd_pcm_uframes_t offset
= 0;
1954 snd_pcm_uframes_t avail
;
1960 snd_pcm_stream_lock_irq(substream
);
1961 switch (runtime
->status
->state
) {
1962 case SNDRV_PCM_STATE_PREPARED
:
1963 case SNDRV_PCM_STATE_RUNNING
:
1964 case SNDRV_PCM_STATE_PAUSED
:
1966 case SNDRV_PCM_STATE_XRUN
:
1969 case SNDRV_PCM_STATE_SUSPENDED
:
1977 runtime
->twake
= runtime
->control
->avail_min
? : 1;
1978 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1979 snd_pcm_update_hw_ptr(substream
);
1980 avail
= snd_pcm_playback_avail(runtime
);
1982 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1983 snd_pcm_uframes_t cont
;
1989 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
1990 runtime
->control
->avail_min
? : 1);
1991 err
= wait_for_avail(substream
, &avail
);
1995 frames
= size
> avail
? avail
: size
;
1996 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
1999 if (snd_BUG_ON(!frames
)) {
2001 snd_pcm_stream_unlock_irq(substream
);
2004 appl_ptr
= runtime
->control
->appl_ptr
;
2005 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2006 snd_pcm_stream_unlock_irq(substream
);
2007 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
2008 snd_pcm_stream_lock_irq(substream
);
2011 switch (runtime
->status
->state
) {
2012 case SNDRV_PCM_STATE_XRUN
:
2015 case SNDRV_PCM_STATE_SUSPENDED
:
2022 if (appl_ptr
>= runtime
->boundary
)
2023 appl_ptr
-= runtime
->boundary
;
2024 runtime
->control
->appl_ptr
= appl_ptr
;
2025 if (substream
->ops
->ack
)
2026 substream
->ops
->ack(substream
);
2032 if (runtime
->status
->state
== SNDRV_PCM_STATE_PREPARED
&&
2033 snd_pcm_playback_hw_avail(runtime
) >= (snd_pcm_sframes_t
)runtime
->start_threshold
) {
2034 err
= snd_pcm_start(substream
);
2041 if (xfer
> 0 && err
>= 0)
2042 snd_pcm_update_state(substream
, runtime
);
2043 snd_pcm_stream_unlock_irq(substream
);
2044 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2047 /* sanity-check for read/write methods */
2048 static int pcm_sanity_check(struct snd_pcm_substream
*substream
)
2050 struct snd_pcm_runtime
*runtime
;
2051 if (PCM_RUNTIME_CHECK(substream
))
2053 runtime
= substream
->runtime
;
2054 if (snd_BUG_ON(!substream
->ops
->copy
&& !runtime
->dma_area
))
2056 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2061 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
, const void __user
*buf
, snd_pcm_uframes_t size
)
2063 struct snd_pcm_runtime
*runtime
;
2067 err
= pcm_sanity_check(substream
);
2070 runtime
= substream
->runtime
;
2071 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2073 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
&&
2074 runtime
->channels
> 1)
2076 return snd_pcm_lib_write1(substream
, (unsigned long)buf
, size
, nonblock
,
2077 snd_pcm_lib_write_transfer
);
2080 EXPORT_SYMBOL(snd_pcm_lib_write
);
2082 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream
*substream
,
2084 unsigned long data
, unsigned int off
,
2085 snd_pcm_uframes_t frames
)
2087 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2089 void __user
**bufs
= (void __user
**)data
;
2090 int channels
= runtime
->channels
;
2092 if (substream
->ops
->copy
) {
2093 if (snd_BUG_ON(!substream
->ops
->silence
))
2095 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2096 if (*bufs
== NULL
) {
2097 if ((err
= substream
->ops
->silence(substream
, c
, hwoff
, frames
)) < 0)
2100 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2101 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2106 /* default transfer behaviour */
2107 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
2108 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2109 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2110 if (*bufs
== NULL
) {
2111 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, frames
);
2113 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2114 if (copy_from_user(hwbuf
, buf
, samples_to_bytes(runtime
, frames
)))
2122 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
2124 snd_pcm_uframes_t frames
)
2126 struct snd_pcm_runtime
*runtime
;
2130 err
= pcm_sanity_check(substream
);
2133 runtime
= substream
->runtime
;
2134 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2136 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2138 return snd_pcm_lib_write1(substream
, (unsigned long)bufs
, frames
,
2139 nonblock
, snd_pcm_lib_writev_transfer
);
2142 EXPORT_SYMBOL(snd_pcm_lib_writev
);
2144 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream
*substream
,
2146 unsigned long data
, unsigned int off
,
2147 snd_pcm_uframes_t frames
)
2149 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2151 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
2152 if (substream
->ops
->copy
) {
2153 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
2156 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
2157 if (copy_to_user(buf
, hwbuf
, frames_to_bytes(runtime
, frames
)))
2163 static snd_pcm_sframes_t
snd_pcm_lib_read1(struct snd_pcm_substream
*substream
,
2165 snd_pcm_uframes_t size
,
2167 transfer_f transfer
)
2169 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2170 snd_pcm_uframes_t xfer
= 0;
2171 snd_pcm_uframes_t offset
= 0;
2172 snd_pcm_uframes_t avail
;
2178 snd_pcm_stream_lock_irq(substream
);
2179 switch (runtime
->status
->state
) {
2180 case SNDRV_PCM_STATE_PREPARED
:
2181 if (size
>= runtime
->start_threshold
) {
2182 err
= snd_pcm_start(substream
);
2187 case SNDRV_PCM_STATE_DRAINING
:
2188 case SNDRV_PCM_STATE_RUNNING
:
2189 case SNDRV_PCM_STATE_PAUSED
:
2191 case SNDRV_PCM_STATE_XRUN
:
2194 case SNDRV_PCM_STATE_SUSPENDED
:
2202 runtime
->twake
= runtime
->control
->avail_min
? : 1;
2203 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
2204 snd_pcm_update_hw_ptr(substream
);
2205 avail
= snd_pcm_capture_avail(runtime
);
2207 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
2208 snd_pcm_uframes_t cont
;
2210 if (runtime
->status
->state
==
2211 SNDRV_PCM_STATE_DRAINING
) {
2212 snd_pcm_stop(substream
, SNDRV_PCM_STATE_SETUP
);
2219 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
2220 runtime
->control
->avail_min
? : 1);
2221 err
= wait_for_avail(substream
, &avail
);
2225 continue; /* draining */
2227 frames
= size
> avail
? avail
: size
;
2228 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
2231 if (snd_BUG_ON(!frames
)) {
2233 snd_pcm_stream_unlock_irq(substream
);
2236 appl_ptr
= runtime
->control
->appl_ptr
;
2237 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2238 snd_pcm_stream_unlock_irq(substream
);
2239 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
2240 snd_pcm_stream_lock_irq(substream
);
2243 switch (runtime
->status
->state
) {
2244 case SNDRV_PCM_STATE_XRUN
:
2247 case SNDRV_PCM_STATE_SUSPENDED
:
2254 if (appl_ptr
>= runtime
->boundary
)
2255 appl_ptr
-= runtime
->boundary
;
2256 runtime
->control
->appl_ptr
= appl_ptr
;
2257 if (substream
->ops
->ack
)
2258 substream
->ops
->ack(substream
);
2267 if (xfer
> 0 && err
>= 0)
2268 snd_pcm_update_state(substream
, runtime
);
2269 snd_pcm_stream_unlock_irq(substream
);
2270 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2273 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
, void __user
*buf
, snd_pcm_uframes_t size
)
2275 struct snd_pcm_runtime
*runtime
;
2279 err
= pcm_sanity_check(substream
);
2282 runtime
= substream
->runtime
;
2283 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2284 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
2286 return snd_pcm_lib_read1(substream
, (unsigned long)buf
, size
, nonblock
, snd_pcm_lib_read_transfer
);
2289 EXPORT_SYMBOL(snd_pcm_lib_read
);
2291 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream
*substream
,
2293 unsigned long data
, unsigned int off
,
2294 snd_pcm_uframes_t frames
)
2296 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2298 void __user
**bufs
= (void __user
**)data
;
2299 int channels
= runtime
->channels
;
2301 if (substream
->ops
->copy
) {
2302 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2306 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2307 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2311 snd_pcm_uframes_t dma_csize
= runtime
->dma_bytes
/ channels
;
2312 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2318 hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2319 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2320 if (copy_to_user(buf
, hwbuf
, samples_to_bytes(runtime
, frames
)))
2327 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
2329 snd_pcm_uframes_t frames
)
2331 struct snd_pcm_runtime
*runtime
;
2335 err
= pcm_sanity_check(substream
);
2338 runtime
= substream
->runtime
;
2339 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2342 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2343 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2345 return snd_pcm_lib_read1(substream
, (unsigned long)bufs
, frames
, nonblock
, snd_pcm_lib_readv_transfer
);
2348 EXPORT_SYMBOL(snd_pcm_lib_readv
);
2351 * standard channel mapping helpers
2354 /* default channel maps for multi-channel playbacks, up to 8 channels */
2355 const struct snd_pcm_chmap_elem snd_pcm_std_chmaps
[] = {
2357 .map
= { SNDRV_CHMAP_MONO
} },
2359 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
} },
2361 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2362 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2364 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2365 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2366 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
} },
2368 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2369 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2370 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2371 SNDRV_CHMAP_SL
, SNDRV_CHMAP_SR
} },
2374 EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps
);
2376 /* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2377 const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps
[] = {
2379 .map
= { SNDRV_CHMAP_MONO
} },
2381 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
} },
2383 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2384 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2386 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2387 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2388 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2390 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2391 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2392 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2393 SNDRV_CHMAP_SL
, SNDRV_CHMAP_SR
} },
2396 EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps
);
2398 static bool valid_chmap_channels(const struct snd_pcm_chmap
*info
, int ch
)
2400 if (ch
> info
->max_channels
)
2402 return !info
->channel_mask
|| (info
->channel_mask
& (1U << ch
));
2405 static int pcm_chmap_ctl_info(struct snd_kcontrol
*kcontrol
,
2406 struct snd_ctl_elem_info
*uinfo
)
2408 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2410 uinfo
->type
= SNDRV_CTL_ELEM_TYPE_INTEGER
;
2412 uinfo
->count
= info
->max_channels
;
2413 uinfo
->value
.integer
.min
= 0;
2414 uinfo
->value
.integer
.max
= SNDRV_CHMAP_LAST
;
2418 /* get callback for channel map ctl element
2419 * stores the channel position firstly matching with the current channels
2421 static int pcm_chmap_ctl_get(struct snd_kcontrol
*kcontrol
,
2422 struct snd_ctl_elem_value
*ucontrol
)
2424 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2425 unsigned int idx
= snd_ctl_get_ioffidx(kcontrol
, &ucontrol
->id
);
2426 struct snd_pcm_substream
*substream
;
2427 const struct snd_pcm_chmap_elem
*map
;
2429 if (snd_BUG_ON(!info
->chmap
))
2431 substream
= snd_pcm_chmap_substream(info
, idx
);
2434 memset(ucontrol
->value
.integer
.value
, 0,
2435 sizeof(ucontrol
->value
.integer
.value
));
2436 if (!substream
->runtime
)
2437 return 0; /* no channels set */
2438 for (map
= info
->chmap
; map
->channels
; map
++) {
2440 if (map
->channels
== substream
->runtime
->channels
&&
2441 valid_chmap_channels(info
, map
->channels
)) {
2442 for (i
= 0; i
< map
->channels
; i
++)
2443 ucontrol
->value
.integer
.value
[i
] = map
->map
[i
];
2450 /* tlv callback for channel map ctl element
2451 * expands the pre-defined channel maps in a form of TLV
2453 static int pcm_chmap_ctl_tlv(struct snd_kcontrol
*kcontrol
, int op_flag
,
2454 unsigned int size
, unsigned int __user
*tlv
)
2456 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2457 const struct snd_pcm_chmap_elem
*map
;
2458 unsigned int __user
*dst
;
2461 if (snd_BUG_ON(!info
->chmap
))
2465 if (put_user(SNDRV_CTL_TLVT_CONTAINER
, tlv
))
2469 for (map
= info
->chmap
; map
->channels
; map
++) {
2470 int chs_bytes
= map
->channels
* 4;
2471 if (!valid_chmap_channels(info
, map
->channels
))
2475 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED
, dst
) ||
2476 put_user(chs_bytes
, dst
+ 1))
2481 if (size
< chs_bytes
)
2485 for (c
= 0; c
< map
->channels
; c
++) {
2486 if (put_user(map
->map
[c
], dst
))
2491 if (put_user(count
, tlv
+ 1))
2496 static void pcm_chmap_ctl_private_free(struct snd_kcontrol
*kcontrol
)
2498 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2499 info
->pcm
->streams
[info
->stream
].chmap_kctl
= NULL
;
2504 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2505 * @pcm: the assigned PCM instance
2506 * @stream: stream direction
2507 * @chmap: channel map elements (for query)
2508 * @max_channels: the max number of channels for the stream
2509 * @private_value: the value passed to each kcontrol's private_value field
2510 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2512 * Create channel-mapping control elements assigned to the given PCM stream(s).
2513 * Returns zero if succeed, or a negative error value.
2515 int snd_pcm_add_chmap_ctls(struct snd_pcm
*pcm
, int stream
,
2516 const struct snd_pcm_chmap_elem
*chmap
,
2518 unsigned long private_value
,
2519 struct snd_pcm_chmap
**info_ret
)
2521 struct snd_pcm_chmap
*info
;
2522 struct snd_kcontrol_new knew
= {
2523 .iface
= SNDRV_CTL_ELEM_IFACE_PCM
,
2524 .access
= SNDRV_CTL_ELEM_ACCESS_READ
|
2525 SNDRV_CTL_ELEM_ACCESS_TLV_READ
|
2526 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK
,
2527 .info
= pcm_chmap_ctl_info
,
2528 .get
= pcm_chmap_ctl_get
,
2529 .tlv
.c
= pcm_chmap_ctl_tlv
,
2533 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
2537 info
->stream
= stream
;
2538 info
->chmap
= chmap
;
2539 info
->max_channels
= max_channels
;
2540 if (stream
== SNDRV_PCM_STREAM_PLAYBACK
)
2541 knew
.name
= "Playback Channel Map";
2543 knew
.name
= "Capture Channel Map";
2544 knew
.device
= pcm
->device
;
2545 knew
.count
= pcm
->streams
[stream
].substream_count
;
2546 knew
.private_value
= private_value
;
2547 info
->kctl
= snd_ctl_new1(&knew
, info
);
2552 info
->kctl
->private_free
= pcm_chmap_ctl_private_free
;
2553 err
= snd_ctl_add(pcm
->card
, info
->kctl
);
2556 pcm
->streams
[stream
].chmap_kctl
= info
->kctl
;
2561 EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls
);