2 * Digital Audio (PCM) abstract layer
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * Abramo Bagnara <abramo@alsa-project.org>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/slab.h>
24 #include <linux/time.h>
25 #include <linux/math64.h>
26 #include <sound/core.h>
27 #include <sound/control.h>
28 #include <sound/info.h>
29 #include <sound/pcm.h>
30 #include <sound/pcm_params.h>
31 #include <sound/timer.h>
34 * fill ring buffer with silence
35 * runtime->silence_start: starting pointer to silence area
36 * runtime->silence_filled: size filled with silence
37 * runtime->silence_threshold: threshold from application
38 * runtime->silence_size: maximal size from application
40 * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
42 void snd_pcm_playback_silence(struct snd_pcm_substream
*substream
, snd_pcm_uframes_t new_hw_ptr
)
44 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
45 snd_pcm_uframes_t frames
, ofs
, transfer
;
47 if (runtime
->silence_size
< runtime
->boundary
) {
48 snd_pcm_sframes_t noise_dist
, n
;
49 if (runtime
->silence_start
!= runtime
->control
->appl_ptr
) {
50 n
= runtime
->control
->appl_ptr
- runtime
->silence_start
;
52 n
+= runtime
->boundary
;
53 if ((snd_pcm_uframes_t
)n
< runtime
->silence_filled
)
54 runtime
->silence_filled
-= n
;
56 runtime
->silence_filled
= 0;
57 runtime
->silence_start
= runtime
->control
->appl_ptr
;
59 if (runtime
->silence_filled
>= runtime
->buffer_size
)
61 noise_dist
= snd_pcm_playback_hw_avail(runtime
) + runtime
->silence_filled
;
62 if (noise_dist
>= (snd_pcm_sframes_t
) runtime
->silence_threshold
)
64 frames
= runtime
->silence_threshold
- noise_dist
;
65 if (frames
> runtime
->silence_size
)
66 frames
= runtime
->silence_size
;
68 if (new_hw_ptr
== ULONG_MAX
) { /* initialization */
69 snd_pcm_sframes_t avail
= snd_pcm_playback_hw_avail(runtime
);
70 runtime
->silence_filled
= avail
> 0 ? avail
: 0;
71 runtime
->silence_start
= (runtime
->status
->hw_ptr
+
72 runtime
->silence_filled
) %
75 ofs
= runtime
->status
->hw_ptr
;
76 frames
= new_hw_ptr
- ofs
;
77 if ((snd_pcm_sframes_t
)frames
< 0)
78 frames
+= runtime
->boundary
;
79 runtime
->silence_filled
-= frames
;
80 if ((snd_pcm_sframes_t
)runtime
->silence_filled
< 0) {
81 runtime
->silence_filled
= 0;
82 runtime
->silence_start
= new_hw_ptr
;
84 runtime
->silence_start
= ofs
;
87 frames
= runtime
->buffer_size
- runtime
->silence_filled
;
89 if (snd_BUG_ON(frames
> runtime
->buffer_size
))
93 ofs
= runtime
->silence_start
% runtime
->buffer_size
;
95 transfer
= ofs
+ frames
> runtime
->buffer_size
? runtime
->buffer_size
- ofs
: frames
;
96 if (runtime
->access
== SNDRV_PCM_ACCESS_RW_INTERLEAVED
||
97 runtime
->access
== SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
) {
98 if (substream
->ops
->silence
) {
100 err
= substream
->ops
->silence(substream
, -1, ofs
, transfer
);
103 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, ofs
);
104 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
* runtime
->channels
);
108 unsigned int channels
= runtime
->channels
;
109 if (substream
->ops
->silence
) {
110 for (c
= 0; c
< channels
; ++c
) {
112 err
= substream
->ops
->silence(substream
, c
, ofs
, transfer
);
116 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
117 for (c
= 0; c
< channels
; ++c
) {
118 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, ofs
);
119 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, transfer
);
123 runtime
->silence_filled
+= transfer
;
129 #ifdef CONFIG_SND_PCM_XRUN_DEBUG
130 #define xrun_debug(substream, mask) ((substream)->pstr->xrun_debug & (mask))
132 #define xrun_debug(substream, mask) 0
135 #define dump_stack_on_xrun(substream) do { \
136 if (xrun_debug(substream, 2)) \
140 static void pcm_debug_name(struct snd_pcm_substream
*substream
,
141 char *name
, size_t len
)
143 snprintf(name
, len
, "pcmC%dD%d%c:%d",
144 substream
->pcm
->card
->number
,
145 substream
->pcm
->device
,
146 substream
->stream
? 'c' : 'p',
150 static void xrun(struct snd_pcm_substream
*substream
)
152 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
154 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
155 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
156 snd_pcm_stop(substream
, SNDRV_PCM_STATE_XRUN
);
157 if (xrun_debug(substream
, 1)) {
159 pcm_debug_name(substream
, name
, sizeof(name
));
160 snd_printd(KERN_DEBUG
"XRUN: %s\n", name
);
161 dump_stack_on_xrun(substream
);
165 static snd_pcm_uframes_t
166 snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream
*substream
,
167 struct snd_pcm_runtime
*runtime
)
169 snd_pcm_uframes_t pos
;
171 pos
= substream
->ops
->pointer(substream
);
172 if (pos
== SNDRV_PCM_POS_XRUN
)
173 return pos
; /* XRUN */
174 if (pos
>= runtime
->buffer_size
) {
175 if (printk_ratelimit()) {
177 pcm_debug_name(substream
, name
, sizeof(name
));
178 snd_printd(KERN_ERR
"BUG: %s, pos = 0x%lx, "
179 "buffer size = 0x%lx, period size = 0x%lx\n",
180 name
, pos
, runtime
->buffer_size
,
181 runtime
->period_size
);
185 pos
-= pos
% runtime
->min_align
;
189 static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream
*substream
,
190 struct snd_pcm_runtime
*runtime
)
192 snd_pcm_uframes_t avail
;
194 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
195 avail
= snd_pcm_playback_avail(runtime
);
197 avail
= snd_pcm_capture_avail(runtime
);
198 if (avail
> runtime
->avail_max
)
199 runtime
->avail_max
= avail
;
200 if (runtime
->status
->state
== SNDRV_PCM_STATE_DRAINING
) {
201 if (avail
>= runtime
->buffer_size
) {
202 snd_pcm_drain_done(substream
);
206 if (avail
>= runtime
->stop_threshold
) {
211 if (avail
>= runtime
->control
->avail_min
)
212 wake_up(&runtime
->sleep
);
216 #define hw_ptr_error(substream, fmt, args...) \
218 if (xrun_debug(substream, 1)) { \
219 if (printk_ratelimit()) { \
220 snd_printd("PCM: " fmt, ##args); \
222 dump_stack_on_xrun(substream); \
226 static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream
*substream
)
228 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
229 snd_pcm_uframes_t pos
;
230 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
, hw_ptr_interrupt
, hw_base
;
231 snd_pcm_sframes_t hdelta
, delta
;
232 unsigned long jdelta
;
234 old_hw_ptr
= runtime
->status
->hw_ptr
;
235 pos
= snd_pcm_update_hw_ptr_pos(substream
, runtime
);
236 if (pos
== SNDRV_PCM_POS_XRUN
) {
240 if (xrun_debug(substream
, 8)) {
242 pcm_debug_name(substream
, name
, sizeof(name
));
243 snd_printd("period_update: %s: pos=0x%x/0x%x/0x%x, "
244 "hwptr=0x%lx, hw_base=0x%lx, hw_intr=0x%lx\n",
245 name
, (unsigned int)pos
,
246 (unsigned int)runtime
->period_size
,
247 (unsigned int)runtime
->buffer_size
,
248 (unsigned long)old_hw_ptr
,
249 (unsigned long)runtime
->hw_ptr_base
,
250 (unsigned long)runtime
->hw_ptr_interrupt
);
252 hw_base
= runtime
->hw_ptr_base
;
253 new_hw_ptr
= hw_base
+ pos
;
254 hw_ptr_interrupt
= runtime
->hw_ptr_interrupt
+ runtime
->period_size
;
255 delta
= new_hw_ptr
- hw_ptr_interrupt
;
256 if (hw_ptr_interrupt
>= runtime
->boundary
) {
257 hw_ptr_interrupt
-= runtime
->boundary
;
258 if (hw_base
< runtime
->boundary
/ 2)
259 /* hw_base was already lapped; recalc delta */
260 delta
= new_hw_ptr
- hw_ptr_interrupt
;
263 if (runtime
->periods
== 1 || new_hw_ptr
< old_hw_ptr
)
264 delta
+= runtime
->buffer_size
;
266 hw_ptr_error(substream
,
267 "Unexpected hw_pointer value "
268 "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
269 substream
->stream
, (long)pos
,
270 (long)hw_ptr_interrupt
);
272 /* simply skipping the hwptr update seems more
273 * robust in some cases, e.g. on VMware with
274 * inaccurate timer source
276 return 0; /* skip this update */
278 /* rebase to interrupt position */
279 hw_base
= new_hw_ptr
= hw_ptr_interrupt
;
280 /* align hw_base to buffer_size */
281 hw_base
-= hw_base
% runtime
->buffer_size
;
285 hw_base
+= runtime
->buffer_size
;
286 if (hw_base
>= runtime
->boundary
)
288 new_hw_ptr
= hw_base
+ pos
;
292 /* Do jiffies check only in xrun_debug mode */
293 if (!xrun_debug(substream
, 4))
294 goto no_jiffies_check
;
296 /* Skip the jiffies check for hardwares with BATCH flag.
297 * Such hardware usually just increases the position at each IRQ,
298 * thus it can't give any strange position.
300 if (runtime
->hw
.info
& SNDRV_PCM_INFO_BATCH
)
301 goto no_jiffies_check
;
302 hdelta
= new_hw_ptr
- old_hw_ptr
;
303 if (hdelta
< runtime
->delay
)
304 goto no_jiffies_check
;
305 hdelta
-= runtime
->delay
;
306 jdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
307 if (((hdelta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
309 (((runtime
->period_size
* HZ
) / runtime
->rate
)
311 hw_ptr_error(substream
,
312 "hw_ptr skipping! [Q] "
313 "(pos=%ld, delta=%ld, period=%ld, "
314 "jdelta=%lu/%lu/%lu)\n",
315 (long)pos
, (long)hdelta
,
316 (long)runtime
->period_size
, jdelta
,
317 ((hdelta
* HZ
) / runtime
->rate
), delta
);
318 hw_ptr_interrupt
= runtime
->hw_ptr_interrupt
+
319 runtime
->period_size
* delta
;
320 if (hw_ptr_interrupt
>= runtime
->boundary
)
321 hw_ptr_interrupt
-= runtime
->boundary
;
322 /* rebase to interrupt position */
323 hw_base
= new_hw_ptr
= hw_ptr_interrupt
;
324 /* align hw_base to buffer_size */
325 hw_base
-= hw_base
% runtime
->buffer_size
;
329 if (delta
> runtime
->period_size
+ runtime
->period_size
/ 2) {
330 hw_ptr_error(substream
,
332 "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
333 substream
->stream
, (long)delta
,
334 (long)hw_ptr_interrupt
);
335 /* rebase hw_ptr_interrupt */
337 new_hw_ptr
- new_hw_ptr
% runtime
->period_size
;
339 runtime
->hw_ptr_interrupt
= hw_ptr_interrupt
;
341 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
342 runtime
->silence_size
> 0)
343 snd_pcm_playback_silence(substream
, new_hw_ptr
);
345 if (runtime
->status
->hw_ptr
== new_hw_ptr
)
348 runtime
->hw_ptr_base
= hw_base
;
349 runtime
->status
->hw_ptr
= new_hw_ptr
;
350 runtime
->hw_ptr_jiffies
= jiffies
;
351 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
352 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
354 return snd_pcm_update_hw_ptr_post(substream
, runtime
);
357 /* CAUTION: call it with irq disabled */
358 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
)
360 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
361 snd_pcm_uframes_t pos
;
362 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
, hw_base
;
363 snd_pcm_sframes_t delta
;
364 unsigned long jdelta
;
366 old_hw_ptr
= runtime
->status
->hw_ptr
;
367 pos
= snd_pcm_update_hw_ptr_pos(substream
, runtime
);
368 if (pos
== SNDRV_PCM_POS_XRUN
) {
372 if (xrun_debug(substream
, 16)) {
374 pcm_debug_name(substream
, name
, sizeof(name
));
375 snd_printd("hw_update: %s: pos=0x%x/0x%x/0x%x, "
376 "hwptr=0x%lx, hw_base=0x%lx, hw_intr=0x%lx\n",
377 name
, (unsigned int)pos
,
378 (unsigned int)runtime
->period_size
,
379 (unsigned int)runtime
->buffer_size
,
380 (unsigned long)old_hw_ptr
,
381 (unsigned long)runtime
->hw_ptr_base
,
382 (unsigned long)runtime
->hw_ptr_interrupt
);
385 hw_base
= runtime
->hw_ptr_base
;
386 new_hw_ptr
= hw_base
+ pos
;
388 delta
= new_hw_ptr
- old_hw_ptr
;
389 jdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
391 delta
+= runtime
->buffer_size
;
393 hw_ptr_error(substream
,
394 "Unexpected hw_pointer value [2] "
395 "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
396 substream
->stream
, (long)pos
,
397 (long)old_hw_ptr
, jdelta
);
400 hw_base
+= runtime
->buffer_size
;
401 if (hw_base
>= runtime
->boundary
)
403 new_hw_ptr
= hw_base
+ pos
;
405 /* Do jiffies check only in xrun_debug mode */
406 if (!xrun_debug(substream
, 4))
407 goto no_jiffies_check
;
408 if (delta
< runtime
->delay
)
409 goto no_jiffies_check
;
410 delta
-= runtime
->delay
;
411 if (((delta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
412 hw_ptr_error(substream
,
414 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
415 (long)pos
, (long)delta
,
416 (long)runtime
->period_size
, jdelta
,
417 ((delta
* HZ
) / runtime
->rate
));
421 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
422 runtime
->silence_size
> 0)
423 snd_pcm_playback_silence(substream
, new_hw_ptr
);
425 if (runtime
->status
->hw_ptr
== new_hw_ptr
)
428 runtime
->hw_ptr_base
= hw_base
;
429 runtime
->status
->hw_ptr
= new_hw_ptr
;
430 runtime
->hw_ptr_jiffies
= jiffies
;
431 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
432 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
434 return snd_pcm_update_hw_ptr_post(substream
, runtime
);
438 * snd_pcm_set_ops - set the PCM operators
439 * @pcm: the pcm instance
440 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
441 * @ops: the operator table
443 * Sets the given PCM operators to the pcm instance.
445 void snd_pcm_set_ops(struct snd_pcm
*pcm
, int direction
, struct snd_pcm_ops
*ops
)
447 struct snd_pcm_str
*stream
= &pcm
->streams
[direction
];
448 struct snd_pcm_substream
*substream
;
450 for (substream
= stream
->substream
; substream
!= NULL
; substream
= substream
->next
)
451 substream
->ops
= ops
;
454 EXPORT_SYMBOL(snd_pcm_set_ops
);
457 * snd_pcm_sync - set the PCM sync id
458 * @substream: the pcm substream
460 * Sets the PCM sync identifier for the card.
462 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
)
464 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
466 runtime
->sync
.id32
[0] = substream
->pcm
->card
->number
;
467 runtime
->sync
.id32
[1] = -1;
468 runtime
->sync
.id32
[2] = -1;
469 runtime
->sync
.id32
[3] = -1;
472 EXPORT_SYMBOL(snd_pcm_set_sync
);
475 * Standard ioctl routine
478 static inline unsigned int div32(unsigned int a
, unsigned int b
,
489 static inline unsigned int div_down(unsigned int a
, unsigned int b
)
496 static inline unsigned int div_up(unsigned int a
, unsigned int b
)
508 static inline unsigned int mul(unsigned int a
, unsigned int b
)
512 if (div_down(UINT_MAX
, a
) < b
)
517 static inline unsigned int muldiv32(unsigned int a
, unsigned int b
,
518 unsigned int c
, unsigned int *r
)
520 u_int64_t n
= (u_int64_t
) a
* b
;
526 n
= div_u64_rem(n
, c
, r
);
535 * snd_interval_refine - refine the interval value of configurator
536 * @i: the interval value to refine
537 * @v: the interval value to refer to
539 * Refines the interval value with the reference value.
540 * The interval is changed to the range satisfying both intervals.
541 * The interval status (min, max, integer, etc.) are evaluated.
543 * Returns non-zero if the value is changed, zero if not changed.
545 int snd_interval_refine(struct snd_interval
*i
, const struct snd_interval
*v
)
548 if (snd_BUG_ON(snd_interval_empty(i
)))
550 if (i
->min
< v
->min
) {
552 i
->openmin
= v
->openmin
;
554 } else if (i
->min
== v
->min
&& !i
->openmin
&& v
->openmin
) {
558 if (i
->max
> v
->max
) {
560 i
->openmax
= v
->openmax
;
562 } else if (i
->max
== v
->max
&& !i
->openmax
&& v
->openmax
) {
566 if (!i
->integer
&& v
->integer
) {
579 } else if (!i
->openmin
&& !i
->openmax
&& i
->min
== i
->max
)
581 if (snd_interval_checkempty(i
)) {
582 snd_interval_none(i
);
588 EXPORT_SYMBOL(snd_interval_refine
);
590 static int snd_interval_refine_first(struct snd_interval
*i
)
592 if (snd_BUG_ON(snd_interval_empty(i
)))
594 if (snd_interval_single(i
))
597 i
->openmax
= i
->openmin
;
603 static int snd_interval_refine_last(struct snd_interval
*i
)
605 if (snd_BUG_ON(snd_interval_empty(i
)))
607 if (snd_interval_single(i
))
610 i
->openmin
= i
->openmax
;
616 void snd_interval_mul(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
618 if (a
->empty
|| b
->empty
) {
619 snd_interval_none(c
);
623 c
->min
= mul(a
->min
, b
->min
);
624 c
->openmin
= (a
->openmin
|| b
->openmin
);
625 c
->max
= mul(a
->max
, b
->max
);
626 c
->openmax
= (a
->openmax
|| b
->openmax
);
627 c
->integer
= (a
->integer
&& b
->integer
);
631 * snd_interval_div - refine the interval value with division
638 * Returns non-zero if the value is changed, zero if not changed.
640 void snd_interval_div(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
643 if (a
->empty
|| b
->empty
) {
644 snd_interval_none(c
);
648 c
->min
= div32(a
->min
, b
->max
, &r
);
649 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
651 c
->max
= div32(a
->max
, b
->min
, &r
);
656 c
->openmax
= (a
->openmax
|| b
->openmin
);
665 * snd_interval_muldivk - refine the interval value
668 * @k: divisor (as integer)
673 * Returns non-zero if the value is changed, zero if not changed.
675 void snd_interval_muldivk(const struct snd_interval
*a
, const struct snd_interval
*b
,
676 unsigned int k
, struct snd_interval
*c
)
679 if (a
->empty
|| b
->empty
) {
680 snd_interval_none(c
);
684 c
->min
= muldiv32(a
->min
, b
->min
, k
, &r
);
685 c
->openmin
= (r
|| a
->openmin
|| b
->openmin
);
686 c
->max
= muldiv32(a
->max
, b
->max
, k
, &r
);
691 c
->openmax
= (a
->openmax
|| b
->openmax
);
696 * snd_interval_mulkdiv - refine the interval value
698 * @k: dividend 2 (as integer)
704 * Returns non-zero if the value is changed, zero if not changed.
706 void snd_interval_mulkdiv(const struct snd_interval
*a
, unsigned int k
,
707 const struct snd_interval
*b
, struct snd_interval
*c
)
710 if (a
->empty
|| b
->empty
) {
711 snd_interval_none(c
);
715 c
->min
= muldiv32(a
->min
, k
, b
->max
, &r
);
716 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
718 c
->max
= muldiv32(a
->max
, k
, b
->min
, &r
);
723 c
->openmax
= (a
->openmax
|| b
->openmin
);
735 * snd_interval_ratnum - refine the interval value
736 * @i: interval to refine
737 * @rats_count: number of ratnum_t
738 * @rats: ratnum_t array
739 * @nump: pointer to store the resultant numerator
740 * @denp: pointer to store the resultant denominator
742 * Returns non-zero if the value is changed, zero if not changed.
744 int snd_interval_ratnum(struct snd_interval
*i
,
745 unsigned int rats_count
, struct snd_ratnum
*rats
,
746 unsigned int *nump
, unsigned int *denp
)
748 unsigned int best_num
, best_den
;
751 struct snd_interval t
;
753 unsigned int result_num
, result_den
;
756 best_num
= best_den
= best_diff
= 0;
757 for (k
= 0; k
< rats_count
; ++k
) {
758 unsigned int num
= rats
[k
].num
;
760 unsigned int q
= i
->min
;
764 den
= div_up(num
, q
);
765 if (den
< rats
[k
].den_min
)
767 if (den
> rats
[k
].den_max
)
768 den
= rats
[k
].den_max
;
771 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
775 diff
= num
- q
* den
;
779 diff
* best_den
< best_diff
* den
) {
789 t
.min
= div_down(best_num
, best_den
);
790 t
.openmin
= !!(best_num
% best_den
);
792 result_num
= best_num
;
793 result_diff
= best_diff
;
794 result_den
= best_den
;
795 best_num
= best_den
= best_diff
= 0;
796 for (k
= 0; k
< rats_count
; ++k
) {
797 unsigned int num
= rats
[k
].num
;
799 unsigned int q
= i
->max
;
805 den
= div_down(num
, q
);
806 if (den
> rats
[k
].den_max
)
808 if (den
< rats
[k
].den_min
)
809 den
= rats
[k
].den_min
;
812 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
814 den
+= rats
[k
].den_step
- r
;
816 diff
= q
* den
- num
;
820 diff
* best_den
< best_diff
* den
) {
830 t
.max
= div_up(best_num
, best_den
);
831 t
.openmax
= !!(best_num
% best_den
);
833 err
= snd_interval_refine(i
, &t
);
837 if (snd_interval_single(i
)) {
838 if (best_diff
* result_den
< result_diff
* best_den
) {
839 result_num
= best_num
;
840 result_den
= best_den
;
850 EXPORT_SYMBOL(snd_interval_ratnum
);
853 * snd_interval_ratden - refine the interval value
854 * @i: interval to refine
855 * @rats_count: number of struct ratden
856 * @rats: struct ratden array
857 * @nump: pointer to store the resultant numerator
858 * @denp: pointer to store the resultant denominator
860 * Returns non-zero if the value is changed, zero if not changed.
862 static int snd_interval_ratden(struct snd_interval
*i
,
863 unsigned int rats_count
, struct snd_ratden
*rats
,
864 unsigned int *nump
, unsigned int *denp
)
866 unsigned int best_num
, best_diff
, best_den
;
868 struct snd_interval t
;
871 best_num
= best_den
= best_diff
= 0;
872 for (k
= 0; k
< rats_count
; ++k
) {
874 unsigned int den
= rats
[k
].den
;
875 unsigned int q
= i
->min
;
878 if (num
> rats
[k
].num_max
)
880 if (num
< rats
[k
].num_min
)
881 num
= rats
[k
].num_max
;
884 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
886 num
+= rats
[k
].num_step
- r
;
888 diff
= num
- q
* den
;
890 diff
* best_den
< best_diff
* den
) {
900 t
.min
= div_down(best_num
, best_den
);
901 t
.openmin
= !!(best_num
% best_den
);
903 best_num
= best_den
= best_diff
= 0;
904 for (k
= 0; k
< rats_count
; ++k
) {
906 unsigned int den
= rats
[k
].den
;
907 unsigned int q
= i
->max
;
910 if (num
< rats
[k
].num_min
)
912 if (num
> rats
[k
].num_max
)
913 num
= rats
[k
].num_max
;
916 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
920 diff
= q
* den
- num
;
922 diff
* best_den
< best_diff
* den
) {
932 t
.max
= div_up(best_num
, best_den
);
933 t
.openmax
= !!(best_num
% best_den
);
935 err
= snd_interval_refine(i
, &t
);
939 if (snd_interval_single(i
)) {
949 * snd_interval_list - refine the interval value from the list
950 * @i: the interval value to refine
951 * @count: the number of elements in the list
952 * @list: the value list
953 * @mask: the bit-mask to evaluate
955 * Refines the interval value from the list.
956 * When mask is non-zero, only the elements corresponding to bit 1 are
959 * Returns non-zero if the value is changed, zero if not changed.
961 int snd_interval_list(struct snd_interval
*i
, unsigned int count
, unsigned int *list
, unsigned int mask
)
964 struct snd_interval list_range
;
970 snd_interval_any(&list_range
);
971 list_range
.min
= UINT_MAX
;
973 for (k
= 0; k
< count
; k
++) {
974 if (mask
&& !(mask
& (1 << k
)))
976 if (!snd_interval_test(i
, list
[k
]))
978 list_range
.min
= min(list_range
.min
, list
[k
]);
979 list_range
.max
= max(list_range
.max
, list
[k
]);
981 return snd_interval_refine(i
, &list_range
);
984 EXPORT_SYMBOL(snd_interval_list
);
986 static int snd_interval_step(struct snd_interval
*i
, unsigned int min
, unsigned int step
)
990 n
= (i
->min
- min
) % step
;
991 if (n
!= 0 || i
->openmin
) {
995 n
= (i
->max
- min
) % step
;
996 if (n
!= 0 || i
->openmax
) {
1000 if (snd_interval_checkempty(i
)) {
1007 /* Info constraints helpers */
1010 * snd_pcm_hw_rule_add - add the hw-constraint rule
1011 * @runtime: the pcm runtime instance
1012 * @cond: condition bits
1013 * @var: the variable to evaluate
1014 * @func: the evaluation function
1015 * @private: the private data pointer passed to function
1016 * @dep: the dependent variables
1018 * Returns zero if successful, or a negative error code on failure.
1020 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
, unsigned int cond
,
1022 snd_pcm_hw_rule_func_t func
, void *private,
1025 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1026 struct snd_pcm_hw_rule
*c
;
1029 va_start(args
, dep
);
1030 if (constrs
->rules_num
>= constrs
->rules_all
) {
1031 struct snd_pcm_hw_rule
*new;
1032 unsigned int new_rules
= constrs
->rules_all
+ 16;
1033 new = kcalloc(new_rules
, sizeof(*c
), GFP_KERNEL
);
1036 if (constrs
->rules
) {
1037 memcpy(new, constrs
->rules
,
1038 constrs
->rules_num
* sizeof(*c
));
1039 kfree(constrs
->rules
);
1041 constrs
->rules
= new;
1042 constrs
->rules_all
= new_rules
;
1044 c
= &constrs
->rules
[constrs
->rules_num
];
1048 c
->private = private;
1051 if (snd_BUG_ON(k
>= ARRAY_SIZE(c
->deps
)))
1056 dep
= va_arg(args
, int);
1058 constrs
->rules_num
++;
1063 EXPORT_SYMBOL(snd_pcm_hw_rule_add
);
1066 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1067 * @runtime: PCM runtime instance
1068 * @var: hw_params variable to apply the mask
1069 * @mask: the bitmap mask
1071 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1073 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1076 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1077 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1078 *maskp
->bits
&= mask
;
1079 memset(maskp
->bits
+ 1, 0, (SNDRV_MASK_MAX
-32) / 8); /* clear rest */
1080 if (*maskp
->bits
== 0)
1086 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1087 * @runtime: PCM runtime instance
1088 * @var: hw_params variable to apply the mask
1089 * @mask: the 64bit bitmap mask
1091 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1093 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1096 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1097 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1098 maskp
->bits
[0] &= (u_int32_t
)mask
;
1099 maskp
->bits
[1] &= (u_int32_t
)(mask
>> 32);
1100 memset(maskp
->bits
+ 2, 0, (SNDRV_MASK_MAX
-64) / 8); /* clear rest */
1101 if (! maskp
->bits
[0] && ! maskp
->bits
[1])
1107 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1108 * @runtime: PCM runtime instance
1109 * @var: hw_params variable to apply the integer constraint
1111 * Apply the constraint of integer to an interval parameter.
1113 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
)
1115 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1116 return snd_interval_setinteger(constrs_interval(constrs
, var
));
1119 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer
);
1122 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1123 * @runtime: PCM runtime instance
1124 * @var: hw_params variable to apply the range
1125 * @min: the minimal value
1126 * @max: the maximal value
1128 * Apply the min/max range constraint to an interval parameter.
1130 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1131 unsigned int min
, unsigned int max
)
1133 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1134 struct snd_interval t
;
1137 t
.openmin
= t
.openmax
= 0;
1139 return snd_interval_refine(constrs_interval(constrs
, var
), &t
);
1142 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax
);
1144 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params
*params
,
1145 struct snd_pcm_hw_rule
*rule
)
1147 struct snd_pcm_hw_constraint_list
*list
= rule
->private;
1148 return snd_interval_list(hw_param_interval(params
, rule
->var
), list
->count
, list
->list
, list
->mask
);
1153 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1154 * @runtime: PCM runtime instance
1155 * @cond: condition bits
1156 * @var: hw_params variable to apply the list constraint
1159 * Apply the list of constraints to an interval parameter.
1161 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
1163 snd_pcm_hw_param_t var
,
1164 struct snd_pcm_hw_constraint_list
*l
)
1166 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1167 snd_pcm_hw_rule_list
, l
,
1171 EXPORT_SYMBOL(snd_pcm_hw_constraint_list
);
1173 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params
*params
,
1174 struct snd_pcm_hw_rule
*rule
)
1176 struct snd_pcm_hw_constraint_ratnums
*r
= rule
->private;
1177 unsigned int num
= 0, den
= 0;
1179 err
= snd_interval_ratnum(hw_param_interval(params
, rule
->var
),
1180 r
->nrats
, r
->rats
, &num
, &den
);
1181 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1182 params
->rate_num
= num
;
1183 params
->rate_den
= den
;
1189 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1190 * @runtime: PCM runtime instance
1191 * @cond: condition bits
1192 * @var: hw_params variable to apply the ratnums constraint
1193 * @r: struct snd_ratnums constriants
1195 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
1197 snd_pcm_hw_param_t var
,
1198 struct snd_pcm_hw_constraint_ratnums
*r
)
1200 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1201 snd_pcm_hw_rule_ratnums
, r
,
1205 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums
);
1207 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params
*params
,
1208 struct snd_pcm_hw_rule
*rule
)
1210 struct snd_pcm_hw_constraint_ratdens
*r
= rule
->private;
1211 unsigned int num
= 0, den
= 0;
1212 int err
= snd_interval_ratden(hw_param_interval(params
, rule
->var
),
1213 r
->nrats
, r
->rats
, &num
, &den
);
1214 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1215 params
->rate_num
= num
;
1216 params
->rate_den
= den
;
1222 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1223 * @runtime: PCM runtime instance
1224 * @cond: condition bits
1225 * @var: hw_params variable to apply the ratdens constraint
1226 * @r: struct snd_ratdens constriants
1228 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
1230 snd_pcm_hw_param_t var
,
1231 struct snd_pcm_hw_constraint_ratdens
*r
)
1233 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1234 snd_pcm_hw_rule_ratdens
, r
,
1238 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens
);
1240 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params
*params
,
1241 struct snd_pcm_hw_rule
*rule
)
1243 unsigned int l
= (unsigned long) rule
->private;
1244 int width
= l
& 0xffff;
1245 unsigned int msbits
= l
>> 16;
1246 struct snd_interval
*i
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_SAMPLE_BITS
);
1247 if (snd_interval_single(i
) && snd_interval_value(i
) == width
)
1248 params
->msbits
= msbits
;
1253 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1254 * @runtime: PCM runtime instance
1255 * @cond: condition bits
1256 * @width: sample bits width
1257 * @msbits: msbits width
1259 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
1262 unsigned int msbits
)
1264 unsigned long l
= (msbits
<< 16) | width
;
1265 return snd_pcm_hw_rule_add(runtime
, cond
, -1,
1266 snd_pcm_hw_rule_msbits
,
1268 SNDRV_PCM_HW_PARAM_SAMPLE_BITS
, -1);
1271 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits
);
1273 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params
*params
,
1274 struct snd_pcm_hw_rule
*rule
)
1276 unsigned long step
= (unsigned long) rule
->private;
1277 return snd_interval_step(hw_param_interval(params
, rule
->var
), 0, step
);
1281 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1282 * @runtime: PCM runtime instance
1283 * @cond: condition bits
1284 * @var: hw_params variable to apply the step constraint
1287 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
1289 snd_pcm_hw_param_t var
,
1292 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1293 snd_pcm_hw_rule_step
, (void *) step
,
1297 EXPORT_SYMBOL(snd_pcm_hw_constraint_step
);
1299 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params
*params
, struct snd_pcm_hw_rule
*rule
)
1301 static unsigned int pow2_sizes
[] = {
1302 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1303 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1304 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1305 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1307 return snd_interval_list(hw_param_interval(params
, rule
->var
),
1308 ARRAY_SIZE(pow2_sizes
), pow2_sizes
, 0);
1312 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1313 * @runtime: PCM runtime instance
1314 * @cond: condition bits
1315 * @var: hw_params variable to apply the power-of-2 constraint
1317 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
1319 snd_pcm_hw_param_t var
)
1321 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1322 snd_pcm_hw_rule_pow2
, NULL
,
1326 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2
);
1328 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params
*params
,
1329 snd_pcm_hw_param_t var
)
1331 if (hw_is_mask(var
)) {
1332 snd_mask_any(hw_param_mask(params
, var
));
1333 params
->cmask
|= 1 << var
;
1334 params
->rmask
|= 1 << var
;
1337 if (hw_is_interval(var
)) {
1338 snd_interval_any(hw_param_interval(params
, var
));
1339 params
->cmask
|= 1 << var
;
1340 params
->rmask
|= 1 << var
;
1346 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
)
1349 memset(params
, 0, sizeof(*params
));
1350 for (k
= SNDRV_PCM_HW_PARAM_FIRST_MASK
; k
<= SNDRV_PCM_HW_PARAM_LAST_MASK
; k
++)
1351 _snd_pcm_hw_param_any(params
, k
);
1352 for (k
= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
; k
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
; k
++)
1353 _snd_pcm_hw_param_any(params
, k
);
1357 EXPORT_SYMBOL(_snd_pcm_hw_params_any
);
1360 * snd_pcm_hw_param_value - return @params field @var value
1361 * @params: the hw_params instance
1362 * @var: parameter to retrieve
1363 * @dir: pointer to the direction (-1,0,1) or %NULL
1365 * Return the value for field @var if it's fixed in configuration space
1366 * defined by @params. Return -%EINVAL otherwise.
1368 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
1369 snd_pcm_hw_param_t var
, int *dir
)
1371 if (hw_is_mask(var
)) {
1372 const struct snd_mask
*mask
= hw_param_mask_c(params
, var
);
1373 if (!snd_mask_single(mask
))
1377 return snd_mask_value(mask
);
1379 if (hw_is_interval(var
)) {
1380 const struct snd_interval
*i
= hw_param_interval_c(params
, var
);
1381 if (!snd_interval_single(i
))
1385 return snd_interval_value(i
);
1390 EXPORT_SYMBOL(snd_pcm_hw_param_value
);
1392 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
,
1393 snd_pcm_hw_param_t var
)
1395 if (hw_is_mask(var
)) {
1396 snd_mask_none(hw_param_mask(params
, var
));
1397 params
->cmask
|= 1 << var
;
1398 params
->rmask
|= 1 << var
;
1399 } else if (hw_is_interval(var
)) {
1400 snd_interval_none(hw_param_interval(params
, var
));
1401 params
->cmask
|= 1 << var
;
1402 params
->rmask
|= 1 << var
;
1408 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty
);
1410 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params
*params
,
1411 snd_pcm_hw_param_t var
)
1414 if (hw_is_mask(var
))
1415 changed
= snd_mask_refine_first(hw_param_mask(params
, var
));
1416 else if (hw_is_interval(var
))
1417 changed
= snd_interval_refine_first(hw_param_interval(params
, var
));
1421 params
->cmask
|= 1 << var
;
1422 params
->rmask
|= 1 << var
;
1429 * snd_pcm_hw_param_first - refine config space and return minimum value
1430 * @pcm: PCM instance
1431 * @params: the hw_params instance
1432 * @var: parameter to retrieve
1433 * @dir: pointer to the direction (-1,0,1) or %NULL
1435 * Inside configuration space defined by @params remove from @var all
1436 * values > minimum. Reduce configuration space accordingly.
1437 * Return the minimum.
1439 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
1440 struct snd_pcm_hw_params
*params
,
1441 snd_pcm_hw_param_t var
, int *dir
)
1443 int changed
= _snd_pcm_hw_param_first(params
, var
);
1446 if (params
->rmask
) {
1447 int err
= snd_pcm_hw_refine(pcm
, params
);
1448 if (snd_BUG_ON(err
< 0))
1451 return snd_pcm_hw_param_value(params
, var
, dir
);
1454 EXPORT_SYMBOL(snd_pcm_hw_param_first
);
1456 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params
*params
,
1457 snd_pcm_hw_param_t var
)
1460 if (hw_is_mask(var
))
1461 changed
= snd_mask_refine_last(hw_param_mask(params
, var
));
1462 else if (hw_is_interval(var
))
1463 changed
= snd_interval_refine_last(hw_param_interval(params
, var
));
1467 params
->cmask
|= 1 << var
;
1468 params
->rmask
|= 1 << var
;
1475 * snd_pcm_hw_param_last - refine config space and return maximum value
1476 * @pcm: PCM instance
1477 * @params: the hw_params instance
1478 * @var: parameter to retrieve
1479 * @dir: pointer to the direction (-1,0,1) or %NULL
1481 * Inside configuration space defined by @params remove from @var all
1482 * values < maximum. Reduce configuration space accordingly.
1483 * Return the maximum.
1485 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
1486 struct snd_pcm_hw_params
*params
,
1487 snd_pcm_hw_param_t var
, int *dir
)
1489 int changed
= _snd_pcm_hw_param_last(params
, var
);
1492 if (params
->rmask
) {
1493 int err
= snd_pcm_hw_refine(pcm
, params
);
1494 if (snd_BUG_ON(err
< 0))
1497 return snd_pcm_hw_param_value(params
, var
, dir
);
1500 EXPORT_SYMBOL(snd_pcm_hw_param_last
);
1503 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1504 * @pcm: PCM instance
1505 * @params: the hw_params instance
1507 * Choose one configuration from configuration space defined by @params.
1508 * The configuration chosen is that obtained fixing in this order:
1509 * first access, first format, first subformat, min channels,
1510 * min rate, min period time, max buffer size, min tick time
1512 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*pcm
,
1513 struct snd_pcm_hw_params
*params
)
1515 static int vars
[] = {
1516 SNDRV_PCM_HW_PARAM_ACCESS
,
1517 SNDRV_PCM_HW_PARAM_FORMAT
,
1518 SNDRV_PCM_HW_PARAM_SUBFORMAT
,
1519 SNDRV_PCM_HW_PARAM_CHANNELS
,
1520 SNDRV_PCM_HW_PARAM_RATE
,
1521 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1522 SNDRV_PCM_HW_PARAM_BUFFER_SIZE
,
1523 SNDRV_PCM_HW_PARAM_TICK_TIME
,
1528 for (v
= vars
; *v
!= -1; v
++) {
1529 if (*v
!= SNDRV_PCM_HW_PARAM_BUFFER_SIZE
)
1530 err
= snd_pcm_hw_param_first(pcm
, params
, *v
, NULL
);
1532 err
= snd_pcm_hw_param_last(pcm
, params
, *v
, NULL
);
1533 if (snd_BUG_ON(err
< 0))
1539 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream
*substream
,
1542 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1543 unsigned long flags
;
1544 snd_pcm_stream_lock_irqsave(substream
, flags
);
1545 if (snd_pcm_running(substream
) &&
1546 snd_pcm_update_hw_ptr(substream
) >= 0)
1547 runtime
->status
->hw_ptr
%= runtime
->buffer_size
;
1549 runtime
->status
->hw_ptr
= 0;
1550 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1554 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream
*substream
,
1557 struct snd_pcm_channel_info
*info
= arg
;
1558 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1560 if (!(runtime
->info
& SNDRV_PCM_INFO_MMAP
)) {
1564 width
= snd_pcm_format_physical_width(runtime
->format
);
1568 switch (runtime
->access
) {
1569 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
:
1570 case SNDRV_PCM_ACCESS_RW_INTERLEAVED
:
1571 info
->first
= info
->channel
* width
;
1572 info
->step
= runtime
->channels
* width
;
1574 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED
:
1575 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
:
1577 size_t size
= runtime
->dma_bytes
/ runtime
->channels
;
1578 info
->first
= info
->channel
* size
* 8;
1589 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream
*substream
,
1592 struct snd_pcm_hw_params
*params
= arg
;
1593 snd_pcm_format_t format
;
1594 int channels
, width
;
1596 params
->fifo_size
= substream
->runtime
->hw
.fifo_size
;
1597 if (!(substream
->runtime
->hw
.info
& SNDRV_PCM_INFO_FIFO_IN_FRAMES
)) {
1598 format
= params_format(params
);
1599 channels
= params_channels(params
);
1600 width
= snd_pcm_format_physical_width(format
);
1601 params
->fifo_size
/= width
* channels
;
1607 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1608 * @substream: the pcm substream instance
1609 * @cmd: ioctl command
1610 * @arg: ioctl argument
1612 * Processes the generic ioctl commands for PCM.
1613 * Can be passed as the ioctl callback for PCM ops.
1615 * Returns zero if successful, or a negative error code on failure.
1617 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
1618 unsigned int cmd
, void *arg
)
1621 case SNDRV_PCM_IOCTL1_INFO
:
1623 case SNDRV_PCM_IOCTL1_RESET
:
1624 return snd_pcm_lib_ioctl_reset(substream
, arg
);
1625 case SNDRV_PCM_IOCTL1_CHANNEL_INFO
:
1626 return snd_pcm_lib_ioctl_channel_info(substream
, arg
);
1627 case SNDRV_PCM_IOCTL1_FIFO_SIZE
:
1628 return snd_pcm_lib_ioctl_fifo_size(substream
, arg
);
1633 EXPORT_SYMBOL(snd_pcm_lib_ioctl
);
1636 * snd_pcm_period_elapsed - update the pcm status for the next period
1637 * @substream: the pcm substream instance
1639 * This function is called from the interrupt handler when the
1640 * PCM has processed the period size. It will update the current
1641 * pointer, wake up sleepers, etc.
1643 * Even if more than one periods have elapsed since the last call, you
1644 * have to call this only once.
1646 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
)
1648 struct snd_pcm_runtime
*runtime
;
1649 unsigned long flags
;
1651 if (PCM_RUNTIME_CHECK(substream
))
1653 runtime
= substream
->runtime
;
1655 if (runtime
->transfer_ack_begin
)
1656 runtime
->transfer_ack_begin(substream
);
1658 snd_pcm_stream_lock_irqsave(substream
, flags
);
1659 if (!snd_pcm_running(substream
) ||
1660 snd_pcm_update_hw_ptr_interrupt(substream
) < 0)
1663 if (substream
->timer_running
)
1664 snd_timer_interrupt(substream
->timer
, 1);
1666 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1667 if (runtime
->transfer_ack_end
)
1668 runtime
->transfer_ack_end(substream
);
1669 kill_fasync(&runtime
->fasync
, SIGIO
, POLL_IN
);
1672 EXPORT_SYMBOL(snd_pcm_period_elapsed
);
1675 * Wait until avail_min data becomes available
1676 * Returns a negative error code if any error occurs during operation.
1677 * The available space is stored on availp. When err = 0 and avail = 0
1678 * on the capture stream, it indicates the stream is in DRAINING state.
1680 static int wait_for_avail_min(struct snd_pcm_substream
*substream
,
1681 snd_pcm_uframes_t
*availp
)
1683 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1684 int is_playback
= substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
;
1687 snd_pcm_uframes_t avail
= 0;
1690 init_waitqueue_entry(&wait
, current
);
1691 add_wait_queue(&runtime
->sleep
, &wait
);
1693 if (signal_pending(current
)) {
1697 set_current_state(TASK_INTERRUPTIBLE
);
1698 snd_pcm_stream_unlock_irq(substream
);
1699 tout
= schedule_timeout(msecs_to_jiffies(10000));
1700 snd_pcm_stream_lock_irq(substream
);
1701 switch (runtime
->status
->state
) {
1702 case SNDRV_PCM_STATE_SUSPENDED
:
1705 case SNDRV_PCM_STATE_XRUN
:
1708 case SNDRV_PCM_STATE_DRAINING
:
1712 avail
= 0; /* indicate draining */
1714 case SNDRV_PCM_STATE_OPEN
:
1715 case SNDRV_PCM_STATE_SETUP
:
1716 case SNDRV_PCM_STATE_DISCONNECTED
:
1721 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1722 is_playback
? "playback" : "capture");
1727 avail
= snd_pcm_playback_avail(runtime
);
1729 avail
= snd_pcm_capture_avail(runtime
);
1730 if (avail
>= runtime
->control
->avail_min
)
1734 remove_wait_queue(&runtime
->sleep
, &wait
);
1739 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream
*substream
,
1741 unsigned long data
, unsigned int off
,
1742 snd_pcm_uframes_t frames
)
1744 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1746 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1747 if (substream
->ops
->copy
) {
1748 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1751 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1752 if (copy_from_user(hwbuf
, buf
, frames_to_bytes(runtime
, frames
)))
1758 typedef int (*transfer_f
)(struct snd_pcm_substream
*substream
, unsigned int hwoff
,
1759 unsigned long data
, unsigned int off
,
1760 snd_pcm_uframes_t size
);
1762 static snd_pcm_sframes_t
snd_pcm_lib_write1(struct snd_pcm_substream
*substream
,
1764 snd_pcm_uframes_t size
,
1766 transfer_f transfer
)
1768 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1769 snd_pcm_uframes_t xfer
= 0;
1770 snd_pcm_uframes_t offset
= 0;
1776 snd_pcm_stream_lock_irq(substream
);
1777 switch (runtime
->status
->state
) {
1778 case SNDRV_PCM_STATE_PREPARED
:
1779 case SNDRV_PCM_STATE_RUNNING
:
1780 case SNDRV_PCM_STATE_PAUSED
:
1782 case SNDRV_PCM_STATE_XRUN
:
1785 case SNDRV_PCM_STATE_SUSPENDED
:
1794 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1795 snd_pcm_uframes_t avail
;
1796 snd_pcm_uframes_t cont
;
1797 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1798 snd_pcm_update_hw_ptr(substream
);
1799 avail
= snd_pcm_playback_avail(runtime
);
1805 err
= wait_for_avail_min(substream
, &avail
);
1809 frames
= size
> avail
? avail
: size
;
1810 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
1813 if (snd_BUG_ON(!frames
)) {
1814 snd_pcm_stream_unlock_irq(substream
);
1817 appl_ptr
= runtime
->control
->appl_ptr
;
1818 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
1819 snd_pcm_stream_unlock_irq(substream
);
1820 if ((err
= transfer(substream
, appl_ofs
, data
, offset
, frames
)) < 0)
1822 snd_pcm_stream_lock_irq(substream
);
1823 switch (runtime
->status
->state
) {
1824 case SNDRV_PCM_STATE_XRUN
:
1827 case SNDRV_PCM_STATE_SUSPENDED
:
1834 if (appl_ptr
>= runtime
->boundary
)
1835 appl_ptr
-= runtime
->boundary
;
1836 runtime
->control
->appl_ptr
= appl_ptr
;
1837 if (substream
->ops
->ack
)
1838 substream
->ops
->ack(substream
);
1843 if (runtime
->status
->state
== SNDRV_PCM_STATE_PREPARED
&&
1844 snd_pcm_playback_hw_avail(runtime
) >= (snd_pcm_sframes_t
)runtime
->start_threshold
) {
1845 err
= snd_pcm_start(substream
);
1851 snd_pcm_stream_unlock_irq(substream
);
1853 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
1856 /* sanity-check for read/write methods */
1857 static int pcm_sanity_check(struct snd_pcm_substream
*substream
)
1859 struct snd_pcm_runtime
*runtime
;
1860 if (PCM_RUNTIME_CHECK(substream
))
1862 runtime
= substream
->runtime
;
1863 if (snd_BUG_ON(!substream
->ops
->copy
&& !runtime
->dma_area
))
1865 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
1870 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
, const void __user
*buf
, snd_pcm_uframes_t size
)
1872 struct snd_pcm_runtime
*runtime
;
1876 err
= pcm_sanity_check(substream
);
1879 runtime
= substream
->runtime
;
1880 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1882 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
&&
1883 runtime
->channels
> 1)
1885 return snd_pcm_lib_write1(substream
, (unsigned long)buf
, size
, nonblock
,
1886 snd_pcm_lib_write_transfer
);
1889 EXPORT_SYMBOL(snd_pcm_lib_write
);
1891 static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream
*substream
,
1893 unsigned long data
, unsigned int off
,
1894 snd_pcm_uframes_t frames
)
1896 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1898 void __user
**bufs
= (void __user
**)data
;
1899 int channels
= runtime
->channels
;
1901 if (substream
->ops
->copy
) {
1902 if (snd_BUG_ON(!substream
->ops
->silence
))
1904 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1905 if (*bufs
== NULL
) {
1906 if ((err
= substream
->ops
->silence(substream
, c
, hwoff
, frames
)) < 0)
1909 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1910 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
1915 /* default transfer behaviour */
1916 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
1917 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1918 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
1919 if (*bufs
== NULL
) {
1920 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, frames
);
1922 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1923 if (copy_from_user(hwbuf
, buf
, samples_to_bytes(runtime
, frames
)))
1931 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
1933 snd_pcm_uframes_t frames
)
1935 struct snd_pcm_runtime
*runtime
;
1939 err
= pcm_sanity_check(substream
);
1942 runtime
= substream
->runtime
;
1943 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1945 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
1947 return snd_pcm_lib_write1(substream
, (unsigned long)bufs
, frames
,
1948 nonblock
, snd_pcm_lib_writev_transfer
);
1951 EXPORT_SYMBOL(snd_pcm_lib_writev
);
1953 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream
*substream
,
1955 unsigned long data
, unsigned int off
,
1956 snd_pcm_uframes_t frames
)
1958 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1960 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1961 if (substream
->ops
->copy
) {
1962 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1965 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1966 if (copy_to_user(buf
, hwbuf
, frames_to_bytes(runtime
, frames
)))
1972 static snd_pcm_sframes_t
snd_pcm_lib_read1(struct snd_pcm_substream
*substream
,
1974 snd_pcm_uframes_t size
,
1976 transfer_f transfer
)
1978 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1979 snd_pcm_uframes_t xfer
= 0;
1980 snd_pcm_uframes_t offset
= 0;
1986 snd_pcm_stream_lock_irq(substream
);
1987 switch (runtime
->status
->state
) {
1988 case SNDRV_PCM_STATE_PREPARED
:
1989 if (size
>= runtime
->start_threshold
) {
1990 err
= snd_pcm_start(substream
);
1995 case SNDRV_PCM_STATE_DRAINING
:
1996 case SNDRV_PCM_STATE_RUNNING
:
1997 case SNDRV_PCM_STATE_PAUSED
:
1999 case SNDRV_PCM_STATE_XRUN
:
2002 case SNDRV_PCM_STATE_SUSPENDED
:
2011 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
2012 snd_pcm_uframes_t avail
;
2013 snd_pcm_uframes_t cont
;
2014 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
2015 snd_pcm_update_hw_ptr(substream
);
2016 avail
= snd_pcm_capture_avail(runtime
);
2018 if (runtime
->status
->state
==
2019 SNDRV_PCM_STATE_DRAINING
) {
2020 snd_pcm_stop(substream
, SNDRV_PCM_STATE_SETUP
);
2027 err
= wait_for_avail_min(substream
, &avail
);
2031 continue; /* draining */
2033 frames
= size
> avail
? avail
: size
;
2034 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
2037 if (snd_BUG_ON(!frames
)) {
2038 snd_pcm_stream_unlock_irq(substream
);
2041 appl_ptr
= runtime
->control
->appl_ptr
;
2042 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2043 snd_pcm_stream_unlock_irq(substream
);
2044 if ((err
= transfer(substream
, appl_ofs
, data
, offset
, frames
)) < 0)
2046 snd_pcm_stream_lock_irq(substream
);
2047 switch (runtime
->status
->state
) {
2048 case SNDRV_PCM_STATE_XRUN
:
2051 case SNDRV_PCM_STATE_SUSPENDED
:
2058 if (appl_ptr
>= runtime
->boundary
)
2059 appl_ptr
-= runtime
->boundary
;
2060 runtime
->control
->appl_ptr
= appl_ptr
;
2061 if (substream
->ops
->ack
)
2062 substream
->ops
->ack(substream
);
2069 snd_pcm_stream_unlock_irq(substream
);
2071 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2074 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
, void __user
*buf
, snd_pcm_uframes_t size
)
2076 struct snd_pcm_runtime
*runtime
;
2080 err
= pcm_sanity_check(substream
);
2083 runtime
= substream
->runtime
;
2084 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2085 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
2087 return snd_pcm_lib_read1(substream
, (unsigned long)buf
, size
, nonblock
, snd_pcm_lib_read_transfer
);
2090 EXPORT_SYMBOL(snd_pcm_lib_read
);
2092 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream
*substream
,
2094 unsigned long data
, unsigned int off
,
2095 snd_pcm_uframes_t frames
)
2097 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2099 void __user
**bufs
= (void __user
**)data
;
2100 int channels
= runtime
->channels
;
2102 if (substream
->ops
->copy
) {
2103 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2107 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2108 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2112 snd_pcm_uframes_t dma_csize
= runtime
->dma_bytes
/ channels
;
2113 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2119 hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2120 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2121 if (copy_to_user(buf
, hwbuf
, samples_to_bytes(runtime
, frames
)))
2128 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
2130 snd_pcm_uframes_t frames
)
2132 struct snd_pcm_runtime
*runtime
;
2136 err
= pcm_sanity_check(substream
);
2139 runtime
= substream
->runtime
;
2140 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2143 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2144 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2146 return snd_pcm_lib_read1(substream
, (unsigned long)bufs
, frames
, nonblock
, snd_pcm_lib_readv_transfer
);
2149 EXPORT_SYMBOL(snd_pcm_lib_readv
);