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 <sound/core.h>
27 #include <sound/control.h>
28 #include <sound/info.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/timer.h>
34 * fill ring buffer with silence
35 * runtime->silence_start: starting pointer to silence area
36 * runtime->silence_filled: size filled with silence
37 * runtime->silence_threshold: threshold from application
38 * runtime->silence_size: maximal size from application
40 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
42 void snd_pcm_playback_silence(struct snd_pcm_substream
*substream
, snd_pcm_uframes_t new_hw_ptr
)
44 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
45 snd_pcm_uframes_t frames
, ofs
, transfer
;
47 if (runtime
->silence_size
< runtime
->boundary
) {
48 snd_pcm_sframes_t noise_dist
, n
;
49 if (runtime
->silence_start
!= runtime
->control
->appl_ptr
) {
50 n
= runtime
->control
->appl_ptr
- runtime
->silence_start
;
52 n
+= runtime
->boundary
;
53 if ((snd_pcm_uframes_t
)n
< runtime
->silence_filled
)
54 runtime
->silence_filled
-= n
;
56 runtime
->silence_filled
= 0;
57 runtime
->silence_start
= runtime
->control
->appl_ptr
;
59 if (runtime
->silence_filled
>= runtime
->buffer_size
)
61 noise_dist
= snd_pcm_playback_hw_avail(runtime
) + runtime
->silence_filled
;
62 if (noise_dist
>= (snd_pcm_sframes_t
) runtime
->silence_threshold
)
64 frames
= runtime
->silence_threshold
- noise_dist
;
65 if (frames
> runtime
->silence_size
)
66 frames
= runtime
->silence_size
;
68 if (new_hw_ptr
== ULONG_MAX
) { /* initialization */
69 snd_pcm_sframes_t avail
= snd_pcm_playback_hw_avail(runtime
);
70 if (avail
> runtime
->buffer_size
)
71 avail
= runtime
->buffer_size
;
72 runtime
->silence_filled
= avail
> 0 ? avail
: 0;
73 runtime
->silence_start
= (runtime
->status
->hw_ptr
+
74 runtime
->silence_filled
) %
77 ofs
= runtime
->status
->hw_ptr
;
78 frames
= new_hw_ptr
- ofs
;
79 if ((snd_pcm_sframes_t
)frames
< 0)
80 frames
+= runtime
->boundary
;
81 runtime
->silence_filled
-= frames
;
82 if ((snd_pcm_sframes_t
)runtime
->silence_filled
< 0) {
83 runtime
->silence_filled
= 0;
84 runtime
->silence_start
= new_hw_ptr
;
86 runtime
->silence_start
= ofs
;
89 frames
= runtime
->buffer_size
- runtime
->silence_filled
;
91 if (snd_BUG_ON(frames
> runtime
->buffer_size
))
95 ofs
= runtime
->silence_start
% runtime
->buffer_size
;
97 transfer
= ofs
+ frames
> runtime
->buffer_size
? runtime
->buffer_size
- ofs
: frames
;
98 if (runtime
->access
== SNDRV_PCM_ACCESS_RW_INTERLEAVED
||
99 runtime
->access
== SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
) {
100 if (substream
->ops
->silence
) {
102 err
= substream
->ops
->silence(substream
, -1, ofs
, transfer
);
105 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, ofs
);
106 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
* runtime
->channels
);
110 unsigned int channels
= runtime
->channels
;
111 if (substream
->ops
->silence
) {
112 for (c
= 0; c
< channels
; ++c
) {
114 err
= substream
->ops
->silence(substream
, c
, ofs
, transfer
);
118 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
119 for (c
= 0; c
< channels
; ++c
) {
120 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, ofs
);
121 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
);
125 runtime
->silence_filled
+= transfer
;
131 static void pcm_debug_name(struct snd_pcm_substream
*substream
,
132 char *name
, size_t len
)
134 snprintf(name
, len
, "pcmC%dD%d%c:%d",
135 substream
->pcm
->card
->number
,
136 substream
->pcm
->device
,
137 substream
->stream
? 'c' : 'p',
141 #define XRUN_DEBUG_BASIC (1<<0)
142 #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
143 #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
144 #define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
145 #define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
146 #define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
147 #define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
149 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
151 #define xrun_debug(substream, mask) \
152 ((substream)->pstr->xrun_debug & (mask))
154 #define xrun_debug(substream, mask) 0
157 #define dump_stack_on_xrun(substream) do { \
158 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
162 static void xrun(struct snd_pcm_substream
*substream
)
164 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
166 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
167 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
168 snd_pcm_stop(substream
, SNDRV_PCM_STATE_XRUN
);
169 if (xrun_debug(substream
, XRUN_DEBUG_BASIC
)) {
171 pcm_debug_name(substream
, name
, sizeof(name
));
172 snd_printd(KERN_DEBUG
"XRUN: %s\n", name
);
173 dump_stack_on_xrun(substream
);
177 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
178 #define hw_ptr_error(substream, fmt, args...) \
180 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
181 xrun_log_show(substream); \
182 if (printk_ratelimit()) { \
183 snd_printd("PCM: " fmt, ##args); \
185 dump_stack_on_xrun(substream); \
189 #define XRUN_LOG_CNT 10
191 struct hwptr_log_entry
{
192 unsigned long jiffies
;
193 snd_pcm_uframes_t pos
;
194 snd_pcm_uframes_t period_size
;
195 snd_pcm_uframes_t buffer_size
;
196 snd_pcm_uframes_t old_hw_ptr
;
197 snd_pcm_uframes_t hw_ptr_base
;
200 struct snd_pcm_hwptr_log
{
203 struct hwptr_log_entry entries
[XRUN_LOG_CNT
];
206 static void xrun_log(struct snd_pcm_substream
*substream
,
207 snd_pcm_uframes_t pos
)
209 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
210 struct snd_pcm_hwptr_log
*log
= runtime
->hwptr_log
;
211 struct hwptr_log_entry
*entry
;
214 log
= kzalloc(sizeof(*log
), GFP_ATOMIC
);
217 runtime
->hwptr_log
= log
;
219 if (xrun_debug(substream
, XRUN_DEBUG_LOGONCE
) && log
->hit
)
222 entry
= &log
->entries
[log
->idx
];
223 entry
->jiffies
= jiffies
;
225 entry
->period_size
= runtime
->period_size
;
226 entry
->buffer_size
= runtime
->buffer_size
;
227 entry
->old_hw_ptr
= runtime
->status
->hw_ptr
;
228 entry
->hw_ptr_base
= runtime
->hw_ptr_base
;
229 log
->idx
= (log
->idx
+ 1) % XRUN_LOG_CNT
;
232 static void xrun_log_show(struct snd_pcm_substream
*substream
)
234 struct snd_pcm_hwptr_log
*log
= substream
->runtime
->hwptr_log
;
235 struct hwptr_log_entry
*entry
;
242 if (xrun_debug(substream
, XRUN_DEBUG_LOGONCE
) && log
->hit
)
244 pcm_debug_name(substream
, name
, sizeof(name
));
245 for (cnt
= 0, idx
= log
->idx
; cnt
< XRUN_LOG_CNT
; cnt
++) {
246 entry
= &log
->entries
[idx
];
247 if (entry
->period_size
== 0)
249 snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
251 name
, entry
->jiffies
, (unsigned long)entry
->pos
,
252 (unsigned long)entry
->period_size
,
253 (unsigned long)entry
->buffer_size
,
254 (unsigned long)entry
->old_hw_ptr
,
255 (unsigned long)entry
->hw_ptr_base
);
262 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
264 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
265 #define xrun_log(substream, pos) do { } while (0)
266 #define xrun_log_show(substream) do { } while (0)
270 int snd_pcm_update_state(struct snd_pcm_substream
*substream
,
271 struct snd_pcm_runtime
*runtime
)
273 snd_pcm_uframes_t avail
;
275 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
276 avail
= snd_pcm_playback_avail(runtime
);
278 avail
= snd_pcm_capture_avail(runtime
);
279 if (avail
> runtime
->avail_max
)
280 runtime
->avail_max
= avail
;
281 if (runtime
->status
->state
== SNDRV_PCM_STATE_DRAINING
) {
282 if (avail
>= runtime
->buffer_size
) {
283 snd_pcm_drain_done(substream
);
287 if (avail
>= runtime
->stop_threshold
) {
292 if (runtime
->twake
) {
293 if (avail
>= runtime
->twake
)
294 wake_up(&runtime
->tsleep
);
295 } else if (avail
>= runtime
->control
->avail_min
)
296 wake_up(&runtime
->sleep
);
300 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream
*substream
,
301 unsigned int in_interrupt
)
303 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
304 snd_pcm_uframes_t pos
;
305 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
, hw_base
;
306 snd_pcm_sframes_t hdelta
, delta
;
307 unsigned long jdelta
;
309 old_hw_ptr
= runtime
->status
->hw_ptr
;
310 pos
= substream
->ops
->pointer(substream
);
311 if (pos
== SNDRV_PCM_POS_XRUN
) {
315 if (pos
>= runtime
->buffer_size
) {
316 if (printk_ratelimit()) {
318 pcm_debug_name(substream
, name
, sizeof(name
));
319 xrun_log_show(substream
);
320 snd_printd(KERN_ERR
"BUG: %s, pos = %ld, "
321 "buffer size = %ld, period size = %ld\n",
322 name
, pos
, runtime
->buffer_size
,
323 runtime
->period_size
);
327 pos
-= pos
% runtime
->min_align
;
328 if (xrun_debug(substream
, XRUN_DEBUG_LOG
))
329 xrun_log(substream
, pos
);
330 hw_base
= runtime
->hw_ptr_base
;
331 new_hw_ptr
= hw_base
+ pos
;
333 /* we know that one period was processed */
334 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
335 delta
= runtime
->hw_ptr_interrupt
+ runtime
->period_size
;
336 if (delta
> new_hw_ptr
) {
337 /* check for double acknowledged interrupts */
338 hdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
339 if (hdelta
> runtime
->hw_ptr_buffer_jiffies
/2) {
340 hw_base
+= runtime
->buffer_size
;
341 if (hw_base
>= runtime
->boundary
)
343 new_hw_ptr
= hw_base
+ pos
;
348 /* new_hw_ptr might be lower than old_hw_ptr in case when */
349 /* pointer crosses the end of the ring buffer */
350 if (new_hw_ptr
< old_hw_ptr
) {
351 hw_base
+= runtime
->buffer_size
;
352 if (hw_base
>= runtime
->boundary
)
354 new_hw_ptr
= hw_base
+ pos
;
357 delta
= new_hw_ptr
- old_hw_ptr
;
359 delta
+= runtime
->boundary
;
360 if (xrun_debug(substream
, in_interrupt
?
361 XRUN_DEBUG_PERIODUPDATE
: XRUN_DEBUG_HWPTRUPDATE
)) {
363 pcm_debug_name(substream
, name
, sizeof(name
));
364 snd_printd("%s_update: %s: pos=%u/%u/%u, "
365 "hwptr=%ld/%ld/%ld/%ld\n",
366 in_interrupt
? "period" : "hwptr",
369 (unsigned int)runtime
->period_size
,
370 (unsigned int)runtime
->buffer_size
,
371 (unsigned long)delta
,
372 (unsigned long)old_hw_ptr
,
373 (unsigned long)new_hw_ptr
,
374 (unsigned long)runtime
->hw_ptr_base
);
377 if (runtime
->no_period_wakeup
) {
379 * Without regular period interrupts, we have to check
380 * the elapsed time to detect xruns.
382 jdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
383 if (jdelta
< runtime
->hw_ptr_buffer_jiffies
/ 2)
385 hdelta
= jdelta
- delta
* HZ
/ runtime
->rate
;
386 while (hdelta
> runtime
->hw_ptr_buffer_jiffies
/ 2 + 1) {
387 delta
+= runtime
->buffer_size
;
388 hw_base
+= runtime
->buffer_size
;
389 if (hw_base
>= runtime
->boundary
)
391 new_hw_ptr
= hw_base
+ pos
;
392 hdelta
-= runtime
->hw_ptr_buffer_jiffies
;
397 /* something must be really wrong */
398 if (delta
>= runtime
->buffer_size
+ runtime
->period_size
) {
399 hw_ptr_error(substream
,
400 "Unexpected hw_pointer value %s"
401 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
403 in_interrupt
? "[Q] " : "[P]",
404 substream
->stream
, (long)pos
,
405 (long)new_hw_ptr
, (long)old_hw_ptr
);
409 /* Do jiffies check only in xrun_debug mode */
410 if (!xrun_debug(substream
, XRUN_DEBUG_JIFFIESCHECK
))
411 goto no_jiffies_check
;
413 /* Skip the jiffies check for hardwares with BATCH flag.
414 * Such hardware usually just increases the position at each IRQ,
415 * thus it can't give any strange position.
417 if (runtime
->hw
.info
& SNDRV_PCM_INFO_BATCH
)
418 goto no_jiffies_check
;
420 if (hdelta
< runtime
->delay
)
421 goto no_jiffies_check
;
422 hdelta
-= runtime
->delay
;
423 jdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
424 if (((hdelta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
426 (((runtime
->period_size
* HZ
) / runtime
->rate
)
428 /* move new_hw_ptr according jiffies not pos variable */
429 new_hw_ptr
= old_hw_ptr
;
431 /* use loop to avoid checks for delta overflows */
432 /* the delta value is small or zero in most cases */
434 new_hw_ptr
+= runtime
->period_size
;
435 if (new_hw_ptr
>= runtime
->boundary
)
436 new_hw_ptr
-= runtime
->boundary
;
439 /* align hw_base to buffer_size */
440 hw_ptr_error(substream
,
441 "hw_ptr skipping! %s"
442 "(pos=%ld, delta=%ld, period=%ld, "
443 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
444 in_interrupt
? "[Q] " : "",
445 (long)pos
, (long)hdelta
,
446 (long)runtime
->period_size
, jdelta
,
447 ((hdelta
* HZ
) / runtime
->rate
), hw_base
,
448 (unsigned long)old_hw_ptr
,
449 (unsigned long)new_hw_ptr
);
450 /* reset values to proper state */
452 hw_base
= new_hw_ptr
- (new_hw_ptr
% runtime
->buffer_size
);
455 if (delta
> runtime
->period_size
+ runtime
->period_size
/ 2) {
456 hw_ptr_error(substream
,
457 "Lost interrupts? %s"
458 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
460 in_interrupt
? "[Q] " : "",
461 substream
->stream
, (long)delta
,
467 if (runtime
->status
->hw_ptr
== new_hw_ptr
)
470 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
471 runtime
->silence_size
> 0)
472 snd_pcm_playback_silence(substream
, new_hw_ptr
);
475 delta
= new_hw_ptr
- runtime
->hw_ptr_interrupt
;
477 delta
+= runtime
->boundary
;
478 delta
-= (snd_pcm_uframes_t
)delta
% runtime
->period_size
;
479 runtime
->hw_ptr_interrupt
+= delta
;
480 if (runtime
->hw_ptr_interrupt
>= runtime
->boundary
)
481 runtime
->hw_ptr_interrupt
-= runtime
->boundary
;
483 runtime
->hw_ptr_base
= hw_base
;
484 runtime
->status
->hw_ptr
= new_hw_ptr
;
485 runtime
->hw_ptr_jiffies
= jiffies
;
486 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
487 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
489 return snd_pcm_update_state(substream
, runtime
);
492 /* CAUTION: call it with irq disabled */
493 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
)
495 return snd_pcm_update_hw_ptr0(substream
, 0);
499 * snd_pcm_set_ops - set the PCM operators
500 * @pcm: the pcm instance
501 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
502 * @ops: the operator table
504 * Sets the given PCM operators to the pcm instance.
506 void snd_pcm_set_ops(struct snd_pcm
*pcm
, int direction
, struct snd_pcm_ops
*ops
)
508 struct snd_pcm_str
*stream
= &pcm
->streams
[direction
];
509 struct snd_pcm_substream
*substream
;
511 for (substream
= stream
->substream
; substream
!= NULL
; substream
= substream
->next
)
512 substream
->ops
= ops
;
515 EXPORT_SYMBOL(snd_pcm_set_ops
);
518 * snd_pcm_sync - set the PCM sync id
519 * @substream: the pcm substream
521 * Sets the PCM sync identifier for the card.
523 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
)
525 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
527 runtime
->sync
.id32
[0] = substream
->pcm
->card
->number
;
528 runtime
->sync
.id32
[1] = -1;
529 runtime
->sync
.id32
[2] = -1;
530 runtime
->sync
.id32
[3] = -1;
533 EXPORT_SYMBOL(snd_pcm_set_sync
);
536 * Standard ioctl routine
539 static inline unsigned int div32(unsigned int a
, unsigned int b
,
550 static inline unsigned int div_down(unsigned int a
, unsigned int b
)
557 static inline unsigned int div_up(unsigned int a
, unsigned int b
)
569 static inline unsigned int mul(unsigned int a
, unsigned int b
)
573 if (div_down(UINT_MAX
, a
) < b
)
578 static inline unsigned int muldiv32(unsigned int a
, unsigned int b
,
579 unsigned int c
, unsigned int *r
)
581 u_int64_t n
= (u_int64_t
) a
* b
;
587 n
= div_u64_rem(n
, c
, r
);
596 * snd_interval_refine - refine the interval value of configurator
597 * @i: the interval value to refine
598 * @v: the interval value to refer to
600 * Refines the interval value with the reference value.
601 * The interval is changed to the range satisfying both intervals.
602 * The interval status (min, max, integer, etc.) are evaluated.
604 * Returns non-zero if the value is changed, zero if not changed.
606 int snd_interval_refine(struct snd_interval
*i
, const struct snd_interval
*v
)
609 if (snd_BUG_ON(snd_interval_empty(i
)))
611 if (i
->min
< v
->min
) {
613 i
->openmin
= v
->openmin
;
615 } else if (i
->min
== v
->min
&& !i
->openmin
&& v
->openmin
) {
619 if (i
->max
> v
->max
) {
621 i
->openmax
= v
->openmax
;
623 } else if (i
->max
== v
->max
&& !i
->openmax
&& v
->openmax
) {
627 if (!i
->integer
&& v
->integer
) {
640 } else if (!i
->openmin
&& !i
->openmax
&& i
->min
== i
->max
)
642 if (snd_interval_checkempty(i
)) {
643 snd_interval_none(i
);
649 EXPORT_SYMBOL(snd_interval_refine
);
651 static int snd_interval_refine_first(struct snd_interval
*i
)
653 if (snd_BUG_ON(snd_interval_empty(i
)))
655 if (snd_interval_single(i
))
658 i
->openmax
= i
->openmin
;
664 static int snd_interval_refine_last(struct snd_interval
*i
)
666 if (snd_BUG_ON(snd_interval_empty(i
)))
668 if (snd_interval_single(i
))
671 i
->openmin
= i
->openmax
;
677 void snd_interval_mul(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
679 if (a
->empty
|| b
->empty
) {
680 snd_interval_none(c
);
684 c
->min
= mul(a
->min
, b
->min
);
685 c
->openmin
= (a
->openmin
|| b
->openmin
);
686 c
->max
= mul(a
->max
, b
->max
);
687 c
->openmax
= (a
->openmax
|| b
->openmax
);
688 c
->integer
= (a
->integer
&& b
->integer
);
692 * snd_interval_div - refine the interval value with division
699 * Returns non-zero if the value is changed, zero if not changed.
701 void snd_interval_div(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
704 if (a
->empty
|| b
->empty
) {
705 snd_interval_none(c
);
709 c
->min
= div32(a
->min
, b
->max
, &r
);
710 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
712 c
->max
= div32(a
->max
, b
->min
, &r
);
717 c
->openmax
= (a
->openmax
|| b
->openmin
);
726 * snd_interval_muldivk - refine the interval value
729 * @k: divisor (as integer)
734 * Returns non-zero if the value is changed, zero if not changed.
736 void snd_interval_muldivk(const struct snd_interval
*a
, const struct snd_interval
*b
,
737 unsigned int k
, struct snd_interval
*c
)
740 if (a
->empty
|| b
->empty
) {
741 snd_interval_none(c
);
745 c
->min
= muldiv32(a
->min
, b
->min
, k
, &r
);
746 c
->openmin
= (r
|| a
->openmin
|| b
->openmin
);
747 c
->max
= muldiv32(a
->max
, b
->max
, k
, &r
);
752 c
->openmax
= (a
->openmax
|| b
->openmax
);
757 * snd_interval_mulkdiv - refine the interval value
759 * @k: dividend 2 (as integer)
765 * Returns non-zero if the value is changed, zero if not changed.
767 void snd_interval_mulkdiv(const struct snd_interval
*a
, unsigned int k
,
768 const struct snd_interval
*b
, struct snd_interval
*c
)
771 if (a
->empty
|| b
->empty
) {
772 snd_interval_none(c
);
776 c
->min
= muldiv32(a
->min
, k
, b
->max
, &r
);
777 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
779 c
->max
= muldiv32(a
->max
, k
, b
->min
, &r
);
784 c
->openmax
= (a
->openmax
|| b
->openmin
);
796 * snd_interval_ratnum - refine the interval value
797 * @i: interval to refine
798 * @rats_count: number of ratnum_t
799 * @rats: ratnum_t array
800 * @nump: pointer to store the resultant numerator
801 * @denp: pointer to store the resultant denominator
803 * Returns non-zero if the value is changed, zero if not changed.
805 int snd_interval_ratnum(struct snd_interval
*i
,
806 unsigned int rats_count
, struct snd_ratnum
*rats
,
807 unsigned int *nump
, unsigned int *denp
)
809 unsigned int best_num
, best_den
;
812 struct snd_interval t
;
814 unsigned int result_num
, result_den
;
817 best_num
= best_den
= best_diff
= 0;
818 for (k
= 0; k
< rats_count
; ++k
) {
819 unsigned int num
= rats
[k
].num
;
821 unsigned int q
= i
->min
;
825 den
= div_up(num
, q
);
826 if (den
< rats
[k
].den_min
)
828 if (den
> rats
[k
].den_max
)
829 den
= rats
[k
].den_max
;
832 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
836 diff
= num
- q
* den
;
840 diff
* best_den
< best_diff
* den
) {
850 t
.min
= div_down(best_num
, best_den
);
851 t
.openmin
= !!(best_num
% best_den
);
853 result_num
= best_num
;
854 result_diff
= best_diff
;
855 result_den
= best_den
;
856 best_num
= best_den
= best_diff
= 0;
857 for (k
= 0; k
< rats_count
; ++k
) {
858 unsigned int num
= rats
[k
].num
;
860 unsigned int q
= i
->max
;
866 den
= div_down(num
, q
);
867 if (den
> rats
[k
].den_max
)
869 if (den
< rats
[k
].den_min
)
870 den
= rats
[k
].den_min
;
873 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
875 den
+= rats
[k
].den_step
- r
;
877 diff
= q
* den
- num
;
881 diff
* best_den
< best_diff
* den
) {
891 t
.max
= div_up(best_num
, best_den
);
892 t
.openmax
= !!(best_num
% best_den
);
894 err
= snd_interval_refine(i
, &t
);
898 if (snd_interval_single(i
)) {
899 if (best_diff
* result_den
< result_diff
* best_den
) {
900 result_num
= best_num
;
901 result_den
= best_den
;
911 EXPORT_SYMBOL(snd_interval_ratnum
);
914 * snd_interval_ratden - refine the interval value
915 * @i: interval to refine
916 * @rats_count: number of struct ratden
917 * @rats: struct ratden array
918 * @nump: pointer to store the resultant numerator
919 * @denp: pointer to store the resultant denominator
921 * Returns non-zero if the value is changed, zero if not changed.
923 static int snd_interval_ratden(struct snd_interval
*i
,
924 unsigned int rats_count
, struct snd_ratden
*rats
,
925 unsigned int *nump
, unsigned int *denp
)
927 unsigned int best_num
, best_diff
, best_den
;
929 struct snd_interval t
;
932 best_num
= best_den
= best_diff
= 0;
933 for (k
= 0; k
< rats_count
; ++k
) {
935 unsigned int den
= rats
[k
].den
;
936 unsigned int q
= i
->min
;
939 if (num
> rats
[k
].num_max
)
941 if (num
< rats
[k
].num_min
)
942 num
= rats
[k
].num_max
;
945 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
947 num
+= rats
[k
].num_step
- r
;
949 diff
= num
- q
* den
;
951 diff
* best_den
< best_diff
* den
) {
961 t
.min
= div_down(best_num
, best_den
);
962 t
.openmin
= !!(best_num
% best_den
);
964 best_num
= best_den
= best_diff
= 0;
965 for (k
= 0; k
< rats_count
; ++k
) {
967 unsigned int den
= rats
[k
].den
;
968 unsigned int q
= i
->max
;
971 if (num
< rats
[k
].num_min
)
973 if (num
> rats
[k
].num_max
)
974 num
= rats
[k
].num_max
;
977 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
981 diff
= q
* den
- num
;
983 diff
* best_den
< best_diff
* den
) {
993 t
.max
= div_up(best_num
, best_den
);
994 t
.openmax
= !!(best_num
% best_den
);
996 err
= snd_interval_refine(i
, &t
);
1000 if (snd_interval_single(i
)) {
1010 * snd_interval_list - refine the interval value from the list
1011 * @i: the interval value to refine
1012 * @count: the number of elements in the list
1013 * @list: the value list
1014 * @mask: the bit-mask to evaluate
1016 * Refines the interval value from the list.
1017 * When mask is non-zero, only the elements corresponding to bit 1 are
1020 * Returns non-zero if the value is changed, zero if not changed.
1022 int snd_interval_list(struct snd_interval
*i
, unsigned int count
, unsigned int *list
, unsigned int mask
)
1025 struct snd_interval list_range
;
1031 snd_interval_any(&list_range
);
1032 list_range
.min
= UINT_MAX
;
1034 for (k
= 0; k
< count
; k
++) {
1035 if (mask
&& !(mask
& (1 << k
)))
1037 if (!snd_interval_test(i
, list
[k
]))
1039 list_range
.min
= min(list_range
.min
, list
[k
]);
1040 list_range
.max
= max(list_range
.max
, list
[k
]);
1042 return snd_interval_refine(i
, &list_range
);
1045 EXPORT_SYMBOL(snd_interval_list
);
1047 static int snd_interval_step(struct snd_interval
*i
, unsigned int min
, unsigned int step
)
1051 n
= (i
->min
- min
) % step
;
1052 if (n
!= 0 || i
->openmin
) {
1056 n
= (i
->max
- min
) % step
;
1057 if (n
!= 0 || i
->openmax
) {
1061 if (snd_interval_checkempty(i
)) {
1068 /* Info constraints helpers */
1071 * snd_pcm_hw_rule_add - add the hw-constraint rule
1072 * @runtime: the pcm runtime instance
1073 * @cond: condition bits
1074 * @var: the variable to evaluate
1075 * @func: the evaluation function
1076 * @private: the private data pointer passed to function
1077 * @dep: the dependent variables
1079 * Returns zero if successful, or a negative error code on failure.
1081 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
, unsigned int cond
,
1083 snd_pcm_hw_rule_func_t func
, void *private,
1086 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1087 struct snd_pcm_hw_rule
*c
;
1090 va_start(args
, dep
);
1091 if (constrs
->rules_num
>= constrs
->rules_all
) {
1092 struct snd_pcm_hw_rule
*new;
1093 unsigned int new_rules
= constrs
->rules_all
+ 16;
1094 new = kcalloc(new_rules
, sizeof(*c
), GFP_KERNEL
);
1099 if (constrs
->rules
) {
1100 memcpy(new, constrs
->rules
,
1101 constrs
->rules_num
* sizeof(*c
));
1102 kfree(constrs
->rules
);
1104 constrs
->rules
= new;
1105 constrs
->rules_all
= new_rules
;
1107 c
= &constrs
->rules
[constrs
->rules_num
];
1111 c
->private = private;
1114 if (snd_BUG_ON(k
>= ARRAY_SIZE(c
->deps
))) {
1121 dep
= va_arg(args
, int);
1123 constrs
->rules_num
++;
1128 EXPORT_SYMBOL(snd_pcm_hw_rule_add
);
1131 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1132 * @runtime: PCM runtime instance
1133 * @var: hw_params variable to apply the mask
1134 * @mask: the bitmap mask
1136 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1138 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1141 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1142 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1143 *maskp
->bits
&= mask
;
1144 memset(maskp
->bits
+ 1, 0, (SNDRV_MASK_MAX
-32) / 8); /* clear rest */
1145 if (*maskp
->bits
== 0)
1151 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1152 * @runtime: PCM runtime instance
1153 * @var: hw_params variable to apply the mask
1154 * @mask: the 64bit bitmap mask
1156 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1158 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1161 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1162 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1163 maskp
->bits
[0] &= (u_int32_t
)mask
;
1164 maskp
->bits
[1] &= (u_int32_t
)(mask
>> 32);
1165 memset(maskp
->bits
+ 2, 0, (SNDRV_MASK_MAX
-64) / 8); /* clear rest */
1166 if (! maskp
->bits
[0] && ! maskp
->bits
[1])
1172 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1173 * @runtime: PCM runtime instance
1174 * @var: hw_params variable to apply the integer constraint
1176 * Apply the constraint of integer to an interval parameter.
1178 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
)
1180 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1181 return snd_interval_setinteger(constrs_interval(constrs
, var
));
1184 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer
);
1187 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1188 * @runtime: PCM runtime instance
1189 * @var: hw_params variable to apply the range
1190 * @min: the minimal value
1191 * @max: the maximal value
1193 * Apply the min/max range constraint to an interval parameter.
1195 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1196 unsigned int min
, unsigned int max
)
1198 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1199 struct snd_interval t
;
1202 t
.openmin
= t
.openmax
= 0;
1204 return snd_interval_refine(constrs_interval(constrs
, var
), &t
);
1207 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax
);
1209 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params
*params
,
1210 struct snd_pcm_hw_rule
*rule
)
1212 struct snd_pcm_hw_constraint_list
*list
= rule
->private;
1213 return snd_interval_list(hw_param_interval(params
, rule
->var
), list
->count
, list
->list
, list
->mask
);
1218 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1219 * @runtime: PCM runtime instance
1220 * @cond: condition bits
1221 * @var: hw_params variable to apply the list constraint
1224 * Apply the list of constraints to an interval parameter.
1226 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
1228 snd_pcm_hw_param_t var
,
1229 struct snd_pcm_hw_constraint_list
*l
)
1231 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1232 snd_pcm_hw_rule_list
, l
,
1236 EXPORT_SYMBOL(snd_pcm_hw_constraint_list
);
1238 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params
*params
,
1239 struct snd_pcm_hw_rule
*rule
)
1241 struct snd_pcm_hw_constraint_ratnums
*r
= rule
->private;
1242 unsigned int num
= 0, den
= 0;
1244 err
= snd_interval_ratnum(hw_param_interval(params
, rule
->var
),
1245 r
->nrats
, r
->rats
, &num
, &den
);
1246 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1247 params
->rate_num
= num
;
1248 params
->rate_den
= den
;
1254 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1255 * @runtime: PCM runtime instance
1256 * @cond: condition bits
1257 * @var: hw_params variable to apply the ratnums constraint
1258 * @r: struct snd_ratnums constriants
1260 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
1262 snd_pcm_hw_param_t var
,
1263 struct snd_pcm_hw_constraint_ratnums
*r
)
1265 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1266 snd_pcm_hw_rule_ratnums
, r
,
1270 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums
);
1272 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params
*params
,
1273 struct snd_pcm_hw_rule
*rule
)
1275 struct snd_pcm_hw_constraint_ratdens
*r
= rule
->private;
1276 unsigned int num
= 0, den
= 0;
1277 int err
= snd_interval_ratden(hw_param_interval(params
, rule
->var
),
1278 r
->nrats
, r
->rats
, &num
, &den
);
1279 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1280 params
->rate_num
= num
;
1281 params
->rate_den
= den
;
1287 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1288 * @runtime: PCM runtime instance
1289 * @cond: condition bits
1290 * @var: hw_params variable to apply the ratdens constraint
1291 * @r: struct snd_ratdens constriants
1293 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
1295 snd_pcm_hw_param_t var
,
1296 struct snd_pcm_hw_constraint_ratdens
*r
)
1298 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1299 snd_pcm_hw_rule_ratdens
, r
,
1303 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens
);
1305 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params
*params
,
1306 struct snd_pcm_hw_rule
*rule
)
1308 unsigned int l
= (unsigned long) rule
->private;
1309 int width
= l
& 0xffff;
1310 unsigned int msbits
= l
>> 16;
1311 struct snd_interval
*i
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_SAMPLE_BITS
);
1312 if (snd_interval_single(i
) && snd_interval_value(i
) == width
)
1313 params
->msbits
= msbits
;
1318 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1319 * @runtime: PCM runtime instance
1320 * @cond: condition bits
1321 * @width: sample bits width
1322 * @msbits: msbits width
1324 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
1327 unsigned int msbits
)
1329 unsigned long l
= (msbits
<< 16) | width
;
1330 return snd_pcm_hw_rule_add(runtime
, cond
, -1,
1331 snd_pcm_hw_rule_msbits
,
1333 SNDRV_PCM_HW_PARAM_SAMPLE_BITS
, -1);
1336 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits
);
1338 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params
*params
,
1339 struct snd_pcm_hw_rule
*rule
)
1341 unsigned long step
= (unsigned long) rule
->private;
1342 return snd_interval_step(hw_param_interval(params
, rule
->var
), 0, step
);
1346 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1347 * @runtime: PCM runtime instance
1348 * @cond: condition bits
1349 * @var: hw_params variable to apply the step constraint
1352 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
1354 snd_pcm_hw_param_t var
,
1357 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1358 snd_pcm_hw_rule_step
, (void *) step
,
1362 EXPORT_SYMBOL(snd_pcm_hw_constraint_step
);
1364 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params
*params
, struct snd_pcm_hw_rule
*rule
)
1366 static unsigned int pow2_sizes
[] = {
1367 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1368 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1369 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1370 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1372 return snd_interval_list(hw_param_interval(params
, rule
->var
),
1373 ARRAY_SIZE(pow2_sizes
), pow2_sizes
, 0);
1377 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1378 * @runtime: PCM runtime instance
1379 * @cond: condition bits
1380 * @var: hw_params variable to apply the power-of-2 constraint
1382 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
1384 snd_pcm_hw_param_t var
)
1386 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1387 snd_pcm_hw_rule_pow2
, NULL
,
1391 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2
);
1393 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params
*params
,
1394 snd_pcm_hw_param_t var
)
1396 if (hw_is_mask(var
)) {
1397 snd_mask_any(hw_param_mask(params
, var
));
1398 params
->cmask
|= 1 << var
;
1399 params
->rmask
|= 1 << var
;
1402 if (hw_is_interval(var
)) {
1403 snd_interval_any(hw_param_interval(params
, var
));
1404 params
->cmask
|= 1 << var
;
1405 params
->rmask
|= 1 << var
;
1411 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
)
1414 memset(params
, 0, sizeof(*params
));
1415 for (k
= SNDRV_PCM_HW_PARAM_FIRST_MASK
; k
<= SNDRV_PCM_HW_PARAM_LAST_MASK
; k
++)
1416 _snd_pcm_hw_param_any(params
, k
);
1417 for (k
= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
; k
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
; k
++)
1418 _snd_pcm_hw_param_any(params
, k
);
1422 EXPORT_SYMBOL(_snd_pcm_hw_params_any
);
1425 * snd_pcm_hw_param_value - return @params field @var value
1426 * @params: the hw_params instance
1427 * @var: parameter to retrieve
1428 * @dir: pointer to the direction (-1,0,1) or %NULL
1430 * Return the value for field @var if it's fixed in configuration space
1431 * defined by @params. Return -%EINVAL otherwise.
1433 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
1434 snd_pcm_hw_param_t var
, int *dir
)
1436 if (hw_is_mask(var
)) {
1437 const struct snd_mask
*mask
= hw_param_mask_c(params
, var
);
1438 if (!snd_mask_single(mask
))
1442 return snd_mask_value(mask
);
1444 if (hw_is_interval(var
)) {
1445 const struct snd_interval
*i
= hw_param_interval_c(params
, var
);
1446 if (!snd_interval_single(i
))
1450 return snd_interval_value(i
);
1455 EXPORT_SYMBOL(snd_pcm_hw_param_value
);
1457 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
,
1458 snd_pcm_hw_param_t var
)
1460 if (hw_is_mask(var
)) {
1461 snd_mask_none(hw_param_mask(params
, var
));
1462 params
->cmask
|= 1 << var
;
1463 params
->rmask
|= 1 << var
;
1464 } else if (hw_is_interval(var
)) {
1465 snd_interval_none(hw_param_interval(params
, var
));
1466 params
->cmask
|= 1 << var
;
1467 params
->rmask
|= 1 << var
;
1473 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty
);
1475 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params
*params
,
1476 snd_pcm_hw_param_t var
)
1479 if (hw_is_mask(var
))
1480 changed
= snd_mask_refine_first(hw_param_mask(params
, var
));
1481 else if (hw_is_interval(var
))
1482 changed
= snd_interval_refine_first(hw_param_interval(params
, var
));
1486 params
->cmask
|= 1 << var
;
1487 params
->rmask
|= 1 << var
;
1494 * snd_pcm_hw_param_first - refine config space and return minimum value
1495 * @pcm: PCM instance
1496 * @params: the hw_params instance
1497 * @var: parameter to retrieve
1498 * @dir: pointer to the direction (-1,0,1) or %NULL
1500 * Inside configuration space defined by @params remove from @var all
1501 * values > minimum. Reduce configuration space accordingly.
1502 * Return the minimum.
1504 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
1505 struct snd_pcm_hw_params
*params
,
1506 snd_pcm_hw_param_t var
, int *dir
)
1508 int changed
= _snd_pcm_hw_param_first(params
, var
);
1511 if (params
->rmask
) {
1512 int err
= snd_pcm_hw_refine(pcm
, params
);
1513 if (snd_BUG_ON(err
< 0))
1516 return snd_pcm_hw_param_value(params
, var
, dir
);
1519 EXPORT_SYMBOL(snd_pcm_hw_param_first
);
1521 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params
*params
,
1522 snd_pcm_hw_param_t var
)
1525 if (hw_is_mask(var
))
1526 changed
= snd_mask_refine_last(hw_param_mask(params
, var
));
1527 else if (hw_is_interval(var
))
1528 changed
= snd_interval_refine_last(hw_param_interval(params
, var
));
1532 params
->cmask
|= 1 << var
;
1533 params
->rmask
|= 1 << var
;
1540 * snd_pcm_hw_param_last - refine config space and return maximum value
1541 * @pcm: PCM instance
1542 * @params: the hw_params instance
1543 * @var: parameter to retrieve
1544 * @dir: pointer to the direction (-1,0,1) or %NULL
1546 * Inside configuration space defined by @params remove from @var all
1547 * values < maximum. Reduce configuration space accordingly.
1548 * Return the maximum.
1550 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
1551 struct snd_pcm_hw_params
*params
,
1552 snd_pcm_hw_param_t var
, int *dir
)
1554 int changed
= _snd_pcm_hw_param_last(params
, var
);
1557 if (params
->rmask
) {
1558 int err
= snd_pcm_hw_refine(pcm
, params
);
1559 if (snd_BUG_ON(err
< 0))
1562 return snd_pcm_hw_param_value(params
, var
, dir
);
1565 EXPORT_SYMBOL(snd_pcm_hw_param_last
);
1568 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1569 * @pcm: PCM instance
1570 * @params: the hw_params instance
1572 * Choose one configuration from configuration space defined by @params.
1573 * The configuration chosen is that obtained fixing in this order:
1574 * first access, first format, first subformat, min channels,
1575 * min rate, min period time, max buffer size, min tick time
1577 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*pcm
,
1578 struct snd_pcm_hw_params
*params
)
1580 static int vars
[] = {
1581 SNDRV_PCM_HW_PARAM_ACCESS
,
1582 SNDRV_PCM_HW_PARAM_FORMAT
,
1583 SNDRV_PCM_HW_PARAM_SUBFORMAT
,
1584 SNDRV_PCM_HW_PARAM_CHANNELS
,
1585 SNDRV_PCM_HW_PARAM_RATE
,
1586 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1587 SNDRV_PCM_HW_PARAM_BUFFER_SIZE
,
1588 SNDRV_PCM_HW_PARAM_TICK_TIME
,
1593 for (v
= vars
; *v
!= -1; v
++) {
1594 if (*v
!= SNDRV_PCM_HW_PARAM_BUFFER_SIZE
)
1595 err
= snd_pcm_hw_param_first(pcm
, params
, *v
, NULL
);
1597 err
= snd_pcm_hw_param_last(pcm
, params
, *v
, NULL
);
1598 if (snd_BUG_ON(err
< 0))
1604 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream
*substream
,
1607 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1608 unsigned long flags
;
1609 snd_pcm_stream_lock_irqsave(substream
, flags
);
1610 if (snd_pcm_running(substream
) &&
1611 snd_pcm_update_hw_ptr(substream
) >= 0)
1612 runtime
->status
->hw_ptr
%= runtime
->buffer_size
;
1614 runtime
->status
->hw_ptr
= 0;
1615 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1619 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream
*substream
,
1622 struct snd_pcm_channel_info
*info
= arg
;
1623 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1625 if (!(runtime
->info
& SNDRV_PCM_INFO_MMAP
)) {
1629 width
= snd_pcm_format_physical_width(runtime
->format
);
1633 switch (runtime
->access
) {
1634 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
:
1635 case SNDRV_PCM_ACCESS_RW_INTERLEAVED
:
1636 info
->first
= info
->channel
* width
;
1637 info
->step
= runtime
->channels
* width
;
1639 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED
:
1640 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
:
1642 size_t size
= runtime
->dma_bytes
/ runtime
->channels
;
1643 info
->first
= info
->channel
* size
* 8;
1654 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream
*substream
,
1657 struct snd_pcm_hw_params
*params
= arg
;
1658 snd_pcm_format_t format
;
1659 int channels
, width
;
1661 params
->fifo_size
= substream
->runtime
->hw
.fifo_size
;
1662 if (!(substream
->runtime
->hw
.info
& SNDRV_PCM_INFO_FIFO_IN_FRAMES
)) {
1663 format
= params_format(params
);
1664 channels
= params_channels(params
);
1665 width
= snd_pcm_format_physical_width(format
);
1666 params
->fifo_size
/= width
* channels
;
1672 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1673 * @substream: the pcm substream instance
1674 * @cmd: ioctl command
1675 * @arg: ioctl argument
1677 * Processes the generic ioctl commands for PCM.
1678 * Can be passed as the ioctl callback for PCM ops.
1680 * Returns zero if successful, or a negative error code on failure.
1682 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
1683 unsigned int cmd
, void *arg
)
1686 case SNDRV_PCM_IOCTL1_INFO
:
1688 case SNDRV_PCM_IOCTL1_RESET
:
1689 return snd_pcm_lib_ioctl_reset(substream
, arg
);
1690 case SNDRV_PCM_IOCTL1_CHANNEL_INFO
:
1691 return snd_pcm_lib_ioctl_channel_info(substream
, arg
);
1692 case SNDRV_PCM_IOCTL1_FIFO_SIZE
:
1693 return snd_pcm_lib_ioctl_fifo_size(substream
, arg
);
1698 EXPORT_SYMBOL(snd_pcm_lib_ioctl
);
1701 * snd_pcm_period_elapsed - update the pcm status for the next period
1702 * @substream: the pcm substream instance
1704 * This function is called from the interrupt handler when the
1705 * PCM has processed the period size. It will update the current
1706 * pointer, wake up sleepers, etc.
1708 * Even if more than one periods have elapsed since the last call, you
1709 * have to call this only once.
1711 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
)
1713 struct snd_pcm_runtime
*runtime
;
1714 unsigned long flags
;
1716 if (PCM_RUNTIME_CHECK(substream
))
1718 runtime
= substream
->runtime
;
1720 if (runtime
->transfer_ack_begin
)
1721 runtime
->transfer_ack_begin(substream
);
1723 snd_pcm_stream_lock_irqsave(substream
, flags
);
1724 if (!snd_pcm_running(substream
) ||
1725 snd_pcm_update_hw_ptr0(substream
, 1) < 0)
1728 if (substream
->timer_running
)
1729 snd_timer_interrupt(substream
->timer
, 1);
1731 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1732 if (runtime
->transfer_ack_end
)
1733 runtime
->transfer_ack_end(substream
);
1734 kill_fasync(&runtime
->fasync
, SIGIO
, POLL_IN
);
1737 EXPORT_SYMBOL(snd_pcm_period_elapsed
);
1740 * Wait until avail_min data becomes available
1741 * Returns a negative error code if any error occurs during operation.
1742 * The available space is stored on availp. When err = 0 and avail = 0
1743 * on the capture stream, it indicates the stream is in DRAINING state.
1745 static int wait_for_avail(struct snd_pcm_substream
*substream
,
1746 snd_pcm_uframes_t
*availp
)
1748 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1749 int is_playback
= substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
;
1752 snd_pcm_uframes_t avail
= 0;
1755 init_waitqueue_entry(&wait
, current
);
1756 add_wait_queue(&runtime
->tsleep
, &wait
);
1758 if (signal_pending(current
)) {
1762 set_current_state(TASK_INTERRUPTIBLE
);
1763 snd_pcm_stream_unlock_irq(substream
);
1764 tout
= schedule_timeout(msecs_to_jiffies(10000));
1765 snd_pcm_stream_lock_irq(substream
);
1766 switch (runtime
->status
->state
) {
1767 case SNDRV_PCM_STATE_SUSPENDED
:
1770 case SNDRV_PCM_STATE_XRUN
:
1773 case SNDRV_PCM_STATE_DRAINING
:
1777 avail
= 0; /* indicate draining */
1779 case SNDRV_PCM_STATE_OPEN
:
1780 case SNDRV_PCM_STATE_SETUP
:
1781 case SNDRV_PCM_STATE_DISCONNECTED
:
1786 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1787 is_playback
? "playback" : "capture");
1792 avail
= snd_pcm_playback_avail(runtime
);
1794 avail
= snd_pcm_capture_avail(runtime
);
1795 if (avail
>= runtime
->twake
)
1799 remove_wait_queue(&runtime
->tsleep
, &wait
);
1804 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream
*substream
,
1806 unsigned long data
, unsigned int off
,
1807 snd_pcm_uframes_t frames
)
1809 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1811 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1812 if (substream
->ops
->copy
) {
1813 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1816 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1817 if (copy_from_user(hwbuf
, buf
, frames_to_bytes(runtime
, frames
)))
1823 typedef int (*transfer_f
)(struct snd_pcm_substream
*substream
, unsigned int hwoff
,
1824 unsigned long data
, unsigned int off
,
1825 snd_pcm_uframes_t size
);
1827 static snd_pcm_sframes_t
snd_pcm_lib_write1(struct snd_pcm_substream
*substream
,
1829 snd_pcm_uframes_t size
,
1831 transfer_f transfer
)
1833 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1834 snd_pcm_uframes_t xfer
= 0;
1835 snd_pcm_uframes_t offset
= 0;
1841 snd_pcm_stream_lock_irq(substream
);
1842 switch (runtime
->status
->state
) {
1843 case SNDRV_PCM_STATE_PREPARED
:
1844 case SNDRV_PCM_STATE_RUNNING
:
1845 case SNDRV_PCM_STATE_PAUSED
:
1847 case SNDRV_PCM_STATE_XRUN
:
1850 case SNDRV_PCM_STATE_SUSPENDED
:
1858 runtime
->twake
= runtime
->control
->avail_min
? : 1;
1860 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1861 snd_pcm_uframes_t avail
;
1862 snd_pcm_uframes_t cont
;
1863 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1864 snd_pcm_update_hw_ptr(substream
);
1865 avail
= snd_pcm_playback_avail(runtime
);
1871 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
1872 runtime
->control
->avail_min
? : 1);
1873 err
= wait_for_avail(substream
, &avail
);
1877 frames
= size
> avail
? avail
: size
;
1878 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
1881 if (snd_BUG_ON(!frames
)) {
1883 snd_pcm_stream_unlock_irq(substream
);
1886 appl_ptr
= runtime
->control
->appl_ptr
;
1887 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
1888 snd_pcm_stream_unlock_irq(substream
);
1889 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
1890 snd_pcm_stream_lock_irq(substream
);
1893 switch (runtime
->status
->state
) {
1894 case SNDRV_PCM_STATE_XRUN
:
1897 case SNDRV_PCM_STATE_SUSPENDED
:
1904 if (appl_ptr
>= runtime
->boundary
)
1905 appl_ptr
-= runtime
->boundary
;
1906 runtime
->control
->appl_ptr
= appl_ptr
;
1907 if (substream
->ops
->ack
)
1908 substream
->ops
->ack(substream
);
1913 if (runtime
->status
->state
== SNDRV_PCM_STATE_PREPARED
&&
1914 snd_pcm_playback_hw_avail(runtime
) >= (snd_pcm_sframes_t
)runtime
->start_threshold
) {
1915 err
= snd_pcm_start(substream
);
1922 if (xfer
> 0 && err
>= 0)
1923 snd_pcm_update_state(substream
, runtime
);
1924 snd_pcm_stream_unlock_irq(substream
);
1925 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
1928 /* sanity-check for read/write methods */
1929 static int pcm_sanity_check(struct snd_pcm_substream
*substream
)
1931 struct snd_pcm_runtime
*runtime
;
1932 if (PCM_RUNTIME_CHECK(substream
))
1934 runtime
= substream
->runtime
;
1935 if (snd_BUG_ON(!substream
->ops
->copy
&& !runtime
->dma_area
))
1937 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
1942 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
, const void __user
*buf
, snd_pcm_uframes_t size
)
1944 struct snd_pcm_runtime
*runtime
;
1948 err
= pcm_sanity_check(substream
);
1951 runtime
= substream
->runtime
;
1952 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1954 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
&&
1955 runtime
->channels
> 1)
1957 return snd_pcm_lib_write1(substream
, (unsigned long)buf
, size
, nonblock
,
1958 snd_pcm_lib_write_transfer
);
1961 EXPORT_SYMBOL(snd_pcm_lib_write
);
1963 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream
*substream
,
1965 unsigned long data
, unsigned int off
,
1966 snd_pcm_uframes_t frames
)
1968 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1970 void __user
**bufs
= (void __user
**)data
;
1971 int channels
= runtime
->channels
;
1973 if (substream
->ops
->copy
) {
1974 if (snd_BUG_ON(!substream
->ops
->silence
))
1976 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1977 if (*bufs
== NULL
) {
1978 if ((err
= substream
->ops
->silence(substream
, c
, hwoff
, frames
)) < 0)
1981 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1982 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
1987 /* default transfer behaviour */
1988 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
1989 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1990 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
1991 if (*bufs
== NULL
) {
1992 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, frames
);
1994 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1995 if (copy_from_user(hwbuf
, buf
, samples_to_bytes(runtime
, frames
)))
2003 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
2005 snd_pcm_uframes_t frames
)
2007 struct snd_pcm_runtime
*runtime
;
2011 err
= pcm_sanity_check(substream
);
2014 runtime
= substream
->runtime
;
2015 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2017 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2019 return snd_pcm_lib_write1(substream
, (unsigned long)bufs
, frames
,
2020 nonblock
, snd_pcm_lib_writev_transfer
);
2023 EXPORT_SYMBOL(snd_pcm_lib_writev
);
2025 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream
*substream
,
2027 unsigned long data
, unsigned int off
,
2028 snd_pcm_uframes_t frames
)
2030 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2032 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
2033 if (substream
->ops
->copy
) {
2034 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
2037 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
2038 if (copy_to_user(buf
, hwbuf
, frames_to_bytes(runtime
, frames
)))
2044 static snd_pcm_sframes_t
snd_pcm_lib_read1(struct snd_pcm_substream
*substream
,
2046 snd_pcm_uframes_t size
,
2048 transfer_f transfer
)
2050 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2051 snd_pcm_uframes_t xfer
= 0;
2052 snd_pcm_uframes_t offset
= 0;
2058 snd_pcm_stream_lock_irq(substream
);
2059 switch (runtime
->status
->state
) {
2060 case SNDRV_PCM_STATE_PREPARED
:
2061 if (size
>= runtime
->start_threshold
) {
2062 err
= snd_pcm_start(substream
);
2067 case SNDRV_PCM_STATE_DRAINING
:
2068 case SNDRV_PCM_STATE_RUNNING
:
2069 case SNDRV_PCM_STATE_PAUSED
:
2071 case SNDRV_PCM_STATE_XRUN
:
2074 case SNDRV_PCM_STATE_SUSPENDED
:
2082 runtime
->twake
= runtime
->control
->avail_min
? : 1;
2084 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
2085 snd_pcm_uframes_t avail
;
2086 snd_pcm_uframes_t cont
;
2087 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
2088 snd_pcm_update_hw_ptr(substream
);
2089 avail
= snd_pcm_capture_avail(runtime
);
2091 if (runtime
->status
->state
==
2092 SNDRV_PCM_STATE_DRAINING
) {
2093 snd_pcm_stop(substream
, SNDRV_PCM_STATE_SETUP
);
2100 runtime
->twake
= min_t(snd_pcm_uframes_t
, size
,
2101 runtime
->control
->avail_min
? : 1);
2102 err
= wait_for_avail(substream
, &avail
);
2106 continue; /* draining */
2108 frames
= size
> avail
? avail
: size
;
2109 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
2112 if (snd_BUG_ON(!frames
)) {
2114 snd_pcm_stream_unlock_irq(substream
);
2117 appl_ptr
= runtime
->control
->appl_ptr
;
2118 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2119 snd_pcm_stream_unlock_irq(substream
);
2120 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
2121 snd_pcm_stream_lock_irq(substream
);
2124 switch (runtime
->status
->state
) {
2125 case SNDRV_PCM_STATE_XRUN
:
2128 case SNDRV_PCM_STATE_SUSPENDED
:
2135 if (appl_ptr
>= runtime
->boundary
)
2136 appl_ptr
-= runtime
->boundary
;
2137 runtime
->control
->appl_ptr
= appl_ptr
;
2138 if (substream
->ops
->ack
)
2139 substream
->ops
->ack(substream
);
2147 if (xfer
> 0 && err
>= 0)
2148 snd_pcm_update_state(substream
, runtime
);
2149 snd_pcm_stream_unlock_irq(substream
);
2150 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2153 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
, void __user
*buf
, snd_pcm_uframes_t size
)
2155 struct snd_pcm_runtime
*runtime
;
2159 err
= pcm_sanity_check(substream
);
2162 runtime
= substream
->runtime
;
2163 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2164 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
2166 return snd_pcm_lib_read1(substream
, (unsigned long)buf
, size
, nonblock
, snd_pcm_lib_read_transfer
);
2169 EXPORT_SYMBOL(snd_pcm_lib_read
);
2171 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream
*substream
,
2173 unsigned long data
, unsigned int off
,
2174 snd_pcm_uframes_t frames
)
2176 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2178 void __user
**bufs
= (void __user
**)data
;
2179 int channels
= runtime
->channels
;
2181 if (substream
->ops
->copy
) {
2182 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2186 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2187 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2191 snd_pcm_uframes_t dma_csize
= runtime
->dma_bytes
/ channels
;
2192 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2198 hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2199 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2200 if (copy_to_user(buf
, hwbuf
, samples_to_bytes(runtime
, frames
)))
2207 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
2209 snd_pcm_uframes_t frames
)
2211 struct snd_pcm_runtime
*runtime
;
2215 err
= pcm_sanity_check(substream
);
2218 runtime
= substream
->runtime
;
2219 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2222 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2223 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2225 return snd_pcm_lib_read1(substream
, (unsigned long)bufs
, frames
, nonblock
, snd_pcm_lib_readv_transfer
);
2228 EXPORT_SYMBOL(snd_pcm_lib_readv
);