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, mask) ((substream)->pstr->xrun_debug & (mask))
131 #define xrun_debug(substream, mask) 0
134 #define dump_stack_on_xrun(substream) do { \
135 if (xrun_debug(substream, 2)) \
139 static void xrun(struct snd_pcm_substream
*substream
)
141 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
143 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
144 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
145 snd_pcm_stop(substream
, SNDRV_PCM_STATE_XRUN
);
146 if (xrun_debug(substream
, 1)) {
147 snd_printd(KERN_DEBUG
"XRUN: pcmC%dD%d%c\n",
148 substream
->pcm
->card
->number
,
149 substream
->pcm
->device
,
150 substream
->stream
? 'c' : 'p');
151 dump_stack_on_xrun(substream
);
155 static snd_pcm_uframes_t
156 snd_pcm_update_hw_ptr_pos(struct snd_pcm_substream
*substream
,
157 struct snd_pcm_runtime
*runtime
)
159 snd_pcm_uframes_t pos
;
161 pos
= substream
->ops
->pointer(substream
);
162 if (pos
== SNDRV_PCM_POS_XRUN
)
163 return pos
; /* XRUN */
164 if (pos
>= runtime
->buffer_size
) {
165 if (printk_ratelimit()) {
166 snd_printd(KERN_ERR
"BUG: stream = %i, pos = 0x%lx, "
167 "buffer size = 0x%lx, period size = 0x%lx\n",
168 substream
->stream
, pos
, runtime
->buffer_size
,
169 runtime
->period_size
);
173 pos
-= pos
% runtime
->min_align
;
177 static int snd_pcm_update_hw_ptr_post(struct snd_pcm_substream
*substream
,
178 struct snd_pcm_runtime
*runtime
)
180 snd_pcm_uframes_t avail
;
182 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
)
183 avail
= snd_pcm_playback_avail(runtime
);
185 avail
= snd_pcm_capture_avail(runtime
);
186 if (avail
> runtime
->avail_max
)
187 runtime
->avail_max
= avail
;
188 if (avail
>= runtime
->stop_threshold
) {
189 if (substream
->runtime
->status
->state
== SNDRV_PCM_STATE_DRAINING
)
190 snd_pcm_drain_done(substream
);
195 if (avail
>= runtime
->control
->avail_min
)
196 wake_up(&runtime
->sleep
);
200 #define hw_ptr_error(substream, fmt, args...) \
202 if (xrun_debug(substream, 1)) { \
203 if (printk_ratelimit()) { \
204 snd_printd("PCM: " fmt, ##args); \
206 dump_stack_on_xrun(substream); \
210 static int snd_pcm_update_hw_ptr_interrupt(struct snd_pcm_substream
*substream
)
212 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
213 snd_pcm_uframes_t pos
;
214 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
, hw_ptr_interrupt
, hw_base
;
215 snd_pcm_sframes_t hdelta
, delta
;
216 unsigned long jdelta
;
218 old_hw_ptr
= runtime
->status
->hw_ptr
;
219 pos
= snd_pcm_update_hw_ptr_pos(substream
, runtime
);
220 if (pos
== SNDRV_PCM_POS_XRUN
) {
224 hw_base
= runtime
->hw_ptr_base
;
225 new_hw_ptr
= hw_base
+ pos
;
226 hw_ptr_interrupt
= runtime
->hw_ptr_interrupt
+ runtime
->period_size
;
227 delta
= new_hw_ptr
- hw_ptr_interrupt
;
228 if (hw_ptr_interrupt
>= runtime
->boundary
) {
229 hw_ptr_interrupt
-= runtime
->boundary
;
230 if (hw_base
< runtime
->boundary
/ 2)
231 /* hw_base was already lapped; recalc delta */
232 delta
= new_hw_ptr
- hw_ptr_interrupt
;
235 delta
+= runtime
->buffer_size
;
237 hw_ptr_error(substream
,
238 "Unexpected hw_pointer value "
239 "(stream=%i, pos=%ld, intr_ptr=%ld)\n",
240 substream
->stream
, (long)pos
,
241 (long)hw_ptr_interrupt
);
242 /* rebase to interrupt position */
243 hw_base
= new_hw_ptr
= hw_ptr_interrupt
;
244 /* align hw_base to buffer_size */
245 hw_base
-= hw_base
% runtime
->buffer_size
;
248 hw_base
+= runtime
->buffer_size
;
249 if (hw_base
>= runtime
->boundary
)
251 new_hw_ptr
= hw_base
+ pos
;
255 /* Do jiffies check only in xrun_debug mode */
256 if (!xrun_debug(substream
, 4))
257 goto no_jiffies_check
;
259 /* Skip the jiffies check for hardwares with BATCH flag.
260 * Such hardware usually just increases the position at each IRQ,
261 * thus it can't give any strange position.
263 if (runtime
->hw
.info
& SNDRV_PCM_INFO_BATCH
)
264 goto no_jiffies_check
;
265 hdelta
= new_hw_ptr
- old_hw_ptr
;
266 if (hdelta
< runtime
->delay
)
267 goto no_jiffies_check
;
268 hdelta
-= runtime
->delay
;
269 jdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
270 if (((hdelta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
272 (((runtime
->period_size
* HZ
) / runtime
->rate
)
274 hw_ptr_error(substream
,
275 "hw_ptr skipping! [Q] "
276 "(pos=%ld, delta=%ld, period=%ld, "
277 "jdelta=%lu/%lu/%lu)\n",
278 (long)pos
, (long)hdelta
,
279 (long)runtime
->period_size
, jdelta
,
280 ((hdelta
* HZ
) / runtime
->rate
), delta
);
281 hw_ptr_interrupt
= runtime
->hw_ptr_interrupt
+
282 runtime
->period_size
* delta
;
283 if (hw_ptr_interrupt
>= runtime
->boundary
)
284 hw_ptr_interrupt
-= runtime
->boundary
;
285 /* rebase to interrupt position */
286 hw_base
= new_hw_ptr
= hw_ptr_interrupt
;
287 /* align hw_base to buffer_size */
288 hw_base
-= hw_base
% runtime
->buffer_size
;
292 if (delta
> runtime
->period_size
+ runtime
->period_size
/ 2) {
293 hw_ptr_error(substream
,
295 "(stream=%i, delta=%ld, intr_ptr=%ld)\n",
296 substream
->stream
, (long)delta
,
297 (long)hw_ptr_interrupt
);
298 /* rebase hw_ptr_interrupt */
300 new_hw_ptr
- new_hw_ptr
% runtime
->period_size
;
302 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
303 runtime
->silence_size
> 0)
304 snd_pcm_playback_silence(substream
, new_hw_ptr
);
306 if (runtime
->status
->hw_ptr
== new_hw_ptr
)
309 runtime
->hw_ptr_base
= hw_base
;
310 runtime
->status
->hw_ptr
= new_hw_ptr
;
311 runtime
->hw_ptr_jiffies
= jiffies
;
312 runtime
->hw_ptr_interrupt
= hw_ptr_interrupt
;
313 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
314 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
316 return snd_pcm_update_hw_ptr_post(substream
, runtime
);
319 /* CAUTION: call it with irq disabled */
320 int snd_pcm_update_hw_ptr(struct snd_pcm_substream
*substream
)
322 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
323 snd_pcm_uframes_t pos
;
324 snd_pcm_uframes_t old_hw_ptr
, new_hw_ptr
, hw_base
;
325 snd_pcm_sframes_t delta
;
326 unsigned long jdelta
;
328 old_hw_ptr
= runtime
->status
->hw_ptr
;
329 pos
= snd_pcm_update_hw_ptr_pos(substream
, runtime
);
330 if (pos
== SNDRV_PCM_POS_XRUN
) {
334 hw_base
= runtime
->hw_ptr_base
;
335 new_hw_ptr
= hw_base
+ pos
;
337 delta
= new_hw_ptr
- old_hw_ptr
;
338 jdelta
= jiffies
- runtime
->hw_ptr_jiffies
;
340 delta
+= runtime
->buffer_size
;
342 hw_ptr_error(substream
,
343 "Unexpected hw_pointer value [2] "
344 "(stream=%i, pos=%ld, old_ptr=%ld, jdelta=%li)\n",
345 substream
->stream
, (long)pos
,
346 (long)old_hw_ptr
, jdelta
);
349 hw_base
+= runtime
->buffer_size
;
350 if (hw_base
>= runtime
->boundary
)
352 new_hw_ptr
= hw_base
+ pos
;
354 /* Do jiffies check only in xrun_debug mode */
355 if (!xrun_debug(substream
, 4))
356 goto no_jiffies_check
;
357 if (delta
< runtime
->delay
)
358 goto no_jiffies_check
;
359 delta
-= runtime
->delay
;
360 if (((delta
* HZ
) / runtime
->rate
) > jdelta
+ HZ
/100) {
361 hw_ptr_error(substream
,
363 "(pos=%ld, delta=%ld, period=%ld, jdelta=%lu/%lu)\n",
364 (long)pos
, (long)delta
,
365 (long)runtime
->period_size
, jdelta
,
366 ((delta
* HZ
) / runtime
->rate
));
370 if (substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
&&
371 runtime
->silence_size
> 0)
372 snd_pcm_playback_silence(substream
, new_hw_ptr
);
374 if (runtime
->status
->hw_ptr
!= new_hw_ptr
)
377 runtime
->hw_ptr_base
= hw_base
;
378 runtime
->status
->hw_ptr
= new_hw_ptr
;
379 runtime
->hw_ptr_jiffies
= jiffies
;
380 if (runtime
->tstamp_mode
== SNDRV_PCM_TSTAMP_ENABLE
)
381 snd_pcm_gettime(runtime
, (struct timespec
*)&runtime
->status
->tstamp
);
383 return snd_pcm_update_hw_ptr_post(substream
, runtime
);
387 * snd_pcm_set_ops - set the PCM operators
388 * @pcm: the pcm instance
389 * @direction: stream direction, SNDRV_PCM_STREAM_XXX
390 * @ops: the operator table
392 * Sets the given PCM operators to the pcm instance.
394 void snd_pcm_set_ops(struct snd_pcm
*pcm
, int direction
, struct snd_pcm_ops
*ops
)
396 struct snd_pcm_str
*stream
= &pcm
->streams
[direction
];
397 struct snd_pcm_substream
*substream
;
399 for (substream
= stream
->substream
; substream
!= NULL
; substream
= substream
->next
)
400 substream
->ops
= ops
;
403 EXPORT_SYMBOL(snd_pcm_set_ops
);
406 * snd_pcm_sync - set the PCM sync id
407 * @substream: the pcm substream
409 * Sets the PCM sync identifier for the card.
411 void snd_pcm_set_sync(struct snd_pcm_substream
*substream
)
413 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
415 runtime
->sync
.id32
[0] = substream
->pcm
->card
->number
;
416 runtime
->sync
.id32
[1] = -1;
417 runtime
->sync
.id32
[2] = -1;
418 runtime
->sync
.id32
[3] = -1;
421 EXPORT_SYMBOL(snd_pcm_set_sync
);
424 * Standard ioctl routine
427 static inline unsigned int div32(unsigned int a
, unsigned int b
,
438 static inline unsigned int div_down(unsigned int a
, unsigned int b
)
445 static inline unsigned int div_up(unsigned int a
, unsigned int b
)
457 static inline unsigned int mul(unsigned int a
, unsigned int b
)
461 if (div_down(UINT_MAX
, a
) < b
)
466 static inline unsigned int muldiv32(unsigned int a
, unsigned int b
,
467 unsigned int c
, unsigned int *r
)
469 u_int64_t n
= (u_int64_t
) a
* b
;
484 * snd_interval_refine - refine the interval value of configurator
485 * @i: the interval value to refine
486 * @v: the interval value to refer to
488 * Refines the interval value with the reference value.
489 * The interval is changed to the range satisfying both intervals.
490 * The interval status (min, max, integer, etc.) are evaluated.
492 * Returns non-zero if the value is changed, zero if not changed.
494 int snd_interval_refine(struct snd_interval
*i
, const struct snd_interval
*v
)
497 if (snd_BUG_ON(snd_interval_empty(i
)))
499 if (i
->min
< v
->min
) {
501 i
->openmin
= v
->openmin
;
503 } else if (i
->min
== v
->min
&& !i
->openmin
&& v
->openmin
) {
507 if (i
->max
> v
->max
) {
509 i
->openmax
= v
->openmax
;
511 } else if (i
->max
== v
->max
&& !i
->openmax
&& v
->openmax
) {
515 if (!i
->integer
&& v
->integer
) {
528 } else if (!i
->openmin
&& !i
->openmax
&& i
->min
== i
->max
)
530 if (snd_interval_checkempty(i
)) {
531 snd_interval_none(i
);
537 EXPORT_SYMBOL(snd_interval_refine
);
539 static int snd_interval_refine_first(struct snd_interval
*i
)
541 if (snd_BUG_ON(snd_interval_empty(i
)))
543 if (snd_interval_single(i
))
546 i
->openmax
= i
->openmin
;
552 static int snd_interval_refine_last(struct snd_interval
*i
)
554 if (snd_BUG_ON(snd_interval_empty(i
)))
556 if (snd_interval_single(i
))
559 i
->openmin
= i
->openmax
;
565 void snd_interval_mul(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
567 if (a
->empty
|| b
->empty
) {
568 snd_interval_none(c
);
572 c
->min
= mul(a
->min
, b
->min
);
573 c
->openmin
= (a
->openmin
|| b
->openmin
);
574 c
->max
= mul(a
->max
, b
->max
);
575 c
->openmax
= (a
->openmax
|| b
->openmax
);
576 c
->integer
= (a
->integer
&& b
->integer
);
580 * snd_interval_div - refine the interval value with division
587 * Returns non-zero if the value is changed, zero if not changed.
589 void snd_interval_div(const struct snd_interval
*a
, const struct snd_interval
*b
, struct snd_interval
*c
)
592 if (a
->empty
|| b
->empty
) {
593 snd_interval_none(c
);
597 c
->min
= div32(a
->min
, b
->max
, &r
);
598 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
600 c
->max
= div32(a
->max
, b
->min
, &r
);
605 c
->openmax
= (a
->openmax
|| b
->openmin
);
614 * snd_interval_muldivk - refine the interval value
617 * @k: divisor (as integer)
622 * Returns non-zero if the value is changed, zero if not changed.
624 void snd_interval_muldivk(const struct snd_interval
*a
, const struct snd_interval
*b
,
625 unsigned int k
, struct snd_interval
*c
)
628 if (a
->empty
|| b
->empty
) {
629 snd_interval_none(c
);
633 c
->min
= muldiv32(a
->min
, b
->min
, k
, &r
);
634 c
->openmin
= (r
|| a
->openmin
|| b
->openmin
);
635 c
->max
= muldiv32(a
->max
, b
->max
, k
, &r
);
640 c
->openmax
= (a
->openmax
|| b
->openmax
);
645 * snd_interval_mulkdiv - refine the interval value
647 * @k: dividend 2 (as integer)
653 * Returns non-zero if the value is changed, zero if not changed.
655 void snd_interval_mulkdiv(const struct snd_interval
*a
, unsigned int k
,
656 const struct snd_interval
*b
, struct snd_interval
*c
)
659 if (a
->empty
|| b
->empty
) {
660 snd_interval_none(c
);
664 c
->min
= muldiv32(a
->min
, k
, b
->max
, &r
);
665 c
->openmin
= (r
|| a
->openmin
|| b
->openmax
);
667 c
->max
= muldiv32(a
->max
, k
, b
->min
, &r
);
672 c
->openmax
= (a
->openmax
|| b
->openmin
);
684 * snd_interval_ratnum - refine the interval value
685 * @i: interval to refine
686 * @rats_count: number of ratnum_t
687 * @rats: ratnum_t array
688 * @nump: pointer to store the resultant numerator
689 * @denp: pointer to store the resultant denominator
691 * Returns non-zero if the value is changed, zero if not changed.
693 int snd_interval_ratnum(struct snd_interval
*i
,
694 unsigned int rats_count
, struct snd_ratnum
*rats
,
695 unsigned int *nump
, unsigned int *denp
)
697 unsigned int best_num
, best_diff
, best_den
;
699 struct snd_interval t
;
702 best_num
= best_den
= best_diff
= 0;
703 for (k
= 0; k
< rats_count
; ++k
) {
704 unsigned int num
= rats
[k
].num
;
706 unsigned int q
= i
->min
;
710 den
= div_down(num
, q
);
711 if (den
< rats
[k
].den_min
)
713 if (den
> rats
[k
].den_max
)
714 den
= rats
[k
].den_max
;
717 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
721 diff
= num
- q
* den
;
723 diff
* best_den
< best_diff
* den
) {
733 t
.min
= div_down(best_num
, best_den
);
734 t
.openmin
= !!(best_num
% best_den
);
736 best_num
= best_den
= best_diff
= 0;
737 for (k
= 0; k
< rats_count
; ++k
) {
738 unsigned int num
= rats
[k
].num
;
740 unsigned int q
= i
->max
;
746 den
= div_up(num
, q
);
747 if (den
> rats
[k
].den_max
)
749 if (den
< rats
[k
].den_min
)
750 den
= rats
[k
].den_min
;
753 r
= (den
- rats
[k
].den_min
) % rats
[k
].den_step
;
755 den
+= rats
[k
].den_step
- r
;
757 diff
= q
* den
- num
;
759 diff
* best_den
< best_diff
* den
) {
769 t
.max
= div_up(best_num
, best_den
);
770 t
.openmax
= !!(best_num
% best_den
);
772 err
= snd_interval_refine(i
, &t
);
776 if (snd_interval_single(i
)) {
785 EXPORT_SYMBOL(snd_interval_ratnum
);
788 * snd_interval_ratden - refine the interval value
789 * @i: interval to refine
790 * @rats_count: number of struct ratden
791 * @rats: struct ratden array
792 * @nump: pointer to store the resultant numerator
793 * @denp: pointer to store the resultant denominator
795 * Returns non-zero if the value is changed, zero if not changed.
797 static int snd_interval_ratden(struct snd_interval
*i
,
798 unsigned int rats_count
, struct snd_ratden
*rats
,
799 unsigned int *nump
, unsigned int *denp
)
801 unsigned int best_num
, best_diff
, best_den
;
803 struct snd_interval t
;
806 best_num
= best_den
= best_diff
= 0;
807 for (k
= 0; k
< rats_count
; ++k
) {
809 unsigned int den
= rats
[k
].den
;
810 unsigned int q
= i
->min
;
813 if (num
> rats
[k
].num_max
)
815 if (num
< rats
[k
].num_min
)
816 num
= rats
[k
].num_max
;
819 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
821 num
+= rats
[k
].num_step
- r
;
823 diff
= num
- q
* den
;
825 diff
* best_den
< best_diff
* den
) {
835 t
.min
= div_down(best_num
, best_den
);
836 t
.openmin
= !!(best_num
% best_den
);
838 best_num
= best_den
= best_diff
= 0;
839 for (k
= 0; k
< rats_count
; ++k
) {
841 unsigned int den
= rats
[k
].den
;
842 unsigned int q
= i
->max
;
845 if (num
< rats
[k
].num_min
)
847 if (num
> rats
[k
].num_max
)
848 num
= rats
[k
].num_max
;
851 r
= (num
- rats
[k
].num_min
) % rats
[k
].num_step
;
855 diff
= q
* den
- num
;
857 diff
* best_den
< best_diff
* den
) {
867 t
.max
= div_up(best_num
, best_den
);
868 t
.openmax
= !!(best_num
% best_den
);
870 err
= snd_interval_refine(i
, &t
);
874 if (snd_interval_single(i
)) {
884 * snd_interval_list - refine the interval value from the list
885 * @i: the interval value to refine
886 * @count: the number of elements in the list
887 * @list: the value list
888 * @mask: the bit-mask to evaluate
890 * Refines the interval value from the list.
891 * When mask is non-zero, only the elements corresponding to bit 1 are
894 * Returns non-zero if the value is changed, zero if not changed.
896 int snd_interval_list(struct snd_interval
*i
, unsigned int count
, unsigned int *list
, unsigned int mask
)
905 for (k
= 0; k
< count
; k
++) {
906 if (mask
&& !(mask
& (1 << k
)))
908 if (i
->min
== list
[k
] && !i
->openmin
)
910 if (i
->min
< list
[k
]) {
920 for (k
= count
; k
-- > 0;) {
921 if (mask
&& !(mask
& (1 << k
)))
923 if (i
->max
== list
[k
] && !i
->openmax
)
925 if (i
->max
> list
[k
]) {
935 if (snd_interval_checkempty(i
)) {
942 EXPORT_SYMBOL(snd_interval_list
);
944 static int snd_interval_step(struct snd_interval
*i
, unsigned int min
, unsigned int step
)
948 n
= (i
->min
- min
) % step
;
949 if (n
!= 0 || i
->openmin
) {
953 n
= (i
->max
- min
) % step
;
954 if (n
!= 0 || i
->openmax
) {
958 if (snd_interval_checkempty(i
)) {
965 /* Info constraints helpers */
968 * snd_pcm_hw_rule_add - add the hw-constraint rule
969 * @runtime: the pcm runtime instance
970 * @cond: condition bits
971 * @var: the variable to evaluate
972 * @func: the evaluation function
973 * @private: the private data pointer passed to function
974 * @dep: the dependent variables
976 * Returns zero if successful, or a negative error code on failure.
978 int snd_pcm_hw_rule_add(struct snd_pcm_runtime
*runtime
, unsigned int cond
,
980 snd_pcm_hw_rule_func_t func
, void *private,
983 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
984 struct snd_pcm_hw_rule
*c
;
988 if (constrs
->rules_num
>= constrs
->rules_all
) {
989 struct snd_pcm_hw_rule
*new;
990 unsigned int new_rules
= constrs
->rules_all
+ 16;
991 new = kcalloc(new_rules
, sizeof(*c
), GFP_KERNEL
);
994 if (constrs
->rules
) {
995 memcpy(new, constrs
->rules
,
996 constrs
->rules_num
* sizeof(*c
));
997 kfree(constrs
->rules
);
999 constrs
->rules
= new;
1000 constrs
->rules_all
= new_rules
;
1002 c
= &constrs
->rules
[constrs
->rules_num
];
1006 c
->private = private;
1009 if (snd_BUG_ON(k
>= ARRAY_SIZE(c
->deps
)))
1014 dep
= va_arg(args
, int);
1016 constrs
->rules_num
++;
1021 EXPORT_SYMBOL(snd_pcm_hw_rule_add
);
1024 * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
1025 * @runtime: PCM runtime instance
1026 * @var: hw_params variable to apply the mask
1027 * @mask: the bitmap mask
1029 * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
1031 int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1034 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1035 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1036 *maskp
->bits
&= mask
;
1037 memset(maskp
->bits
+ 1, 0, (SNDRV_MASK_MAX
-32) / 8); /* clear rest */
1038 if (*maskp
->bits
== 0)
1044 * snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
1045 * @runtime: PCM runtime instance
1046 * @var: hw_params variable to apply the mask
1047 * @mask: the 64bit bitmap mask
1049 * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
1051 int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1054 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1055 struct snd_mask
*maskp
= constrs_mask(constrs
, var
);
1056 maskp
->bits
[0] &= (u_int32_t
)mask
;
1057 maskp
->bits
[1] &= (u_int32_t
)(mask
>> 32);
1058 memset(maskp
->bits
+ 2, 0, (SNDRV_MASK_MAX
-64) / 8); /* clear rest */
1059 if (! maskp
->bits
[0] && ! maskp
->bits
[1])
1065 * snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
1066 * @runtime: PCM runtime instance
1067 * @var: hw_params variable to apply the integer constraint
1069 * Apply the constraint of integer to an interval parameter.
1071 int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
)
1073 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1074 return snd_interval_setinteger(constrs_interval(constrs
, var
));
1077 EXPORT_SYMBOL(snd_pcm_hw_constraint_integer
);
1080 * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
1081 * @runtime: PCM runtime instance
1082 * @var: hw_params variable to apply the range
1083 * @min: the minimal value
1084 * @max: the maximal value
1086 * Apply the min/max range constraint to an interval parameter.
1088 int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime
*runtime
, snd_pcm_hw_param_t var
,
1089 unsigned int min
, unsigned int max
)
1091 struct snd_pcm_hw_constraints
*constrs
= &runtime
->hw_constraints
;
1092 struct snd_interval t
;
1095 t
.openmin
= t
.openmax
= 0;
1097 return snd_interval_refine(constrs_interval(constrs
, var
), &t
);
1100 EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax
);
1102 static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params
*params
,
1103 struct snd_pcm_hw_rule
*rule
)
1105 struct snd_pcm_hw_constraint_list
*list
= rule
->private;
1106 return snd_interval_list(hw_param_interval(params
, rule
->var
), list
->count
, list
->list
, list
->mask
);
1111 * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
1112 * @runtime: PCM runtime instance
1113 * @cond: condition bits
1114 * @var: hw_params variable to apply the list constraint
1117 * Apply the list of constraints to an interval parameter.
1119 int snd_pcm_hw_constraint_list(struct snd_pcm_runtime
*runtime
,
1121 snd_pcm_hw_param_t var
,
1122 struct snd_pcm_hw_constraint_list
*l
)
1124 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1125 snd_pcm_hw_rule_list
, l
,
1129 EXPORT_SYMBOL(snd_pcm_hw_constraint_list
);
1131 static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params
*params
,
1132 struct snd_pcm_hw_rule
*rule
)
1134 struct snd_pcm_hw_constraint_ratnums
*r
= rule
->private;
1135 unsigned int num
= 0, den
= 0;
1137 err
= snd_interval_ratnum(hw_param_interval(params
, rule
->var
),
1138 r
->nrats
, r
->rats
, &num
, &den
);
1139 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1140 params
->rate_num
= num
;
1141 params
->rate_den
= den
;
1147 * snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
1148 * @runtime: PCM runtime instance
1149 * @cond: condition bits
1150 * @var: hw_params variable to apply the ratnums constraint
1151 * @r: struct snd_ratnums constriants
1153 int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime
*runtime
,
1155 snd_pcm_hw_param_t var
,
1156 struct snd_pcm_hw_constraint_ratnums
*r
)
1158 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1159 snd_pcm_hw_rule_ratnums
, r
,
1163 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums
);
1165 static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params
*params
,
1166 struct snd_pcm_hw_rule
*rule
)
1168 struct snd_pcm_hw_constraint_ratdens
*r
= rule
->private;
1169 unsigned int num
= 0, den
= 0;
1170 int err
= snd_interval_ratden(hw_param_interval(params
, rule
->var
),
1171 r
->nrats
, r
->rats
, &num
, &den
);
1172 if (err
>= 0 && den
&& rule
->var
== SNDRV_PCM_HW_PARAM_RATE
) {
1173 params
->rate_num
= num
;
1174 params
->rate_den
= den
;
1180 * snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
1181 * @runtime: PCM runtime instance
1182 * @cond: condition bits
1183 * @var: hw_params variable to apply the ratdens constraint
1184 * @r: struct snd_ratdens constriants
1186 int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime
*runtime
,
1188 snd_pcm_hw_param_t var
,
1189 struct snd_pcm_hw_constraint_ratdens
*r
)
1191 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1192 snd_pcm_hw_rule_ratdens
, r
,
1196 EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens
);
1198 static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params
*params
,
1199 struct snd_pcm_hw_rule
*rule
)
1201 unsigned int l
= (unsigned long) rule
->private;
1202 int width
= l
& 0xffff;
1203 unsigned int msbits
= l
>> 16;
1204 struct snd_interval
*i
= hw_param_interval(params
, SNDRV_PCM_HW_PARAM_SAMPLE_BITS
);
1205 if (snd_interval_single(i
) && snd_interval_value(i
) == width
)
1206 params
->msbits
= msbits
;
1211 * snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
1212 * @runtime: PCM runtime instance
1213 * @cond: condition bits
1214 * @width: sample bits width
1215 * @msbits: msbits width
1217 int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime
*runtime
,
1220 unsigned int msbits
)
1222 unsigned long l
= (msbits
<< 16) | width
;
1223 return snd_pcm_hw_rule_add(runtime
, cond
, -1,
1224 snd_pcm_hw_rule_msbits
,
1226 SNDRV_PCM_HW_PARAM_SAMPLE_BITS
, -1);
1229 EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits
);
1231 static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params
*params
,
1232 struct snd_pcm_hw_rule
*rule
)
1234 unsigned long step
= (unsigned long) rule
->private;
1235 return snd_interval_step(hw_param_interval(params
, rule
->var
), 0, step
);
1239 * snd_pcm_hw_constraint_step - add a hw constraint step rule
1240 * @runtime: PCM runtime instance
1241 * @cond: condition bits
1242 * @var: hw_params variable to apply the step constraint
1245 int snd_pcm_hw_constraint_step(struct snd_pcm_runtime
*runtime
,
1247 snd_pcm_hw_param_t var
,
1250 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1251 snd_pcm_hw_rule_step
, (void *) step
,
1255 EXPORT_SYMBOL(snd_pcm_hw_constraint_step
);
1257 static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params
*params
, struct snd_pcm_hw_rule
*rule
)
1259 static unsigned int pow2_sizes
[] = {
1260 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
1261 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
1262 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
1263 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
1265 return snd_interval_list(hw_param_interval(params
, rule
->var
),
1266 ARRAY_SIZE(pow2_sizes
), pow2_sizes
, 0);
1270 * snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
1271 * @runtime: PCM runtime instance
1272 * @cond: condition bits
1273 * @var: hw_params variable to apply the power-of-2 constraint
1275 int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime
*runtime
,
1277 snd_pcm_hw_param_t var
)
1279 return snd_pcm_hw_rule_add(runtime
, cond
, var
,
1280 snd_pcm_hw_rule_pow2
, NULL
,
1284 EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2
);
1286 static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params
*params
,
1287 snd_pcm_hw_param_t var
)
1289 if (hw_is_mask(var
)) {
1290 snd_mask_any(hw_param_mask(params
, var
));
1291 params
->cmask
|= 1 << var
;
1292 params
->rmask
|= 1 << var
;
1295 if (hw_is_interval(var
)) {
1296 snd_interval_any(hw_param_interval(params
, var
));
1297 params
->cmask
|= 1 << var
;
1298 params
->rmask
|= 1 << var
;
1304 void _snd_pcm_hw_params_any(struct snd_pcm_hw_params
*params
)
1307 memset(params
, 0, sizeof(*params
));
1308 for (k
= SNDRV_PCM_HW_PARAM_FIRST_MASK
; k
<= SNDRV_PCM_HW_PARAM_LAST_MASK
; k
++)
1309 _snd_pcm_hw_param_any(params
, k
);
1310 for (k
= SNDRV_PCM_HW_PARAM_FIRST_INTERVAL
; k
<= SNDRV_PCM_HW_PARAM_LAST_INTERVAL
; k
++)
1311 _snd_pcm_hw_param_any(params
, k
);
1315 EXPORT_SYMBOL(_snd_pcm_hw_params_any
);
1318 * snd_pcm_hw_param_value - return @params field @var value
1319 * @params: the hw_params instance
1320 * @var: parameter to retrieve
1321 * @dir: pointer to the direction (-1,0,1) or %NULL
1323 * Return the value for field @var if it's fixed in configuration space
1324 * defined by @params. Return -%EINVAL otherwise.
1326 int snd_pcm_hw_param_value(const struct snd_pcm_hw_params
*params
,
1327 snd_pcm_hw_param_t var
, int *dir
)
1329 if (hw_is_mask(var
)) {
1330 const struct snd_mask
*mask
= hw_param_mask_c(params
, var
);
1331 if (!snd_mask_single(mask
))
1335 return snd_mask_value(mask
);
1337 if (hw_is_interval(var
)) {
1338 const struct snd_interval
*i
= hw_param_interval_c(params
, var
);
1339 if (!snd_interval_single(i
))
1343 return snd_interval_value(i
);
1348 EXPORT_SYMBOL(snd_pcm_hw_param_value
);
1350 void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params
*params
,
1351 snd_pcm_hw_param_t var
)
1353 if (hw_is_mask(var
)) {
1354 snd_mask_none(hw_param_mask(params
, var
));
1355 params
->cmask
|= 1 << var
;
1356 params
->rmask
|= 1 << var
;
1357 } else if (hw_is_interval(var
)) {
1358 snd_interval_none(hw_param_interval(params
, var
));
1359 params
->cmask
|= 1 << var
;
1360 params
->rmask
|= 1 << var
;
1366 EXPORT_SYMBOL(_snd_pcm_hw_param_setempty
);
1368 static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params
*params
,
1369 snd_pcm_hw_param_t var
)
1372 if (hw_is_mask(var
))
1373 changed
= snd_mask_refine_first(hw_param_mask(params
, var
));
1374 else if (hw_is_interval(var
))
1375 changed
= snd_interval_refine_first(hw_param_interval(params
, var
));
1379 params
->cmask
|= 1 << var
;
1380 params
->rmask
|= 1 << var
;
1387 * snd_pcm_hw_param_first - refine config space and return minimum value
1388 * @pcm: PCM instance
1389 * @params: the hw_params instance
1390 * @var: parameter to retrieve
1391 * @dir: pointer to the direction (-1,0,1) or %NULL
1393 * Inside configuration space defined by @params remove from @var all
1394 * values > minimum. Reduce configuration space accordingly.
1395 * Return the minimum.
1397 int snd_pcm_hw_param_first(struct snd_pcm_substream
*pcm
,
1398 struct snd_pcm_hw_params
*params
,
1399 snd_pcm_hw_param_t var
, int *dir
)
1401 int changed
= _snd_pcm_hw_param_first(params
, var
);
1404 if (params
->rmask
) {
1405 int err
= snd_pcm_hw_refine(pcm
, params
);
1406 if (snd_BUG_ON(err
< 0))
1409 return snd_pcm_hw_param_value(params
, var
, dir
);
1412 EXPORT_SYMBOL(snd_pcm_hw_param_first
);
1414 static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params
*params
,
1415 snd_pcm_hw_param_t var
)
1418 if (hw_is_mask(var
))
1419 changed
= snd_mask_refine_last(hw_param_mask(params
, var
));
1420 else if (hw_is_interval(var
))
1421 changed
= snd_interval_refine_last(hw_param_interval(params
, var
));
1425 params
->cmask
|= 1 << var
;
1426 params
->rmask
|= 1 << var
;
1433 * snd_pcm_hw_param_last - refine config space and return maximum value
1434 * @pcm: PCM instance
1435 * @params: the hw_params instance
1436 * @var: parameter to retrieve
1437 * @dir: pointer to the direction (-1,0,1) or %NULL
1439 * Inside configuration space defined by @params remove from @var all
1440 * values < maximum. Reduce configuration space accordingly.
1441 * Return the maximum.
1443 int snd_pcm_hw_param_last(struct snd_pcm_substream
*pcm
,
1444 struct snd_pcm_hw_params
*params
,
1445 snd_pcm_hw_param_t var
, int *dir
)
1447 int changed
= _snd_pcm_hw_param_last(params
, var
);
1450 if (params
->rmask
) {
1451 int err
= snd_pcm_hw_refine(pcm
, params
);
1452 if (snd_BUG_ON(err
< 0))
1455 return snd_pcm_hw_param_value(params
, var
, dir
);
1458 EXPORT_SYMBOL(snd_pcm_hw_param_last
);
1461 * snd_pcm_hw_param_choose - choose a configuration defined by @params
1462 * @pcm: PCM instance
1463 * @params: the hw_params instance
1465 * Choose one configuration from configuration space defined by @params.
1466 * The configuration chosen is that obtained fixing in this order:
1467 * first access, first format, first subformat, min channels,
1468 * min rate, min period time, max buffer size, min tick time
1470 int snd_pcm_hw_params_choose(struct snd_pcm_substream
*pcm
,
1471 struct snd_pcm_hw_params
*params
)
1473 static int vars
[] = {
1474 SNDRV_PCM_HW_PARAM_ACCESS
,
1475 SNDRV_PCM_HW_PARAM_FORMAT
,
1476 SNDRV_PCM_HW_PARAM_SUBFORMAT
,
1477 SNDRV_PCM_HW_PARAM_CHANNELS
,
1478 SNDRV_PCM_HW_PARAM_RATE
,
1479 SNDRV_PCM_HW_PARAM_PERIOD_TIME
,
1480 SNDRV_PCM_HW_PARAM_BUFFER_SIZE
,
1481 SNDRV_PCM_HW_PARAM_TICK_TIME
,
1486 for (v
= vars
; *v
!= -1; v
++) {
1487 if (*v
!= SNDRV_PCM_HW_PARAM_BUFFER_SIZE
)
1488 err
= snd_pcm_hw_param_first(pcm
, params
, *v
, NULL
);
1490 err
= snd_pcm_hw_param_last(pcm
, params
, *v
, NULL
);
1491 if (snd_BUG_ON(err
< 0))
1497 static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream
*substream
,
1500 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1501 unsigned long flags
;
1502 snd_pcm_stream_lock_irqsave(substream
, flags
);
1503 if (snd_pcm_running(substream
) &&
1504 snd_pcm_update_hw_ptr(substream
) >= 0)
1505 runtime
->status
->hw_ptr
%= runtime
->buffer_size
;
1507 runtime
->status
->hw_ptr
= 0;
1508 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1512 static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream
*substream
,
1515 struct snd_pcm_channel_info
*info
= arg
;
1516 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1518 if (!(runtime
->info
& SNDRV_PCM_INFO_MMAP
)) {
1522 width
= snd_pcm_format_physical_width(runtime
->format
);
1526 switch (runtime
->access
) {
1527 case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED
:
1528 case SNDRV_PCM_ACCESS_RW_INTERLEAVED
:
1529 info
->first
= info
->channel
* width
;
1530 info
->step
= runtime
->channels
* width
;
1532 case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED
:
1533 case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
:
1535 size_t size
= runtime
->dma_bytes
/ runtime
->channels
;
1536 info
->first
= info
->channel
* size
* 8;
1547 static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream
*substream
,
1550 struct snd_pcm_hw_params
*params
= arg
;
1551 snd_pcm_format_t format
;
1552 int channels
, width
;
1554 params
->fifo_size
= substream
->runtime
->hw
.fifo_size
;
1555 if (!(substream
->runtime
->hw
.info
& SNDRV_PCM_INFO_FIFO_IN_FRAMES
)) {
1556 format
= params_format(params
);
1557 channels
= params_channels(params
);
1558 width
= snd_pcm_format_physical_width(format
);
1559 params
->fifo_size
/= width
* channels
;
1565 * snd_pcm_lib_ioctl - a generic PCM ioctl callback
1566 * @substream: the pcm substream instance
1567 * @cmd: ioctl command
1568 * @arg: ioctl argument
1570 * Processes the generic ioctl commands for PCM.
1571 * Can be passed as the ioctl callback for PCM ops.
1573 * Returns zero if successful, or a negative error code on failure.
1575 int snd_pcm_lib_ioctl(struct snd_pcm_substream
*substream
,
1576 unsigned int cmd
, void *arg
)
1579 case SNDRV_PCM_IOCTL1_INFO
:
1581 case SNDRV_PCM_IOCTL1_RESET
:
1582 return snd_pcm_lib_ioctl_reset(substream
, arg
);
1583 case SNDRV_PCM_IOCTL1_CHANNEL_INFO
:
1584 return snd_pcm_lib_ioctl_channel_info(substream
, arg
);
1585 case SNDRV_PCM_IOCTL1_FIFO_SIZE
:
1586 return snd_pcm_lib_ioctl_fifo_size(substream
, arg
);
1591 EXPORT_SYMBOL(snd_pcm_lib_ioctl
);
1594 * snd_pcm_period_elapsed - update the pcm status for the next period
1595 * @substream: the pcm substream instance
1597 * This function is called from the interrupt handler when the
1598 * PCM has processed the period size. It will update the current
1599 * pointer, wake up sleepers, etc.
1601 * Even if more than one periods have elapsed since the last call, you
1602 * have to call this only once.
1604 void snd_pcm_period_elapsed(struct snd_pcm_substream
*substream
)
1606 struct snd_pcm_runtime
*runtime
;
1607 unsigned long flags
;
1609 if (PCM_RUNTIME_CHECK(substream
))
1611 runtime
= substream
->runtime
;
1613 if (runtime
->transfer_ack_begin
)
1614 runtime
->transfer_ack_begin(substream
);
1616 snd_pcm_stream_lock_irqsave(substream
, flags
);
1617 if (!snd_pcm_running(substream
) ||
1618 snd_pcm_update_hw_ptr_interrupt(substream
) < 0)
1621 if (substream
->timer_running
)
1622 snd_timer_interrupt(substream
->timer
, 1);
1624 snd_pcm_stream_unlock_irqrestore(substream
, flags
);
1625 if (runtime
->transfer_ack_end
)
1626 runtime
->transfer_ack_end(substream
);
1627 kill_fasync(&runtime
->fasync
, SIGIO
, POLL_IN
);
1630 EXPORT_SYMBOL(snd_pcm_period_elapsed
);
1633 * Wait until avail_min data becomes available
1634 * Returns a negative error code if any error occurs during operation.
1635 * The available space is stored on availp. When err = 0 and avail = 0
1636 * on the capture stream, it indicates the stream is in DRAINING state.
1638 static int wait_for_avail_min(struct snd_pcm_substream
*substream
,
1639 snd_pcm_uframes_t
*availp
)
1641 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1642 int is_playback
= substream
->stream
== SNDRV_PCM_STREAM_PLAYBACK
;
1645 snd_pcm_uframes_t avail
= 0;
1648 init_waitqueue_entry(&wait
, current
);
1649 add_wait_queue(&runtime
->sleep
, &wait
);
1651 if (signal_pending(current
)) {
1655 set_current_state(TASK_INTERRUPTIBLE
);
1656 snd_pcm_stream_unlock_irq(substream
);
1657 tout
= schedule_timeout(msecs_to_jiffies(10000));
1658 snd_pcm_stream_lock_irq(substream
);
1659 switch (runtime
->status
->state
) {
1660 case SNDRV_PCM_STATE_SUSPENDED
:
1663 case SNDRV_PCM_STATE_XRUN
:
1666 case SNDRV_PCM_STATE_DRAINING
:
1670 avail
= 0; /* indicate draining */
1672 case SNDRV_PCM_STATE_OPEN
:
1673 case SNDRV_PCM_STATE_SETUP
:
1674 case SNDRV_PCM_STATE_DISCONNECTED
:
1679 snd_printd("%s write error (DMA or IRQ trouble?)\n",
1680 is_playback
? "playback" : "capture");
1685 avail
= snd_pcm_playback_avail(runtime
);
1687 avail
= snd_pcm_capture_avail(runtime
);
1688 if (avail
>= runtime
->control
->avail_min
)
1692 remove_wait_queue(&runtime
->sleep
, &wait
);
1697 static int snd_pcm_lib_write_transfer(struct snd_pcm_substream
*substream
,
1699 unsigned long data
, unsigned int off
,
1700 snd_pcm_uframes_t frames
)
1702 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1704 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1705 if (substream
->ops
->copy
) {
1706 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1709 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1710 if (copy_from_user(hwbuf
, buf
, frames_to_bytes(runtime
, frames
)))
1716 typedef int (*transfer_f
)(struct snd_pcm_substream
*substream
, unsigned int hwoff
,
1717 unsigned long data
, unsigned int off
,
1718 snd_pcm_uframes_t size
);
1720 static snd_pcm_sframes_t
snd_pcm_lib_write1(struct snd_pcm_substream
*substream
,
1722 snd_pcm_uframes_t size
,
1724 transfer_f transfer
)
1726 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1727 snd_pcm_uframes_t xfer
= 0;
1728 snd_pcm_uframes_t offset
= 0;
1734 snd_pcm_stream_lock_irq(substream
);
1735 switch (runtime
->status
->state
) {
1736 case SNDRV_PCM_STATE_PREPARED
:
1737 case SNDRV_PCM_STATE_RUNNING
:
1738 case SNDRV_PCM_STATE_PAUSED
:
1740 case SNDRV_PCM_STATE_XRUN
:
1743 case SNDRV_PCM_STATE_SUSPENDED
:
1752 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1753 snd_pcm_uframes_t avail
;
1754 snd_pcm_uframes_t cont
;
1755 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1756 snd_pcm_update_hw_ptr(substream
);
1757 avail
= snd_pcm_playback_avail(runtime
);
1763 err
= wait_for_avail_min(substream
, &avail
);
1767 frames
= size
> avail
? avail
: size
;
1768 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
1771 if (snd_BUG_ON(!frames
)) {
1772 snd_pcm_stream_unlock_irq(substream
);
1775 appl_ptr
= runtime
->control
->appl_ptr
;
1776 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
1777 snd_pcm_stream_unlock_irq(substream
);
1778 if ((err
= transfer(substream
, appl_ofs
, data
, offset
, frames
)) < 0)
1780 snd_pcm_stream_lock_irq(substream
);
1781 switch (runtime
->status
->state
) {
1782 case SNDRV_PCM_STATE_XRUN
:
1785 case SNDRV_PCM_STATE_SUSPENDED
:
1792 if (appl_ptr
>= runtime
->boundary
)
1793 appl_ptr
-= runtime
->boundary
;
1794 runtime
->control
->appl_ptr
= appl_ptr
;
1795 if (substream
->ops
->ack
)
1796 substream
->ops
->ack(substream
);
1801 if (runtime
->status
->state
== SNDRV_PCM_STATE_PREPARED
&&
1802 snd_pcm_playback_hw_avail(runtime
) >= (snd_pcm_sframes_t
)runtime
->start_threshold
) {
1803 err
= snd_pcm_start(substream
);
1809 snd_pcm_stream_unlock_irq(substream
);
1811 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
1814 /* sanity-check for read/write methods */
1815 static int pcm_sanity_check(struct snd_pcm_substream
*substream
)
1817 struct snd_pcm_runtime
*runtime
;
1818 if (PCM_RUNTIME_CHECK(substream
))
1820 runtime
= substream
->runtime
;
1821 if (snd_BUG_ON(!substream
->ops
->copy
&& !runtime
->dma_area
))
1823 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
1828 snd_pcm_sframes_t
snd_pcm_lib_write(struct snd_pcm_substream
*substream
, const void __user
*buf
, snd_pcm_uframes_t size
)
1830 struct snd_pcm_runtime
*runtime
;
1834 err
= pcm_sanity_check(substream
);
1837 runtime
= substream
->runtime
;
1838 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1840 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
&&
1841 runtime
->channels
> 1)
1843 return snd_pcm_lib_write1(substream
, (unsigned long)buf
, size
, nonblock
,
1844 snd_pcm_lib_write_transfer
);
1847 EXPORT_SYMBOL(snd_pcm_lib_write
);
1849 static int snd_pcm_lib_writev_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 void __user
**bufs
= (void __user
**)data
;
1857 int channels
= runtime
->channels
;
1859 if (substream
->ops
->copy
) {
1860 if (snd_BUG_ON(!substream
->ops
->silence
))
1862 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1863 if (*bufs
== NULL
) {
1864 if ((err
= substream
->ops
->silence(substream
, c
, hwoff
, frames
)) < 0)
1867 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1868 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
1873 /* default transfer behaviour */
1874 size_t dma_csize
= runtime
->dma_bytes
/ channels
;
1875 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
1876 char *hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
1877 if (*bufs
== NULL
) {
1878 snd_pcm_format_set_silence(runtime
->format
, hwbuf
, frames
);
1880 char __user
*buf
= *bufs
+ samples_to_bytes(runtime
, off
);
1881 if (copy_from_user(hwbuf
, buf
, samples_to_bytes(runtime
, frames
)))
1889 snd_pcm_sframes_t
snd_pcm_lib_writev(struct snd_pcm_substream
*substream
,
1891 snd_pcm_uframes_t frames
)
1893 struct snd_pcm_runtime
*runtime
;
1897 err
= pcm_sanity_check(substream
);
1900 runtime
= substream
->runtime
;
1901 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
1903 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
1905 return snd_pcm_lib_write1(substream
, (unsigned long)bufs
, frames
,
1906 nonblock
, snd_pcm_lib_writev_transfer
);
1909 EXPORT_SYMBOL(snd_pcm_lib_writev
);
1911 static int snd_pcm_lib_read_transfer(struct snd_pcm_substream
*substream
,
1913 unsigned long data
, unsigned int off
,
1914 snd_pcm_uframes_t frames
)
1916 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1918 char __user
*buf
= (char __user
*) data
+ frames_to_bytes(runtime
, off
);
1919 if (substream
->ops
->copy
) {
1920 if ((err
= substream
->ops
->copy(substream
, -1, hwoff
, buf
, frames
)) < 0)
1923 char *hwbuf
= runtime
->dma_area
+ frames_to_bytes(runtime
, hwoff
);
1924 if (copy_to_user(buf
, hwbuf
, frames_to_bytes(runtime
, frames
)))
1930 static snd_pcm_sframes_t
snd_pcm_lib_read1(struct snd_pcm_substream
*substream
,
1932 snd_pcm_uframes_t size
,
1934 transfer_f transfer
)
1936 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
1937 snd_pcm_uframes_t xfer
= 0;
1938 snd_pcm_uframes_t offset
= 0;
1944 snd_pcm_stream_lock_irq(substream
);
1945 switch (runtime
->status
->state
) {
1946 case SNDRV_PCM_STATE_PREPARED
:
1947 if (size
>= runtime
->start_threshold
) {
1948 err
= snd_pcm_start(substream
);
1953 case SNDRV_PCM_STATE_DRAINING
:
1954 case SNDRV_PCM_STATE_RUNNING
:
1955 case SNDRV_PCM_STATE_PAUSED
:
1957 case SNDRV_PCM_STATE_XRUN
:
1960 case SNDRV_PCM_STATE_SUSPENDED
:
1969 snd_pcm_uframes_t frames
, appl_ptr
, appl_ofs
;
1970 snd_pcm_uframes_t avail
;
1971 snd_pcm_uframes_t cont
;
1972 if (runtime
->status
->state
== SNDRV_PCM_STATE_RUNNING
)
1973 snd_pcm_update_hw_ptr(substream
);
1974 avail
= snd_pcm_capture_avail(runtime
);
1976 if (runtime
->status
->state
==
1977 SNDRV_PCM_STATE_DRAINING
) {
1978 snd_pcm_stop(substream
, SNDRV_PCM_STATE_SETUP
);
1985 err
= wait_for_avail_min(substream
, &avail
);
1989 continue; /* draining */
1991 frames
= size
> avail
? avail
: size
;
1992 cont
= runtime
->buffer_size
- runtime
->control
->appl_ptr
% runtime
->buffer_size
;
1995 if (snd_BUG_ON(!frames
)) {
1996 snd_pcm_stream_unlock_irq(substream
);
1999 appl_ptr
= runtime
->control
->appl_ptr
;
2000 appl_ofs
= appl_ptr
% runtime
->buffer_size
;
2001 snd_pcm_stream_unlock_irq(substream
);
2002 if ((err
= transfer(substream
, appl_ofs
, data
, offset
, frames
)) < 0)
2004 snd_pcm_stream_lock_irq(substream
);
2005 switch (runtime
->status
->state
) {
2006 case SNDRV_PCM_STATE_XRUN
:
2009 case SNDRV_PCM_STATE_SUSPENDED
:
2016 if (appl_ptr
>= runtime
->boundary
)
2017 appl_ptr
-= runtime
->boundary
;
2018 runtime
->control
->appl_ptr
= appl_ptr
;
2019 if (substream
->ops
->ack
)
2020 substream
->ops
->ack(substream
);
2027 snd_pcm_stream_unlock_irq(substream
);
2029 return xfer
> 0 ? (snd_pcm_sframes_t
)xfer
: err
;
2032 snd_pcm_sframes_t
snd_pcm_lib_read(struct snd_pcm_substream
*substream
, void __user
*buf
, snd_pcm_uframes_t size
)
2034 struct snd_pcm_runtime
*runtime
;
2038 err
= pcm_sanity_check(substream
);
2041 runtime
= substream
->runtime
;
2042 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2043 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_INTERLEAVED
)
2045 return snd_pcm_lib_read1(substream
, (unsigned long)buf
, size
, nonblock
, snd_pcm_lib_read_transfer
);
2048 EXPORT_SYMBOL(snd_pcm_lib_read
);
2050 static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream
*substream
,
2052 unsigned long data
, unsigned int off
,
2053 snd_pcm_uframes_t frames
)
2055 struct snd_pcm_runtime
*runtime
= substream
->runtime
;
2057 void __user
**bufs
= (void __user
**)data
;
2058 int channels
= runtime
->channels
;
2060 if (substream
->ops
->copy
) {
2061 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2065 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2066 if ((err
= substream
->ops
->copy(substream
, c
, hwoff
, buf
, frames
)) < 0)
2070 snd_pcm_uframes_t dma_csize
= runtime
->dma_bytes
/ channels
;
2071 for (c
= 0; c
< channels
; ++c
, ++bufs
) {
2077 hwbuf
= runtime
->dma_area
+ (c
* dma_csize
) + samples_to_bytes(runtime
, hwoff
);
2078 buf
= *bufs
+ samples_to_bytes(runtime
, off
);
2079 if (copy_to_user(buf
, hwbuf
, samples_to_bytes(runtime
, frames
)))
2086 snd_pcm_sframes_t
snd_pcm_lib_readv(struct snd_pcm_substream
*substream
,
2088 snd_pcm_uframes_t frames
)
2090 struct snd_pcm_runtime
*runtime
;
2094 err
= pcm_sanity_check(substream
);
2097 runtime
= substream
->runtime
;
2098 if (runtime
->status
->state
== SNDRV_PCM_STATE_OPEN
)
2101 nonblock
= !!(substream
->f_flags
& O_NONBLOCK
);
2102 if (runtime
->access
!= SNDRV_PCM_ACCESS_RW_NONINTERLEAVED
)
2104 return snd_pcm_lib_read1(substream
, (unsigned long)bufs
, frames
, nonblock
, snd_pcm_lib_readv_transfer
);
2107 EXPORT_SYMBOL(snd_pcm_lib_readv
);