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 <sound/core.h>
26 #include <sound/control.h>
27 #include <sound/info.h>
28 #include <sound/pcm.h>
29 #include <sound/pcm_params.h>
30 #include <sound/timer.h>
33 * fill ring buffer with silence
34 * runtime->silence_start: starting pointer to silence area
35 * runtime->silence_filled: size filled with silence
36 * runtime->silence_threshold: threshold from application
37 * runtime->silence_size: maximal size from application
39 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
41 void snd_pcm_playback_silence(struct snd_pcm_substream
*substream
, snd_pcm_uframes_t new_hw_ptr
)
43 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
44 snd_pcm_uframes_t frames
, ofs
, transfer
;
46 if (runtime
->silence_size
< runtime
->boundary
) {
47 snd_pcm_sframes_t noise_dist
, n
;
48 if (runtime
->silence_start
!= runtime
->control
->appl_ptr
) {
49 n
= runtime
->control
->appl_ptr
- runtime
->silence_start
;
51 n
+= runtime
->boundary
;
52 if ((snd_pcm_uframes_t
)n
< runtime
->silence_filled
)
53 runtime
->silence_filled
-= n
;
55 runtime
->silence_filled
= 0;
56 runtime
->silence_start
= runtime
->control
->appl_ptr
;
58 if (runtime
->silence_filled
>= runtime
->buffer_size
)
60 noise_dist
= snd_pcm_playback_hw_avail(runtime
) + runtime
->silence_filled
;
61 if (noise_dist
>= (snd_pcm_sframes_t
) runtime
->silence_threshold
)
63 frames
= runtime
->silence_threshold
- noise_dist
;
64 if (frames
> runtime
->silence_size
)
65 frames
= runtime
->silence_size
;
67 if (new_hw_ptr
== ULONG_MAX
) { /* initialization */
68 snd_pcm_sframes_t avail
= snd_pcm_playback_hw_avail(runtime
);
69 runtime
->silence_filled
= avail
> 0 ? avail
: 0;
70 runtime
->silence_start
= (runtime
->status
->hw_ptr
+
71 runtime
->silence_filled
) %
74 ofs
= runtime
->status
->hw_ptr
;
75 frames
= new_hw_ptr
- ofs
;
76 if ((snd_pcm_sframes_t
)frames
< 0)
77 frames
+= runtime
->boundary
;
78 runtime
->silence_filled
-= frames
;
79 if ((snd_pcm_sframes_t
)runtime
->silence_filled
< 0) {
80 runtime
->silence_filled
= 0;
81 runtime
->silence_start
= new_hw_ptr
;
83 runtime
->silence_start
= ofs
;
86 frames
= runtime
->buffer_size
- runtime
->silence_filled
;
88 if (snd_BUG_ON(frames
> runtime
->buffer_size
))
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
);
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
);
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 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
129 #define xrun_debug(substream) ((substream)->pstr->xrun_debug)
131 #define xrun_debug(substream) 0
134 #define dump_stack_on_xrun(substream) do { \
135 if (xrun_debug(substream) > 1) \
139 static void xrun(struct snd_pcm_substream
*substream
)
141 snd_pcm_stop(substream
, SNDRV_PCM_STATE_XRUN
);
142 if (xrun_debug(substream
)) {
143 snd_printd(KERN_DEBUG
"XRUN: pcmC%dD%d%c\n",
144 substream
->pcm
->card
->number
,
145 substream
->pcm
->device
,
146 substream
->stream
? 'c' : 'p');
147 dump_stack_on_xrun(substream
);
151 static snd_pcm_uframes_t
152 snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream
*substream
,
153 struct snd_pcm_runtime
*runtime
)
155 snd_pcm_uframes_t pos
;
157 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
158 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
159 pos
= substream
->ops
->pointer(substream
);
160 if (pos
== SNDRV_PCM_POS_XRUN
)
161 return pos
; /* XRUN */
162 if (pos
>= runtime
->buffer_size
) {
163 if (printk_ratelimit()) {
164 snd_printd(KERN_ERR
"BUG: stream = %i, pos = 0x%lx, "
165 "buffer size = 0x%lx, period size = 0x%lx\n",
166 substream
->stream
, pos
, runtime
->buffer_size
,
167 runtime
->period_size
);
171 pos
-= pos
% runtime
->min_align
;
175 static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream
*substream
,
176 struct snd_pcm_runtime
*runtime
)
178 snd_pcm_uframes_t avail
;
180 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
181 avail
= snd_pcm_playback_avail(runtime
);
183 avail
= snd_pcm_capture_avail(runtime
);
184 if (avail
> runtime
->avail_max
)
185 runtime
->avail_max
= avail
;
186 if (avail
>= runtime
->stop_threshold
) {
187 if (substream
->runtime
->status
->state
== SNDRV_PCM_STATE_DRAINING
)
188 snd_pcm_drain_done(substream
);
193 if (avail
>= runtime
->control
->avail_min
)
194 wake_up(&runtime
->sleep
);
198 #define hw_ptr_error(substream, fmt, args...) \
200 if (xrun_debug(substream)) { \
201 if (printk_ratelimit()) { \
202 snd_printd("PCM: " fmt, ##args); \
204 dump_stack_on_xrun(substream); \
208 static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream
*substream
)
210 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
211 snd_pcm_uframes_t pos
;
212 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
, hw_ptr_interrupt
, hw_base
;
213 snd_pcm_sframes_t hdelta
, delta
;
214 unsigned long jdelta
;
216 old_hw_ptr
= runtime
->status
->hw_ptr
;
217 pos
= snd_pcm_update_hw_ptr_pos(substream
, runtime
);
218 if (pos
== SNDRV_PCM_POS_XRUN
) {
222 hw_base
= runtime
->hw_ptr_base
;
223 new_hw_ptr
= hw_base
+ pos
;
224 hw_ptr_interrupt
= runtime
->hw_ptr_interrupt
+ runtime
->period_size
;
225 delta
= new_hw_ptr
- hw_ptr_interrupt
;
226 if (hw_ptr_interrupt
>= runtime
->boundary
) {
227 hw_ptr_interrupt
-= runtime
->boundary
;
228 if (hw_base
< runtime
->boundary
/ 2)
229 /* hw_base was already lapped; recalc delta */
230 delta
= new_hw_ptr
- hw_ptr_interrupt
;
233 delta
+= runtime
->buffer_size
;
235 hw_ptr_error(substream
,
236 "Unexpected hw_pointer value "
237 "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
238 substream
->stream
, (long)pos
,
239 (long)hw_ptr_interrupt
);
240 /* rebase to interrupt position */
241 hw_base
= new_hw_ptr
= hw_ptr_interrupt
;
242 /* align hw_base to buffer_size */
243 hw_base
-= hw_base
% runtime
->buffer_size
;
246 hw_base
+= runtime
->buffer_size
;
247 if (hw_base
>= runtime
->boundary
)
249 new_hw_ptr
= hw_base
+ pos
;
253 /* Do jiffies check only in xrun_debug mode */
254 if (!xrun_debug(substream
))
255 goto no_jiffies_check
;
257 /* Skip the jiffies check for hardwares with BATCH flag.
258 * Such hardware usually just increases the position at each IRQ,
259 * thus it can't give any strange position.
261 if (runtime
->hw
.info
& SNDRV_PCM_INFO_BATCH
)
262 goto no_jiffies_check
;
263 hdelta
= new_hw_ptr
- old_hw_ptr
;
264 jdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
265 if (((hdelta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
267 (((runtime
->period_size
* HZ
) / runtime
->rate
)
269 hw_ptr_error(substream
,
270 "hw_ptr skipping! [Q] "
271 "(pos=%ld, delta=%ld, period=%ld, "
272 "jdelta=%lu/%lu/%lu)\n",
273 (long)pos
, (long)hdelta
,
274 (long)runtime
->period_size
, jdelta
,
275 ((hdelta
* HZ
) / runtime
->rate
), delta
);
276 hw_ptr_interrupt
= runtime
->hw_ptr_interrupt
+
277 runtime
->period_size
* delta
;
278 if (hw_ptr_interrupt
>= runtime
->boundary
)
279 hw_ptr_interrupt
-= runtime
->boundary
;
280 /* rebase to interrupt position */
281 hw_base
= new_hw_ptr
= hw_ptr_interrupt
;
282 /* align hw_base to buffer_size */
283 hw_base
-= hw_base
% runtime
->buffer_size
;
287 if (delta
> runtime
->period_size
+ runtime
->period_size
/ 2) {
288 hw_ptr_error(substream
,
290 "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
291 substream
->stream
, (long)delta
,
292 (long)hw_ptr_interrupt
);
293 /* rebase hw_ptr_interrupt */
295 new_hw_ptr
- new_hw_ptr
% runtime
->period_size
;
297 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
298 runtime
->silence_size
> 0)
299 snd_pcm_playback_silence(substream
, new_hw_ptr
);
301 runtime
->hw_ptr_base
= hw_base
;
302 runtime
->status
->hw_ptr
= new_hw_ptr
;
303 runtime
->hw_ptr_jiffies
= jiffies
;
304 runtime
->hw_ptr_interrupt
= hw_ptr_interrupt
;
306 return snd_pcm_update_hw_ptr_post(substream
, runtime
);
309 /* CAUTION: call it with irq disabled */
310 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
)
312 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
313 snd_pcm_uframes_t pos
;
314 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
, hw_base
;
315 snd_pcm_sframes_t delta
;
316 unsigned long jdelta
;
318 old_hw_ptr
= runtime
->status
->hw_ptr
;
319 pos
= snd_pcm_update_hw_ptr_pos(substream
, runtime
);
320 if (pos
== SNDRV_PCM_POS_XRUN
) {
324 hw_base
= runtime
->hw_ptr_base
;
325 new_hw_ptr
= hw_base
+ pos
;
327 delta
= new_hw_ptr
- old_hw_ptr
;
328 jdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
330 delta
+= runtime
->buffer_size
;
332 hw_ptr_error(substream
,
333 "Unexpected hw_pointer value [2] "
334 "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
335 substream
->stream
, (long)pos
,
336 (long)old_hw_ptr
, jdelta
);
339 hw_base
+= runtime
->buffer_size
;
340 if (hw_base
>= runtime
->boundary
)
342 new_hw_ptr
= hw_base
+ pos
;
344 /* Do jiffies check only in xrun_debug mode */
345 if (xrun_debug(substream
) &&
346 ((delta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
347 hw_ptr_error(substream
,
349 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
350 (long)pos
, (long)delta
,
351 (long)runtime
->period_size
, jdelta
,
352 ((delta
* HZ
) / runtime
->rate
));
355 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
356 runtime
->silence_size
> 0)
357 snd_pcm_playback_silence(substream
, new_hw_ptr
);
359 runtime
->hw_ptr_base
= hw_base
;
360 runtime
->status
->hw_ptr
= new_hw_ptr
;
361 runtime
->hw_ptr_jiffies
= jiffies
;
363 return snd_pcm_update_hw_ptr_post(substream
, runtime
);
367 * snd_pcm_set_ops - set the PCM operators
368 * @pcm: the pcm instance
369 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
370 * @ops: the operator table
372 * Sets the given PCM operators to the pcm instance.
374 void snd_pcm_set_ops(struct snd_pcm
*pcm
, int direction
, struct snd_pcm_ops
*ops
)
376 struct snd_pcm_str
*stream
= &pcm
->streams
[direction
];
377 struct snd_pcm_substream
*substream
;
379 for (substream
= stream
->substream
; substream
!= NULL
; substream
= substream
->next
)
380 substream
->ops
= ops
;
383 EXPORT_SYMBOL(snd_pcm_set_ops
);
386 * snd_pcm_sync - set the PCM sync id
387 * @substream: the pcm substream
389 * Sets the PCM sync identifier for the card.
391 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
)
393 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
395 runtime
->sync
.id32
[0] = substream
->pcm
->card
->number
;
396 runtime
->sync
.id32
[1] = -1;
397 runtime
->sync
.id32
[2] = -1;
398 runtime
->sync
.id32
[3] = -1;
401 EXPORT_SYMBOL(snd_pcm_set_sync
);
404 * Standard ioctl routine
407 static inline unsigned int div32(unsigned int a
, unsigned int b
,
418 static inline unsigned int div_down(unsigned int a
, unsigned int b
)
425 static inline unsigned int div_up(unsigned int a
, unsigned int b
)
437 static inline unsigned int mul(unsigned int a
, unsigned int b
)
441 if (div_down(UINT_MAX
, a
) < b
)
446 static inline unsigned int muldiv32(unsigned int a
, unsigned int b
,
447 unsigned int c
, unsigned int *r
)
449 u_int64_t n
= (u_int64_t
) a
* b
;
464 * snd_interval_refine - refine the interval value of configurator
465 * @i: the interval value to refine
466 * @v: the interval value to refer to
468 * Refines the interval value with the reference value.
469 * The interval is changed to the range satisfying both intervals.
470 * The interval status (min, max, integer, etc.) are evaluated.
472 * Returns non-zero if the value is changed, zero if not changed.
474 int snd_interval_refine(struct snd_interval
*i
, const struct snd_interval
*v
)
477 if (snd_BUG_ON(snd_interval_empty(i
)))
479 if (i
->min
< v
->min
) {
481 i
->openmin
= v
->openmin
;
483 } else if (i
->min
== v
->min
&& !i
->openmin
&& v
->openmin
) {
487 if (i
->max
> v
->max
) {
489 i
->openmax
= v
->openmax
;
491 } else if (i
->max
== v
->max
&& !i
->openmax
&& v
->openmax
) {
495 if (!i
->integer
&& v
->integer
) {
508 } else if (!i
->openmin
&& !i
->openmax
&& i
->min
== i
->max
)
510 if (snd_interval_checkempty(i
)) {
511 snd_interval_none(i
);
517 EXPORT_SYMBOL(snd_interval_refine
);
519 static int snd_interval_refine_first(struct snd_interval
*i
)
521 if (snd_BUG_ON(snd_interval_empty(i
)))
523 if (snd_interval_single(i
))
526 i
->openmax
= i
->openmin
;
532 static int snd_interval_refine_last(struct snd_interval
*i
)
534 if (snd_BUG_ON(snd_interval_empty(i
)))
536 if (snd_interval_single(i
))
539 i
->openmin
= i
->openmax
;
545 void snd_interval_mul(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
547 if (a
->empty
|| b
->empty
) {
548 snd_interval_none(c
);
552 c
->min
= mul(a
->min
, b
->min
);
553 c
->openmin
= (a
->openmin
|| b
->openmin
);
554 c
->max
= mul(a
->max
, b
->max
);
555 c
->openmax
= (a
->openmax
|| b
->openmax
);
556 c
->integer
= (a
->integer
&& b
->integer
);
560 * snd_interval_div - refine the interval value with division
567 * Returns non-zero if the value is changed, zero if not changed.
569 void snd_interval_div(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
572 if (a
->empty
|| b
->empty
) {
573 snd_interval_none(c
);
577 c
->min
= div32(a
->min
, b
->max
, &r
);
578 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
580 c
->max
= div32(a
->max
, b
->min
, &r
);
585 c
->openmax
= (a
->openmax
|| b
->openmin
);
594 * snd_interval_muldivk - refine the interval value
597 * @k: divisor (as integer)
602 * Returns non-zero if the value is changed, zero if not changed.
604 void snd_interval_muldivk(const struct snd_interval
*a
, const struct snd_interval
*b
,
605 unsigned int k
, struct snd_interval
*c
)
608 if (a
->empty
|| b
->empty
) {
609 snd_interval_none(c
);
613 c
->min
= muldiv32(a
->min
, b
->min
, k
, &r
);
614 c
->openmin
= (r
|| a
->openmin
|| b
->openmin
);
615 c
->max
= muldiv32(a
->max
, b
->max
, k
, &r
);
620 c
->openmax
= (a
->openmax
|| b
->openmax
);
625 * snd_interval_mulkdiv - refine the interval value
627 * @k: dividend 2 (as integer)
633 * Returns non-zero if the value is changed, zero if not changed.
635 void snd_interval_mulkdiv(const struct snd_interval
*a
, unsigned int k
,
636 const struct snd_interval
*b
, struct snd_interval
*c
)
639 if (a
->empty
|| b
->empty
) {
640 snd_interval_none(c
);
644 c
->min
= muldiv32(a
->min
, k
, b
->max
, &r
);
645 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
647 c
->max
= muldiv32(a
->max
, k
, b
->min
, &r
);
652 c
->openmax
= (a
->openmax
|| b
->openmin
);
664 * snd_interval_ratnum - refine the interval value
665 * @i: interval to refine
666 * @rats_count: number of ratnum_t
667 * @rats: ratnum_t array
668 * @nump: pointer to store the resultant numerator
669 * @denp: pointer to store the resultant denominator
671 * Returns non-zero if the value is changed, zero if not changed.
673 int snd_interval_ratnum(struct snd_interval
*i
,
674 unsigned int rats_count
, struct snd_ratnum
*rats
,
675 unsigned int *nump
, unsigned int *denp
)
677 unsigned int best_num
, best_diff
, best_den
;
679 struct snd_interval t
;
682 best_num
= best_den
= best_diff
= 0;
683 for (k
= 0; k
< rats_count
; ++k
) {
684 unsigned int num
= rats
[k
].num
;
686 unsigned int q
= i
->min
;
690 den
= div_down(num
, q
);
691 if (den
< rats
[k
].den_min
)
693 if (den
> rats
[k
].den_max
)
694 den
= rats
[k
].den_max
;
697 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
701 diff
= num
- q
* den
;
703 diff
* best_den
< best_diff
* den
) {
713 t
.min
= div_down(best_num
, best_den
);
714 t
.openmin
= !!(best_num
% best_den
);
716 best_num
= best_den
= best_diff
= 0;
717 for (k
= 0; k
< rats_count
; ++k
) {
718 unsigned int num
= rats
[k
].num
;
720 unsigned int q
= i
->max
;
726 den
= div_up(num
, q
);
727 if (den
> rats
[k
].den_max
)
729 if (den
< rats
[k
].den_min
)
730 den
= rats
[k
].den_min
;
733 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
735 den
+= rats
[k
].den_step
- r
;
737 diff
= q
* den
- num
;
739 diff
* best_den
< best_diff
* den
) {
749 t
.max
= div_up(best_num
, best_den
);
750 t
.openmax
= !!(best_num
% best_den
);
752 err
= snd_interval_refine(i
, &t
);
756 if (snd_interval_single(i
)) {
765 EXPORT_SYMBOL(snd_interval_ratnum
);
768 * snd_interval_ratden - refine the interval value
769 * @i: interval to refine
770 * @rats_count: number of struct ratden
771 * @rats: struct ratden array
772 * @nump: pointer to store the resultant numerator
773 * @denp: pointer to store the resultant denominator
775 * Returns non-zero if the value is changed, zero if not changed.
777 static int snd_interval_ratden(struct snd_interval
*i
,
778 unsigned int rats_count
, struct snd_ratden
*rats
,
779 unsigned int *nump
, unsigned int *denp
)
781 unsigned int best_num
, best_diff
, best_den
;
783 struct snd_interval t
;
786 best_num
= best_den
= best_diff
= 0;
787 for (k
= 0; k
< rats_count
; ++k
) {
789 unsigned int den
= rats
[k
].den
;
790 unsigned int q
= i
->min
;
793 if (num
> rats
[k
].num_max
)
795 if (num
< rats
[k
].num_min
)
796 num
= rats
[k
].num_max
;
799 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
801 num
+= rats
[k
].num_step
- r
;
803 diff
= num
- q
* den
;
805 diff
* best_den
< best_diff
* den
) {
815 t
.min
= div_down(best_num
, best_den
);
816 t
.openmin
= !!(best_num
% best_den
);
818 best_num
= best_den
= best_diff
= 0;
819 for (k
= 0; k
< rats_count
; ++k
) {
821 unsigned int den
= rats
[k
].den
;
822 unsigned int q
= i
->max
;
825 if (num
< rats
[k
].num_min
)
827 if (num
> rats
[k
].num_max
)
828 num
= rats
[k
].num_max
;
831 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
835 diff
= q
* den
- num
;
837 diff
* best_den
< best_diff
* den
) {
847 t
.max
= div_up(best_num
, best_den
);
848 t
.openmax
= !!(best_num
% best_den
);
850 err
= snd_interval_refine(i
, &t
);
854 if (snd_interval_single(i
)) {
864 * snd_interval_list - refine the interval value from the list
865 * @i: the interval value to refine
866 * @count: the number of elements in the list
867 * @list: the value list
868 * @mask: the bit-mask to evaluate
870 * Refines the interval value from the list.
871 * When mask is non-zero, only the elements corresponding to bit 1 are
874 * Returns non-zero if the value is changed, zero if not changed.
876 int snd_interval_list(struct snd_interval
*i
, unsigned int count
, unsigned int *list
, unsigned int mask
)
879 struct snd_interval list_range
;
885 snd_interval_any(&list_range
);
886 list_range
.min
= UINT_MAX
;
888 for (k
= 0; k
< count
; k
++) {
889 if (mask
&& !(mask
& (1 << k
)))
891 if (!snd_interval_test(i
, list
[k
]))
893 list_range
.min
= min(list_range
.min
, list
[k
]);
894 list_range
.max
= max(list_range
.max
, list
[k
]);
896 return snd_interval_refine(i
, &list_range
);
899 EXPORT_SYMBOL(snd_interval_list
);
901 static int snd_interval_step(struct snd_interval
*i
, unsigned int min
, unsigned int step
)
905 n
= (i
->min
- min
) % step
;
906 if (n
!= 0 || i
->openmin
) {
910 n
= (i
->max
- min
) % step
;
911 if (n
!= 0 || i
->openmax
) {
915 if (snd_interval_checkempty(i
)) {
922 /* Info constraints helpers */
925 * snd_pcm_hw_rule_add - add the hw-constraint rule
926 * @runtime: the pcm runtime instance
927 * @cond: condition bits
928 * @var: the variable to evaluate
929 * @func: the evaluation function
930 * @private: the private data pointer passed to function
931 * @dep: the dependent variables
933 * Returns zero if successful, or a negative error code on failure.
935 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
, unsigned int cond
,
937 snd_pcm_hw_rule_func_t func
, void *private,
940 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
941 struct snd_pcm_hw_rule
*c
;
945 if (constrs
->rules_num
>= constrs
->rules_all
) {
946 struct snd_pcm_hw_rule
*new;
947 unsigned int new_rules
= constrs
->rules_all
+ 16;
948 new = kcalloc(new_rules
, sizeof(*c
), GFP_KERNEL
);
951 if (constrs
->rules
) {
952 memcpy(new, constrs
->rules
,
953 constrs
->rules_num
* sizeof(*c
));
954 kfree(constrs
->rules
);
956 constrs
->rules
= new;
957 constrs
->rules_all
= new_rules
;
959 c
= &constrs
->rules
[constrs
->rules_num
];
963 c
->private = private;
966 if (snd_BUG_ON(k
>= ARRAY_SIZE(c
->deps
)))
971 dep
= va_arg(args
, int);
973 constrs
->rules_num
++;
978 EXPORT_SYMBOL(snd_pcm_hw_rule_add
);
981 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
982 * @runtime: PCM runtime instance
983 * @var: hw_params variable to apply the mask
984 * @mask: the bitmap mask
986 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
988 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
991 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
992 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
993 *maskp
->bits
&= mask
;
994 memset(maskp
->bits
+ 1, 0, (SNDRV_MASK_MAX
-32) / 8); /* clear rest */
995 if (*maskp
->bits
== 0)
1001 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1002 * @runtime: PCM runtime instance
1003 * @var: hw_params variable to apply the mask
1004 * @mask: the 64bit bitmap mask
1006 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1008 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1011 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1012 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1013 maskp
->bits
[0] &= (u_int32_t
)mask
;
1014 maskp
->bits
[1] &= (u_int32_t
)(mask
>> 32);
1015 memset(maskp
->bits
+ 2, 0, (SNDRV_MASK_MAX
-64) / 8); /* clear rest */
1016 if (! maskp
->bits
[0] && ! maskp
->bits
[1])
1022 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1023 * @runtime: PCM runtime instance
1024 * @var: hw_params variable to apply the integer constraint
1026 * Apply the constraint of integer to an interval parameter.
1028 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
)
1030 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1031 return snd_interval_setinteger(constrs_interval(constrs
, var
));
1034 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer
);
1037 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1038 * @runtime: PCM runtime instance
1039 * @var: hw_params variable to apply the range
1040 * @min: the minimal value
1041 * @max: the maximal value
1043 * Apply the min/max range constraint to an interval parameter.
1045 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1046 unsigned int min
, unsigned int max
)
1048 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1049 struct snd_interval t
;
1052 t
.openmin
= t
.openmax
= 0;
1054 return snd_interval_refine(constrs_interval(constrs
, var
), &t
);
1057 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax
);
1059 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params
*params
,
1060 struct snd_pcm_hw_rule
*rule
)
1062 struct snd_pcm_hw_constraint_list
*list
= rule
->private;
1063 return snd_interval_list(hw_param_interval(params
, rule
->var
), list
->count
, list
->list
, list
->mask
);
1068 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1069 * @runtime: PCM runtime instance
1070 * @cond: condition bits
1071 * @var: hw_params variable to apply the list constraint
1074 * Apply the list of constraints to an interval parameter.
1076 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
1078 snd_pcm_hw_param_t var
,
1079 struct snd_pcm_hw_constraint_list
*l
)
1081 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1082 snd_pcm_hw_rule_list
, l
,
1086 EXPORT_SYMBOL(snd_pcm_hw_constraint_list
);
1088 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params
*params
,
1089 struct snd_pcm_hw_rule
*rule
)
1091 struct snd_pcm_hw_constraint_ratnums
*r
= rule
->private;
1092 unsigned int num
= 0, den
= 0;
1094 err
= snd_interval_ratnum(hw_param_interval(params
, rule
->var
),
1095 r
->nrats
, r
->rats
, &num
, &den
);
1096 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1097 params
->rate_num
= num
;
1098 params
->rate_den
= den
;
1104 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1105 * @runtime: PCM runtime instance
1106 * @cond: condition bits
1107 * @var: hw_params variable to apply the ratnums constraint
1108 * @r: struct snd_ratnums constriants
1110 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
1112 snd_pcm_hw_param_t var
,
1113 struct snd_pcm_hw_constraint_ratnums
*r
)
1115 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1116 snd_pcm_hw_rule_ratnums
, r
,
1120 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums
);
1122 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params
*params
,
1123 struct snd_pcm_hw_rule
*rule
)
1125 struct snd_pcm_hw_constraint_ratdens
*r
= rule
->private;
1126 unsigned int num
= 0, den
= 0;
1127 int err
= snd_interval_ratden(hw_param_interval(params
, rule
->var
),
1128 r
->nrats
, r
->rats
, &num
, &den
);
1129 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1130 params
->rate_num
= num
;
1131 params
->rate_den
= den
;
1137 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1138 * @runtime: PCM runtime instance
1139 * @cond: condition bits
1140 * @var: hw_params variable to apply the ratdens constraint
1141 * @r: struct snd_ratdens constriants
1143 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
1145 snd_pcm_hw_param_t var
,
1146 struct snd_pcm_hw_constraint_ratdens
*r
)
1148 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1149 snd_pcm_hw_rule_ratdens
, r
,
1153 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens
);
1155 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params
*params
,
1156 struct snd_pcm_hw_rule
*rule
)
1158 unsigned int l
= (unsigned long) rule
->private;
1159 int width
= l
& 0xffff;
1160 unsigned int msbits
= l
>> 16;
1161 struct snd_interval
*i
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_SAMPLE_BITS
);
1162 if (snd_interval_single(i
) && snd_interval_value(i
) == width
)
1163 params
->msbits
= msbits
;
1168 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1169 * @runtime: PCM runtime instance
1170 * @cond: condition bits
1171 * @width: sample bits width
1172 * @msbits: msbits width
1174 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
1177 unsigned int msbits
)
1179 unsigned long l
= (msbits
<< 16) | width
;
1180 return snd_pcm_hw_rule_add(runtime
, cond
, -1,
1181 snd_pcm_hw_rule_msbits
,
1183 SNDRV_PCM_HW_PARAM_SAMPLE_BITS
, -1);
1186 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits
);
1188 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params
*params
,
1189 struct snd_pcm_hw_rule
*rule
)
1191 unsigned long step
= (unsigned long) rule
->private;
1192 return snd_interval_step(hw_param_interval(params
, rule
->var
), 0, step
);
1196 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1197 * @runtime: PCM runtime instance
1198 * @cond: condition bits
1199 * @var: hw_params variable to apply the step constraint
1202 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
1204 snd_pcm_hw_param_t var
,
1207 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1208 snd_pcm_hw_rule_step
, (void *) step
,
1212 EXPORT_SYMBOL(snd_pcm_hw_constraint_step
);
1214 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params
*params
, struct snd_pcm_hw_rule
*rule
)
1216 static unsigned int pow2_sizes
[] = {
1217 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1218 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1219 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1220 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1222 return snd_interval_list(hw_param_interval(params
, rule
->var
),
1223 ARRAY_SIZE(pow2_sizes
), pow2_sizes
, 0);
1227 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1228 * @runtime: PCM runtime instance
1229 * @cond: condition bits
1230 * @var: hw_params variable to apply the power-of-2 constraint
1232 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
1234 snd_pcm_hw_param_t var
)
1236 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1237 snd_pcm_hw_rule_pow2
, NULL
,
1241 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2
);
1243 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params
*params
,
1244 snd_pcm_hw_param_t var
)
1246 if (hw_is_mask(var
)) {
1247 snd_mask_any(hw_param_mask(params
, var
));
1248 params
->cmask
|= 1 << var
;
1249 params
->rmask
|= 1 << var
;
1252 if (hw_is_interval(var
)) {
1253 snd_interval_any(hw_param_interval(params
, var
));
1254 params
->cmask
|= 1 << var
;
1255 params
->rmask
|= 1 << var
;
1261 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
)
1264 memset(params
, 0, sizeof(*params
));
1265 for (k
= SNDRV_PCM_HW_PARAM_FIRST_MASK
; k
<= SNDRV_PCM_HW_PARAM_LAST_MASK
; k
++)
1266 _snd_pcm_hw_param_any(params
, k
);
1267 for (k
= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
; k
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
; k
++)
1268 _snd_pcm_hw_param_any(params
, k
);
1272 EXPORT_SYMBOL(_snd_pcm_hw_params_any
);
1275 * snd_pcm_hw_param_value - return @params field @var value
1276 * @params: the hw_params instance
1277 * @var: parameter to retrieve
1278 * @dir: pointer to the direction (-1,0,1) or %NULL
1280 * Return the value for field @var if it's fixed in configuration space
1281 * defined by @params. Return -%EINVAL otherwise.
1283 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
1284 snd_pcm_hw_param_t var
, int *dir
)
1286 if (hw_is_mask(var
)) {
1287 const struct snd_mask
*mask
= hw_param_mask_c(params
, var
);
1288 if (!snd_mask_single(mask
))
1292 return snd_mask_value(mask
);
1294 if (hw_is_interval(var
)) {
1295 const struct snd_interval
*i
= hw_param_interval_c(params
, var
);
1296 if (!snd_interval_single(i
))
1300 return snd_interval_value(i
);
1305 EXPORT_SYMBOL(snd_pcm_hw_param_value
);
1307 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
,
1308 snd_pcm_hw_param_t var
)
1310 if (hw_is_mask(var
)) {
1311 snd_mask_none(hw_param_mask(params
, var
));
1312 params
->cmask
|= 1 << var
;
1313 params
->rmask
|= 1 << var
;
1314 } else if (hw_is_interval(var
)) {
1315 snd_interval_none(hw_param_interval(params
, var
));
1316 params
->cmask
|= 1 << var
;
1317 params
->rmask
|= 1 << var
;
1323 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty
);
1325 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params
*params
,
1326 snd_pcm_hw_param_t var
)
1329 if (hw_is_mask(var
))
1330 changed
= snd_mask_refine_first(hw_param_mask(params
, var
));
1331 else if (hw_is_interval(var
))
1332 changed
= snd_interval_refine_first(hw_param_interval(params
, var
));
1336 params
->cmask
|= 1 << var
;
1337 params
->rmask
|= 1 << var
;
1344 * snd_pcm_hw_param_first - refine config space and return minimum value
1345 * @pcm: PCM instance
1346 * @params: the hw_params instance
1347 * @var: parameter to retrieve
1348 * @dir: pointer to the direction (-1,0,1) or %NULL
1350 * Inside configuration space defined by @params remove from @var all
1351 * values > minimum. Reduce configuration space accordingly.
1352 * Return the minimum.
1354 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
1355 struct snd_pcm_hw_params
*params
,
1356 snd_pcm_hw_param_t var
, int *dir
)
1358 int changed
= _snd_pcm_hw_param_first(params
, var
);
1361 if (params
->rmask
) {
1362 int err
= snd_pcm_hw_refine(pcm
, params
);
1363 if (snd_BUG_ON(err
< 0))
1366 return snd_pcm_hw_param_value(params
, var
, dir
);
1369 EXPORT_SYMBOL(snd_pcm_hw_param_first
);
1371 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params
*params
,
1372 snd_pcm_hw_param_t var
)
1375 if (hw_is_mask(var
))
1376 changed
= snd_mask_refine_last(hw_param_mask(params
, var
));
1377 else if (hw_is_interval(var
))
1378 changed
= snd_interval_refine_last(hw_param_interval(params
, var
));
1382 params
->cmask
|= 1 << var
;
1383 params
->rmask
|= 1 << var
;
1390 * snd_pcm_hw_param_last - refine config space and return maximum value
1391 * @pcm: PCM instance
1392 * @params: the hw_params instance
1393 * @var: parameter to retrieve
1394 * @dir: pointer to the direction (-1,0,1) or %NULL
1396 * Inside configuration space defined by @params remove from @var all
1397 * values < maximum. Reduce configuration space accordingly.
1398 * Return the maximum.
1400 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
1401 struct snd_pcm_hw_params
*params
,
1402 snd_pcm_hw_param_t var
, int *dir
)
1404 int changed
= _snd_pcm_hw_param_last(params
, var
);
1407 if (params
->rmask
) {
1408 int err
= snd_pcm_hw_refine(pcm
, params
);
1409 if (snd_BUG_ON(err
< 0))
1412 return snd_pcm_hw_param_value(params
, var
, dir
);
1415 EXPORT_SYMBOL(snd_pcm_hw_param_last
);
1418 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1419 * @pcm: PCM instance
1420 * @params: the hw_params instance
1422 * Choose one configuration from configuration space defined by @params.
1423 * The configuration chosen is that obtained fixing in this order:
1424 * first access, first format, first subformat, min channels,
1425 * min rate, min period time, max buffer size, min tick time
1427 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*pcm
,
1428 struct snd_pcm_hw_params
*params
)
1430 static int vars
[] = {
1431 SNDRV_PCM_HW_PARAM_ACCESS
,
1432 SNDRV_PCM_HW_PARAM_FORMAT
,
1433 SNDRV_PCM_HW_PARAM_SUBFORMAT
,
1434 SNDRV_PCM_HW_PARAM_CHANNELS
,
1435 SNDRV_PCM_HW_PARAM_RATE
,
1436 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1437 SNDRV_PCM_HW_PARAM_BUFFER_SIZE
,
1438 SNDRV_PCM_HW_PARAM_TICK_TIME
,
1443 for (v
= vars
; *v
!= -1; v
++) {
1444 if (*v
!= SNDRV_PCM_HW_PARAM_BUFFER_SIZE
)
1445 err
= snd_pcm_hw_param_first(pcm
, params
, *v
, NULL
);
1447 err
= snd_pcm_hw_param_last(pcm
, params
, *v
, NULL
);
1448 if (snd_BUG_ON(err
< 0))
1454 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream
*substream
,
1457 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1458 unsigned long flags
;
1459 snd_pcm_stream_lock_irqsave(substream
, flags
);
1460 if (snd_pcm_running(substream
) &&
1461 snd_pcm_update_hw_ptr(substream
) >= 0)
1462 runtime
->status
->hw_ptr
%= runtime
->buffer_size
;
1464 runtime
->status
->hw_ptr
= 0;
1465 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1469 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream
*substream
,
1472 struct snd_pcm_channel_info
*info
= arg
;
1473 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1475 if (!(runtime
->info
& SNDRV_PCM_INFO_MMAP
)) {
1479 width
= snd_pcm_format_physical_width(runtime
->format
);
1483 switch (runtime
->access
) {
1484 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
:
1485 case SNDRV_PCM_ACCESS_RW_INTERLEAVED
:
1486 info
->first
= info
->channel
* width
;
1487 info
->step
= runtime
->channels
* width
;
1489 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED
:
1490 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
:
1492 size_t size
= runtime
->dma_bytes
/ runtime
->channels
;
1493 info
->first
= info
->channel
* size
* 8;
1505 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1506 * @substream: the pcm substream instance
1507 * @cmd: ioctl command
1508 * @arg: ioctl argument
1510 * Processes the generic ioctl commands for PCM.
1511 * Can be passed as the ioctl callback for PCM ops.
1513 * Returns zero if successful, or a negative error code on failure.
1515 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
1516 unsigned int cmd
, void *arg
)
1519 case SNDRV_PCM_IOCTL1_INFO
:
1521 case SNDRV_PCM_IOCTL1_RESET
:
1522 return snd_pcm_lib_ioctl_reset(substream
, arg
);
1523 case SNDRV_PCM_IOCTL1_CHANNEL_INFO
:
1524 return snd_pcm_lib_ioctl_channel_info(substream
, arg
);
1529 EXPORT_SYMBOL(snd_pcm_lib_ioctl
);
1532 * snd_pcm_period_elapsed - update the pcm status for the next period
1533 * @substream: the pcm substream instance
1535 * This function is called from the interrupt handler when the
1536 * PCM has processed the period size. It will update the current
1537 * pointer, wake up sleepers, etc.
1539 * Even if more than one periods have elapsed since the last call, you
1540 * have to call this only once.
1542 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
)
1544 struct snd_pcm_runtime
*runtime
;
1545 unsigned long flags
;
1547 if (PCM_RUNTIME_CHECK(substream
))
1549 runtime
= substream
->runtime
;
1551 if (runtime
->transfer_ack_begin
)
1552 runtime
->transfer_ack_begin(substream
);
1554 snd_pcm_stream_lock_irqsave(substream
, flags
);
1555 if (!snd_pcm_running(substream
) ||
1556 snd_pcm_update_hw_ptr_interrupt(substream
) < 0)
1559 if (substream
->timer_running
)
1560 snd_timer_interrupt(substream
->timer
, 1);
1562 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1563 if (runtime
->transfer_ack_end
)
1564 runtime
->transfer_ack_end(substream
);
1565 kill_fasync(&runtime
->fasync
, SIGIO
, POLL_IN
);
1568 EXPORT_SYMBOL(snd_pcm_period_elapsed
);
1571 * Wait until avail_min data becomes available
1572 * Returns a negative error code if any error occurs during operation.
1573 * The available space is stored on availp. When err = 0 and avail = 0
1574 * on the capture stream, it indicates the stream is in DRAINING state.
1576 static int wait_for_avail_min(struct snd_pcm_substream
*substream
,
1577 snd_pcm_uframes_t
*availp
)
1579 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1580 int is_playback
= substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
;
1583 snd_pcm_uframes_t avail
= 0;
1586 init_waitqueue_entry(&wait
, current
);
1587 add_wait_queue(&runtime
->sleep
, &wait
);
1589 if (signal_pending(current
)) {
1593 set_current_state(TASK_INTERRUPTIBLE
);
1594 snd_pcm_stream_unlock_irq(substream
);
1595 tout
= schedule_timeout(msecs_to_jiffies(10000));
1596 snd_pcm_stream_lock_irq(substream
);
1597 switch (runtime
->status
->state
) {
1598 case SNDRV_PCM_STATE_SUSPENDED
:
1601 case SNDRV_PCM_STATE_XRUN
:
1604 case SNDRV_PCM_STATE_DRAINING
:
1608 avail
= 0; /* indicate draining */
1610 case SNDRV_PCM_STATE_OPEN
:
1611 case SNDRV_PCM_STATE_SETUP
:
1612 case SNDRV_PCM_STATE_DISCONNECTED
:
1617 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1618 is_playback
? "playback" : "capture");
1623 avail
= snd_pcm_playback_avail(runtime
);
1625 avail
= snd_pcm_capture_avail(runtime
);
1626 if (avail
>= runtime
->control
->avail_min
)
1630 remove_wait_queue(&runtime
->sleep
, &wait
);
1635 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream
*substream
,
1637 unsigned long data
, unsigned int off
,
1638 snd_pcm_uframes_t frames
)
1640 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1642 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1643 if (substream
->ops
->copy
) {
1644 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1647 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1648 if (copy_from_user(hwbuf
, buf
, frames_to_bytes(runtime
, frames
)))
1654 typedef int (*transfer_f
)(struct snd_pcm_substream
*substream
, unsigned int hwoff
,
1655 unsigned long data
, unsigned int off
,
1656 snd_pcm_uframes_t size
);
1658 static snd_pcm_sframes_t
snd_pcm_lib_write1(struct snd_pcm_substream
*substream
,
1660 snd_pcm_uframes_t size
,
1662 transfer_f transfer
)
1664 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1665 snd_pcm_uframes_t xfer
= 0;
1666 snd_pcm_uframes_t offset
= 0;
1672 snd_pcm_stream_lock_irq(substream
);
1673 switch (runtime
->status
->state
) {
1674 case SNDRV_PCM_STATE_PREPARED
:
1675 case SNDRV_PCM_STATE_RUNNING
:
1676 case SNDRV_PCM_STATE_PAUSED
:
1678 case SNDRV_PCM_STATE_XRUN
:
1681 case SNDRV_PCM_STATE_SUSPENDED
:
1690 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1691 snd_pcm_uframes_t avail
;
1692 snd_pcm_uframes_t cont
;
1693 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1694 snd_pcm_update_hw_ptr(substream
);
1695 avail
= snd_pcm_playback_avail(runtime
);
1701 err
= wait_for_avail_min(substream
, &avail
);
1705 frames
= size
> avail
? avail
: size
;
1706 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
1709 if (snd_BUG_ON(!frames
)) {
1710 snd_pcm_stream_unlock_irq(substream
);
1713 appl_ptr
= runtime
->control
->appl_ptr
;
1714 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
1715 snd_pcm_stream_unlock_irq(substream
);
1716 if ((err
= transfer(substream
, appl_ofs
, data
, offset
, frames
)) < 0)
1718 snd_pcm_stream_lock_irq(substream
);
1719 switch (runtime
->status
->state
) {
1720 case SNDRV_PCM_STATE_XRUN
:
1723 case SNDRV_PCM_STATE_SUSPENDED
:
1730 if (appl_ptr
>= runtime
->boundary
)
1731 appl_ptr
-= runtime
->boundary
;
1732 runtime
->control
->appl_ptr
= appl_ptr
;
1733 if (substream
->ops
->ack
)
1734 substream
->ops
->ack(substream
);
1739 if (runtime
->status
->state
== SNDRV_PCM_STATE_PREPARED
&&
1740 snd_pcm_playback_hw_avail(runtime
) >= (snd_pcm_sframes_t
)runtime
->start_threshold
) {
1741 err
= snd_pcm_start(substream
);
1747 snd_pcm_stream_unlock_irq(substream
);
1749 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
1752 /* sanity-check for read/write methods */
1753 static int pcm_sanity_check(struct snd_pcm_substream
*substream
)
1755 struct snd_pcm_runtime
*runtime
;
1756 if (PCM_RUNTIME_CHECK(substream
))
1758 runtime
= substream
->runtime
;
1759 if (snd_BUG_ON(!substream
->ops
->copy
&& !runtime
->dma_area
))
1761 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
1766 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
, const void __user
*buf
, snd_pcm_uframes_t size
)
1768 struct snd_pcm_runtime
*runtime
;
1772 err
= pcm_sanity_check(substream
);
1775 runtime
= substream
->runtime
;
1776 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1778 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
&&
1779 runtime
->channels
> 1)
1781 return snd_pcm_lib_write1(substream
, (unsigned long)buf
, size
, nonblock
,
1782 snd_pcm_lib_write_transfer
);
1785 EXPORT_SYMBOL(snd_pcm_lib_write
);
1787 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream
*substream
,
1789 unsigned long data
, unsigned int off
,
1790 snd_pcm_uframes_t frames
)
1792 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1794 void __user
**bufs
= (void __user
**)data
;
1795 int channels
= runtime
->channels
;
1797 if (substream
->ops
->copy
) {
1798 if (snd_BUG_ON(!substream
->ops
->silence
))
1800 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1801 if (*bufs
== NULL
) {
1802 if ((err
= substream
->ops
->silence(substream
, c
, hwoff
, frames
)) < 0)
1805 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1806 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
1811 /* default transfer behaviour */
1812 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
1813 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1814 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
1815 if (*bufs
== NULL
) {
1816 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, frames
);
1818 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1819 if (copy_from_user(hwbuf
, buf
, samples_to_bytes(runtime
, frames
)))
1827 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
1829 snd_pcm_uframes_t frames
)
1831 struct snd_pcm_runtime
*runtime
;
1835 err
= pcm_sanity_check(substream
);
1838 runtime
= substream
->runtime
;
1839 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1841 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
1843 return snd_pcm_lib_write1(substream
, (unsigned long)bufs
, frames
,
1844 nonblock
, snd_pcm_lib_writev_transfer
);
1847 EXPORT_SYMBOL(snd_pcm_lib_writev
);
1849 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream
*substream
,
1851 unsigned long data
, unsigned int off
,
1852 snd_pcm_uframes_t frames
)
1854 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1856 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1857 if (substream
->ops
->copy
) {
1858 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1861 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1862 if (copy_to_user(buf
, hwbuf
, frames_to_bytes(runtime
, frames
)))
1868 static snd_pcm_sframes_t
snd_pcm_lib_read1(struct snd_pcm_substream
*substream
,
1870 snd_pcm_uframes_t size
,
1872 transfer_f transfer
)
1874 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1875 snd_pcm_uframes_t xfer
= 0;
1876 snd_pcm_uframes_t offset
= 0;
1882 snd_pcm_stream_lock_irq(substream
);
1883 switch (runtime
->status
->state
) {
1884 case SNDRV_PCM_STATE_PREPARED
:
1885 if (size
>= runtime
->start_threshold
) {
1886 err
= snd_pcm_start(substream
);
1891 case SNDRV_PCM_STATE_DRAINING
:
1892 case SNDRV_PCM_STATE_RUNNING
:
1893 case SNDRV_PCM_STATE_PAUSED
:
1895 case SNDRV_PCM_STATE_XRUN
:
1898 case SNDRV_PCM_STATE_SUSPENDED
:
1907 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1908 snd_pcm_uframes_t avail
;
1909 snd_pcm_uframes_t cont
;
1910 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1911 snd_pcm_update_hw_ptr(substream
);
1912 avail
= snd_pcm_capture_avail(runtime
);
1914 if (runtime
->status
->state
==
1915 SNDRV_PCM_STATE_DRAINING
) {
1916 snd_pcm_stop(substream
, SNDRV_PCM_STATE_SETUP
);
1923 err
= wait_for_avail_min(substream
, &avail
);
1927 continue; /* draining */
1929 frames
= size
> avail
? avail
: size
;
1930 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
1933 if (snd_BUG_ON(!frames
)) {
1934 snd_pcm_stream_unlock_irq(substream
);
1937 appl_ptr
= runtime
->control
->appl_ptr
;
1938 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
1939 snd_pcm_stream_unlock_irq(substream
);
1940 if ((err
= transfer(substream
, appl_ofs
, data
, offset
, frames
)) < 0)
1942 snd_pcm_stream_lock_irq(substream
);
1943 switch (runtime
->status
->state
) {
1944 case SNDRV_PCM_STATE_XRUN
:
1947 case SNDRV_PCM_STATE_SUSPENDED
:
1954 if (appl_ptr
>= runtime
->boundary
)
1955 appl_ptr
-= runtime
->boundary
;
1956 runtime
->control
->appl_ptr
= appl_ptr
;
1957 if (substream
->ops
->ack
)
1958 substream
->ops
->ack(substream
);
1965 snd_pcm_stream_unlock_irq(substream
);
1967 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
1970 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
, void __user
*buf
, snd_pcm_uframes_t size
)
1972 struct snd_pcm_runtime
*runtime
;
1976 err
= pcm_sanity_check(substream
);
1979 runtime
= substream
->runtime
;
1980 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1981 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
1983 return snd_pcm_lib_read1(substream
, (unsigned long)buf
, size
, nonblock
, snd_pcm_lib_read_transfer
);
1986 EXPORT_SYMBOL(snd_pcm_lib_read
);
1988 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream
*substream
,
1990 unsigned long data
, unsigned int off
,
1991 snd_pcm_uframes_t frames
)
1993 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1995 void __user
**bufs
= (void __user
**)data
;
1996 int channels
= runtime
->channels
;
1998 if (substream
->ops
->copy
) {
1999 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2003 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2004 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2008 snd_pcm_uframes_t dma_csize
= runtime
->dma_bytes
/ channels
;
2009 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2015 hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2016 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2017 if (copy_to_user(buf
, hwbuf
, samples_to_bytes(runtime
, frames
)))
2024 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
2026 snd_pcm_uframes_t frames
)
2028 struct snd_pcm_runtime
*runtime
;
2032 err
= pcm_sanity_check(substream
);
2035 runtime
= substream
->runtime
;
2036 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2039 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2040 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2042 return snd_pcm_lib_read1(substream
, (unsigned long)bufs
, frames
, nonblock
, snd_pcm_lib_readv_transfer
);
2045 EXPORT_SYMBOL(snd_pcm_lib_readv
);