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 pcm_warn(substream
->pcm
, "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 pr_err_ratelimited("ALSA: PCM: " fmt, ##args); \
188 dump_stack_on_xrun(substream); \
192 #define XRUN_LOG_CNT 10
194 struct hwptr_log_entry
{
195 unsigned int in_interrupt
;
196 unsigned long jiffies
;
197 snd_pcm_uframes_t pos
;
198 snd_pcm_uframes_t period_size
;
199 snd_pcm_uframes_t buffer_size
;
200 snd_pcm_uframes_t old_hw_ptr
;
201 snd_pcm_uframes_t hw_ptr_base
;
204 struct snd_pcm_hwptr_log
{
207 struct hwptr_log_entry entries
[XRUN_LOG_CNT
];
210 static void xrun_log(struct snd_pcm_substream
*substream
,
211 snd_pcm_uframes_t pos
, int in_interrupt
)
213 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
214 struct snd_pcm_hwptr_log
*log
= runtime
->hwptr_log
;
215 struct hwptr_log_entry
*entry
;
218 log
= kzalloc(sizeof(*log
), GFP_ATOMIC
);
221 runtime
->hwptr_log
= log
;
223 if (xrun_debug(substream
, XRUN_DEBUG_LOGONCE
) && log
->hit
)
226 entry
= &log
->entries
[log
->idx
];
227 entry
->in_interrupt
= in_interrupt
;
228 entry
->jiffies
= jiffies
;
230 entry
->period_size
= runtime
->period_size
;
231 entry
->buffer_size
= runtime
->buffer_size
;
232 entry
->old_hw_ptr
= runtime
->status
->hw_ptr
;
233 entry
->hw_ptr_base
= runtime
->hw_ptr_base
;
234 log
->idx
= (log
->idx
+ 1) % XRUN_LOG_CNT
;
237 static void xrun_log_show(struct snd_pcm_substream
*substream
)
239 struct snd_pcm_hwptr_log
*log
= substream
->runtime
->hwptr_log
;
240 struct hwptr_log_entry
*entry
;
247 if (xrun_debug(substream
, XRUN_DEBUG_LOGONCE
) && log
->hit
)
249 snd_pcm_debug_name(substream
, name
, sizeof(name
));
250 for (cnt
= 0, idx
= log
->idx
; cnt
< XRUN_LOG_CNT
; cnt
++) {
251 entry
= &log
->entries
[idx
];
252 if (entry
->period_size
== 0)
254 pr_info("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
256 name
, entry
->in_interrupt
? "[Q] " : "",
258 (unsigned long)entry
->pos
,
259 (unsigned long)entry
->period_size
,
260 (unsigned long)entry
->buffer_size
,
261 (unsigned long)entry
->old_hw_ptr
,
262 (unsigned long)entry
->hw_ptr_base
);
269 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
271 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
272 #define xrun_log(substream, pos, in_interrupt) do { } while (0)
273 #define xrun_log_show(substream) do { } while (0)
277 int snd_pcm_update_state(struct snd_pcm_substream
*substream
,
278 struct snd_pcm_runtime
*runtime
)
280 snd_pcm_uframes_t avail
;
282 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
283 avail
= snd_pcm_playback_avail(runtime
);
285 avail
= snd_pcm_capture_avail(runtime
);
286 if (avail
> runtime
->avail_max
)
287 runtime
->avail_max
= avail
;
288 if (runtime
->status
->state
== SNDRV_PCM_STATE_DRAINING
) {
289 if (avail
>= runtime
->buffer_size
) {
290 snd_pcm_drain_done(substream
);
294 if (avail
>= runtime
->stop_threshold
) {
299 if (runtime
->twake
) {
300 if (avail
>= runtime
->twake
)
301 wake_up(&runtime
->tsleep
);
302 } else if (avail
>= runtime
->control
->avail_min
)
303 wake_up(&runtime
->sleep
);
307 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream
*substream
,
308 unsigned int in_interrupt
)
310 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
311 snd_pcm_uframes_t pos
;
312 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
, hw_base
;
313 snd_pcm_sframes_t hdelta
, delta
;
314 unsigned long jdelta
;
315 unsigned long curr_jiffies
;
316 struct timespec curr_tstamp
;
317 struct timespec audio_tstamp
;
318 int crossed_boundary
= 0;
320 old_hw_ptr
= runtime
->status
->hw_ptr
;
323 * group pointer, time and jiffies reads to allow for more
324 * accurate correlations/corrections.
325 * The values are stored at the end of this routine after
326 * corrections for hw_ptr position
328 pos
= substream
->ops
->pointer(substream
);
329 curr_jiffies
= jiffies
;
330 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
) {
331 snd_pcm_gettime(runtime
, (struct timespec
*)&curr_tstamp
);
333 if ((runtime
->hw
.info
& SNDRV_PCM_INFO_HAS_WALL_CLOCK
) &&
334 (substream
->ops
->wall_clock
))
335 substream
->ops
->wall_clock(substream
, &audio_tstamp
);
338 if (pos
== SNDRV_PCM_POS_XRUN
) {
342 if (pos
>= runtime
->buffer_size
) {
343 if (printk_ratelimit()) {
345 snd_pcm_debug_name(substream
, name
, sizeof(name
));
346 xrun_log_show(substream
);
347 pcm_err(substream
->pcm
,
348 "BUG: %s, pos = %ld, buffer size = %ld, period size = %ld\n",
349 name
, pos
, runtime
->buffer_size
,
350 runtime
->period_size
);
354 pos
-= pos
% runtime
->min_align
;
355 if (xrun_debug(substream
, XRUN_DEBUG_LOG
))
356 xrun_log(substream
, pos
, in_interrupt
);
357 hw_base
= runtime
->hw_ptr_base
;
358 new_hw_ptr
= hw_base
+ pos
;
360 /* we know that one period was processed */
361 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
362 delta
= runtime
->hw_ptr_interrupt
+ runtime
->period_size
;
363 if (delta
> new_hw_ptr
) {
364 /* check for double acknowledged interrupts */
365 hdelta
= curr_jiffies
- runtime
->hw_ptr_jiffies
;
366 if (hdelta
> runtime
->hw_ptr_buffer_jiffies
/2) {
367 hw_base
+= runtime
->buffer_size
;
368 if (hw_base
>= runtime
->boundary
) {
372 new_hw_ptr
= hw_base
+ pos
;
377 /* new_hw_ptr might be lower than old_hw_ptr in case when */
378 /* pointer crosses the end of the ring buffer */
379 if (new_hw_ptr
< old_hw_ptr
) {
380 hw_base
+= runtime
->buffer_size
;
381 if (hw_base
>= runtime
->boundary
) {
385 new_hw_ptr
= hw_base
+ pos
;
388 delta
= new_hw_ptr
- old_hw_ptr
;
390 delta
+= runtime
->boundary
;
391 if (xrun_debug(substream
, in_interrupt
?
392 XRUN_DEBUG_PERIODUPDATE
: XRUN_DEBUG_HWPTRUPDATE
)) {
394 snd_pcm_debug_name(substream
, name
, sizeof(name
));
395 pcm_dbg(substream
->pcm
,
396 "%s_update: %s: pos=%u/%u/%u, hwptr=%ld/%ld/%ld/%ld\n",
397 in_interrupt
? "period" : "hwptr",
400 (unsigned int)runtime
->period_size
,
401 (unsigned int)runtime
->buffer_size
,
402 (unsigned long)delta
,
403 (unsigned long)old_hw_ptr
,
404 (unsigned long)new_hw_ptr
,
405 (unsigned long)runtime
->hw_ptr_base
);
408 if (runtime
->no_period_wakeup
) {
409 snd_pcm_sframes_t xrun_threshold
;
411 * Without regular period interrupts, we have to check
412 * the elapsed time to detect xruns.
414 jdelta
= curr_jiffies
- runtime
->hw_ptr_jiffies
;
415 if (jdelta
< runtime
->hw_ptr_buffer_jiffies
/ 2)
417 hdelta
= jdelta
- delta
* HZ
/ runtime
->rate
;
418 xrun_threshold
= runtime
->hw_ptr_buffer_jiffies
/ 2 + 1;
419 while (hdelta
> xrun_threshold
) {
420 delta
+= runtime
->buffer_size
;
421 hw_base
+= runtime
->buffer_size
;
422 if (hw_base
>= runtime
->boundary
) {
426 new_hw_ptr
= hw_base
+ pos
;
427 hdelta
-= runtime
->hw_ptr_buffer_jiffies
;
432 /* something must be really wrong */
433 if (delta
>= runtime
->buffer_size
+ runtime
->period_size
) {
434 hw_ptr_error(substream
,
435 "Unexpected hw_pointer value %s"
436 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
438 in_interrupt
? "[Q] " : "[P]",
439 substream
->stream
, (long)pos
,
440 (long)new_hw_ptr
, (long)old_hw_ptr
);
444 /* Do jiffies check only in xrun_debug mode */
445 if (!xrun_debug(substream
, XRUN_DEBUG_JIFFIESCHECK
))
446 goto no_jiffies_check
;
448 /* Skip the jiffies check for hardwares with BATCH flag.
449 * Such hardware usually just increases the position at each IRQ,
450 * thus it can't give any strange position.
452 if (runtime
->hw
.info
& SNDRV_PCM_INFO_BATCH
)
453 goto no_jiffies_check
;
455 if (hdelta
< runtime
->delay
)
456 goto no_jiffies_check
;
457 hdelta
-= runtime
->delay
;
458 jdelta
= curr_jiffies
- runtime
->hw_ptr_jiffies
;
459 if (((hdelta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
461 (((runtime
->period_size
* HZ
) / runtime
->rate
)
463 /* move new_hw_ptr according jiffies not pos variable */
464 new_hw_ptr
= old_hw_ptr
;
466 /* use loop to avoid checks for delta overflows */
467 /* the delta value is small or zero in most cases */
469 new_hw_ptr
+= runtime
->period_size
;
470 if (new_hw_ptr
>= runtime
->boundary
) {
471 new_hw_ptr
-= runtime
->boundary
;
476 /* align hw_base to buffer_size */
477 hw_ptr_error(substream
,
478 "hw_ptr skipping! %s"
479 "(pos=%ld, delta=%ld, period=%ld, "
480 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
481 in_interrupt
? "[Q] " : "",
482 (long)pos
, (long)hdelta
,
483 (long)runtime
->period_size
, jdelta
,
484 ((hdelta
* HZ
) / runtime
->rate
), hw_base
,
485 (unsigned long)old_hw_ptr
,
486 (unsigned long)new_hw_ptr
);
487 /* reset values to proper state */
489 hw_base
= new_hw_ptr
- (new_hw_ptr
% runtime
->buffer_size
);
492 if (delta
> runtime
->period_size
+ runtime
->period_size
/ 2) {
493 hw_ptr_error(substream
,
494 "Lost interrupts? %s"
495 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
497 in_interrupt
? "[Q] " : "",
498 substream
->stream
, (long)delta
,
504 if (runtime
->status
->hw_ptr
== new_hw_ptr
)
507 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
508 runtime
->silence_size
> 0)
509 snd_pcm_playback_silence(substream
, new_hw_ptr
);
512 delta
= new_hw_ptr
- runtime
->hw_ptr_interrupt
;
514 delta
+= runtime
->boundary
;
515 delta
-= (snd_pcm_uframes_t
)delta
% runtime
->period_size
;
516 runtime
->hw_ptr_interrupt
+= delta
;
517 if (runtime
->hw_ptr_interrupt
>= runtime
->boundary
)
518 runtime
->hw_ptr_interrupt
-= runtime
->boundary
;
520 runtime
->hw_ptr_base
= hw_base
;
521 runtime
->status
->hw_ptr
= new_hw_ptr
;
522 runtime
->hw_ptr_jiffies
= curr_jiffies
;
523 if (crossed_boundary
) {
524 snd_BUG_ON(crossed_boundary
!= 1);
525 runtime
->hw_ptr_wrap
+= runtime
->boundary
;
527 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
) {
528 runtime
->status
->tstamp
= curr_tstamp
;
530 if (!(runtime
->hw
.info
& SNDRV_PCM_INFO_HAS_WALL_CLOCK
)) {
532 * no wall clock available, provide audio timestamp
533 * derived from pointer position+delay
535 u64 audio_frames
, audio_nsecs
;
537 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
538 audio_frames
= runtime
->hw_ptr_wrap
539 + runtime
->status
->hw_ptr
542 audio_frames
= runtime
->hw_ptr_wrap
543 + runtime
->status
->hw_ptr
545 audio_nsecs
= div_u64(audio_frames
* 1000000000LL,
547 audio_tstamp
= ns_to_timespec(audio_nsecs
);
549 runtime
->status
->audio_tstamp
= audio_tstamp
;
552 return snd_pcm_update_state(substream
, runtime
);
555 /* CAUTION: call it with irq disabled */
556 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
)
558 return snd_pcm_update_hw_ptr0(substream
, 0);
562 * snd_pcm_set_ops - set the PCM operators
563 * @pcm: the pcm instance
564 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
565 * @ops: the operator table
567 * Sets the given PCM operators to the pcm instance.
569 void snd_pcm_set_ops(struct snd_pcm
*pcm
, int direction
,
570 const struct snd_pcm_ops
*ops
)
572 struct snd_pcm_str
*stream
= &pcm
->streams
[direction
];
573 struct snd_pcm_substream
*substream
;
575 for (substream
= stream
->substream
; substream
!= NULL
; substream
= substream
->next
)
576 substream
->ops
= ops
;
579 EXPORT_SYMBOL(snd_pcm_set_ops
);
582 * snd_pcm_sync - set the PCM sync id
583 * @substream: the pcm substream
585 * Sets the PCM sync identifier for the card.
587 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
)
589 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
591 runtime
->sync
.id32
[0] = substream
->pcm
->card
->number
;
592 runtime
->sync
.id32
[1] = -1;
593 runtime
->sync
.id32
[2] = -1;
594 runtime
->sync
.id32
[3] = -1;
597 EXPORT_SYMBOL(snd_pcm_set_sync
);
600 * Standard ioctl routine
603 static inline unsigned int div32(unsigned int a
, unsigned int b
,
614 static inline unsigned int div_down(unsigned int a
, unsigned int b
)
621 static inline unsigned int div_up(unsigned int a
, unsigned int b
)
633 static inline unsigned int mul(unsigned int a
, unsigned int b
)
637 if (div_down(UINT_MAX
, a
) < b
)
642 static inline unsigned int muldiv32(unsigned int a
, unsigned int b
,
643 unsigned int c
, unsigned int *r
)
645 u_int64_t n
= (u_int64_t
) a
* b
;
651 n
= div_u64_rem(n
, c
, r
);
660 * snd_interval_refine - refine the interval value of configurator
661 * @i: the interval value to refine
662 * @v: the interval value to refer to
664 * Refines the interval value with the reference value.
665 * The interval is changed to the range satisfying both intervals.
666 * The interval status (min, max, integer, etc.) are evaluated.
668 * Return: Positive if the value is changed, zero if it's not changed, or a
669 * negative error code.
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 * Return: Positive if the value is changed, zero if it's not changed, or a
869 * negative error code.
871 int snd_interval_ratnum(struct snd_interval
*i
,
872 unsigned int rats_count
, struct snd_ratnum
*rats
,
873 unsigned int *nump
, unsigned int *denp
)
875 unsigned int best_num
, best_den
;
878 struct snd_interval t
;
880 unsigned int result_num
, result_den
;
883 best_num
= best_den
= best_diff
= 0;
884 for (k
= 0; k
< rats_count
; ++k
) {
885 unsigned int num
= rats
[k
].num
;
887 unsigned int q
= i
->min
;
891 den
= div_up(num
, q
);
892 if (den
< rats
[k
].den_min
)
894 if (den
> rats
[k
].den_max
)
895 den
= rats
[k
].den_max
;
898 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
902 diff
= num
- q
* den
;
906 diff
* best_den
< best_diff
* den
) {
916 t
.min
= div_down(best_num
, best_den
);
917 t
.openmin
= !!(best_num
% best_den
);
919 result_num
= best_num
;
920 result_diff
= best_diff
;
921 result_den
= best_den
;
922 best_num
= best_den
= best_diff
= 0;
923 for (k
= 0; k
< rats_count
; ++k
) {
924 unsigned int num
= rats
[k
].num
;
926 unsigned int q
= i
->max
;
932 den
= div_down(num
, q
);
933 if (den
> rats
[k
].den_max
)
935 if (den
< rats
[k
].den_min
)
936 den
= rats
[k
].den_min
;
939 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
941 den
+= rats
[k
].den_step
- r
;
943 diff
= q
* den
- num
;
947 diff
* best_den
< best_diff
* den
) {
957 t
.max
= div_up(best_num
, best_den
);
958 t
.openmax
= !!(best_num
% best_den
);
960 err
= snd_interval_refine(i
, &t
);
964 if (snd_interval_single(i
)) {
965 if (best_diff
* result_den
< result_diff
* best_den
) {
966 result_num
= best_num
;
967 result_den
= best_den
;
977 EXPORT_SYMBOL(snd_interval_ratnum
);
980 * snd_interval_ratden - refine the interval value
981 * @i: interval to refine
982 * @rats_count: number of struct ratden
983 * @rats: struct ratden array
984 * @nump: pointer to store the resultant numerator
985 * @denp: pointer to store the resultant denominator
987 * Return: Positive if the value is changed, zero if it's not changed, or a
988 * negative error code.
990 static int snd_interval_ratden(struct snd_interval
*i
,
991 unsigned int rats_count
, struct snd_ratden
*rats
,
992 unsigned int *nump
, unsigned int *denp
)
994 unsigned int best_num
, best_diff
, best_den
;
996 struct snd_interval t
;
999 best_num
= best_den
= best_diff
= 0;
1000 for (k
= 0; k
< rats_count
; ++k
) {
1002 unsigned int den
= rats
[k
].den
;
1003 unsigned int q
= i
->min
;
1006 if (num
> rats
[k
].num_max
)
1008 if (num
< rats
[k
].num_min
)
1009 num
= rats
[k
].num_max
;
1012 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
1014 num
+= rats
[k
].num_step
- r
;
1016 diff
= num
- q
* den
;
1017 if (best_num
== 0 ||
1018 diff
* best_den
< best_diff
* den
) {
1024 if (best_den
== 0) {
1028 t
.min
= div_down(best_num
, best_den
);
1029 t
.openmin
= !!(best_num
% best_den
);
1031 best_num
= best_den
= best_diff
= 0;
1032 for (k
= 0; k
< rats_count
; ++k
) {
1034 unsigned int den
= rats
[k
].den
;
1035 unsigned int q
= i
->max
;
1038 if (num
< rats
[k
].num_min
)
1040 if (num
> rats
[k
].num_max
)
1041 num
= rats
[k
].num_max
;
1044 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
1048 diff
= q
* den
- num
;
1049 if (best_num
== 0 ||
1050 diff
* best_den
< best_diff
* den
) {
1056 if (best_den
== 0) {
1060 t
.max
= div_up(best_num
, best_den
);
1061 t
.openmax
= !!(best_num
% best_den
);
1063 err
= snd_interval_refine(i
, &t
);
1067 if (snd_interval_single(i
)) {
1077 * snd_interval_list - refine the interval value from the list
1078 * @i: the interval value to refine
1079 * @count: the number of elements in the list
1080 * @list: the value list
1081 * @mask: the bit-mask to evaluate
1083 * Refines the interval value from the list.
1084 * When mask is non-zero, only the elements corresponding to bit 1 are
1087 * Return: Positive if the value is changed, zero if it's not changed, or a
1088 * negative error code.
1090 int snd_interval_list(struct snd_interval
*i
, unsigned int count
,
1091 const unsigned int *list
, unsigned int mask
)
1094 struct snd_interval list_range
;
1100 snd_interval_any(&list_range
);
1101 list_range
.min
= UINT_MAX
;
1103 for (k
= 0; k
< count
; k
++) {
1104 if (mask
&& !(mask
& (1 << k
)))
1106 if (!snd_interval_test(i
, list
[k
]))
1108 list_range
.min
= min(list_range
.min
, list
[k
]);
1109 list_range
.max
= max(list_range
.max
, list
[k
]);
1111 return snd_interval_refine(i
, &list_range
);
1114 EXPORT_SYMBOL(snd_interval_list
);
1116 static int snd_interval_step(struct snd_interval
*i
, unsigned int min
, unsigned int step
)
1120 n
= (i
->min
- min
) % step
;
1121 if (n
!= 0 || i
->openmin
) {
1125 n
= (i
->max
- min
) % step
;
1126 if (n
!= 0 || i
->openmax
) {
1130 if (snd_interval_checkempty(i
)) {
1137 /* Info constraints helpers */
1140 * snd_pcm_hw_rule_add - add the hw-constraint rule
1141 * @runtime: the pcm runtime instance
1142 * @cond: condition bits
1143 * @var: the variable to evaluate
1144 * @func: the evaluation function
1145 * @private: the private data pointer passed to function
1146 * @dep: the dependent variables
1148 * Return: Zero if successful, or a negative error code on failure.
1150 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
, unsigned int cond
,
1152 snd_pcm_hw_rule_func_t func
, void *private,
1155 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1156 struct snd_pcm_hw_rule
*c
;
1159 va_start(args
, dep
);
1160 if (constrs
->rules_num
>= constrs
->rules_all
) {
1161 struct snd_pcm_hw_rule
*new;
1162 unsigned int new_rules
= constrs
->rules_all
+ 16;
1163 new = kcalloc(new_rules
, sizeof(*c
), GFP_KERNEL
);
1168 if (constrs
->rules
) {
1169 memcpy(new, constrs
->rules
,
1170 constrs
->rules_num
* sizeof(*c
));
1171 kfree(constrs
->rules
);
1173 constrs
->rules
= new;
1174 constrs
->rules_all
= new_rules
;
1176 c
= &constrs
->rules
[constrs
->rules_num
];
1180 c
->private = private;
1183 if (snd_BUG_ON(k
>= ARRAY_SIZE(c
->deps
))) {
1190 dep
= va_arg(args
, int);
1192 constrs
->rules_num
++;
1197 EXPORT_SYMBOL(snd_pcm_hw_rule_add
);
1200 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1201 * @runtime: PCM runtime instance
1202 * @var: hw_params variable to apply the mask
1203 * @mask: the bitmap mask
1205 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1207 * Return: Zero if successful, or a negative error code on failure.
1209 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1212 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1213 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1214 *maskp
->bits
&= mask
;
1215 memset(maskp
->bits
+ 1, 0, (SNDRV_MASK_MAX
-32) / 8); /* clear rest */
1216 if (*maskp
->bits
== 0)
1222 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1223 * @runtime: PCM runtime instance
1224 * @var: hw_params variable to apply the mask
1225 * @mask: the 64bit bitmap mask
1227 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1229 * Return: Zero if successful, or a negative error code on failure.
1231 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1234 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1235 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1236 maskp
->bits
[0] &= (u_int32_t
)mask
;
1237 maskp
->bits
[1] &= (u_int32_t
)(mask
>> 32);
1238 memset(maskp
->bits
+ 2, 0, (SNDRV_MASK_MAX
-64) / 8); /* clear rest */
1239 if (! maskp
->bits
[0] && ! maskp
->bits
[1])
1245 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1246 * @runtime: PCM runtime instance
1247 * @var: hw_params variable to apply the integer constraint
1249 * Apply the constraint of integer to an interval parameter.
1251 * Return: Positive if the value is changed, zero if it's not changed, or a
1252 * negative error code.
1254 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
)
1256 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1257 return snd_interval_setinteger(constrs_interval(constrs
, var
));
1260 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer
);
1263 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1264 * @runtime: PCM runtime instance
1265 * @var: hw_params variable to apply the range
1266 * @min: the minimal value
1267 * @max: the maximal value
1269 * Apply the min/max range constraint to an interval parameter.
1271 * Return: Positive if the value is changed, zero if it's not changed, or a
1272 * negative error code.
1274 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1275 unsigned int min
, unsigned int max
)
1277 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1278 struct snd_interval t
;
1281 t
.openmin
= t
.openmax
= 0;
1283 return snd_interval_refine(constrs_interval(constrs
, var
), &t
);
1286 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax
);
1288 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params
*params
,
1289 struct snd_pcm_hw_rule
*rule
)
1291 struct snd_pcm_hw_constraint_list
*list
= rule
->private;
1292 return snd_interval_list(hw_param_interval(params
, rule
->var
), list
->count
, list
->list
, list
->mask
);
1297 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1298 * @runtime: PCM runtime instance
1299 * @cond: condition bits
1300 * @var: hw_params variable to apply the list constraint
1303 * Apply the list of constraints to an interval parameter.
1305 * Return: Zero if successful, or a negative error code on failure.
1307 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
1309 snd_pcm_hw_param_t var
,
1310 const struct snd_pcm_hw_constraint_list
*l
)
1312 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1313 snd_pcm_hw_rule_list
, (void *)l
,
1317 EXPORT_SYMBOL(snd_pcm_hw_constraint_list
);
1319 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params
*params
,
1320 struct snd_pcm_hw_rule
*rule
)
1322 struct snd_pcm_hw_constraint_ratnums
*r
= rule
->private;
1323 unsigned int num
= 0, den
= 0;
1325 err
= snd_interval_ratnum(hw_param_interval(params
, rule
->var
),
1326 r
->nrats
, r
->rats
, &num
, &den
);
1327 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1328 params
->rate_num
= num
;
1329 params
->rate_den
= den
;
1335 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1336 * @runtime: PCM runtime instance
1337 * @cond: condition bits
1338 * @var: hw_params variable to apply the ratnums constraint
1339 * @r: struct snd_ratnums constriants
1341 * Return: Zero if successful, or a negative error code on failure.
1343 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
1345 snd_pcm_hw_param_t var
,
1346 struct snd_pcm_hw_constraint_ratnums
*r
)
1348 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1349 snd_pcm_hw_rule_ratnums
, r
,
1353 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums
);
1355 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params
*params
,
1356 struct snd_pcm_hw_rule
*rule
)
1358 struct snd_pcm_hw_constraint_ratdens
*r
= rule
->private;
1359 unsigned int num
= 0, den
= 0;
1360 int err
= snd_interval_ratden(hw_param_interval(params
, rule
->var
),
1361 r
->nrats
, r
->rats
, &num
, &den
);
1362 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1363 params
->rate_num
= num
;
1364 params
->rate_den
= den
;
1370 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1371 * @runtime: PCM runtime instance
1372 * @cond: condition bits
1373 * @var: hw_params variable to apply the ratdens constraint
1374 * @r: struct snd_ratdens constriants
1376 * Return: Zero if successful, or a negative error code on failure.
1378 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
1380 snd_pcm_hw_param_t var
,
1381 struct snd_pcm_hw_constraint_ratdens
*r
)
1383 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1384 snd_pcm_hw_rule_ratdens
, r
,
1388 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens
);
1390 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params
*params
,
1391 struct snd_pcm_hw_rule
*rule
)
1393 unsigned int l
= (unsigned long) rule
->private;
1394 int width
= l
& 0xffff;
1395 unsigned int msbits
= l
>> 16;
1396 struct snd_interval
*i
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_SAMPLE_BITS
);
1397 if (snd_interval_single(i
) && snd_interval_value(i
) == width
)
1398 params
->msbits
= msbits
;
1403 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1404 * @runtime: PCM runtime instance
1405 * @cond: condition bits
1406 * @width: sample bits width
1407 * @msbits: msbits width
1409 * Return: Zero if successful, or a negative error code on failure.
1411 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
1414 unsigned int msbits
)
1416 unsigned long l
= (msbits
<< 16) | width
;
1417 return snd_pcm_hw_rule_add(runtime
, cond
, -1,
1418 snd_pcm_hw_rule_msbits
,
1420 SNDRV_PCM_HW_PARAM_SAMPLE_BITS
, -1);
1423 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits
);
1425 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params
*params
,
1426 struct snd_pcm_hw_rule
*rule
)
1428 unsigned long step
= (unsigned long) rule
->private;
1429 return snd_interval_step(hw_param_interval(params
, rule
->var
), 0, step
);
1433 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1434 * @runtime: PCM runtime instance
1435 * @cond: condition bits
1436 * @var: hw_params variable to apply the step constraint
1439 * Return: Zero if successful, or a negative error code on failure.
1441 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
1443 snd_pcm_hw_param_t var
,
1446 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1447 snd_pcm_hw_rule_step
, (void *) step
,
1451 EXPORT_SYMBOL(snd_pcm_hw_constraint_step
);
1453 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params
*params
, struct snd_pcm_hw_rule
*rule
)
1455 static unsigned int pow2_sizes
[] = {
1456 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1457 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1458 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1459 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1461 return snd_interval_list(hw_param_interval(params
, rule
->var
),
1462 ARRAY_SIZE(pow2_sizes
), pow2_sizes
, 0);
1466 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1467 * @runtime: PCM runtime instance
1468 * @cond: condition bits
1469 * @var: hw_params variable to apply the power-of-2 constraint
1471 * Return: Zero if successful, or a negative error code on failure.
1473 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
1475 snd_pcm_hw_param_t var
)
1477 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1478 snd_pcm_hw_rule_pow2
, NULL
,
1482 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2
);
1484 static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params
*params
,
1485 struct snd_pcm_hw_rule
*rule
)
1487 unsigned int base_rate
= (unsigned int)(uintptr_t)rule
->private;
1488 struct snd_interval
*rate
;
1490 rate
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
1491 return snd_interval_list(rate
, 1, &base_rate
, 0);
1495 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1496 * @runtime: PCM runtime instance
1497 * @base_rate: the rate at which the hardware does not resample
1499 * Return: Zero if successful, or a negative error code on failure.
1501 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime
*runtime
,
1502 unsigned int base_rate
)
1504 return snd_pcm_hw_rule_add(runtime
, SNDRV_PCM_HW_PARAMS_NORESAMPLE
,
1505 SNDRV_PCM_HW_PARAM_RATE
,
1506 snd_pcm_hw_rule_noresample_func
,
1507 (void *)(uintptr_t)base_rate
,
1508 SNDRV_PCM_HW_PARAM_RATE
, -1);
1510 EXPORT_SYMBOL(snd_pcm_hw_rule_noresample
);
1512 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params
*params
,
1513 snd_pcm_hw_param_t var
)
1515 if (hw_is_mask(var
)) {
1516 snd_mask_any(hw_param_mask(params
, var
));
1517 params
->cmask
|= 1 << var
;
1518 params
->rmask
|= 1 << var
;
1521 if (hw_is_interval(var
)) {
1522 snd_interval_any(hw_param_interval(params
, var
));
1523 params
->cmask
|= 1 << var
;
1524 params
->rmask
|= 1 << var
;
1530 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
)
1533 memset(params
, 0, sizeof(*params
));
1534 for (k
= SNDRV_PCM_HW_PARAM_FIRST_MASK
; k
<= SNDRV_PCM_HW_PARAM_LAST_MASK
; k
++)
1535 _snd_pcm_hw_param_any(params
, k
);
1536 for (k
= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
; k
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
; k
++)
1537 _snd_pcm_hw_param_any(params
, k
);
1541 EXPORT_SYMBOL(_snd_pcm_hw_params_any
);
1544 * snd_pcm_hw_param_value - return @params field @var value
1545 * @params: the hw_params instance
1546 * @var: parameter to retrieve
1547 * @dir: pointer to the direction (-1,0,1) or %NULL
1549 * Return: The value for field @var if it's fixed in configuration space
1550 * defined by @params. -%EINVAL otherwise.
1552 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
1553 snd_pcm_hw_param_t var
, int *dir
)
1555 if (hw_is_mask(var
)) {
1556 const struct snd_mask
*mask
= hw_param_mask_c(params
, var
);
1557 if (!snd_mask_single(mask
))
1561 return snd_mask_value(mask
);
1563 if (hw_is_interval(var
)) {
1564 const struct snd_interval
*i
= hw_param_interval_c(params
, var
);
1565 if (!snd_interval_single(i
))
1569 return snd_interval_value(i
);
1574 EXPORT_SYMBOL(snd_pcm_hw_param_value
);
1576 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
,
1577 snd_pcm_hw_param_t var
)
1579 if (hw_is_mask(var
)) {
1580 snd_mask_none(hw_param_mask(params
, var
));
1581 params
->cmask
|= 1 << var
;
1582 params
->rmask
|= 1 << var
;
1583 } else if (hw_is_interval(var
)) {
1584 snd_interval_none(hw_param_interval(params
, var
));
1585 params
->cmask
|= 1 << var
;
1586 params
->rmask
|= 1 << var
;
1592 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty
);
1594 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params
*params
,
1595 snd_pcm_hw_param_t var
)
1598 if (hw_is_mask(var
))
1599 changed
= snd_mask_refine_first(hw_param_mask(params
, var
));
1600 else if (hw_is_interval(var
))
1601 changed
= snd_interval_refine_first(hw_param_interval(params
, var
));
1605 params
->cmask
|= 1 << var
;
1606 params
->rmask
|= 1 << var
;
1613 * snd_pcm_hw_param_first - refine config space and return minimum value
1614 * @pcm: PCM instance
1615 * @params: the hw_params instance
1616 * @var: parameter to retrieve
1617 * @dir: pointer to the direction (-1,0,1) or %NULL
1619 * Inside configuration space defined by @params remove from @var all
1620 * values > minimum. Reduce configuration space accordingly.
1622 * Return: The minimum, or a negative error code on failure.
1624 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
1625 struct snd_pcm_hw_params
*params
,
1626 snd_pcm_hw_param_t var
, int *dir
)
1628 int changed
= _snd_pcm_hw_param_first(params
, var
);
1631 if (params
->rmask
) {
1632 int err
= snd_pcm_hw_refine(pcm
, params
);
1633 if (snd_BUG_ON(err
< 0))
1636 return snd_pcm_hw_param_value(params
, var
, dir
);
1639 EXPORT_SYMBOL(snd_pcm_hw_param_first
);
1641 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params
*params
,
1642 snd_pcm_hw_param_t var
)
1645 if (hw_is_mask(var
))
1646 changed
= snd_mask_refine_last(hw_param_mask(params
, var
));
1647 else if (hw_is_interval(var
))
1648 changed
= snd_interval_refine_last(hw_param_interval(params
, var
));
1652 params
->cmask
|= 1 << var
;
1653 params
->rmask
|= 1 << var
;
1660 * snd_pcm_hw_param_last - refine config space and return maximum value
1661 * @pcm: PCM instance
1662 * @params: the hw_params instance
1663 * @var: parameter to retrieve
1664 * @dir: pointer to the direction (-1,0,1) or %NULL
1666 * Inside configuration space defined by @params remove from @var all
1667 * values < maximum. Reduce configuration space accordingly.
1669 * Return: The maximum, or a negative error code on failure.
1671 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
1672 struct snd_pcm_hw_params
*params
,
1673 snd_pcm_hw_param_t var
, int *dir
)
1675 int changed
= _snd_pcm_hw_param_last(params
, var
);
1678 if (params
->rmask
) {
1679 int err
= snd_pcm_hw_refine(pcm
, params
);
1680 if (snd_BUG_ON(err
< 0))
1683 return snd_pcm_hw_param_value(params
, var
, dir
);
1686 EXPORT_SYMBOL(snd_pcm_hw_param_last
);
1689 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1690 * @pcm: PCM instance
1691 * @params: the hw_params instance
1693 * Choose one configuration from configuration space defined by @params.
1694 * The configuration chosen is that obtained fixing in this order:
1695 * first access, first format, first subformat, min channels,
1696 * min rate, min period time, max buffer size, min tick time
1698 * Return: Zero if successful, or a negative error code on failure.
1700 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*pcm
,
1701 struct snd_pcm_hw_params
*params
)
1703 static int vars
[] = {
1704 SNDRV_PCM_HW_PARAM_ACCESS
,
1705 SNDRV_PCM_HW_PARAM_FORMAT
,
1706 SNDRV_PCM_HW_PARAM_SUBFORMAT
,
1707 SNDRV_PCM_HW_PARAM_CHANNELS
,
1708 SNDRV_PCM_HW_PARAM_RATE
,
1709 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1710 SNDRV_PCM_HW_PARAM_BUFFER_SIZE
,
1711 SNDRV_PCM_HW_PARAM_TICK_TIME
,
1716 for (v
= vars
; *v
!= -1; v
++) {
1717 if (*v
!= SNDRV_PCM_HW_PARAM_BUFFER_SIZE
)
1718 err
= snd_pcm_hw_param_first(pcm
, params
, *v
, NULL
);
1720 err
= snd_pcm_hw_param_last(pcm
, params
, *v
, NULL
);
1721 if (snd_BUG_ON(err
< 0))
1727 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream
*substream
,
1730 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1731 unsigned long flags
;
1732 snd_pcm_stream_lock_irqsave(substream
, flags
);
1733 if (snd_pcm_running(substream
) &&
1734 snd_pcm_update_hw_ptr(substream
) >= 0)
1735 runtime
->status
->hw_ptr
%= runtime
->buffer_size
;
1737 runtime
->status
->hw_ptr
= 0;
1738 runtime
->hw_ptr_wrap
= 0;
1740 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1744 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream
*substream
,
1747 struct snd_pcm_channel_info
*info
= arg
;
1748 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1750 if (!(runtime
->info
& SNDRV_PCM_INFO_MMAP
)) {
1754 width
= snd_pcm_format_physical_width(runtime
->format
);
1758 switch (runtime
->access
) {
1759 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
:
1760 case SNDRV_PCM_ACCESS_RW_INTERLEAVED
:
1761 info
->first
= info
->channel
* width
;
1762 info
->step
= runtime
->channels
* width
;
1764 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED
:
1765 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
:
1767 size_t size
= runtime
->dma_bytes
/ runtime
->channels
;
1768 info
->first
= info
->channel
* size
* 8;
1779 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream
*substream
,
1782 struct snd_pcm_hw_params
*params
= arg
;
1783 snd_pcm_format_t format
;
1784 int channels
, width
;
1786 params
->fifo_size
= substream
->runtime
->hw
.fifo_size
;
1787 if (!(substream
->runtime
->hw
.info
& SNDRV_PCM_INFO_FIFO_IN_FRAMES
)) {
1788 format
= params_format(params
);
1789 channels
= params_channels(params
);
1790 width
= snd_pcm_format_physical_width(format
);
1791 params
->fifo_size
/= width
* channels
;
1797 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1798 * @substream: the pcm substream instance
1799 * @cmd: ioctl command
1800 * @arg: ioctl argument
1802 * Processes the generic ioctl commands for PCM.
1803 * Can be passed as the ioctl callback for PCM ops.
1805 * Return: Zero if successful, or a negative error code on failure.
1807 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
1808 unsigned int cmd
, void *arg
)
1811 case SNDRV_PCM_IOCTL1_INFO
:
1813 case SNDRV_PCM_IOCTL1_RESET
:
1814 return snd_pcm_lib_ioctl_reset(substream
, arg
);
1815 case SNDRV_PCM_IOCTL1_CHANNEL_INFO
:
1816 return snd_pcm_lib_ioctl_channel_info(substream
, arg
);
1817 case SNDRV_PCM_IOCTL1_FIFO_SIZE
:
1818 return snd_pcm_lib_ioctl_fifo_size(substream
, arg
);
1823 EXPORT_SYMBOL(snd_pcm_lib_ioctl
);
1826 * snd_pcm_period_elapsed - update the pcm status for the next period
1827 * @substream: the pcm substream instance
1829 * This function is called from the interrupt handler when the
1830 * PCM has processed the period size. It will update the current
1831 * pointer, wake up sleepers, etc.
1833 * Even if more than one periods have elapsed since the last call, you
1834 * have to call this only once.
1836 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
)
1838 struct snd_pcm_runtime
*runtime
;
1839 unsigned long flags
;
1841 if (PCM_RUNTIME_CHECK(substream
))
1843 runtime
= substream
->runtime
;
1845 if (runtime
->transfer_ack_begin
)
1846 runtime
->transfer_ack_begin(substream
);
1848 snd_pcm_stream_lock_irqsave(substream
, flags
);
1849 if (!snd_pcm_running(substream
) ||
1850 snd_pcm_update_hw_ptr0(substream
, 1) < 0)
1853 if (substream
->timer_running
)
1854 snd_timer_interrupt(substream
->timer
, 1);
1856 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1857 if (runtime
->transfer_ack_end
)
1858 runtime
->transfer_ack_end(substream
);
1859 kill_fasync(&runtime
->fasync
, SIGIO
, POLL_IN
);
1862 EXPORT_SYMBOL(snd_pcm_period_elapsed
);
1865 * Wait until avail_min data becomes available
1866 * Returns a negative error code if any error occurs during operation.
1867 * The available space is stored on availp. When err = 0 and avail = 0
1868 * on the capture stream, it indicates the stream is in DRAINING state.
1870 static int wait_for_avail(struct snd_pcm_substream
*substream
,
1871 snd_pcm_uframes_t
*availp
)
1873 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1874 int is_playback
= substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
;
1877 snd_pcm_uframes_t avail
= 0;
1878 long wait_time
, tout
;
1880 init_waitqueue_entry(&wait
, current
);
1881 set_current_state(TASK_INTERRUPTIBLE
);
1882 add_wait_queue(&runtime
->tsleep
, &wait
);
1884 if (runtime
->no_period_wakeup
)
1885 wait_time
= MAX_SCHEDULE_TIMEOUT
;
1888 if (runtime
->rate
) {
1889 long t
= runtime
->period_size
* 2 / runtime
->rate
;
1890 wait_time
= max(t
, wait_time
);
1892 wait_time
= msecs_to_jiffies(wait_time
* 1000);
1896 if (signal_pending(current
)) {
1902 * We need to check if space became available already
1903 * (and thus the wakeup happened already) first to close
1904 * the race of space already having become available.
1905 * This check must happen after been added to the waitqueue
1906 * and having current state be INTERRUPTIBLE.
1909 avail
= snd_pcm_playback_avail(runtime
);
1911 avail
= snd_pcm_capture_avail(runtime
);
1912 if (avail
>= runtime
->twake
)
1914 snd_pcm_stream_unlock_irq(substream
);
1916 tout
= schedule_timeout(wait_time
);
1918 snd_pcm_stream_lock_irq(substream
);
1919 set_current_state(TASK_INTERRUPTIBLE
);
1920 switch (runtime
->status
->state
) {
1921 case SNDRV_PCM_STATE_SUSPENDED
:
1924 case SNDRV_PCM_STATE_XRUN
:
1927 case SNDRV_PCM_STATE_DRAINING
:
1931 avail
= 0; /* indicate draining */
1933 case SNDRV_PCM_STATE_OPEN
:
1934 case SNDRV_PCM_STATE_SETUP
:
1935 case SNDRV_PCM_STATE_DISCONNECTED
:
1938 case SNDRV_PCM_STATE_PAUSED
:
1942 pcm_dbg(substream
->pcm
,
1943 "%s write error (DMA or IRQ trouble?)\n",
1944 is_playback
? "playback" : "capture");
1950 set_current_state(TASK_RUNNING
);
1951 remove_wait_queue(&runtime
->tsleep
, &wait
);
1956 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream
*substream
,
1958 unsigned long data
, unsigned int off
,
1959 snd_pcm_uframes_t frames
)
1961 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1963 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1964 if (substream
->ops
->copy
) {
1965 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1968 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1969 if (copy_from_user(hwbuf
, buf
, frames_to_bytes(runtime
, frames
)))
1975 typedef int (*transfer_f
)(struct snd_pcm_substream
*substream
, unsigned int hwoff
,
1976 unsigned long data
, unsigned int off
,
1977 snd_pcm_uframes_t size
);
1979 static snd_pcm_sframes_t
snd_pcm_lib_write1(struct snd_pcm_substream
*substream
,
1981 snd_pcm_uframes_t size
,
1983 transfer_f transfer
)
1985 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1986 snd_pcm_uframes_t xfer
= 0;
1987 snd_pcm_uframes_t offset
= 0;
1988 snd_pcm_uframes_t avail
;
1994 snd_pcm_stream_lock_irq(substream
);
1995 switch (runtime
->status
->state
) {
1996 case SNDRV_PCM_STATE_PREPARED
:
1997 case SNDRV_PCM_STATE_RUNNING
:
1998 case SNDRV_PCM_STATE_PAUSED
:
2000 case SNDRV_PCM_STATE_XRUN
:
2003 case SNDRV_PCM_STATE_SUSPENDED
:
2011 runtime
->twake
= runtime
->control
->avail_min
? : 1;
2012 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
2013 snd_pcm_update_hw_ptr(substream
);
2014 avail
= snd_pcm_playback_avail(runtime
);
2016 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
2017 snd_pcm_uframes_t cont
;
2023 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
2024 runtime
->control
->avail_min
? : 1);
2025 err
= wait_for_avail(substream
, &avail
);
2029 frames
= size
> avail
? avail
: size
;
2030 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
2033 if (snd_BUG_ON(!frames
)) {
2035 snd_pcm_stream_unlock_irq(substream
);
2038 appl_ptr
= runtime
->control
->appl_ptr
;
2039 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2040 snd_pcm_stream_unlock_irq(substream
);
2041 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
2042 snd_pcm_stream_lock_irq(substream
);
2045 switch (runtime
->status
->state
) {
2046 case SNDRV_PCM_STATE_XRUN
:
2049 case SNDRV_PCM_STATE_SUSPENDED
:
2056 if (appl_ptr
>= runtime
->boundary
)
2057 appl_ptr
-= runtime
->boundary
;
2058 runtime
->control
->appl_ptr
= appl_ptr
;
2059 if (substream
->ops
->ack
)
2060 substream
->ops
->ack(substream
);
2066 if (runtime
->status
->state
== SNDRV_PCM_STATE_PREPARED
&&
2067 snd_pcm_playback_hw_avail(runtime
) >= (snd_pcm_sframes_t
)runtime
->start_threshold
) {
2068 err
= snd_pcm_start(substream
);
2075 if (xfer
> 0 && err
>= 0)
2076 snd_pcm_update_state(substream
, runtime
);
2077 snd_pcm_stream_unlock_irq(substream
);
2078 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2081 /* sanity-check for read/write methods */
2082 static int pcm_sanity_check(struct snd_pcm_substream
*substream
)
2084 struct snd_pcm_runtime
*runtime
;
2085 if (PCM_RUNTIME_CHECK(substream
))
2087 runtime
= substream
->runtime
;
2088 if (snd_BUG_ON(!substream
->ops
->copy
&& !runtime
->dma_area
))
2090 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2095 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
, const void __user
*buf
, snd_pcm_uframes_t size
)
2097 struct snd_pcm_runtime
*runtime
;
2101 err
= pcm_sanity_check(substream
);
2104 runtime
= substream
->runtime
;
2105 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2107 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
&&
2108 runtime
->channels
> 1)
2110 return snd_pcm_lib_write1(substream
, (unsigned long)buf
, size
, nonblock
,
2111 snd_pcm_lib_write_transfer
);
2114 EXPORT_SYMBOL(snd_pcm_lib_write
);
2116 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream
*substream
,
2118 unsigned long data
, unsigned int off
,
2119 snd_pcm_uframes_t frames
)
2121 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2123 void __user
**bufs
= (void __user
**)data
;
2124 int channels
= runtime
->channels
;
2126 if (substream
->ops
->copy
) {
2127 if (snd_BUG_ON(!substream
->ops
->silence
))
2129 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2130 if (*bufs
== NULL
) {
2131 if ((err
= substream
->ops
->silence(substream
, c
, hwoff
, frames
)) < 0)
2134 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2135 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2140 /* default transfer behaviour */
2141 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
2142 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2143 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2144 if (*bufs
== NULL
) {
2145 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, frames
);
2147 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2148 if (copy_from_user(hwbuf
, buf
, samples_to_bytes(runtime
, frames
)))
2156 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
2158 snd_pcm_uframes_t frames
)
2160 struct snd_pcm_runtime
*runtime
;
2164 err
= pcm_sanity_check(substream
);
2167 runtime
= substream
->runtime
;
2168 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2170 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2172 return snd_pcm_lib_write1(substream
, (unsigned long)bufs
, frames
,
2173 nonblock
, snd_pcm_lib_writev_transfer
);
2176 EXPORT_SYMBOL(snd_pcm_lib_writev
);
2178 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream
*substream
,
2180 unsigned long data
, unsigned int off
,
2181 snd_pcm_uframes_t frames
)
2183 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2185 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
2186 if (substream
->ops
->copy
) {
2187 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
2190 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
2191 if (copy_to_user(buf
, hwbuf
, frames_to_bytes(runtime
, frames
)))
2197 static snd_pcm_sframes_t
snd_pcm_lib_read1(struct snd_pcm_substream
*substream
,
2199 snd_pcm_uframes_t size
,
2201 transfer_f transfer
)
2203 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2204 snd_pcm_uframes_t xfer
= 0;
2205 snd_pcm_uframes_t offset
= 0;
2206 snd_pcm_uframes_t avail
;
2212 snd_pcm_stream_lock_irq(substream
);
2213 switch (runtime
->status
->state
) {
2214 case SNDRV_PCM_STATE_PREPARED
:
2215 if (size
>= runtime
->start_threshold
) {
2216 err
= snd_pcm_start(substream
);
2221 case SNDRV_PCM_STATE_DRAINING
:
2222 case SNDRV_PCM_STATE_RUNNING
:
2223 case SNDRV_PCM_STATE_PAUSED
:
2225 case SNDRV_PCM_STATE_XRUN
:
2228 case SNDRV_PCM_STATE_SUSPENDED
:
2236 runtime
->twake
= runtime
->control
->avail_min
? : 1;
2237 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
2238 snd_pcm_update_hw_ptr(substream
);
2239 avail
= snd_pcm_capture_avail(runtime
);
2241 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
2242 snd_pcm_uframes_t cont
;
2244 if (runtime
->status
->state
==
2245 SNDRV_PCM_STATE_DRAINING
) {
2246 snd_pcm_stop(substream
, SNDRV_PCM_STATE_SETUP
);
2253 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
2254 runtime
->control
->avail_min
? : 1);
2255 err
= wait_for_avail(substream
, &avail
);
2259 continue; /* draining */
2261 frames
= size
> avail
? avail
: size
;
2262 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
2265 if (snd_BUG_ON(!frames
)) {
2267 snd_pcm_stream_unlock_irq(substream
);
2270 appl_ptr
= runtime
->control
->appl_ptr
;
2271 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2272 snd_pcm_stream_unlock_irq(substream
);
2273 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
2274 snd_pcm_stream_lock_irq(substream
);
2277 switch (runtime
->status
->state
) {
2278 case SNDRV_PCM_STATE_XRUN
:
2281 case SNDRV_PCM_STATE_SUSPENDED
:
2288 if (appl_ptr
>= runtime
->boundary
)
2289 appl_ptr
-= runtime
->boundary
;
2290 runtime
->control
->appl_ptr
= appl_ptr
;
2291 if (substream
->ops
->ack
)
2292 substream
->ops
->ack(substream
);
2301 if (xfer
> 0 && err
>= 0)
2302 snd_pcm_update_state(substream
, runtime
);
2303 snd_pcm_stream_unlock_irq(substream
);
2304 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2307 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
, void __user
*buf
, snd_pcm_uframes_t size
)
2309 struct snd_pcm_runtime
*runtime
;
2313 err
= pcm_sanity_check(substream
);
2316 runtime
= substream
->runtime
;
2317 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2318 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
2320 return snd_pcm_lib_read1(substream
, (unsigned long)buf
, size
, nonblock
, snd_pcm_lib_read_transfer
);
2323 EXPORT_SYMBOL(snd_pcm_lib_read
);
2325 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream
*substream
,
2327 unsigned long data
, unsigned int off
,
2328 snd_pcm_uframes_t frames
)
2330 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2332 void __user
**bufs
= (void __user
**)data
;
2333 int channels
= runtime
->channels
;
2335 if (substream
->ops
->copy
) {
2336 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2340 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2341 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2345 snd_pcm_uframes_t dma_csize
= runtime
->dma_bytes
/ channels
;
2346 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2352 hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2353 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2354 if (copy_to_user(buf
, hwbuf
, samples_to_bytes(runtime
, frames
)))
2361 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
2363 snd_pcm_uframes_t frames
)
2365 struct snd_pcm_runtime
*runtime
;
2369 err
= pcm_sanity_check(substream
);
2372 runtime
= substream
->runtime
;
2373 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2376 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2377 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2379 return snd_pcm_lib_read1(substream
, (unsigned long)bufs
, frames
, nonblock
, snd_pcm_lib_readv_transfer
);
2382 EXPORT_SYMBOL(snd_pcm_lib_readv
);
2385 * standard channel mapping helpers
2388 /* default channel maps for multi-channel playbacks, up to 8 channels */
2389 const struct snd_pcm_chmap_elem snd_pcm_std_chmaps
[] = {
2391 .map
= { SNDRV_CHMAP_MONO
} },
2393 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
} },
2395 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2396 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2398 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2399 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2400 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
} },
2402 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2403 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2404 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2405 SNDRV_CHMAP_SL
, SNDRV_CHMAP_SR
} },
2408 EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps
);
2410 /* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2411 const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps
[] = {
2413 .map
= { SNDRV_CHMAP_MONO
} },
2415 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
} },
2417 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2418 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2420 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2421 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2422 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2424 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2425 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2426 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2427 SNDRV_CHMAP_SL
, SNDRV_CHMAP_SR
} },
2430 EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps
);
2432 static bool valid_chmap_channels(const struct snd_pcm_chmap
*info
, int ch
)
2434 if (ch
> info
->max_channels
)
2436 return !info
->channel_mask
|| (info
->channel_mask
& (1U << ch
));
2439 static int pcm_chmap_ctl_info(struct snd_kcontrol
*kcontrol
,
2440 struct snd_ctl_elem_info
*uinfo
)
2442 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2444 uinfo
->type
= SNDRV_CTL_ELEM_TYPE_INTEGER
;
2446 uinfo
->count
= info
->max_channels
;
2447 uinfo
->value
.integer
.min
= 0;
2448 uinfo
->value
.integer
.max
= SNDRV_CHMAP_LAST
;
2452 /* get callback for channel map ctl element
2453 * stores the channel position firstly matching with the current channels
2455 static int pcm_chmap_ctl_get(struct snd_kcontrol
*kcontrol
,
2456 struct snd_ctl_elem_value
*ucontrol
)
2458 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2459 unsigned int idx
= snd_ctl_get_ioffidx(kcontrol
, &ucontrol
->id
);
2460 struct snd_pcm_substream
*substream
;
2461 const struct snd_pcm_chmap_elem
*map
;
2463 if (snd_BUG_ON(!info
->chmap
))
2465 substream
= snd_pcm_chmap_substream(info
, idx
);
2468 memset(ucontrol
->value
.integer
.value
, 0,
2469 sizeof(ucontrol
->value
.integer
.value
));
2470 if (!substream
->runtime
)
2471 return 0; /* no channels set */
2472 for (map
= info
->chmap
; map
->channels
; map
++) {
2474 if (map
->channels
== substream
->runtime
->channels
&&
2475 valid_chmap_channels(info
, map
->channels
)) {
2476 for (i
= 0; i
< map
->channels
; i
++)
2477 ucontrol
->value
.integer
.value
[i
] = map
->map
[i
];
2484 /* tlv callback for channel map ctl element
2485 * expands the pre-defined channel maps in a form of TLV
2487 static int pcm_chmap_ctl_tlv(struct snd_kcontrol
*kcontrol
, int op_flag
,
2488 unsigned int size
, unsigned int __user
*tlv
)
2490 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2491 const struct snd_pcm_chmap_elem
*map
;
2492 unsigned int __user
*dst
;
2495 if (snd_BUG_ON(!info
->chmap
))
2499 if (put_user(SNDRV_CTL_TLVT_CONTAINER
, tlv
))
2503 for (map
= info
->chmap
; map
->channels
; map
++) {
2504 int chs_bytes
= map
->channels
* 4;
2505 if (!valid_chmap_channels(info
, map
->channels
))
2509 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED
, dst
) ||
2510 put_user(chs_bytes
, dst
+ 1))
2515 if (size
< chs_bytes
)
2519 for (c
= 0; c
< map
->channels
; c
++) {
2520 if (put_user(map
->map
[c
], dst
))
2525 if (put_user(count
, tlv
+ 1))
2530 static void pcm_chmap_ctl_private_free(struct snd_kcontrol
*kcontrol
)
2532 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2533 info
->pcm
->streams
[info
->stream
].chmap_kctl
= NULL
;
2538 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2539 * @pcm: the assigned PCM instance
2540 * @stream: stream direction
2541 * @chmap: channel map elements (for query)
2542 * @max_channels: the max number of channels for the stream
2543 * @private_value: the value passed to each kcontrol's private_value field
2544 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2546 * Create channel-mapping control elements assigned to the given PCM stream(s).
2547 * Return: Zero if successful, or a negative error value.
2549 int snd_pcm_add_chmap_ctls(struct snd_pcm
*pcm
, int stream
,
2550 const struct snd_pcm_chmap_elem
*chmap
,
2552 unsigned long private_value
,
2553 struct snd_pcm_chmap
**info_ret
)
2555 struct snd_pcm_chmap
*info
;
2556 struct snd_kcontrol_new knew
= {
2557 .iface
= SNDRV_CTL_ELEM_IFACE_PCM
,
2558 .access
= SNDRV_CTL_ELEM_ACCESS_READ
|
2559 SNDRV_CTL_ELEM_ACCESS_TLV_READ
|
2560 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK
,
2561 .info
= pcm_chmap_ctl_info
,
2562 .get
= pcm_chmap_ctl_get
,
2563 .tlv
.c
= pcm_chmap_ctl_tlv
,
2567 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
2571 info
->stream
= stream
;
2572 info
->chmap
= chmap
;
2573 info
->max_channels
= max_channels
;
2574 if (stream
== SNDRV_PCM_STREAM_PLAYBACK
)
2575 knew
.name
= "Playback Channel Map";
2577 knew
.name
= "Capture Channel Map";
2578 knew
.device
= pcm
->device
;
2579 knew
.count
= pcm
->streams
[stream
].substream_count
;
2580 knew
.private_value
= private_value
;
2581 info
->kctl
= snd_ctl_new1(&knew
, info
);
2586 info
->kctl
->private_free
= pcm_chmap_ctl_private_free
;
2587 err
= snd_ctl_add(pcm
->card
, info
->kctl
);
2590 pcm
->streams
[stream
].chmap_kctl
= info
->kctl
;
2595 EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls
);