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
;
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 (pos
== SNDRV_PCM_POS_XRUN
) {
337 if (pos
>= runtime
->buffer_size
) {
338 if (printk_ratelimit()) {
340 snd_pcm_debug_name(substream
, name
, sizeof(name
));
341 xrun_log_show(substream
);
342 snd_printd(KERN_ERR
"BUG: %s, pos = %ld, "
343 "buffer size = %ld, period size = %ld\n",
344 name
, pos
, runtime
->buffer_size
,
345 runtime
->period_size
);
349 pos
-= pos
% runtime
->min_align
;
350 if (xrun_debug(substream
, XRUN_DEBUG_LOG
))
351 xrun_log(substream
, pos
, in_interrupt
);
352 hw_base
= runtime
->hw_ptr_base
;
353 new_hw_ptr
= hw_base
+ pos
;
355 /* we know that one period was processed */
356 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
357 delta
= runtime
->hw_ptr_interrupt
+ runtime
->period_size
;
358 if (delta
> new_hw_ptr
) {
359 /* check for double acknowledged interrupts */
360 hdelta
= curr_jiffies
- runtime
->hw_ptr_jiffies
;
361 if (hdelta
> runtime
->hw_ptr_buffer_jiffies
/2) {
362 hw_base
+= runtime
->buffer_size
;
363 if (hw_base
>= runtime
->boundary
)
365 new_hw_ptr
= hw_base
+ pos
;
370 /* new_hw_ptr might be lower than old_hw_ptr in case when */
371 /* pointer crosses the end of the ring buffer */
372 if (new_hw_ptr
< old_hw_ptr
) {
373 hw_base
+= runtime
->buffer_size
;
374 if (hw_base
>= runtime
->boundary
)
376 new_hw_ptr
= hw_base
+ pos
;
379 delta
= new_hw_ptr
- old_hw_ptr
;
381 delta
+= runtime
->boundary
;
382 if (xrun_debug(substream
, in_interrupt
?
383 XRUN_DEBUG_PERIODUPDATE
: XRUN_DEBUG_HWPTRUPDATE
)) {
385 snd_pcm_debug_name(substream
, name
, sizeof(name
));
386 snd_printd("%s_update: %s: pos=%u/%u/%u, "
387 "hwptr=%ld/%ld/%ld/%ld\n",
388 in_interrupt
? "period" : "hwptr",
391 (unsigned int)runtime
->period_size
,
392 (unsigned int)runtime
->buffer_size
,
393 (unsigned long)delta
,
394 (unsigned long)old_hw_ptr
,
395 (unsigned long)new_hw_ptr
,
396 (unsigned long)runtime
->hw_ptr_base
);
399 if (runtime
->no_period_wakeup
) {
400 snd_pcm_sframes_t xrun_threshold
;
402 * Without regular period interrupts, we have to check
403 * the elapsed time to detect xruns.
405 jdelta
= curr_jiffies
- runtime
->hw_ptr_jiffies
;
406 if (jdelta
< runtime
->hw_ptr_buffer_jiffies
/ 2)
408 hdelta
= jdelta
- delta
* HZ
/ runtime
->rate
;
409 xrun_threshold
= runtime
->hw_ptr_buffer_jiffies
/ 2 + 1;
410 while (hdelta
> xrun_threshold
) {
411 delta
+= runtime
->buffer_size
;
412 hw_base
+= runtime
->buffer_size
;
413 if (hw_base
>= runtime
->boundary
)
415 new_hw_ptr
= hw_base
+ pos
;
416 hdelta
-= runtime
->hw_ptr_buffer_jiffies
;
421 /* something must be really wrong */
422 if (delta
>= runtime
->buffer_size
+ runtime
->period_size
) {
423 hw_ptr_error(substream
,
424 "Unexpected hw_pointer value %s"
425 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
427 in_interrupt
? "[Q] " : "[P]",
428 substream
->stream
, (long)pos
,
429 (long)new_hw_ptr
, (long)old_hw_ptr
);
433 /* Do jiffies check only in xrun_debug mode */
434 if (!xrun_debug(substream
, XRUN_DEBUG_JIFFIESCHECK
))
435 goto no_jiffies_check
;
437 /* Skip the jiffies check for hardwares with BATCH flag.
438 * Such hardware usually just increases the position at each IRQ,
439 * thus it can't give any strange position.
441 if (runtime
->hw
.info
& SNDRV_PCM_INFO_BATCH
)
442 goto no_jiffies_check
;
444 if (hdelta
< runtime
->delay
)
445 goto no_jiffies_check
;
446 hdelta
-= runtime
->delay
;
447 jdelta
= curr_jiffies
- runtime
->hw_ptr_jiffies
;
448 if (((hdelta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
450 (((runtime
->period_size
* HZ
) / runtime
->rate
)
452 /* move new_hw_ptr according jiffies not pos variable */
453 new_hw_ptr
= old_hw_ptr
;
455 /* use loop to avoid checks for delta overflows */
456 /* the delta value is small or zero in most cases */
458 new_hw_ptr
+= runtime
->period_size
;
459 if (new_hw_ptr
>= runtime
->boundary
)
460 new_hw_ptr
-= runtime
->boundary
;
463 /* align hw_base to buffer_size */
464 hw_ptr_error(substream
,
465 "hw_ptr skipping! %s"
466 "(pos=%ld, delta=%ld, period=%ld, "
467 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
468 in_interrupt
? "[Q] " : "",
469 (long)pos
, (long)hdelta
,
470 (long)runtime
->period_size
, jdelta
,
471 ((hdelta
* HZ
) / runtime
->rate
), hw_base
,
472 (unsigned long)old_hw_ptr
,
473 (unsigned long)new_hw_ptr
);
474 /* reset values to proper state */
476 hw_base
= new_hw_ptr
- (new_hw_ptr
% runtime
->buffer_size
);
479 if (delta
> runtime
->period_size
+ runtime
->period_size
/ 2) {
480 hw_ptr_error(substream
,
481 "Lost interrupts? %s"
482 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
484 in_interrupt
? "[Q] " : "",
485 substream
->stream
, (long)delta
,
491 if (runtime
->status
->hw_ptr
== new_hw_ptr
)
494 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
495 runtime
->silence_size
> 0)
496 snd_pcm_playback_silence(substream
, new_hw_ptr
);
499 delta
= new_hw_ptr
- runtime
->hw_ptr_interrupt
;
501 delta
+= runtime
->boundary
;
502 delta
-= (snd_pcm_uframes_t
)delta
% runtime
->period_size
;
503 runtime
->hw_ptr_interrupt
+= delta
;
504 if (runtime
->hw_ptr_interrupt
>= runtime
->boundary
)
505 runtime
->hw_ptr_interrupt
-= runtime
->boundary
;
507 runtime
->hw_ptr_base
= hw_base
;
508 runtime
->status
->hw_ptr
= new_hw_ptr
;
509 runtime
->hw_ptr_jiffies
= curr_jiffies
;
510 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
511 runtime
->status
->tstamp
= curr_tstamp
;
513 return snd_pcm_update_state(substream
, runtime
);
516 /* CAUTION: call it with irq disabled */
517 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
)
519 return snd_pcm_update_hw_ptr0(substream
, 0);
523 * snd_pcm_set_ops - set the PCM operators
524 * @pcm: the pcm instance
525 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
526 * @ops: the operator table
528 * Sets the given PCM operators to the pcm instance.
530 void snd_pcm_set_ops(struct snd_pcm
*pcm
, int direction
, struct snd_pcm_ops
*ops
)
532 struct snd_pcm_str
*stream
= &pcm
->streams
[direction
];
533 struct snd_pcm_substream
*substream
;
535 for (substream
= stream
->substream
; substream
!= NULL
; substream
= substream
->next
)
536 substream
->ops
= ops
;
539 EXPORT_SYMBOL(snd_pcm_set_ops
);
542 * snd_pcm_sync - set the PCM sync id
543 * @substream: the pcm substream
545 * Sets the PCM sync identifier for the card.
547 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
)
549 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
551 runtime
->sync
.id32
[0] = substream
->pcm
->card
->number
;
552 runtime
->sync
.id32
[1] = -1;
553 runtime
->sync
.id32
[2] = -1;
554 runtime
->sync
.id32
[3] = -1;
557 EXPORT_SYMBOL(snd_pcm_set_sync
);
560 * Standard ioctl routine
563 static inline unsigned int div32(unsigned int a
, unsigned int b
,
574 static inline unsigned int div_down(unsigned int a
, unsigned int b
)
581 static inline unsigned int div_up(unsigned int a
, unsigned int b
)
593 static inline unsigned int mul(unsigned int a
, unsigned int b
)
597 if (div_down(UINT_MAX
, a
) < b
)
602 static inline unsigned int muldiv32(unsigned int a
, unsigned int b
,
603 unsigned int c
, unsigned int *r
)
605 u_int64_t n
= (u_int64_t
) a
* b
;
611 n
= div_u64_rem(n
, c
, r
);
620 * snd_interval_refine - refine the interval value of configurator
621 * @i: the interval value to refine
622 * @v: the interval value to refer to
624 * Refines the interval value with the reference value.
625 * The interval is changed to the range satisfying both intervals.
626 * The interval status (min, max, integer, etc.) are evaluated.
628 * Returns non-zero if the value is changed, zero if not changed.
630 int snd_interval_refine(struct snd_interval
*i
, const struct snd_interval
*v
)
633 if (snd_BUG_ON(snd_interval_empty(i
)))
635 if (i
->min
< v
->min
) {
637 i
->openmin
= v
->openmin
;
639 } else if (i
->min
== v
->min
&& !i
->openmin
&& v
->openmin
) {
643 if (i
->max
> v
->max
) {
645 i
->openmax
= v
->openmax
;
647 } else if (i
->max
== v
->max
&& !i
->openmax
&& v
->openmax
) {
651 if (!i
->integer
&& v
->integer
) {
664 } else if (!i
->openmin
&& !i
->openmax
&& i
->min
== i
->max
)
666 if (snd_interval_checkempty(i
)) {
667 snd_interval_none(i
);
673 EXPORT_SYMBOL(snd_interval_refine
);
675 static int snd_interval_refine_first(struct snd_interval
*i
)
677 if (snd_BUG_ON(snd_interval_empty(i
)))
679 if (snd_interval_single(i
))
682 i
->openmax
= i
->openmin
;
688 static int snd_interval_refine_last(struct snd_interval
*i
)
690 if (snd_BUG_ON(snd_interval_empty(i
)))
692 if (snd_interval_single(i
))
695 i
->openmin
= i
->openmax
;
701 void snd_interval_mul(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
703 if (a
->empty
|| b
->empty
) {
704 snd_interval_none(c
);
708 c
->min
= mul(a
->min
, b
->min
);
709 c
->openmin
= (a
->openmin
|| b
->openmin
);
710 c
->max
= mul(a
->max
, b
->max
);
711 c
->openmax
= (a
->openmax
|| b
->openmax
);
712 c
->integer
= (a
->integer
&& b
->integer
);
716 * snd_interval_div - refine the interval value with division
723 * Returns non-zero if the value is changed, zero if not changed.
725 void snd_interval_div(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
728 if (a
->empty
|| b
->empty
) {
729 snd_interval_none(c
);
733 c
->min
= div32(a
->min
, b
->max
, &r
);
734 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
736 c
->max
= div32(a
->max
, b
->min
, &r
);
741 c
->openmax
= (a
->openmax
|| b
->openmin
);
750 * snd_interval_muldivk - refine the interval value
753 * @k: divisor (as integer)
758 * Returns non-zero if the value is changed, zero if not changed.
760 void snd_interval_muldivk(const struct snd_interval
*a
, const struct snd_interval
*b
,
761 unsigned int k
, struct snd_interval
*c
)
764 if (a
->empty
|| b
->empty
) {
765 snd_interval_none(c
);
769 c
->min
= muldiv32(a
->min
, b
->min
, k
, &r
);
770 c
->openmin
= (r
|| a
->openmin
|| b
->openmin
);
771 c
->max
= muldiv32(a
->max
, b
->max
, k
, &r
);
776 c
->openmax
= (a
->openmax
|| b
->openmax
);
781 * snd_interval_mulkdiv - refine the interval value
783 * @k: dividend 2 (as integer)
789 * Returns non-zero if the value is changed, zero if not changed.
791 void snd_interval_mulkdiv(const struct snd_interval
*a
, unsigned int k
,
792 const struct snd_interval
*b
, struct snd_interval
*c
)
795 if (a
->empty
|| b
->empty
) {
796 snd_interval_none(c
);
800 c
->min
= muldiv32(a
->min
, k
, b
->max
, &r
);
801 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
803 c
->max
= muldiv32(a
->max
, k
, b
->min
, &r
);
808 c
->openmax
= (a
->openmax
|| b
->openmin
);
820 * snd_interval_ratnum - refine the interval value
821 * @i: interval to refine
822 * @rats_count: number of ratnum_t
823 * @rats: ratnum_t array
824 * @nump: pointer to store the resultant numerator
825 * @denp: pointer to store the resultant denominator
827 * Returns non-zero if the value is changed, zero if not changed.
829 int snd_interval_ratnum(struct snd_interval
*i
,
830 unsigned int rats_count
, struct snd_ratnum
*rats
,
831 unsigned int *nump
, unsigned int *denp
)
833 unsigned int best_num
, best_den
;
836 struct snd_interval t
;
838 unsigned int result_num
, result_den
;
841 best_num
= best_den
= best_diff
= 0;
842 for (k
= 0; k
< rats_count
; ++k
) {
843 unsigned int num
= rats
[k
].num
;
845 unsigned int q
= i
->min
;
849 den
= div_up(num
, q
);
850 if (den
< rats
[k
].den_min
)
852 if (den
> rats
[k
].den_max
)
853 den
= rats
[k
].den_max
;
856 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
860 diff
= num
- q
* den
;
864 diff
* best_den
< best_diff
* den
) {
874 t
.min
= div_down(best_num
, best_den
);
875 t
.openmin
= !!(best_num
% best_den
);
877 result_num
= best_num
;
878 result_diff
= best_diff
;
879 result_den
= best_den
;
880 best_num
= best_den
= best_diff
= 0;
881 for (k
= 0; k
< rats_count
; ++k
) {
882 unsigned int num
= rats
[k
].num
;
884 unsigned int q
= i
->max
;
890 den
= div_down(num
, q
);
891 if (den
> rats
[k
].den_max
)
893 if (den
< rats
[k
].den_min
)
894 den
= rats
[k
].den_min
;
897 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
899 den
+= rats
[k
].den_step
- r
;
901 diff
= q
* den
- num
;
905 diff
* best_den
< best_diff
* den
) {
915 t
.max
= div_up(best_num
, best_den
);
916 t
.openmax
= !!(best_num
% best_den
);
918 err
= snd_interval_refine(i
, &t
);
922 if (snd_interval_single(i
)) {
923 if (best_diff
* result_den
< result_diff
* best_den
) {
924 result_num
= best_num
;
925 result_den
= best_den
;
935 EXPORT_SYMBOL(snd_interval_ratnum
);
938 * snd_interval_ratden - refine the interval value
939 * @i: interval to refine
940 * @rats_count: number of struct ratden
941 * @rats: struct ratden array
942 * @nump: pointer to store the resultant numerator
943 * @denp: pointer to store the resultant denominator
945 * Returns non-zero if the value is changed, zero if not changed.
947 static int snd_interval_ratden(struct snd_interval
*i
,
948 unsigned int rats_count
, struct snd_ratden
*rats
,
949 unsigned int *nump
, unsigned int *denp
)
951 unsigned int best_num
, best_diff
, best_den
;
953 struct snd_interval t
;
956 best_num
= best_den
= best_diff
= 0;
957 for (k
= 0; k
< rats_count
; ++k
) {
959 unsigned int den
= rats
[k
].den
;
960 unsigned int q
= i
->min
;
963 if (num
> rats
[k
].num_max
)
965 if (num
< rats
[k
].num_min
)
966 num
= rats
[k
].num_max
;
969 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
971 num
+= rats
[k
].num_step
- r
;
973 diff
= num
- q
* den
;
975 diff
* best_den
< best_diff
* den
) {
985 t
.min
= div_down(best_num
, best_den
);
986 t
.openmin
= !!(best_num
% best_den
);
988 best_num
= best_den
= best_diff
= 0;
989 for (k
= 0; k
< rats_count
; ++k
) {
991 unsigned int den
= rats
[k
].den
;
992 unsigned int q
= i
->max
;
995 if (num
< rats
[k
].num_min
)
997 if (num
> rats
[k
].num_max
)
998 num
= rats
[k
].num_max
;
1001 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
1005 diff
= q
* den
- num
;
1006 if (best_num
== 0 ||
1007 diff
* best_den
< best_diff
* den
) {
1013 if (best_den
== 0) {
1017 t
.max
= div_up(best_num
, best_den
);
1018 t
.openmax
= !!(best_num
% best_den
);
1020 err
= snd_interval_refine(i
, &t
);
1024 if (snd_interval_single(i
)) {
1034 * snd_interval_list - refine the interval value from the list
1035 * @i: the interval value to refine
1036 * @count: the number of elements in the list
1037 * @list: the value list
1038 * @mask: the bit-mask to evaluate
1040 * Refines the interval value from the list.
1041 * When mask is non-zero, only the elements corresponding to bit 1 are
1044 * Returns non-zero if the value is changed, zero if not changed.
1046 int snd_interval_list(struct snd_interval
*i
, unsigned int count
,
1047 const unsigned int *list
, unsigned int mask
)
1050 struct snd_interval list_range
;
1056 snd_interval_any(&list_range
);
1057 list_range
.min
= UINT_MAX
;
1059 for (k
= 0; k
< count
; k
++) {
1060 if (mask
&& !(mask
& (1 << k
)))
1062 if (!snd_interval_test(i
, list
[k
]))
1064 list_range
.min
= min(list_range
.min
, list
[k
]);
1065 list_range
.max
= max(list_range
.max
, list
[k
]);
1067 return snd_interval_refine(i
, &list_range
);
1070 EXPORT_SYMBOL(snd_interval_list
);
1072 static int snd_interval_step(struct snd_interval
*i
, unsigned int min
, unsigned int step
)
1076 n
= (i
->min
- min
) % step
;
1077 if (n
!= 0 || i
->openmin
) {
1081 n
= (i
->max
- min
) % step
;
1082 if (n
!= 0 || i
->openmax
) {
1086 if (snd_interval_checkempty(i
)) {
1093 /* Info constraints helpers */
1096 * snd_pcm_hw_rule_add - add the hw-constraint rule
1097 * @runtime: the pcm runtime instance
1098 * @cond: condition bits
1099 * @var: the variable to evaluate
1100 * @func: the evaluation function
1101 * @private: the private data pointer passed to function
1102 * @dep: the dependent variables
1104 * Returns zero if successful, or a negative error code on failure.
1106 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
, unsigned int cond
,
1108 snd_pcm_hw_rule_func_t func
, void *private,
1111 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1112 struct snd_pcm_hw_rule
*c
;
1115 va_start(args
, dep
);
1116 if (constrs
->rules_num
>= constrs
->rules_all
) {
1117 struct snd_pcm_hw_rule
*new;
1118 unsigned int new_rules
= constrs
->rules_all
+ 16;
1119 new = kcalloc(new_rules
, sizeof(*c
), GFP_KERNEL
);
1124 if (constrs
->rules
) {
1125 memcpy(new, constrs
->rules
,
1126 constrs
->rules_num
* sizeof(*c
));
1127 kfree(constrs
->rules
);
1129 constrs
->rules
= new;
1130 constrs
->rules_all
= new_rules
;
1132 c
= &constrs
->rules
[constrs
->rules_num
];
1136 c
->private = private;
1139 if (snd_BUG_ON(k
>= ARRAY_SIZE(c
->deps
))) {
1146 dep
= va_arg(args
, int);
1148 constrs
->rules_num
++;
1153 EXPORT_SYMBOL(snd_pcm_hw_rule_add
);
1156 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1157 * @runtime: PCM runtime instance
1158 * @var: hw_params variable to apply the mask
1159 * @mask: the bitmap mask
1161 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1163 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1166 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1167 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1168 *maskp
->bits
&= mask
;
1169 memset(maskp
->bits
+ 1, 0, (SNDRV_MASK_MAX
-32) / 8); /* clear rest */
1170 if (*maskp
->bits
== 0)
1176 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1177 * @runtime: PCM runtime instance
1178 * @var: hw_params variable to apply the mask
1179 * @mask: the 64bit bitmap mask
1181 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1183 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1186 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1187 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1188 maskp
->bits
[0] &= (u_int32_t
)mask
;
1189 maskp
->bits
[1] &= (u_int32_t
)(mask
>> 32);
1190 memset(maskp
->bits
+ 2, 0, (SNDRV_MASK_MAX
-64) / 8); /* clear rest */
1191 if (! maskp
->bits
[0] && ! maskp
->bits
[1])
1197 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1198 * @runtime: PCM runtime instance
1199 * @var: hw_params variable to apply the integer constraint
1201 * Apply the constraint of integer to an interval parameter.
1203 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
)
1205 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1206 return snd_interval_setinteger(constrs_interval(constrs
, var
));
1209 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer
);
1212 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1213 * @runtime: PCM runtime instance
1214 * @var: hw_params variable to apply the range
1215 * @min: the minimal value
1216 * @max: the maximal value
1218 * Apply the min/max range constraint to an interval parameter.
1220 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1221 unsigned int min
, unsigned int max
)
1223 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1224 struct snd_interval t
;
1227 t
.openmin
= t
.openmax
= 0;
1229 return snd_interval_refine(constrs_interval(constrs
, var
), &t
);
1232 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax
);
1234 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params
*params
,
1235 struct snd_pcm_hw_rule
*rule
)
1237 struct snd_pcm_hw_constraint_list
*list
= rule
->private;
1238 return snd_interval_list(hw_param_interval(params
, rule
->var
), list
->count
, list
->list
, list
->mask
);
1243 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1244 * @runtime: PCM runtime instance
1245 * @cond: condition bits
1246 * @var: hw_params variable to apply the list constraint
1249 * Apply the list of constraints to an interval parameter.
1251 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
1253 snd_pcm_hw_param_t var
,
1254 const struct snd_pcm_hw_constraint_list
*l
)
1256 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1257 snd_pcm_hw_rule_list
, (void *)l
,
1261 EXPORT_SYMBOL(snd_pcm_hw_constraint_list
);
1263 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params
*params
,
1264 struct snd_pcm_hw_rule
*rule
)
1266 struct snd_pcm_hw_constraint_ratnums
*r
= rule
->private;
1267 unsigned int num
= 0, den
= 0;
1269 err
= snd_interval_ratnum(hw_param_interval(params
, rule
->var
),
1270 r
->nrats
, r
->rats
, &num
, &den
);
1271 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1272 params
->rate_num
= num
;
1273 params
->rate_den
= den
;
1279 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1280 * @runtime: PCM runtime instance
1281 * @cond: condition bits
1282 * @var: hw_params variable to apply the ratnums constraint
1283 * @r: struct snd_ratnums constriants
1285 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
1287 snd_pcm_hw_param_t var
,
1288 struct snd_pcm_hw_constraint_ratnums
*r
)
1290 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1291 snd_pcm_hw_rule_ratnums
, r
,
1295 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums
);
1297 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params
*params
,
1298 struct snd_pcm_hw_rule
*rule
)
1300 struct snd_pcm_hw_constraint_ratdens
*r
= rule
->private;
1301 unsigned int num
= 0, den
= 0;
1302 int err
= snd_interval_ratden(hw_param_interval(params
, rule
->var
),
1303 r
->nrats
, r
->rats
, &num
, &den
);
1304 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1305 params
->rate_num
= num
;
1306 params
->rate_den
= den
;
1312 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1313 * @runtime: PCM runtime instance
1314 * @cond: condition bits
1315 * @var: hw_params variable to apply the ratdens constraint
1316 * @r: struct snd_ratdens constriants
1318 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
1320 snd_pcm_hw_param_t var
,
1321 struct snd_pcm_hw_constraint_ratdens
*r
)
1323 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1324 snd_pcm_hw_rule_ratdens
, r
,
1328 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens
);
1330 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params
*params
,
1331 struct snd_pcm_hw_rule
*rule
)
1333 unsigned int l
= (unsigned long) rule
->private;
1334 int width
= l
& 0xffff;
1335 unsigned int msbits
= l
>> 16;
1336 struct snd_interval
*i
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_SAMPLE_BITS
);
1337 if (snd_interval_single(i
) && snd_interval_value(i
) == width
)
1338 params
->msbits
= msbits
;
1343 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1344 * @runtime: PCM runtime instance
1345 * @cond: condition bits
1346 * @width: sample bits width
1347 * @msbits: msbits width
1349 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
1352 unsigned int msbits
)
1354 unsigned long l
= (msbits
<< 16) | width
;
1355 return snd_pcm_hw_rule_add(runtime
, cond
, -1,
1356 snd_pcm_hw_rule_msbits
,
1358 SNDRV_PCM_HW_PARAM_SAMPLE_BITS
, -1);
1361 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits
);
1363 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params
*params
,
1364 struct snd_pcm_hw_rule
*rule
)
1366 unsigned long step
= (unsigned long) rule
->private;
1367 return snd_interval_step(hw_param_interval(params
, rule
->var
), 0, step
);
1371 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1372 * @runtime: PCM runtime instance
1373 * @cond: condition bits
1374 * @var: hw_params variable to apply the step constraint
1377 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
1379 snd_pcm_hw_param_t var
,
1382 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1383 snd_pcm_hw_rule_step
, (void *) step
,
1387 EXPORT_SYMBOL(snd_pcm_hw_constraint_step
);
1389 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params
*params
, struct snd_pcm_hw_rule
*rule
)
1391 static unsigned int pow2_sizes
[] = {
1392 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1393 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1394 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1395 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1397 return snd_interval_list(hw_param_interval(params
, rule
->var
),
1398 ARRAY_SIZE(pow2_sizes
), pow2_sizes
, 0);
1402 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1403 * @runtime: PCM runtime instance
1404 * @cond: condition bits
1405 * @var: hw_params variable to apply the power-of-2 constraint
1407 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
1409 snd_pcm_hw_param_t var
)
1411 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1412 snd_pcm_hw_rule_pow2
, NULL
,
1416 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2
);
1418 static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params
*params
,
1419 struct snd_pcm_hw_rule
*rule
)
1421 unsigned int base_rate
= (unsigned int)(uintptr_t)rule
->private;
1422 struct snd_interval
*rate
;
1424 rate
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_RATE
);
1425 return snd_interval_list(rate
, 1, &base_rate
, 0);
1429 * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
1430 * @runtime: PCM runtime instance
1431 * @base_rate: the rate at which the hardware does not resample
1433 int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime
*runtime
,
1434 unsigned int base_rate
)
1436 return snd_pcm_hw_rule_add(runtime
, SNDRV_PCM_HW_PARAMS_NORESAMPLE
,
1437 SNDRV_PCM_HW_PARAM_RATE
,
1438 snd_pcm_hw_rule_noresample_func
,
1439 (void *)(uintptr_t)base_rate
,
1440 SNDRV_PCM_HW_PARAM_RATE
, -1);
1442 EXPORT_SYMBOL(snd_pcm_hw_rule_noresample
);
1444 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params
*params
,
1445 snd_pcm_hw_param_t var
)
1447 if (hw_is_mask(var
)) {
1448 snd_mask_any(hw_param_mask(params
, var
));
1449 params
->cmask
|= 1 << var
;
1450 params
->rmask
|= 1 << var
;
1453 if (hw_is_interval(var
)) {
1454 snd_interval_any(hw_param_interval(params
, var
));
1455 params
->cmask
|= 1 << var
;
1456 params
->rmask
|= 1 << var
;
1462 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
)
1465 memset(params
, 0, sizeof(*params
));
1466 for (k
= SNDRV_PCM_HW_PARAM_FIRST_MASK
; k
<= SNDRV_PCM_HW_PARAM_LAST_MASK
; k
++)
1467 _snd_pcm_hw_param_any(params
, k
);
1468 for (k
= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
; k
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
; k
++)
1469 _snd_pcm_hw_param_any(params
, k
);
1473 EXPORT_SYMBOL(_snd_pcm_hw_params_any
);
1476 * snd_pcm_hw_param_value - return @params field @var value
1477 * @params: the hw_params instance
1478 * @var: parameter to retrieve
1479 * @dir: pointer to the direction (-1,0,1) or %NULL
1481 * Return the value for field @var if it's fixed in configuration space
1482 * defined by @params. Return -%EINVAL otherwise.
1484 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
1485 snd_pcm_hw_param_t var
, int *dir
)
1487 if (hw_is_mask(var
)) {
1488 const struct snd_mask
*mask
= hw_param_mask_c(params
, var
);
1489 if (!snd_mask_single(mask
))
1493 return snd_mask_value(mask
);
1495 if (hw_is_interval(var
)) {
1496 const struct snd_interval
*i
= hw_param_interval_c(params
, var
);
1497 if (!snd_interval_single(i
))
1501 return snd_interval_value(i
);
1506 EXPORT_SYMBOL(snd_pcm_hw_param_value
);
1508 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
,
1509 snd_pcm_hw_param_t var
)
1511 if (hw_is_mask(var
)) {
1512 snd_mask_none(hw_param_mask(params
, var
));
1513 params
->cmask
|= 1 << var
;
1514 params
->rmask
|= 1 << var
;
1515 } else if (hw_is_interval(var
)) {
1516 snd_interval_none(hw_param_interval(params
, var
));
1517 params
->cmask
|= 1 << var
;
1518 params
->rmask
|= 1 << var
;
1524 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty
);
1526 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params
*params
,
1527 snd_pcm_hw_param_t var
)
1530 if (hw_is_mask(var
))
1531 changed
= snd_mask_refine_first(hw_param_mask(params
, var
));
1532 else if (hw_is_interval(var
))
1533 changed
= snd_interval_refine_first(hw_param_interval(params
, var
));
1537 params
->cmask
|= 1 << var
;
1538 params
->rmask
|= 1 << var
;
1545 * snd_pcm_hw_param_first - refine config space and return minimum value
1546 * @pcm: PCM instance
1547 * @params: the hw_params instance
1548 * @var: parameter to retrieve
1549 * @dir: pointer to the direction (-1,0,1) or %NULL
1551 * Inside configuration space defined by @params remove from @var all
1552 * values > minimum. Reduce configuration space accordingly.
1553 * Return the minimum.
1555 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
1556 struct snd_pcm_hw_params
*params
,
1557 snd_pcm_hw_param_t var
, int *dir
)
1559 int changed
= _snd_pcm_hw_param_first(params
, var
);
1562 if (params
->rmask
) {
1563 int err
= snd_pcm_hw_refine(pcm
, params
);
1564 if (snd_BUG_ON(err
< 0))
1567 return snd_pcm_hw_param_value(params
, var
, dir
);
1570 EXPORT_SYMBOL(snd_pcm_hw_param_first
);
1572 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params
*params
,
1573 snd_pcm_hw_param_t var
)
1576 if (hw_is_mask(var
))
1577 changed
= snd_mask_refine_last(hw_param_mask(params
, var
));
1578 else if (hw_is_interval(var
))
1579 changed
= snd_interval_refine_last(hw_param_interval(params
, var
));
1583 params
->cmask
|= 1 << var
;
1584 params
->rmask
|= 1 << var
;
1591 * snd_pcm_hw_param_last - refine config space and return maximum value
1592 * @pcm: PCM instance
1593 * @params: the hw_params instance
1594 * @var: parameter to retrieve
1595 * @dir: pointer to the direction (-1,0,1) or %NULL
1597 * Inside configuration space defined by @params remove from @var all
1598 * values < maximum. Reduce configuration space accordingly.
1599 * Return the maximum.
1601 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
1602 struct snd_pcm_hw_params
*params
,
1603 snd_pcm_hw_param_t var
, int *dir
)
1605 int changed
= _snd_pcm_hw_param_last(params
, var
);
1608 if (params
->rmask
) {
1609 int err
= snd_pcm_hw_refine(pcm
, params
);
1610 if (snd_BUG_ON(err
< 0))
1613 return snd_pcm_hw_param_value(params
, var
, dir
);
1616 EXPORT_SYMBOL(snd_pcm_hw_param_last
);
1619 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1620 * @pcm: PCM instance
1621 * @params: the hw_params instance
1623 * Choose one configuration from configuration space defined by @params.
1624 * The configuration chosen is that obtained fixing in this order:
1625 * first access, first format, first subformat, min channels,
1626 * min rate, min period time, max buffer size, min tick time
1628 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*pcm
,
1629 struct snd_pcm_hw_params
*params
)
1631 static int vars
[] = {
1632 SNDRV_PCM_HW_PARAM_ACCESS
,
1633 SNDRV_PCM_HW_PARAM_FORMAT
,
1634 SNDRV_PCM_HW_PARAM_SUBFORMAT
,
1635 SNDRV_PCM_HW_PARAM_CHANNELS
,
1636 SNDRV_PCM_HW_PARAM_RATE
,
1637 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1638 SNDRV_PCM_HW_PARAM_BUFFER_SIZE
,
1639 SNDRV_PCM_HW_PARAM_TICK_TIME
,
1644 for (v
= vars
; *v
!= -1; v
++) {
1645 if (*v
!= SNDRV_PCM_HW_PARAM_BUFFER_SIZE
)
1646 err
= snd_pcm_hw_param_first(pcm
, params
, *v
, NULL
);
1648 err
= snd_pcm_hw_param_last(pcm
, params
, *v
, NULL
);
1649 if (snd_BUG_ON(err
< 0))
1655 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream
*substream
,
1658 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1659 unsigned long flags
;
1660 snd_pcm_stream_lock_irqsave(substream
, flags
);
1661 if (snd_pcm_running(substream
) &&
1662 snd_pcm_update_hw_ptr(substream
) >= 0)
1663 runtime
->status
->hw_ptr
%= runtime
->buffer_size
;
1665 runtime
->status
->hw_ptr
= 0;
1666 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1670 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream
*substream
,
1673 struct snd_pcm_channel_info
*info
= arg
;
1674 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1676 if (!(runtime
->info
& SNDRV_PCM_INFO_MMAP
)) {
1680 width
= snd_pcm_format_physical_width(runtime
->format
);
1684 switch (runtime
->access
) {
1685 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
:
1686 case SNDRV_PCM_ACCESS_RW_INTERLEAVED
:
1687 info
->first
= info
->channel
* width
;
1688 info
->step
= runtime
->channels
* width
;
1690 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED
:
1691 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
:
1693 size_t size
= runtime
->dma_bytes
/ runtime
->channels
;
1694 info
->first
= info
->channel
* size
* 8;
1705 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream
*substream
,
1708 struct snd_pcm_hw_params
*params
= arg
;
1709 snd_pcm_format_t format
;
1710 int channels
, width
;
1712 params
->fifo_size
= substream
->runtime
->hw
.fifo_size
;
1713 if (!(substream
->runtime
->hw
.info
& SNDRV_PCM_INFO_FIFO_IN_FRAMES
)) {
1714 format
= params_format(params
);
1715 channels
= params_channels(params
);
1716 width
= snd_pcm_format_physical_width(format
);
1717 params
->fifo_size
/= width
* channels
;
1723 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1724 * @substream: the pcm substream instance
1725 * @cmd: ioctl command
1726 * @arg: ioctl argument
1728 * Processes the generic ioctl commands for PCM.
1729 * Can be passed as the ioctl callback for PCM ops.
1731 * Returns zero if successful, or a negative error code on failure.
1733 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
1734 unsigned int cmd
, void *arg
)
1737 case SNDRV_PCM_IOCTL1_INFO
:
1739 case SNDRV_PCM_IOCTL1_RESET
:
1740 return snd_pcm_lib_ioctl_reset(substream
, arg
);
1741 case SNDRV_PCM_IOCTL1_CHANNEL_INFO
:
1742 return snd_pcm_lib_ioctl_channel_info(substream
, arg
);
1743 case SNDRV_PCM_IOCTL1_FIFO_SIZE
:
1744 return snd_pcm_lib_ioctl_fifo_size(substream
, arg
);
1749 EXPORT_SYMBOL(snd_pcm_lib_ioctl
);
1752 * snd_pcm_period_elapsed - update the pcm status for the next period
1753 * @substream: the pcm substream instance
1755 * This function is called from the interrupt handler when the
1756 * PCM has processed the period size. It will update the current
1757 * pointer, wake up sleepers, etc.
1759 * Even if more than one periods have elapsed since the last call, you
1760 * have to call this only once.
1762 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
)
1764 struct snd_pcm_runtime
*runtime
;
1765 unsigned long flags
;
1767 if (PCM_RUNTIME_CHECK(substream
))
1769 runtime
= substream
->runtime
;
1771 if (runtime
->transfer_ack_begin
)
1772 runtime
->transfer_ack_begin(substream
);
1774 snd_pcm_stream_lock_irqsave(substream
, flags
);
1775 if (!snd_pcm_running(substream
) ||
1776 snd_pcm_update_hw_ptr0(substream
, 1) < 0)
1779 if (substream
->timer_running
)
1780 snd_timer_interrupt(substream
->timer
, 1);
1782 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1783 if (runtime
->transfer_ack_end
)
1784 runtime
->transfer_ack_end(substream
);
1785 kill_fasync(&runtime
->fasync
, SIGIO
, POLL_IN
);
1788 EXPORT_SYMBOL(snd_pcm_period_elapsed
);
1791 * Wait until avail_min data becomes available
1792 * Returns a negative error code if any error occurs during operation.
1793 * The available space is stored on availp. When err = 0 and avail = 0
1794 * on the capture stream, it indicates the stream is in DRAINING state.
1796 static int wait_for_avail(struct snd_pcm_substream
*substream
,
1797 snd_pcm_uframes_t
*availp
)
1799 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1800 int is_playback
= substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
;
1803 snd_pcm_uframes_t avail
= 0;
1804 long wait_time
, tout
;
1806 init_waitqueue_entry(&wait
, current
);
1807 set_current_state(TASK_INTERRUPTIBLE
);
1808 add_wait_queue(&runtime
->tsleep
, &wait
);
1810 if (runtime
->no_period_wakeup
)
1811 wait_time
= MAX_SCHEDULE_TIMEOUT
;
1814 if (runtime
->rate
) {
1815 long t
= runtime
->period_size
* 2 / runtime
->rate
;
1816 wait_time
= max(t
, wait_time
);
1818 wait_time
= msecs_to_jiffies(wait_time
* 1000);
1822 if (signal_pending(current
)) {
1828 * We need to check if space became available already
1829 * (and thus the wakeup happened already) first to close
1830 * the race of space already having become available.
1831 * This check must happen after been added to the waitqueue
1832 * and having current state be INTERRUPTIBLE.
1835 avail
= snd_pcm_playback_avail(runtime
);
1837 avail
= snd_pcm_capture_avail(runtime
);
1838 if (avail
>= runtime
->twake
)
1840 snd_pcm_stream_unlock_irq(substream
);
1842 tout
= schedule_timeout(wait_time
);
1844 snd_pcm_stream_lock_irq(substream
);
1845 set_current_state(TASK_INTERRUPTIBLE
);
1846 switch (runtime
->status
->state
) {
1847 case SNDRV_PCM_STATE_SUSPENDED
:
1850 case SNDRV_PCM_STATE_XRUN
:
1853 case SNDRV_PCM_STATE_DRAINING
:
1857 avail
= 0; /* indicate draining */
1859 case SNDRV_PCM_STATE_OPEN
:
1860 case SNDRV_PCM_STATE_SETUP
:
1861 case SNDRV_PCM_STATE_DISCONNECTED
:
1866 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1867 is_playback
? "playback" : "capture");
1873 set_current_state(TASK_RUNNING
);
1874 remove_wait_queue(&runtime
->tsleep
, &wait
);
1879 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream
*substream
,
1881 unsigned long data
, unsigned int off
,
1882 snd_pcm_uframes_t frames
)
1884 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1886 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1887 if (substream
->ops
->copy
) {
1888 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1891 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1892 if (copy_from_user(hwbuf
, buf
, frames_to_bytes(runtime
, frames
)))
1898 typedef int (*transfer_f
)(struct snd_pcm_substream
*substream
, unsigned int hwoff
,
1899 unsigned long data
, unsigned int off
,
1900 snd_pcm_uframes_t size
);
1902 static snd_pcm_sframes_t
snd_pcm_lib_write1(struct snd_pcm_substream
*substream
,
1904 snd_pcm_uframes_t size
,
1906 transfer_f transfer
)
1908 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1909 snd_pcm_uframes_t xfer
= 0;
1910 snd_pcm_uframes_t offset
= 0;
1911 snd_pcm_uframes_t avail
;
1917 snd_pcm_stream_lock_irq(substream
);
1918 switch (runtime
->status
->state
) {
1919 case SNDRV_PCM_STATE_PREPARED
:
1920 case SNDRV_PCM_STATE_RUNNING
:
1921 case SNDRV_PCM_STATE_PAUSED
:
1923 case SNDRV_PCM_STATE_XRUN
:
1926 case SNDRV_PCM_STATE_SUSPENDED
:
1934 runtime
->twake
= runtime
->control
->avail_min
? : 1;
1935 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1936 snd_pcm_update_hw_ptr(substream
);
1937 avail
= snd_pcm_playback_avail(runtime
);
1939 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1940 snd_pcm_uframes_t cont
;
1946 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
1947 runtime
->control
->avail_min
? : 1);
1948 err
= wait_for_avail(substream
, &avail
);
1952 frames
= size
> avail
? avail
: size
;
1953 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
1956 if (snd_BUG_ON(!frames
)) {
1958 snd_pcm_stream_unlock_irq(substream
);
1961 appl_ptr
= runtime
->control
->appl_ptr
;
1962 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
1963 snd_pcm_stream_unlock_irq(substream
);
1964 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
1965 snd_pcm_stream_lock_irq(substream
);
1968 switch (runtime
->status
->state
) {
1969 case SNDRV_PCM_STATE_XRUN
:
1972 case SNDRV_PCM_STATE_SUSPENDED
:
1979 if (appl_ptr
>= runtime
->boundary
)
1980 appl_ptr
-= runtime
->boundary
;
1981 runtime
->control
->appl_ptr
= appl_ptr
;
1982 if (substream
->ops
->ack
)
1983 substream
->ops
->ack(substream
);
1989 if (runtime
->status
->state
== SNDRV_PCM_STATE_PREPARED
&&
1990 snd_pcm_playback_hw_avail(runtime
) >= (snd_pcm_sframes_t
)runtime
->start_threshold
) {
1991 err
= snd_pcm_start(substream
);
1998 if (xfer
> 0 && err
>= 0)
1999 snd_pcm_update_state(substream
, runtime
);
2000 snd_pcm_stream_unlock_irq(substream
);
2001 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2004 /* sanity-check for read/write methods */
2005 static int pcm_sanity_check(struct snd_pcm_substream
*substream
)
2007 struct snd_pcm_runtime
*runtime
;
2008 if (PCM_RUNTIME_CHECK(substream
))
2010 runtime
= substream
->runtime
;
2011 if (snd_BUG_ON(!substream
->ops
->copy
&& !runtime
->dma_area
))
2013 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2018 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
, const void __user
*buf
, snd_pcm_uframes_t size
)
2020 struct snd_pcm_runtime
*runtime
;
2024 err
= pcm_sanity_check(substream
);
2027 runtime
= substream
->runtime
;
2028 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2030 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
&&
2031 runtime
->channels
> 1)
2033 return snd_pcm_lib_write1(substream
, (unsigned long)buf
, size
, nonblock
,
2034 snd_pcm_lib_write_transfer
);
2037 EXPORT_SYMBOL(snd_pcm_lib_write
);
2039 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream
*substream
,
2041 unsigned long data
, unsigned int off
,
2042 snd_pcm_uframes_t frames
)
2044 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2046 void __user
**bufs
= (void __user
**)data
;
2047 int channels
= runtime
->channels
;
2049 if (substream
->ops
->copy
) {
2050 if (snd_BUG_ON(!substream
->ops
->silence
))
2052 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2053 if (*bufs
== NULL
) {
2054 if ((err
= substream
->ops
->silence(substream
, c
, hwoff
, frames
)) < 0)
2057 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2058 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2063 /* default transfer behaviour */
2064 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
2065 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2066 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2067 if (*bufs
== NULL
) {
2068 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, frames
);
2070 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2071 if (copy_from_user(hwbuf
, buf
, samples_to_bytes(runtime
, frames
)))
2079 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
2081 snd_pcm_uframes_t frames
)
2083 struct snd_pcm_runtime
*runtime
;
2087 err
= pcm_sanity_check(substream
);
2090 runtime
= substream
->runtime
;
2091 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2093 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2095 return snd_pcm_lib_write1(substream
, (unsigned long)bufs
, frames
,
2096 nonblock
, snd_pcm_lib_writev_transfer
);
2099 EXPORT_SYMBOL(snd_pcm_lib_writev
);
2101 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream
*substream
,
2103 unsigned long data
, unsigned int off
,
2104 snd_pcm_uframes_t frames
)
2106 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2108 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
2109 if (substream
->ops
->copy
) {
2110 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
2113 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
2114 if (copy_to_user(buf
, hwbuf
, frames_to_bytes(runtime
, frames
)))
2120 static snd_pcm_sframes_t
snd_pcm_lib_read1(struct snd_pcm_substream
*substream
,
2122 snd_pcm_uframes_t size
,
2124 transfer_f transfer
)
2126 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2127 snd_pcm_uframes_t xfer
= 0;
2128 snd_pcm_uframes_t offset
= 0;
2129 snd_pcm_uframes_t avail
;
2135 snd_pcm_stream_lock_irq(substream
);
2136 switch (runtime
->status
->state
) {
2137 case SNDRV_PCM_STATE_PREPARED
:
2138 if (size
>= runtime
->start_threshold
) {
2139 err
= snd_pcm_start(substream
);
2144 case SNDRV_PCM_STATE_DRAINING
:
2145 case SNDRV_PCM_STATE_RUNNING
:
2146 case SNDRV_PCM_STATE_PAUSED
:
2148 case SNDRV_PCM_STATE_XRUN
:
2151 case SNDRV_PCM_STATE_SUSPENDED
:
2159 runtime
->twake
= runtime
->control
->avail_min
? : 1;
2160 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
2161 snd_pcm_update_hw_ptr(substream
);
2162 avail
= snd_pcm_capture_avail(runtime
);
2164 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
2165 snd_pcm_uframes_t cont
;
2167 if (runtime
->status
->state
==
2168 SNDRV_PCM_STATE_DRAINING
) {
2169 snd_pcm_stop(substream
, SNDRV_PCM_STATE_SETUP
);
2176 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
2177 runtime
->control
->avail_min
? : 1);
2178 err
= wait_for_avail(substream
, &avail
);
2182 continue; /* draining */
2184 frames
= size
> avail
? avail
: size
;
2185 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
2188 if (snd_BUG_ON(!frames
)) {
2190 snd_pcm_stream_unlock_irq(substream
);
2193 appl_ptr
= runtime
->control
->appl_ptr
;
2194 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2195 snd_pcm_stream_unlock_irq(substream
);
2196 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
2197 snd_pcm_stream_lock_irq(substream
);
2200 switch (runtime
->status
->state
) {
2201 case SNDRV_PCM_STATE_XRUN
:
2204 case SNDRV_PCM_STATE_SUSPENDED
:
2211 if (appl_ptr
>= runtime
->boundary
)
2212 appl_ptr
-= runtime
->boundary
;
2213 runtime
->control
->appl_ptr
= appl_ptr
;
2214 if (substream
->ops
->ack
)
2215 substream
->ops
->ack(substream
);
2224 if (xfer
> 0 && err
>= 0)
2225 snd_pcm_update_state(substream
, runtime
);
2226 snd_pcm_stream_unlock_irq(substream
);
2227 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2230 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
, void __user
*buf
, snd_pcm_uframes_t size
)
2232 struct snd_pcm_runtime
*runtime
;
2236 err
= pcm_sanity_check(substream
);
2239 runtime
= substream
->runtime
;
2240 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2241 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
2243 return snd_pcm_lib_read1(substream
, (unsigned long)buf
, size
, nonblock
, snd_pcm_lib_read_transfer
);
2246 EXPORT_SYMBOL(snd_pcm_lib_read
);
2248 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream
*substream
,
2250 unsigned long data
, unsigned int off
,
2251 snd_pcm_uframes_t frames
)
2253 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2255 void __user
**bufs
= (void __user
**)data
;
2256 int channels
= runtime
->channels
;
2258 if (substream
->ops
->copy
) {
2259 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2263 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2264 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2268 snd_pcm_uframes_t dma_csize
= runtime
->dma_bytes
/ channels
;
2269 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2275 hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2276 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2277 if (copy_to_user(buf
, hwbuf
, samples_to_bytes(runtime
, frames
)))
2284 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
2286 snd_pcm_uframes_t frames
)
2288 struct snd_pcm_runtime
*runtime
;
2292 err
= pcm_sanity_check(substream
);
2295 runtime
= substream
->runtime
;
2296 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2299 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2300 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2302 return snd_pcm_lib_read1(substream
, (unsigned long)bufs
, frames
, nonblock
, snd_pcm_lib_readv_transfer
);
2305 EXPORT_SYMBOL(snd_pcm_lib_readv
);
2308 * standard channel mapping helpers
2311 /* default channel maps for multi-channel playbacks, up to 8 channels */
2312 const struct snd_pcm_chmap_elem snd_pcm_std_chmaps
[] = {
2314 .map
= { SNDRV_CHMAP_MONO
} },
2316 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
} },
2318 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2319 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2321 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2322 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2323 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
} },
2325 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2326 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2327 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2328 SNDRV_CHMAP_SL
, SNDRV_CHMAP_SR
} },
2331 EXPORT_SYMBOL_GPL(snd_pcm_std_chmaps
);
2333 /* alternative channel maps with CLFE <-> surround swapped for 6/8 channels */
2334 const struct snd_pcm_chmap_elem snd_pcm_alt_chmaps
[] = {
2336 .map
= { SNDRV_CHMAP_MONO
} },
2338 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
} },
2340 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2341 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2343 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2344 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2345 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
} },
2347 .map
= { SNDRV_CHMAP_FL
, SNDRV_CHMAP_FR
,
2348 SNDRV_CHMAP_FC
, SNDRV_CHMAP_LFE
,
2349 SNDRV_CHMAP_RL
, SNDRV_CHMAP_RR
,
2350 SNDRV_CHMAP_SL
, SNDRV_CHMAP_SR
} },
2353 EXPORT_SYMBOL_GPL(snd_pcm_alt_chmaps
);
2355 static bool valid_chmap_channels(const struct snd_pcm_chmap
*info
, int ch
)
2357 if (ch
> info
->max_channels
)
2359 return !info
->channel_mask
|| (info
->channel_mask
& (1U << ch
));
2362 static int pcm_chmap_ctl_info(struct snd_kcontrol
*kcontrol
,
2363 struct snd_ctl_elem_info
*uinfo
)
2365 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2367 uinfo
->type
= SNDRV_CTL_ELEM_TYPE_INTEGER
;
2369 uinfo
->count
= info
->max_channels
;
2370 uinfo
->value
.integer
.min
= 0;
2371 uinfo
->value
.integer
.max
= SNDRV_CHMAP_LAST
;
2375 /* get callback for channel map ctl element
2376 * stores the channel position firstly matching with the current channels
2378 static int pcm_chmap_ctl_get(struct snd_kcontrol
*kcontrol
,
2379 struct snd_ctl_elem_value
*ucontrol
)
2381 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2382 unsigned int idx
= snd_ctl_get_ioffidx(kcontrol
, &ucontrol
->id
);
2383 struct snd_pcm_substream
*substream
;
2384 const struct snd_pcm_chmap_elem
*map
;
2386 if (snd_BUG_ON(!info
->chmap
))
2388 substream
= snd_pcm_chmap_substream(info
, idx
);
2391 memset(ucontrol
->value
.integer
.value
, 0,
2392 sizeof(ucontrol
->value
.integer
.value
));
2393 if (!substream
->runtime
)
2394 return 0; /* no channels set */
2395 for (map
= info
->chmap
; map
->channels
; map
++) {
2397 if (map
->channels
== substream
->runtime
->channels
&&
2398 valid_chmap_channels(info
, map
->channels
)) {
2399 for (i
= 0; i
< map
->channels
; i
++)
2400 ucontrol
->value
.integer
.value
[i
] = map
->map
[i
];
2407 /* tlv callback for channel map ctl element
2408 * expands the pre-defined channel maps in a form of TLV
2410 static int pcm_chmap_ctl_tlv(struct snd_kcontrol
*kcontrol
, int op_flag
,
2411 unsigned int size
, unsigned int __user
*tlv
)
2413 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2414 const struct snd_pcm_chmap_elem
*map
;
2415 unsigned int __user
*dst
;
2418 if (snd_BUG_ON(!info
->chmap
))
2422 if (put_user(SNDRV_CTL_TLVT_CONTAINER
, tlv
))
2426 for (map
= info
->chmap
; map
->channels
; map
++) {
2427 int chs_bytes
= map
->channels
* 4;
2428 if (!valid_chmap_channels(info
, map
->channels
))
2432 if (put_user(SNDRV_CTL_TLVT_CHMAP_FIXED
, dst
) ||
2433 put_user(chs_bytes
, dst
+ 1))
2438 if (size
< chs_bytes
)
2442 for (c
= 0; c
< map
->channels
; c
++) {
2443 if (put_user(map
->map
[c
], dst
))
2448 if (put_user(count
, tlv
+ 1))
2453 static void pcm_chmap_ctl_private_free(struct snd_kcontrol
*kcontrol
)
2455 struct snd_pcm_chmap
*info
= snd_kcontrol_chip(kcontrol
);
2456 info
->pcm
->streams
[info
->stream
].chmap_kctl
= NULL
;
2461 * snd_pcm_add_chmap_ctls - create channel-mapping control elements
2462 * @pcm: the assigned PCM instance
2463 * @stream: stream direction
2464 * @chmap: channel map elements (for query)
2465 * @max_channels: the max number of channels for the stream
2466 * @private_value: the value passed to each kcontrol's private_value field
2467 * @info_ret: store struct snd_pcm_chmap instance if non-NULL
2469 * Create channel-mapping control elements assigned to the given PCM stream(s).
2470 * Returns zero if succeed, or a negative error value.
2472 int snd_pcm_add_chmap_ctls(struct snd_pcm
*pcm
, int stream
,
2473 const struct snd_pcm_chmap_elem
*chmap
,
2475 unsigned long private_value
,
2476 struct snd_pcm_chmap
**info_ret
)
2478 struct snd_pcm_chmap
*info
;
2479 struct snd_kcontrol_new knew
= {
2480 .iface
= SNDRV_CTL_ELEM_IFACE_PCM
,
2481 .access
= SNDRV_CTL_ELEM_ACCESS_READ
|
2482 SNDRV_CTL_ELEM_ACCESS_TLV_READ
|
2483 SNDRV_CTL_ELEM_ACCESS_TLV_CALLBACK
,
2484 .info
= pcm_chmap_ctl_info
,
2485 .get
= pcm_chmap_ctl_get
,
2486 .tlv
.c
= pcm_chmap_ctl_tlv
,
2490 info
= kzalloc(sizeof(*info
), GFP_KERNEL
);
2494 info
->stream
= stream
;
2495 info
->chmap
= chmap
;
2496 info
->max_channels
= max_channels
;
2497 if (stream
== SNDRV_PCM_STREAM_PLAYBACK
)
2498 knew
.name
= "Playback Channel Map";
2500 knew
.name
= "Capture Channel Map";
2501 knew
.device
= pcm
->device
;
2502 knew
.count
= pcm
->streams
[stream
].substream_count
;
2503 knew
.private_value
= private_value
;
2504 info
->kctl
= snd_ctl_new1(&knew
, info
);
2509 info
->kctl
->private_free
= pcm_chmap_ctl_private_free
;
2510 err
= snd_ctl_add(pcm
->card
, info
->kctl
);
2513 pcm
->streams
[stream
].chmap_kctl
= info
->kctl
;
2518 EXPORT_SYMBOL_GPL(snd_pcm_add_chmap_ctls
);