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 runtime
->silence_filled
= avail
> 0 ? avail
: 0;
71 runtime
->silence_start
= (runtime
->status
->hw_ptr
+
72 runtime
->silence_filled
) %
75 ofs
= runtime
->status
->hw_ptr
;
76 frames
= new_hw_ptr
- ofs
;
77 if ((snd_pcm_sframes_t
)frames
< 0)
78 frames
+= runtime
->boundary
;
79 runtime
->silence_filled
-= frames
;
80 if ((snd_pcm_sframes_t
)runtime
->silence_filled
< 0) {
81 runtime
->silence_filled
= 0;
82 runtime
->silence_start
= new_hw_ptr
;
84 runtime
->silence_start
= ofs
;
87 frames
= runtime
->buffer_size
- runtime
->silence_filled
;
89 if (snd_BUG_ON(frames
> runtime
->buffer_size
))
93 ofs
= runtime
->silence_start
% runtime
->buffer_size
;
95 transfer
= ofs
+ frames
> runtime
->buffer_size
? runtime
->buffer_size
- ofs
: frames
;
96 if (runtime
->access
== SNDRV_PCM_ACCESS_RW_INTERLEAVED
||
97 runtime
->access
== SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
) {
98 if (substream
->ops
->silence
) {
100 err
= substream
->ops
->silence(substream
, -1, ofs
, transfer
);
103 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, ofs
);
104 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
* runtime
->channels
);
108 unsigned int channels
= runtime
->channels
;
109 if (substream
->ops
->silence
) {
110 for (c
= 0; c
< channels
; ++c
) {
112 err
= substream
->ops
->silence(substream
, c
, ofs
, transfer
);
116 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
117 for (c
= 0; c
< channels
; ++c
) {
118 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, ofs
);
119 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
);
123 runtime
->silence_filled
+= transfer
;
129 static void pcm_debug_name(struct snd_pcm_substream
*substream
,
130 char *name
, size_t len
)
132 snprintf(name
, len
, "pcmC%dD%d%c:%d",
133 substream
->pcm
->card
->number
,
134 substream
->pcm
->device
,
135 substream
->stream
? 'c' : 'p',
139 #define XRUN_DEBUG_BASIC (1<<0)
140 #define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
141 #define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
142 #define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
143 #define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
144 #define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
145 #define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
147 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
149 #define xrun_debug(substream, mask) \
150 ((substream)->pstr->xrun_debug & (mask))
152 #define dump_stack_on_xrun(substream) do { \
153 if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
157 static void xrun(struct snd_pcm_substream
*substream
)
159 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
161 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
162 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
163 snd_pcm_stop(substream
, SNDRV_PCM_STATE_XRUN
);
164 if (xrun_debug(substream
, XRUN_DEBUG_BASIC
)) {
166 pcm_debug_name(substream
, name
, sizeof(name
));
167 snd_printd(KERN_DEBUG
"XRUN: %s\n", name
);
168 dump_stack_on_xrun(substream
);
172 #define hw_ptr_error(substream, fmt, args...) \
174 if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
175 xrun_log_show(substream); \
176 if (printk_ratelimit()) { \
177 snd_printd("PCM: " fmt, ##args); \
179 dump_stack_on_xrun(substream); \
183 #define XRUN_LOG_CNT 10
185 struct hwptr_log_entry
{
186 unsigned long jiffies
;
187 snd_pcm_uframes_t pos
;
188 snd_pcm_uframes_t period_size
;
189 snd_pcm_uframes_t buffer_size
;
190 snd_pcm_uframes_t old_hw_ptr
;
191 snd_pcm_uframes_t hw_ptr_base
;
194 struct snd_pcm_hwptr_log
{
197 struct hwptr_log_entry entries
[XRUN_LOG_CNT
];
200 static void xrun_log(struct snd_pcm_substream
*substream
,
201 snd_pcm_uframes_t pos
)
203 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
204 struct snd_pcm_hwptr_log
*log
= runtime
->hwptr_log
;
205 struct hwptr_log_entry
*entry
;
208 log
= kzalloc(sizeof(*log
), GFP_ATOMIC
);
211 runtime
->hwptr_log
= log
;
213 if (xrun_debug(substream
, XRUN_DEBUG_LOGONCE
) && log
->hit
)
216 entry
= &log
->entries
[log
->idx
];
217 entry
->jiffies
= jiffies
;
219 entry
->period_size
= runtime
->period_size
;
220 entry
->buffer_size
= runtime
->buffer_size
;;
221 entry
->old_hw_ptr
= runtime
->status
->hw_ptr
;
222 entry
->hw_ptr_base
= runtime
->hw_ptr_base
;
223 log
->idx
= (log
->idx
+ 1) % XRUN_LOG_CNT
;
226 static void xrun_log_show(struct snd_pcm_substream
*substream
)
228 struct snd_pcm_hwptr_log
*log
= substream
->runtime
->hwptr_log
;
229 struct hwptr_log_entry
*entry
;
236 if (xrun_debug(substream
, XRUN_DEBUG_LOGONCE
) && log
->hit
)
238 pcm_debug_name(substream
, name
, sizeof(name
));
239 for (cnt
= 0, idx
= log
->idx
; cnt
< XRUN_LOG_CNT
; cnt
++) {
240 entry
= &log
->entries
[idx
];
241 if (entry
->period_size
== 0)
243 snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
245 name
, entry
->jiffies
, (unsigned long)entry
->pos
,
246 (unsigned long)entry
->period_size
,
247 (unsigned long)entry
->buffer_size
,
248 (unsigned long)entry
->old_hw_ptr
,
249 (unsigned long)entry
->hw_ptr_base
);
256 #else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
258 #define xrun_debug(substream, mask) 0
259 #define xrun(substream) do { } while (0)
260 #define hw_ptr_error(substream, fmt, args...) do { } while (0)
261 #define xrun_log(substream, pos) do { } while (0)
262 #define xrun_log_show(substream) do { } while (0)
266 int snd_pcm_update_state(struct snd_pcm_substream
*substream
,
267 struct snd_pcm_runtime
*runtime
)
269 snd_pcm_uframes_t avail
;
271 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
272 avail
= snd_pcm_playback_avail(runtime
);
274 avail
= snd_pcm_capture_avail(runtime
);
275 if (avail
> runtime
->avail_max
)
276 runtime
->avail_max
= avail
;
277 if (runtime
->status
->state
== SNDRV_PCM_STATE_DRAINING
) {
278 if (avail
>= runtime
->buffer_size
) {
279 snd_pcm_drain_done(substream
);
283 if (avail
>= runtime
->stop_threshold
) {
288 if (avail
>= runtime
->control
->avail_min
)
289 wake_up(runtime
->twake
? &runtime
->tsleep
: &runtime
->sleep
);
293 static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream
*substream
,
294 unsigned int in_interrupt
)
296 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
297 snd_pcm_uframes_t pos
;
298 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
, hw_base
;
299 snd_pcm_sframes_t hdelta
, delta
;
300 unsigned long jdelta
;
302 old_hw_ptr
= runtime
->status
->hw_ptr
;
303 pos
= substream
->ops
->pointer(substream
);
304 if (pos
== SNDRV_PCM_POS_XRUN
) {
308 if (pos
>= runtime
->buffer_size
) {
309 if (printk_ratelimit()) {
311 pcm_debug_name(substream
, name
, sizeof(name
));
312 xrun_log_show(substream
);
313 snd_printd(KERN_ERR
"BUG: %s, pos = %ld, "
314 "buffer size = %ld, period size = %ld\n",
315 name
, pos
, runtime
->buffer_size
,
316 runtime
->period_size
);
320 pos
-= pos
% runtime
->min_align
;
321 if (xrun_debug(substream
, XRUN_DEBUG_LOG
))
322 xrun_log(substream
, pos
);
323 hw_base
= runtime
->hw_ptr_base
;
324 new_hw_ptr
= hw_base
+ pos
;
326 /* we know that one period was processed */
327 /* delta = "expected next hw_ptr" for in_interrupt != 0 */
328 delta
= runtime
->hw_ptr_interrupt
+ runtime
->period_size
;
329 if (delta
> new_hw_ptr
) {
330 hw_base
+= runtime
->buffer_size
;
331 if (hw_base
>= runtime
->boundary
)
333 new_hw_ptr
= hw_base
+ pos
;
337 /* new_hw_ptr might be lower than old_hw_ptr in case when */
338 /* pointer crosses the end of the ring buffer */
339 if (new_hw_ptr
< old_hw_ptr
) {
340 hw_base
+= runtime
->buffer_size
;
341 if (hw_base
>= runtime
->boundary
)
343 new_hw_ptr
= hw_base
+ pos
;
346 delta
= (new_hw_ptr
- old_hw_ptr
) % runtime
->boundary
;
347 if (xrun_debug(substream
, in_interrupt
?
348 XRUN_DEBUG_PERIODUPDATE
: XRUN_DEBUG_HWPTRUPDATE
)) {
350 pcm_debug_name(substream
, name
, sizeof(name
));
351 snd_printd("%s_update: %s: pos=%u/%u/%u, "
352 "hwptr=%ld/%ld/%ld/%ld\n",
353 in_interrupt
? "period" : "hwptr",
356 (unsigned int)runtime
->period_size
,
357 (unsigned int)runtime
->buffer_size
,
358 (unsigned long)delta
,
359 (unsigned long)old_hw_ptr
,
360 (unsigned long)new_hw_ptr
,
361 (unsigned long)runtime
->hw_ptr_base
);
363 /* something must be really wrong */
364 if (delta
>= runtime
->buffer_size
+ runtime
->period_size
) {
365 hw_ptr_error(substream
,
366 "Unexpected hw_pointer value %s"
367 "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
369 in_interrupt
? "[Q] " : "[P]",
370 substream
->stream
, (long)pos
,
371 (long)new_hw_ptr
, (long)old_hw_ptr
);
375 /* Do jiffies check only in xrun_debug mode */
376 if (!xrun_debug(substream
, XRUN_DEBUG_JIFFIESCHECK
))
377 goto no_jiffies_check
;
379 /* Skip the jiffies check for hardwares with BATCH flag.
380 * Such hardware usually just increases the position at each IRQ,
381 * thus it can't give any strange position.
383 if (runtime
->hw
.info
& SNDRV_PCM_INFO_BATCH
)
384 goto no_jiffies_check
;
386 if (hdelta
< runtime
->delay
)
387 goto no_jiffies_check
;
388 hdelta
-= runtime
->delay
;
389 jdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
390 if (((hdelta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
392 (((runtime
->period_size
* HZ
) / runtime
->rate
)
394 /* move new_hw_ptr according jiffies not pos variable */
395 new_hw_ptr
= old_hw_ptr
;
397 /* use loop to avoid checks for delta overflows */
398 /* the delta value is small or zero in most cases */
400 new_hw_ptr
+= runtime
->period_size
;
401 if (new_hw_ptr
>= runtime
->boundary
)
402 new_hw_ptr
-= runtime
->boundary
;
405 /* align hw_base to buffer_size */
406 hw_ptr_error(substream
,
407 "hw_ptr skipping! %s"
408 "(pos=%ld, delta=%ld, period=%ld, "
409 "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
410 in_interrupt
? "[Q] " : "",
411 (long)pos
, (long)hdelta
,
412 (long)runtime
->period_size
, jdelta
,
413 ((hdelta
* HZ
) / runtime
->rate
), hw_base
,
414 (unsigned long)old_hw_ptr
,
415 (unsigned long)new_hw_ptr
);
416 /* reset values to proper state */
418 hw_base
= new_hw_ptr
- (new_hw_ptr
% runtime
->buffer_size
);
421 if (delta
> runtime
->period_size
+ runtime
->period_size
/ 2) {
422 hw_ptr_error(substream
,
423 "Lost interrupts? %s"
424 "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
426 in_interrupt
? "[Q] " : "",
427 substream
->stream
, (long)delta
,
432 if (runtime
->status
->hw_ptr
== new_hw_ptr
)
435 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
436 runtime
->silence_size
> 0)
437 snd_pcm_playback_silence(substream
, new_hw_ptr
);
440 runtime
->hw_ptr_interrupt
= new_hw_ptr
-
441 (new_hw_ptr
% runtime
->period_size
);
443 runtime
->hw_ptr_base
= hw_base
;
444 runtime
->status
->hw_ptr
= new_hw_ptr
;
445 runtime
->hw_ptr_jiffies
= jiffies
;
446 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
447 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
449 return snd_pcm_update_state(substream
, runtime
);
452 /* CAUTION: call it with irq disabled */
453 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
)
455 return snd_pcm_update_hw_ptr0(substream
, 0);
459 * snd_pcm_set_ops - set the PCM operators
460 * @pcm: the pcm instance
461 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
462 * @ops: the operator table
464 * Sets the given PCM operators to the pcm instance.
466 void snd_pcm_set_ops(struct snd_pcm
*pcm
, int direction
, struct snd_pcm_ops
*ops
)
468 struct snd_pcm_str
*stream
= &pcm
->streams
[direction
];
469 struct snd_pcm_substream
*substream
;
471 for (substream
= stream
->substream
; substream
!= NULL
; substream
= substream
->next
)
472 substream
->ops
= ops
;
475 EXPORT_SYMBOL(snd_pcm_set_ops
);
478 * snd_pcm_sync - set the PCM sync id
479 * @substream: the pcm substream
481 * Sets the PCM sync identifier for the card.
483 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
)
485 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
487 runtime
->sync
.id32
[0] = substream
->pcm
->card
->number
;
488 runtime
->sync
.id32
[1] = -1;
489 runtime
->sync
.id32
[2] = -1;
490 runtime
->sync
.id32
[3] = -1;
493 EXPORT_SYMBOL(snd_pcm_set_sync
);
496 * Standard ioctl routine
499 static inline unsigned int div32(unsigned int a
, unsigned int b
,
510 static inline unsigned int div_down(unsigned int a
, unsigned int b
)
517 static inline unsigned int div_up(unsigned int a
, unsigned int b
)
529 static inline unsigned int mul(unsigned int a
, unsigned int b
)
533 if (div_down(UINT_MAX
, a
) < b
)
538 static inline unsigned int muldiv32(unsigned int a
, unsigned int b
,
539 unsigned int c
, unsigned int *r
)
541 u_int64_t n
= (u_int64_t
) a
* b
;
547 n
= div_u64_rem(n
, c
, r
);
556 * snd_interval_refine - refine the interval value of configurator
557 * @i: the interval value to refine
558 * @v: the interval value to refer to
560 * Refines the interval value with the reference value.
561 * The interval is changed to the range satisfying both intervals.
562 * The interval status (min, max, integer, etc.) are evaluated.
564 * Returns non-zero if the value is changed, zero if not changed.
566 int snd_interval_refine(struct snd_interval
*i
, const struct snd_interval
*v
)
569 if (snd_BUG_ON(snd_interval_empty(i
)))
571 if (i
->min
< v
->min
) {
573 i
->openmin
= v
->openmin
;
575 } else if (i
->min
== v
->min
&& !i
->openmin
&& v
->openmin
) {
579 if (i
->max
> v
->max
) {
581 i
->openmax
= v
->openmax
;
583 } else if (i
->max
== v
->max
&& !i
->openmax
&& v
->openmax
) {
587 if (!i
->integer
&& v
->integer
) {
600 } else if (!i
->openmin
&& !i
->openmax
&& i
->min
== i
->max
)
602 if (snd_interval_checkempty(i
)) {
603 snd_interval_none(i
);
609 EXPORT_SYMBOL(snd_interval_refine
);
611 static int snd_interval_refine_first(struct snd_interval
*i
)
613 if (snd_BUG_ON(snd_interval_empty(i
)))
615 if (snd_interval_single(i
))
618 i
->openmax
= i
->openmin
;
624 static int snd_interval_refine_last(struct snd_interval
*i
)
626 if (snd_BUG_ON(snd_interval_empty(i
)))
628 if (snd_interval_single(i
))
631 i
->openmin
= i
->openmax
;
637 void snd_interval_mul(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
639 if (a
->empty
|| b
->empty
) {
640 snd_interval_none(c
);
644 c
->min
= mul(a
->min
, b
->min
);
645 c
->openmin
= (a
->openmin
|| b
->openmin
);
646 c
->max
= mul(a
->max
, b
->max
);
647 c
->openmax
= (a
->openmax
|| b
->openmax
);
648 c
->integer
= (a
->integer
&& b
->integer
);
652 * snd_interval_div - refine the interval value with division
659 * Returns non-zero if the value is changed, zero if not changed.
661 void snd_interval_div(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
664 if (a
->empty
|| b
->empty
) {
665 snd_interval_none(c
);
669 c
->min
= div32(a
->min
, b
->max
, &r
);
670 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
672 c
->max
= div32(a
->max
, b
->min
, &r
);
677 c
->openmax
= (a
->openmax
|| b
->openmin
);
686 * snd_interval_muldivk - refine the interval value
689 * @k: divisor (as integer)
694 * Returns non-zero if the value is changed, zero if not changed.
696 void snd_interval_muldivk(const struct snd_interval
*a
, const struct snd_interval
*b
,
697 unsigned int k
, struct snd_interval
*c
)
700 if (a
->empty
|| b
->empty
) {
701 snd_interval_none(c
);
705 c
->min
= muldiv32(a
->min
, b
->min
, k
, &r
);
706 c
->openmin
= (r
|| a
->openmin
|| b
->openmin
);
707 c
->max
= muldiv32(a
->max
, b
->max
, k
, &r
);
712 c
->openmax
= (a
->openmax
|| b
->openmax
);
717 * snd_interval_mulkdiv - refine the interval value
719 * @k: dividend 2 (as integer)
725 * Returns non-zero if the value is changed, zero if not changed.
727 void snd_interval_mulkdiv(const struct snd_interval
*a
, unsigned int k
,
728 const struct snd_interval
*b
, struct snd_interval
*c
)
731 if (a
->empty
|| b
->empty
) {
732 snd_interval_none(c
);
736 c
->min
= muldiv32(a
->min
, k
, b
->max
, &r
);
737 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
739 c
->max
= muldiv32(a
->max
, k
, b
->min
, &r
);
744 c
->openmax
= (a
->openmax
|| b
->openmin
);
756 * snd_interval_ratnum - refine the interval value
757 * @i: interval to refine
758 * @rats_count: number of ratnum_t
759 * @rats: ratnum_t array
760 * @nump: pointer to store the resultant numerator
761 * @denp: pointer to store the resultant denominator
763 * Returns non-zero if the value is changed, zero if not changed.
765 int snd_interval_ratnum(struct snd_interval
*i
,
766 unsigned int rats_count
, struct snd_ratnum
*rats
,
767 unsigned int *nump
, unsigned int *denp
)
769 unsigned int best_num
, best_den
;
772 struct snd_interval t
;
774 unsigned int result_num
, result_den
;
777 best_num
= best_den
= best_diff
= 0;
778 for (k
= 0; k
< rats_count
; ++k
) {
779 unsigned int num
= rats
[k
].num
;
781 unsigned int q
= i
->min
;
785 den
= div_up(num
, q
);
786 if (den
< rats
[k
].den_min
)
788 if (den
> rats
[k
].den_max
)
789 den
= rats
[k
].den_max
;
792 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
796 diff
= num
- q
* den
;
800 diff
* best_den
< best_diff
* den
) {
810 t
.min
= div_down(best_num
, best_den
);
811 t
.openmin
= !!(best_num
% best_den
);
813 result_num
= best_num
;
814 result_diff
= best_diff
;
815 result_den
= best_den
;
816 best_num
= best_den
= best_diff
= 0;
817 for (k
= 0; k
< rats_count
; ++k
) {
818 unsigned int num
= rats
[k
].num
;
820 unsigned int q
= i
->max
;
826 den
= div_down(num
, q
);
827 if (den
> rats
[k
].den_max
)
829 if (den
< rats
[k
].den_min
)
830 den
= rats
[k
].den_min
;
833 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
835 den
+= rats
[k
].den_step
- r
;
837 diff
= q
* den
- num
;
841 diff
* best_den
< best_diff
* den
) {
851 t
.max
= div_up(best_num
, best_den
);
852 t
.openmax
= !!(best_num
% best_den
);
854 err
= snd_interval_refine(i
, &t
);
858 if (snd_interval_single(i
)) {
859 if (best_diff
* result_den
< result_diff
* best_den
) {
860 result_num
= best_num
;
861 result_den
= best_den
;
871 EXPORT_SYMBOL(snd_interval_ratnum
);
874 * snd_interval_ratden - refine the interval value
875 * @i: interval to refine
876 * @rats_count: number of struct ratden
877 * @rats: struct ratden array
878 * @nump: pointer to store the resultant numerator
879 * @denp: pointer to store the resultant denominator
881 * Returns non-zero if the value is changed, zero if not changed.
883 static int snd_interval_ratden(struct snd_interval
*i
,
884 unsigned int rats_count
, struct snd_ratden
*rats
,
885 unsigned int *nump
, unsigned int *denp
)
887 unsigned int best_num
, best_diff
, best_den
;
889 struct snd_interval t
;
892 best_num
= best_den
= best_diff
= 0;
893 for (k
= 0; k
< rats_count
; ++k
) {
895 unsigned int den
= rats
[k
].den
;
896 unsigned int q
= i
->min
;
899 if (num
> rats
[k
].num_max
)
901 if (num
< rats
[k
].num_min
)
902 num
= rats
[k
].num_max
;
905 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
907 num
+= rats
[k
].num_step
- r
;
909 diff
= num
- q
* den
;
911 diff
* best_den
< best_diff
* den
) {
921 t
.min
= div_down(best_num
, best_den
);
922 t
.openmin
= !!(best_num
% best_den
);
924 best_num
= best_den
= best_diff
= 0;
925 for (k
= 0; k
< rats_count
; ++k
) {
927 unsigned int den
= rats
[k
].den
;
928 unsigned int q
= i
->max
;
931 if (num
< rats
[k
].num_min
)
933 if (num
> rats
[k
].num_max
)
934 num
= rats
[k
].num_max
;
937 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
941 diff
= q
* den
- num
;
943 diff
* best_den
< best_diff
* den
) {
953 t
.max
= div_up(best_num
, best_den
);
954 t
.openmax
= !!(best_num
% best_den
);
956 err
= snd_interval_refine(i
, &t
);
960 if (snd_interval_single(i
)) {
970 * snd_interval_list - refine the interval value from the list
971 * @i: the interval value to refine
972 * @count: the number of elements in the list
973 * @list: the value list
974 * @mask: the bit-mask to evaluate
976 * Refines the interval value from the list.
977 * When mask is non-zero, only the elements corresponding to bit 1 are
980 * Returns non-zero if the value is changed, zero if not changed.
982 int snd_interval_list(struct snd_interval
*i
, unsigned int count
, unsigned int *list
, unsigned int mask
)
985 struct snd_interval list_range
;
991 snd_interval_any(&list_range
);
992 list_range
.min
= UINT_MAX
;
994 for (k
= 0; k
< count
; k
++) {
995 if (mask
&& !(mask
& (1 << k
)))
997 if (!snd_interval_test(i
, list
[k
]))
999 list_range
.min
= min(list_range
.min
, list
[k
]);
1000 list_range
.max
= max(list_range
.max
, list
[k
]);
1002 return snd_interval_refine(i
, &list_range
);
1005 EXPORT_SYMBOL(snd_interval_list
);
1007 static int snd_interval_step(struct snd_interval
*i
, unsigned int min
, unsigned int step
)
1011 n
= (i
->min
- min
) % step
;
1012 if (n
!= 0 || i
->openmin
) {
1016 n
= (i
->max
- min
) % step
;
1017 if (n
!= 0 || i
->openmax
) {
1021 if (snd_interval_checkempty(i
)) {
1028 /* Info constraints helpers */
1031 * snd_pcm_hw_rule_add - add the hw-constraint rule
1032 * @runtime: the pcm runtime instance
1033 * @cond: condition bits
1034 * @var: the variable to evaluate
1035 * @func: the evaluation function
1036 * @private: the private data pointer passed to function
1037 * @dep: the dependent variables
1039 * Returns zero if successful, or a negative error code on failure.
1041 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
, unsigned int cond
,
1043 snd_pcm_hw_rule_func_t func
, void *private,
1046 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1047 struct snd_pcm_hw_rule
*c
;
1050 va_start(args
, dep
);
1051 if (constrs
->rules_num
>= constrs
->rules_all
) {
1052 struct snd_pcm_hw_rule
*new;
1053 unsigned int new_rules
= constrs
->rules_all
+ 16;
1054 new = kcalloc(new_rules
, sizeof(*c
), GFP_KERNEL
);
1057 if (constrs
->rules
) {
1058 memcpy(new, constrs
->rules
,
1059 constrs
->rules_num
* sizeof(*c
));
1060 kfree(constrs
->rules
);
1062 constrs
->rules
= new;
1063 constrs
->rules_all
= new_rules
;
1065 c
= &constrs
->rules
[constrs
->rules_num
];
1069 c
->private = private;
1072 if (snd_BUG_ON(k
>= ARRAY_SIZE(c
->deps
)))
1077 dep
= va_arg(args
, int);
1079 constrs
->rules_num
++;
1084 EXPORT_SYMBOL(snd_pcm_hw_rule_add
);
1087 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1088 * @runtime: PCM runtime instance
1089 * @var: hw_params variable to apply the mask
1090 * @mask: the bitmap mask
1092 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1094 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1097 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1098 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1099 *maskp
->bits
&= mask
;
1100 memset(maskp
->bits
+ 1, 0, (SNDRV_MASK_MAX
-32) / 8); /* clear rest */
1101 if (*maskp
->bits
== 0)
1107 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1108 * @runtime: PCM runtime instance
1109 * @var: hw_params variable to apply the mask
1110 * @mask: the 64bit bitmap mask
1112 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1114 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1117 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1118 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1119 maskp
->bits
[0] &= (u_int32_t
)mask
;
1120 maskp
->bits
[1] &= (u_int32_t
)(mask
>> 32);
1121 memset(maskp
->bits
+ 2, 0, (SNDRV_MASK_MAX
-64) / 8); /* clear rest */
1122 if (! maskp
->bits
[0] && ! maskp
->bits
[1])
1128 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1129 * @runtime: PCM runtime instance
1130 * @var: hw_params variable to apply the integer constraint
1132 * Apply the constraint of integer to an interval parameter.
1134 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
)
1136 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1137 return snd_interval_setinteger(constrs_interval(constrs
, var
));
1140 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer
);
1143 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1144 * @runtime: PCM runtime instance
1145 * @var: hw_params variable to apply the range
1146 * @min: the minimal value
1147 * @max: the maximal value
1149 * Apply the min/max range constraint to an interval parameter.
1151 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1152 unsigned int min
, unsigned int max
)
1154 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1155 struct snd_interval t
;
1158 t
.openmin
= t
.openmax
= 0;
1160 return snd_interval_refine(constrs_interval(constrs
, var
), &t
);
1163 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax
);
1165 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params
*params
,
1166 struct snd_pcm_hw_rule
*rule
)
1168 struct snd_pcm_hw_constraint_list
*list
= rule
->private;
1169 return snd_interval_list(hw_param_interval(params
, rule
->var
), list
->count
, list
->list
, list
->mask
);
1174 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1175 * @runtime: PCM runtime instance
1176 * @cond: condition bits
1177 * @var: hw_params variable to apply the list constraint
1180 * Apply the list of constraints to an interval parameter.
1182 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
1184 snd_pcm_hw_param_t var
,
1185 struct snd_pcm_hw_constraint_list
*l
)
1187 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1188 snd_pcm_hw_rule_list
, l
,
1192 EXPORT_SYMBOL(snd_pcm_hw_constraint_list
);
1194 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params
*params
,
1195 struct snd_pcm_hw_rule
*rule
)
1197 struct snd_pcm_hw_constraint_ratnums
*r
= rule
->private;
1198 unsigned int num
= 0, den
= 0;
1200 err
= snd_interval_ratnum(hw_param_interval(params
, rule
->var
),
1201 r
->nrats
, r
->rats
, &num
, &den
);
1202 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1203 params
->rate_num
= num
;
1204 params
->rate_den
= den
;
1210 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1211 * @runtime: PCM runtime instance
1212 * @cond: condition bits
1213 * @var: hw_params variable to apply the ratnums constraint
1214 * @r: struct snd_ratnums constriants
1216 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
1218 snd_pcm_hw_param_t var
,
1219 struct snd_pcm_hw_constraint_ratnums
*r
)
1221 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1222 snd_pcm_hw_rule_ratnums
, r
,
1226 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums
);
1228 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params
*params
,
1229 struct snd_pcm_hw_rule
*rule
)
1231 struct snd_pcm_hw_constraint_ratdens
*r
= rule
->private;
1232 unsigned int num
= 0, den
= 0;
1233 int err
= snd_interval_ratden(hw_param_interval(params
, rule
->var
),
1234 r
->nrats
, r
->rats
, &num
, &den
);
1235 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1236 params
->rate_num
= num
;
1237 params
->rate_den
= den
;
1243 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1244 * @runtime: PCM runtime instance
1245 * @cond: condition bits
1246 * @var: hw_params variable to apply the ratdens constraint
1247 * @r: struct snd_ratdens constriants
1249 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
1251 snd_pcm_hw_param_t var
,
1252 struct snd_pcm_hw_constraint_ratdens
*r
)
1254 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1255 snd_pcm_hw_rule_ratdens
, r
,
1259 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens
);
1261 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params
*params
,
1262 struct snd_pcm_hw_rule
*rule
)
1264 unsigned int l
= (unsigned long) rule
->private;
1265 int width
= l
& 0xffff;
1266 unsigned int msbits
= l
>> 16;
1267 struct snd_interval
*i
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_SAMPLE_BITS
);
1268 if (snd_interval_single(i
) && snd_interval_value(i
) == width
)
1269 params
->msbits
= msbits
;
1274 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1275 * @runtime: PCM runtime instance
1276 * @cond: condition bits
1277 * @width: sample bits width
1278 * @msbits: msbits width
1280 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
1283 unsigned int msbits
)
1285 unsigned long l
= (msbits
<< 16) | width
;
1286 return snd_pcm_hw_rule_add(runtime
, cond
, -1,
1287 snd_pcm_hw_rule_msbits
,
1289 SNDRV_PCM_HW_PARAM_SAMPLE_BITS
, -1);
1292 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits
);
1294 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params
*params
,
1295 struct snd_pcm_hw_rule
*rule
)
1297 unsigned long step
= (unsigned long) rule
->private;
1298 return snd_interval_step(hw_param_interval(params
, rule
->var
), 0, step
);
1302 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1303 * @runtime: PCM runtime instance
1304 * @cond: condition bits
1305 * @var: hw_params variable to apply the step constraint
1308 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
1310 snd_pcm_hw_param_t var
,
1313 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1314 snd_pcm_hw_rule_step
, (void *) step
,
1318 EXPORT_SYMBOL(snd_pcm_hw_constraint_step
);
1320 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params
*params
, struct snd_pcm_hw_rule
*rule
)
1322 static unsigned int pow2_sizes
[] = {
1323 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1324 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1325 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1326 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1328 return snd_interval_list(hw_param_interval(params
, rule
->var
),
1329 ARRAY_SIZE(pow2_sizes
), pow2_sizes
, 0);
1333 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1334 * @runtime: PCM runtime instance
1335 * @cond: condition bits
1336 * @var: hw_params variable to apply the power-of-2 constraint
1338 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
1340 snd_pcm_hw_param_t var
)
1342 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1343 snd_pcm_hw_rule_pow2
, NULL
,
1347 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2
);
1349 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params
*params
,
1350 snd_pcm_hw_param_t var
)
1352 if (hw_is_mask(var
)) {
1353 snd_mask_any(hw_param_mask(params
, var
));
1354 params
->cmask
|= 1 << var
;
1355 params
->rmask
|= 1 << var
;
1358 if (hw_is_interval(var
)) {
1359 snd_interval_any(hw_param_interval(params
, var
));
1360 params
->cmask
|= 1 << var
;
1361 params
->rmask
|= 1 << var
;
1367 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
)
1370 memset(params
, 0, sizeof(*params
));
1371 for (k
= SNDRV_PCM_HW_PARAM_FIRST_MASK
; k
<= SNDRV_PCM_HW_PARAM_LAST_MASK
; k
++)
1372 _snd_pcm_hw_param_any(params
, k
);
1373 for (k
= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
; k
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
; k
++)
1374 _snd_pcm_hw_param_any(params
, k
);
1378 EXPORT_SYMBOL(_snd_pcm_hw_params_any
);
1381 * snd_pcm_hw_param_value - return @params field @var value
1382 * @params: the hw_params instance
1383 * @var: parameter to retrieve
1384 * @dir: pointer to the direction (-1,0,1) or %NULL
1386 * Return the value for field @var if it's fixed in configuration space
1387 * defined by @params. Return -%EINVAL otherwise.
1389 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
1390 snd_pcm_hw_param_t var
, int *dir
)
1392 if (hw_is_mask(var
)) {
1393 const struct snd_mask
*mask
= hw_param_mask_c(params
, var
);
1394 if (!snd_mask_single(mask
))
1398 return snd_mask_value(mask
);
1400 if (hw_is_interval(var
)) {
1401 const struct snd_interval
*i
= hw_param_interval_c(params
, var
);
1402 if (!snd_interval_single(i
))
1406 return snd_interval_value(i
);
1411 EXPORT_SYMBOL(snd_pcm_hw_param_value
);
1413 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
,
1414 snd_pcm_hw_param_t var
)
1416 if (hw_is_mask(var
)) {
1417 snd_mask_none(hw_param_mask(params
, var
));
1418 params
->cmask
|= 1 << var
;
1419 params
->rmask
|= 1 << var
;
1420 } else if (hw_is_interval(var
)) {
1421 snd_interval_none(hw_param_interval(params
, var
));
1422 params
->cmask
|= 1 << var
;
1423 params
->rmask
|= 1 << var
;
1429 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty
);
1431 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params
*params
,
1432 snd_pcm_hw_param_t var
)
1435 if (hw_is_mask(var
))
1436 changed
= snd_mask_refine_first(hw_param_mask(params
, var
));
1437 else if (hw_is_interval(var
))
1438 changed
= snd_interval_refine_first(hw_param_interval(params
, var
));
1442 params
->cmask
|= 1 << var
;
1443 params
->rmask
|= 1 << var
;
1450 * snd_pcm_hw_param_first - refine config space and return minimum value
1451 * @pcm: PCM instance
1452 * @params: the hw_params instance
1453 * @var: parameter to retrieve
1454 * @dir: pointer to the direction (-1,0,1) or %NULL
1456 * Inside configuration space defined by @params remove from @var all
1457 * values > minimum. Reduce configuration space accordingly.
1458 * Return the minimum.
1460 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
1461 struct snd_pcm_hw_params
*params
,
1462 snd_pcm_hw_param_t var
, int *dir
)
1464 int changed
= _snd_pcm_hw_param_first(params
, var
);
1467 if (params
->rmask
) {
1468 int err
= snd_pcm_hw_refine(pcm
, params
);
1469 if (snd_BUG_ON(err
< 0))
1472 return snd_pcm_hw_param_value(params
, var
, dir
);
1475 EXPORT_SYMBOL(snd_pcm_hw_param_first
);
1477 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params
*params
,
1478 snd_pcm_hw_param_t var
)
1481 if (hw_is_mask(var
))
1482 changed
= snd_mask_refine_last(hw_param_mask(params
, var
));
1483 else if (hw_is_interval(var
))
1484 changed
= snd_interval_refine_last(hw_param_interval(params
, var
));
1488 params
->cmask
|= 1 << var
;
1489 params
->rmask
|= 1 << var
;
1496 * snd_pcm_hw_param_last - refine config space and return maximum value
1497 * @pcm: PCM instance
1498 * @params: the hw_params instance
1499 * @var: parameter to retrieve
1500 * @dir: pointer to the direction (-1,0,1) or %NULL
1502 * Inside configuration space defined by @params remove from @var all
1503 * values < maximum. Reduce configuration space accordingly.
1504 * Return the maximum.
1506 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
1507 struct snd_pcm_hw_params
*params
,
1508 snd_pcm_hw_param_t var
, int *dir
)
1510 int changed
= _snd_pcm_hw_param_last(params
, var
);
1513 if (params
->rmask
) {
1514 int err
= snd_pcm_hw_refine(pcm
, params
);
1515 if (snd_BUG_ON(err
< 0))
1518 return snd_pcm_hw_param_value(params
, var
, dir
);
1521 EXPORT_SYMBOL(snd_pcm_hw_param_last
);
1524 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1525 * @pcm: PCM instance
1526 * @params: the hw_params instance
1528 * Choose one configuration from configuration space defined by @params.
1529 * The configuration chosen is that obtained fixing in this order:
1530 * first access, first format, first subformat, min channels,
1531 * min rate, min period time, max buffer size, min tick time
1533 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*pcm
,
1534 struct snd_pcm_hw_params
*params
)
1536 static int vars
[] = {
1537 SNDRV_PCM_HW_PARAM_ACCESS
,
1538 SNDRV_PCM_HW_PARAM_FORMAT
,
1539 SNDRV_PCM_HW_PARAM_SUBFORMAT
,
1540 SNDRV_PCM_HW_PARAM_CHANNELS
,
1541 SNDRV_PCM_HW_PARAM_RATE
,
1542 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1543 SNDRV_PCM_HW_PARAM_BUFFER_SIZE
,
1544 SNDRV_PCM_HW_PARAM_TICK_TIME
,
1549 for (v
= vars
; *v
!= -1; v
++) {
1550 if (*v
!= SNDRV_PCM_HW_PARAM_BUFFER_SIZE
)
1551 err
= snd_pcm_hw_param_first(pcm
, params
, *v
, NULL
);
1553 err
= snd_pcm_hw_param_last(pcm
, params
, *v
, NULL
);
1554 if (snd_BUG_ON(err
< 0))
1560 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream
*substream
,
1563 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1564 unsigned long flags
;
1565 snd_pcm_stream_lock_irqsave(substream
, flags
);
1566 if (snd_pcm_running(substream
) &&
1567 snd_pcm_update_hw_ptr(substream
) >= 0)
1568 runtime
->status
->hw_ptr
%= runtime
->buffer_size
;
1570 runtime
->status
->hw_ptr
= 0;
1571 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1575 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream
*substream
,
1578 struct snd_pcm_channel_info
*info
= arg
;
1579 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1581 if (!(runtime
->info
& SNDRV_PCM_INFO_MMAP
)) {
1585 width
= snd_pcm_format_physical_width(runtime
->format
);
1589 switch (runtime
->access
) {
1590 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
:
1591 case SNDRV_PCM_ACCESS_RW_INTERLEAVED
:
1592 info
->first
= info
->channel
* width
;
1593 info
->step
= runtime
->channels
* width
;
1595 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED
:
1596 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
:
1598 size_t size
= runtime
->dma_bytes
/ runtime
->channels
;
1599 info
->first
= info
->channel
* size
* 8;
1610 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream
*substream
,
1613 struct snd_pcm_hw_params
*params
= arg
;
1614 snd_pcm_format_t format
;
1615 int channels
, width
;
1617 params
->fifo_size
= substream
->runtime
->hw
.fifo_size
;
1618 if (!(substream
->runtime
->hw
.info
& SNDRV_PCM_INFO_FIFO_IN_FRAMES
)) {
1619 format
= params_format(params
);
1620 channels
= params_channels(params
);
1621 width
= snd_pcm_format_physical_width(format
);
1622 params
->fifo_size
/= width
* channels
;
1628 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1629 * @substream: the pcm substream instance
1630 * @cmd: ioctl command
1631 * @arg: ioctl argument
1633 * Processes the generic ioctl commands for PCM.
1634 * Can be passed as the ioctl callback for PCM ops.
1636 * Returns zero if successful, or a negative error code on failure.
1638 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
1639 unsigned int cmd
, void *arg
)
1642 case SNDRV_PCM_IOCTL1_INFO
:
1644 case SNDRV_PCM_IOCTL1_RESET
:
1645 return snd_pcm_lib_ioctl_reset(substream
, arg
);
1646 case SNDRV_PCM_IOCTL1_CHANNEL_INFO
:
1647 return snd_pcm_lib_ioctl_channel_info(substream
, arg
);
1648 case SNDRV_PCM_IOCTL1_FIFO_SIZE
:
1649 return snd_pcm_lib_ioctl_fifo_size(substream
, arg
);
1654 EXPORT_SYMBOL(snd_pcm_lib_ioctl
);
1657 * snd_pcm_period_elapsed - update the pcm status for the next period
1658 * @substream: the pcm substream instance
1660 * This function is called from the interrupt handler when the
1661 * PCM has processed the period size. It will update the current
1662 * pointer, wake up sleepers, etc.
1664 * Even if more than one periods have elapsed since the last call, you
1665 * have to call this only once.
1667 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
)
1669 struct snd_pcm_runtime
*runtime
;
1670 unsigned long flags
;
1672 if (PCM_RUNTIME_CHECK(substream
))
1674 runtime
= substream
->runtime
;
1676 if (runtime
->transfer_ack_begin
)
1677 runtime
->transfer_ack_begin(substream
);
1679 snd_pcm_stream_lock_irqsave(substream
, flags
);
1680 if (!snd_pcm_running(substream
) ||
1681 snd_pcm_update_hw_ptr0(substream
, 1) < 0)
1684 if (substream
->timer_running
)
1685 snd_timer_interrupt(substream
->timer
, 1);
1687 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1688 if (runtime
->transfer_ack_end
)
1689 runtime
->transfer_ack_end(substream
);
1690 kill_fasync(&runtime
->fasync
, SIGIO
, POLL_IN
);
1693 EXPORT_SYMBOL(snd_pcm_period_elapsed
);
1696 * Wait until avail_min data becomes available
1697 * Returns a negative error code if any error occurs during operation.
1698 * The available space is stored on availp. When err = 0 and avail = 0
1699 * on the capture stream, it indicates the stream is in DRAINING state.
1701 static int wait_for_avail_min(struct snd_pcm_substream
*substream
,
1702 snd_pcm_uframes_t
*availp
)
1704 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1705 int is_playback
= substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
;
1708 snd_pcm_uframes_t avail
= 0;
1711 init_waitqueue_entry(&wait
, current
);
1712 add_wait_queue(&runtime
->tsleep
, &wait
);
1714 if (signal_pending(current
)) {
1718 set_current_state(TASK_INTERRUPTIBLE
);
1719 snd_pcm_stream_unlock_irq(substream
);
1720 tout
= schedule_timeout(msecs_to_jiffies(10000));
1721 snd_pcm_stream_lock_irq(substream
);
1722 switch (runtime
->status
->state
) {
1723 case SNDRV_PCM_STATE_SUSPENDED
:
1726 case SNDRV_PCM_STATE_XRUN
:
1729 case SNDRV_PCM_STATE_DRAINING
:
1733 avail
= 0; /* indicate draining */
1735 case SNDRV_PCM_STATE_OPEN
:
1736 case SNDRV_PCM_STATE_SETUP
:
1737 case SNDRV_PCM_STATE_DISCONNECTED
:
1742 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1743 is_playback
? "playback" : "capture");
1748 avail
= snd_pcm_playback_avail(runtime
);
1750 avail
= snd_pcm_capture_avail(runtime
);
1751 if (avail
>= runtime
->control
->avail_min
)
1755 remove_wait_queue(&runtime
->tsleep
, &wait
);
1760 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream
*substream
,
1762 unsigned long data
, unsigned int off
,
1763 snd_pcm_uframes_t frames
)
1765 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1767 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1768 if (substream
->ops
->copy
) {
1769 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1772 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1773 if (copy_from_user(hwbuf
, buf
, frames_to_bytes(runtime
, frames
)))
1779 typedef int (*transfer_f
)(struct snd_pcm_substream
*substream
, unsigned int hwoff
,
1780 unsigned long data
, unsigned int off
,
1781 snd_pcm_uframes_t size
);
1783 static snd_pcm_sframes_t
snd_pcm_lib_write1(struct snd_pcm_substream
*substream
,
1785 snd_pcm_uframes_t size
,
1787 transfer_f transfer
)
1789 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1790 snd_pcm_uframes_t xfer
= 0;
1791 snd_pcm_uframes_t offset
= 0;
1797 snd_pcm_stream_lock_irq(substream
);
1798 switch (runtime
->status
->state
) {
1799 case SNDRV_PCM_STATE_PREPARED
:
1800 case SNDRV_PCM_STATE_RUNNING
:
1801 case SNDRV_PCM_STATE_PAUSED
:
1803 case SNDRV_PCM_STATE_XRUN
:
1806 case SNDRV_PCM_STATE_SUSPENDED
:
1816 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1817 snd_pcm_uframes_t avail
;
1818 snd_pcm_uframes_t cont
;
1819 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1820 snd_pcm_update_hw_ptr(substream
);
1821 avail
= snd_pcm_playback_avail(runtime
);
1827 err
= wait_for_avail_min(substream
, &avail
);
1831 frames
= size
> avail
? avail
: size
;
1832 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
1835 if (snd_BUG_ON(!frames
)) {
1837 snd_pcm_stream_unlock_irq(substream
);
1840 appl_ptr
= runtime
->control
->appl_ptr
;
1841 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
1842 snd_pcm_stream_unlock_irq(substream
);
1843 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
1844 snd_pcm_stream_lock_irq(substream
);
1847 switch (runtime
->status
->state
) {
1848 case SNDRV_PCM_STATE_XRUN
:
1851 case SNDRV_PCM_STATE_SUSPENDED
:
1858 if (appl_ptr
>= runtime
->boundary
)
1859 appl_ptr
-= runtime
->boundary
;
1860 runtime
->control
->appl_ptr
= appl_ptr
;
1861 if (substream
->ops
->ack
)
1862 substream
->ops
->ack(substream
);
1867 if (runtime
->status
->state
== SNDRV_PCM_STATE_PREPARED
&&
1868 snd_pcm_playback_hw_avail(runtime
) >= (snd_pcm_sframes_t
)runtime
->start_threshold
) {
1869 err
= snd_pcm_start(substream
);
1876 if (xfer
> 0 && err
>= 0)
1877 snd_pcm_update_state(substream
, runtime
);
1878 snd_pcm_stream_unlock_irq(substream
);
1879 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
1882 /* sanity-check for read/write methods */
1883 static int pcm_sanity_check(struct snd_pcm_substream
*substream
)
1885 struct snd_pcm_runtime
*runtime
;
1886 if (PCM_RUNTIME_CHECK(substream
))
1888 runtime
= substream
->runtime
;
1889 if (snd_BUG_ON(!substream
->ops
->copy
&& !runtime
->dma_area
))
1891 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
1896 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
, const void __user
*buf
, snd_pcm_uframes_t size
)
1898 struct snd_pcm_runtime
*runtime
;
1902 err
= pcm_sanity_check(substream
);
1905 runtime
= substream
->runtime
;
1906 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1908 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
&&
1909 runtime
->channels
> 1)
1911 return snd_pcm_lib_write1(substream
, (unsigned long)buf
, size
, nonblock
,
1912 snd_pcm_lib_write_transfer
);
1915 EXPORT_SYMBOL(snd_pcm_lib_write
);
1917 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream
*substream
,
1919 unsigned long data
, unsigned int off
,
1920 snd_pcm_uframes_t frames
)
1922 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1924 void __user
**bufs
= (void __user
**)data
;
1925 int channels
= runtime
->channels
;
1927 if (substream
->ops
->copy
) {
1928 if (snd_BUG_ON(!substream
->ops
->silence
))
1930 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1931 if (*bufs
== NULL
) {
1932 if ((err
= substream
->ops
->silence(substream
, c
, hwoff
, frames
)) < 0)
1935 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1936 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
1941 /* default transfer behaviour */
1942 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
1943 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1944 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
1945 if (*bufs
== NULL
) {
1946 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, frames
);
1948 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1949 if (copy_from_user(hwbuf
, buf
, samples_to_bytes(runtime
, frames
)))
1957 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
1959 snd_pcm_uframes_t frames
)
1961 struct snd_pcm_runtime
*runtime
;
1965 err
= pcm_sanity_check(substream
);
1968 runtime
= substream
->runtime
;
1969 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1971 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
1973 return snd_pcm_lib_write1(substream
, (unsigned long)bufs
, frames
,
1974 nonblock
, snd_pcm_lib_writev_transfer
);
1977 EXPORT_SYMBOL(snd_pcm_lib_writev
);
1979 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream
*substream
,
1981 unsigned long data
, unsigned int off
,
1982 snd_pcm_uframes_t frames
)
1984 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1986 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1987 if (substream
->ops
->copy
) {
1988 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1991 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1992 if (copy_to_user(buf
, hwbuf
, frames_to_bytes(runtime
, frames
)))
1998 static snd_pcm_sframes_t
snd_pcm_lib_read1(struct snd_pcm_substream
*substream
,
2000 snd_pcm_uframes_t size
,
2002 transfer_f transfer
)
2004 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2005 snd_pcm_uframes_t xfer
= 0;
2006 snd_pcm_uframes_t offset
= 0;
2012 snd_pcm_stream_lock_irq(substream
);
2013 switch (runtime
->status
->state
) {
2014 case SNDRV_PCM_STATE_PREPARED
:
2015 if (size
>= runtime
->start_threshold
) {
2016 err
= snd_pcm_start(substream
);
2021 case SNDRV_PCM_STATE_DRAINING
:
2022 case SNDRV_PCM_STATE_RUNNING
:
2023 case SNDRV_PCM_STATE_PAUSED
:
2025 case SNDRV_PCM_STATE_XRUN
:
2028 case SNDRV_PCM_STATE_SUSPENDED
:
2038 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
2039 snd_pcm_uframes_t avail
;
2040 snd_pcm_uframes_t cont
;
2041 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
2042 snd_pcm_update_hw_ptr(substream
);
2043 avail
= snd_pcm_capture_avail(runtime
);
2045 if (runtime
->status
->state
==
2046 SNDRV_PCM_STATE_DRAINING
) {
2047 snd_pcm_stop(substream
, SNDRV_PCM_STATE_SETUP
);
2054 err
= wait_for_avail_min(substream
, &avail
);
2058 continue; /* draining */
2060 frames
= size
> avail
? avail
: size
;
2061 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
2064 if (snd_BUG_ON(!frames
)) {
2066 snd_pcm_stream_unlock_irq(substream
);
2069 appl_ptr
= runtime
->control
->appl_ptr
;
2070 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2071 snd_pcm_stream_unlock_irq(substream
);
2072 err
= transfer(substream
, appl_ofs
, data
, offset
, frames
);
2073 snd_pcm_stream_lock_irq(substream
);
2076 switch (runtime
->status
->state
) {
2077 case SNDRV_PCM_STATE_XRUN
:
2080 case SNDRV_PCM_STATE_SUSPENDED
:
2087 if (appl_ptr
>= runtime
->boundary
)
2088 appl_ptr
-= runtime
->boundary
;
2089 runtime
->control
->appl_ptr
= appl_ptr
;
2090 if (substream
->ops
->ack
)
2091 substream
->ops
->ack(substream
);
2099 if (xfer
> 0 && err
>= 0)
2100 snd_pcm_update_state(substream
, runtime
);
2101 snd_pcm_stream_unlock_irq(substream
);
2102 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2105 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
, void __user
*buf
, snd_pcm_uframes_t size
)
2107 struct snd_pcm_runtime
*runtime
;
2111 err
= pcm_sanity_check(substream
);
2114 runtime
= substream
->runtime
;
2115 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2116 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
2118 return snd_pcm_lib_read1(substream
, (unsigned long)buf
, size
, nonblock
, snd_pcm_lib_read_transfer
);
2121 EXPORT_SYMBOL(snd_pcm_lib_read
);
2123 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream
*substream
,
2125 unsigned long data
, unsigned int off
,
2126 snd_pcm_uframes_t frames
)
2128 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2130 void __user
**bufs
= (void __user
**)data
;
2131 int channels
= runtime
->channels
;
2133 if (substream
->ops
->copy
) {
2134 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2138 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2139 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2143 snd_pcm_uframes_t dma_csize
= runtime
->dma_bytes
/ channels
;
2144 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2150 hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2151 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2152 if (copy_to_user(buf
, hwbuf
, samples_to_bytes(runtime
, frames
)))
2159 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
2161 snd_pcm_uframes_t frames
)
2163 struct snd_pcm_runtime
*runtime
;
2167 err
= pcm_sanity_check(substream
);
2170 runtime
= substream
->runtime
;
2171 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2174 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2175 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2177 return snd_pcm_lib_read1(substream
, (unsigned long)bufs
, frames
, nonblock
, snd_pcm_lib_readv_transfer
);
2180 EXPORT_SYMBOL(snd_pcm_lib_readv
);