2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
24 #include <linux/slab.h>
25 #include <linux/time.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 snd_assert(frames
<= runtime
->buffer_size
, return);
92 ofs
= runtime
->silence_start
% runtime
->buffer_size
;
94 transfer
= ofs
+ frames
> runtime
->buffer_size
? runtime
->buffer_size
- ofs
: frames
;
95 if (runtime
->access
== SNDRV_PCM_ACCESS_RW_INTERLEAVED
||
96 runtime
->access
== SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
) {
97 if (substream
->ops
->silence
) {
99 err
= substream
->ops
->silence(substream
, -1, ofs
, transfer
);
100 snd_assert(err
>= 0, );
102 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, ofs
);
103 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
* runtime
->channels
);
107 unsigned int channels
= runtime
->channels
;
108 if (substream
->ops
->silence
) {
109 for (c
= 0; c
< channels
; ++c
) {
111 err
= substream
->ops
->silence(substream
, c
, ofs
, transfer
);
112 snd_assert(err
>= 0, );
115 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
116 for (c
= 0; c
< channels
; ++c
) {
117 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, ofs
);
118 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
);
122 runtime
->silence_filled
+= transfer
;
128 static void xrun(struct snd_pcm_substream
*substream
)
130 snd_pcm_stop(substream
, SNDRV_PCM_STATE_XRUN
);
131 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
132 if (substream
->pstr
->xrun_debug
) {
133 snd_printd(KERN_DEBUG
"XRUN: pcmC%dD%d%c\n",
134 substream
->pcm
->card
->number
,
135 substream
->pcm
->device
,
136 substream
->stream
? 'c' : 'p');
137 if (substream
->pstr
->xrun_debug
> 1)
143 static inline snd_pcm_uframes_t
snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream
*substream
,
144 struct snd_pcm_runtime
*runtime
)
146 snd_pcm_uframes_t pos
;
148 pos
= substream
->ops
->pointer(substream
);
149 if (pos
== SNDRV_PCM_POS_XRUN
)
150 return pos
; /* XRUN */
151 if (runtime
->tstamp_mode
& SNDRV_PCM_TSTAMP_MMAP
)
152 getnstimeofday((struct timespec
*)&runtime
->status
->tstamp
);
153 #ifdef CONFIG_SND_DEBUG
154 if (pos
>= runtime
->buffer_size
) {
155 snd_printk(KERN_ERR
"BUG: stream = %i, pos = 0x%lx, buffer size = 0x%lx, period size = 0x%lx\n", substream
->stream
, pos
, runtime
->buffer_size
, runtime
->period_size
);
158 pos
-= pos
% runtime
->min_align
;
162 static inline int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream
*substream
,
163 struct snd_pcm_runtime
*runtime
)
165 snd_pcm_uframes_t avail
;
167 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
168 avail
= snd_pcm_playback_avail(runtime
);
170 avail
= snd_pcm_capture_avail(runtime
);
171 if (avail
> runtime
->avail_max
)
172 runtime
->avail_max
= avail
;
173 if (avail
>= runtime
->stop_threshold
) {
174 if (substream
->runtime
->status
->state
== SNDRV_PCM_STATE_DRAINING
)
175 snd_pcm_drain_done(substream
);
180 if (avail
>= runtime
->control
->avail_min
)
181 wake_up(&runtime
->sleep
);
185 static inline int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream
*substream
)
187 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
188 snd_pcm_uframes_t pos
;
189 snd_pcm_uframes_t new_hw_ptr
, hw_ptr_interrupt
;
190 snd_pcm_sframes_t delta
;
192 pos
= snd_pcm_update_hw_ptr_pos(substream
, runtime
);
193 if (pos
== SNDRV_PCM_POS_XRUN
) {
197 if (runtime
->period_size
== runtime
->buffer_size
)
199 new_hw_ptr
= runtime
->hw_ptr_base
+ pos
;
200 hw_ptr_interrupt
= runtime
->hw_ptr_interrupt
+ runtime
->period_size
;
202 delta
= hw_ptr_interrupt
- new_hw_ptr
;
204 if ((snd_pcm_uframes_t
)delta
< runtime
->buffer_size
/ 2) {
205 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
206 if (runtime
->periods
> 1 && substream
->pstr
->xrun_debug
) {
207 snd_printd(KERN_ERR
"Unexpected hw_pointer value [1] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream
->stream
, (long) delta
, runtime
->buffer_size
/ 2);
208 if (substream
->pstr
->xrun_debug
> 1)
215 runtime
->hw_ptr_base
+= runtime
->buffer_size
;
216 if (runtime
->hw_ptr_base
== runtime
->boundary
)
217 runtime
->hw_ptr_base
= 0;
218 new_hw_ptr
= runtime
->hw_ptr_base
+ pos
;
221 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
222 runtime
->silence_size
> 0)
223 snd_pcm_playback_silence(substream
, new_hw_ptr
);
225 runtime
->status
->hw_ptr
= new_hw_ptr
;
226 runtime
->hw_ptr_interrupt
= new_hw_ptr
- new_hw_ptr
% runtime
->period_size
;
228 return snd_pcm_update_hw_ptr_post(substream
, runtime
);
231 /* CAUTION: call it with irq disabled */
232 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
)
234 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
235 snd_pcm_uframes_t pos
;
236 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
;
237 snd_pcm_sframes_t delta
;
239 old_hw_ptr
= runtime
->status
->hw_ptr
;
240 pos
= snd_pcm_update_hw_ptr_pos(substream
, runtime
);
241 if (pos
== SNDRV_PCM_POS_XRUN
) {
245 new_hw_ptr
= runtime
->hw_ptr_base
+ pos
;
247 delta
= old_hw_ptr
- new_hw_ptr
;
249 if ((snd_pcm_uframes_t
)delta
< runtime
->buffer_size
/ 2) {
250 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
251 if (runtime
->periods
> 2 && substream
->pstr
->xrun_debug
) {
252 snd_printd(KERN_ERR
"Unexpected hw_pointer value [2] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream
->stream
, (long) delta
, runtime
->buffer_size
/ 2);
253 if (substream
->pstr
->xrun_debug
> 1)
259 runtime
->hw_ptr_base
+= runtime
->buffer_size
;
260 if (runtime
->hw_ptr_base
== runtime
->boundary
)
261 runtime
->hw_ptr_base
= 0;
262 new_hw_ptr
= runtime
->hw_ptr_base
+ pos
;
264 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
265 runtime
->silence_size
> 0)
266 snd_pcm_playback_silence(substream
, new_hw_ptr
);
268 runtime
->status
->hw_ptr
= new_hw_ptr
;
270 return snd_pcm_update_hw_ptr_post(substream
, runtime
);
274 * snd_pcm_set_ops - set the PCM operators
275 * @pcm: the pcm instance
276 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
277 * @ops: the operator table
279 * Sets the given PCM operators to the pcm instance.
281 void snd_pcm_set_ops(struct snd_pcm
*pcm
, int direction
, struct snd_pcm_ops
*ops
)
283 struct snd_pcm_str
*stream
= &pcm
->streams
[direction
];
284 struct snd_pcm_substream
*substream
;
286 for (substream
= stream
->substream
; substream
!= NULL
; substream
= substream
->next
)
287 substream
->ops
= ops
;
290 EXPORT_SYMBOL(snd_pcm_set_ops
);
293 * snd_pcm_sync - set the PCM sync id
294 * @substream: the pcm substream
296 * Sets the PCM sync identifier for the card.
298 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
)
300 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
302 runtime
->sync
.id32
[0] = substream
->pcm
->card
->number
;
303 runtime
->sync
.id32
[1] = -1;
304 runtime
->sync
.id32
[2] = -1;
305 runtime
->sync
.id32
[3] = -1;
308 EXPORT_SYMBOL(snd_pcm_set_sync
);
311 * Standard ioctl routine
314 static inline unsigned int div32(unsigned int a
, unsigned int b
,
325 static inline unsigned int div_down(unsigned int a
, unsigned int b
)
332 static inline unsigned int div_up(unsigned int a
, unsigned int b
)
344 static inline unsigned int mul(unsigned int a
, unsigned int b
)
348 if (div_down(UINT_MAX
, a
) < b
)
353 static inline unsigned int muldiv32(unsigned int a
, unsigned int b
,
354 unsigned int c
, unsigned int *r
)
356 u_int64_t n
= (u_int64_t
) a
* b
;
371 * snd_interval_refine - refine the interval value of configurator
372 * @i: the interval value to refine
373 * @v: the interval value to refer to
375 * Refines the interval value with the reference value.
376 * The interval is changed to the range satisfying both intervals.
377 * The interval status (min, max, integer, etc.) are evaluated.
379 * Returns non-zero if the value is changed, zero if not changed.
381 int snd_interval_refine(struct snd_interval
*i
, const struct snd_interval
*v
)
384 snd_assert(!snd_interval_empty(i
), return -EINVAL
);
385 if (i
->min
< v
->min
) {
387 i
->openmin
= v
->openmin
;
389 } else if (i
->min
== v
->min
&& !i
->openmin
&& v
->openmin
) {
393 if (i
->max
> v
->max
) {
395 i
->openmax
= v
->openmax
;
397 } else if (i
->max
== v
->max
&& !i
->openmax
&& v
->openmax
) {
401 if (!i
->integer
&& v
->integer
) {
414 } else if (!i
->openmin
&& !i
->openmax
&& i
->min
== i
->max
)
416 if (snd_interval_checkempty(i
)) {
417 snd_interval_none(i
);
423 EXPORT_SYMBOL(snd_interval_refine
);
425 static int snd_interval_refine_first(struct snd_interval
*i
)
427 snd_assert(!snd_interval_empty(i
), return -EINVAL
);
428 if (snd_interval_single(i
))
431 i
->openmax
= i
->openmin
;
437 static int snd_interval_refine_last(struct snd_interval
*i
)
439 snd_assert(!snd_interval_empty(i
), return -EINVAL
);
440 if (snd_interval_single(i
))
443 i
->openmin
= i
->openmax
;
449 void snd_interval_mul(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
451 if (a
->empty
|| b
->empty
) {
452 snd_interval_none(c
);
456 c
->min
= mul(a
->min
, b
->min
);
457 c
->openmin
= (a
->openmin
|| b
->openmin
);
458 c
->max
= mul(a
->max
, b
->max
);
459 c
->openmax
= (a
->openmax
|| b
->openmax
);
460 c
->integer
= (a
->integer
&& b
->integer
);
464 * snd_interval_div - refine the interval value with division
471 * Returns non-zero if the value is changed, zero if not changed.
473 void snd_interval_div(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
476 if (a
->empty
|| b
->empty
) {
477 snd_interval_none(c
);
481 c
->min
= div32(a
->min
, b
->max
, &r
);
482 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
484 c
->max
= div32(a
->max
, b
->min
, &r
);
489 c
->openmax
= (a
->openmax
|| b
->openmin
);
498 * snd_interval_muldivk - refine the interval value
501 * @k: divisor (as integer)
506 * Returns non-zero if the value is changed, zero if not changed.
508 void snd_interval_muldivk(const struct snd_interval
*a
, const struct snd_interval
*b
,
509 unsigned int k
, struct snd_interval
*c
)
512 if (a
->empty
|| b
->empty
) {
513 snd_interval_none(c
);
517 c
->min
= muldiv32(a
->min
, b
->min
, k
, &r
);
518 c
->openmin
= (r
|| a
->openmin
|| b
->openmin
);
519 c
->max
= muldiv32(a
->max
, b
->max
, k
, &r
);
524 c
->openmax
= (a
->openmax
|| b
->openmax
);
529 * snd_interval_mulkdiv - refine the interval value
531 * @k: dividend 2 (as integer)
537 * Returns non-zero if the value is changed, zero if not changed.
539 void snd_interval_mulkdiv(const struct snd_interval
*a
, unsigned int k
,
540 const struct snd_interval
*b
, struct snd_interval
*c
)
543 if (a
->empty
|| b
->empty
) {
544 snd_interval_none(c
);
548 c
->min
= muldiv32(a
->min
, k
, b
->max
, &r
);
549 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
551 c
->max
= muldiv32(a
->max
, k
, b
->min
, &r
);
556 c
->openmax
= (a
->openmax
|| b
->openmin
);
568 * snd_interval_ratnum - refine the interval value
569 * @i: interval to refine
570 * @rats_count: number of ratnum_t
571 * @rats: ratnum_t array
572 * @nump: pointer to store the resultant numerator
573 * @denp: pointer to store the resultant denominator
575 * Returns non-zero if the value is changed, zero if not changed.
577 int snd_interval_ratnum(struct snd_interval
*i
,
578 unsigned int rats_count
, struct snd_ratnum
*rats
,
579 unsigned int *nump
, unsigned int *denp
)
581 unsigned int best_num
, best_diff
, best_den
;
583 struct snd_interval t
;
586 best_num
= best_den
= best_diff
= 0;
587 for (k
= 0; k
< rats_count
; ++k
) {
588 unsigned int num
= rats
[k
].num
;
590 unsigned int q
= i
->min
;
594 den
= div_down(num
, q
);
595 if (den
< rats
[k
].den_min
)
597 if (den
> rats
[k
].den_max
)
598 den
= rats
[k
].den_max
;
601 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
605 diff
= num
- q
* den
;
607 diff
* best_den
< best_diff
* den
) {
617 t
.min
= div_down(best_num
, best_den
);
618 t
.openmin
= !!(best_num
% best_den
);
620 best_num
= best_den
= best_diff
= 0;
621 for (k
= 0; k
< rats_count
; ++k
) {
622 unsigned int num
= rats
[k
].num
;
624 unsigned int q
= i
->max
;
630 den
= div_up(num
, q
);
631 if (den
> rats
[k
].den_max
)
633 if (den
< rats
[k
].den_min
)
634 den
= rats
[k
].den_min
;
637 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
639 den
+= rats
[k
].den_step
- r
;
641 diff
= q
* den
- num
;
643 diff
* best_den
< best_diff
* den
) {
653 t
.max
= div_up(best_num
, best_den
);
654 t
.openmax
= !!(best_num
% best_den
);
656 err
= snd_interval_refine(i
, &t
);
660 if (snd_interval_single(i
)) {
669 EXPORT_SYMBOL(snd_interval_ratnum
);
672 * snd_interval_ratden - refine the interval value
673 * @i: interval to refine
674 * @rats_count: number of struct ratden
675 * @rats: struct ratden array
676 * @nump: pointer to store the resultant numerator
677 * @denp: pointer to store the resultant denominator
679 * Returns non-zero if the value is changed, zero if not changed.
681 static int snd_interval_ratden(struct snd_interval
*i
,
682 unsigned int rats_count
, struct snd_ratden
*rats
,
683 unsigned int *nump
, unsigned int *denp
)
685 unsigned int best_num
, best_diff
, best_den
;
687 struct snd_interval t
;
690 best_num
= best_den
= best_diff
= 0;
691 for (k
= 0; k
< rats_count
; ++k
) {
693 unsigned int den
= rats
[k
].den
;
694 unsigned int q
= i
->min
;
697 if (num
> rats
[k
].num_max
)
699 if (num
< rats
[k
].num_min
)
700 num
= rats
[k
].num_max
;
703 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
705 num
+= rats
[k
].num_step
- r
;
707 diff
= num
- q
* den
;
709 diff
* best_den
< best_diff
* den
) {
719 t
.min
= div_down(best_num
, best_den
);
720 t
.openmin
= !!(best_num
% best_den
);
722 best_num
= best_den
= best_diff
= 0;
723 for (k
= 0; k
< rats_count
; ++k
) {
725 unsigned int den
= rats
[k
].den
;
726 unsigned int q
= i
->max
;
729 if (num
< rats
[k
].num_min
)
731 if (num
> rats
[k
].num_max
)
732 num
= rats
[k
].num_max
;
735 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
739 diff
= q
* den
- num
;
741 diff
* best_den
< best_diff
* den
) {
751 t
.max
= div_up(best_num
, best_den
);
752 t
.openmax
= !!(best_num
% best_den
);
754 err
= snd_interval_refine(i
, &t
);
758 if (snd_interval_single(i
)) {
768 * snd_interval_list - refine the interval value from the list
769 * @i: the interval value to refine
770 * @count: the number of elements in the list
771 * @list: the value list
772 * @mask: the bit-mask to evaluate
774 * Refines the interval value from the list.
775 * When mask is non-zero, only the elements corresponding to bit 1 are
778 * Returns non-zero if the value is changed, zero if not changed.
780 int snd_interval_list(struct snd_interval
*i
, unsigned int count
, unsigned int *list
, unsigned int mask
)
784 for (k
= 0; k
< count
; k
++) {
785 if (mask
&& !(mask
& (1 << k
)))
787 if (i
->min
== list
[k
] && !i
->openmin
)
789 if (i
->min
< list
[k
]) {
799 for (k
= count
; k
-- > 0;) {
800 if (mask
&& !(mask
& (1 << k
)))
802 if (i
->max
== list
[k
] && !i
->openmax
)
804 if (i
->max
> list
[k
]) {
814 if (snd_interval_checkempty(i
)) {
821 EXPORT_SYMBOL(snd_interval_list
);
823 static int snd_interval_step(struct snd_interval
*i
, unsigned int min
, unsigned int step
)
827 n
= (i
->min
- min
) % step
;
828 if (n
!= 0 || i
->openmin
) {
832 n
= (i
->max
- min
) % step
;
833 if (n
!= 0 || i
->openmax
) {
837 if (snd_interval_checkempty(i
)) {
844 /* Info constraints helpers */
847 * snd_pcm_hw_rule_add - add the hw-constraint rule
848 * @runtime: the pcm runtime instance
849 * @cond: condition bits
850 * @var: the variable to evaluate
851 * @func: the evaluation function
852 * @private: the private data pointer passed to function
853 * @dep: the dependent variables
855 * Returns zero if successful, or a negative error code on failure.
857 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
, unsigned int cond
,
859 snd_pcm_hw_rule_func_t func
, void *private,
862 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
863 struct snd_pcm_hw_rule
*c
;
867 if (constrs
->rules_num
>= constrs
->rules_all
) {
868 struct snd_pcm_hw_rule
*new;
869 unsigned int new_rules
= constrs
->rules_all
+ 16;
870 new = kcalloc(new_rules
, sizeof(*c
), GFP_KERNEL
);
873 if (constrs
->rules
) {
874 memcpy(new, constrs
->rules
,
875 constrs
->rules_num
* sizeof(*c
));
876 kfree(constrs
->rules
);
878 constrs
->rules
= new;
879 constrs
->rules_all
= new_rules
;
881 c
= &constrs
->rules
[constrs
->rules_num
];
885 c
->private = private;
888 snd_assert(k
< ARRAY_SIZE(c
->deps
), return -EINVAL
);
892 dep
= va_arg(args
, int);
894 constrs
->rules_num
++;
899 EXPORT_SYMBOL(snd_pcm_hw_rule_add
);
902 * snd_pcm_hw_constraint_mask
903 * @runtime: PCM runtime instance
904 * @var: hw_params variable to apply the mask
905 * @mask: the bitmap mask
907 * Apply the constraint of the given bitmap mask to a mask parameter.
909 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
912 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
913 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
914 *maskp
->bits
&= mask
;
915 memset(maskp
->bits
+ 1, 0, (SNDRV_MASK_MAX
-32) / 8); /* clear rest */
916 if (*maskp
->bits
== 0)
922 * snd_pcm_hw_constraint_mask64
923 * @runtime: PCM runtime instance
924 * @var: hw_params variable to apply the mask
925 * @mask: the 64bit bitmap mask
927 * Apply the constraint of the given bitmap mask to a mask parameter.
929 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
932 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
933 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
934 maskp
->bits
[0] &= (u_int32_t
)mask
;
935 maskp
->bits
[1] &= (u_int32_t
)(mask
>> 32);
936 memset(maskp
->bits
+ 2, 0, (SNDRV_MASK_MAX
-64) / 8); /* clear rest */
937 if (! maskp
->bits
[0] && ! maskp
->bits
[1])
943 * snd_pcm_hw_constraint_integer
944 * @runtime: PCM runtime instance
945 * @var: hw_params variable to apply the integer constraint
947 * Apply the constraint of integer to an interval parameter.
949 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
)
951 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
952 return snd_interval_setinteger(constrs_interval(constrs
, var
));
955 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer
);
958 * snd_pcm_hw_constraint_minmax
959 * @runtime: PCM runtime instance
960 * @var: hw_params variable to apply the range
961 * @min: the minimal value
962 * @max: the maximal value
964 * Apply the min/max range constraint to an interval parameter.
966 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
967 unsigned int min
, unsigned int max
)
969 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
970 struct snd_interval t
;
973 t
.openmin
= t
.openmax
= 0;
975 return snd_interval_refine(constrs_interval(constrs
, var
), &t
);
978 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax
);
980 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params
*params
,
981 struct snd_pcm_hw_rule
*rule
)
983 struct snd_pcm_hw_constraint_list
*list
= rule
->private;
984 return snd_interval_list(hw_param_interval(params
, rule
->var
), list
->count
, list
->list
, list
->mask
);
989 * snd_pcm_hw_constraint_list
990 * @runtime: PCM runtime instance
991 * @cond: condition bits
992 * @var: hw_params variable to apply the list constraint
995 * Apply the list of constraints to an interval parameter.
997 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
999 snd_pcm_hw_param_t var
,
1000 struct snd_pcm_hw_constraint_list
*l
)
1002 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1003 snd_pcm_hw_rule_list
, l
,
1007 EXPORT_SYMBOL(snd_pcm_hw_constraint_list
);
1009 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params
*params
,
1010 struct snd_pcm_hw_rule
*rule
)
1012 struct snd_pcm_hw_constraint_ratnums
*r
= rule
->private;
1013 unsigned int num
= 0, den
= 0;
1015 err
= snd_interval_ratnum(hw_param_interval(params
, rule
->var
),
1016 r
->nrats
, r
->rats
, &num
, &den
);
1017 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1018 params
->rate_num
= num
;
1019 params
->rate_den
= den
;
1025 * snd_pcm_hw_constraint_ratnums
1026 * @runtime: PCM runtime instance
1027 * @cond: condition bits
1028 * @var: hw_params variable to apply the ratnums constraint
1029 * @r: struct snd_ratnums constriants
1031 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
1033 snd_pcm_hw_param_t var
,
1034 struct snd_pcm_hw_constraint_ratnums
*r
)
1036 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1037 snd_pcm_hw_rule_ratnums
, r
,
1041 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums
);
1043 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params
*params
,
1044 struct snd_pcm_hw_rule
*rule
)
1046 struct snd_pcm_hw_constraint_ratdens
*r
= rule
->private;
1047 unsigned int num
= 0, den
= 0;
1048 int err
= snd_interval_ratden(hw_param_interval(params
, rule
->var
),
1049 r
->nrats
, r
->rats
, &num
, &den
);
1050 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1051 params
->rate_num
= num
;
1052 params
->rate_den
= den
;
1058 * snd_pcm_hw_constraint_ratdens
1059 * @runtime: PCM runtime instance
1060 * @cond: condition bits
1061 * @var: hw_params variable to apply the ratdens constraint
1062 * @r: struct snd_ratdens constriants
1064 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
1066 snd_pcm_hw_param_t var
,
1067 struct snd_pcm_hw_constraint_ratdens
*r
)
1069 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1070 snd_pcm_hw_rule_ratdens
, r
,
1074 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens
);
1076 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params
*params
,
1077 struct snd_pcm_hw_rule
*rule
)
1079 unsigned int l
= (unsigned long) rule
->private;
1080 int width
= l
& 0xffff;
1081 unsigned int msbits
= l
>> 16;
1082 struct snd_interval
*i
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_SAMPLE_BITS
);
1083 if (snd_interval_single(i
) && snd_interval_value(i
) == width
)
1084 params
->msbits
= msbits
;
1089 * snd_pcm_hw_constraint_msbits
1090 * @runtime: PCM runtime instance
1091 * @cond: condition bits
1092 * @width: sample bits width
1093 * @msbits: msbits width
1095 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
1098 unsigned int msbits
)
1100 unsigned long l
= (msbits
<< 16) | width
;
1101 return snd_pcm_hw_rule_add(runtime
, cond
, -1,
1102 snd_pcm_hw_rule_msbits
,
1104 SNDRV_PCM_HW_PARAM_SAMPLE_BITS
, -1);
1107 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits
);
1109 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params
*params
,
1110 struct snd_pcm_hw_rule
*rule
)
1112 unsigned long step
= (unsigned long) rule
->private;
1113 return snd_interval_step(hw_param_interval(params
, rule
->var
), 0, step
);
1117 * snd_pcm_hw_constraint_step
1118 * @runtime: PCM runtime instance
1119 * @cond: condition bits
1120 * @var: hw_params variable to apply the step constraint
1123 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
1125 snd_pcm_hw_param_t var
,
1128 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1129 snd_pcm_hw_rule_step
, (void *) step
,
1133 EXPORT_SYMBOL(snd_pcm_hw_constraint_step
);
1135 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params
*params
, struct snd_pcm_hw_rule
*rule
)
1137 static int pow2_sizes
[] = {
1138 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1139 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1140 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1141 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1143 return snd_interval_list(hw_param_interval(params
, rule
->var
),
1144 ARRAY_SIZE(pow2_sizes
), pow2_sizes
, 0);
1148 * snd_pcm_hw_constraint_pow2
1149 * @runtime: PCM runtime instance
1150 * @cond: condition bits
1151 * @var: hw_params variable to apply the power-of-2 constraint
1153 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
1155 snd_pcm_hw_param_t var
)
1157 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1158 snd_pcm_hw_rule_pow2
, NULL
,
1162 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2
);
1164 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params
*params
,
1165 snd_pcm_hw_param_t var
)
1167 if (hw_is_mask(var
)) {
1168 snd_mask_any(hw_param_mask(params
, var
));
1169 params
->cmask
|= 1 << var
;
1170 params
->rmask
|= 1 << var
;
1173 if (hw_is_interval(var
)) {
1174 snd_interval_any(hw_param_interval(params
, var
));
1175 params
->cmask
|= 1 << var
;
1176 params
->rmask
|= 1 << var
;
1182 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
)
1185 memset(params
, 0, sizeof(*params
));
1186 for (k
= SNDRV_PCM_HW_PARAM_FIRST_MASK
; k
<= SNDRV_PCM_HW_PARAM_LAST_MASK
; k
++)
1187 _snd_pcm_hw_param_any(params
, k
);
1188 for (k
= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
; k
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
; k
++)
1189 _snd_pcm_hw_param_any(params
, k
);
1193 EXPORT_SYMBOL(_snd_pcm_hw_params_any
);
1196 * snd_pcm_hw_param_value
1197 * @params: the hw_params instance
1198 * @var: parameter to retrieve
1199 * @dir: pointer to the direction (-1,0,1) or NULL
1201 * Return the value for field PAR if it's fixed in configuration space
1202 * defined by PARAMS. Return -EINVAL otherwise
1204 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
1205 snd_pcm_hw_param_t var
, int *dir
)
1207 if (hw_is_mask(var
)) {
1208 const struct snd_mask
*mask
= hw_param_mask_c(params
, var
);
1209 if (!snd_mask_single(mask
))
1213 return snd_mask_value(mask
);
1215 if (hw_is_interval(var
)) {
1216 const struct snd_interval
*i
= hw_param_interval_c(params
, var
);
1217 if (!snd_interval_single(i
))
1221 return snd_interval_value(i
);
1226 EXPORT_SYMBOL(snd_pcm_hw_param_value
);
1228 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
,
1229 snd_pcm_hw_param_t var
)
1231 if (hw_is_mask(var
)) {
1232 snd_mask_none(hw_param_mask(params
, var
));
1233 params
->cmask
|= 1 << var
;
1234 params
->rmask
|= 1 << var
;
1235 } else if (hw_is_interval(var
)) {
1236 snd_interval_none(hw_param_interval(params
, var
));
1237 params
->cmask
|= 1 << var
;
1238 params
->rmask
|= 1 << var
;
1244 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty
);
1246 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params
*params
,
1247 snd_pcm_hw_param_t var
)
1250 if (hw_is_mask(var
))
1251 changed
= snd_mask_refine_first(hw_param_mask(params
, var
));
1252 else if (hw_is_interval(var
))
1253 changed
= snd_interval_refine_first(hw_param_interval(params
, var
));
1257 params
->cmask
|= 1 << var
;
1258 params
->rmask
|= 1 << var
;
1265 * snd_pcm_hw_param_first
1266 * @pcm: PCM instance
1267 * @params: the hw_params instance
1268 * @var: parameter to retrieve
1269 * @dir: pointer to the direction (-1,0,1) or NULL
1271 * Inside configuration space defined by PARAMS remove from PAR all
1272 * values > minimum. Reduce configuration space accordingly.
1273 * Return the minimum.
1275 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
1276 struct snd_pcm_hw_params
*params
,
1277 snd_pcm_hw_param_t var
, int *dir
)
1279 int changed
= _snd_pcm_hw_param_first(params
, var
);
1282 if (params
->rmask
) {
1283 int err
= snd_pcm_hw_refine(pcm
, params
);
1284 snd_assert(err
>= 0, return err
);
1286 return snd_pcm_hw_param_value(params
, var
, dir
);
1289 EXPORT_SYMBOL(snd_pcm_hw_param_first
);
1291 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params
*params
,
1292 snd_pcm_hw_param_t var
)
1295 if (hw_is_mask(var
))
1296 changed
= snd_mask_refine_last(hw_param_mask(params
, var
));
1297 else if (hw_is_interval(var
))
1298 changed
= snd_interval_refine_last(hw_param_interval(params
, var
));
1302 params
->cmask
|= 1 << var
;
1303 params
->rmask
|= 1 << var
;
1310 * snd_pcm_hw_param_last
1311 * @pcm: PCM instance
1312 * @params: the hw_params instance
1313 * @var: parameter to retrieve
1314 * @dir: pointer to the direction (-1,0,1) or NULL
1316 * Inside configuration space defined by PARAMS remove from PAR all
1317 * values < maximum. Reduce configuration space accordingly.
1318 * Return the maximum.
1320 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
1321 struct snd_pcm_hw_params
*params
,
1322 snd_pcm_hw_param_t var
, int *dir
)
1324 int changed
= _snd_pcm_hw_param_last(params
, var
);
1327 if (params
->rmask
) {
1328 int err
= snd_pcm_hw_refine(pcm
, params
);
1329 snd_assert(err
>= 0, return err
);
1331 return snd_pcm_hw_param_value(params
, var
, dir
);
1334 EXPORT_SYMBOL(snd_pcm_hw_param_last
);
1337 * snd_pcm_hw_param_choose
1338 * @pcm: PCM instance
1339 * @params: the hw_params instance
1341 * Choose one configuration from configuration space defined by PARAMS
1342 * The configuration chosen is that obtained fixing in this order:
1343 * first access, first format, first subformat, min channels,
1344 * min rate, min period time, max buffer size, min tick time
1346 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*pcm
,
1347 struct snd_pcm_hw_params
*params
)
1349 static int vars
[] = {
1350 SNDRV_PCM_HW_PARAM_ACCESS
,
1351 SNDRV_PCM_HW_PARAM_FORMAT
,
1352 SNDRV_PCM_HW_PARAM_SUBFORMAT
,
1353 SNDRV_PCM_HW_PARAM_CHANNELS
,
1354 SNDRV_PCM_HW_PARAM_RATE
,
1355 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1356 SNDRV_PCM_HW_PARAM_BUFFER_SIZE
,
1357 SNDRV_PCM_HW_PARAM_TICK_TIME
,
1362 for (v
= vars
; *v
!= -1; v
++) {
1363 if (*v
!= SNDRV_PCM_HW_PARAM_BUFFER_SIZE
)
1364 err
= snd_pcm_hw_param_first(pcm
, params
, *v
, NULL
);
1366 err
= snd_pcm_hw_param_last(pcm
, params
, *v
, NULL
);
1367 snd_assert(err
>= 0, return err
);
1372 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream
*substream
,
1375 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1376 unsigned long flags
;
1377 snd_pcm_stream_lock_irqsave(substream
, flags
);
1378 if (snd_pcm_running(substream
) &&
1379 snd_pcm_update_hw_ptr(substream
) >= 0)
1380 runtime
->status
->hw_ptr
%= runtime
->buffer_size
;
1382 runtime
->status
->hw_ptr
= 0;
1383 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1387 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream
*substream
,
1390 struct snd_pcm_channel_info
*info
= arg
;
1391 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1393 if (!(runtime
->info
& SNDRV_PCM_INFO_MMAP
)) {
1397 width
= snd_pcm_format_physical_width(runtime
->format
);
1401 switch (runtime
->access
) {
1402 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
:
1403 case SNDRV_PCM_ACCESS_RW_INTERLEAVED
:
1404 info
->first
= info
->channel
* width
;
1405 info
->step
= runtime
->channels
* width
;
1407 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED
:
1408 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
:
1410 size_t size
= runtime
->dma_bytes
/ runtime
->channels
;
1411 info
->first
= info
->channel
* size
* 8;
1423 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1424 * @substream: the pcm substream instance
1425 * @cmd: ioctl command
1426 * @arg: ioctl argument
1428 * Processes the generic ioctl commands for PCM.
1429 * Can be passed as the ioctl callback for PCM ops.
1431 * Returns zero if successful, or a negative error code on failure.
1433 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
1434 unsigned int cmd
, void *arg
)
1437 case SNDRV_PCM_IOCTL1_INFO
:
1439 case SNDRV_PCM_IOCTL1_RESET
:
1440 return snd_pcm_lib_ioctl_reset(substream
, arg
);
1441 case SNDRV_PCM_IOCTL1_CHANNEL_INFO
:
1442 return snd_pcm_lib_ioctl_channel_info(substream
, arg
);
1447 EXPORT_SYMBOL(snd_pcm_lib_ioctl
);
1453 static void snd_pcm_system_tick_set(struct snd_pcm_substream
*substream
,
1454 unsigned long ticks
)
1456 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1458 del_timer(&runtime
->tick_timer
);
1460 ticks
+= (1000000 / HZ
) - 1;
1461 ticks
/= (1000000 / HZ
);
1462 mod_timer(&runtime
->tick_timer
, jiffies
+ ticks
);
1466 /* Temporary alias */
1467 void snd_pcm_tick_set(struct snd_pcm_substream
*substream
, unsigned long ticks
)
1469 snd_pcm_system_tick_set(substream
, ticks
);
1472 void snd_pcm_tick_prepare(struct snd_pcm_substream
*substream
)
1474 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1475 snd_pcm_uframes_t frames
= ULONG_MAX
;
1476 snd_pcm_uframes_t avail
, dist
;
1480 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
) {
1481 if (runtime
->silence_size
>= runtime
->boundary
) {
1483 } else if (runtime
->silence_size
> 0 &&
1484 runtime
->silence_filled
< runtime
->buffer_size
) {
1485 snd_pcm_sframes_t noise_dist
;
1486 noise_dist
= snd_pcm_playback_hw_avail(runtime
) + runtime
->silence_filled
;
1487 if (noise_dist
> (snd_pcm_sframes_t
)runtime
->silence_threshold
)
1488 frames
= noise_dist
- runtime
->silence_threshold
;
1490 avail
= snd_pcm_playback_avail(runtime
);
1492 avail
= snd_pcm_capture_avail(runtime
);
1494 if (avail
< runtime
->control
->avail_min
) {
1495 snd_pcm_sframes_t n
= runtime
->control
->avail_min
- avail
;
1496 if (n
> 0 && frames
> (snd_pcm_uframes_t
)n
)
1499 if (avail
< runtime
->buffer_size
) {
1500 snd_pcm_sframes_t n
= runtime
->buffer_size
- avail
;
1501 if (n
> 0 && frames
> (snd_pcm_uframes_t
)n
)
1504 if (frames
== ULONG_MAX
) {
1505 snd_pcm_tick_set(substream
, 0);
1508 dist
= runtime
->status
->hw_ptr
- runtime
->hw_ptr_base
;
1509 /* Distance to next interrupt */
1510 dist
= runtime
->period_size
- dist
% runtime
->period_size
;
1511 if (dist
<= frames
) {
1512 snd_pcm_tick_set(substream
, 0);
1515 /* the base time is us */
1518 div64_32(&n
, runtime
->tick_time
* runtime
->rate
, &r
);
1519 ticks
= n
+ (r
> 0 ? 1 : 0);
1520 if (ticks
< runtime
->sleep_min
)
1521 ticks
= runtime
->sleep_min
;
1522 snd_pcm_tick_set(substream
, (unsigned long) ticks
);
1525 void snd_pcm_tick_elapsed(struct snd_pcm_substream
*substream
)
1527 struct snd_pcm_runtime
*runtime
;
1528 unsigned long flags
;
1530 snd_assert(substream
!= NULL
, return);
1531 runtime
= substream
->runtime
;
1532 snd_assert(runtime
!= NULL
, return);
1534 snd_pcm_stream_lock_irqsave(substream
, flags
);
1535 if (!snd_pcm_running(substream
) ||
1536 snd_pcm_update_hw_ptr(substream
) < 0)
1538 if (runtime
->sleep_min
)
1539 snd_pcm_tick_prepare(substream
);
1541 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1545 * snd_pcm_period_elapsed - update the pcm status for the next period
1546 * @substream: the pcm substream instance
1548 * This function is called from the interrupt handler when the
1549 * PCM has processed the period size. It will update the current
1550 * pointer, set up the tick, wake up sleepers, etc.
1552 * Even if more than one periods have elapsed since the last call, you
1553 * have to call this only once.
1555 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
)
1557 struct snd_pcm_runtime
*runtime
;
1558 unsigned long flags
;
1560 snd_assert(substream
!= NULL
, return);
1561 runtime
= substream
->runtime
;
1562 snd_assert(runtime
!= NULL
, return);
1564 if (runtime
->transfer_ack_begin
)
1565 runtime
->transfer_ack_begin(substream
);
1567 snd_pcm_stream_lock_irqsave(substream
, flags
);
1568 if (!snd_pcm_running(substream
) ||
1569 snd_pcm_update_hw_ptr_interrupt(substream
) < 0)
1572 if (substream
->timer_running
)
1573 snd_timer_interrupt(substream
->timer
, 1);
1574 if (runtime
->sleep_min
)
1575 snd_pcm_tick_prepare(substream
);
1577 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1578 if (runtime
->transfer_ack_end
)
1579 runtime
->transfer_ack_end(substream
);
1580 kill_fasync(&runtime
->fasync
, SIGIO
, POLL_IN
);
1583 EXPORT_SYMBOL(snd_pcm_period_elapsed
);
1585 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream
*substream
,
1587 unsigned long data
, unsigned int off
,
1588 snd_pcm_uframes_t frames
)
1590 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1592 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1593 if (substream
->ops
->copy
) {
1594 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1597 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1598 snd_assert(runtime
->dma_area
, return -EFAULT
);
1599 if (copy_from_user(hwbuf
, buf
, frames_to_bytes(runtime
, frames
)))
1605 typedef int (*transfer_f
)(struct snd_pcm_substream
*substream
, unsigned int hwoff
,
1606 unsigned long data
, unsigned int off
,
1607 snd_pcm_uframes_t size
);
1609 static snd_pcm_sframes_t
snd_pcm_lib_write1(struct snd_pcm_substream
*substream
,
1611 snd_pcm_uframes_t size
,
1613 transfer_f transfer
)
1615 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1616 snd_pcm_uframes_t xfer
= 0;
1617 snd_pcm_uframes_t offset
= 0;
1622 if (size
> runtime
->xfer_align
)
1623 size
-= size
% runtime
->xfer_align
;
1625 snd_pcm_stream_lock_irq(substream
);
1626 switch (runtime
->status
->state
) {
1627 case SNDRV_PCM_STATE_PREPARED
:
1628 case SNDRV_PCM_STATE_RUNNING
:
1629 case SNDRV_PCM_STATE_PAUSED
:
1631 case SNDRV_PCM_STATE_XRUN
:
1634 case SNDRV_PCM_STATE_SUSPENDED
:
1643 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1644 snd_pcm_uframes_t avail
;
1645 snd_pcm_uframes_t cont
;
1646 if (runtime
->sleep_min
== 0 && runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1647 snd_pcm_update_hw_ptr(substream
);
1648 avail
= snd_pcm_playback_avail(runtime
);
1649 if (((avail
< runtime
->control
->avail_min
&& size
> avail
) ||
1650 (size
>= runtime
->xfer_align
&& avail
< runtime
->xfer_align
))) {
1652 enum { READY
, SIGNALED
, ERROR
, SUSPENDED
, EXPIRED
, DROPPED
} state
;
1660 init_waitqueue_entry(&wait
, current
);
1661 add_wait_queue(&runtime
->sleep
, &wait
);
1663 if (signal_pending(current
)) {
1667 set_current_state(TASK_INTERRUPTIBLE
);
1668 snd_pcm_stream_unlock_irq(substream
);
1669 tout
= schedule_timeout(10 * HZ
);
1670 snd_pcm_stream_lock_irq(substream
);
1672 if (runtime
->status
->state
!= SNDRV_PCM_STATE_PREPARED
&&
1673 runtime
->status
->state
!= SNDRV_PCM_STATE_PAUSED
) {
1674 state
= runtime
->status
->state
== SNDRV_PCM_STATE_SUSPENDED
? SUSPENDED
: EXPIRED
;
1678 switch (runtime
->status
->state
) {
1679 case SNDRV_PCM_STATE_XRUN
:
1680 case SNDRV_PCM_STATE_DRAINING
:
1683 case SNDRV_PCM_STATE_SUSPENDED
:
1686 case SNDRV_PCM_STATE_SETUP
:
1692 avail
= snd_pcm_playback_avail(runtime
);
1693 if (avail
>= runtime
->control
->avail_min
) {
1699 remove_wait_queue(&runtime
->sleep
, &wait
);
1712 snd_printd("playback write error (DMA or IRQ trouble?)\n");
1722 if (avail
> runtime
->xfer_align
)
1723 avail
-= avail
% runtime
->xfer_align
;
1724 frames
= size
> avail
? avail
: size
;
1725 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
1728 snd_assert(frames
!= 0, snd_pcm_stream_unlock_irq(substream
); return -EINVAL
);
1729 appl_ptr
= runtime
->control
->appl_ptr
;
1730 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
1731 snd_pcm_stream_unlock_irq(substream
);
1732 if ((err
= transfer(substream
, appl_ofs
, data
, offset
, frames
)) < 0)
1734 snd_pcm_stream_lock_irq(substream
);
1735 switch (runtime
->status
->state
) {
1736 case SNDRV_PCM_STATE_XRUN
:
1739 case SNDRV_PCM_STATE_SUSPENDED
:
1746 if (appl_ptr
>= runtime
->boundary
)
1747 appl_ptr
-= runtime
->boundary
;
1748 runtime
->control
->appl_ptr
= appl_ptr
;
1749 if (substream
->ops
->ack
)
1750 substream
->ops
->ack(substream
);
1755 if (runtime
->status
->state
== SNDRV_PCM_STATE_PREPARED
&&
1756 snd_pcm_playback_hw_avail(runtime
) >= (snd_pcm_sframes_t
)runtime
->start_threshold
) {
1757 err
= snd_pcm_start(substream
);
1761 if (runtime
->sleep_min
&&
1762 runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1763 snd_pcm_tick_prepare(substream
);
1766 snd_pcm_stream_unlock_irq(substream
);
1768 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
1771 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
, const void __user
*buf
, snd_pcm_uframes_t size
)
1773 struct snd_pcm_runtime
*runtime
;
1776 snd_assert(substream
!= NULL
, return -ENXIO
);
1777 runtime
= substream
->runtime
;
1778 snd_assert(runtime
!= NULL
, return -ENXIO
);
1779 snd_assert(substream
->ops
->copy
!= NULL
|| runtime
->dma_area
!= NULL
, return -EINVAL
);
1780 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
1783 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1785 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
&&
1786 runtime
->channels
> 1)
1788 return snd_pcm_lib_write1(substream
, (unsigned long)buf
, size
, nonblock
,
1789 snd_pcm_lib_write_transfer
);
1792 EXPORT_SYMBOL(snd_pcm_lib_write
);
1794 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream
*substream
,
1796 unsigned long data
, unsigned int off
,
1797 snd_pcm_uframes_t frames
)
1799 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1801 void __user
**bufs
= (void __user
**)data
;
1802 int channels
= runtime
->channels
;
1804 if (substream
->ops
->copy
) {
1805 snd_assert(substream
->ops
->silence
!= NULL
, return -EINVAL
);
1806 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1807 if (*bufs
== NULL
) {
1808 if ((err
= substream
->ops
->silence(substream
, c
, hwoff
, frames
)) < 0)
1811 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1812 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
1817 /* default transfer behaviour */
1818 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
1819 snd_assert(runtime
->dma_area
, return -EFAULT
);
1820 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1821 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
1822 if (*bufs
== NULL
) {
1823 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, frames
);
1825 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1826 if (copy_from_user(hwbuf
, buf
, samples_to_bytes(runtime
, frames
)))
1834 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
1836 snd_pcm_uframes_t frames
)
1838 struct snd_pcm_runtime
*runtime
;
1841 snd_assert(substream
!= NULL
, return -ENXIO
);
1842 runtime
= substream
->runtime
;
1843 snd_assert(runtime
!= NULL
, return -ENXIO
);
1844 snd_assert(substream
->ops
->copy
!= NULL
|| runtime
->dma_area
!= NULL
, return -EINVAL
);
1845 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
1848 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1850 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
1852 return snd_pcm_lib_write1(substream
, (unsigned long)bufs
, frames
,
1853 nonblock
, snd_pcm_lib_writev_transfer
);
1856 EXPORT_SYMBOL(snd_pcm_lib_writev
);
1858 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream
*substream
,
1860 unsigned long data
, unsigned int off
,
1861 snd_pcm_uframes_t frames
)
1863 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1865 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1866 if (substream
->ops
->copy
) {
1867 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1870 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1871 snd_assert(runtime
->dma_area
, return -EFAULT
);
1872 if (copy_to_user(buf
, hwbuf
, frames_to_bytes(runtime
, frames
)))
1878 static snd_pcm_sframes_t
snd_pcm_lib_read1(struct snd_pcm_substream
*substream
,
1880 snd_pcm_uframes_t size
,
1882 transfer_f transfer
)
1884 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1885 snd_pcm_uframes_t xfer
= 0;
1886 snd_pcm_uframes_t offset
= 0;
1891 if (size
> runtime
->xfer_align
)
1892 size
-= size
% runtime
->xfer_align
;
1894 snd_pcm_stream_lock_irq(substream
);
1895 switch (runtime
->status
->state
) {
1896 case SNDRV_PCM_STATE_PREPARED
:
1897 if (size
>= runtime
->start_threshold
) {
1898 err
= snd_pcm_start(substream
);
1903 case SNDRV_PCM_STATE_DRAINING
:
1904 case SNDRV_PCM_STATE_RUNNING
:
1905 case SNDRV_PCM_STATE_PAUSED
:
1907 case SNDRV_PCM_STATE_XRUN
:
1910 case SNDRV_PCM_STATE_SUSPENDED
:
1919 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1920 snd_pcm_uframes_t avail
;
1921 snd_pcm_uframes_t cont
;
1922 if (runtime
->sleep_min
== 0 && runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1923 snd_pcm_update_hw_ptr(substream
);
1925 avail
= snd_pcm_capture_avail(runtime
);
1926 if (runtime
->status
->state
== SNDRV_PCM_STATE_DRAINING
) {
1927 if (avail
< runtime
->xfer_align
) {
1931 } else if ((avail
< runtime
->control
->avail_min
&& size
> avail
) ||
1932 (size
>= runtime
->xfer_align
&& avail
< runtime
->xfer_align
)) {
1934 enum { READY
, SIGNALED
, ERROR
, SUSPENDED
, EXPIRED
, DROPPED
} state
;
1942 init_waitqueue_entry(&wait
, current
);
1943 add_wait_queue(&runtime
->sleep
, &wait
);
1945 if (signal_pending(current
)) {
1949 set_current_state(TASK_INTERRUPTIBLE
);
1950 snd_pcm_stream_unlock_irq(substream
);
1951 tout
= schedule_timeout(10 * HZ
);
1952 snd_pcm_stream_lock_irq(substream
);
1954 if (runtime
->status
->state
!= SNDRV_PCM_STATE_PREPARED
&&
1955 runtime
->status
->state
!= SNDRV_PCM_STATE_PAUSED
) {
1956 state
= runtime
->status
->state
== SNDRV_PCM_STATE_SUSPENDED
? SUSPENDED
: EXPIRED
;
1960 switch (runtime
->status
->state
) {
1961 case SNDRV_PCM_STATE_XRUN
:
1964 case SNDRV_PCM_STATE_SUSPENDED
:
1967 case SNDRV_PCM_STATE_DRAINING
:
1969 case SNDRV_PCM_STATE_SETUP
:
1975 avail
= snd_pcm_capture_avail(runtime
);
1976 if (avail
>= runtime
->control
->avail_min
) {
1982 remove_wait_queue(&runtime
->sleep
, &wait
);
1995 snd_printd("capture read error (DMA or IRQ trouble?)\n");
2005 if (avail
> runtime
->xfer_align
)
2006 avail
-= avail
% runtime
->xfer_align
;
2007 frames
= size
> avail
? avail
: size
;
2008 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
2011 snd_assert(frames
!= 0, snd_pcm_stream_unlock_irq(substream
); return -EINVAL
);
2012 appl_ptr
= runtime
->control
->appl_ptr
;
2013 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2014 snd_pcm_stream_unlock_irq(substream
);
2015 if ((err
= transfer(substream
, appl_ofs
, data
, offset
, frames
)) < 0)
2017 snd_pcm_stream_lock_irq(substream
);
2018 switch (runtime
->status
->state
) {
2019 case SNDRV_PCM_STATE_XRUN
:
2022 case SNDRV_PCM_STATE_SUSPENDED
:
2029 if (appl_ptr
>= runtime
->boundary
)
2030 appl_ptr
-= runtime
->boundary
;
2031 runtime
->control
->appl_ptr
= appl_ptr
;
2032 if (substream
->ops
->ack
)
2033 substream
->ops
->ack(substream
);
2038 if (runtime
->sleep_min
&&
2039 runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
2040 snd_pcm_tick_prepare(substream
);
2043 snd_pcm_stream_unlock_irq(substream
);
2045 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2048 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
, void __user
*buf
, snd_pcm_uframes_t size
)
2050 struct snd_pcm_runtime
*runtime
;
2053 snd_assert(substream
!= NULL
, return -ENXIO
);
2054 runtime
= substream
->runtime
;
2055 snd_assert(runtime
!= NULL
, return -ENXIO
);
2056 snd_assert(substream
->ops
->copy
!= NULL
|| runtime
->dma_area
!= NULL
, return -EINVAL
);
2057 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2060 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2061 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
2063 return snd_pcm_lib_read1(substream
, (unsigned long)buf
, size
, nonblock
, snd_pcm_lib_read_transfer
);
2066 EXPORT_SYMBOL(snd_pcm_lib_read
);
2068 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream
*substream
,
2070 unsigned long data
, unsigned int off
,
2071 snd_pcm_uframes_t frames
)
2073 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2075 void __user
**bufs
= (void __user
**)data
;
2076 int channels
= runtime
->channels
;
2078 if (substream
->ops
->copy
) {
2079 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2083 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2084 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2088 snd_pcm_uframes_t dma_csize
= runtime
->dma_bytes
/ channels
;
2089 snd_assert(runtime
->dma_area
, return -EFAULT
);
2090 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2096 hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2097 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2098 if (copy_to_user(buf
, hwbuf
, samples_to_bytes(runtime
, frames
)))
2105 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
2107 snd_pcm_uframes_t frames
)
2109 struct snd_pcm_runtime
*runtime
;
2112 snd_assert(substream
!= NULL
, return -ENXIO
);
2113 runtime
= substream
->runtime
;
2114 snd_assert(runtime
!= NULL
, return -ENXIO
);
2115 snd_assert(substream
->ops
->copy
!= NULL
|| runtime
->dma_area
!= NULL
, return -EINVAL
);
2116 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2119 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2120 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2122 return snd_pcm_lib_read1(substream
, (unsigned long)bufs
, frames
, nonblock
, snd_pcm_lib_readv_transfer
);
2125 EXPORT_SYMBOL(snd_pcm_lib_readv
);